Display device and electronic equipment

Abstract

A display device including two overlapping display panels. The upper display panel includes a first display area and an area that allows visible light to pass through. The lower display panel includes a second display area and an area that blocks visible light. The second display area overlaps with the area that allows visible light to pass through. The area that blocks visible light overlaps with the first display area. The lower display panel includes a third display area between the second display area and the area that blocks visible light. The gate signal and the source signal supplied to the first pixel included in the third display area are equal to the gate signal and the source signal supplied to the second pixel included in the second display area. Compared with other pixels included in the second display area, the second pixel is closer to the first pixel.

Description

[0001] This application is a divisional application of an application filed on August 26, 2016, with PCT application number PCT / IB2016 / 055096, which entered the Chinese national phase on March 2, 2018, with national application number 201680050775.7, and with the invention name “Display device and electronic device”. Technical Field

[0002] One embodiment of the present invention relates to a display device including a plurality of display panels.

[0003] Note that one embodiment of the present invention is not limited to the aforementioned technical field. Examples of the technical fields of one embodiment of the present invention include semiconductor devices, display devices, light-emitting devices, power storage devices, storage devices, electronic devices, lighting devices, input devices (e.g., touch sensors), input / output devices (e.g., touch panels), and methods for driving or manufacturing the same. Background Art

[0004] In recent years, there has been a demand for larger display devices. Examples of large display devices include home televisions (also known as televisions or television receivers), digital signage, and public information displays (PIDs). Displays with large display areas can provide more information at once. Furthermore, a large display area is more likely to attract attention, leading to improved advertising effectiveness, for example.

[0005] Light-emitting elements (also referred to as "EL elements") that utilize the electroluminescence (EL) phenomenon are readily thinner and lighter, can respond quickly to input signals, and can be driven using, for example, a low-voltage DC power supply. These elements are expected to be used in display devices. For example, Patent Document 1 discloses a flexible light-emitting device utilizing an organic EL element.

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2014-197522 Summary of the Invention

[0007] One purpose of one embodiment of the present invention is to increase the size of a display device. Another purpose of one embodiment of the present invention is to provide a display device with a large display area in which seams are not easily discernible. Another purpose of one embodiment of the present invention is to provide a display device with a high overview. Another purpose of one embodiment of the present invention is to reduce the thickness or weight of a display device. Another purpose of one embodiment of the present invention is to provide a display device capable of displaying along a curved surface. Another purpose of one embodiment of the present invention is to provide a display device with high reliability.

[0008] Note that the inclusion of these objectives does not preclude the existence of other objectives. Furthermore, one embodiment of the present invention does not necessarily achieve all of the aforementioned objectives. Furthermore, objectives other than the aforementioned objectives may be extracted from the description of the specification, drawings, and claims.

[0009] A display device according to one embodiment of the present invention includes a first display panel and a second display panel. The first display panel includes a first display area and an area that transmits visible light. The second display panel includes a second display area, a third display area, and an area that blocks visible light. The first display area is adjacent to the area that transmits visible light. The third display area is located between the second display area and the area that blocks visible light and is adjacent to the second display area and the area that blocks visible light. The second display area overlaps with the area that transmits visible light on the side of the display surface. The area that blocks visible light overlaps with the first display area. At least one of the first display area and the area that transmits visible light overlaps with the third display area. The second display area includes a plurality of pixels arranged in m rows and n columns (m and n are each independently an integer greater than or equal to 2). The third display area includes a plurality of pixels arranged in the column direction. The third display area is adjacent to the pixels in the nth column included in the second display area. The gate signals and source signals supplied to the pixels in the i-th row (i is an integer greater than or equal to 1 and less than or equal to m) included in the third display area are equal to the gate signals and source signals supplied to the pixels in the i-th row and n-th column included in the second display area.

[0010] In the above structure, preferably, the pixel in the i-th row and n-th column of the second display area includes a first light-emitting element and a first driving transistor, and the pixel in the i-th row of the third display area includes a second light-emitting element and a second driving transistor. The source or drain of the first driving transistor is electrically connected to the first light-emitting element. The source or drain of the second driving transistor is electrically connected to the second light-emitting element.

[0011] The area of ​​the second light-emitting element is preferably larger than that of the first light-emitting element. In this case, the ratio W / L of the channel length (L) to the channel width (W) of the second drive transistor is preferably larger than W / L of the first drive transistor.

[0012] Preferably, the first driving transistor is a single-gate transistor, and the second driving transistor is a double-gate transistor.

[0013] Preferably, the second display panel includes a plurality of source lines, and the source lines in the (n+1)th column and thereafter are connected to the source line in the (n)th column.

[0014] In addition, in the above structure, preferably, the pixels in the i-th row and n-th column included in the second display area include a first light-emitting element, a first driving transistor and a selection transistor, the pixels in the i-th row included in the third display area include a second light-emitting element and a second driving transistor, the source or drain of the first driving transistor is electrically connected to the first light-emitting element, the source or drain of the second driving transistor is electrically connected to the second light-emitting element, and the source or drain of the selection transistor is electrically connected to the gate of the first driving transistor and the gate of the second driving transistor.

[0015] In addition, in the above structure, preferably, the pixel in the i-th row and n-th column included in the second display area includes a first light-emitting element, a first driving transistor and a selection transistor, the pixel in the i-th row included in the third display area includes a second light-emitting element, the source or drain of the first driving transistor is electrically connected to the pixel electrode of the first light-emitting element and the pixel electrode of the second light-emitting element, and the source or drain of the selection transistor is electrically connected to the gate of the first driving transistor.

[0016] The color of the pixels in the i-th row included in the third display area is preferably the same as the color of the pixels in the i-th row and n-th column included in the second display area.

[0017] In addition, preferably, the third display area includes a plurality of pixels arranged in a row direction, the third display area is adjacent to the pixels of the mth row included in the second display area, and the gate signal and the source signal supplied to the pixels of the jth column (j is an integer greater than 1 and less than n) included in the third display area are equal to the gate signal and the source signal supplied to the pixels of the mth row and jth column included in the second display area.

[0018] In the above structure, preferably, the pixel in the mth row and jth column of the second display area includes a third light-emitting element and a third driving transistor, and the pixel in the jth column of the third display area includes a fourth light-emitting element and a fourth driving transistor. The source or drain of the third driving transistor is electrically connected to the third light-emitting element. The source or drain of the fourth driving transistor is electrically connected to the fourth light-emitting element.

[0019] The area of ​​the fourth light-emitting element is preferably larger than that of the third light-emitting element. In this case, the W / L ratio of the fourth driving transistor is preferably larger than that of the third driving transistor.

[0020] Preferably, the third driving transistor is a single-gate transistor, and the fourth driving transistor is a double-gate transistor.

[0021] Preferably, the second display panel includes a plurality of gate lines, and the gate lines in the (m+1)th row and thereafter are connected to the gate line in the (m)th row.

[0022] In the above structure, preferably, the pixel in the mth row and jth column included in the second display area includes a third light-emitting element, a third driving transistor and a selection transistor, the pixel in the jth column included in the third display area includes a fourth light-emitting element and a fourth driving transistor, the source or drain of the third driving transistor is electrically connected to the third light-emitting element, the source or drain of the fourth driving transistor is electrically connected to the fourth light-emitting element, and the source or drain of the selection transistor is electrically connected to the gate of the third driving transistor and the gate of the fourth driving transistor.

[0023] In the above structure, preferably, the pixel in the mth row and jth column included in the second display area includes a third light-emitting element, a selection transistor and a third driving transistor, the pixel in the jth column included in the third display area includes a fourth light-emitting element, the source or drain of the third driving transistor is electrically connected to the pixel electrode of the third light-emitting element and the pixel electrode of the fourth light-emitting element, and the source or drain of the selection transistor is electrically connected to the gate of the third driving transistor.

[0024] The color of the pixels in the j-th column included in the third display area is preferably the same as the color of the pixels in the m-th row and j-th column included in the second display area.

[0025] Preferably, the second display area and the third display area include pixels with a total of m+x rows and n+y columns (x and y are independently integers greater than 1), and the gate signals and source signals supplied to the pixels after the m+1th row and after the n+1th column are equal to the gate signals and source signals supplied to the pixels in the mth row and nth column.

[0026] The area of ​​the light-emitting element included in the pixel in the m+1th row and n+1th column is preferably larger than the area of ​​the light-emitting element included in the pixel in the mth row and nth column. In this case, the W / L ratio of the driving transistor included in the pixel in the m+1th row and n+1th column is preferably larger than the W / L ratio of the driving transistor included in the pixel in the mth row and nth column.

[0027] Preferably, the driving transistor included in the pixel in the mth row and the nth column is a single-gate transistor, and the driving transistor included in the pixel in the m+1th row and the n+1th column is a double-gate transistor.

[0028] The colors of the pixels in the (m+1)th row and later and the (n+1)th column and later are preferably the same as the color of the pixel in the (m)th row and the (n)th column.

[0029] A display device according to one embodiment of the present invention includes a first display panel and a second display panel. The first display panel includes a first display area and an area that transmits visible light. The second display panel includes a second display area and an area that blocks visible light. The first display area is adjacent to the area that transmits visible light. The second display area is adjacent to the area that blocks visible light. The second display area overlaps with the area that transmits visible light on the side of the display surface. The area that blocks visible light overlaps with the first display area. The second display area includes a plurality of pixels arranged in m rows and n columns (m and n are each independently an integer greater than 2). The area that blocks visible light is adjacent to the pixel in the nth column. The pixel in the i-th row and n-1th column includes a first light-emitting element and a first drive transistor. The pixel in the i-th row and n-1th column includes a second light-emitting element and a second drive transistor. The source or drain of the first drive transistor is electrically connected to the first light-emitting element. The source or drain of the second drive transistor is electrically connected to the second light-emitting element. The area of ​​the second light-emitting element is larger than that of the first light-emitting element.

[0030] The W / L of the second driving transistor is preferably greater than the W / L of the first driving transistor.

[0031] Preferably, the first driving transistor is a single-gate transistor, and the second driving transistor is a double-gate transistor.

[0032] Preferably, the area shielding visible light is adjacent to the pixels in the mth row of the second display area, and the area of ​​the light-emitting elements included in the pixels in the mth row and jth column (j is an integer greater than 1 and less than n) is greater than the area of ​​the light-emitting elements included in the pixels in the m-1th row and jth column.

[0033] The W / L ratio of the driving transistor included in the pixel at the m-th row and j-th column is preferably greater than the W / L ratio of the driving transistor included in the pixel at the m-1-th row and j-th column.

[0034] Preferably, the driving transistor included in the pixel in the m-1th row and the jth column is a single-gate transistor, and the driving transistor included in the pixel in the mth row and the jth column is a double-gate transistor.

[0035] One embodiment of the present invention is an electronic device including: any one of the above-described display devices; and at least one of an antenna, a battery, a housing, a camera, a speaker, a microphone, and an operation button.

[0036] According to one embodiment of the present invention, a display device can be enlarged. In addition, according to one embodiment of the present invention, a display device with a large display area in which seams are not easily discernible can be provided. In addition, according to one embodiment of the present invention, a display device with high visibility can be provided. In addition, according to one embodiment of the present invention, a display device can be made thinner or lighter. In addition, according to one embodiment of the present invention, a display device capable of displaying along a curved surface can be provided. In addition, according to one embodiment of the present invention, a display device with high reliability can be provided.

[0037] Note that the description of these effects does not preclude the existence of other effects. Furthermore, one embodiment of the present invention does not necessarily achieve all of the above effects. Furthermore, effects other than the above effects may be extracted from the description of the specification, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figures 1A to 1C is a top view showing an example of a display panel;

[0039] Figure 2A and Figure 2B is a top view showing an example of a display device;

[0040] Figure 3A and Figure 3B is a top view showing an example of a display device;

[0041] Figures 4A to 4C is a plan view showing an example of a display panel and a display device;

[0042] Figure 5A and Figure 5B is a plan view showing an example of a display panel and a display device;

[0043] Figures 6A to 6C is a top view showing an example of a display panel;

[0044] Figure 7A and Figure 7B is a top view showing an example of a display device;

[0045] Figure 8A and Figure 8B is a top view showing an example of a display device;

[0046] Figures 9A to 9C is a plan view showing an example of a display panel and a display device;

[0047] Figure 10A and Figure 10B is a plan view showing an example of a display panel and a display device;

[0048] Figure 11 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0049] Figure 12 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0050] Figure 13 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0051] Figure 14 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0052] Figure 15 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0053] 16A to 16D is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0054] Figure 17 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0055] Figure 18 is a circuit diagram showing an example of connection between a pixel and a driving circuit;

[0056] 19A to 19D is a circuit diagram showing an example of a pixel;

[0057] Figure 20A and Figure 20B is a top view showing an example of a pixel;

[0058] Figure 21A and Figure 21B is a top view showing an example of a pixel;

[0059] Figures 22A to 22E A diagram illustrating the arrangement of pixels and a diagram illustrating the arrangement of a display area of ​​a display element;

[0060] 23A to 23D A diagram illustrating the arrangement of pixels and a diagram illustrating the arrangement of a display area of ​​a display element;

[0061] Figure 24A and Figure 24B is a perspective view showing an example of a display device;

[0062] Figures 25A to 25C is a top view showing an example of a display device;

[0063] Figures 26A to 26E is a cross-sectional view showing an example of a display device;

[0064] 27A to 27D is a cross-sectional view showing an example of a display device;

[0065] 28A to 28D 1 is a plan view and a cross-sectional view showing an example of a display panel;

[0066] Figures 29A to 29C 1 is a plan view and a cross-sectional view showing an example of a display panel;

[0067] Figures 30A to 30C 1 is a plan view and a cross-sectional view showing an example of a display panel;

[0068] Figure 31 is a cross-sectional view showing an example of a display device;

[0069] Figures 32A to 32C is a cross-sectional view illustrating an example of a method for manufacturing a display panel;

[0070] Figure 33A and Figure 33B is a cross-sectional view illustrating an example of a method for manufacturing a display panel;

[0071] Figure 34A and Figure 34B is a cross-sectional view showing an example of a display panel;

[0072] Figure 35A and Figure 35B is a cross-sectional view showing an example of a display panel;

[0073] Figure 36A and Figure 36B is a perspective view showing an example of a touch panel;

[0074] Figure 37 is a cross-sectional view showing an example of a touch panel;

[0075] Figure 38A is a cross-sectional view showing an example of a touch panel, Figures 38B to 38D is a top view and a cross-sectional view of a transistor;

[0076] Figure 39 is a cross-sectional view showing an example of a touch panel;

[0077] Figure 40 is a cross-sectional view showing an example of a touch panel;

[0078] Figure 41 is a cross-sectional view showing an example of a touch panel;

[0079] Figure 42A and Figure 42B is a perspective view showing an example of a touch panel;

[0080] Figure 43 is a cross-sectional view showing an example of a touch panel;

[0081] Figure 44A and Figure 44B is a cross-sectional view showing an example of a touch panel;

[0082] Figures 45A to 45F 1 is a diagram showing an example of an electronic device and a lighting device;

[0083] Figure 46A1 、 Figure 46A2 、 Figures 46B to 46I is a diagram showing an example of an electronic device;

[0084] Figures 47A to 47C A diagram illustrating an example of use of a display device and an electronic device. DETAILED DESCRIPTION

[0085] The following describes the embodiments in detail with reference to the accompanying drawings. Note that the present invention is not limited to the following description. Those skilled in the art will readily appreciate that the embodiments and details can be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited solely to the embodiments described below.

[0086] Note that in the structures of the invention described below, the same reference numerals are used in common in different drawings to represent the same parts or parts having the same function, and repeated descriptions are omitted. In addition, when parts having the same function are represented, the same hatching is sometimes used without adding a special reference numeral.

[0087] In addition, for ease of understanding, the positions, sizes, and ranges of various components shown in the drawings may not necessarily represent their actual positions, sizes, and ranges. Therefore, the disclosed invention is not necessarily limited to the positions, sizes, and ranges disclosed in the drawings.

[0088] In addition, depending on the situation or state, the terms "film" and "layer" may be interchanged. For example, "conductive layer" may be replaced with "conductive film," or "insulating film" may be replaced with "insulating layer."

[0089] Implementation Method 1

[0090] In this embodiment, referring to Figures 1A to 27D A display device according to one embodiment of the present invention will be described.

[0091] By arranging a plurality of display panels in one or more directions (for example, in a column or in a matrix), a display device with a large display area can be manufactured.

[0092] When using multiple display panels to manufacture a large display device, the size of each display panel does not need to be large. Therefore, it is possible to avoid using large-scale manufacturing equipment to manufacture the display panels, thereby saving space. In addition, since manufacturing equipment for small and medium-sized display panels can be used, it is also possible to avoid the need for novel manufacturing equipment required to enlarge the display device, thereby reducing manufacturing costs. In addition, it is possible to suppress the decline in yield caused by the enlargement of display panels.

[0093] When the display panels have the same size, a display device including multiple display panels has a larger display area than a display device including one display panel, thereby having effects such as being able to display more information simultaneously.

[0094] However, each display panel includes a non-display area surrounding the display area. Therefore, for example, when the output images of the plurality of display panels are displayed as a single image, the user of the display device sees the single image as a divided image.

[0095] Although it is possible to prevent the displays of the display panels from being seen as separate by reducing the non-display area of ​​each display panel (using a display panel with a narrow frame), it is difficult to completely eliminate the non-display area of ​​the display panel.

[0096] Furthermore, when the non-display area of ​​the display panel is small, the distance between the end of the display panel and the elements within the display panel is short, and thus the elements may be easily degraded by impurities intruding from outside the display panel.

[0097] Therefore, in one embodiment of the present invention, a plurality of display panels are arranged in such a manner that parts of the display panels overlap with each other. In at least the display panel located on one side (upper side) of the display surface of the two overlapping display panels, the area that allows visible light to pass is adjacent to the display area. In one embodiment of the present invention, the display area of ​​the display panel arranged on the lower side overlaps with the area that allows visible light to pass of the display panel arranged on the upper side. Therefore, the non-display area between the display areas of the two overlapping display panels can be reduced or even eliminated. As a result, a large display device can be realized in which the user cannot easily detect the seams between the display panels.

[0098] At least a portion of the non-display area of ​​the upper display panel is a visible light-transmitting area and may overlap with the display area of ​​the lower display panel. Furthermore, at least a portion of the non-display area of ​​the lower display panel may overlap with the display area or the visible light-blocking area of ​​the upper display panel. Because these portions do not affect the narrowing of the display device's frame (reduction of the area outside the display area), area reduction is not necessary.

[0099] When the non-display area of ​​the display panel is large, the distance between the end of the display panel and the components within the display panel is long, thereby suppressing component degradation due to impurities invading from outside the display panel. For example, when an organic EL element is used as a display element, the longer the distance between the end of the display panel and the organic EL element, the less likely impurities such as moisture or oxygen are to intrude (or reach) the organic EL element from outside the display panel. Because the display device of one embodiment of the present invention can fully ensure the area of ​​the non-display area of ​​the display panel, even if a display panel using organic EL elements is used, a large display device with high reliability can be realized.

[0100] Here, after the two display panels are arranged in an overlapping manner, the relative positions of the two display panels may be offset. In addition, when the density of pixels provided in the display area of ​​the display panel is high, high position alignment accuracy is required, so that when the two display panels are arranged in an overlapping manner, the display panels are easily offset from the prescribed position.

[0101] When the relative positions of the two display panels are offset in the direction in which they are moving apart, the non-display area of ​​the lower display panel overlaps with the visible light-transmitting area of ​​the upper display panel. In other words, in the display device, the non-display area is formed between the display areas of the two display panels. For example, driver circuits and wiring near the display areas are easily visible to the user of the display device. As a result, when the output images of the two display panels are displayed as a single image, the user sees this single image as a split image.

[0102] Therefore, in one embodiment of the present invention, additional pixels (in other words, pseudo pixels) are provided between the display area and the area shielding visible light in the display panel arranged on the lower side. The color of the pseudo pixel is the same as the color of the pixel closest to the pseudo pixel in the display area. The gate signal and the source signal supplied to the pseudo pixel are equal to the gate signal and the source signal supplied to the pixel closest to the pseudo pixel in the display area. When the two display panels are offset in the direction of separation, the pseudo pixel of the display panel arranged on the lower side overlaps with the area of ​​the display panel arranged on the upper side that allows visible light to pass. By using these pseudo pixels for display, even if the two display panels are offset in the direction of separation, the formation of a non-display area between the display areas of the two overlapping display panels in the display device can be suppressed. Thus, a large display device can be realized in which the seams between the display panels are not easily recognized by the user.

[0103] In addition, in one embodiment of the present invention, in the display panel arranged on the lower side, the area of ​​the display element included in the pixel adjacent to the area blocking visible light (which can also be referred to as the area of ​​the display area of ​​the display element) is larger than the area of ​​the display element included in other pixels. When the two display panels are offset in the direction of separation, the area of ​​overlap between the pixels adjacent to the area blocking visible light of the display panel arranged on the lower side and the area allowing visible light to pass through the display panel arranged on the upper side increases. Even if misalignment occurs, the formation of a non-display area between the display areas of the two overlapping display panels can be suppressed. As a result, a large display device can be realized in which the user is not easily able to detect the seam between the display panels.

[0104] Specific examples of a display panel and a display device according to one embodiment of the present invention will be described below.

[0105] <Structure Example A>

[0106] Figure 1A A top view of the display panel 100 is shown.

[0107] Figure 1A The display panel 100 shown includes a display area 101, a display area 109, and an area 102. Here, the area 102 refers to a portion other than the display area 101 and the display area 109 in a plan view of the display panel 100. The area 102 may also be referred to as a non-display area.

[0108] Region 102 includes a region 110 that transmits visible light and a region 120 that blocks visible light. Region 110 that transmits visible light is adjacent to display region 101. Display region 109 is located between display region 101 and region 120 that blocks visible light, and is adjacent to both. Display region 109, region 110 that transmits visible light, and region 120 that blocks visible light may all be located along a portion of the periphery of display region 101.

[0109] exist Figure 1A In the display panel 100 shown, the display region 109 is arranged along one side of the display region 101. In the display panel 100, the display region 109 may be arranged along one or more sides of the display region 101.

[0110] exist Figure 1A In the display panel 100 shown in FIG. 1 , a region 110 that transmits visible light is disposed along one side of the display region 101. In the display panel 100, regions 110 that transmit visible light may be disposed along more than one side of the display region 101. Figure 1A As shown, the region 110 that transmits visible light is preferably in contact with the display region 101 and extends to the end of the display panel 100 .

[0111] A region 110 that transmits visible light is arranged along one of two opposing sides of the display region 101 , and a display region 109 is arranged along the other of the two opposing sides of the display region 101 .

[0112] exist Figure 1A In the display panel 100 shown, regions 120 for shielding visible light are arranged along two sides of the display region 101. In the display panel 100, the regions 120 for shielding visible light may extend to near the ends of the display panel 100.

[0113] Note, yes Figure 1A There is no limitation on the transmittance of visible light in the region 102 shown except for the region 110 that transmits visible light and the region 120 that blocks visible light.

[0114] The display area 101 includes a plurality of pixels arranged in a matrix and can display images. Each pixel is provided with one or more display elements. Examples of display elements include light-emitting elements such as EL elements, electrophoretic elements, display elements utilizing MEMS (micro-electromechanical systems), and liquid crystal elements. This embodiment primarily describes the use of EL elements.

[0115] Display area 109 includes multiple pixels arranged in one or more directions and can display images. Each pixel is provided with one or more display elements. Display area 109 can use the same display elements as display area 101. In other words, display area 109 includes dummy pixels.

[0116] A material that transmits visible light is used as the region 110 that transmits visible light. For example, the region 110 includes the substrate and bonding layer that constitute the display panel 100. A higher visible light transmittance in the region 110 is preferred, as the light extraction efficiency of the display panel overlapping below is improved. In the region 110 that transmits visible light, the average transmittance for light within the wavelength range of 450 nm to 700 nm is preferably 70% or higher, more preferably 80% or higher, and even more preferably 90% or higher.

[0117] In the visible light shielding region 120, for example, wiring electrically connected to pixels (specifically, transistors or display elements) included in the display region 101 is provided. In addition to such wiring, a driver circuit (such as a scanning line driver circuit or a signal line driver circuit) for driving the pixels may also be provided.

[0118] The display panel may include at least one of a scan line driver circuit and a signal line driver circuit. In addition, the display panel may not include both the scan line driver circuit and the signal line driver circuit. For example, an integrated circuit (IC) used as at least one of the scan line driver circuit and the signal line driver circuit may be electrically connected to the display panel. A display device including a display panel and an IC may be manufactured. The IC may be mounted on the display panel by a COG (Chip On Glass) method or a COF (Chip On Film) method. In addition, a flexible printed circuit (hereinafter referred to as FPC), TAB (Tape Automated Bonding) or TCP (Tape Carrier Package) with an IC mounted thereon may also be used for the display device.

[0119] The visible light shielding region 120 includes terminals (also referred to as connection terminals) electrically connected to an FPC, etc., and wiring electrically connected to the terminals, etc. In addition, if the terminals and wiring allow visible light to pass through, the terminals and wiring may be provided so as to extend to the visible light transmitting region 110.

[0120] Figure 1A The width W1 of the region 110 through which visible light is transmitted is preferably not less than 0.1 mm and not more than 150 mm, more preferably not less than 0.5 mm and not more than 100 mm, and even more preferably not less than 1 mm and not more than 50 mm. In the case where the width W1 of the region 110 through which visible light is transmitted is different for each display surface, or is different according to the position in a display panel, the shortest length is preferably within the above range. Since the region 110 through which visible light is transmitted can be used as a sealing area, the larger the width W1 of the region 110 through which visible light is transmitted, the longer the distance between the end of the display panel 100 and the display area 101 can be, thereby suppressing the intrusion of impurities such as water from the outside into the display area 101. Note that the width W1 of the region 110 through which visible light is transmitted is sometimes equivalent to the shortest distance between the display area 101 and the end of the display panel 100.

[0121] For example, when an organic EL element is used as a display element, by setting the width W1 of the visible light-transmitting region 110 to 0.5 mm or greater, degradation of the organic EL element can be effectively suppressed, thereby improving reliability. Furthermore, in areas other than the visible light-transmitting region 110, the distance between the end of the display region 101 and the end of the display panel 100 is preferably set within the above range.

[0122] Figure 1AThe width W2 of the display area 109 shown is preferably 0.1 mm to 5 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 5 mm. The width W2 of the display area 109 is preferably larger because the allowable range of misalignment when overlapping two display panels is wider. If the width of a pixel is greater than 5 mm, the width W2 of the display area 109 may also be greater than 5 mm.

[0123] When the width W2 of the display area 109 differs depending on the display panel, or when it differs depending on the position in the same display panel, the shortest length may be referred to as the width W2.

[0124] Figure 1B and Figure 1C Show Figure 1A An example of an enlarged view of region P1.

[0125] like Figure 1B and Figure 1C As shown, in the display area 101, a plurality of pixels 141 are arranged in a matrix. When the display panel 100 is implemented using the three colors of red, green, and blue to display a full-color image, the plurality of pixels 141 correspond to sub-pixels of any of the three colors. Furthermore, sub-pixels of colors such as white or yellow may also be provided in addition to the three colors mentioned above.

[0126] In this embodiment, the display area 101 includes pixels 141 arranged in m rows and n columns (m and n are each independently an integer greater than or equal to 2). The display area 109 includes pixels 149. The pixel in the a-th row and b-th column is denoted by affixing (a, b) to the reference numerals.

[0127] In the description of this embodiment, the horizontal direction in the drawings is the row direction, and the vertical direction is the column direction. However, this is not limiting and they can be reversed. In one embodiment of the present invention, either the signal line direction or the scan line direction can be the row direction. Furthermore, in the description of this embodiment, the bottom row is row 1 and the leftmost column is column 1. However, this is not limiting and the top row can be row 1 and the rightmost column can be column 1.

[0128] exist Figure 1B and Figure 1C Pixels 149 are provided in the column direction adjacent to the pixels 141 in the n-th column (ie, the pixels 141 in the outermost column in the display area 101). More than one column of pixels 149 may be provided. Figure 1B An example including pixels 149 in one column is shown. Figure 1C An example including two columns of pixels 149 is shown.

[0129] Since the permissible range of misalignment when two display panels are overlapped can be wider, it is preferable to arrange pixels 149 in multiple rows or columns.

[0130] exist Figure 1B , pixel 141(i, n-1) is located to the left of pixel 141(i, n) (i is an integer greater than or equal to 1 and less than or equal to m), and pixel 149(i, n+1) is located to the right of pixel 141(i, n). Similarly, pixel 141(i+1, n-1) is located to the left of pixel 141(i+1, n), and pixel 149(i+1, n+1) is located to the right of pixel 141(i+1, n).

[0131] exist Figure 1C , pixel 149(i, n+1) is located to the right of pixel 141(i, n), and pixel 149(i, n+2) is located to the right of pixel 149(i, n+1). Similarly, pixel 149(i+1, n+1) is located to the right of pixel 141(i+1, n), and pixel 149(i+1, n+2) is located to the right of pixel 149(i+1, n+1).

[0132] The color of the pixel 149 in the i-th row is the same as the color of the pixel 141 in the i-th row and n-th column. Furthermore, the gate signal and the source signal supplied to the pixel 149 in the i-th row are equal to the gate signal and the source signal supplied to the pixel 141 in the i-th row and n-th column. Thus, the pixel 149 in the i-th row and the pixel 141 in the i-th row and n-th column output light of the same color with the same timing and the same degree of brightness. Therefore, even if the two overlapping display panels are misaligned, it is possible to prevent the image from appearing disconnected at the boundary between the two display panels. For example, in Figure 1B In the example, the color of pixel 149 (i, n+1) is the same as the color of pixel 141 (i, n). In addition, the gate signal and source signal supplied to pixel 149 (i, n+1) are equal to the gate signal and source signal supplied to pixel 141 (i, n). Figure 1C , the colors of pixel 149 (i, n+1) and pixel 149 (i, n+2) are the same as the color of pixel 141 (i, n). The gate signal and source signal supplied to pixel 149 (i, n+1) and pixel 149 (i, n+2) are equal to the gate signal and source signal supplied to pixel 141 (i, n).

[0133] Figure 2A FIG. 1 shows a top view of the display device 10. A display device according to one embodiment of the present invention includes a plurality of display panels arranged in one or more directions. Figure 2A The display device 10 shown includes two Figure 1AThe display panel 100 is shown. Specifically, the display device 10 includes a display panel 100a and a display panel 100b.

[0134] Note that in this embodiment, to distinguish each display panel, the components included in each display panel, or the components related to each display panel, English letters are appended after the symbols for description. Unless otherwise specified, the display panel or component arranged at the bottom (opposite to the display surface) is appended with "a", and the one or more display panels and their components arranged above it are appended with "b", "c", and so on, in alphabetical order from the bottom.

[0135] The display device 10 is an example in which a display panel 100b is connected to an FPC 112b. The display panel 100b is electrically connected to an IC 115b via the FPC 112b. Similarly, the display panel 100a is electrically connected to an IC via the FPC.

[0136] Display panel 100a includes display area 101a, display area 109a, and area 102a. Area 102a includes area 120a that blocks visible light. Area 102a may also include area 110a that allows visible light to pass through. For example, if a display panel is further configured below display panel 100a, area 102a preferably includes area 110a that allows visible light to pass through.

[0137] Display panel 100b includes a display area 101b and an area 102b. Area 102b includes an area 110b that transmits visible light and an area 120b that blocks visible light. Display panel 100b may also include a display area 109b. For example, if a display panel is further configured above display panel 100b, display panel 100b preferably includes display area 109b.

[0138] A portion of the display panel 100b overlaps the upper side (display surface side) of the display panel 100a. Specifically, the visible light-transmitting region 110b of the display panel 100b overlaps the display region 101a of the display panel 100a. The visible light-blocking region 120b of the display panel 100b does not overlap the display region 101a of the display panel 100a. The display region 101b of the display panel 100b overlaps the visible light-blocking region 120a of the display panel 100a.

[0139] Since the visible light transmitting region 110 b overlaps the display region 101 a , the user of the display device 10 can see the entire display of the display region 101 a even if the display panel 100 b overlaps the display surface of the display panel 100 a .

[0140] Furthermore, when display area 101b of display panel 100b is superimposed on top of visible light shielding area 120a, no non-display area exists between display areas 101a and 101b. Therefore, the area where display areas 101a and 101b are seamlessly arranged can be used as display area 13 of display device 10.

[0141] Figure 2B Show Figure 2A An example of an enlarged view of region Q1.

[0142] As an example, Figure 2B 1 and 2. The pixel 141a in the n-2th column, the n-1th column, and the nth column included in the display panel 100a overlaps with the region 110b that transmits visible light.

[0143] exist Figure 2B , the pixel 141a of the nth column (the column closest to the display panel 100b) of the display panel 100a is adjacent to the pixel 141b of the 1st column (the column closest to the display panel 100a) of the display panel 100b. That is, Figure 2B The display panel 100 a and the display panel 100 b are shown in an ideal state where they overlap without any displacement.

[0144] like Figure 2A and Figure 2B As shown, when the display panels 100a and 100b are overlapped, the user of the display device 10 cannot see the region shielding visible light near the boundary between the two display panels. Therefore, it is difficult for the user to identify the seam between the display panels.

[0145] then, Figure 3A Show Figure 2A FIG. 1 is a top view of the display device 10 when the display panel 100a in the state moves in a direction away from the display panel 100b. Figure 3B Show Figure 3A An example of an enlarged view of region Q2.

[0146] exist Figure 3A In FIG. 1 , the visible light transmitting region 110 b of the display panel 100 b overlaps the display region 101 a and the display region 109 a of the display panel 100 a .

[0147] As described above, display panel 100a includes display area 109a between display area 101a and visible light-blocking area 120a. Therefore, when display panel 100a moves away from display panel 100b, visible light-transmitting area 110b can be prevented from overlapping visible light-blocking area 120a. In other words, users can be prevented from easily recognizing the seam between the display panels.

[0148] exist Figure 3B In the example, a portion of pixel 149a is located in Figure 2B For example, pixel 149(i,n+1) is located between pixel 141a(i,n) and pixel 141b(i,1).

[0149] like Figure 3A and Figure 3B As shown, when the display panel 100 a and the display panel 100 b are overlapped, a user of the display device 10 can see at least a portion of the display area 109 a near the boundary between the two display panels.

[0150] As described above, the color of pixel 149a in the i-th row is the same as the color of pixel 141a in the i-th row, n-th column. Furthermore, the gate signal and source signal supplied to pixel 149a in the i-th row are equal to the gate signal and source signal supplied to pixel 141a in the i-th row, n-th column. Consequently, pixel 149a in the i-th row and pixel 141a in the i-th row, n-th column output light of the same color at the same timing and with the same brightness. This prevents the image from appearing disconnected between display areas 101a and 101b due to misalignment of the display panels.

[0151] <Structure Example B>

[0152] Figure 4A Shown with Figure 1A Top views of different display panels 100 . Figure 4A The display panel 100 is shown with Figure 1A The difference in structure is that the display area 109 is not included. Figure 1A The description of the same parts will be omitted.

[0153] The display panel 100 includes a display area 101 and an area 102 .

[0154] The region 102 includes a region 110 that transmits visible light and a region 120 that blocks visible light. Both the region 110 that transmits visible light and the region 120 that blocks visible light are adjacent to the display region 101.

[0155] Figure 4B Show Figure 4A An example of an enlarged view of region P2.

[0156] exist Figure 4B , the area of ​​the pixel 141 in the nth column is larger than the area of ​​the pixel 141 in the n-1th column. For example, the area of ​​the pixel 141 (i, n) is larger than the area of ​​the pixel 141 (i, n-1).

[0157] In one embodiment of the present invention, the area of ​​the display element included in the pixel 141 in the nth column is larger than the area of ​​the display element included in the pixel 141 in the (n-1)th column. The larger area of ​​the display element included in the pixel 141 in the nth column is preferred because this allows for a wider range of misalignment when the two display panels are superimposed.

[0158] Here, when a pixel includes a light-emitting element as a display element, the pixel may include a driving transistor for controlling current flowing through the light-emitting element, wherein the source or drain of the driving transistor is connected to the light-emitting element.

[0159] exist Figure 4B In the embodiment, the potential supplied to the gate of the driving transistor included in the pixel 141 in the nth column is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 in the n-1th column. This can suppress the difference in luminance per unit area between the pixel 141 in the n-1th column and the pixel 141 in the nth column.

[0160] In addition, Figure 4B In the embodiment of the present invention, it is preferred that a current greater than the current flowing through the driving transistor included in the pixel 141 of the n-1 column can flow through the driving transistor included in the pixel 141 of the n-1 column. In this case, the brightness difference per unit area between the pixel 141 of the n-1 column and the pixel 141 of the n-1 column can be reduced. For example, a dual-gate transistor can be used as a transistor in which a larger current is desired to flow, and a single-gate transistor can be used as the other transistors. For example, the ratio W / L of the channel length (L) to the channel width (W) of the transistor in which a larger current is desired to flow can be made greater than the W / L of the other transistors.

[0161] When the two display panels 100a and 100b are overlapped, the overlapping area of ​​the pixels 141a in the nth column of the lower display panel 100a and the visible light-transmitting region 110b of the upper display panel 100b is preferably equal to the area of ​​the pixels 141a in the n-1th column. In this case, a portion of the pixels 141a in the nth column of the display panel 100a overlaps with the display region 101b of the display panel 100b.

[0162] like Figure 4C As shown, the narrower the overlap between the two display panels, the larger the overlap between pixel 141a in the nth column of display panel 100a and visible light-transmitting region 110b of display panel 100b. Even if the two display panels are offset in a direction away from each other, the display regions 101a and 101b can be prevented from separating. This prevents the image from appearing disconnected due to misalignment of the display panels.

[0163] <Structure Example C>

[0164] Figure 5A Show Figure 1B An example of deformation. Figure 5B Show Figure 3B An example of deformation.

[0165] exist Figure 5A , the area of ​​pixel 149 is larger than the area of ​​pixel 141 in the nth column. For example, the area of ​​pixel 149 (i, n+1) is larger than the area of ​​pixel 141 (i, n).

[0166] In one embodiment of the present invention, the area of ​​the display element included in pixel 149 is larger than the area of ​​the display element included in pixel 141 in the nth column. A larger area of ​​the display element included in pixel 149 is preferred because it increases the allowable range of misalignment when the two display panels are superimposed.

[0167] Here, when a pixel includes a light-emitting element as a display element, Figure 5A In the embodiment, the potential supplied to the gate of the driving transistor included in the pixel 149 is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 in the n-th column. Figure 5A In the embodiment, the driving transistor included in the pixel 149 is preferably capable of flowing a larger current than the driving transistor included in the pixel 141 in the n-th column. This can suppress the difference in luminance per unit area between the pixel 149 and the pixel 141 in the n-th column.

[0168] like Figure 5B As shown, the narrower the overlap area between the two display panels, the larger the overlap area between the pixels 149a of the display panel 100a and the visible light transmitting area 110b of the display panel 100b. By displaying in the display area 109a, it is possible to prevent the image from appearing disconnected between the display areas 101a and 101b due to misalignment of the display panels.

[0169] <Structural Example D>

[0170] Figure 6A Shown with Figure 1A A top view of a different display panel 100. Figure 1A The description of the same structure will be omitted.

[0171] Figure 6A The display panel 100 shown includes a display area 101 , a display area 109 , and an area 102 .

[0172] Region 102 includes a visible light transmitting region 110 and a visible light shielding region 120. Visible light transmitting region 110 is adjacent to display region 101. Display region 109 is located between display region 101 and visible light shielding region 120 and is adjacent to both.

[0173] exist Figure 6A In the display panel 100 shown, the display area 109 is arranged along two sides of the display area 101. Figure 6A Although an example is shown in which the widths W2 of the display area 109 on two sides are equal, the widths W2 of the respective sides may be different from each other.

[0174] exist Figure 6A In the display panel 100 shown, regions 110 that transmit visible light are arranged along two sides of the display region 101. Figure 6A Although an example is shown in which the widths W1 of the visible light transmitting regions 110 on both sides are equal, the widths W1 of the respective sides may be different from each other.

[0175] exist Figure 6A In the display panel 100 shown, regions 120 for shielding visible light are arranged along two sides of the display region 101 .

[0176] Figure 6B and Figure 6C Shown separately Figure 6A An example of an enlarged view of area P3.

[0177] exist Figure 6B In FIG, pixels 149 of one column are arranged in the row direction and the column direction so as to be adjacent to the pixels 141 of the mth row and the nth column. Figure 6B , pixel 141(m,n-1) is located to the left of pixel 141(m,n), and pixel 149(m,n+1) is located to the right of pixel 141(m,n). In addition, pixel 149(m+1,n) is located above pixel 141(m,n), and pixel 141(m-1,n) is located below pixel 141(m,n).

[0178] In addition, Figure 6B , pixel 149 (m+1, n+1) is provided diagonally to the upper right of pixel 141 (m, n). That is, display area 101 and display area 109 include pixels in m+1 rows and n+1 columns in total.

[0179] exist Figure 6C In the display area 101 and the display area 109, there are m+2 rows and n+2 columns of pixels in total. Figure 6C , pixel 149(m, n+1) is located to the right of pixel 141(m, n), and pixel 149(m, n+2) is located to the right of pixel 149(m, n+1). In addition, pixel 149(m+1, n) is located above pixel 141(m, n), and pixel 149(m+2, n) is located above pixel 149(m+1, n). Figure 6C, pixel 149 (m+1, n+1) is provided on the diagonally upper right side of pixel 141 (m, n), and pixel 149 (m+2, n+2) is provided on the diagonally upper right side of pixel 149 (m+1, n+1).

[0180] The number of pixels 149 in the row direction and the number in the column direction may be different. When the widths of the pixels 141 in the row direction and the column direction are different, it is preferable to provide more pixels 149 in the short side direction of the pixels 141 than in the long side direction.

[0181] The color of the pixel 149 in the i-th row (i is an integer greater than or equal to 1 and less than or equal to m) is the same as the color of the pixel 141 in the i-th row and n-th column. The gate signal and source signal supplied to the pixel 149 in the i-th row are equal to the gate signal and source signal supplied to the pixel 141 in the i-th row and n-th column. As a result, the pixel 149 in the i-th row outputs light of the same color at the same timing and with the same brightness as the pixel 141 in the i-th row and n-th column.

[0182] The color of the pixel 149 in the j-th column (j is an integer greater than or equal to 1 and less than or equal to n) is the same as the color of the pixel 141 in the m-th row and j-th column. The gate signal and source signal supplied to the pixel 149 in the j-th column are equal to the gate signal and source signal supplied to the pixel 141 in the m-th row and j-th column. As a result, the pixel 149 in the j-th column outputs light of the same color at the same timing and with the same brightness as the pixel 141 in the m-th row and j-th column.

[0183] The colors of pixels 149 in the m+1th row and beyond and the n+1th column and beyond are the same as those of pixel 141(m,n). The gate and source signals supplied to pixels 149 in the m+1th row and beyond and the n+1th column and beyond are equal to those supplied to pixel 141(m,n). As a result, pixels 149 in the m+1th row and beyond and the n+1th column and beyond output light of the same color at the same timing and with the same brightness as pixel 141(m,n).

[0184] Thus, even if two display panels that overlap each other in the row direction or the column direction are misaligned, it is possible to prevent the image from appearing disconnected at the boundary between the two display panels.

[0185] For example, in Figure 6B In the example, the color of pixel 149 (m+1, n-1) is the same as the color of pixel 141 (m, n-1). In addition, the gate signal and source signal supplied to pixel 149 (m+1, n-1) are equal to the gate signal and source signal supplied to pixel 141 (m, n-1). Figure 6C, the colors of pixel 149(m+1,n) and pixel 149(m+2,n) are the same as the color of pixel 141(m,n). The gate signal and source signal supplied to pixel 149(m+1,n) and pixel 149(m+2,n) are equal to the gate signal and source signal supplied to pixel 141(m,n).

[0186] Figure 7A Shown includes 4 Figure 6A The display device 10 includes a display panel 100. Specifically, the display device 10 includes display panels 100a, 100b, 100c, and 100d.

[0187] exist Figure 7A In the embodiment, the short side of the display panel 100a overlaps with the short side of the display panel 100b, and a portion of the display area 101a overlaps with a portion of the visible light transmitting area 110b. In addition, the long side of the display panel 100a overlaps with the long side of the display panel 100c, and a portion of the display area 101a overlaps with a portion of the visible light transmitting area 110c.

[0188] exist Figure 7A In the embodiment, a portion of the display region 101b overlaps a portion of the region 110c that transmits visible light and a portion of the region 110d that transmits visible light. In addition, a portion of the display region 101c overlaps a portion of the region 110d that transmits visible light.

[0189] Therefore, if Figure 7A As shown, the area in which the display areas 101 a to 101 d are seamlessly arranged can be used as the display area 13 of the display device 10 .

[0190] Figure 7B Show Figure 7A An example of an enlarged view of region Q3.

[0191] As an example, Figure 7B The following situation is shown: the pixels 141a in the n-2th column, n-1th column and nth column included in the display panel 100a overlap with the areas 110b and 110d that allow visible light to pass through, and the pixels 141a in the m-2th column, m-1th column and mth column included in the display panel 100a overlap with the areas 110c and 110d that allow visible light to pass through.

[0192] exist Figure 7B, the pixel 141a of the nth column of the column closest to the display panel 100b side in the display panel 100a is adjacent to the pixel 141b of the 1st column of the column closest to the display panel 100a side in the display panel 100b. The pixel 141a of the mth row of the row closest to the display panel 100c side in the display panel 100a is adjacent to the pixel 141c of the 1st row of the row closest to the display panel 100a side in the display panel 100c. The pixel 141c of the nth column of the column closest to the display panel 100d side in the display panel 100c is adjacent to the pixel 141d of the 1st column of the column closest to the display panel 100c side in the display panel 100d. The pixel 141b of the mth row of the row closest to the display panel 100d side in the display panel 100b is adjacent to the pixel 141d of the 1st row of the row closest to the display panel 100b side in the display panel 100d. That is, Figure 7B The figure shows an ideal state in which four display panels 100 overlap without any deviation.

[0193] like Figure 7A and Figure 7B As shown, when four display panels are overlapped, a user of the display device 10 cannot see the region blocking visible light near the boundary between two display panels. Therefore, it is not easy for the user to identify the seams between the display panels.

[0194] then, Figure 8A Show Figure 7A 10 is a plan view of the display device 10 when the display panel 100a is shifted in a direction away from the display panels 100b to 100d. Figure 8B Show Figure 8A An example of an enlarged view of region Q4.

[0195] exist Figure 8A In the embodiment, the visible light transmitting regions 110 b to 110 d of the display panel 100 b overlap with the display regions 101 a and 109 a of the display panel 100 a.

[0196] As described above, display panel 100a includes display area 109a between display area 101a and visible light-blocking area 120a. Therefore, when display panel 100a is displaced away from display panels 100b to 100d, it is possible to prevent visible light-transmitting areas 110b to 110d from overlapping visible light-blocking area 120a. In other words, it is possible to prevent users from easily recognizing the seam between the display panels.

[0197] exist Figure 8B In the display panel 100a, a portion of the pixel 149a is located at Figure 7B1, 100d. A portion of pixel 149a of display panel 100a is located between pixel 141a in the nth column of display panel 100a and pixel 141b in the 1st column of display panel 100b. Similarly, a portion of pixel 149a of display panel 100a is located between pixel 141a in the mth row of display panel 100a and pixel 141c in the 1st row of display panel 100c. In addition, a portion of pixel 149a of display panel 100a is located diagonally to the upper right of pixel 141a(m,n) of display panel 100a and diagonally to the lower left of pixel 141d(1,1) of display panel 100d.

[0198] When Figure 8A and Figure 8B When the four display panels are overlapped as shown, the user of the display device 10 sees at least a portion of the display area 109 a of the display panel 100 a through the visible light-transmitting area 110 included in the display panels 100 b to 100 d .

[0199] As described above, the color of pixel 149 in the i-th row is the same as the color of pixel 141 in the i-th row and n-th column, and the color of pixel 149 in the j-th column is the same as the color of pixel 141 in the m-th row and j-th column. The gate signal and source signal supplied to pixel 149 in the i-th row are equal to the gate signal and source signal supplied to pixel 141 in the i-th row and n-th column, and the gate signal and source signal supplied to pixel 149 in the j-th column are equal to the gate signal and source signal supplied to pixel 141 in the m-th row and j-th column. Furthermore, the color of pixels 149 in the m+1th row and beyond and the n+1th column and beyond is the same as the color of pixel 141(m,n). The gate signal and source signal supplied to pixels 149 in the m+1th row and beyond and the n+1th column and beyond are equal to the gate signal and source signal supplied to pixel 141(m,n). Thus, pixel 149 outputs light of the same color at the same timing and with the same brightness as the adjacent pixel 141. Therefore, even if two overlapping display panels are misaligned in the row or column direction, the image can be prevented from appearing disconnected at the boundary between the two display panels.

[0200] <Structural Example E>

[0201] Figure 9A Shown with Figure 6A Top views of different display panels 100 . Figure 9A The display panel 100 is shown with Figure 6A The difference in structure is that the display area 109 is not included. Figure 6A The description of the same structure will be omitted.

[0202] The display panel 100 includes a display area 101 and an area 102 .

[0203] The region 102 includes a region 110 that transmits visible light and a region 120 that blocks visible light. Both the region 110 that transmits visible light and the region 120 that blocks visible light are adjacent to the display region 101.

[0204] Figure 9B Show Figure 9A An example of an enlarged view of area P4.

[0205] exist Figure 9B , the area of ​​pixel 141 in the nth column is larger than the area of ​​pixel 141 in the n-1th column. For example, the area of ​​pixel 141(m-1, n) is larger than the area of ​​pixel 141(m-1, n-1). Similarly, the area of ​​pixel 141 in the mth row is larger than the area of ​​pixel 141 in the m-1th row. For example, the area of ​​pixel 141(m, n-1) is larger than the area of ​​pixel 141(m-1, n-1). In addition, the area of ​​pixel 141(m, n) is larger than the area of ​​pixel 141(m-1, n-1).

[0206] In one embodiment of the present invention, the area of ​​the display element included in pixel 141 in the nth column is larger than the area of ​​the display element included in pixel 141 in the n-1th column. Similarly, the area of ​​the display element included in pixel 141 in the mth row is larger than the area of ​​the display element included in pixel 141 in the m-1th row. Furthermore, the area of ​​the display element included in pixel 141 (m, n) is larger than the area of ​​the display element included in pixel 141 (m-1, n-1). This can expand the allowable range of misalignment between two display panels that overlap in the row or column direction.

[0207] When a pixel includes a light-emitting element as a display element, Figure 9B , the potential supplied to the gate of the driving transistor included in the pixel 141 in the nth column is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 in the n-1th column. Similarly, the potential supplied to the gate of the driving transistor included in the pixel 141 in the mth row is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 in the m-1th row. Furthermore, the potential supplied to the gate of the driving transistor included in the pixel 141 (m, n) is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 (m-1, n-1).

[0208] In addition, Figure 9B, the driving transistor included in the pixel 141 in the nth column is preferably capable of flowing a larger current than the driving transistor included in the pixel 141 in the n-1th column. Similarly, the driving transistor included in the pixel 141 in the mth row is preferably capable of flowing a larger current than the driving transistor included in the pixel 141 in the m-1th row. Furthermore, the driving transistor included in the pixel 141 (m, n) is preferably capable of flowing a larger current than the driving transistor included in the pixel 141 (m-1, n-1).

[0209] When four display panels are stacked, the overlapping area of ​​the pixel 141a of the lowermost display panel 100a, which is larger than the other pixels 141a, and the visible light transmitting area 110b of the upper display panel 100b is preferably equal to the area of ​​the other pixels 141a. In this case, a portion of the pixel 141a of the display panel 100a, which is larger than the other pixels 141a, overlaps with the display areas 101b to 101d of the display panels 100b to 100d.

[0210] like Figure 9C As shown, the further the display panel 100a is displaced away from the other display panels, the larger the area of ​​overlap between pixel 141a of the display panel 100a, which is larger than other pixels 141a, and the visible light-transmitting regions 110b to 110d of the display panels 100b to 100d. Even if the display panel 100a is displaced away from the other display panels, the display region 101a is prevented from displacing from the display regions 101b to 101d. This prevents the image from appearing disconnected due to misalignment of the display panels.

[0211] <Structural Example F>

[0212] Figure 10A Show Figure 6B An example of deformation. Figure 10B Show Figure 7B An example of deformation.

[0213] exist Figure 10A , the area of ​​pixels 149 arranged in the column direction is larger than the area of ​​pixels 141 in the n-th column. For example, the area of ​​pixel 149(m, n+1) is larger than the area of ​​pixel 141(m, n). Similarly, the area of ​​pixels 149 arranged in the row direction is larger than the area of ​​pixels 141 in the m-th row. For example, the area of ​​pixel 149(m+1, n) is larger than the area of ​​pixel 141(m, n). Furthermore, the area of ​​pixel 149(m+1, n+1) is larger than the area of ​​pixel 141(m, n).

[0214] In one embodiment of the present invention, the area of ​​the display element included in pixel 149 arranged in the column direction is larger than the area of ​​the display element included in pixel 141 in the nth column. Similarly, the area of ​​the display element included in pixel 149 arranged in the row direction is larger than the area of ​​the display element included in pixel 141 in the mth row. Furthermore, the area of ​​the display element included in pixel 149 (m+1, n+1) is larger than the area of ​​the display element included in pixel 141 (m, n). This increases the allowable range of misalignment between two display panels that overlap in the row or column direction.

[0215] When a pixel includes a light-emitting element as a display element, Figure 10A In the embodiment of the present invention, the potential supplied to the gate of the driving transistor included in the pixel 149 arranged in the column direction is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 in the n-th column. Similarly, the potential supplied to the gate of the driving transistor included in the pixel 149 arranged in the row direction is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 in the m-th row. Furthermore, the potential supplied to the gate of the driving transistor included in the pixel 149 (m+1, n+1) is preferably higher than the potential supplied to the gate of the driving transistor included in the pixel 141 (m, n).

[0216] In addition, Figure 10A In the embodiment, the driving transistors included in the pixels 149 arranged in the column direction are preferably capable of passing a larger current than the driving transistors included in the pixels 141 in the nth column. Similarly, the driving transistors included in the pixels 149 arranged in the row direction are preferably capable of passing a larger current than the driving transistors included in the pixels 141 in the mth row. Furthermore, the driving transistors included in the pixels 149 (m+1, n+1) are preferably capable of passing a larger current than the driving transistors included in the pixels 141 (m, n).

[0217] like Figure 10B As shown, the further the display panel 100a is offset from the other display panels, the larger the area of ​​overlap between the pixels 149a of the display panel 100a and the visible light transmitting regions 110b to 110d of the display panels 100b to 100d. By displaying in the display region 109a, it is possible to prevent the image from appearing disconnected between the two display regions due to misalignment of the display panels.

[0218] <Circuit Diagram of Structural Example A>

[0219] An example of a method for making the gate signal and the source signal supplied to the pixel 149 in the i-th row and the gate signal and the source signal supplied to the pixel in the i-th row and the n-th column equal in the configuration example A will be described.

[0220] Figure 11 1 is a circuit diagram illustrating the connection relationship between the display area 101, the display area 109, the scanning line driver circuit GD, and the signal line driver circuit SD.

[0221] The display region 101 includes a plurality of pixels 141. The display region 109 includes a plurality of pixels 149. Each of the pixels 141 and 149 includes a selection transistor 70a, a drive transistor 70b, and a light-emitting element 40.

[0222] Each pixel 141(i, j) (i is an integer from 1 to m, and j is an integer from 1 to n) is electrically connected to a signal line 51(j) and a scan line 52(i). The signal line 51(j) is electrically connected to a signal line driver circuit SD. The scan line 52(i) is electrically connected to a scan line driver circuit GD.

[0223] In the selection transistor 70a of the pixel 141(i, j), the gate is electrically connected to the scan line 52(i), one of the source and drain is electrically connected to the signal line 51(j), and the other of the source and drain is electrically connected to the gate of the drive transistor 70b. One of the source and drain of the drive transistor 70b is electrically connected to the pixel electrode of the light-emitting element 40, and the other of the source and drain is supplied with a constant potential.

[0224] The pixel 149 (i, q) (q is n+1, n+2, or n+3) is electrically connected to a signal line 51 (q) and a scanning line 52 (i). The signal line 51 (q) is electrically connected to the signal line driving circuit SD.

[0225] In the selection transistor 70a of the pixel 149(i,q), the gate is electrically connected to the scan line 52(i), one of the source and drain is electrically connected to the signal line 51(q), and the other of the source and drain is electrically connected to the gate of the drive transistor 70b. One of the source and drain of the drive transistor 70b is electrically connected to the pixel electrode of the light-emitting element 40, and the other of the source and drain is supplied with a constant potential.

[0226] The gates of the selection transistors 70a included in the pixels 141 and 149 in the i-th row are both electrically connected to the scanning line 52(i). That is, the gate signal supplied to the pixel 141 in the i-th row is equal to the gate signal supplied to the pixel 149 in the i-th row.

[0227] One of the source and drain electrodes of the select transistor 70a of pixel 141(i,n) is electrically connected to the signal line 51(n). One of the source and drain electrodes of the select transistor 70a of pixel 149(i,q) is electrically connected to the signal line 51(q). By supplying the same source signal to the signal line 51(q) and the signal line 51(n) via the signal line driver circuit SD, the source signal supplied to the pixel 149 can be made equal to the source signal supplied to the pixel 141 in the nth column.

[0228] Figure 12 and Figure 13 Show Figure 11 A modified example of the circuit diagram. Figure 12 and Figure 11 The difference is that the signal line 51 (n+1) is connected to the signal line 51 (n+2) and the signal line 51 (n+3). Figure 13 and Figure 11 The difference is that the signal line 51 (n) is connected to the signal line 51 (n+1), the signal line 51 (n+2) and the signal line 51 (n+3).

[0229] exist Figure 11 In the embodiment, the same source signal is supplied to all pixels 149 included in the display area 109. Therefore, one embodiment of the present invention is not limited to a structure in which the signal lines connected to the display area 109 are independently connected to the signal line driver circuit SD. Figure 12 As shown, a structure may also be adopted in which only one signal line connected to the pixel 149 included in the display area 109 is directly connected to the signal line driving circuit SD.

[0230] By reducing the number of signal lines connected to the signal line driver circuit SD, Figure 12 In the structure of Figure 11 Compared with the structure of , the writing time of each signal line can be extended.

[0231] exist Figure 11 , the same source signal as that of the pixels in the nth column of the display region 101 is supplied to the pixels included in the display region 109. Figure 13 As shown, the signal lines connected to the pixels 149 included in the display area 109 may not be directly connected to the signal line driver circuit SD.

[0232] exist Figure 13 The number of signal lines connected to the signal line driver circuit SD is the same between a structure including the display area 109 and a structure without the display area 109. That is, when a display panel including the display area 109 is used in a display device, there is no need to design a new driver circuit, manufacture a new IC, or produce new video data, thereby reducing manufacturing costs.

[0233] Figure 14 An example is shown in which the display region 109 is provided adjacent to the pixels in the m-th row of the display region 101 .

[0234] The structure and connection relationship of pixel 141 (i, j) are similar to Figure 11 same.

[0235] The pixel 149 (p, j) (p is m+1, m+2, or m+3) is electrically connected to a signal line 51 (j) and a scanning line 52 (m).

[0236] In the selection transistor 70a of the pixel 149(p,j), the gate is electrically connected to the scanning line 52(m), one of the source and drain is electrically connected to the signal line 51(j), and the other of the source and drain is electrically connected to the gate of the driving transistor 70b. One of the source and drain of the driving transistor 70b is electrically connected to the pixel electrode of the light-emitting element 40, and the other of the source and drain is supplied with a constant potential.

[0237] The gates of the select transistors 70a included in the pixels 141(m, j) and 149 are both electrically connected to the scan line 52(m). One of the source and drain of the select transistors 70a included in the pixels 141 in the j-th column and the pixels 149 in the j-th column is electrically connected to the signal line 51(j). In other words, the gate signal and source signal supplied to the pixel 141 in the j-th column are equal to the gate signal and source signal supplied to the pixel 149 in the j-th column.

[0238] In one embodiment of the present invention, the same gate signal as that of the pixel 141 in the mth row of the display region 101 is supplied to the pixel 149 included in the display region 109. Figure 14 As shown, the scan lines connected to the pixels 149 included in the display area 109 may not be directly connected to the scan line driver circuit GD.

[0239] exist Figure 14 The number of scan lines connected to the scan line driver circuit GD is the same between a structure including the display area 109 and a structure without the display area 109. That is, when a display panel including the display area 109 is used in a display device, there is no need to design a new driver circuit, manufacture a new IC, or produce new video data, thereby reducing manufacturing costs.

[0240] Figure 15 A circuit diagram illustrating the connection relationship among the display area 101, the display area 109, the scanning line driver circuit GD, and the signal line driver circuit SD in the configuration example D is shown.

[0241] The structure and connection relationship of pixel 141 (i, j) are similar to Figure 11same.

[0242] The pixel 149 (i, q) (q is n+1, n+2, or n+3) is electrically connected to a signal line 51 (n) and a scanning line 52 (i).

[0243] The pixel 149 (p, j) (p is m+1, m+2, or m+3) is electrically connected to a signal line 51 (j) and a scanning line 52 (m).

[0244] The pixel 149 (p, q) (p is m+1, m+2 or m+3, and q is n+1, n+2 or n+3) is electrically connected to a signal line 51 (n) and a scanning line 52 (m).

[0245] In the selection transistor 70a of the pixel 149(p,q), the gate is electrically connected to the scanning line 52(m), one of the source and drain is electrically connected to the signal line 51(n), and the other of the source and drain is electrically connected to the gate of the driving transistor 70b. One of the source and drain of the driving transistor 70b is electrically connected to the pixel electrode of the light-emitting element 40, and the other of the source and drain is supplied with a constant potential.

[0246] The gates of the select transistors 70a included in the pixels 141(m,n) and 149(p,q) are both electrically connected to the scan line 52(m). In other words, the gate signal supplied to the pixel 141(m,n) is equal to the gate signal supplied to the pixel 149(p,q).

[0247] One of the source and drain of the select transistor 70a included in the pixel 141(m,n) and the pixel 149(p,q) is electrically connected to the signal line 51(n). In other words, the source signal supplied to the pixel 141(m,n) is equal to the source signal supplied to the pixel 149(p,q).

[0248] exist Figure 15 The number of signal lines connected to the signal line driver circuit SD and the number of scan lines connected to the scan line driver circuit GD are the same between a structure including the display area 109 and a structure without the display area 109. That is, when a display panel including the display area 109 is used in a display device, there is no need to design a new driver circuit, manufacture a new IC, or produce new video data, thereby reducing manufacturing costs.

[0249] Although Figures 11 to 15 Although an example is shown in which the pixel 141 and the pixel 149 have the same structure, one embodiment of the present invention is not limited to this.

[0250] Figure 16A and Figure 16BAn example is shown in which the pixel 149 includes the driving transistor 70 b and the light-emitting element 40 but does not include the selection transistor 70 a .

[0251] exist Figure 16A In the embodiment, the gates of the driving transistors 70 b included in the pixels 149 (m+2,n) and 149 (m+1,n) are electrically connected to the gate of the driving transistor 70 b included in the pixel 141 (m,n).

[0252] exist Figure 16B In the embodiment, the gates of the driving transistors 70 b included in the pixels 149 ( m, n+1) and 149 ( m, n+2) are electrically connected to the gate of the driving transistor 70 b included in the pixel 141 ( m, n ).

[0253] Figure 16C and Figure 16D An example is shown in which the pixel 149 includes the light-emitting element 40 but does not include the selection transistor 70 a and the drive transistor 70 b .

[0254] exist Figure 16C In the example, the pixel electrode of the light-emitting element 40 included in the pixel 149 (m+1, n) is electrically connected to the pixel electrode of the light-emitting element 40 included in the pixel 141 (m, n).

[0255] exist Figure 16D In the example, the pixel electrode of the light-emitting element 40 included in the pixel 149 (m, n+1) is electrically connected to the pixel electrode of the light-emitting element 40 included in the pixel 141 (m, n).

[0256] exist Figure 16C and Figure 16D It is preferable that a current larger than a current flowing through a driving transistor electrically connected to one light emitting element 40 can flow through the driving transistor 70 b electrically connected to a plurality of light emitting elements 40 .

[0257] By changing the pixel structure in this manner, the gate signal and source signal supplied to the pixel 149 can be made equal to the gate signal and source signal supplied to the pixel 141 in the nth column of the same row as the pixel 149 or the pixel 141 in the mth row of the same column as the pixel 149. Furthermore, even if the display area 109 is provided, the number of signal lines connected to the signal line driver circuit SD and the number of scan lines connected to the scan line driver circuit GD can be kept constant.

[0258] <Circuit Diagram of Structural Example B>

[0259] An example of a method of causing a current larger than a current flowing through the drive transistor included in the pixel 141 in the n-th column in the structural example B to flow through the drive transistor included in the pixel 141 in the n-1th column will be described.

[0260] Figure 17 A circuit diagram illustrating the connection relationship among the pixel 141, the scanning line driver circuit GD, and the signal line driver circuit SD is shown.

[0261] The pixels 141 arranged in the 1st to (n-1th) columns all include a selection transistor 70a, a drive transistor 70b, and a light emitting element 40. The pixels 141 arranged in the nth column all include a selection transistor 70a, a drive transistor 70c, and a light emitting element 40.

[0262] Each pixel 141(i, j) (i is an integer from 1 to m, and j is an integer from 1 to n) is electrically connected to a signal line 51(j) and a scan line 52(i). The signal line 51(j) is electrically connected to a signal line driver circuit SD. The scan line 52(i) is electrically connected to a scan line driver circuit GD.

[0263] In the selection transistor 70a of the pixel 141(i, j), the gate is electrically connected to the scan line 52(i), one of the source and drain is electrically connected to the signal line 51(j), and the other of the source and drain is electrically connected to the gate of the drive transistor 70b (when j=n, the drive transistor 70c). One of the source and drain of the drive transistor 70b (when j=n, the drive transistor 70c) is electrically connected to the light-emitting element 40, and the other of the source and drain is supplied with a constant potential.

[0264] The drive transistor 70c includes a back gate. The back gate is electrically connected to the gate. The current flowing through the dual-gate transistor can be greater than the current flowing through the single-gate transistor. Therefore, by using the dual-gate drive transistor 70c in the pixel 141 of the nth column and using the single-gate drive transistor 70b in the pixel 141 of the n-1th column, a current greater than the current flowing through the drive transistor included in the pixel 141 of the n-1th column can flow through the drive transistor included in the pixel 141 of the nth column.

[0265] The same method can also be used when a current larger than a current flowing through the driving transistor included in the pixel 141 in the n-th column is caused to flow through the driving transistor included in the pixel 149 in the structural example C.

[0266] Figure 18 An example is shown in which a dual-gate drive transistor 70 c is used in the pixel 149 and a single-gate drive transistor 70 b is used in the pixel 141 .

[0267] exist Figure 18, the signal line connected to the pixel 141 in the n-1 column is different from the signal line connected to the pixel 141 in the n-1 column. Therefore, the potential supplied to the pixel 141 in the n-1 column can be higher than the potential supplied to the pixel 141 in the n-1 column. Thus, the potential of the gate electrode of the driving transistor included in the pixel 141 in the n-1 column can be higher than the potential of the gate electrode of the driving transistor included in the pixel 141 in the n-1 column. In this case, the pixel 141 in the n-1 column and the pixel 141 in the n-1 column can have the same structure. For example, the pixel 141 in the n-1 column and the pixel 141 in the n-1 column can both include a selection transistor 70a, a driving transistor 70b, and a light-emitting element 40. Or, for example, the pixel 141 in the n-1 column and the pixel 141 in the n-1 column can both include a selection transistor 70a, a driving transistor 70c, and a light-emitting element 40.

[0268] <Pixel Layout Diagram of Structural Example C>

[0269] Another method of causing a current larger than the current flowing through the drive transistor included in the pixel 141 in the n-th column to flow through the drive transistor included in the pixel 149 in the configuration example C will be described. The same method can also be used in the configuration examples B, E, and F.

[0270] 19A to 19D An example of a circuit diagram of a pixel is shown. Figure 20A and Figure 20B and Figure 21A and Figure 21B An example of a pixel layout is shown. In the layout diagram, some components such as an insulating layer are omitted. Figure 20B and Figure 21B Yes Figure 20A and Figure 21A A diagram showing an additional pixel electrode 36.

[0271] Figure 19A The pixel circuit 80 shown includes a selection transistor 70a, a drive transistor 70b, and a capacitor 85. The pixel circuit 80 is connected to the signal line 51, the scanning line 52, and the power supply line 55. The light-emitting element 40 includes a pixel electrode 36 and a common electrode 38. The power supply line 55 supplies a specified potential or signal to one of the source and drain of the capacitor 85 and the drive transistor 70b.

[0272] Figure 19B The pixel circuit 80 and Figure 19A The pixel circuit 80 is different in the connection relationship of the capacitor 85. Figure 19C and Figure 19D The pixel circuit 80 and Figure 19A and Figure 19B The pixel circuit 80 is different in that it does not include a single-gate drive transistor 70 b but includes a dual-gate drive transistor 70 c .

[0273] Figure 20A 、 Figure 20B 、 Figure 21A and Figure 21B The pixel layout shown can be applied to Figure 5A or Figure 10A The display panel 100 shown in FIG. In addition, the pixel layout can also be applied to Figure 4A or Figure 9A Such as a display panel in which the area of ​​the display region of the display element is different for each pixel.

[0274] exist Figure 20A 、 Figure 20B 、 Figure 21A and Figure 21B The pixel 141 shown uses Figure 19A The pixel circuit 80 shown. Figure 20A and Figure 20B The pixel 149 shown also uses Figure 19A The pixel circuit 80 shown. Figure 21A and Figure 21B The pixel 149 shown uses Figure 19C The pixel circuit 80 is shown.

[0275] The connection relationship within each pixel will be described. A portion of the scan line 52 serves as the gate electrode of the select transistor 70a. A portion of the signal line 51 serves as the source or drain electrode of the select transistor 70a. The semiconductor layer 72a overlaps with a portion of the scan line 52, and the signal line 51 overlaps with a portion of the semiconductor layer 72a. A conductive layer 74b, which serves as the other of the source and drain electrodes of the select transistor 70a, is provided on the side of the semiconductor layer 72a opposite the signal line 51. The conductive layer 74b is electrically connected to the conductive layer 76. A portion of the conductive layer 76 serves as the gate electrode of the drive transistor 70b, 70b1, 70b2, or 70c. Another portion of the conductive layer 76 serves as one electrode of the capacitor 85. A portion of the power supply line 55 serves as the other electrode of the capacitor 85, while another portion serves as one of the source and drain electrodes of the drive transistor 70b, 70b1, 70b2, or 70c. The other of the source and the drain of the driving transistor 70 b , 70 b 1 , 70 b 2 , or 70 c is electrically connected to the pixel electrode 36 , 36 a , or 36 b .

[0276] exist Figure 20B and Figure 21B In the embodiment, the light emitting area 83b is larger than the light emitting area 83a.

[0277] exist Figure 20A and Figure 20BIn the example, the W / L ratio of the driving transistor 70b2 in pixel 149 is greater than the W / L ratio of the driving transistor 70b1 in pixel 141. The greater the W / L ratio of the driving transistor, the greater the current that can flow. Therefore, even if the light-emitting area 83b is larger than the light-emitting area 83a, the brightness of the light-emitting area 83b can be prevented from being lower than that of the light-emitting area 83a.

[0278] Although Figure 20A and Figure 20B The example in which the semiconductor layer 72b2 is longer than the semiconductor layer 72b1 in the channel width direction is shown, but the present invention is not limited thereto. At least one of the channel length L and the channel width W of the driving transistor 70b1 and the driving transistor 70b2 may be different from each other.

[0279] exist Figure 21A and Figure 21B In the example, the driving transistor 70b of pixel 149 is a dual-gate transistor, while the driving transistor 70c of pixel 141 is a single-gate transistor. As described above, the current flowing through the dual-gate transistor can be greater than the current flowing through the single-gate transistor. Therefore, even if the light-emitting area 83b is larger than the light-emitting area 83a, the brightness of the light-emitting area 83b can be prevented from being lower than that of the light-emitting area 83a.

[0280] The driving transistor 70c has a structure in which a gate 77 is added to the driving transistor 70b. Figure 21A and Figure 21B While the example in which the two gates of the driver transistor 70c are connected to each other is shown, the present invention is not limited thereto. The two gates of the driver transistor 70c may not be connected to each other. In this case, different potentials may be supplied to the two gates. For example, when an n-channel transistor is used as the driver transistor 70c, by supplying a potential to shift the threshold voltage negatively to one gate, the current flowing when a predetermined potential is applied to the other gate can be increased.

[0281] When Figure 1A When the display area of ​​the display element is equal in all pixels, the driving transistors in all pixels can have the same structure and all pixels can have the same layout. Figure 20A 、 Figure 20B 、 Figure 21A and Figure 21B Any of the layouts of pixels 141 and pixels 149 shown.

[0282] <Display Area of ​​Display Component>

[0283] Next, the layout of the display area of ​​the display element will be described.

[0284] Figure 22A An example of a configuration of pixels in four rows and four columns included in a display panel is shown. Figures 22B to 22E Show Figure 22A An example of a layout of a display area of ​​a display element included in each pixel. Figures 22B to 22E 1 shows a display area 41 of a display element included in pixel 141 and a display area 49 of a display element included in pixel 149. Furthermore, the color of the pixel corresponding to each display area is indicated by alphabetical letters (R for red, G for green, B for blue, and W for white).

[0285] There are no specific restrictions on the order in which the colors are arranged. There are also no specific restrictions on the type and number of colors. The area of ​​the display region of the display element can vary depending on the color. Alternatively, the area of ​​the display region of the display element of all colors can be the same.

[0286] Figure 22B An example of the layout of the display area of ​​the display elements included in the pixels of the three colors of RGB is shown. The display area 41 of the n-2th column corresponds to the pixel 141 of red (R). The display area 41 of the n-1th column corresponds to the pixel 141 of green (G). The display area 41 of the nth column corresponds to the pixel 141 of blue (B). The display area 49 of the n+1th column all corresponds to the pixel 149 of blue (B). The display area 49 of the m+1th row and jth column and the display area 41 of the mth row and jth column correspond to the pixels 141 and 149 of the same color. The area of ​​the display area 41 of all display elements is the same. The area of ​​the display area 41 and the display area 49 are also the same.

[0287] Figure 22C : An example of a layout of a display area of ​​a display element including pixels of the four colors RGBW is shown. The pixels of red (R) and blue (B) are located in the same row. The pixels of green (G) and white (W) are located in the same row. The pixels of red (R) and green (G) are located in the same column. The pixels of blue (B) and white (W) are located in the same column. The color of pixel 149 in the m+1th row and jth column is the same as the color of pixel 141 in the mth row and jth column. The color of pixel 149 in the i-th row and n+1th column is the same as the color of pixel 141 in the i-th row and nth column. The colors of pixel 141 (m, n) and pixel 149 (m+1, n+1) are both blue.

[0288] Figure 22DAn example of the layout of the display area of ​​the display element including pixels of three colors RGB is shown. The red (R) pixels are located in the same row as the blue (B) pixels. The green (G) pixels are located in the same row as the blue (B) pixels. The red (R) pixels and the green (G) pixels do not exist in the same row. The red (R) pixels and the green (G) pixels are located in the same column. There are no pixels of other colors in the column where the blue (B) pixels are located. Figure 22D In FIG. 4 , the display areas 41 and 49 of the display elements included in the blue pixel are smaller than the display areas 41 and 49 of the display elements included in the pixels of other colors.

[0289] Figure 22E An example of a layout of the display area of ​​the display element included in the pixels of three colors of RGB is shown. Among a plurality of pixels located in the same row, the display area of ​​the display element is not necessarily located in the same row. Figure 22E This example shows a layout where the display areas 41 and 49 of the display elements included in each row of pixels are divided into two rows. The display areas 41 and 49 of the display elements included in the blue pixels are below the display areas of the display elements included in the pixels of other colors. This layout is suitable, for example, for manufacturing light-emitting elements using a separate coating method.

[0290] Pixels do not necessarily need to be arranged in m rows and n columns. Figure 23A and Figure 23C As shown, the display panel 100 may have a structure in which no pixels are included at coordinates of a portion of m rows and n columns.

[0291] Figure 23B Show Figure 23A An example of a layout of a display area of ​​a display element included in each pixel. Figure 23D Show Figure 23C An example of a layout of a display area of ​​a display element included in each pixel. Figure 23A and Figure 23C In , columns including m pixels and columns including m / 2 pixels are alternately arranged. 23A to 23D In this case, m is an even number. Figure 23A An example is shown in which m pixels are arranged in the n-th column (the outermost column in the display area 101 ). Figure 23C An example is shown in which m / 2 pixels are arranged in the n-th column (the outermost column in the display area 101 ).

[0292] exist Figure 23B , the display areas 41 and 49 of the display elements included in the blue pixel are larger than the display areas 41 and 49 of the display elements included in the pixels of other colors. The display areas 41 and 49 of the display elements included in the blue pixel extend to an area where no pixels of any color are provided. Figure 23D The same applies to the display region 41 of the display element included in the blue pixel and the display region 41 of the display element included in the pixels of other colors. Figure 23D The display region 49 of the display element included in the blue pixel may have the same area as the display region 49 of the display element included in the pixels of other colors.

[0293] As described above, in one embodiment of the present invention, the arrangement of pixels (pixel circuits) and the arrangement of the display region of the display element do not necessarily need to coincide with each other, and various layouts can be employed.

[0294] <Other Structural Examples of Display Devices>

[0295] Figure 24A A perspective view showing the display surface side of the display device 12 is shown. Figure 24B A perspective view showing the side of the display device 12 opposite to the display surface side is shown. Figure 24A and Figure 24B The illustrated display device 12 includes four display panels 100 (two in the vertical direction and two in the horizontal direction) arranged in a 2×2 matrix. Figure 24A and Figure 24B An example of electrical connection between each display panel and the FPC is shown.

[0296] The display device 12 can use various display panels described in this embodiment. Figure 24A and Figure 24B The display panel (equivalent to Figure 9A However, a display panel including the display area 109 (equivalent to Figure 6A wait).

[0297] At least a portion of the display device 12 is flexible. At least a portion of the display panel 100 is flexible. As the display element of the flexible display panel 100, an organic EL element is preferably used.

[0298] By using the display panel 100 having flexibility, such as Figure 24A and Figure 24BAs shown, the area near the FPC 112a of the display panel 100a can be bent, and a portion of the display panel 100a and a portion of the FPC 112a can be arranged on the lower side of the display area 101b of the display panel 100b adjacent to the FPC 112a. As a result, the FPC 112a and the back surface of the display panel 100b can be physically prevented from interfering with each other. In addition, when the display panel 100a and the display panel 100b are overlapped and fixed, since the thickness of the FPC 112a does not need to be considered, the height difference between the top surface of the area 110b that allows visible light to pass and the top surface of the display panel 100a can be reduced. As a result, the end of the display panel 100b located on the display area 101a can be prevented from being recognized.

[0299] Furthermore, by making each display panel 100 flexible, the display panel 100b can be gently bent so that the top surface height of the display area 101b of the display panel 100b is aligned with the top surface height of the display area 101a of the display panel 100a. This allows the heights of the display areas to be aligned, except near the overlapping area between the display panels 100a and 100b, thereby improving the display quality of the image displayed in the display area 13 of the display device 12.

[0300] Although the relationship between the display panel 100 a and the display panel 100 b is described above as an example, the relationship between any two adjacent display panels is also the same.

[0301] To minimize the step between two adjacent display panels 100, the display panels 100 are preferably thin. For example, the thickness of the display panel 100 is preferably 1 mm or less, more preferably 300 μm or less, and even more preferably 100 μm or less. A thin display panel is preferred because it can reduce the overall thickness or weight of the display device.

[0302] Figure 25A Viewed from the display side Figure 24A and Figure 24B A top view of the display device 12 is shown.

[0303] Here, the visible light-transmitting region 110 of the display panel 100 reflects or absorbs a significant amount of visible light. Therefore, in the display of the display panel 100 positioned below, a difference in brightness (lightness) may occur between portions that are visible through the visible light-transmitting region 110 and portions that are not visible through this region. Furthermore, the brightness (lightness) of the displayed image decreases as the number of display panels 100 overlapping the display region 101 decreases.

[0304] For example, in Figure 25AIn region A, one display panel 100c overlaps the display region 101a of the display panel 100a. In region B, two display panels 100, display panels 100c and 100d, overlap the display region 101b of the display panel 100b. In region C, three display panels 100, display panels 100b, 100c, and 100d, overlap the display region 101a of the display panel 100a.

[0305] In this case, it is preferable to perform correction on the displayed image data to locally increase the grayscale of pixels according to the number of display panels 100 overlapping the display area 101. This can suppress degradation in the display quality of the image displayed in the display area 13 of the display device 12. Alternatively, the brightness of the pixels can be adjusted by adjusting the data voltage supplied by the driver circuit.

[0306] Furthermore, by shifting the position of the end of the upper display panel 100 from the ends of other display panels 100 , the number of display panels 100 overlapping the display area 101 of the lower display panel 100 can be reduced.

[0307] Figure 25B The following illustrates a case where display panels 100c and 100d, which are arranged on display panels 100a and 100b, are offset in one direction. Specifically, display panels 100c and 100d are offset relative to display panels 100a and 100b in the positive X direction by a distance corresponding to the width W1 of the visible light-transmitting region 110. In this case, there is a region D where one display panel 100 overlaps on display region 101, and a region E where two display panels 100 overlap on display region 101.

[0308] Alternatively, the display panels may be shifted in a direction (Y direction) perpendicular to the X direction. Figure 25C The display panel 100 b and the display panel 100 d are shifted relative to the display panel 100 a and the display panel 100 c in the positive direction of the Y direction by a distance corresponding to the width W1 of the region 110 that transmits visible light.

[0309] When the display panel 100 located at the top is staggered relative to the display panel 100 located at the bottom, the outline of the display area 101 of each display panel 100 is different from a rectangular shape. Figure 25B and Figure 25CWhen the display area 13 of the display device 12 is set to a rectangular shape as shown, it is preferable to drive the display device 12 so that no image is displayed in the display area 101 of the display panel 100 located outside the rectangular shape. In the display area 101 of the display panel 100, considering the number of pixels in the area where no image is displayed, it is preferable to provide a number of pixels greater than the total number of pixels in the display area 13 divided by the number of display panels 100.

[0310] In the above content, although the distance when each display panel 100 is relatively staggered is set to an integer multiple of the width W1 of the area 110 through which visible light is transmitted, it is not limited to this and can be appropriately set according to the shape of the display panel 100 or the shape of the display area 13 of the display device 12 combined with it.

[0311] 26A to 27D An example of a cross-sectional view when two display panels are bonded together is shown below. Figure 4A The case of the display panel shown is described as an example.

[0312] exist Figures 26A to 26E In the figure, the lower display panel includes a display area 101a, an area 110a that allows visible light to pass through, and an area 120a that blocks visible light. The lower display panel is electrically connected to FPC112a. The upper display panel (display surface side) includes a display area 101b, an area 110b that allows visible light to pass through, and an area 120b that blocks visible light. The upper display panel is electrically connected to FPC112b. When using Figure 1A In the display panel shown, a display area 109a is provided between the display area 101a and the area 120a that blocks visible light.

[0313] Figure 26A In the illustrated example, the FPC 112 a is connected to the display surface (front surface) side of the lower display panel, and the FPC 112 b is connected to the display surface side of the upper display panel.

[0314] Here, when air exists between the visible light-transmitting area of ​​the upper display panel and the display area of ​​the lower display panel, a portion of the light extracted from the display area is reflected at the interface between the display area and the atmosphere, and at the interface between the atmosphere and the visible light-transmitting area, sometimes causing a decrease in display brightness. Consequently, light extraction efficiency decreases in the area where multiple display panels overlap. Furthermore, a difference in brightness occurs in the display area of ​​the lower display panel between the portion of the upper display panel that overlaps the visible light-transmitting area and the portion that does not overlap with this area, making it difficult for users to identify the seam between the display panels.

[0315] So, if Figure 26BAs shown, the display device preferably includes a light-transmitting layer 103 having a higher refractive index than air between the display area and the visible light-transmitting area. This prevents air from entering between the display area and the visible light-transmitting area, reduces interfacial reflection caused by the difference in refractive index, and suppresses uneven display or brightness within the display device.

[0316] The higher the visible light transmittance of the light-transmitting layer, the higher the light extraction efficiency of the display device. In the light-transmitting layer, the average transmittance of light in the wavelength range of 450 nm to 700 nm is preferably 80% or more, more preferably 90% or more.

[0317] The smaller the difference in refractive index between the light-transmitting layer and the layer in contact with the light-transmitting layer, the more light reflection can be suppressed, so it is preferred. For example, the refractive index of the light-transmitting layer can be higher than that of air, preferably 1.3 or more and 1.8 or less. The difference in refractive index between the light-transmitting layer and the layer in contact with the light-transmitting layer (for example, the substrate constituting the display panel) is preferably 0.30 or less, more preferably 0.20 or less, and even more preferably 0.15 or less.

[0318] The light-transmitting layer preferably removably contacts at least one of the lower display panel and the upper display panel. When the display panels that comprise the display device can be independently attached and detached, for example, if one display panel exhibits poor display, only the poorly displaying panel can be replaced with a new one. By continuing to use the remaining display panels, a long-life, low-cost display device can be achieved.

[0319] When the display panels do not need to be detachable, each display panel may be fixed using a material having adhesive properties (adhesive, etc.) as a light-transmitting layer.

[0320] As the light-transmitting layer, an inorganic material or an organic material can be used. As the light-transmitting layer, a liquid substance, a gel substance, or a solid substance can be used.

[0321] As the light-transmitting layer, for example, a liquid substance such as water, an aqueous solution, a fluorine-based inert liquid, a refractive liquid, or silicone oil can be used.

[0322] When the display device is arranged tilted relative to the horizontal plane (a plane perpendicular to the direction of gravity) or perpendicular to the horizontal plane, the viscosity of the liquid substance is preferably 1 mPa·s or greater, more preferably 1 Pa·s or greater, further preferably 10 Pa·s or greater, and particularly preferably 100 Pa·s or greater. Note that this is not limiting in cases such as when the display device is arranged parallel to the horizontal plane.

[0323] When the transmission layer is made of an inert material, damage to other layers constituting the display device can be suppressed, which is preferable.

[0324] The material contained in the light-transmitting layer is preferably a non-volatile material, thereby preventing air from entering the interface due to volatilization of the material used for the light-transmitting layer.

[0325] As the light-transmitting layer, a polymer material can be used. For example, resins such as epoxy resin, acrylic resin, silicone resin, phenolic resin, polyimide resin, imide resin, PVC (polyvinyl chloride) resin, PVB (polyvinyl butyral) resin, and EVA (ethylene-vinyl acetate) resin can be cited. In addition, a two-liquid mixed resin can also be used. In addition, various curing adhesives or bonding sheets such as ultraviolet curing adhesives, reaction curing adhesives, heat curing adhesives, and anaerobic adhesives containing any one or more of the above resins can also be used. In cases where it is not necessary to fix the display panel, the adhesive may not be cured.

[0326] The light-transmitting layer is preferably a layer having high self-adsorption properties to an object. In addition, the light-transmitting layer is preferably a layer having high releasability to an object. It is preferably capable of being reattached to the display panel after being peeled off from the light-transmitting layer adhered to the display panel.

[0327] Furthermore, the light-transmitting layer preferably has no adhesiveness or low adhesiveness, so that the light-transmitting layer can be repeatedly adsorbed onto and peeled off from an object without damaging or soiling the surface of the object.

[0328] As the light-transmitting layer, for example, a thin film having adsorptive properties or a thin film having adhesive properties can be used. One or both surfaces of the film have adsorptive properties or adhesive properties. In the case of using an adsorptive film having a laminated structure of an adsorptive layer or adhesive layer and a substrate, the adsorptive layer or adhesive layer can be used as the light-transmitting layer in the display device, and the substrate can be used as the substrate constituting the display panel. In addition, the display device may also include a substrate in addition to the substrate of the adsorptive film. The adsorptive film may also include a fixing layer between the adsorptive layer or adhesive layer and the substrate. The fixing layer has the function of increasing the bonding force between the adsorptive layer or adhesive layer and the substrate. In addition, the fixing layer has the function of smoothing the surface of the substrate to which the adsorptive layer or adhesive layer is applied. Therefore, it is possible to prevent bubbles from being generated between the object and the light-transmitting layer.

[0329] For example, a film composed of a laminated silicone resin layer and a polyester film can be suitably used in display devices. In this case, the silicone resin layer has adsorptive properties and serves as a light-transmitting layer. Alternatively, the polyester film serves as a light-transmitting layer or as a substrate for a display panel. The silicone resin is applied to one or both surfaces of the polyester film.

[0330] There are no particular limitations on the thickness of the light-transmitting layer. For example, it can be between 1 μm and 50 μm. While the thickness of the light-transmitting layer can be greater than 50 μm, when manufacturing a flexible display device, the thickness of the light-transmitting layer is preferably such that it does not impair the flexibility of the display device. For example, the thickness of the light-transmitting layer is preferably between 10 μm and 30 μm. Alternatively, the thickness of the light-transmitting layer can be less than 1 μm.

[0331] The display region 101a overlaps the visible light transmitting region 110b via the light-transmitting layer 103. This prevents air from entering between the display region 101a and the visible light transmitting region 110b, and reduces interface reflection caused by the difference in refractive index.

[0332] Therefore, it is possible to suppress the difference in brightness of the display area 101a between the portion overlapping the visible light-transmitting region 110b and the portion not overlapping the region 110b, thereby making it difficult for a user of the display device to recognize the joints between the display panels. Furthermore, it is possible to suppress unevenness in the display or brightness of the display device.

[0333] The visible light shielding region 120a and the FPC 112a both overlap the display region 101b. Therefore, the non-display area can be sufficiently secured and the display region can be increased in size without any seams, thereby realizing a large display device with high reliability.

[0334] Figure 26C In the example shown, the FPC 112 a is connected to the side opposite to the display surface (back surface) of the lower display panel, and the FPC 112 b is connected to the side opposite to the display surface (back surface) of the upper display panel.

[0335] exist Figure 26C In the embodiment, the light-transmitting layer 103 is further provided between the visible light shielding region 120 a of the lower display panel and the display region 101 b of the upper display panel.

[0336] By adopting a structure in which the FPC is connected to the back side of the display panel, the end of the lower display panel can be attached to the back side of the upper display panel, thereby expanding their bonding area and improving the mechanical strength of the attached part.

[0337] exist Figure 26D In the embodiment, the area of ​​the display region 101 a that does not overlap with the upper display panel overlaps with the light-transmitting layer 103 . Furthermore, the area 110 a that transmits visible light overlaps with the light-transmitting layer 103 .

[0338] Depending on the material of the light-transmitting layer, fine particles such as dust in the atmosphere may be adsorbed. In such cases, the area of ​​the display region 101a that does not overlap with the upper display panel preferably does not overlap with the light-transmitting layer 103. This prevents the display device from becoming unclear due to dust adhering to the light-transmitting layer 103.

[0339] exist Figure 26E In the embodiment, the area of ​​the upper display panel that does not overlap with the display area 101 a overlaps with the light-transmitting layer 103 .

[0340] exist Figure 26E In this structure, since the light-transmitting layer is not located on the outermost surface on the display surface side of the display device, it is possible to prevent the display of the display device from becoming unclear due to dust or the like adhering to the light-transmitting layer 103. In addition, when a light-transmitting layer having adsorptive properties is provided on the back surface of the display device, the display device can be detachably attached to a desired position using the surface that does not contact the display panel.

[0341] exist Figure 27A In the embodiment, the resin layer 131 covers the surfaces of the display panels 100a and 100b. The resin layer 131 is preferably provided to cover the display areas of the display panels 100a and 100b and the overlapping area of ​​the display panels 100a and 100b.

[0342] By providing the resin layer 131 on the plurality of display panels 100, the mechanical strength of the display device 12 can be improved. Furthermore, by making the surface of the resin layer 131 flat, the display quality of the image displayed in the display area 13 can be improved. For example, a highly flat resin layer 131 can be formed using a coating device such as a slit coater, curtain coater, gravure coater, roll coater, or spin coater.

[0343] The refractive index of the resin layer 131 is preferably 0.8 times or more and 1.2 times or less of the refractive index of the substrate on the display surface side of the display panel 100, more preferably 0.9 times or more and 1.1 times or less, and even more preferably 0.95 times or more and 1.15 times or less. When the difference in refractive index between the display panel 100 and the resin layer 131 is small, light can be efficiently extracted to the outside. In addition, by providing the resin layer 131 having such a refractive index so as to cover the stepped portion between the display panels 100a and 100b, the stepped portion becomes less visible, thereby improving the display quality of the image displayed in the display area 13.

[0344] The resin layer 131 is a layer that transmits visible light. As the resin layer 131, for example, an organic resin such as epoxy resin, aramid resin, acrylic resin, polyimide resin, polyamide resin, or polyamide-imide resin can be used.

[0345] In addition, if Figure 27B As shown, a protective substrate 132 is preferably provided on the display device 12 via a resin layer 131. In this case, the resin layer 131 may also function as a bonding layer for bonding the display device 12 and the protective substrate 132. The protective substrate 132 not only protects the surface of the display device 12 but also improves the mechanical strength of the display device 12. A light-transmitting material is used for the protective substrate 132, at least in the region overlapping with the display area 13. Furthermore, the protective substrate 132 may have light-shielding properties to prevent visibility in areas other than the region overlapping with the display area 13.

[0346] The protective substrate 132 may have a touch panel function. When the display panel 100 is flexible and bendable, it is preferable that the protective substrate 132 also be flexible.

[0347] The difference in refractive index between the protective substrate 132 and the substrate or resin layer 131 used for the display surface side of the display panel 100 is preferably 20% or less, more preferably 10% or less, and even more preferably 5% or less.

[0348] A film-like plastic substrate can be used as the protective substrate 132. For example, polyester resins such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), polyacrylonitrile resins, polyimide resins, polymethyl methacrylate resins, polycarbonate (PC) resins, polyethersulfone (PES) resins, polyamide resins (nylon, aramid, etc.), polycycloolefin resins, polystyrene resins, polyamide-imide resins, polyvinyl chloride resins, polyetheretherketone (PEEK) resins, polysulfone (PSF) resins, polyetherimide (PEI) resins, polyarylate (PAR) resins, polybutylene terephthalate (PBT) resins, polytetrafluoroethylene (PTFE) resins, or silicone resins can be used. Alternatively, a substrate in which a fiber body is impregnated with a resin (also called a prepreg) or a substrate in which an inorganic filler is mixed with an organic resin to reduce the linear expansion coefficient can be used. In addition, the protective substrate 132 is not limited to a resin film, and a transparent non-woven fabric processed into a continuous sheet shape by processing pulp, a sheet of artificial spider silk fibers containing a protein called fibroin, a composite of a mixture of the transparent non-woven fabric or the sheet and a resin, a laminate of a non-woven fabric composed of cellulose fibers having a fiber width of 4 nm or more and 100 nm or less and a resin film, or a laminate of a sheet containing artificial spider silk fibers and a resin film can also be used. In addition, the display device or display panel of one embodiment of the present invention can also be attached to an acrylic plate, a glass plate, a wooden board, a metal plate, etc. The display surface side of the display device or display panel can be attached to the above-mentioned plate (in this case, a plate that allows visible light to pass through is used), or the side opposite to the display surface can be attached to the above-mentioned plate. In addition, the display device or display panel is preferably detachably attached to the above-mentioned plate.

[0349] Alternatively, as the protective substrate 132 , at least one of a polarizing plate, a circularly polarizing plate, a phase difference plate, an optical film, and the like may be used.

[0350] In addition, if Figure 27C As shown, a resin layer 133 and a protective substrate 134 can be provided on the surface opposite to the display surface of the display panels 100a and 100b. By providing a substrate supporting the display panels on the back side of the display panels, unintended warping or bending of the display panels can be suppressed, and by making the display surface smooth, the display quality of the image displayed in the display area 13 can be improved.

[0351] Note that the resin layer 133 and the protective substrate 134 provided on the side opposite to the display surface do not necessarily need to be light-transmitting, and materials that absorb or reflect visible light may be used.

[0352] In addition, if Figure 27DAs shown, a resin layer 131 and a protective substrate 132 can be provided on the surface of the display panel, and a resin layer 133 and a protective substrate 134 can be provided on the back of the display panel. In this way, by sandwiching the display panels 100a and 100b with two protective substrates, the mechanical strength of the display device 12 can be further improved.

[0353] Furthermore, the combined thickness of the resin layer 131 and the protective substrate 132 is preferably approximately equal to the combined thickness of the resin layer 133 and the protective substrate 134. For example, the thicknesses of the resin layer 131 and the resin layer 133 are preferably equal, and the protective substrate 132 and the protective substrate 134 are preferably made of the same thickness. This allows for the placement of multiple display panels 100 in the center of the thickness of the laminate. For example, when the laminate including the display panels 100 is bent, the lateral stress applied to the display panels 100 due to the display panels 100 being located in the center of the thickness is mitigated, thereby preventing damage to the display panels 100.

[0354] In cases where the thickness of the resin layer and the protective substrate is different between the end and center parts of the display device, it is preferable to appropriately select the average thickness, maximum thickness, minimum thickness, etc. and compare the total thickness of the resin layer 131 and the protective substrate 132 and the total thickness of the resin layer 133 and the protective substrate 134 under the same conditions.

[0355] exist Figure 27D In the embodiment, it is preferable to use the same material for the resin layer 131 and the resin layer 133 because this can reduce manufacturing costs. Similarly, it is preferable to use the same material for the protective substrate 132 and the protective substrate 134 because this can reduce manufacturing costs.

[0356] In addition, if Figure 27C and Figure 27D As shown in FIG. 1 , it is preferable to provide an opening for taking out the FPC 112a in the resin layer 133 and the protective substrate 134 disposed on the back side of the display panel 100a and the display panel 100b. Figure 27D As shown, if the resin layer 133 is provided so as to cover a portion of the FPC 112a, the mechanical strength of the connection between the display panel 100a and the FPC 112a can be improved, thereby suppressing adverse effects such as peeling of the FPC 112a. Similarly, the resin layer 133 is preferably provided so as to cover a portion of the FPC 112b.

[0357] The display device of one embodiment of the present invention preferably has a high resolution such as FHD (1920×1080), 4K2K (3840×2048 or 4096×2180), or 8K4K (7680×4320 or 8192×4320).

[0358] <Structural Example of Display Panel>

[0359] As described above, in display panel 100, region 110 that transmits visible light is adjacent to display region 101. Furthermore, display region 109 is located between and adjacent to display region 101 and region 120 that blocks visible light. The structure near the boundary between these regions is described below.

[0360] Figure 28A A top view of the display panel 100 is shown. Figure 28A The display panel 100 shown includes a display region 101, a display region 109, and a region 102. Region 102 includes a region 110 that transmits visible light and a region 120 that blocks visible light. Region 110 that transmits visible light is adjacent to display region 101. Display region 109 is located between display region 101 and region 120 that blocks visible light, and is adjacent to both.

[0361] exist Figure 28A In the display panel 100 shown, regions 110 that transmit visible light are arranged along two sides of the display region 101. Furthermore, a display region 109 is arranged along the other two sides of the display region 101. The region 110 that transmits visible light is arranged along one of the two opposing sides of the display region 101, and the display region 109 is arranged along the other side. Furthermore, a region 120 that blocks visible light is arranged along the display region 109.

[0362] Figure 28B Show Figure 28A An enlarged view of region Z1 is shown. Region Z1 is an area near the boundary between the visible light shielding region 120 and the display region 109.

[0363] Figure 28C Show Figure 28A The enlarged view of the region Z2 is shown. The region Z2 is a region near the boundary between the region 110 that transmits visible light and the display region 101.

[0364] One pixel 141 is electrically connected to wiring 142a and wiring 142b. One pixel 149 is electrically connected to wiring 142a and wiring 142b. Each of the plurality of wirings 142a intersects with wiring 142b and is electrically connected to circuit 143a. Furthermore, the plurality of wirings 142b is electrically connected to circuit 143b. One of circuits 143a and 143b is a scan line driver circuit, and the other is a signal line driver circuit. Alternatively, circuit 143a or circuit 143b, or both, may not be provided.

[0365] exist Figure 28BIn the circuit 143a or the circuit 143b, a plurality of wirings 145 are provided that are electrically connected to the FPC in a region not shown, and supply external signals to the circuit 143a and the circuit 143b.

[0366] exist Figure 28B In FIG. 1 , a region including the circuit 143 a , the circuit 143 b , and the plurality of wirings 145 corresponds to the region 120 that blocks visible light.

[0367] exist Figure 28A In the example, the area outside the outermost pixel 141 corresponds to the visible light-transmitting area 110. The visible light-transmitting area 110 does not include components that block visible light, such as the pixel 141, the wiring 142a, and the wiring 142b. Furthermore, if a portion of the pixel 141, the wiring 142a, or the wiring 142b transmits visible light, they may extend into the visible light-transmitting area 110.

[0368] Figure 28D It is along Figure 28C 14. A cross-sectional view taken along line A1-A2 in FIG. The display panel 100 includes a pair of substrates (substrate 151 and substrate 152) that transmit visible light. Substrate 151 and substrate 152 are bonded together by a bonding layer 154. Here, the substrate on which the pixels 141 and wiring 142b are formed is referred to as substrate 151.

[0369] like Figure 28C and Figure 28D As shown, when the pixel 141 is located at the outermost end of the display area 101 , the width W1 of the region 110 that transmits visible light is equivalent to the length from the end of the substrate 151 or the substrate 152 to the end of the pixel 141 .

[0370] Note that the end of the pixel 141 refers to the end of the outermost member of the member that blocks visible light included in the pixel 141. Alternatively, when the pixel 141 includes a light-emitting element having a layer containing a light-emitting material between a pair of electrodes, the end of the pixel 141 may be any one of the end of the lower electrode, the end of the layer containing the light-emitting material, and the end of the upper electrode.

[0371] Figure 29A This is an example of a top view of the enlarged region Z2. The position of the wiring 142a is Figure 28C different. Figure 29B Shown along Figure 29A The cross-sectional view along the dot-dash line B1-B2 in FIG. Figure 29C Shown along Figure 29A Cross-sectional view along the dotted line C1-C2 in FIG.

[0372] like Figures 29A to 29CAs shown, when wiring 142a is located at the outermost end of display area 101, width W1 of visible light-transmitting region 110 corresponds to the length from the end of substrate 151 or substrate 152 to the end of wiring 142a. When wiring 142a transmits visible light, visible light-transmitting region 110 may also include the region where wiring 142a is provided.

[0373] As described above, a display device according to one embodiment of the present invention includes two overlapping display panels. The display area of ​​the lower display panel overlaps with the area of ​​the upper display panel that allows visible light to pass on the side of the display surface. In the display panel, the area of ​​the display element included in the pixel closest to the area that blocks visible light is larger than the area of ​​the display element included in other pixels. Alternatively, in the display panel, a display area including a dummy pixel is provided between the area that blocks visible light and the display area. The color of the dummy pixel is the same as the color of the pixel closest to the dummy pixel in the display area. The gate signal and the source signal supplied to the dummy pixel are equal to the gate signal and the source signal supplied to the pixel closest to the dummy pixel in the display area. Thus, when the display panels are misaligned in the direction in which the two display panels are separated from each other, it is possible to prevent the image from appearing to be disconnected near the boundary between the two display panels. In addition, it is possible to prevent the user from easily recognizing the seam of the display panels.

[0374] This embodiment can be combined with other embodiments as appropriate.

[0375] Implementation Method 2

[0376] In this embodiment, a display panel that can be used in a display device according to one embodiment of the present invention is described with reference to the drawings.

[0377] In this embodiment mode, a display panel using EL elements as display elements is described as an example.

[0378] The display panel may have a structure in which three sub-pixels of R (red), G (green), and B (blue) represent one color; a structure in which four sub-pixels of R, G, B, and W (white) represent one color; or a structure in which four sub-pixels of R, G, B, and Y (yellow) represent one color. There is no particular limitation on the color elements, and colors other than RGBWY (for example, cyan or magenta) may also be used.

[0379] <Structure Example 1>

[0380] Figure 30A and Figure 30B A top view of the display panel 370 is shown.

[0381] Figure 30A and Figure 30B The display panels 370 shown include a region 110 that transmits visible light, a display portion 381 , and a driving circuit portion 382 . Figure 30A An example is shown in which the region 110 that transmits visible light is adjacent to the display portion 381 and is arranged along two sides of the display portion 381 . Figure 30B An example is shown in which the region 110 that transmits visible light is adjacent to the display portion 381 and is arranged along three sides of the display portion 381 .

[0382] Figure 30C FIG. 3 shows a cross-sectional view of a display panel 370 that adopts a color filter method and has a top emission structure. Figure 30C Equivalent to following Figure 30A and Figure 30B A cross-sectional view taken along the dot-dash line A1-A2 and the dot-dash line A3-A4.

[0383] Display panel 370 includes a flexible substrate 371, an adhesive layer 377, an insulating layer 378, a plurality of transistors, a capacitor 305, a conductive layer 307, an insulating layer 312, an insulating layer 313, an insulating layer 314, an insulating layer 315, a light-emitting element 304, a conductive layer 355, a spacer 316, an adhesive layer 317, a colored layer 325, a light-shielding layer 326, a flexible substrate 372, an adhesive layer 375, and an insulating layer 376. Each layer included in region 110 transmitting visible light transmits visible light.

[0384] The driver circuit portion 382 includes a transistor 301. The display portion 381 includes a transistor 302 and a transistor 303.

[0385] Each transistor includes a gate, a gate insulating layer 311, a semiconductor layer, a source, and a drain. The gate overlaps the semiconductor layer with the gate insulating layer 311 interposed therebetween. A portion of the gate insulating layer 311 serves as a dielectric for the capacitor 305. The conductive layer used as the source or drain of the transistor 302 also serves as one electrode of the capacitor 305.

[0386] Figure 30C The bottom-gate transistor is shown. The driver circuit portion 382 and the display portion 381 may have different transistor structures. The driver circuit portion 382 and the display portion 381 may also include multiple types of transistors.

[0387] Capacitor 305 includes a pair of electrodes and a dielectric therebetween. Capacitor 305 includes a conductive layer formed using the same material and process as a gate of a transistor and a conductive layer formed using the same material and process as a source and drain of a transistor.

[0388] Insulating layer 312, insulating layer 313, and insulating layer 314 each cover transistors, etc. There is no particular limit on the number of insulating layers covering transistors, etc. Insulating layer 314 serves as a planarization layer. Preferably, at least one of insulating layer 312, insulating layer 313, and insulating layer 314 is made of a material that is not susceptible to diffusion of impurities such as water or hydrogen. This effectively prevents external impurities from diffusing into the transistors, thereby improving the reliability of the display panel.

[0389] When an organic material is used as the insulating layer 314, there is a concern that impurities such as moisture may enter the light-emitting element 304 from outside the display panel through the insulating layer 314 exposed at the end of the display panel. Deterioration of the light-emitting element 304 due to the entry of impurities may cause degradation of the display panel. Figure 30C As shown, it is preferable to provide an opening in the insulating layer 314 that reaches the inorganic film (here, the insulating layer 313 ) so that the display panel has a structure in which impurities such as moisture do not easily reach the light-emitting element 304 even if they enter from outside the display panel.

[0390] Figure 34A 1 is a cross-sectional view showing a case where the above-mentioned opening is not provided in the insulating layer 314. Figure 34A By providing the insulating layer 314 on the entire display panel as shown, the yield of the peeling step described later can be improved.

[0391] Figure 34B A cross-sectional view showing an end portion where the insulating layer 314 is not located on the display panel. Figure 34B In the structure, since the insulating layer made of an organic material is not located at the end portion of the display panel, it is possible to suppress the entry of impurities into the light-emitting element 304.

[0392] The light-emitting element 304 includes an electrode 321, an EL layer 322, and an electrode 323. The light-emitting element 304 may also include an optical adjustment layer 324. The light-emitting element 304 emits light toward the coloring layer 325 side.

[0393] By arranging transistors, capacitors, wiring, and the like so as to overlap with the light-emitting region of the light-emitting element 304 , the aperture ratio of the display portion 381 can be increased.

[0394] One of the electrode 321 and the electrode 323 functions as an anode, and the other functions as a cathode. When a voltage higher than the threshold voltage of the light-emitting element 304 is applied between the electrode 321 and the electrode 323, holes are injected from the anode side and electrons are injected from the cathode side into the EL layer 322. The injected electrons and holes recombine in the EL layer 322, causing the light-emitting substance contained in the EL layer 322 to emit light.

[0395] The electrode 321 is electrically connected to the source or drain of the transistor 303. These components are directly connected together or connected to each other through other conductive layers. The electrode 321 is used as a pixel electrode and is provided in each light-emitting element 304. Two adjacent electrodes 321 are electrically insulated by the insulating layer 315.

[0396] The EL layer 322 is a layer containing a light-emitting material. As the light-emitting element 304, an organic EL element using an organic compound as a light-emitting material can be suitably used.

[0397] The EL layer 322 includes at least one light-emitting layer. The EL layer 322 may also include multiple light-emitting layers. As layers other than the light-emitting layer, the EL layer 322 may further include layers containing a substance with a high hole-injecting property, a substance with a high hole-transporting property, a hole-blocking material, a substance with a high electron-transporting property, a substance with a high electron-injecting property, or a bipolar substance (a substance with high electron-transporting and hole-transporting properties).

[0398] The EL layer 322 can be made of a low molecular weight compound or a high molecular weight compound, and may also contain an inorganic compound. The layers constituting the EL layer 322 are formed by methods such as vapor deposition (including vacuum vapor deposition), transfer, printing, inkjet, and coating.

[0399] The light-emitting element 304 may also include two or more light-emitting substances. Thus, for example, a light-emitting element that emits white light can be realized. For example, by selecting the light-emitting substances in such a way that the light emitted by the two or more light-emitting substances is in a complementary color relationship, white light emission can be obtained. For example, a light-emitting substance that emits light of R (red), G (green), B (blue), Y (yellow) or O (orange) or a light-emitting substance that emits light with a spectral component containing two or more colors of R, G and B can be used. For example, a light-emitting substance that emits blue light and a light-emitting substance that emits yellow light can also be used. In this case, the light emission spectrum of the light-emitting substance that emits yellow light preferably includes spectral components of green and red. In addition, the light emission spectrum of the light-emitting element 31 preferably has two or more peaks within the wavelength range of the visible region (for example, greater than 350 nm and less than 750 nm, or greater than 400 nm and less than 800 nm, etc.).

[0400] Alternatively, the light-emitting element 304 may be a single element including a single EL layer, or a tandem element including a plurality of EL layers stacked with a charge-generating layer interposed therebetween.

[0401] As the light-emitting material, inorganic compounds such as quantum dots can also be used. Quantum dots are semiconductor nanocrystals with a size of several nm and contain 1×10 3 to 1×10 6The energy transfer of quantum dots depends on their size. Therefore, even quantum dots made of the same substance have different emission wavelengths depending on their size. Therefore, by changing the size of the quantum dots used, the emission wavelength can be easily changed.

[0402] Furthermore, quantum dots have a narrow peak width in their emission spectrum, resulting in high-color-purity luminescence. Furthermore, the theoretical internal quantum efficiency of quantum dots is believed to be approximately 100%, making it possible to produce light-emitting devices with high luminescence efficiency by using them as luminescent materials. Furthermore, quantum dots, as inorganic compounds, are also highly stable, enabling the production of long-life light-emitting devices.

[0403] As materials constituting quantum dots, there can be cited elements of Group 14 in the periodic table, elements of Group 15 in the periodic table, elements of Group 16 in the periodic table, compounds containing multiple elements of Group 14 in the periodic table, compounds of elements of Group 4 to Group 14 in the periodic table and elements of Group 16 in the periodic table, compounds of elements of Group 2 in the periodic table and elements of Group 16 in the periodic table, compounds of elements of Group 13 in the periodic table and elements of Group 15 in the periodic table, compounds of elements of Group 13 in the periodic table and elements of Group 17 in the periodic table, compounds of elements of Group 14 in the periodic table and elements of Group 15 in the periodic table, compounds of elements of Group 11 in the periodic table and elements of Group 17 in the periodic table, iron oxides, titanium oxides, chalcogenides, various semiconductor clusters, and the like.

[0404] Examples of materials that constitute quantum dots include cadmium selenide, cadmium sulfide, cadmium telluride, zinc sulfide, indium phosphide, lead selenide, lead sulfide, compounds of selenium-zinc-cadmium, and compounds of cadmium-selenium-sulfur. Furthermore, so-called alloy-type quantum dots, whose compositions are expressed in arbitrary ratios, can also be used. For example, alloy-type quantum dots of cadmium-selenium-sulfur (CdS) are effective for producing blue light, as their emission wavelength can be altered by varying the elemental ratios.

[0405] Quantum dot structures include core-type, core-shell, and core-multishell types, and any of these can be used. Core-shell or core-multishell quantum dots are preferred, as they can significantly improve the quantum efficiency of luminescence. Examples of shell materials include zinc sulfide and zinc oxide.

[0406] Examples of quantum dot materials include colloidal quantum dot materials, alloy quantum dot materials, core-shell quantum dot materials, and core-type quantum dot materials. Quantum dot materials may also contain elements such as cadmium (Cd), selenium (Se), zinc (Zn), sulfur (S), phosphorus (P), indium (In), tellurium (Te), lead (Pb), gallium (Ga), arsenic (As), and aluminum (Al).

[0407] Quantum dots have a high proportion of surface atoms, resulting in high reactivity and a tendency to aggregate. Therefore, it is preferable to attach a protective agent or provide a protecting group to the surface of the quantum dots. This prevents quantum dot aggregation and improves solvent solubility. Furthermore, by reducing reactivity, electrical stability can be improved.

[0408] The size (diameter) of commonly used quantum dots is between 0.5 nm and 20 nm, preferably between 1 nm and 10 nm. Furthermore, the smaller the size distribution of the quantum dots, the narrower the emission spectrum, thereby achieving high color purity. Furthermore, there are no particular limitations on the shape of the quantum dots, which may be spherical, rod-shaped, disc-shaped, or other shapes.

[0409] Even when quantum dots are used alone without a host material to form a light-emitting layer, luminous efficiency can be ensured, thereby enabling a light-emitting element with a long life. When quantum dots are used alone to form a light-emitting layer, the quantum dots preferably have a core-shell structure (including a core-multishell structure).

[0410] The electrode 323 serves as a common electrode and is arranged across the plurality of light emitting elements 304. A constant potential is supplied to the electrode 323.

[0411] The light emitting element 304 overlaps with the coloring layer 325 via the adhesive layer 317. The spacer 316 overlaps with the light shielding layer 326 via the adhesive layer 317. Figure 30C Although a gap is shown between the light emitting element 304 and the light shielding layer 326, they may be in contact with each other. Figure 30C Although the structure in which the spacer 316 is provided on the flexible substrate 371 side is shown, the spacer 316 may be provided on the flexible substrate 372 side (for example, on the side closer to the flexible substrate 371 than the light shielding layer 326 ).

[0412] By combining a color filter (colored layer 325) with a microcavity structure (optical adjustment layer 324), light with high color purity can be extracted from the display panel. The thickness of the optical adjustment layer 324 is changed according to the color of each pixel.

[0413] The colored layer is a colored layer that transmits light in a specific wavelength range. For example, a color filter that transmits light in the red, green, blue, or yellow wavelength range can be used. Examples of materials that can be used for the colored layer include metal materials, resin materials, and resin materials containing pigments or dyes.

[0414] Furthermore, one embodiment of the present invention is not limited to the color filter method, and a separate coating method, a color conversion method, a quantum dot method, or the like may be employed.

[0415] The light-shielding layer is provided between adjacent coloring layers. The light-shielding layer blocks the light emitted by adjacent light-emitting elements, thereby suppressing color mixing between adjacent light-emitting elements. Here, by arranging the coloring layer in such a manner that its ends overlap with the light-shielding layer, light leakage can be suppressed. The light-shielding layer can be made of a material that blocks the light emission of the light-emitting elements, for example, a black matrix can be formed using a metal material, a resin material containing a pigment or a dye, etc. In addition, by arranging the light-shielding layer in an area outside the pixel portion such as a driving circuit, unintentional light leakage caused by waveguide light, etc., can be suppressed, so it is preferred.

[0416] like Figure 34A As shown, the display panel preferably includes a protective layer 329. Protective layer 329 prevents impurities contained in the colored layer 325 from diffusing into the light-emitting element 304. Protective layer 329 is made of a material that transmits light from the light-emitting element 304. For example, an inorganic insulating film such as a silicon nitride film or a silicon oxide film, or an organic insulating film such as an acrylic resin film or a polyimide film can be used. A stacked structure of organic and inorganic insulating films can also be used.

[0417] Furthermore, when the material of the adhesive layer 317 is applied onto the colored layer 325 and the light-shielding layer 326, a material having high wettability with the material of the adhesive layer 317 is preferably used as the material of the protective layer 329. For example, a conductive oxide film such as an indium tin oxide (ITO) film or a metal film such as an Ag film thin enough to be light-transmitting is preferably used as the protective layer 329.

[0418] By using a material having high wettability with the material of the adhesive layer 317 as the material of the protective layer 329, the material of the adhesive layer 317 can be uniformly applied. This prevents air bubbles from being introduced when the pair of substrates are bonded together, thereby preventing display defects.

[0419] Insulating layer 378 and flexible substrate 371 are bonded together by adhesive layer 377. Furthermore, insulating layer 376 and flexible substrate 372 are bonded together by adhesive layer 375. Highly moisture-resistant films are preferably used for insulating layers 376 and 378. Placing light-emitting element 304, transistors, and the like between a pair of highly moisture-resistant insulating layers is preferred because it prevents impurities such as water from entering these elements, thereby improving the reliability of the display panel.

[0420] Examples of highly moisture-resistant insulating films include films containing nitrogen and silicon, such as silicon nitride films and silicon oxynitride films, and films containing nitrogen and aluminum, such as aluminum nitride films. Silicon oxide films, silicon oxynitride films, and aluminum oxide films may also be used.

[0421] For example, the water vapor permeability of a highly moisture-proof insulating film is 1×10 -5 [g / (m 2 ·day)] or less, preferably 1×10 -6 [g / (m 2 ·day)] or less, more preferably 1×10 -7 [g / (m 2 ·day)] or less, more preferably 1×10 -8 [g / (m 2 ·day)] or below.

[0422] Connecting portion 306 includes conductive layer 307 and conductive layer 355. Conductive layer 307 is electrically connected to conductive layer 355. Conductive layer 307 can be formed using the same material and process as the source and drain of the transistor. Conductive layer 355 is electrically connected to an external input terminal that transmits an external signal or potential to driver circuit portion 382. Here, an example is shown in which an FPC 373 is provided as an external input terminal. FPC 373 and conductive layer 355 are electrically connected via connector 319.

[0423] As the connection body 319 , various anisotropic conductive films (ACF: Anisotropic Conductive Film) and anisotropic conductive pastes (ACP: Anisotropic Conductive Paste) can be used.

[0424] As the flexible substrate 371 and the flexible substrate 372, materials such as glass, quartz, resin, metal, alloy, semiconductor, etc. can be used, which have a thickness that allows flexibility. The substrate on the side that extracts light from the light-emitting element uses a material that allows the light to pass through. For example, the thickness of the flexible substrate is preferably greater than or equal to 1 μm and less than or equal to 200 μm, more preferably greater than or equal to 1 μm and less than or equal to 100 μm, further preferably greater than or equal to 10 μm and less than or equal to 50 μm, and even more preferably greater than or equal to 10 μm and less than or equal to 25 μm. The thickness and hardness of the flexible substrate are within the range that can achieve both mechanical strength and flexibility. The flexible substrate can have either a single-layer structure or a multi-layer structure.

[0425] Since the specific gravity of resin is lower than that of glass, the use of resin as the flexible substrate is preferable because the weight of the display panel can be made lighter than when glass is used as the flexible substrate.

[0426] A material with high toughness is preferably used as the substrate. This allows for a highly impact-resistant and durable display panel. For example, using a resin substrate, a thin metal substrate, or an alloy substrate allows for a lighter and more durable display panel compared to a glass substrate.

[0427] Metal and alloy materials are preferred because they have high thermal conductivity and easily conduct heat to the entire substrate, thereby suppressing local temperature increases in the display panel. The thickness of a substrate using a metal or alloy material is preferably 10 μm to 200 μm, more preferably 20 μm to 50 μm.

[0428] The material constituting the metal substrate or alloy substrate is not particularly limited, and for example, aluminum, copper, nickel, aluminum alloy, stainless steel, or other metal alloys are preferably used. Examples of the material constituting the semiconductor substrate include silicon.

[0429] Furthermore, using a material with high thermal emissivity as the substrate can suppress increases in the surface temperature of the display panel, thereby preventing damage to the display panel or a decrease in reliability. For example, the substrate may have a laminated structure comprising a metal substrate and a layer with high thermal emissivity (e.g., a metal oxide or ceramic material).

[0430] As materials with flexibility and light transmittance, for example, the following materials can be mentioned: polyester resins such as PET or PEN, polyacrylonitrile resins, acrylic resins, polyimide resins, polymethyl methacrylate resins, PC resins, PES resins, polyamide resins (nylon, aromatic polyamide, etc.), polysiloxane resins, cycloolefin resins, polystyrene resins, polyamide-imide resins, polyurethane resins, polyvinyl chloride resins, polyvinylidene chloride resins, polypropylene resins, PTFE resins, and ABS resins. In particular, materials with a low linear expansion coefficient are preferably used, for example, polyamide-imide resins, polyimide resins, polyamide resins, and PET are preferably used. In addition, a substrate in which a resin is impregnated in a fiber body, or a substrate in which an inorganic filler is mixed with the resin to reduce the linear expansion coefficient, etc. can also be used.

[0431] The flexible substrate can be a laminated structure, in which a layer using the above-mentioned material is stacked with at least one of a hard coating layer (for example, a silicon nitride layer, etc.) for protecting the surface of the device from damage, a layer of a material capable of dispersing pressure (for example, an aromatic polyamide resin layer, etc.), etc.

[0432] By adopting a structure including a glass layer as the flexible substrate, the barrier properties against water and oxygen can be improved, thereby providing a highly reliable display panel.

[0433] For example, a flexible substrate can be used in which a glass layer, an adhesive layer, and a resin layer are stacked from the side closest to the light-emitting element. The thickness of the glass layer is set to be greater than 20 μm and less than 200 μm, preferably greater than 25 μm and less than 100 μm. A glass layer of this thickness can simultaneously achieve high barrier properties to water and oxygen and flexibility. In addition, the thickness of the resin layer is set to be greater than 10 μm and less than 200 μm, preferably greater than 20 μm and less than 50 μm. By providing such a resin layer, breakage and cracks in the glass layer can be prevented, and the mechanical strength of the glass can be improved. By applying such a composite material of glass material and resin to a substrate, a flexible display panel with extremely high reliability can be achieved.

[0434] As the adhesive layer, various curable adhesives such as photocurable adhesives such as ultraviolet curable resins, reaction curable adhesives, heat curable adhesives, and anaerobic adhesives can be used. Alternatively, an adhesive sheet can be used.

[0435] In addition, a desiccant may also be included in the adhesive layer. For example, a substance that absorbs water by chemical adsorption, such as an alkaline earth metal oxide (calcium oxide or barium oxide, etc.) may be used. Alternatively, a substance that absorbs water by physical adsorption, such as zeolite or silica gel, may be used. When a desiccant is included in the resin, it can inhibit impurities such as moisture from invading the functional elements, thereby improving the reliability of the display panel, which is preferred.

[0436] Furthermore, by including a filler or light scattering member having a high refractive index in the adhesive layer, the light extraction efficiency of the light emitting element can be improved. For example, titanium oxide, barium oxide, zeolite, zirconium, etc. can be used.

[0437] As the light-emitting element, an element capable of self-luminescence can be used, and within its scope, an element whose brightness is controlled by current or voltage can be included. For example, a light-emitting diode (LED), an organic EL element, an inorganic EL element, etc. can be used. In addition, a display panel of one embodiment of the present invention can be formed using various display elements. For example, a display element using a liquid crystal element, an electrophoretic element, or a MEMS element can also be used.

[0438] The light-emitting element can be either a top-emitting element or a bottom-emitting element. A conductive film that transmits visible light is used as the electrode on the light-extracting side. Alternatively, a conductive film that reflects visible light is preferably used as the electrode on the side that does not extract light.

[0439] As a conductive film that allows visible light to pass through, for example, indium oxide, ITO, indium zinc oxide, zinc oxide (ZnO), ZnO doped with gallium, etc. can be used. In addition, it is also possible to use a metal material such as gold, silver, platinum, magnesium, nickel, tungsten, chromium, molybdenum, iron, cobalt, copper, palladium or titanium, an alloy containing these metal materials, or a nitride of these metal materials (for example, titanium nitride) to be thin enough to have light transmittance. In addition, a laminated film of the above materials can be used as a conductive film. For example, when a laminated film of an alloy of silver and magnesium and ITO is used, the conductivity can be improved, so it is preferred. In addition, graphene, etc. can also be used.

[0440] As a conductive film that reflects visible light, for example, metal materials such as aluminum, gold, platinum, silver, nickel, tungsten, chromium, molybdenum, iron, cobalt, copper or palladium or alloys containing these metal materials can be used. In addition, lanthanum, neodymium or germanium can be added to the above-mentioned metal materials or alloys. In addition, alloys containing aluminum (aluminum alloys) such as aluminum and titanium alloys, aluminum and nickel alloys, aluminum and neodymium alloys (Al-Ni-La), silver and copper alloys, silver and palladium and copper alloys (Ag-Pd-Cu, also known as APC), silver and magnesium alloys, etc. can be used. Alloys containing silver and copper have high heat resistance and are therefore preferred. In addition, by laminating a metal film or a metal oxide film in contact with the aluminum alloy film, the oxidation of the aluminum alloy film can be suppressed. As materials for the metal film and the metal oxide film, titanium, titanium oxide, etc. can be cited. In addition, the above-mentioned conductive film that allows visible light to pass through can also be laminated with a film composed of a metal material. For example, a laminated film of silver and ITO, a laminated film of an alloy of silver and magnesium and ITO, or the like can be used.

[0441] Each electrode can be formed by vapor deposition or sputtering, or can also be formed by a dispensing method such as an inkjet method, a printing method such as a screen printing method, or a plating method.

[0442] There are no particular restrictions on the structure of the transistors included in the display panel. For example, planar transistors, staggered transistors, or inversely staggered transistors may be used. Furthermore, top-gate or bottom-gate transistor structures may be used. Alternatively, gate electrodes may be provided above and below the channel.

[0443] There are no particular restrictions on the crystallinity of the semiconductor material used for the transistor, and an amorphous semiconductor or a crystalline semiconductor (a microcrystalline semiconductor, a polycrystalline semiconductor, a single crystal semiconductor, or a semiconductor having a crystalline region in part thereof) can be used. The use of a crystalline semiconductor is preferred because it can suppress the degradation of transistor characteristics.

[0444] There are no particular limitations on the semiconductor material used for the transistor. For example, Group 14 elements, compound semiconductors, or oxide semiconductors can be used for the semiconductor layer. Typically, a semiconductor containing silicon, a semiconductor containing gallium arsenide, or an oxide semiconductor containing indium can be used.

[0445] It is particularly preferred to use an oxide semiconductor as the semiconductor forming the channel of the transistor. It is particularly preferred to use an oxide semiconductor with a wider band gap than silicon. Using a semiconductor material with a wider band gap than silicon and a lower carrier density than silicon can reduce the off-state current of the transistor, so it is preferred.

[0446] For example, the oxide semiconductor preferably contains at least indium (In) or zinc (Zn). More preferably, it contains an oxide represented by In-M-Zn oxide (M is a metal such as Al, Ti, Ga, Ge, Y, Zr, Sn, La, Ce, Hf, or Nd).

[0447] CAAC-OS (C Axis Aligned Crystalline Oxide Semiconductor) is preferably used as the semiconductor material for transistors. Unlike amorphous materials, CAAC-OS has a low defect level density, which improves transistor reliability. Furthermore, because CAAC-OS lacks observable grain boundaries, stable and uniform films can be formed over large areas. Furthermore, CAAC-OS films are less susceptible to cracking due to the stress generated when bending flexible display devices.

[0448] CAAC-OS is a crystalline oxide semiconductor in which the c-axis of the crystal is oriented approximately perpendicular to the film surface. Oxide semiconductors have been shown to have various crystalline structures besides single crystal structures, such as nanocrystal (NC) structures, which are aggregates of nanometer-sized crystallites. The crystallinity of CAAC-OS is lower than that of single crystal structures but higher than that of NC structures.

[0449] CAAC-OS has c-axis alignment, where multiple particles (nanocrystals) are linked in the ab-plane direction, resulting in a distorted crystal structure. Therefore, CAAC-OS can also be referred to as an oxide semiconductor having CAA crystals (c-axis-aligned ab-plane-anchored crystals).

[0450] The insulating layer included in the display panel can be made of an organic insulating material or an inorganic insulating material. Examples of resins include acrylic resins, epoxy resins, polyimide resins, polyamide resins, polyimideamide resins, siloxane resins, benzocyclobutene resins, and phenolic resins. Examples of inorganic insulating films include silicon oxide films, silicon oxynitride films, silicon nitride oxide films, silicon nitride films, aluminum oxide films, hafnium oxide films, yttrium oxide films, zirconium oxide films, gallium oxide films, tantalum oxide films, magnesium oxide films, lanthanum oxide films, cerium oxide films, and neodymium oxide films.

[0451] The conductive layer included in the display panel can be a single-layer structure or a stacked-layer structure using metals such as aluminum, titanium, chromium, nickel, copper, yttrium, zirconium, molybdenum, silver, tantalum or tungsten, or alloys with these elements as main components. Alternatively, a light-transmitting conductive material such as indium oxide, ITO, indium oxide containing tungsten, indium zinc oxide containing tungsten, indium oxide containing titanium, ITO containing titanium, indium zinc oxide, ZnO, ZnO doped with gallium, or indium zinc oxide containing silicon can be used. In addition, semiconductors such as polycrystalline silicon or oxide semiconductors whose resistance is reduced by containing impurity elements or silicides such as nickel silicide can also be used. In addition, a film containing graphene can also be used. The film containing graphene can be formed by reducing a thin film of graphene oxide, for example. In addition, a semiconductor such as an oxide semiconductor containing impurity elements can also be used. Alternatively, a conductive paste of silver, carbon or copper or a conductive polymer such as polythiophene can be used. Conductive paste is inexpensive, so it is preferred. Conductive polymers are easy to apply, so they are preferred.

[0452] Figure 31 Shows overlapping two Figure 30C An example of a cross-sectional view of a display device including a display panel 370 is shown.

[0453] exist Figure 31In the figure, the display area 101a of the lower display panel (corresponding to Figure 30C The display portion 381 shown) and the visible light blocking region 120a (corresponding to Figure 30C The driving circuit portion 382 shown in FIG. 3), the display area 101b of the upper display panel (corresponding to FIG. 382 and FIG. 382 of FIG. 382) Figure 30C The display portion 381 shown) and the region 110b that transmits visible light (corresponding to Figure 30C The region 110 shown allows visible light to pass through).

[0454] exist Figure 31 In the display device shown, the display panel located on one side (the upper side) of the display surface includes a visible light-transmitting area 110b adjacent to the display area 101b. The display area 101a of the lower display panel overlaps with the visible light-transmitting area 110b of the upper display panel. Therefore, the non-display area between the display areas of the two overlapping display panels can be reduced or even eliminated. This allows for a large display device in which the seams between the display panels are not easily discernible to the user.

[0455] exist Figure 31 In the display device shown, a light-transmitting layer 103 having a refractive index higher than that of air and transmitting visible light is provided between the display region 101a and the visible light-transmitting region 110b. This prevents the intrusion of air between the display region 101a and the visible light-transmitting region 110b, thereby reducing reflections at the interface caused by the difference in refractive index. Furthermore, uneven display and brightness within the display device can be suppressed.

[0456] The light-transmitting layer 103 may overlap the entire surface of the flexible substrate 372 of the lower display panel or the flexible substrate 371 of the upper display panel, or may overlap only the display region 101a and the region 110b that transmits visible light. Furthermore, the light-transmitting layer 103 may overlap the region 120a that blocks visible light.

[0457] For example, an adsorption film including adsorption layers on both surfaces of a substrate can be used as the light-transmitting layer 103 .

[0458] <Manufacturing Method Example of Structural Example 1>

[0459] Reference Figures 32A to 33B An example of a manufacturing method of Structural Example 1 will be described. Figures 32A to 33B It is a cross-sectional view for explaining a method of manufacturing the display portion 381 of the display panel 370 .

[0460] First, if Figure 32A30 , a release layer 403 is formed on a formation substrate 401. Next, a release layer is formed on the release layer 403. Here, the release layer formed on the release layer 403 corresponds to the layers from the insulating layer 378 to the light emitting element 304 in FIG.

[0461] A substrate having heat resistance that can at least withstand the processing temperature in the manufacturing process is used as the formation substrate 401. For example, a glass substrate, a quartz substrate, a sapphire substrate, a semiconductor substrate, a ceramic substrate, a metal substrate, a resin substrate, or a plastic substrate can be used as the formation substrate 401.

[0462] To improve mass productivity, a large glass substrate is preferably used as the formation substrate 401. For example, a glass substrate of the third generation (550 mm × 650 mm) or larger is preferably used, and a glass substrate of the tenth generation (2950 mm × 3400 mm) or larger is preferably used.

[0463] When a glass substrate is used as the forming substrate 401, it is preferred to form an insulating film such as a silicon oxide film, a silicon oxynitride film, a silicon nitride film or a silicon nitride oxide film as a base film between the forming substrate 401 and the peeling layer 403 because contamination from the glass substrate can be prevented.

[0464] The release layer 403 can be formed using an element selected from tungsten, molybdenum, titanium, tantalum, niobium, nickel, cobalt, zirconium, zinc, ruthenium, rhodium, palladium, osmium, iridium, and silicon; an alloy material containing such an element; or a compound material containing such an element. The crystalline structure of the layer containing silicon can be amorphous, microcrystalline, or polycrystalline. Alternatively, metal oxides such as aluminum oxide, gallium oxide, titanium dioxide, indium oxide, ITO, indium zinc oxide, or In-Ga-Zn oxide can be used. Using a high-melting-point metal material such as tungsten, titanium, or molybdenum for the release layer 403 is preferred because it increases the flexibility of the process for forming the release layer.

[0465] The release layer 403 can be formed by, for example, sputtering, plasma CVD, coating (including spin coating, droplet jetting, dispenser method, etc.), printing, etc. The thickness of the release layer 403 is, for example, not less than 1 nm and not more than 200 nm, preferably not less than 10 nm and not more than 100 nm.

[0466] When the lift-off layer 403 has a single-layer structure, it is preferably formed as a tungsten layer, a molybdenum layer, or a layer containing a mixture of tungsten and molybdenum. Alternatively, a layer containing a tungsten oxide or oxynitride, a layer containing a molybdenum oxide or oxynitride, or a layer containing an oxide or oxynitride of a mixture of tungsten and molybdenum may be formed. Furthermore, a mixture of tungsten and molybdenum corresponds to, for example, an alloy of tungsten and molybdenum.

[0467] In addition, when a stacked structure of a layer containing tungsten and a layer containing tungsten oxide is formed as the stripping layer 403, the layer containing tungsten oxide can be formed at the interface between the tungsten layer and the insulating film by forming a layer containing tungsten and forming an insulating film formed of oxide thereon. In addition, the surface of the layer containing tungsten can also be subjected to thermal oxidation treatment, oxygen plasma treatment, nitrous oxide (N2O) plasma treatment, treatment with a highly oxidizing solution such as ozone water, etc. to form a layer containing tungsten oxide. Plasma treatment or heat treatment can be carried out in an atmosphere using oxygen, nitrogen, or nitrous oxide alone or in a mixed gas atmosphere of the above-mentioned gases and other gases. By performing the above-mentioned plasma treatment or heat treatment to change the surface state of the stripping layer 403, the adhesion between the stripping layer 403 and the insulating film formed later can be controlled.

[0468] In addition, when it is possible to peel off at the interface between the forming substrate and the layer to be peeled off, a peeling layer may not be provided. For example, a glass substrate is used as the forming substrate, and an organic resin such as polyimide, polyester, polyolefin, polyamide, polycarbonate, or acrylic resin is formed in contact with the glass substrate. Next, the tightness between the forming substrate and the organic resin is improved by laser irradiation or heat treatment. In addition, an insulating film and transistors are formed on the organic resin. Then, by laser irradiation with a higher energy density than the previous laser irradiation or heat treatment at a higher temperature than the previous heat treatment, peeling off can be performed at the interface between the forming substrate and the organic resin. In addition, when peeling off, separation can also be performed by impregnating the interface between the forming substrate and the organic resin with a liquid.

[0469] Furthermore, the organic resin may be used as a substrate constituting a device, or the organic resin may be removed and the surface exposed by the release layer may be bonded to another substrate using an adhesive.

[0470] Alternatively, a metal layer may be provided between the formation substrate and the organic resin, and a current may be passed through the metal layer to heat the metal layer, thereby causing peeling to occur at the interface between the metal layer and the organic resin.

[0471] The insulating layer 378 is preferably formed using a silicon nitride film, a silicon oxynitride film, a silicon oxide film, a silicon nitride oxide film, or the like in a single layer or a stacked layer.

[0472] Insulating layer 378 can be formed by sputtering, plasma CVD, coating, or printing. For example, by forming insulating layer 378 by plasma CVD at a film formation temperature of 250° C. to 400° C., a dense film with high moisture resistance can be formed. The thickness of insulating layer 378 is preferably from 10 nm to 3000 nm, and more preferably from 200 nm to 1500 nm.

[0473] In addition, if Figure 32B As shown in FIG. 30 , a release layer 413 is formed on a formation substrate 411. Next, a release layer is formed on the release layer 413. Here, the release layer formed on the release layer 413 corresponds to the insulating layer 376, the light shielding layer 326, and the colored layer 325 in FIG.

[0474] As the formation substrate 411 , the separation layer 413 , and the insulating layer 376 , materials that can be used for the formation substrate 401 , the separation layer 403 , and the insulating layer 378 , respectively, can be used.

[0475] Then, if Figure 32C As shown, the formation substrate 401 and the formation substrate 411 are bonded together using an adhesive layer 317 .

[0476] Then, if Figure 33A As shown in FIG. 3 , the formation substrate 401 is separated from the insulating layer 378. Note that either the formation substrate 401 or the formation substrate 411 may be peeled off first.

[0477] It is preferable to form a separation starting point using a laser or a sharp blade before separating the formation substrate 401 from the insulating layer 378. The separation starting point can be formed by forming a crack (film crack or fissure) in a portion of the insulating layer 378. For example, laser irradiation can dissolve, evaporate, or thermally destroy a portion of the insulating layer 378.

[0478] Then, the insulating layer 378 is separated from the formation substrate 401 by physical force (peeling by hand or with a jig, or separating by rotating a roller in close contact with the substrate, etc.) from the formed peeling starting point. Figure 33A The lower portion of FIG shows the peeling layer 403 separated from the insulating layer 378 and the formation substrate 401. Then, as Figure 33A As shown, an adhesive layer 377 is used to adhere the exposed insulating layer 378 and the flexible substrate 371 .

[0479] Then, if Figure 33B As shown, the formation substrate 411 is separated from the insulating layer 376. Figure 33B The upper portion of FIG. 3 shows the separation layer 413 and the formation substrate 411 separated from the insulating layer 376. Then, the exposed insulating layer 376 and the flexible substrate 372 are bonded together using the adhesive layer 375.

[0480] Thus, in one embodiment of the present invention, the functional elements and other components that constitute the display panel are all formed on the substrate used for formation. Therefore, even when manufacturing high-resolution display panels, the high alignment accuracy of the flexible substrate is not required. Therefore, the flexible substrate can be easily bonded. Furthermore, the functional elements and other components can be manufactured at high temperatures, thereby achieving a highly reliable display panel.

[0481] <Structure Example 2>

[0482] Figure 35A A cross-sectional view of a display panel using a color filter method is shown. In the following configuration examples, detailed descriptions of the same components as those in the above configuration examples are omitted.

[0483] Figure 35A The display panel shown includes a flexible substrate 371, an adhesive layer 377, an insulating layer 378, multiple transistors, a conductive layer 307, an insulating layer 312, an insulating layer 313, an insulating layer 314, an insulating layer 315, a light-emitting element 304, a conductive layer 355, an adhesive layer 317, a coloring layer 325, a flexible substrate 372 and an insulating layer 376.

[0484] The driver circuit portion 382 includes a transistor 301 . The display portion 381 includes a transistor 303 .

[0485] Each transistor includes two gates, a gate insulating layer 311, a semiconductor layer, a source electrode, and a drain electrode. Both gates overlap with the semiconductor layer via the insulating layer. Figure 35A An example of a structure in which each transistor has two gates sandwiching a semiconductor layer is shown. Compared to other transistors, this transistor can improve field-effect mobility and increase on-state current. As a result, circuits capable of high-speed operation can be manufactured. Furthermore, the area occupied by the circuit can be reduced. By using transistors with large on-state current, even if the number of wirings increases when the display panel is made larger or higher-definition, the signal delay in each wiring can be reduced, thereby reducing the deviation in display brightness. Figure 35A An example is shown in which one gate electrode is formed using the same material and the same process as the electrode 321 .

[0486] The light emitting element 304 emits light toward the coloring layer 325. The light emitting element 304 overlaps the coloring layer 325 with the insulating layer 314 interposed therebetween. The coloring layer 325 is disposed between the light emitting element 304 and the flexible substrate 371. Figure 35A An example is shown in which the colored layer 325 is arranged on the insulating layer 313 . Figure 35A An example is shown in which neither the light shielding layer nor the spacer is provided.

[0487] <Structure Example 3>

[0488] Figure 35B A cross-sectional view of a display panel using a separate coating method is shown.

[0489] Figure 35BThe display panel shown includes a flexible substrate 371, an adhesive layer 377, an insulating layer 378, multiple transistors, a conductive layer 307, an insulating layer 312, an insulating layer 313, an insulating layer 314, an insulating layer 315, a spacer 316, a light-emitting element 304, an adhesive layer 317, a flexible substrate 372 and an insulating layer 376.

[0490] The driver circuit portion 382 includes a transistor 301 . The display portion 381 includes a transistor 302 , a transistor 303 , and a capacitor 305 .

[0491] Each transistor includes two gates, a gate insulating layer 311, a semiconductor layer, a source electrode, and a drain electrode. Both gates overlap with the semiconductor layer via the insulating layer. Figure 35B An example is shown in which each transistor has a structure in which two gates sandwich a semiconductor layer. Figure 35B An example is shown in which one gate electrode is formed between the insulating layer 313 and the insulating layer 314 .

[0492] The light emitting element 304 emits light toward the flexible substrate 372 side. Figure 35B An example in which the light emitting element 304 does not include an optical adjustment layer is shown. The insulating layer 376 serves as a sealing layer for the light emitting element 304.

[0493] The connection portion 306 includes a conductive layer 307 . The conductive layer 307 is electrically connected to the FPC 373 via a connector 319 .

[0494] <Application Examples>

[0495] In one embodiment of the present invention, a display device (also referred to as an input / output device or a touch panel) incorporating a touch sensor can be manufactured.

[0496] The detection element (also referred to as a sensor element) included in the touch panel of one embodiment of the present invention is not particularly limited, and various sensors capable of detecting the approach or contact of a detection object such as a finger or a stylus pen can be used as the detection element.

[0497] For example, various sensor types such as electrostatic capacitance type, resistive film type, surface acoustic wave type, infrared type, optical type, and pressure-sensitive type can be used.

[0498] In this embodiment, a touch panel including a capacitance-type detection element is described as an example.

[0499] Capacitive sensors include surface capacitive sensors and projected capacitive sensors. Projected capacitive sensors include self-capacitive sensors and mutual capacitive sensors. Mutual capacitive sensors are preferred because they can perform multi-point detection simultaneously.

[0500] The touch panel of one embodiment of the present invention can have various structures, such as a structure in which a display panel and a detection element formed separately are bonded together, or a structure in which electrodes constituting the detection element are provided on one or both of a substrate supporting the display element and a counter substrate.

[0501] <Structure Example 4>

[0502] Figure 36A is a schematic perspective view of the touch panel 300 . Figure 36B It will Figure 36A Schematic diagram of the expansion. Note that for the sake of clarity, only typical components are shown. Figure 36B In FIG. 1 , only the outlines of some components (such as the flexible substrate 330 and the flexible substrate 372 ) are shown by dotted lines.

[0503] The touch panel 300 includes an input device 310 and a display panel 370, which are arranged to overlap each other. The touch panel 300 includes a visible light-transmitting region 110. The visible light-transmitting region 110 is adjacent to the display portion 381 and is arranged along two sides of the display portion 381.

[0504] The input device 310 includes a flexible substrate 330, electrodes 331, 332, a plurality of wirings 341, and a plurality of wirings 342. An FPC 350 is electrically connected to each of the plurality of wirings 341 and the plurality of wirings 342. The FPC 350 is provided with an IC 351.

[0505] Display panel 370 includes flexible substrates 371 and 372 disposed opposite each other. Display panel 370 includes a display portion 381 and a driver circuit portion 382. Wiring 383 and the like are provided on flexible substrate 371. FPC 373 is electrically connected to wiring 383. IC 374 is provided on FPC 373.

[0506] The wiring 383 has a function of supplying signals and power to the display portion 381 and the driver circuit portion 382. The signals and power are input to the wiring 383 from the outside or the IC 374 through the FPC 373.

[0507] Figure 37 An example of a cross-sectional view of touch panel 300 is shown. Figure 37 The cross-sectional structure of the display portion 381, the driver circuit portion 382, ​​the region 110 that transmits visible light, the region including the FPC 373, and the region including the FPC 350 is shown. Figure 37 Also shown is a cross-sectional structure of an intersection 387 where a wiring formed by processing the same conductive layer as the gate of the transistor intersects a wiring formed by processing the same conductive layer as the source and drain of the transistor.

[0508] Flexible substrate 371 and flexible substrate 372 are bonded together by adhesive layer 317. Flexible substrate 372 and flexible substrate 330 are bonded together by adhesive layer 396. Here, each layer from flexible substrate 371 to flexible substrate 372 corresponds to display panel 370. Furthermore, each layer from flexible substrate 330 to electrode 334 corresponds to input device 310. In other words, adhesive layer 396 can be said to bond display panel 370 and input device 310 together. Furthermore, each layer from flexible substrate 371 to insulating layer 376 corresponds to display panel 370. Furthermore, each layer from flexible substrate 330 to flexible substrate 372 corresponds to input device 310. In other words, adhesive layer 375 can be said to bond display panel 370 and input device 310 together.

[0509] Figure 37 The display panel 370 shown has the same structure as the display panel shown in FIG30 , and therefore detailed description thereof will be omitted.

[0510] <Input Device 310>

[0511] The flexible substrate 372 of the flexible substrate 330 is provided with electrodes 331 and 332 on one side. Here, an example is shown in which the electrode 331 includes an electrode 333 and an electrode 334. Figure 37 As shown in the intersection 387 in FIG, the electrode 332 and the electrode 333 are formed on the same plane. In addition, an insulating layer 395 is provided to cover the electrode 332 and the electrode 333. The electrode 334 is electrically connected to the two electrodes 333 provided so as to sandwich the electrode 332 through an opening provided in the insulating layer 395.

[0512] A connection portion 308 is provided in a region near the end of the flexible substrate 330. Wiring 342 and a conductive layer formed by processing the same conductive layer as the electrode 334 are stacked in the connection portion 308. The connection portion 308 is electrically connected to the FPC 350 via a connector 309.

[0513] The flexible substrate 330 is bonded to the insulating layer 393 via the adhesive layer 391. Similar to the manufacturing method of the structural example 1, the input device 310 can also be manufactured by the following steps: manufacturing the element on the forming substrate, peeling the forming substrate, and then transferring the element to the flexible substrate 330. Alternatively, the insulating layer 393 and the element can be directly formed on the flexible substrate 330 (see Figure 38A ).

[0514] <Structure Example 5>

[0515] Figure 38A The touch panel shown is Figure 37 The touch panel shown is different in that: the adhesive layer 391 is not included; and the structures of the transistors 301 , 302 , 303 and the capacitor 305 are different.

[0516] Figure 38A An example of using a top-gate transistor for a touch panel is shown.

[0517] Each transistor includes a gate, a gate insulating layer 311, a semiconductor layer, a source, and a drain. The gate and the semiconductor layer overlap with each other via the gate insulating layer 311. The semiconductor layer may also include a low-resistance region 348. The low-resistance region 348 serves as the source and drain of the transistor.

[0518] A conductive layer provided over the insulating layer 313 serves as a wiring and is electrically connected to the region 348 through openings provided in the insulating layer 313 , the insulating layer 312 , and the gate insulating layer 311 .

[0519] exist Figure 38A In the embodiment, capacitor 305 has a stacked structure comprising a layer formed by processing the same semiconductor layer as the semiconductor layer, a gate insulating layer 311, and a layer formed by processing the same conductive layer as the gate. Preferably, a region 349 having higher conductivity than the channel formation region 347 of the transistor is formed in a portion of the semiconductor layer of capacitor 305.

[0520] The regions 348 and 349 may be regions having a higher impurity content than the channel formation region 347 of the transistor, regions having a high carrier concentration, regions having low crystallinity, or the like.

[0521] The display device according to one embodiment of the present invention can also be used Figures 38B to 38D Transistor 848 is shown.

[0522] Figure 38B A top view of transistor 848 is shown. Figure 38C This is a cross-sectional view of a transistor 848 in a display device according to one embodiment of the present invention, taken along a channel length direction. Figure 38C The cross section of transistor 848 is shown along Figure 38B The cross section of the dotted line X1-X2 in FIG. Figure 38D This is a cross-sectional view of a transistor 848 in a display device according to one embodiment of the present invention, taken along a channel width direction. Figure 38D The cross section of transistor 848 is shown along Figure 38B The cross section of the dotted line Y1-Y2 in FIG.

[0523] The transistor 848 is a top-gate transistor including a back gate.

[0524] In transistor 848, semiconductor layer 742 is provided on the protrusion of insulating layer 772. By providing semiconductor layer 742 on the protrusion of insulating layer 772, the side surface of semiconductor layer 742 can also be covered by gate 743. In other words, transistor 848 has a structure in which the electric field of gate 743 can electrically surround semiconductor layer 742. In this way, a transistor structure in which a semiconductor film is electrically surrounded by the electric field of a conductive film to form a channel is called a surrounded channel (s-channel) structure. In addition, a transistor having an s-channel structure can also be referred to as an "s-channel type transistor" or "s-channel transistor."

[0525] In the s-channel structure, a channel can also be formed in the entire (bulk) semiconductor layer 742. In the s-channel structure, the drain current of the transistor can be increased, thereby obtaining a higher on-state current. In addition, the entire channel formation region formed in the semiconductor layer 742 can be depleted by the electric field of the gate 743. Therefore, the s-channel structure can further reduce the off-state current of the transistor.

[0526] The back gate 723 is provided on the insulating layer 378 .

[0527] The conductive layer 744a provided over the insulating layer 729 is electrically connected to the semiconductor layer 742 through an opening 747c provided in the gate insulating layer 311, the insulating layer 728, and the insulating layer 729. Furthermore, the conductive layer 744b provided over the insulating layer 729 is electrically connected to the semiconductor layer 742 through an opening 747d provided in the gate insulating layer 311, the insulating layer 728, and the insulating layer 729.

[0528] The gate 743 provided on the gate insulating layer 311 is electrically connected to the back gate 723 via the opening 747a and the opening 747b provided in the gate insulating layer 311 and the insulating layer 772. Thus, the gate 743 and the back gate 723 are supplied with the same potential. Alternatively, one of the opening 747a or the opening 747b may not be provided. Alternatively, both the opening 747a and the opening 747b may not be provided. When both the opening 747a and the opening 747b are not provided, different potentials can be supplied to the back gate 723 and the gate 743.

[0529] Examples of semiconductors used for transistors having an s-channel structure include oxide semiconductors, polycrystalline silicon, and silicon such as single crystal silicon transferred from a single crystal silicon substrate.

[0530] <Structure Example 6>

[0531] Figure 39The touch panel shown shows an example in which a bottom emission type display panel and an input device are attached using an adhesive layer 396 .

[0532] Figure 39 Display panel and Figure 35A The display panel is different in that it includes an insulating layer 376. In addition, Figure 39 The input device of FIG. 38 differs from the input device of FIG. 38 in that: the insulating layer 393 is not included; and the electrodes 331 and 332 are directly provided on the flexible substrate 330 .

[0533] <Structure Example 7>

[0534] Figure 40 The touch panel shown shows an example in which a display panel and an input device are bonded together using an adhesive layer 375 by a separate coating method.

[0535] Figure 40 The display panel has Figure 35B Same structure.

[0536] Figure 40 The input device includes an insulating layer 376 on a flexible substrate 392, and electrodes 334 and wiring 342 on the insulating layer 376. Electrodes 334 and wiring 342 are covered by an insulating layer 395. Electrodes 332 and electrodes 333 are provided on the insulating layer 395. Flexible substrate 330 is bonded to flexible substrate 392 via an adhesive layer 396.

[0537] <Structure Example 8>

[0538] Figure 41 The example shown includes a touch sensor and a light emitting element 304 between a pair of flexible substrates (flexible substrate 371 and flexible substrate 372). By using two flexible substrates, the touch panel can be made thinner, lighter, and more flexible.

[0539] By changing the structure of the peeled layer formed on the formation substrate 411 in the manufacturing method example of the structural example 1, it is possible to manufacture Figure 41 In the manufacturing method example of the structural example 1, an insulating layer 376, a coloring layer 325, and a light shielding layer 326 are formed as the peeled layers on the formation substrate 411 (see Figure 32B ).

[0540] In manufacturing Figure 41In the case of the structure shown in FIG. 1 , an insulating layer 376 is formed, and then electrodes 332, 333, and wiring 342 are formed on the insulating layer 376. Next, an insulating layer 395 is formed to cover these electrodes. Next, an insulating layer 327 is formed to cover the electrodes 334. Next, a coloring layer 325 and a light shielding layer 326 are formed on the insulating layer 327. Next, a forming substrate 401 is bonded, and each forming substrate is peeled off and a flexible substrate is bonded. This makes it possible to manufacture a device having a Figure 41 The structure of the touch panel is shown.

[0541] <Structure Example 9>

[0542] Figure 42A and Figure 42B is a schematic perspective view of the touch panel 320 .

[0543] Touch panel 320 includes region 110 that transmits visible light. Region 110 that transmits visible light is adjacent to display portion 381 and is arranged along two sides of display portion 381.

[0544] exist Figure 42A and Figure 42B In FIG. 3 , the input device 318 is provided on the flexible substrate 372 included in the display panel 379 . In addition, the wiring 341 and the wiring 342 of the input device 318 are electrically connected to the FPC 350 provided on the display panel 379 .

[0545] By adopting the above structure, the FPC connected to the touch panel 320 can be provided only on one substrate side (here, the flexible substrate 371 side). Figure 42A and Figure 42B The structure shown is a structure in which two FPCs are mounted on the touch panel 320. The touch panel 320 is not limited to a structure in which multiple FPCs are mounted. By adopting a structure in which a single FPC is provided on the touch panel 320 and signals are supplied from the FPC to the display panel 379 and the input device 318, the structure can be further simplified.

[0546] IC374 has a function of driving the display panel 379. IC351 has a function of driving the input device 318.

[0547] Figure 43 An example of a cross-sectional view of touch panel 320 is shown. Figure 43 The cross-sectional structure of the display portion 381, the driving circuit portion 382, ​​the connection portion 385, the region 110 that transmits visible light, and the region including the FPC 373 is shown. Figure 43Also shown is a cross-sectional structure of an intersection 387 where a wiring formed by processing the same conductive layer as the gate of the transistor intersects a wiring formed by processing the same conductive layer as the source and drain of the transistor.

[0548] In the connection portion 385 , one wiring 342 (or wiring 341 ) and one conductive layer 307 are electrically connected via a connector 386 .

[0549] For example, conductive particles can be used for the connector 386. As the conductive particles, particles such as organic resin or silicon dioxide with a metal material on the surface can be used. As the metal material, nickel or gold is preferably used because it can reduce the contact resistance. In addition, particles such as nickel covered with gold and covered with two or more metal materials in a layered manner are preferably used. In addition, the connector 386 is preferably made of a material that can be elastically deformed or plastically deformed. In this case, the conductive particles sometimes become Figure 43 By having this shape, the contact area between the connector 386 and the conductive layer electrically connected thereto can be increased, thereby reducing contact resistance and suppressing problems such as poor contact.

[0550] The connector 386 is preferably arranged in a manner covered by the adhesive layer 317. For example, after applying a paste or the like to become the adhesive layer 317, the connector 386 can be spread in the connector 385. By arranging the connector 385 in the area where the adhesive layer 317 is provided, it can be applied not only to Figure 43 The light emitting element 304 shown has an adhesive layer 317 disposed thereon (also referred to as a solid sealing structure), and can also be applied to a light emitting panel or liquid crystal display panel having a hollow sealing structure with an adhesive layer 317 disposed therearound.

[0551] Figure 43 An example is shown in which the end portion of the electrode 321 is not covered with the optical adjustment layer 324 . Figure 43 An example is shown in which a spacer 316 is further provided in the driver circuit portion 382 .

[0552] <Structural Example 10>

[0553] Figure 44A The touch panel shown has a light-shielding layer 326 provided between the electrodes and other components that constitute the touch sensor and a flexible substrate 372. Specifically, light-shielding layer 326 is provided between insulating layer 376 and insulating layer 328. Conductive layers such as electrodes 332, electrodes 333, and wiring 342 are provided on insulating layer 328, along with an insulating layer 395 covering these conductive layers and electrodes 334 on insulating layer 395. Furthermore, insulating layer 327 is provided on electrodes 334 and insulating layer 395, and colored layer 325 is provided on insulating layer 327.

[0554] The insulating layer 327 and the insulating layer 328 function as a planarization film. The insulating layer 327 and the insulating layer 328 do not need to be provided if unnecessary.

[0555] With this structure, light shielding layer 326 disposed closer to flexible substrate 372 than electrodes constituting the touch sensor can prevent the electrodes from being recognized by the user.

[0556] In addition, if Figure 44B As shown, the touch panel may include a light shielding layer 326a between the insulating layer 376 and the insulating layer 328, and a light shielding layer 326b between the insulating layer 327 and the adhesive layer 317. By providing the light shielding layer 326b, light leakage can be more reliably suppressed.

[0557] This embodiment mode can be combined with other embodiment modes as appropriate.

[0558] Implementation 3

[0559] In this embodiment, an electronic device and a lighting device according to one embodiment of the present invention are described with reference to the drawings.

[0560] Examples of electronic devices include televisions; monitors for computers, etc.; digital cameras; digital video cameras; digital photo frames; mobile phones (also called mobile phones or mobile phone devices); portable game consoles; portable information terminals; sound reproduction devices; and large-scale game machines such as pinball machines.

[0561] Furthermore, since the electronic device or lighting device of one embodiment of the present invention is flexible, it can be assembled along the curved surfaces of the inner or outer walls of a house or building, or the interior or exterior of a car.

[0562] Furthermore, the electronic device according to one embodiment of the present invention may include a secondary battery, and the secondary battery is preferably charged by contactless power transmission.

[0563] Examples of secondary batteries include lithium ion secondary batteries such as lithium polymer batteries (lithium ion polymer batteries) using a gel electrolyte, nickel hydrogen batteries, nickel cadmium batteries, organic radical batteries, lead storage batteries, air secondary batteries, nickel zinc batteries, and silver zinc batteries.

[0564] An electronic device according to one embodiment of the present invention may also include an antenna. By receiving signals through the antenna, images or data can be displayed on a display unit. In addition, when the electronic device includes an antenna and a secondary battery, the antenna can be used for contactless power transmission.

[0565] In a display device according to one embodiment of the present invention, the display area can be increased indefinitely by increasing the number of display panels. Therefore, the display device according to one embodiment of the present invention is suitable for digital signage, PIDs, and the like. Furthermore, by varying the arrangement of the display panels, the display area of ​​the display device according to one embodiment of the present invention can be formed into a variety of shapes.

[0566] Figure 45A An example is shown in which the display device 10 according to one embodiment of the present invention is applied to a pillar 15 and a wall 16. By using a flexible display panel as the display panel of the display device 10, the display device 10 can be installed along a curved surface.

[0567] In particular, when a display device according to one embodiment of the present invention is used in digital signage or PIDs, incorporating a touch panel into the display panel is preferred because it not only allows for the display of static or dynamic images but also allows intuitive operation by the viewer. Furthermore, when used to provide information such as route information or traffic information, intuitive operation improves usability. Furthermore, when installed on the walls of high-rise buildings or public facilities, for example, a touch panel may not be used in the display panel.

[0568] Figures 45B to 45E An example of an electronic device having a curved display portion 7000 is shown. The display surface of the display portion 7000 is curved, and display can be performed along the curved display surface. The display portion 7000 may also be flexible.

[0569] By using a display device according to one embodiment of the present invention, it is possible to manufacture Figures 45B to 45E Each of the electronic devices shown includes a display portion 7000 .

[0570] Figure 45B The mobile phone 7100 includes a housing 7101, a display portion 7000, operation buttons 7103, an external connection port 7104, a speaker 7105, a microphone 7106, and the like.

[0571] Figure 45B The illustrated mobile phone 7100 includes a touch sensor in a display portion 7000. By touching the display portion 7000 with a finger or a stylus pen, all operations such as making a call and inputting text can be performed.

[0572] Furthermore, by operating the operation button 7103, the power can be turned on and off and the type of image displayed on the display portion 7000 can be switched. For example, the e-mail composition screen can be switched to the main menu screen.

[0573] Figure 45C10 shows an example of a television set. In a television set 7200, a display portion 7000 is incorporated in a housing 7201. Here, a structure in which the housing 7201 is supported by a stand 7203 is shown.

[0574] The operation can be performed by using the operation switch provided by the housing 7201 or the remote control operation machine 7211 provided separately. Figure 45C The television set 7200 shown in FIG. Alternatively, the display portion 7000 may be provided with a touch sensor so that operations can be performed by touching the display portion 7000 with a finger or the like. The remote controller 7211 may also be provided with a display portion for displaying data output from the remote controller 7211. By using the operation keys or touch panel provided on the remote controller 7211, the channel and volume can be controlled, and the image displayed on the display portion 7000 can be operated.

[0575] The television set 7200 is configured to include a receiver or a modem. The receiver can receive general television broadcasts. Furthermore, the modem can be used to connect the television set 7200 to a wired or wireless communication network, enabling one-way (from a sender to a receiver) or two-way (between a sender and a receiver, or between receivers) data communication.

[0576] Figure 45D An example of a portable information terminal is shown. Portable information terminal 7300 includes a housing 7301 and a display portion 7000. It may also include operation buttons, an external connection port, a speaker, a microphone, an antenna, a battery, and the like. Display portion 7000 includes a touch sensor. Portable information terminal 7300 can be operated by touching display portion 7000 with a finger or a stylus.

[0577] Figure 45D is a perspective view of a portable information terminal 7300, Figure 45E It is a top view of the portable information terminal 7300.

[0578] The portable information terminal illustrated in this embodiment has, for example, one or more functions selected from the group consisting of a telephone, an electronic notebook, and an information reader. Specifically, the portable information terminal can be used as a smartphone. The portable information terminal illustrated in this embodiment can execute various applications, such as mobile phone use, email, article reading and writing, music playback, online communication, and computer games.

[0579] The portable information terminal 7300 can display text or images on multiple surfaces. Figure 45D As shown, three operation buttons 7302 may be displayed on one surface, while information 7303 represented by a rectangle may be displayed on another surface. Figure 45D and Figure 45E An example of displaying information on the top surface of a portable information terminal is shown. Alternatively, information may be displayed on the side of the portable information terminal. In addition, information may be displayed on three or more surfaces.

[0580] Examples of information include a display indicating the receipt of an SNS (Social Networking Services) notification, email, or phone call; the subject line of the email or sender's name; the date; the time; the battery level; and the antenna reception strength. Alternatively, an operation button or icon may be displayed in place of the information.

[0581] For example, the user of the portable information terminal 7300 can check the display (here, information 7303 ) while placing the portable information terminal 7300 in a jacket pocket.

[0582] Specifically, the phone number or name of the caller is displayed at a position where the information can be seen from above the portable information terminal 7300. The user can confirm this display without taking the portable information terminal 7300 out of his pocket, thereby being able to decide whether to answer the call.

[0583] Figure 45F An example of a lighting device having a curved light-emitting portion is shown.

[0584] Display device manufacturing using one embodiment of the present invention Figure 45F The lighting device shown has a light-emitting portion.

[0585] Figure 45F The lighting device 7400 shown includes a light emitting portion 7402 having a corrugated light emitting surface. Therefore, a lighting device with high design properties can be provided.

[0586] Furthermore, the various light-emitting units included in the lighting device 7400 may also be flexible. Alternatively, a structure may be adopted in which the light-emitting units are fixed using a plastic member or a movable frame, and the light-emitting surface of the light-emitting units can be bent as desired according to the intended use.

[0587] The lighting device 7400 includes a base 7401 having an operation switch 7403 and a light-emitting unit supported by the base 7401 .

[0588] While this example illustrates a lighting device in which the light-emitting portion is supported by a base, the lighting device can also be used with a housing including the light-emitting portion fixed to or suspended from a ceiling. Since the lighting device can be used with the light-emitting surface curved, the light-emitting surface can be curved concavely to illuminate a specific area or curved convexly to illuminate an entire room.

[0589] Figure 46A1 、 Figure 46A2 、 Figures 46B to 46I An example of a portable information terminal including a flexible display portion 7001 is shown.

[0590] The display portion 7001 can be manufactured using a display device according to one embodiment of the present invention. For example, a display device including a display panel that can be bent with a curvature radius of not less than 0.01 mm and not more than 150 mm can be used. Furthermore, the display portion 7001 can include a touch sensor, allowing the portable information terminal to be operated by touching the display portion 7001 with a finger or the like.

[0591] Figure 46A1 is a perspective view showing an example of a portable information terminal, Figure 46A2 7500 is a side view showing an example of a portable information terminal. The portable information terminal 7500 includes a housing 7501, a display portion 7501, a takeout member 7502, an operation button 7503, and the like.

[0592] The portable information terminal 7500 includes a flexible display portion 7001 rolled up in a housing 7501 .

[0593] The portable information terminal 7500 can receive video signals through a built-in control unit and display the received video on the display unit 7001. Furthermore, a battery is built into the portable information terminal 7500. Alternatively, the housing 7501 may include a terminal portion for connecting a connector, so that video signals or power can be directly supplied from the outside in a wired manner.

[0594] Furthermore, the operation button 7503 can be used to turn the power on and off, switch the displayed image, and the like. Figure 46A1 、 Figure 46A2 and Figure 46B Although an example is shown in which the operation buttons 7503 are arranged on the side surface of the portable information terminal 7500, the present invention is not limited thereto and the operation buttons 7503 may be arranged on the same surface as the display surface (front surface) of the portable information terminal 7500 or on the back surface.

[0595] Figure 46B The portable information terminal 7500 is shown in a state where the display unit 7001 is removed. In this state, an image can be displayed on the display unit 7001. The display unit 7001 can be removed using the removal member 7502. In addition, the portable information terminal 7500 can also be rolled up so that part of the display unit 7001 is rolled up. Figure 46A1 The state shown and the removal of the display unit 7001 Figure 46B The status shown is displayed differently. For example, by Figure 46A1By making the rolled-up portion of the display unit 7001 non-display, the power consumption of the portable information terminal 7500 can be reduced.

[0596] In addition, a frame for reinforcement may be provided on the side of the display portion 7001 so that the display surface of the display portion 7001 can be fixed in a flat shape when the display portion 7001 is removed.

[0597] In addition to the above configuration, a configuration may be adopted in which a speaker is provided in the housing and sound is output using an audio signal received simultaneously with the video signal.

[0598] Figures 46C to 46E An example of a foldable portable information terminal is shown. Figure 46C The portable information terminal 7600 is shown in an unfolded state. Figure 46D The portable information terminal 7600 is shown in a state midway between the expanded state and the folded state. Figure 46E The portable information terminal 7600 is shown in a folded state. The portable information terminal 7600 is highly portable in the folded state, and has a large, seamless display area in the unfolded state, providing a clear view of the display.

[0599] The three housings 7601 connected by a hinge 7602 support the display portion 7001. By folding between two housings 7601 using the hinge 7602, the portable information terminal 7600 can be reversibly changed from an unfolded state to a folded state.

[0600] Figure 46F and Figure 46G An example of a foldable portable information terminal is shown. Figure 46F FIG. 7 shows a state in which the portable information terminal 7650 is folded so that the display portion 7001 is located inside. Figure 46G The portable information terminal 7650 is shown folded with the display portion 7001 facing outward. The portable information terminal 7650 includes a display portion 7001 and a non-display portion 7651. When the portable information terminal 7650 is not in use, folding the display portion 7001 inward can prevent the display portion 7001 from becoming dirty or damaged.

[0601] Figure 46HAn example of a flexible portable information terminal is shown. Portable information terminal 7700 includes a housing 7701 and a display portion 7001. Furthermore, it may include buttons 7703a and 7703b used as input means, speakers 7704a and 7704b used as audio output means, an external connection port 7705, and a microphone 7706. Furthermore, portable information terminal 7700 may be equipped with a flexible battery 7709. Battery 7709 may also overlap with display portion 7001, for example.

[0602] The housing 7701, display portion 7001, and battery 7709 are flexible. Therefore, the portable information terminal 7700 can be easily bent into a desired shape or twisted. For example, the portable information terminal 7700 can be folded and used with the display portion 7001 positioned inside or outside. Alternatively, the portable information terminal 7700 can be used in a rolled-up state. In this way, since the housing 7701 and display portion 7001 can be freely deformed, the portable information terminal 7700 has the advantage of being less susceptible to damage even if it is dropped or subjected to unintended external force.

[0603] In addition, since the portable information terminal 7700 is lightweight, it can be conveniently used in various situations, such as by hanging it by clamping the upper part of the housing 7701 with a clip or the like, or by fixing the housing 7701 to a wall with a magnet or the like.

[0604] Figure 46I An example of a wristwatch-type portable information terminal is shown. Portable information terminal 7800 includes a strap 7801, a display portion 7001, input / output terminals 7802, and operation buttons 7803. The strap 7801 functions as a housing. Furthermore, portable information terminal 7800 may be equipped with a flexible battery 7805. The battery 7805 may overlap with the display portion 7001 or the strap 7801, for example.

[0605] The strap 7801, the display portion 7001, and the battery 7805 are flexible. Therefore, the portable information terminal 7800 can be easily bent into a desired shape.

[0606] In addition to setting the time, operation button 7803 may have various functions such as power on / off, wireless communication on / off, silent mode on / off, and power saving mode on / off. For example, the function of operation button 7803 may be freely set by utilizing the operating system incorporated into portable information terminal 7800.

[0607] Furthermore, an application can be started by touching an icon 7804 displayed on the display portion 7001 with a finger or the like.

[0608] Furthermore, the portable information terminal 7800 can perform standardized short-range wireless communications, such as communicating with a headset capable of wireless communication, thereby enabling hands-free conversations.

[0609] Furthermore, portable information terminal 7800 may also include input / output terminals 7802. When including input / output terminals 7802, portable information terminal 7800 can directly exchange data with other information terminals via a connector. Furthermore, charging can also be performed via input / output terminals 7802. Furthermore, charging can also be performed using contactless power transmission, rather than via input / output terminals 7802.

[0610] The display device of one embodiment of the present invention has the characteristics of being flexible, thin, and lightweight. Figures 47A to 47C The device 81 is shown assembled to the garment.

[0611] There is no particular limitation on the location of the assembly component 81. For example, the assembly component 81 may be located on the front and back of a garment, a collar, a sleeve, or a hood of a garment.

[0612] There is no limitation on the clothes to which the device 81 is assembled, and for example, tops such as shirts and blouses, bottoms such as trousers and skirts, dresses or overalls, etc. The device can also be assembled on scarves, ties, etc.

[0613] Figure 47A 、 Figure 47B and Figure 47C Examples are shown in which the device 81 is assembled to the front body of a shirt, the front body of a polo shirt, and the collar and sleeves of a shirt, respectively.

[0614] The device 81 may be detachably assembled to clothing. For example, when washing clothes, if the device 81 is likely to be damaged, it is preferred to remove the device 81 from the clothing.

[0615] This embodiment mode can be combined with other embodiment modes as appropriate.

[0616] Explanation of symbols

[0617] 10 Display device

[0618] 12 Display device

[0619] 13 Display Area

[0620] 15 Pillars

[0621] 16 Wall

[0622] 31 Light-emitting element

[0623] 36 pixel electrodes

[0624] 38 common electrode

[0625] 40 light-emitting elements

[0626] 41 display area

[0627] 49 display areas

[0628] 51 signal lines

[0629] 52 scan lines

[0630] 55 power cord

[0631] 70a Select transistor

[0632] 70b driver transistor

[0633] 70b1 driver transistor

[0634] 70b2 driver transistor

[0635] 70c driver transistor

[0636] 72a semiconductor layer

[0637] 72b1 semiconductor layer

[0638] 72b2 semiconductor layer

[0639] 74b conductive layer

[0640] 76 conductive layer

[0641] 77 Gate

[0642] 80 pixel circuit

[0643] 81 devices

[0644] 83a Luminous area

[0645] 83b Luminous area

[0646] 85 capacitor

[0647] 100 Display Panel

[0648] 100a display panel

[0649] 100b display panel

[0650] 100c display panel

[0651] 100d display panel

[0652] 101 Display Area

[0653] 101a Display Area

[0654] 101b Display Area

[0655] 101c Display Area

[0656] 101d display area

[0657] 102 Area

[0658] Area 102a

[0659] 102b Area

[0660] 103 Translucent Layer

[0661] 109 display area

[0662] 109a Display area

[0663] 109b Display area

[0664] 110 Area

[0665] 110a area

[0666] 110b area

[0667] 110c area

[0668] 110d area

[0669] 112a FPC

[0670] 112b FPC

[0671] 115b IC

[0672] 120 areas

[0673] 120a area

[0674] 120b area

[0675] 131 resin layer

[0676] 132 protective substrate

[0677] 133 resin layer

[0678] 134 protective substrate

[0679] 141 pixels

[0680] 141a pixels

[0681] 141b pixels

[0682] 141c pixels

[0683] 141d pixels

[0684] 142a Wiring

[0685] 142b cabling

[0686] 145 Wiring

[0687] 149 pixels

[0688] 149a pixels

[0689] 154 bonding layer

[0690] 300 touch panel

[0691] 301 transistor

[0692] 302 transistors

[0693] 303 transistor

[0694] 304 light-emitting element

[0695] 305 capacitor

[0696] 306 connection

[0697] 307 conductive layer

[0698] 308 connection

[0699] 309 Connector

[0700] 310 Input Device

[0701] 311 gate insulation layer

[0702] 312 insulation layer

[0703] 313 insulation layer

[0704] 314 insulation layer

[0705] 315 insulation layer

[0706] 316 Spacer

[0707] 317 adhesive layer

[0708] 318 Input Device

[0709] 319 Connector

[0710] 320 touch panel

[0711] 321 Electrode

[0712] 322 EL layer

[0713] 323 Electrode

[0714] 324 Optical Adjustment Layer

[0715] 325 Coloring Layer

[0716] 326 light shielding layer

[0717] 326a Light-shielding layer

[0718] 326b light shielding layer

[0719] 327 insulation layer

[0720] 328 insulation layer

[0721] 329 protective layer

[0722] 330 Flexible Substrate

[0723] 331 Electrode

[0724] 332 electrodes

[0725] 333 electrode

[0726] 334 electrodes

[0727] 341 Wiring

[0728] 342 Wiring

[0729] 347 Area

[0730] 348 Area

[0731] 349 Area

[0732] 350 FPC

[0733] 351 IC

[0734] 355 conductive layer

[0735] 370 display panel

[0736] 371 Flexible Substrate

[0737] 372 Flexible Substrate

[0738] 373 FPC

[0739] 374 IC

[0740] 375 adhesive layer

[0741] 376 insulation layer

[0742] 377 adhesive layer

[0743] 378 insulation layer

[0744] 379 Display Panel

[0745] 381 Display

[0746] 382 Drive Circuit Department

[0747] 383 Wiring

[0748] 385 connection

[0749] 386 Connector

[0750] 387 intersection

[0751] 391 adhesive layer

[0752] 392 Flexible Substrate

[0753] 393 insulation layer

[0754] 395 insulation layer

[0755] 396 adhesive layer

[0756] 401 Formation substrate

[0757] 403 peeling layer

[0758] 411 Formation substrate

[0759] 413 peeling layer

[0760] 723 Back Gate

[0761] 728 insulation layer

[0762] 729 insulation layer

[0763] 742 semiconductor layer

[0764] 743 Gate

[0765] 744a Conductive layer

[0766] 744b conductive layer

[0767] 747a Opening

[0768] 747b Opening

[0769] 747c Opening

[0770] 747d Opening

[0771] 772 insulation layer

[0772] 848 transistors

[0773] 7000 Display Unit

[0774] 7001 Display

[0775] 7100 Mobile Phone

[0776] 7101 housing

[0777] 7103 Operation Button

[0778] 7104 External connection port

[0779] 7105 Speaker

[0780] 7106 Microphone

[0781] 7200 TV set

[0782] 7201 housing

[0783] 7203 Bracket

[0784] 7211 Remote Control Machine

[0785] 7300 Portable Information Terminal

[0786] 7301 housing

[0787] 7302 Operation Button

[0788] 7303 Information

[0789] 7400 lighting fixtures

[0790] 7401 Base

[0791] 7402 Luminous Unit

[0792] 7403 Operation switch

[0793] 7500 Portable Information Terminal

[0794] 7501 housing

[0795] 7502 Remove components

[0796] 7503 Operation Button

[0797] 7600 Portable Information Terminal

[0798] 7601 housing

[0799] 7602 Hinge

[0800] 7650 Portable Information Terminal

[0801] 7651 Non-display unit

[0802] 7700 Portable Information Terminal

[0803] 7701 housing

[0804] 7703a button

[0805] 7703b button

[0806] 7704a Speaker

[0807] 7704b Speaker

[0808] 7705 External connection port

[0809] 7706 Microphone

[0810] 7709 Battery

[0811] 7800 Portable Information Terminal

[0812] 7801 watch strap

[0813] 7802 Input and output terminals

[0814] 7803 Operation Button

[0815] 7804 Icon

[0816] 7805 battery

[0817] This application is based on Japanese Patent Application No. 2015-176532 filed with the Japan Patent Office on September 8, 2015, the entire contents of which are incorporated herein by reference.

Claims

1. A display device, comprising: a display panel comprising a display area having first pixels and second pixels and a further area surrounding the display area, The first pixel is the outermost pixel in the display area, and the second pixel is adjacent to the first pixel and is not the outermost pixel in the display area. The first pixel and the second pixel each include a display element, The first pixel is electrically connected to a signal line and a scan line, The second pixel is electrically connected to the signal line and the scan line, The other region includes a first region capable of transmitting visible light and a second region capable of shielding visible light, The first area is arranged along one of two opposite sides of the display area, Furthermore, the second area is disposed along the other side of the two opposite sides of the display area.

2. The display device according to claim 1, wherein: The first pixel and the second pixel each include a first transistor electrically connected to the signal line and the scan line.

3. The display device according to claim 1, wherein: The display element comprises a pixel electrode; A size of the pixel electrode in the first pixel is different from a size of the pixel electrode in the second pixel.

4. The display device according to claim 1, wherein: The display element is a light emitting element.

5. A display device, comprising: A display panel comprising a display area having first pixels and second pixels and a further area surrounding the display area, The first pixel is the outermost pixel in the display area, and the second pixel is adjacent to the first pixel and is not the outermost pixel in the display area. The first pixel is configured to simultaneously display the same image as the image displayed in the second pixel, The other region includes a first region capable of transmitting visible light and a second region capable of shielding visible light, The first area is arranged along one of two opposite sides of the display area, Furthermore, the second area is disposed along the other side of the two opposite sides of the display area.

6. The display device according to claim 5, wherein: The first pixel and the second pixel each include a first transistor electrically connected to the same signal line and the same scan line.

7. The display device according to claim 5, wherein: The first pixel and the second pixel each include a pixel electrode; A size of the pixel electrode in the first pixel is different from a size of the pixel electrode in the second pixel.

8. The display device according to claim 5, wherein: The first pixel and the second pixel each include a light emitting element.

9. The display device according to claim 4 or 8, wherein: The light-emitting element includes a light-emitting layer including an organic compound.

Images