Indication device

Abstract

To provide a display device having high luminance and definition.SOLUTION: A display device includes: a first board that includes a first surface and a second surface opposite to the first surface, a first LED chip included in a first pixel, a first FPC, and a first wire connected to the first LED chip and the first FPC being disposed on the second surface; and a second board that includes a third surface and a fourth surface opposite to the third surface, a second LED chip included in a second pixel, a second FPC, and a second wire connected to the second LED chip and the second FPC being disposed on the fourth surface. The second surface opposes the third surface, the second wire is superposed on the first wire, and the second LED chip and the first LED chip are disposed side by side in a plan view.SELECTED DRAWING: Figure 3

Description

[Technical Field] 【0001】 This invention relates to a display device. [Background technology] 【0002】 In recent years, display devices in which each of the multiple pixels contains an element-emitting element have attracted attention. Examples of element-emitting elements include light-emitting diodes (LEDs), micro-LEDs, and organic electroluminescent (EL) elements. Display devices containing element-emitting elements can display images (videos) by controlling the light emission intensity or brightness of the element-emitting elements by the current flowing through them. 【0003】 For example, Patent Documents 1 and 2 disclose a display device using micro-LEDs as pixels (hereinafter referred to as an LED display device). Patent Document 3 also discloses an LED substrate in which two substrates are arranged adjacent to each other along the adjacent direction with their opposing adjacent ends close together, and connectors for power supply harnesses are located at the adjacent ends. [Prior art documents] [Patent Documents] 【0004】 [Patent Document 1] International Publication No. 2021 / 111783 [Patent Document 2] International Publication No. 2020 / 017303 [Patent Document 3] Japanese Patent Publication No. 2013-30433 Specification [Overview of the project] [Problems that the invention aims to solve] 【0005】 LED display devices are required to have both high brightness and high resolution. For example, to increase the brightness of an LED display device, it is necessary to increase the current flowing through the LEDs. Also, to increase the resolution of an LED display device, it is necessary to increase the density of the LEDs beforehand. However, when the current flowing through an LED increases, the LEDs heat up due to an increase in non-luminescent recombination reactions, and the luminous efficiency of the LEDs decreases. When the density of LEDs is increased and the current flowing through each LED increases, the decrease in the luminous efficiency of the LEDs due to the rise in temperature becomes even more pronounced. As a result of the decreased luminous efficiency of the LEDs, a problem arises in that it becomes difficult to increase the brightness of the LED display device by the amount of current that is flowing through it. 【0006】 In view of these challenges, one of the objectives of one embodiment of the present invention is to provide a display device with high brightness and resolution. [Means for solving the problem] 【0007】 One embodiment of the present invention is a display device comprising: a first substrate including a first surface and a second surface opposite to the first surface, the second surface having a first LED chip included in a first pixel, a first FPC and a first wiring connected to the first LED chip and the first FPC; and a second substrate including a third surface and a fourth surface opposite to the third surface, the fourth surface having a second LED chip included in a second pixel, a second FPC and a second wiring connected to the second LED chip and the second FPC, wherein the second surface faces the third surface, the second wiring overlaps the first wiring, and in a plan view, the second LED chip and the first LED chip are arranged side by side. [Brief explanation of the drawing] 【0008】 [Figure 1] This is a schematic plan view showing the configuration of a display device according to the first embodiment of the present invention. [Figure 2] This is a schematic perspective view showing the configuration of a display device according to the first embodiment of the present invention. [Figure 3] A cross-sectional view showing a cross-section of the A1-A2 line of the display device shown in FIG. 2, and a view schematically showing an observer. [Figure 4] A schematic plan view showing the configuration of a first display panel and a control device according to the first embodiment of the present invention. [Figure 5] A schematic plan view showing the configuration of a first display panel and a control device according to the first embodiment of the present invention. [Figure 6] A schematic plan view showing the configuration of a plurality of pixels and wirings included in the first display panel according to the first embodiment of the present invention. [Figure 7] A schematic plan view showing the configuration of a second display panel and a control device according to the first embodiment of the present invention. [Figure 8] A schematic plan view showing the configuration of a second display panel and a control device according to the first embodiment of the present invention. [Figure 9] A schematic plan view showing the configuration of a plurality of pixels and wirings included in the second display panel according to the first embodiment of the present invention. [Figure 10] A schematic plan view showing the configuration of a plurality of pixels and wirings included in the display device according to the first embodiment of the present invention. [Figure 11] A view enlarging a part of a plurality of pixels and wirings shown in FIG. 10. [Figure 12] A cross-sectional view showing a cross-section of the B1-B2 line shown in FIG. 11. [Figure 13] A view showing a control device in a functional block in the display device according to the first embodiment of the present invention. [Figure 14] A flowchart for explaining a display method of the display device according to the first embodiment of the present invention. [Figure 15] A timing chart for explaining a display method of the display device according to the first embodiment of the present invention. [Figure 16] A view showing a modification example of a low-reflection heat dissipation layer included in the second display panel according to the first embodiment of the present invention. [Figure 17]This figure shows a modified example of the low-reflection heat dissipation layer included in the second display panel according to the first embodiment of the present invention. [Figure 18] This figure shows a modified example of the low-reflection heat dissipation layer included in the second display panel according to the first embodiment of the present invention. [Figure 19] (A), (B), and (C) are diagrams showing the arrangement of pixels according to the first embodiment of the present invention. [Figure 20] This diagram shows a control device in a display device according to a second embodiment of the present invention, with the control device represented by a functional block. [Figure 21] This is a flowchart illustrating the display method of the display device according to the second embodiment of the present invention. [Figure 22] This is a schematic perspective view showing the configuration of a display device according to the third embodiment of the present invention. [Figure 23] This is a schematic perspective view showing the configuration of a display device according to the fourth embodiment of the present invention. [Figure 24] This is a schematic perspective view showing the configuration of a display device according to the fifth embodiment of the present invention. [Modes for carrying out the invention] 【0009】 The embodiments of the present invention will be described below with reference to the drawings and other drawings. However, the present invention can be implemented in many different ways and is not limited to the embodiments described below. 【0010】 While drawings may schematically represent the configuration of each part compared to the actual embodiment in order to clarify the explanation, they are merely examples and do not limit the interpretation of the present invention. 【0011】 In the specification and figures of this application, elements similar to those described above in previously shown figures are denoted by the same reference numerals (or numerals followed by letters such as a, b, A, B, etc.), and detailed explanations may be omitted as appropriate. The letters "1st" and "2nd" appended to each element are merely convenient indicators used to distinguish each element and have no further meaning unless otherwise specified. 【0012】 In the specification of this application, when a member or region is "above (or below)" another member or region, unless otherwise specified, this includes cases where it is directly above (or directly below) the other member or region, and where it is above (or below) the other member or region. That is, it also includes cases where another component is included between a member or region and the area above (or below) the other member or region. 【0013】 In the specification of this application, expressions such as "α includes A, B, or C," "α includes any one of A, B, and C," and "α includes one selected from the group consisting of A, B, and C" do not exclude cases where α includes multiple combinations of A, B, and C, unless otherwise explicitly stated. Furthermore, these expressions do not exclude cases where α includes other elements. 【0014】 In the specification of this application, the X direction intersects the Y direction, and the Z direction intersects the X and Y directions (XY plane). The X direction is called the first direction, the Y direction is called the second direction, and the Z direction is called the third direction. 【0015】 In the specification of this application, when the terms "identical" and "identical" are used, these terms may include cases where errors within the scope of the design are present. 【0016】 In the specification of this application, the first display panel is provided with insulating layers, semiconductor layers, and conductive layers, or elements such as transistors and light-emitting elements, on the second surface, and the second display panel is provided with insulating layers, semiconductor layers, and conductive layers, or elements such as transistors and light-emitting elements, on the fourth surface. In the following description, unless otherwise specified, in a cross-sectional view of the first display panel, the side on which the light-emitting elements are arranged relative to the second surface will be referred to as "top" or "upper surface," and the opposite side will be referred to as "bottom" or "lower surface." In a cross-sectional view of the second display panel, the side on which the light-emitting elements are arranged relative to the fourth surface will be referred to as "top" or "upper surface," and the opposite side will be referred to as "bottom" or "lower surface." The second display panel is positioned "top" the first display panel. 【0017】 In the specification and claims of this application, one embodiment of a display device is, as an example, a display device that uses an LED as a light-emitting element. 【0018】 <First Embodiment> <1. Overall configuration of the display device 10> Figure 1 is a schematic plan view showing the configuration of a display device 10 according to the first embodiment of the present invention, and Figure 2 is a schematic perspective view showing the configuration of the display device 10. Figure 3 is a cross-sectional view showing the cross-section of the display device 10 shown in Figure 2 along the line A1-A2, and a schematic diagram showing an observer. 【0019】 As shown in Figure 1, Figure 2, or Figure 3, the display device 10 includes a first display panel 100, a first driver IC 106, a second display panel 200, a second driver IC 206, a control device 300, and a housing 400. 【0020】 The second display panel 200 is placed on top of the first display panel 100. That is, the first display panel 100 and the second display panel 200 are positioned in the Z direction. In the Z direction, the distance between the first display panel 100 and the second display panel 200 is distance H1. Also, the distance between the observer 30 and the display device 10 is distance H2. 【0021】 The length of the side of the first display panel 100 in the X direction is S1, and the length of the side in the Y direction is L1. The length of the side of the second display panel 200 in the X direction is S2, and the length of the side in the Y direction is L2. Length S1 is the same as length S2, and length L1 is shorter than length L2. That is, the outer dimensions of the second display panel 200 are larger than the outer dimensions of the first display panel 100. However, the outer dimensions of the second display panel 200 may be the same as the outer dimensions of the first display panel 100. 【0022】 The first display panel 100 includes a display unit 104 containing multiple pixels PIX1 (see Figure 4) and is electrically connected to a first driver IC 106. The first display panel 100 also includes a substrate 110 with a first surface 112 and a second surface 114 opposite to the first surface 112, a low-reflection heat dissipation layer 120 disposed on the first surface 112, an array layer 130 disposed on the second surface 114, and an insulating layer 140 and an FPC 150 disposed on the array layer 130. In other words, in the first display panel 100, the low-reflection heat dissipation layer 120, the substrate 110, the array layer 130, and the insulating layer 140 are stacked in this order in the Z direction. The FPC 150 is disposed at the end of the first display panel 100 on the second surface 114 side. The low-reflection heat dissipation layer 120 is sometimes called the first heat dissipation layer, and the insulating layer 140 is sometimes called the second heat dissipation layer. 【0023】 The second display panel 200 includes a display unit 204 containing multiple pixels PIX2 (see Figure 7) and is electrically connected to the second driver IC 206. The second display panel 200 also includes a substrate 210 with a first surface 212 and a second surface 214 opposite to the first surface 212, a low-reflection heat dissipation layer 220 disposed on the first surface 212, an array layer 230 disposed on the second surface 214, and an insulating layer 240 and an FPC 250 disposed on the array layer 230. In other words, in the second display panel 200, the low-reflection heat dissipation layer 220, the substrate 210, the array layer 230, and the insulating layer 240 are stacked in this order in the Z direction. The FPC 250 is disposed at the end of the second display panel 200 on the second surface 214 side. The first surface 212 may be called the third surface, the second surface 214 may be called the fourth surface, the low-reflection heat dissipation layer 220 may be called the third heat dissipation layer, and the insulating layer 240 may be called the fourth heat dissipation layer. 【0024】 The control device 300 includes a display panel control circuit 310 and a display selection circuit 330. As will be described in detail later, pixels PIX1 and PIX2 include light-emitting elements. The control device 300 supplies signals and power supply voltage to the first driver IC 106, the second driver IC 206, the scan signal line drive circuit 108, and the scan signal line drive circuit 208, and controls the display of images on the first display panel 100 and the second display panel 200. 【0025】 The housing 400 includes a side wall 410. The low-reflection heat dissipation layer 120 and the low-reflection heat dissipation layer 220 are connected to the side wall 410. Although not shown in the illustration, the low-reflection heat dissipation layer 120 and the low-reflection heat dissipation layer 220 are connected to the side wall 410 using, for example, metal clips, wiring and solder. To simplify the explanation of the display device 10, although not shown in the illustration, the housing 400 includes side walls provided on the three sides other than the side wall 410, and is configured to surround all four sides of the low-reflection heat dissipation layer 120 and the low-reflection heat dissipation layer 220. The side walls provided on the three sides other than the side wall 410 have the same configuration and function as the side wall 410 and are connected to the low-reflection heat dissipation layer 120 and the low-reflection heat dissipation layer 220. 【0026】 In the display device 10, the heat generated during the display of the first display panel 100 and the second display panel 200 can be dissipated to the housing 400 via the low-reflection heat dissipation layer 120 and the low-reflection heat dissipation layer 220. In other words, the display device 10 has a configuration that allows heat to be dissipated (a heat-dissipating configuration). Furthermore, by having a heat-dissipating configuration, the display device 10 can suppress the decrease in the luminous efficiency of each light-emitting element caused by the heat generated during the display of the first display panel 100 and the second display panel 200. Moreover, by having a heat-dissipating configuration, the display device 10 can allow more current to flow through each light-emitting element than before, making it possible to set the brightness of the light-emitting elements to a higher level. 【0027】 Furthermore, in the display device 10, the FPC 250 is positioned on the opposite side of the Y-direction from the FPC 150. The FPC 250 does not overlap the FPC 150. Compared to the case where the FPC 250 and FPC 150 overlap each other, by not overlapping the FPC 250 and FPC 150, the heat generated in conjunction with the display of the first display panel 100 and the second display panel 200 can be suppressed from concentrating near the FPC. 【0028】 The low-reflection heat dissipation layer 220 is superimposed on the FPC 150 and FPC 250. Furthermore, the length of the low-reflection heat dissipation layer 220 in the X direction is longer than the length of the low-reflection heat dissipation layer 120 in the X direction and the length of the insulating layer 140 in the X direction. In other words, as described above, in the display device 10, the outer dimensions of the second display panel 200 are larger than the outer dimensions of the first display panel 100. As a result, the second display panel 200 is superimposed on the FPC 150, and the FPC 150 can be hidden. 【0029】 <2. Configuration of the first display panel 100 and control device 300> Figures 4 and 5 are schematic plan views showing the configuration of the first display panel 100 and the control device 300. Figure 6 is a schematic plan view showing the configuration of multiple pixels PIX1 and wiring (video signal lines 186a to 186f) included in the first display panel 100. Configurations that are the same as or similar to those in Figures 1 to 3 are omitted from this explanation. 【0030】 First, the block configuration of the first display panel 100 and the control device 300 will be described using Figure 4. As shown in Figure 4, the first display panel 100 is broadly divided into a display section 104 and a peripheral section 116. The first display panel 100 includes a substrate 110, a first driver IC 106, a scanning signal line drive circuit 108, an FPC (Flexible Printed Circuit) 150, a plurality of pixels PIX1, wiring 124, and wiring 126. 【0031】 As described above, the display unit 104 includes a plurality of pixels PIX1. The peripheral unit 116 includes a first driver IC 106, a scanning signal line drive circuit 108, a terminal unit 111, an FPC 150, and a plurality of wirings 124. The display unit 104 and the peripheral unit 116 include a plurality of wirings 126. The terminal unit 111 includes a plurality of terminals 115 and a plurality of terminals 118. The scanning signal line drive circuit 108, the plurality of terminals 115 and a plurality of terminals 118, and the plurality of pixels PIX1 are arranged on the second surface 114 (see Figure 2) of the substrate 110. The first driver IC 106 is arranged on the upper surface of the FPC 150. 【0032】 Multiple pixels PIX1 are arranged in a matrix in the X and Y directions. Each of the multiple pixels PIX1 contains multiple subpixels 160R, 160G, and 160B. For example, subpixel 160R has a red-emitting light-emitting element RLED1, subpixel 160G has a green-emitting light-emitting element GLED1, and subpixel 160B has a blue-emitting light-emitting element BLED1. In the display device 10, each of the light-emitting elements RLED1, GLED1, and BLED1 is sometimes referred to as an LED chip. 【0033】 Multiple wires 124 are arranged between the display unit 104 and multiple terminals 115. Multiple wires 126 are arranged between the scanning signal line drive circuit 108 and multiple terminals 118. In addition, in the display device 10, wires 132 may be arranged to surround the display unit 104 and the scanning signal line drive circuit 108. 【0034】 The first driver IC 106 may be located on the second surface 114 (see Figures 2 and 3), and part or all of the drive circuit included in the first driver IC 106 may be directly formed on the second surface 114. Alternatively, part or all of the drive circuit included in the scan signal line drive circuit 108 may be formed on a circuit board different from the substrate 110, and this circuit board may be located on the upper surface of the FPC 150. 【0035】 Multiple wires 124 are electrically connected to multiple sub-pixels 160R, 160G, and 160B. Multiple wires 124 are also electrically connected one-to-one to multiple terminals 115. Multiple wires 126 are electrically connected to the scan signal line drive circuit 108. Multiple wires 126 are also electrically connected one-to-one to multiple terminals 118. The first driver IC 106 is electrically connected to multiple terminals 115. The terminal section 111 (multiple terminals 115 and multiple terminals 118) is electrically connected to the FPC 150 and also to the control device 300. Wiring 132 is electrically connected, for example, to multiple terminals 118. 【0036】 The scanning signal line drive circuit 108 and the first driver IC 106 are electrically connected to the control device 300. The scanning signal line drive circuit 108 and the first driver IC 106 use signals and power supply voltage supplied from the control device 300 to drive the transistors (see Figure 5) of each pixel PIX1, for example, to make the light-emitting element RLED1 emit light or not. As a result, the first display panel 100 can display an image (video) on the display unit 104. 【0037】 Next, the electrical connections of the first display panel 100 and the control device 300 will be explained in detail using Figure 5. As shown in Figure 5, the first driver IC 106 is electrically connected to the video signal lines 186a to 186c. The video signal lines 186a to 186c are, for example, wiring 124 (see Figure 4). Video signals SL1(1) to SL1(3) are supplied to the video signal lines 186a to 186c, respectively. For example, the first driver IC 106 supplies the video signal SL1(m) in common to multiple pixels PIX1 located in the mth column of the display unit 104. The voltage supplied to the video signal SL1(m) is called voltage Vsig1(m) or voltage Vsig1(n). Voltage Vsig1(m) and voltage Vsig1(n) are determined based on the image (video) displayed on the display unit 104. The numerical value m is any integer greater than or equal to 3, and the numerical value n is any integer greater than or equal to 1. 【0038】 The scanning signal line drive circuit 108 is electrically connected to the scanning signal lines 184a to 184c. Scanning signals SG1(1) to SG1(n) are supplied to the scanning signal lines 184a to 184c, respectively. For example, the scanning signal line drive circuit 108 supplies the scanning signal SG1(n) in common to multiple pixels PIX1 located in the nth row of the display unit 104. 【0039】 The control device 300 and the multiple pixels PIX1 are electrically connected to the reset signal line VL1, the reference potential line PVSS, and the drive power line PVDD. The drive power line PVDD, the reference potential line PVSS, and the drive power line PVDD are, for example, wiring 132 (see Figure 4). The reset signal VL1 supplies voltage VR. The reference potential line PVSS supplies the reference potential VSS. The drive power line PVDD supplies the drive voltage VDDH. The control device 300 supplies voltage VR, reference potential VSS, and drive voltage VDDH in common to the multiple pixels PIX1 in the display unit 104. 【0040】 In the display device 10, for example, the voltage VR is smaller than the reference potential VSS and the drive voltage VDDH. Also, in the display device 10, for example, the voltage VR is a fixed voltage, but the voltage VR may change over time. The voltage VR is sometimes called the reset voltage or initialization voltage. 【0041】 <3. Pixel Circuit Configuration> Next, the configuration of the pixel circuit will be explained using Figure 5. Sub-pixels 160R, 160G, and 160B each contain a pixel circuit. In sub-pixels 160R, 160G, and 160B, the configuration is the same except for the light-emitting element and the video signal SL1(n). In the following explanation, the configuration of the pixel circuit of sub-pixel 160R will be mainly explained, and the configurations of the pixel circuits of sub-pixels 160G and 160B will be omitted. 【0042】 The sub-pixel 160R includes at least a drive transistor DRT, a selection transistor SST, a capacitive element SC, and a light-emitting element RLED1. The drive transistor DRT and the selection transistor SST each have a first electrode (gate electrode) and a pair of electrodes (source electrode, drain electrode) consisting of a second electrode and a third electrode. The capacitive element SC has a pair of electrodes. 【0043】 The gate electrode of the selection transistor SST is electrically connected to the scan signal line 184a. The source electrode of the selection transistor SST is electrically connected to the video signal line 186a. The drain electrode of the selection transistor SST is electrically connected to the gate electrode of the drive transistor DRT and to the first electrode of the capacitive element SC. The drain electrode of the drive transistor DRT is electrically connected to the drive power line PVDD. The source electrode of the drive transistor DRT is electrically connected to the first electrode of the light-emitting element RLED1. The second electrode of the capacitive element SC is electrically connected to the reset signal line VL1. The second electrode of the light-emitting element RLED1 is electrically connected to the reference voltage line PVSS. The reference voltage line PVSS is electrically connected, for example, to the cathode electrode. 【0044】 The selection transistor SST has the function of supplying the video signal SL1(m) to the drive transistor DRT. The drive transistor DRT has the function of using the input video signal SL1(m) to supply current to the light-emitting element RLED1, causing the light-emitting element RLED1 to emit light. The capacitive element SC has the function of holding a charge (first charge) corresponding to the threshold voltage of the drive transistor DRT. The capacitive element SC also has the function of holding a charge (second charge) corresponding to the video signal SL1(m) (voltage Vsig1(m)) input to the gate electrode of the drive transistor DRT in order for the subpixel 160R to emit light. The light-emitting element RLED1 has diode characteristics. 【0045】 <4. An example of driving a pixel circuit> Next, an example of pixel circuit driving will be described. The scan signal line driving circuit 108 controls multiple scan signal lines. For example, the scan signal line driving circuit 108 selects scan signal line 184a and supplies scan signal SG1(1) to scan signal line 184a. The first driver IC 106 controls multiple video signal lines. For example, the first driver IC 106 supplies video signal SL1(1) to video signal line 186a. The control device 300 supplies drive voltage VDDH to drive power line PVDD, reference voltage VSS to reference potential line PVSS, and voltage VR to reset signal VL1. 【0046】 When the signal supplied to the scan signal SG1(1) is at a low level, the selection transistor SST is in a non-conducting state. When the signal supplied to the scan signal SG1(1) is at a high level, the selection transistor SST is in a conducting state. 【0047】 When a high-level signal is supplied to the scanning signal SG1(1) and the selection transistor SST becomes conductive, charge (second charge) is accumulated (held) in the capacitive element SC based on the voltage Vsig1(1) of the video signal SL1(1). The voltage between the gate electrode and the drain electrode of the drive transistor DRT (GD voltage) is determined according to the amount of charge (second charge) accumulated (held) in the capacitive element CS. 【0048】 Once the GD voltage is determined, a current corresponding to the GD voltage flows from the drive power line PVDD to the reference potential line PVSS. That is, a current corresponding to the GD voltage flows through the drive transistor DRT. A current corresponding to the GD voltage of the drive transistor DRT also flows through the light-emitting element RLED1. As a result, the light-emitting element RLED1 emits light with a brightness corresponding to this current. 【0049】 When a low-level signal is supplied to the scanning signal SG1(1), the selection transistor SST becomes non-conductive. Even though the selection transistor SST is non-conductive, the capacitive element CS retains charge (second charge), so a current corresponding to the G / D voltage of the drive transistor DRT flows from the drive power line PVDD to the reference potential line PVSS. In other words, a current corresponding to the G / D voltage of the drive transistor DRT is supplied to the light-emitting element RLED1. 【0050】 In the first display panel 100, a conductive state indicates that the source electrode and drain electrode of the transistor are conducting, and the transistor is ON. A non-conductive state indicates that the source electrode and drain electrode of the transistor are not conducting, and the transistor is OFF. In each transistor, the source electrode and drain electrode may be swapped depending on the voltage or potential supplied to each electrode. Furthermore, it is easily understood by those skilled in the art that even when a transistor is OFF, a small current may flow, such as leakage current. 【0051】 Furthermore, each transistor shown in Figure 5 may have a channel region containing a Group 14 element such as silicon or germanium, or an oxide exhibiting semiconductor properties. For example, the channel region of each transistor may contain low-temperature polysilicon (LTPS). In the first display panel 100, each transistor is formed using thin-film transistors (TFTs) and has an n-channel field-effect transistor. Each transistor may have both an n-channel field-effect transistor and a p-channel field-effect transistor, or it may have only a p-channel field-effect transistor. The first display panel 100 may be appropriately configured with the transistor configuration, capacitance connection, power supply voltage, etc., depending on the application and specifications. 【0052】 <5. Example configuration of Pixel PIX1> Next, an example of the configuration of pixel PIX1 in a plan view will be described. Figure 6 is a schematic plan view showing the configuration of multiple pixels PIX1 and wiring included in the first display panel 100. In Figure 6, four pixels PIX1 arranged in 2 rows and 2 columns are shown in an enlarged view among the multiple pixels PIX1 arranged in the display unit 104. Specifically, as shown in Figure 6, pixels PIX1(1,1) and pixel PIX1(2,1) are arranged in the X direction. Pixel PIX1(1,2) and pixel PIX1(2,2) are arranged in the X direction. Also, pixels PIX1(1,1) and pixel PIX1(1,2) are arranged in the Y direction. Pixel PIX1(2,1) and pixel PIX1(2,2) are arranged in the Y direction. When it is not necessary to explain each pixel separately, they are simply referred to as pixel PIX1. 【0053】 Each of the multiple pixels PIX1 includes a light-emitting element RLED1 (sub-pixel 160R), a light-emitting element GLED1 (sub-pixel 160G), and a light-emitting element BLED1 (sub-pixel 160B). Pixels PIX1(1,1) and PIX1(2,1) are electrically connected to the scan signal line 184a, and the scan signal SG1(1) is supplied to pixels PIX1(1,1) and PIX1(2,1). Pixels PIX1(1,2) and PIX1(2,2) are electrically connected to the scan signal line 184b, and the scan signal SG1(2) is supplied to pixels PIX1(1,2) and PIX1(2,2). Pixels PIX1(1,1) and PIX1(1,2) are electrically connected to video signal lines 186a, 186b, and 186c, and video signals SL1(1), SL1(2), and SL1(3) are supplied to pixels PIX1(1,1) and PIX1(1,2). Pixels PIX1(2,1) and PIX1(2,2) are electrically connected to video signal lines 186d, 186e, and 186f, and video signals SL1(4), SL1(5), and SL1(6) are supplied to pixels PIX1(2,1) and PIX1(2,2). 【0054】 In the first display panel 100, multiple light-emitting elements and multiple video signal lines 186a to 186f (signal line group SL1G) are grouped together and arranged in close proximity in two adjacent pixels PIX1 in the X direction. One adjacent pixel PIX1 and the other adjacent pixel PIX1 are arranged in a positional relationship that is inverted with respect to an imaginary line parallel to the Y direction as the axis of symmetry. Alternatively, pixels PIX1(1,1), PIX1(2,1), PIX1(1,2), and PIX1(2,2) are arranged so as to be point-symmetric with respect to point Q. Specifically, when pixels PIX1(1,1), PIX1(2,1), PIX1(1,2), and PIX1(2,2) are rotated 180 degrees around point Q, pixel PIX1(1,1) will overlap with pixel PIX1(2,2), and pixel PIX1(2,1) will overlap with pixel PIX1(1,2). 【0055】 Two adjacent pixels PIX1 in the X direction (for example, pixels PIX1(2,2) and PIX1(3,2) (not shown)) are in a region enclosed by two adjacent signal line groups SL1G in the X direction and two adjacent scan signal lines 184b and scan signal line 184c (not shown) in the Y direction. Here, the arrangement pitch PPX+PPX of pixels PIX1(2,2) and pixels PIX1(3,2) in the X direction is the same as the arrangement pitch PPX+PPX of pixels PIX1(2,1) and pixels PIX1(2,2) in the X direction, and is the same as the arrangement pitch PPX+PPX of adjacent signal line groups SL1G in the X direction. Note that in the display device 10, the arrangement pitch is sometimes called the pixel pitch. 【0056】 The arrangement pitch PPY of pixel PIX1 in the Y direction is the same as the arrangement pitch of adjacent scan signal lines 184b and 184c in the Y direction, and the arrangement pitch of adjacent scan signal lines 184a and 184b in the Y direction. 【0057】 Next, we will focus on the adjacent pixels PIX1(1,1) and PIX1(2,1) in the X direction and explain the configuration of each pixel PIX1. In the following explanation, one direction in the X direction (right direction in Figure 6) may be referred to as the +X direction, and the other direction in the X direction (left direction in Figure 6) may be referred to as the -X direction. Similarly, one direction in the Y direction (up direction in Figure 6) may be referred to as the +Y direction, and the other direction in the Y direction (down direction in Figure 5) may be referred to as the -Y direction. 【0058】 The signal line group SL1G includes multiple adjacent video signal lines 186a to 186f in the X direction. Specifically, the signal line group SL1G is formed by three video signal lines 186a to 186c connected to the pixel PIX1(1,1) (first pixel) on the left side of Figure 5, which are adjacent and clustered together in the X direction, and three video signal lines 186d to 186f connected to the pixel PIX1(2,1) (second pixel) on the right side of Figure 5. In the X direction, the signal line group SL1G is arranged in the following order: video signal line 186c (video signal SL1(3)), video signal line 186b (video signal SL1(2)), video signal line 186a (video signal SL1(1)), video signal line 186f (video signal SL1(6)), video signal line 186e (video signal SL1(5)), and video signal line 186d (video signal SL1(4)). Note that the arrangement of video signal lines is not limited to the arrangement shown in Figure 6, and may be changed as appropriate according to the specifications and application. 【0059】 In each of the multiple pixels PIX1, the light-emitting elements RLED1, GLED1, and BLED1 are arranged adjacent to each other in the X direction and are provided near the intersection of the video signal line group SL1G and the scan signal line 184a. Specifically, in the X direction, the signal line group SL1G is provided between the light-emitting elements RLED1, GLED1, and BLED1 included in pixel PIX1(1,1) and the light-emitting elements RLED1, GLED1, and BLED1 included in pixel PIX1(2,1). Also, in the Y direction, the scan signal line 184a that intersects with the video signal line group SL1G is provided between the light-emitting elements RLED1, GLED1, and BLED1 included in pixel PIX1(1,1) and the light-emitting elements RLED1, GLED1, and BLED1 included in pixel PIX1(2,1). 【0060】 The light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1(1,1) are arranged in this order in the X direction. The light-emitting elements RLED1, GLED1, and BLED1 are positioned adjacent to the video signal line group SL1G in the X direction (-X direction). In addition, the light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1(1,1) are positioned adjacent to each other in the X direction in the -Y direction of the scan signal line 184a that intersects with the video signal line group SL1G. 【0061】 The light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1(2,1) are arranged in this order in the X direction, and the light-emitting elements RLED1, GLED1, and BLED1 are positioned adjacent to the video signal line group SL1G in the X direction (+X direction). In addition, the light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1(2,1) are positioned adjacent to each other in the X direction in the +Y direction of the scan signal line 184a that intersects with the video signal line group SL1G. 【0062】 The light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1(1,1) and the light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1(2,1) are arranged similarly in the X direction. Note that the arrangement of the light-emitting elements RLED1, GLED1, and BLED1 shown in Figure 6 (order of arrangement in the X direction) is just one example, and the arrangement of the light-emitting elements RLED1, GLED1, and BLED1 is not limited to the arrangement shown in Figure 6. The arrangement of the light-emitting elements RLED1, GLED1, and BLED1 may differ for each pixel PIX1. 【0063】 The sub-pixels 160R, 160G, and 160B included in pixel PIX1 are electrically connected to the corresponding video signal lines 186a to 186f, respectively, via the semiconductor layer 171 forming the selection transistor SST and the contact hole 172. Furthermore, each light-emitting element included in pixel PIX1 is electrically connected to the drive power line PVDD via the contact hole 134 and to the reference potential line PVSS via the contact hole 138. The drive power line PVDD and the reference potential line PVSS are provided overlapping the scan signal line 184a and extend in the X direction. Note that in Figure 6, the drive power line PVDD and the reference potential line PVSS are represented by dashed lines for clarity. 【0064】 The light-emitting elements RLED1, GLED1, and BLED1 contained in pixel PIX1 are each electrically connected to the fifth conductive layer 194 (for example, the junction electrode 194a (see Figure 12)). The fifth conductive layer 194 is electrically connected to the fourth conductive layer 192 via the contact hole 136. As will be described in detail later, the fourth conductive layer 192 is electrically connected to the drain electrode of the drive transistor DRT via multiple conductive layers and contact holes. 【0065】 <6. Configuration of the second display panel 200 and control device 300> Figures 7 and 8 are schematic plan views showing the configuration of the second display panel 200 and the control device 300. Figure 9 is a schematic plan view showing the configuration of multiple pixels PIX2 and wiring (video signal lines 286a to 286f) included in the second display panel 200. Configurations that are the same as or similar to those in Figures 1 to 6 are omitted from this explanation. 【0066】 First, the block configuration of the second display panel 200 and the control device 300 will be described using Figure 7. As shown in Figure 7, the second display panel 200 is broadly divided into a display unit 204 and a peripheral unit 216. The second display panel 200 includes a substrate 210, a second driver IC 206, a scanning signal line drive circuit 208, an FPC (Flexible Printed Circuit) 250, multiple pixels PIX2, wiring 224, and wiring 226. 【0067】 As described above, the display unit 204 includes a plurality of pixels PIX2. The peripheral unit 216 includes a second driver IC 206, a scanning signal line drive circuit 208, a terminal unit 209, an FPC 250, and a plurality of wirings 224. The display unit 204 and the peripheral unit 216 include a plurality of wirings 226. The terminal unit 209 includes a plurality of terminals 215 and a plurality of terminals 218. The scanning signal line drive circuit 208, the plurality of terminals 215 and a plurality of terminals 218, and the plurality of pixels PIX2 are arranged on the second surface 214 of the substrate 210 (see Figure 2). The second driver IC 206 is arranged on the upper surface of the FPC 250. 【0068】 Multiple pixels PIX2 are arranged in a matrix in the X and Y directions. Each of the multiple pixels PIX2 contains multiple subpixels 260R, 260G, and 260B. For example, subpixel 260R has a red-emitting light-emitting element RLED2, subpixel 260G has a green-emitting light-emitting element GLED2, and subpixel 260B has a blue-emitting light-emitting element BLED2. In the display device 10, each of the light-emitting elements RLED2, GLED2, and BLED2 may be called an LED chip. 【0069】 The scanning signal line drive circuit 208 and the second driver IC 206 are electrically connected to the control device 300. The scanning signal line drive circuit 208 and the second driver IC 206 use signals and power supply voltage supplied from the control device 300 to drive the transistors (see Figure 5) of each pixel PIX2, for example, to make the light-emitting element RLED2 emit light or not. As a result, the second display panel 200 can display an image (video) on the display unit 204. 【0070】 The configuration and functions of the second display panel 200, including the display section 204, peripheral section 216, substrate 210 including the first surface 212 and the second surface 214, second driver IC 206, scanning signal line drive circuit 208, terminal section 209, FPC 250, pixel PIX2, wiring 224, wiring 226, terminals 215, terminals 218, sub-pixel 260R, sub-pixel 260G, sub-pixel 260B, light-emitting element RLED2, light-emitting element GLED2, and light-emitting element BLED2, are described using Figures 4 to 6. The configuration and function are the same as those of the display panel 100, including the display section 104, peripheral section 116, substrate 110 including the first surface 112 and the second surface 114, first driver IC 106, scanning signal line drive circuit 108, terminal section 111, FPC 150, pixel PIX1, wiring 124, wiring 126, terminals 115, terminals 118, sub-pixel 160R, sub-pixel 160G, sub-pixel 160B, light-emitting element RLED1, light-emitting element GLED1, and light-emitting element BLED1, so a detailed explanation is omitted here. 【0071】 Furthermore, the video signal lines 286a~286f (video signals SL2(1)~SL2(6), SL2(m)), scan signal lines 284a~284c (scan signals SG2(1)~SG2(3), SG2(n)), pixel circuit of pixel PIX2, an example of driving the pixel circuit, and an example of the configuration of pixel PIX2 (video signal line group SL2G, semiconductor layer 271, contact hole 272, contact hole 234, contact hole 238, fifth conductive layer 294, contact hole 236, fourth conductive layer 292, etc.) of the second display panel 200 are described in the first section, as explained using Figures 5 and 6. Since the video signal lines 186a to 186f (video signals SL1(1) to SL1(6), SL1(m)), scan signal lines 184a to 184c (scan signals SG1(1) to SG1(3), SG1(n)), the pixel circuit of pixel PIX1, an example of driving the pixel circuit, and the configuration example of pixel PIX1 (video signal line group SL1G, semiconductor layer 171, contact hole 172, contact hole 134, contact hole 138, fifth conductive layer 194, contact hole 136, fourth conductive layer 192) of the display panel 100 are the same as those of the display panel 100, a detailed explanation is omitted here. 【0072】 <7. Example configuration of the display device 10> Figure 10 is a schematic plan view showing the configuration of the display device 10, including multiple pixels PIX1, PIX2, and wiring (video signal lines 186a-186f, video signal lines 286a-286f, scan signal lines 184a-184b, scan signal lines 284a-284b). In addition, to improve the clarity of the drawing, Figure 10 omits parts other than the multiple pixels PIX1, PIX2, and wiring (video signal lines 186a-186f, video signal lines 286a-286f, scan signal lines 184a-184b, scan signal lines 284a-284b, etc.) included in the display device 10, and shows enlarged parts of the display unit 104 and display unit 204. Figure 11 is an enlarged view of the multiple pixels PIX1, PIX2, and wiring shown in Figure 10. Figure 12 is a cross-sectional view showing the cross-section of the line B1-B2 shown in Figure 11. Configurations identical or similar to those in Figures 1 to 9 will not be explained here. 【0073】 First, an example of the configuration of the display device 10 in a plan view will be explained using Figure 10 or Figure 11. In a plan view of the display device 10, the pixels PIX1 of the first display panel 100 and the pixels PIX2 of the second display panel 200 are arranged alternately in the Y direction. Specifically, pixels PIX1(1,1) and PIX1(2,1) arranged in the X direction, pixels PIX2(1,1) and PIX2(2,1) arranged in the X direction, pixels PIX1(1,2) and PIX1(2,2) arranged in the X direction, and pixels PIX2(1,2) and PIX2(2,2) arranged in the X direction are arranged in this order in the Y direction. 【0074】 The scan signal lines of the first display panel 100 and the scan signal lines of the second display panel 200 are arranged alternately in the Y direction. Specifically, in a plan view of the display device 10, the scan signal lines 184a, 284a, 184b, and 284b are arranged in this order in the Y direction. 【0075】 The video signal lines 186a to 186f of the first display panel 100 and the video signal lines 286a to 286f of the second display panel 200 are superimposed. That is, the video signal line group SL1G and the video signal line group SL2G are superimposed. Specifically, video signal line 186a is superimposed with video signal line 286a, video signal line 186b is superimposed with video signal line 286b, video signal line 186c is superimposed with video signal line 286c, video signal line 186d is superimposed with video signal line 286d, video signal line 186e is superimposed with video signal line 286e, and video signal line 186f is superimposed with video signal line 286f. 【0076】 In the display device 10, pixels PIX1 and PIX2 are arranged offset from each other without overlapping, and the video signal lines of the first display panel 100 and the second display panel 200 are arranged to overlap each other, thereby ensuring the light emission paths of the light-emitting elements included in pixels PIX1 and PIX2. Furthermore, the display device 10 has a higher density of light-emitting elements and higher resolution compared to a display device that includes either the second display panel 200 or the first display panel 100. 【0077】 As will be explained in more detail later, in the area where the light-emitting elements RLED2, GLED2, and BLED2 of pixel PIX2, the insulating layer 140 included in the first display panel 100, and the low-reflection heat dissipation layer 220 and insulating layer 240 included in the second display panel 200 overlap, openings are provided in the insulating layer 140, the low-reflection heat dissipation layer 220, and the insulating layer 240. As a result, the light-emitting elements RLED2, GLED2, and BLED2 of pixel PIX2 can emit light toward the observer 30 (Figure 3). 【0078】 Next, the cross-section of the display device 10 will be explained using Figure 12. As mentioned above, Figure 12 is a cross-sectional view showing the cross-section along line B1-B2 shown in Figure 11, but Figure 12 is a schematic diagram of the cross-section including parts that were omitted in Figures 10 and 11. As mentioned above, in the display device 10, the second display panel 200 is superimposed on the first display panel 100. 【0079】 First, the cross-sectional structure of the first display panel 100 will be described. A low-reflection heat dissipation layer 120 is placed on the first surface 112 of the substrate 110. The low-reflection heat dissipation layer 120 has high thermal conductivity, and its reflectance is 10% or less in the range of visible light wavelengths. The low-reflection heat dissipation layer 120 may be, for example, an anti-reflective film, a film with high diffraction coefficient, or a black resin film containing carbon. 【0080】 The low-reflection heat dissipation layer 120 may have a two-layer structure consisting of a heat dissipation layer and a low-reflection layer. Alternatively, the low-reflection heat dissipation layer 120 may be a substrate with high thermal conductivity and low reflectivity (low-reflection heat dissipation substrate). If the low-reflection heat dissipation layer 120 is a low-reflection heat dissipation substrate, the low-reflection heat dissipation substrate is a different substrate from the substrate 110, and the low-reflection heat dissipation substrate is attached to the substrate 110 using a viscous substance such as a conductive adhesive. 【0081】 A semiconductor layer 171 is placed on the second surface 114 of the substrate 110 via an arbitrary configuration of underlayer 141. The semiconductor layer 171 includes semiconductor films 171a and 171b. A gate wiring layer 184 is placed on top of an insulating layer 142. That is, the insulating layer 142 is placed on top of the semiconductor layer 171 and between the gate wiring layer 184 and the semiconductor layer 171. The gate wiring layer 184 includes scan signal lines 184a and gate electrode 184d. An insulating layer 143 is placed on top of the gate wiring layer 184. A first conductive layer 186 is placed on top of the insulating layer 143. The first conductive layer 186 includes video signal lines 186a to 186f, a source electrode 186g, and a drain electrode 186h. 【0082】 A selection transistor SST and a drive transistor DRT are provided on the second surface 114. The selection transistor SST includes a semiconductor film 171a, a portion of an insulating layer 142, a portion of a scan signal line 184a, and a portion of a video signal line 186b. The portion of the insulating layer 142 functions as the gate insulating film of the selection transistor SST, the portion of the scan signal line 184a functions as the gate electrode of the selection transistor SST, and the portion of the video signal line 186b functions as the source electrode of the selection transistor SST. The drive transistor DRT includes a semiconductor film 171b, a portion of an insulating layer 142, a gate electrode 184d, a source electrode 186g, and a drain electrode 186h. The portion of the insulating layer 142 functions as the gate insulating film of the drive transistor DRT. 【0083】 A portion of the scanning signal line 184a (the gate electrode of the selected transistor SST) is superimposed on the semiconductor film 171a, and the gate electrode 184d is superimposed on the semiconductor film 171b. The region of the semiconductor film that overlaps with the gate electrode is the channel region of each transistor. Each semiconductor film may have a source region and a drain region that sandwich the channel region. The source region or drain region may form a source electrode or a drain electrode. The source electrode or drain electrode may be formed by implanting impurities into the semiconductor layer 171. 【0084】 The video signal line 186b is electrically connected to the semiconductor film 171a via a contact hole 172 that exposes a portion of the insulating layer 143 and insulating layer 142. The source electrode 186g and the drain electrode 186h are electrically connected to the semiconductor film 171b via contact holes 128a and 128b that expose a portion of the insulating layer 143 and insulating layer 142. Although not shown in the diagram, the scan signal line 184a or the gate electrode 184d is electrically connected to an electrode or wiring included in the first conductive layer 186 via a contact hole that exposes a portion of the insulating layer 143. 【0085】 The insulating layer 144, the second conductive layer 188, the insulating layer 145, and the third conductive layer 190 are provided on the first conductive layer 186 in this order. The insulating layer 144 includes contact holes 134 and 132a that expose a portion of the first conductive layer 186. The second conductive layer 188 includes the drive power line PVDD and the electrode 188a. The insulating layer 145 includes contact hole 132b that exposes a portion of the first conductive layer 186. The third conductive layer 190 includes electrode 190a. The drive power line PVDD is electrically connected to the source electrode 186g via contact hole 134. The third conductive layer 190 is electrically connected to the drain electrode 186h via contact holes 132b and 132a. Note that electrode 188a or electrode 190a may be wiring. 【0086】 The insulating layer 146 is provided on the insulating layer 145 and the third conductive layer 190. The fourth conductive layer 192 and the fifth conductive layer 194 are provided on the insulating layer 146 in this order. The insulating layer 146 includes a contact hole 136 that exposes a portion of the third conductive layer 190. The fourth conductive layer 192 includes a reference potential line PVSS and an electrode 192a. The fifth conductive layer 194 includes a junction electrode 194a and a junction electrode 194b. Electrode 192a is electrically connected to electrode 190a via the contact hole 136. The junction electrode 194a is electrically connected to the reference potential line PVSS, and the junction electrode 194b is electrically connected to electrode 192a. Note that electrode 192a, junction electrode 194a, or junction electrode 194b may be wiring. 【0087】 The light-emitting element GLED1 is electrically connected to the junction electrode 194b. In the first display panel 100, the junction electrode 194b is the anode electrode. 【0088】 The insulating layer 147 is positioned on the light-emitting element GLED1, the insulating layer 146, the fourth conductive layer 192, and the fifth conductive layer 194, such that the light-emitting element GLED1 is embedded within the insulating layer 147. The sixth conductive layer 196 is positioned on the insulating layer 147. The insulating layer 147 includes a contact hole 138 through which a portion of the fifth conductive layer 194 is exposed. The sixth conductive layer 196 includes an electrode 196a. The electrode 196a is electrically connected to the junction electrode 194a via the contact hole 138. The electrode 196a is electrically connected to the reference potential line PVSS via the junction electrode 194a. In the first display panel 100, the electrode 196a is the cathode electrode. 【0089】 The insulating layer 148 is positioned between the insulating layer 140, which functions as a low-reflection heat dissipation layer, and the insulating layer 147, and is in contact with the insulating layer 147 while covering the sixth conductive layer 196. 【0090】 An insulating layer 140 is placed on top of an insulating layer 147. The insulating layer 140 has the function of covering, for example, wiring or electrodes. The insulating layer 140 includes an opening 149 so that light emitted from the light-emitting element can pass through to the observer. For example, the diameter of the opening 149 is length W1, and the width of the light-emitting element GLED1 is width LW1. In the first display panel 100, length W1 is smaller than width LW1, so that a portion of the light emitted from the light-emitting element GLED1 is blocked and the amount of light can be reduced. The insulating layer 140 may be formed using the same material as the low-reflection heat dissipation layer 120 and may have the same configuration and function. That is, the insulating layer 140 may be a heat dissipation layer (third heat dissipation layer). 【0091】 For example, metals such as aluminum (Al), titanium (Ti), molybdenum (Mo), copper (Cu), or tungsten (W), or alloys thereof, can be used as the material for the gate wiring layer 184 and the first conductive layer 186. Furthermore, the gate wiring layer 184 and the first conductive layer 186 can be single-layer or multi-layer. 【0092】 As the material for the second conductive layer 188, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) can be used. 【0093】 The third conductive layer 190 can function as a wiring layer for connecting the first conductive layer 186 and the fourth conductive layer 192. The material of the third conductive layer 190 can be, for example, the same material as that used for the gate wiring layer 184 and the first conductive layer 186. The third conductive layer 190 can also be a single layer or a multilayer, similar to the gate wiring layer 184 or the first conductive layer 186. 【0094】 The fourth conductive layer 192 can function as an electrode pad for mounting the light-emitting element. The fourth conductive layer 192 can also function as a reflective layer that reflects light emitted by the light-emitting element. The material of the fourth conductive layer 192 can be, for example, the same material as that used for the gate wiring layer 184 and the first conductive layer 186. Furthermore, the fourth conductive layer 192 can be a single layer or a multilayer, similar to the gate wiring layer 184 or the first conductive layer 186. 【0095】 The fifth conductive layer 194 can function as a bonding layer for joining the light-emitting elements. As the material for the fifth conductive layer 194, for example, tin, silver paste, solder, or an anisotropic conductive film (ACF) can be used. 【0096】 The sixth conductive layer 196 can function, for example, as the cathode electrode of the light-emitting element BLED2, or as a wiring layer for routing the cathode electrode. Alternatively, the sixth conductive layer 196 can function as a transparent layer that transmits light emitted by the light-emitting element. As the material for the sixth conductive layer 196, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) can be used. 【0097】 The insulating layer 142 separates the semiconductor layer 171 and the gate wiring layer 184, preventing a short circuit between them. For example, silicon oxide (SiO2) can be used as the material for the insulating layer 142. x ), silicon oxide nitride (SiO x N y ), silicon nitride (SiN x), or an inorganic insulating material such as silicon oxynitride (SiN x Oy) can be used. Here, SiO x N y is a silicon compound containing nitrogen (N) in an amount less than that of oxygen (O). SiN x Oy is a silicon compound containing oxygen in an amount less than that of nitrogen. 【0098】 The insulating layer 143 is disposed on the unevenness caused by transistors and other semiconductor elements and has a function of forming a flat surface. As the material of the insulating layer 143, an organic compound material selected from acrylic, polyimide, etc., which are excellent in flatness of the film surface, can be used. 【0099】 The insulating layer 145 can separate the second conductive layer 188 and the third conductive layer 190 so that the second conductive layer 188 and the third conductive layer 190 do not short-circuit. As the material of the insulating layer 145, for example, silicon oxide (SiO x ), silicon oxynitride (SiO x N y ), silicon nitride (SiN x ), silicon oxynitride (SiN x O y ), aluminum oxide (AlO x ), aluminum oxynitride (AlO x N y ), aluminum nitride oxide (AlN x O y ), or aluminum nitride (AlN x ) and other inorganic insulating materials can be used. Here, AlO x N y is an aluminum compound containing nitrogen (N) in an amount less than that of oxygen (O). AlN x O yThis is an aluminum compound containing less oxygen than nitrogen. Furthermore, the insulating layer 145 can use not only inorganic insulating materials but also organic insulating materials. Examples of organic insulating materials include polyimide resin, acrylic resin, epoxy resin, silicone resin, fluororesin, or siloxane resin. The insulating layer 145 may use the inorganic insulating layer material and the organic insulating material individually, or they may be laminated together. 【0100】 The insulating layers 144, 146, and 148 are positioned on top of the irregularities of the layers below them, and have the function of forming a flat surface. In addition, insulating layer 144 has the function of separating the video signal lines 186a to 186f from each other and separating the video signal lines 186a to 186f from other conductive layers. As the material for insulating layers 144, 146, and 148, for example, organic resins such as polyimide resin, acrylic resin, epoxy resin, silicone resin, fluororesin, or siloxane resin can be used. The insulating layers 144, 146, or 148 may be made of organic resin alone or in a laminated configuration. Furthermore, insulating layer 148 may be an insulating adhesive for bonding insulating layer 140 to insulating layer 147 and the sixth conductive layer 196. Moreover, similar to the low-reflection heat dissipation layer 120, insulating layers 140 and 148 can also have a two-layer structure consisting of a heat dissipation layer and a low-reflection layer. 【0101】 The insulating layer 147 has the function of reducing steps in the light-emitting element and other components beneath the sixth conductive layer when forming the sixth conductive layer, thereby forming a flat surface. As the material for the insulating layer 147, for example, a photosensitive organic material such as photosensitive acrylic or photosensitive polyimide can be used. 【0102】 Next, the cross-sectional structure of the second display panel 200 will be described. In describing the cross-sectional structure of the second display panel 200, descriptions of configurations and functions that are the same as or similar to those of the first display panel 100 will be omitted, and the differences from the cross-sectional structure of the first display panel 100 will be described mainly. 【0103】 In the second display panel 200, the substrate 210, underlayer 241, semiconductor layer 271, gate wiring layer 284, insulating layer 243, first conductive layer 286, insulating layer 244, second conductive layer 288, insulating layer 245, third conductive layer 290, insulating layer 246, fourth conductive layer 292, fifth conductive layer 294, and insulating layer 247 are stacked in this order. 【0104】 Substrate 210 including the first surface 212 and second surface 214 of the second display panel 200, semiconductor layer 271, underlayer 241, semiconductor film 271a, semiconductor film 271b, gate wiring layer 284, insulating layer 242, scanning signal line 284a, gate electrode 284d, insulating layer 243, first conductive layer 286, video signal lines 286a~286f, source electrode 286g, drain electrode 286h, configuration of selection transistor SST and drive transistor DRT, insulating layer 244, second conductive layer 288, insulating layer The configurations and functions of components such as 245, the third conductive layer 290, contact hole 234, contact hole 232a, drive power line PVDD, electrode 288a, contact hole 232b, electrode 290a, contact hole 172, insulating layer 246, fourth conductive layer 292, fifth conductive layer 294, contact hole 236, reference potential line PVSS, electrode 292a, electrode 294a, electrode 294b, insulating layer 247, and contact hole 238 are as described in the first indication explained with reference to Figure 12. The configuration of the panel 100 includes a substrate 110 with a first surface 112 and a second surface 114, a semiconductor layer 171, a base layer 141, a semiconductor film 171a, a semiconductor film 171b, a gate wiring layer 184, an insulating layer 142, a scanning signal line 184a, a gate electrode 184d, an insulating layer 143, a first conductive layer 186, video signal lines 186a to 186f, a source electrode 186g, a drain electrode 186h, a selection transistor SST and a drive transistor DRT, an insulating layer 144, a second conductive layer 188, an insulating layer 145, and a third Since the configuration and function are the same as those of the conductive layer 190, contact hole 134, contact hole 132a, drive power line PVDD, electrode 188a, contact hole 132b, electrode 190a, contact hole 172, insulating layer 146, fourth conductive layer 192, fifth conductive layer 194, contact hole 136, reference potential line PVSS, electrode 192a, junction electrode 194a, junction electrode 194b, insulating layer 147, and contact hole 138, a detailed explanation is omitted here. 【0105】 In the second display panel 200, a low-reflection heat dissipation layer 220 is placed on the first surface 212 of the substrate 210, a light-emitting element GLED2 is electrically connected to the electrode 294b, and an insulating layer 240 is placed on top of the insulating layer 247. The electrode 294b is the anode electrode. 【0106】 The low-reflection heat dissipation layer 220 includes an opening 211. The opening 211 is provided in the low-reflection heat dissipation layer 220 so as to overlap with the opening 149 and the light-emitting element GLED1 of the first display panel 100. The diameter of the opening 211 is length W2. Length W2 is smaller than length W1 and width LW1, and can block a portion of the light emitted by the light-emitting element GLED1, thereby reducing the amount of light. In the display device 10, the low-reflection heat dissipation layer 220 is arranged so as to overlap the entire surface of the first surface 212, except for the opening 211. The configuration and functions of the low-reflection heat dissipation layer 220 other than those described above are the same as those of the low-reflection heat dissipation layer 120, so a detailed explanation is omitted here. 【0107】 The insulating layer 240 has the function of covering, for example, wiring or electrodes. The insulating layer 240 also includes an opening 249b to allow light emitted from the light-emitting element GLED1 or the light emitted from the light-emitting element to pass towards the observer, and an opening 249a to allow light emitted from the light-emitting element GLED2 to pass towards the observer. 【0108】 The opening 249b is provided in the insulating layer 240 so as to overlap with the opening 149 and the light-emitting element GLED1 of the first display panel 100, as well as the opening 211. The opening 249a is provided in the insulating layer 240 so as to overlap with the light-emitting element GLED2. 【0109】 For example, the diameter of the opening 249b is length W3, the diameter of the opening 249a is length W4, and the width of the light-emitting element GLED2 is width LW2. In the second display panel 200, length W3 is smaller than width LW1, length W1, and length W2, so that it can block a portion of the light emitted by the light-emitting element GLED1 and reduce the amount of light. Also, length W4 is smaller than width LW2, so that it can block a portion of the light emitted by the light-emitting element GLED2 and reduce the amount of light. The other configurations and functions of the insulating layer 240 may be the same as those of the low-reflection heat dissipation layer 120. That is, the insulating layer 240 may be a heat dissipation layer (fourth heat dissipation layer) or a low-reflection heat dissipation layer. 【0110】 In the display device 10, the distance between the first display panel 100 and the observer 30 is longer than the distance between the second display panel 200 and the observer 30. In the display device 10, the size of the light-emitting elements arranged on the first display panel 100 (e.g., the width LW1 of the light-emitting element RLED1) is smaller than the size of the light-emitting elements arranged on the second display panel 200 (e.g., the width LW2 of the light-emitting element RLED2). Generally, a larger light-emitting element results in better luminous efficiency. Therefore, by increasing the size of the light-emitting elements at positions farther from the observer 30, it is possible to ensure that the same amount of light reaches the observer 30 from the light-emitting elements, regardless of the distance between the observer 30 and the light-emitting elements. 【0111】 The insulating layer 248 is placed between the insulating layer 240 and the insulating layer 247. Since the insulating layer 248 has the same structure and function as the insulating layer 148, a detailed description of the insulating layer 248 is omitted, but the insulating layer 248 may be an insulating adhesive for bonding the insulating layer 240 to the insulating layer 247 and the sixth conductive layer 296. 【0112】 <8. An example of the display method of the display device 10> Figure 13 is a diagram showing the control device 300 in the display device 10 as a functional block. Figure 14 is a flowchart illustrating the display method of the display device 10. Figure 15 is a timing chart illustrating the display method of the display device 10. Configurations identical or similar to those in Figures 1 to 12 are omitted from this explanation. 【0113】 The display device 10 includes, for example, two display panels (a first display panel 100 and a second display panel 200). By including two display panels, the display device 10 can choose to use only the first display panel 100, or to use both the first display panel 100 and the second display panel 200, depending on the resolution of the video signal. In other words, the display device 10 can change its resolution according to the resolution of the video signal. 【0114】 The display device 10 may include three or more display panels. If the display device 10 includes three or more display panels, the display device 10 can display even higher resolution images depending on the resolution supported by the video signal. 【0115】 An example of a display method (resolution change display method) for changing the resolution of the display device 10 will be explained using Figures 13 to 15. 【0116】 First, the functional block configuration of the display device 10 will be explained using Figure 13. As explained in "2. Configuration of the first display panel 100 and control device 300" or "6. Configuration of the second display panel 200 and control device 300", the control device 300 is electrically connected to the first driver IC 106 and the second driver IC 206. The first driver IC 106 is electrically connected to the first display panel 100, and the second driver IC 206 is electrically connected to the second display panel 200. 【0117】 As shown in Figure 13, the control device 300 includes a display selection circuit 330 (Figure 1), a resolution comparison and determination circuit 320, and a display panel control circuit 310. The display panel control circuit 310 includes, for example, a video signal transmission circuit 312, a video signal distribution circuit 314, and a control signal transmission circuit 316. 【0118】 The display selection circuit 330 has the function of selecting the display method of the display device 10. For example, if the display device 10 has multiple display methods, the user can select the resolution change display method from among the multiple display methods using an input function (not shown in the figure). Based on the input signal MODE transmitted from the input function, the display selection circuit 330 selects the resolution change display method (MODE1), and the display device 10 can start the resolution change display method. 【0119】 The resolution comparison and determination circuit 320 has the function of comparing and determining resolution. Specifically, the resolution comparison and determination circuit 320 compares the resolution that the second display panel 200 can display with the resolution corresponding to the video signal. The resolution comparison and determination circuit 320 also generates the comparison result and transmits a first control signal to the video signal transmission circuit 312. The first control signal includes the comparison result data. As will be described in detail later, if the resolution that the second display panel 200 can display is smaller than the resolution corresponding to the video signal, the resolution comparison and determination circuit 320 generates a first comparison result. If the resolution that the second display panel 200 can display is equal to or greater than the resolution corresponding to the video signal, the resolution comparison and determination circuit 320 generates a second comparison result. 【0120】 The video signal transmission circuit 312 has the function of determining the destination of the video signal. Specifically, the video signal transmission circuit 312 determines, in response to the first control signal, whether to transmit the video signal to the second display panel 200 or to the first display panel 100 and the second display panel 200, and transmits the second control signal and the video signal to the video signal distribution circuit 314 or the control signal transmission circuit 316. The second control signal includes data on the destination of the video signal. As will be described in detail later, if the first control signal includes data on the second comparison result, the video signal transmission circuit 312 determines the destination of the video signal to be the second display panel 200 and transmits the second control signal and the video signal to the control signal transmission circuit 316. If the first control signal includes data on the first comparison result, the video signal transmission circuit 312 determines the destination of the video signal to be the first display panel 100 and the second display panel 200 and transmits the second control signal and the video signal to the video signal distribution circuit 314. 【0121】 The control signal transmission circuit 316 has the function of generating and transmitting signals to control the first driver IC 106 and the second driver IC 206 based on the second control signal and the video signal. Specifically, when the video signal transmission circuit 312 determines that the destination of the video signal is the second display panel 200, the control signal transmission circuit 316 generates a third control signal based on the second control signal and the video signal to synchronize the second display panel 200 and the first display panel 100, supply the video signal to the second display panel 200, and not drive the first display panel 100, and transmits the video signal and the third control signal to the second driver IC 206 and the first driver IC 106. Furthermore, when the video signal transmission circuit 312 determines that the destinations for transmitting the video signal are the first display panel 100 and the second display panel 200, the control signal transmission circuit 316 generates a synchronization signal to synchronize the second display panel 200 and the first display panel 100 based on the second control signal and the video signal, and transmits the synchronization signal to the video signal distribution circuit 314. 【0122】 The video signal distribution circuit 314 has the function of distributing the video signal into a first video signal for display on the first display panel 100 and a second video signal for display on the second display panel 200, based on the second control signal, the video signal, and the synchronization signal. The video signal distribution circuit 314 also has the function of generating and transmitting signals to control the second driver IC 206 and the first driver IC 106, based on the first video signal, the second video signal, and the synchronization signal. Specifically, when the video signal transmission circuit 312 determines that the destinations for transmitting the video signal are the first display panel 100 and the second display panel 200, the video signal distribution circuit 314 distributes the video signal into the first video signal and the second video signal according to the resolution corresponding to the video signal, based on the current distance (distance H1) between the first display panel and the second display panel 200. For example, among the multiple video signals, the video signal corresponding to pixel PIX1 connected to scan signal line 184a is distributed to the first display panel 100 as the first video signal (video signal SL1(1)), and the video signal corresponding to pixel PIX2 connected to scan signal line 284a is distributed to the second display panel 200 as the second video signal (video signal SL2(1)). The video signal distribution circuit 314 also generates a fourth control signal, other than the synchronization signal, for supplying the first video signal and the second video signal to the first display panel 100 and the second display panel 200, based on the first and second video signals. Furthermore, the video signal distribution circuit 314 transmits the first video signal, the second video signal, and the fourth control signal, including the synchronization signal, to the second driver IC 206 and the first driver IC 106. 【0123】 The third and fourth control signals include signals (synchronization signals) for synchronizing the driving of the first display panel 100 and the second display panel 200, respectively. The synchronization signals include, for example, a horizontal synchronization signal that controls driving in the direction parallel to the scan signal lines (X direction) and a vertical synchronization signal that controls driving in the direction parallel to the video signal lines (Y direction). The third control signal also includes a first synchronization signal and a third synchronization signal for synchronizing the driving timing of the second display panel 200 and the first display panel 100, supplying a video signal to the second display panel 200, and not driving the first display panel 100. The fourth control signal includes a first synchronization signal and a second synchronization signal for synchronizing the driving timing of the second display panel 200 and the first display panel 100, supplying a second video signal to the second display panel 200, and supplying a first video signal to the first display panel 100. 【0124】 Next, we will explain the flow of the resolution change display method using Figure 14. 【0125】 For example, a resolution change display method (MODE1) for the display device 10 is selected based on the input signal MODE. The display device 10 starts driving to perform the resolution change display. 【0126】 In step 10 (S10), the display device 10 compares and determines the resolution using the resolution comparison and determination circuit 320. For example, if the resolution that the second display panel 200 can display is equal to or greater than the resolution of the video signal, the display device 10 executes step 12 (S12). If the resolution that the second display panel 200 can display is less than the resolution of the video signal, the display device 10 executes step 22 (S22). 【0127】 In step 12 (S12), the resolution comparison and determination circuit 320 generates a second comparison result and transmits a first control signal including the second comparison result to the video signal transmission circuit 312. 【0128】 In step 14 (S14), the video signal transmission circuit 312 determines the destination of the video signal to be the second display panel 200 based on the first control signal, which includes the second comparison result. The video signal transmission circuit 312 also transmits the second control signal and the video signal to the control signal transmission circuit 316. The second control signal includes data indicating that the destination of the video signal is the second display panel 200. 【0129】 In step 16 (S16), the control signal transmission circuit 316 generates a third control signal based on the second control signal and the video signal. As described above, the third control signal includes a horizontal synchronization signal, a vertical synchronization signal, a first synchronization signal, and a third synchronization signal. The control signal transmission circuit 316 transmits the third control signal to the first driver IC 106 and the second driver IC 206, and transmits the video signal to the second driver IC 206. 【0130】 In step 22 (S22), the resolution comparison and determination circuit 320 generates a second comparison result and transmits a first control signal including the second comparison result to the video signal transmission circuit 312. 【0131】 In step 24 (S24), the video signal transmission circuit 312 determines the destinations for the video signal to be the first display panel 100 and the second display panel 200 based on the first control signal, which includes the first comparison result. The video signal transmission circuit 312 also transmits the second control signal and the video signal to the video signal distribution circuit 314. The second control signal includes data indicating that the destinations for the video signal are the first display panel 100 and the second display panel 200. 【0132】 In step 26 (S26), the control signal transmission circuit 316 generates a synchronization signal based on the second control signal and the video signal, and transmits the synchronization signal to the video signal distribution circuit 314. Based on the synchronization signal, the second control signal, and the video signal, the video signal distribution circuit 314 distributes the video signal to the first video signal and the second video signal according to the resolution corresponding to the video signal, at the current distance (distance H1) between the first display panel and the second display panel 200. 【0133】 In step 28 (S28), the video signal distribution circuit 314 generates a fourth control signal, excluding the synchronization signal, based on the first video signal and the second video signal. The video signal distribution circuit 314 transmits the fourth control signal, including the synchronization signal, and the first video signal to the first driver IC 106, and transmits the fourth control signal, including the synchronization signal, and the second video signal to the second driver IC 206. 【0134】 In step 60 (S60), following steps 16 (S16) and 28 (S28), the first driver IC 106 and the second driver IC 206 control the first display panel 100 and the second display panel 200 based on the signals received by the first driver IC 106 and the second driver IC 206, and either the first display panel 100 or the second display panel 200 displays an image. 【0135】 Next, Figure 15 will be used to explain the timing chart of the resolution change display method. The resolution change display method of the display device 10 includes a display method selection period and a display period. In the example of the resolution change display method of the display device 10, one frame of video consists of video signals corresponding to six scan signal lines. 【0136】 During the display method selection period, the resolution change display method (MODE1) is selected based on the pulse of the input signal MODE. The display device 10 starts driving to perform the resolution change display. A pulse of the first control signal is generated based on the pulse of the input signal MODE. A pulse of the second control signal is generated based on the pulse of the first control signal. 【0137】 The display device 10 knows the resolutions that the first display panel 100 can display, the resolutions that the second display panel 200 can display, and the resolutions that the video signal corresponds to. In the display device 10, a pulse is, for example, a pulse that changes from an L level to an H level. 【0138】 During the display period, if the first control signal includes the second comparison result (that the resolution that the second display panel 200 can display is equal to or greater than the resolution corresponding to the video signal), the video is displayed on the second display panel 200, and the video is not displayed on the first display panel 100. 【0139】 If the first control signal includes the second comparison result, a third control signal (vertical synchronization signal, horizontal synchronization signal, first synchronization signal, and third synchronization signal) is generated based on the pulse of the second control signal. The first synchronization signal is transmitted to the second display panel 200, and the third synchronization signal (a signal that is always at an L level) is transmitted to the first display panel 100. Since the third synchronization signal is always at an L level, the first display panel 100 is not driven, and no image is displayed on the first display panel 100. 【0140】 Based on the pulse of the first synchronization signal, the first display panel 100 becomes displayable, and based on the first pulse of the vertical synchronization signal and the first pulse of the horizontal synchronization signal, the video signal SL2(n) corresponding to the first line of the video signal of the first frame (scan signal SG2(1)) is transmitted to the second display panel 200 and displayed. Similarly, the video signals SL2(n) corresponding to the second to sixth lines of the video signal of the first frame are transmitted to the second display panel 200 and the video of the first frame is displayed. The timing chart for the second frame and subsequent frames is the same as for the first frame, and is therefore omitted from this explanation. 【0141】 As explained above, when the resolution that the second display panel 200 can display is equal to or greater than the resolution of the video signal, the second display panel 200 displays the image, and the first display panel 100 does not. In other words, the display device 10 can display the image using only the second display panel 200 closest to the observer 30 (see Figure 3), depending on the resolution that the second display panel 200 can display and the resolution of the video signal. 【0142】 Furthermore, during the display period, if the first control signal includes the first comparison result (the resolution that the second display panel 200 can display is smaller than the resolution corresponding to the video signal), then, at the current distance between the first display panel and the second display panel 200 (distance H1), the video is displayed on both the second display panel 200 and the first display panel 100 according to the resolution corresponding to the video signal. 【0143】 If the first control signal includes the first comparison result, a fourth control signal (vertical synchronization signal, horizontal synchronization signal, first synchronization signal, and second synchronization signal) is generated based on the pulse of the second control signal. In the display device 10, the scan signal lines SG1(n) of the first display panel 100 and the scan signal lines SG2(n) of the second display panel 200 are arranged alternately in the Y direction, so the video signal is distributed row by row based on, for example, the vertical synchronization signal, the horizontal synchronization signal, and the video signal. 【0144】 For example, based on the first pulse of the vertical synchronization signal, the first, third, and fifth pulses of the horizontal synchronization signal, the video signals SL1(n) corresponding to the first row (scan signal SG1(1)), third row (scan signal SG1(2)), and fifth row (scan signal SG1(3)) of the video signal in the first frame are distributed to the first video signal. Also, for example, based on the first pulse of the vertical synchronization signal, the second, fourth, and sixth pulses of the horizontal synchronization signal, the video signals SL2(n) corresponding to the second row (scan signal SG2(1)), fourth row (scan signal SG2(2)), and sixth row (scan signal SG2(3)) of the video signal in the first frame are distributed to the second video signal. 【0145】 A first synchronization signal and a first video signal are transmitted to the first display panel 100, and a second synchronization signal and a second video signal are transmitted to the second display panel 200. Based on the pulse of the first synchronization signal, the first display panel 100 becomes displayable and can display video based on the first video signal. Similarly, based on the pulse of the second synchronization signal, the second display panel 200 becomes displayable and can display video based on the second video signal. The timing chart for the second frame and subsequent frames is the same as for the first frame, and is therefore omitted from this explanation. 【0146】 As explained above, when the resolution that the second display panel 200 can display is smaller than the resolution that the video signal corresponds to, both the second display panel 200 and the first display panel 100 can display an image at the current distance between the first display panel and the second display panel 200 (distance H1), depending on the resolution that the video signal corresponds to. In other words, the display device 10 can achieve a high density of light-emitting elements and a high-definition image by displaying an image (video) on both the second display panel 200 and the first display panel 100, depending on the resolution that the second display panel 200 can display and the resolution that the video signal corresponds to. 【0147】 Furthermore, as explained above, the display device 10 can select to display an image (video) only on the second display panel 200, or to display an image (video) on both the second display panel 200 and the first display panel 100, depending on the resolution that the second display panel 200 can display and the resolution that the video signal corresponds to. In other words, the display device 10 can change the number of panels on which an image is displayed, depending on the resolution that the second display panel 200 can display and the resolution that the video signal corresponds to. As a result, the display device 10 can change the density of the light-emitting elements of the display device and the resolution of the display device, depending on the resolution that the second display panel 200 can display and the resolution that the video signal corresponds to. 【0148】 <9. Modified example of the low-reflection heat dissipation layer 220> Modified examples of the low-reflection heat dissipation layer 220 will be described. Figures 16, 17, and 18 show modified examples of the low-reflection heat dissipation layer 220 included in the second display panel 200. Configurations identical or similar to those in Figures 1 to 15 will not be described here. 【0149】 In the low-reflection heat dissipation layer 220 shown in Figure 16, the low-reflection heat dissipation layers 220a, 220b, and 220c are arranged on the first surface 212 (see Figure 2) so as to overlap the scan signal line 284a, scan signal line 284b, light-emitting elements near the scan signal line, and video signal lines 286a to 286f, and extend in the X direction. The low-reflection heat dissipation layer 220 includes a plurality of slits 417 between the low-reflection heat dissipation layers 220a and 220b, and between the low-reflection heat dissipation layers 220b and 220c, where the low-reflection heat dissipation layer 220 is not arranged in the X direction of the first surface 212. The low-reflection heat dissipation layers 220a, 220b, and 220c surround the periphery of the opening 211. 【0150】 In the low-reflection heat dissipation layer 220 shown in Figure 17, the low-reflection heat dissipation layer 220d and the low-reflection heat dissipation layer 220e are arranged on the first surface 212 so as to extend in the Y direction, and a slit 417b in which the low-reflection heat dissipation layer 220 is not arranged is included between the low-reflection heat dissipation layer 220d and the low-reflection heat dissipation layer 220e. The low-reflection heat dissipation layer 220d and the low-reflection heat dissipation layer 220e surround the periphery of the opening 211. 【0151】 In the low-reflection heat dissipation layer 220 shown in Figure 18, the low-reflection heat dissipation layer 220f, low-reflection heat dissipation layer 220g, and low-reflection heat dissipation layer 220h are arranged on the first surface 212 so as to overlap the scan signal line 284a, scan signal line 284b, light-emitting elements near the scan signal line, and video signal lines 286a to 286f, and extend in an oblique direction intersecting the X and Y directions. Multiple slits 417c where the low-reflection heat dissipation layer 220 is not located are included between the low-reflection heat dissipation layer 220f and the low-reflection heat dissipation layer 220g, and between the low-reflection heat dissipation layer 220g and the low-reflection heat dissipation layer 220h. The low-reflection heat dissipation layers 220f, 220g, and 220h surround the periphery of the opening 211. 【0152】 As shown in Figures 16 to 18, even if the low-reflection heat dissipation layer 220 includes slits, the low-reflection heat dissipation layer 220 is connected to the housing, so that the heat generated in conjunction with the display of the first display panel 100 and the second display panel 200 can be dissipated to the housing 400 via the low-reflection heat dissipation layer 220. Note that slits are sometimes called grooves. 【0153】 <10. Variations of the arrangement of pixel PIX1 and pixel PIX2> This section describes variations in the arrangement of pixel PIX1. Figures 19(A), 19(B), and 19(C) show variations in the arrangement of pixel PIX1. Configurations identical or similar to those in Figures 1 to 18 are omitted from this explanation. 【0154】 Figure 19(A) shows a pixel array in which pixels PIX1 are arranged in a matrix in the X and Y directions, while subpixels 160R, 160G, and 160B are arranged in the Y direction. Figure 19(A) is a pixel array so-called a stripe array. 【0155】 Figure 19(B) shows a pixel array in which pixels PIX1 are arranged in a matrix in the X and Y directions, while subpixels 160R, 160G, and 160B are each shifted by one subpixel in the X direction and arranged diagonally in directions that intersect the X and Y directions. Figure 19(B) is a pixel array so-called a mosaic array. 【0156】 Figure 19(B) shows a pixel array in which pixels PIX1 are arranged in a matrix in the X and Y directions, while subpixels 160R, 160G, and 160B are each shifted by one subpixel in the X direction and arranged diagonally in directions that intersect the X and Y directions. Figure 19(B) is a pixel array so-called a mosaic array. 【0157】 Figure 19(C) shows a pixel array in which pixel PIX1 is arranged alternately in the X and Y directions, with subpixels 160R, 160G, and 160B arranged to form an inverted triangle (Pixel PIX1C) and subpixels 160R, 160G, and 160B arranged to form a triangle (Pixel PIX1D). Figure 19(C) is a pixel array so-called a delta array. 【0158】 Pixel PIX2 may be arranged in the same way as the arrangement described using Figures 19(A) to 19(C). 【0159】 As explained above, pixels PIX1 and PIX2 can be arranged in various ways. 【0160】 <Second Embodiment> In the second embodiment, a display method of the display device 11 different from that of the first embodiment will be described. Figure 20 is a diagram in which the control device 301 is shown as a functional block in the display method of the display device 11 according to the second embodiment of the present invention. Figure 21 is a flowchart for explaining the display method of the display device 11. In the description of the display device 11, explanations similar to those for the display device 10 may be omitted. 【0161】 First, the functional block configuration of the display device 11 will be explained using Figure 21. As shown in Figure 21, the control device 301 includes a display selection circuit 330, a distance measuring device 340, a display panel distance changing device 350, and a display panel control circuit 310. The display panel control circuit 310 includes a control signal transmission circuit 317 and a video signal distribution circuit 315. 【0162】 The display selection circuit 330, like the display device 10, has the function of selecting the display method of the display device 11. For example, if the display device 11 has multiple display methods, the user can select between the stereoscopic display method and the normal display method from among the multiple display methods using an input function (not shown in the figure). Based on the input signal MODE transmitted from the input function, the display selection circuit 330 selects either the stereoscopic display method (MODE2) or the normal display method (MODE3), and the display device 11 can start either the stereoscopic display method or the normal display method. The display selection circuit 330 also has the function of transmitting the input signal MODE2 containing the data for the stereoscopic display method to the distance measuring device 340, and transmitting the input signal MODE3 containing the data for the normal display method to the control signal transmission circuit 317 and the video signal distribution circuit 315. 【0163】 The distance measuring device 340 has the function of measuring the distance between the observer 30 and the display device 11. Specifically, the distance measuring device 340 includes a distance sensor capable of measuring the distance between the observer 30 and the display device 11. The distance measuring device 340 generates the result of measuring the distance between the observer 30 and the display device 11 (distance H3) and transmits the distance measurement signal to the display panel distance changing device 350. The distance measurement signal includes the distance H3 data. 【0164】 The inter-display panel distance changing device 350 has the function of changing the distance between the first display panel 100 and the second display panel 200. Specifically, the inter-display panel distance changing device 350 generates a distance change signal in response to a distance measurement signal. The inter-display panel distance changing device 350 also changes the distance H1 between the first display panel 100 and the second display panel 200 to distance H4 based on the distance change signal. Furthermore, the inter-display panel distance changing device 350 transmits the distance change signal to the control signal transmission circuit 317 and the video signal distribution circuit 315. The distance change signal includes data for distance H4. 【0165】 The control signal transmission circuit 317 has the function of generating and transmitting signals to control the first driver IC 106 and the second driver IC 206 based on the input signal MODE3 or the distance change signal. Specifically, when the control signal transmission circuit 317 receives the input signal MODE3 or the distance change signal, it generates a synchronization signal to synchronize the second display panel 200 and the first display panel 100, and transmits the video signal and the synchronization signal to the video signal distribution circuit 315. 【0166】 The video signal distribution circuit 315 has the function of distributing the video signal into a first video signal for display on the first display panel 100 and a second video signal for display on the second display panel 200, based on the distance change signal, the video signal and the synchronization signal, or the input signal MODE3, the video signal and the synchronization signal. The video signal distribution circuit 315 also has the function of generating and transmitting signals for controlling the second driver IC 206 and the first driver IC 106, based on the distance change signal, the video signal and the synchronization signal, or the input signal MODE3, the video signal and the synchronization signal. 【0167】 Specifically, when the video signal distribution circuit 315 receives the distance change signal, the video signal, and the synchronization signal, it distributes the video signal into a first video signal and a second video signal according to the resolution corresponding to the video signal, based on the measured distance (distance H4) between the first display panel and the second display panel 200. It also generates a fifth control signal, other than the synchronization signal, for supplying the first video signal and the second video signal to the first display panel 100 and the second display panel 200. Furthermore, the video signal distribution circuit 315 transmits the fifth control signal, including the first video signal, the second video signal, and the synchronization signal, to the second driver IC 206 and the first driver IC 106. 【0168】 Furthermore, upon receiving the input signal MODE3, the video signal, and the synchronization signal, the video signal distribution circuit 315 distributes the video signal into a first video signal and a second video signal according to the resolution corresponding to the video signal, based on the current distance (distance H1) between the first display panel and the second display panel 200. It also generates a sixth control signal, other than the synchronization signal, for supplying the first video signal and the second video signal to the first display panel 100 and the second display panel 200. In addition, the video signal distribution circuit 315 transmits the sixth control signal, including the first video signal, the second video signal, and the synchronization signal, to the second driver IC 206 and the first driver IC 106. 【0169】 The fifth and sixth control signals include signals (synchronization signals) for synchronizing the driving of the first display panel 100 and the second display panel 200, respectively. The fifth and sixth control signals also include a first synchronization signal and a second synchronization signal for synchronizing the driving timing of the second display panel 200 and the first display panel 100, and for supplying a second video signal to the second display panel 200 and a first video signal to the first display panel 100. 【0170】 The synchronization signal, the first synchronization signal, and the second synchronization signal are signals having the same functions and configuration as the control device 300 according to the first embodiment. 【0171】 Next, Figure 21 will be used to explain the flowcharts for the 3D display method and the normal display method. 【0172】 For example, based on the input signal MODE, the display device 11 selects either a stereoscopic display method (MODE2) or a normal display method (MODE3). 【0173】 In step 30 (S10), the display device 11 selects a display method using the display selection circuit 330. If the input signal MODE is input signal MODE2, which contains data for the stereoscopic display method (MODE2), the display device 10 selects the stereoscopic display method (MODE2) (YES in step 30 (S10)) and executes step 32 (S32). If the input signal MODE is input signal MODE3, which contains data for the normal display method (MODE3), the display device 10 selects the normal display method (MODE3) (NO in step 30 (S10)) and executes step 42 (S42). 【0174】 In step 32 (S32), the distance measuring device 340 measures the distance between the observer 30 and the display device 11 and generates a measurement result (distance H3). The distance measuring device 340 also transmits a distance measurement signal containing the distance H3 data to the display panel distance changing device 350. 【0175】 In step 34 (S14), the inter-display panel distance changing device 350 changes the distance H1 between the first display panel 100 and the second display panel 200 to distance H4 in response to the distance measurement signal. Furthermore, the inter-display panel distance changing device 350 includes data for distance H4. The distance change signal is transmitted to the control signal transmission circuit 317 and the video signal distribution circuit 315. 【0176】 In step 36 (S36), the control signal transmission circuit 317 generates a synchronization signal based on the distance change signal. The control signal transmission circuit 317 transmits the video signal and the synchronization signal to the video signal distribution circuit 315. 【0177】 In step 38 (S38), the video signal distribution circuit 315, based on the distance change signal, the video signal, and the synchronization signal, distributes the video signal into a first video signal and a second video signal according to the resolution corresponding to the video signal, based on the measured distance (distance H4) between the first display panel and the second display panel 200, and generates a fifth control signal other than the synchronization signal. The video signal distribution circuit 315 also transmits the fifth control signal, including the first video signal, the second video signal, and the synchronization signal, to the second driver IC 206 and the first driver IC 106. 【0178】 In step 40 (S40), the control signal transmission circuit 317 generates a synchronization signal based on the input signal MODE3, which includes data for the normal display method (MODE3). The control signal transmission circuit 317 transmits the video signal and the synchronization signal to the video signal distribution circuit 315. 【0179】 In step 42 (S42), the video signal distribution circuit 315, based on the input signal MODE3, the video signal, and the synchronization signal, distributes the video signal into a first video signal and a second video signal according to the resolution corresponding to the video signal, based on the current distance (distance H1) between the first display panel and the second display panel 200, and generates a fifth control signal other than the synchronization signal. The video signal distribution circuit 315 also transmits the fifth control signal, including the first video signal, the second video signal, and the synchronization signal, to the second driver IC 206 and the first driver IC 106. 【0180】 In step 50 (S60), following steps 38 (S38) and 42 (S42), the first driver IC 106 and the second driver IC 206 control the first display panel 100 and the second display panel 200 based on the signals received by the first driver IC 106 and the second driver IC 206, and the first display panel 100 and the second display panel 200 display an image. 【0181】 As explained above, in the stereoscopic display method (MODE2), the first driver IC 106, the second driver IC 206, the first display panel 100, and the second display panel 200 can be controlled according to the resolution corresponding to the video signal, based on the measured distance (distance H4) between the first display panel and the second display panel 200. As a result, the first display panel 100 and the second display panel 200 can display a stereoscopic image corresponding to the measured distance (distance H4) between the first display panel and the second display panel 200. 【0182】 Furthermore, in the normal display method (MODE3), the first driver IC 106, the second driver IC 206, the first display panel 100, and the second display panel 200 can be controlled according to the resolution corresponding to the video signal, based on the current distance (distance H1) between the first display panel and the second display panel 200. As a result, the first display panel 100 and the second display panel 200 can display video adapted to the resolution corresponding to the current distance (distance H1) between the first display panel and the second display panel 200. 【0183】 <Third Embodiment> In the third embodiment, a configuration of the display device 12 different from that of the first embodiment will be described. Figure 22 is a schematic perspective view showing the configuration of the display device 12 according to the third embodiment of the present invention. In the description of the display device 12, explanations similar to those for the display device 10 may be omitted. 【0184】 Compared to the display device 10, the display device 12 does not include the insulating layer 240 and insulating layer 248, but includes a conductive adhesive 412 and a circular polarizing plate 414. The insulating layer 248 is replaced with the conductive adhesive 412 and the insulating layer 240 is replaced with the circular polarizing plate 414. Since the other configurations and functions of the display device 12 are the same as those of the display device 10, a description of the same configurations and functions as the display device 10 is omitted. 【0185】 A conductive adhesive 412 is placed on top of the array layer 230. A circular polarizing plate 414 is placed on top of the conductive adhesive 412 and bonded to the array layer 230. 【0186】 In the display device 12, the intrusion of ESD into the display device 12 can be suppressed by using a conductive adhesive 412. As a result, damage to the elements or wiring inside the display device 12 due to ESD can be suppressed. 【0187】 Furthermore, in the display device 12, the circular polarizer 414 is provided on the observer 30 side. As a result, excessive reflection toward the observer 30 can be suppressed. 【0188】 <Fourth Embodiment> In the fourth embodiment, a configuration of the display device 13 different from that of the first embodiment will be described. Figure 23 is a schematic perspective view showing the configuration of the display device 13 according to the fourth embodiment of the present invention. In the description of the display device 13, explanations similar to those for the display device 10 may be omitted. 【0189】 Compared to the display device 10, the display device 13 does not include the low-reflection heat dissipation layer 220, but includes an insulating layer 416. Since the other configurations and functions of the display device 13 are the same as those of the display device 10, a description of the same configurations and functions as the display device 10 is omitted. 【0190】 An insulating layer 416 is placed on the first surface 212 of the substrate 210. The insulating layer 416 is formed using a material with low reflectivity and high thermal conductivity. For example, the insulating layer 416 may be made of alumina (Al2O3). The insulating layer 416 may be on a substrate different from the substrate 210. For example, the insulating layer 416 may be an alumina (Al2O3) sheet, or it may be a component with a low reflectivity material on the surface of aluminum nitride (AlN). If the insulating layer 416 is on a substrate different from the substrate 210, the substrate may be bonded to the substrate 210 using an adhesive or the like. 【0191】 The display device 13 has a configuration that allows heat to dissipate (a heat-dissipating configuration) by using an insulating layer 416. As a result, the display device 13 can suppress the decrease in the luminous efficiency of each light-emitting element due to the heat generated when the first display panel 100 and the second display panel 200 are displayed. Furthermore, the display device 10 can increase the amount of current flowing to each light-emitting element compared to conventional devices, making it possible to set a higher brightness for the light-emitting elements. 【0192】 <Fifth Embodiment> In the fifth embodiment, a configuration of the display device 14 different from that of the first embodiment will be described. Figure 24 is a schematic perspective view showing the configuration of the display device 14 according to the fifth embodiment of the present invention. In the description of the display device 14, explanations similar to those for the display device 10 may be omitted. 【0193】 Compared to the display device 10, the display device 14 includes a high thermal conductivity substrate 500 between the first display panel 100 and the second display panel 200. Since the other configurations and functions of the display device 14 are the same as those of the display device 10, a description of the same configurations and functions as the display device 10 is omitted. 【0194】 The high thermal conductivity substrate 500 is placed between the insulating layer 140 and the low-reflection heat dissipation layer 220. The high thermal conductivity substrate 500 is also connected to the side wall 410 of the housing 400. The high thermal conductivity substrate 500 is formed using a material with low reflectivity and high thermal conductivity. For example, the high thermal conductivity substrate 500 may be a substrate formed using alumina (Al2O3), or it may be a substrate formed using aluminum nitride (AlN). 【0195】 The display device 13 has a configuration that allows heat to dissipate (a heat-dissipating configuration) by using a high thermal conductivity substrate 500. As a result, the display device 13 can suppress the decrease in the luminous efficiency of each light-emitting element that occurs due to the heat generated when the first display panel 100 and the second display panel 200 are displayed. Furthermore, the display device 10 can increase the amount of current flowing to each light-emitting element compared to conventional devices, making it possible to set a higher brightness for the light-emitting elements. 【0196】 The embodiments described above as embodiments of the present invention can be combined and implemented as appropriate, insofar as they do not contradict each other. Furthermore, devices based on the display devices of each embodiment, in which a person skilled in the art has added, deleted, or modified components, or added, omitted, or modified processes, are also included within the scope of the present invention, as long as they retain the essence of the present invention. 【0197】 Any effects or benefits other than those brought about by the embodiments described above, if they are clear from the description herein or easily predictable to a person skilled in the art, are naturally considered to be brought about by the present invention. [Explanation of Symbols] 【0198】 10: Display device, 11: Display device, 12: Display device, 13: Display device, 14: Display device, 30: Observer, 100: First display panel, 104: Display unit, 106: First driver IC, 108: Scanning signal line drive circuit, 110: Substrate, 111: Terminal unit, 112: First surface, 114: Second surface, 115: Terminal, 116: Peripheral part, 118: Terminal, 120: Low-reflection heat dissipation layer, 124: Wiring, 126: Wiring, 128a: Contact hole, 128b: Contact hole, 130: Array layer, 132: Wiring, 132a: Contact hole, 132b: Contact hole, 1 34: Contact hole, 136: Contact hole, 138: Contact hole, 140: Insulating layer, 141: Underlayer, 142: Insulating layer, 143: Insulating layer, 144: Insulating layer, 145: Insulating layer, 146: Insulating layer, 147: Insulating layer, 149: Aperture, 160B: Subpixel, 160G: Subpixel, 160R: Subpixel, 171: Semiconductor layer, 171a: Semiconductor film, 171b: Semiconductor film, 172: Contact hole, 184: Gate wiring layer, 184a: Scanning signal line, 184b: Scanning signal line, 184c: Scanning signal line, 184d: Gate gate, 186: First conductive layer, 18 6a: Video signal line, 186b: Video signal line, 186c: Video signal line, 186d: Video signal line, 186e: Video signal line, 186f: Video signal line, 186g: Source electrode, 186h: Drain electrode, 188: Second conductive layer, 188a: Electrode, 190: Third conductive layer, 190a: Electrode, 192: Fourth conductive layer, 192a: Electrode, 194: Fifth conductive layer, 194a: Junction electrode, 194b: Junction electrode, 196: Sixth conductive layer, 196a: Electrode, 200: Second display panel, 204: Display unit, 206: Second driver IC, 208: Scan signal line drive circuit, 209: Terminal unit, 210 :Substrate, 211:Opening, 212:First surface, 214:Second surface, 215:Terminal, 216:Peripheral area, 218:Terminal, 220:Low-reflection heat dissipation layer, 220a:Low-reflection heat dissipation layer, 220b:Low-reflection heat dissipation layer, 220c:Low-reflection heat dissipation layer, 220d:Low-reflection heat dissipation layer, 220e:Low-reflection heat dissipation layer, 220f:Low-reflection heat dissipation layer, 220g:Low-reflection heat dissipation layer, 220h:Low-reflection heat dissipation layer, 224:Wiring, 226:Wiring, 230:Array layer, 232a:Contact hole, 232b:Contact hole, 234:Contact hole, 236:Contact hole, 238:Contact hole,240: Insulating layer, 241: Underlayment layer, 242: Insulating layer, 243: Insulating layer, 244: Insulating layer, 245: Insulating layer, 246: Insulating layer, 247: Insulating layer, 249a: Aperture, 249b: Aperture, 260B: Subpixel, 260G: Subpixel, 260R: Subpixel, 271: Semiconductor layer, 271a: Semiconductor film, 271b: Semiconductor film, 272: Contact hole, 284: Gate wiring layer, 284a: Running Scan signal line, 284b: Scan signal line, 284c: Scan signal line, 284d: Token electrode, 286: First conductive layer, 286a: Video signal line, 286b: Video signal line, 286c: Video signal line, 286d: Video signal line, 286e: Video signal line, 286f: Video signal line, 286g: Source electrode, 286h: Drain electrode, 288: Second conductive layer, 288a: Electrode, 290: Third conductive layer, 290a: Electrode , 292: 4th conductive layer, 292a: electrode, 294: 5th conductive layer, 294a: electrode, 294b: electrode, 300: control device, 301: control device, 310: display panel control circuit, 312: video signal transmission circuit, 314: video signal distribution circuit, 315: video signal distribution circuit, 316: control signal transmission circuit, 317: control signal transmission circuit, 320: resolution comparison and determination circuit, 330: display selection circuit, 340: distance measuring device, 350: display panel distance changing device, 400: housing, 410: side wall, 412: conductive adhesive, 414: circular polarizer, 416: insulating layer, 417: slit, 417b: slit, 417c: slit, 500: high thermal conductivity substrate, BLED1: light-emitting element, BLED2: light-emitting element, GLED1: light-emitting element, GLED2: light-emitting element, RLED1: light-emitting element, RLED2: light-emitting element,

Claims

[Claim 1] A first substrate including a first surface and a second surface opposite to the first surface, wherein a first LED chip included in a first pixel, a first FPC, and first wiring connected to the first LED chip and the first FPC are arranged on the second surface, A second substrate including a third surface and a fourth surface opposite to the third surface, the fourth surface including a second LED chip included in a second pixel, a second FPC, and a second wiring connected to the second LED chip and the second FPC, A first heat dissipation layer, a second heat dissipation layer, and a third heat dissipation layer, Includes, The second surface faces the third surface, The second wiring is superimposed on the first wiring. In a plan view, the second LED chip and the first LED chip are arranged side by side. The first heat dissipation layer is arranged on the first surface side, The second heat dissipation layer includes a first opening superimposed on the first LED chip and is positioned on the second surface side. The third heat dissipation layer includes a second opening superimposed on the first LED chip and the first opening, and is positioned on the third surface side. Display device. [Claim 2] The first FPC is positioned at the end of the second surface side, The second FPC is positioned at the end of the fourth face side opposite to the first FPC, The display device according to claim 1. [Claim 3] The size of the first LED chip is larger than the size of the second LED chip. The display device according to claim 1. [Claim 4] The reflectance of the first heat dissipation layer, the second heat dissipation layer, and the third heat dissipation layer is 10% or less in the range of visible light wavelengths. The display device according to claim 1. [Claim 5] The third heat dissipation layer is superimposed on the first FPC and the second FPC. The length of the third heat dissipation layer in the first direction is longer than the length of the first heat dissipation layer in the first direction and the length of the second heat dissipation layer in the first direction. The display device according to claim 1. [Claim 6] The display device includes a housing, The aforementioned enclosure is Arranged to surround the first substrate and the second substrate, Connected to the first heat dissipation layer, the second heat dissipation layer, and the third heat dissipation layer, The display device according to claim 1. [Claim 7] The display device further includes a circular polarizing plate and a conductive film disposed on the circular polarizing plate. The circular polarizing plate is arranged on the fourth side, The conductive film is disposed between the circular polarizer and the fourth surface. The display device according to claim 4. [Claim 8] The display device further includes a fourth heat dissipation layer, The fourth heat dissipation layer includes a third opening superimposed on the second LED chip, and a fourth opening superimposed on the first LED chip, the first opening, and the second opening, and is positioned on the fourth surface side and connected to the housing. The reflectance of the fourth heat dissipation layer is 10% or less in the wavelength range of the visible light region. The display device according to claim 6. [Claim 9] The size of the first opening and the size of the second opening are larger than the size of the fourth opening. The display device according to claim 8. [Claim 10] The third heat dissipation layer is arranged to overlap the entire surface of the third surface, except for the second opening. The display device according to claim 6. [Claim 11] The third heat dissipation layer includes, in a plan view, a plurality of first grooves parallel to the first direction, The display device according to claim 6. [Claim 12] The third heat dissipation layer includes, in a plan view, a plurality of second grooves parallel to the second direction intersecting the first direction, The display device according to claim 6. [Claim 13] The third heat dissipation layer includes, in a plan view, a plurality of third grooves parallel to a direction that intersects both a first direction and a second direction intersecting the first direction. The display device according to claim 6. [Claim 14] The display device includes a third substrate, The third substrate is positioned between the second heat dissipation layer and the third heat dissipation layer, and is in contact with the second heat dissipation layer and the third heat dissipation layer. The display device according to claim 6. [Claim 15] The display device includes a first drive circuit for driving the first LED chip, a second drive circuit for driving the second LED chip, and a control device that controls the first drive circuit and the second drive circuit and supplies different video signals to the first wiring and the second wiring, respectively. The display device according to claim 8. [Claim 16] The display device further includes a distance measuring device capable of measuring the distance between a user who can see the display device and the display device, and a distance changing device capable of adjusting the length between the first substrate and the second substrate according to the distance measured by the distance measuring device. The display device according to claim 15. [Claim 17] The display device further includes a third LED chip, a fourth LED chip, a fifth LED chip, a sixth LED chip, a third wiring connected to the third LED chip and the first FPC, a fourth wiring connected to the fourth LED chip and the first FPC, a fifth wiring connected to the fifth LED chip and the second FPC, and a sixth wiring connected to the sixth LED chip and the second FPC. The third LED chip, the fourth LED chip, the third wiring, and the fourth wiring are arranged on the second surface. The fifth LED chip, the sixth LED chip, the fifth wiring, and the sixth wiring are arranged on the fourth surface. The first pixel includes the first LED chip, the third LED chip, and the fourth LED chip. The second pixel includes the second LED chip, the fifth LED chip, and the sixth LED chip. The display device according to claim 1. [Claim 18] The arrangement of the first LED chip, the third LED chip, and the fourth LED chip, and the arrangement of the second LED chip, the fifth LED chip, and the sixth LED chip, are a stripe arrangement, a mosaic arrangement, or a delta arrangement. The display device according to claim 17. [Claim 19] The display device includes a plurality of first pixels and a plurality of second pixels, The plurality of first pixels are arranged in a first direction and a second direction intersecting the first direction. The plurality of second pixels are arranged in the first direction and the second direction. The pitch of the plurality of first pixels is the same as the pitch of the plurality of second pixels. The display device according to claim 17.

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