Display device

Abstract

A display device is provided. The display device includes: a substrate including a first region and a second region, the first region including a display region and a non-display region outside the display region; a first layer including a plurality of pixels configured to display an image and disposed in the display region; pads disposed on the substrate in the second region, signals being provided to the pads to display an image; a first conductive member disposed in the second region and electrically connected to the pads; a second layer including a plurality of touch electrodes configured to be provided with a touch input and located in the display region; and a second conductive member located in the second region and electrically connected to the touch electrodes and the first conductive member. The first layer and the second layer are separated by a first length, and the first conductive member and the second conductive member are separated by a second length. The first length and the second length are different from each other.

Description

[0001] This application is a divisional application of the patent application for invention No. 201710511330.0, titled "Flat Panel Display Device Including a Touch Screen and Method of Manufacturing the Same", filed with the State Intellectual Property Office on June 27, 2017. This application claims the priority and benefit of Korean Patent Application No. 10-2016-0081094, filed on June 28, 2016, the entire content of which is incorporated herein by reference in its entirety. Technical Field

[0002] Embodiments of the inventive concept relate to a flat panel display device, and more particularly, to a flat panel display device including a touch screen and a method of manufacturing the same. Background Art

[0003] Recently, touch screen panels are being used in liquid crystal displays (LCDs) or organic light emitting display devices (OLEDs). As a device for inputting commands by contact with an object such as a user's finger or a pen, the touch screen panel identifies a contact position by sensing a change in capacitance or voltage between two electrodes and provides a user's command to the display device according to the contact position.

[0004] To apply a touch screen panel to a display device, touch screen integrated display devices such as an in-cell display device are being developed.

[0005] The touch screen includes: a plurality of first sensing electrodes arranged in one direction; a plurality of second sensing electrodes arranged in a direction crossing the one direction and electrically insulated from the plurality of first sensing electrodes; a plurality of wires connected to the plurality of first sensing electrodes and the plurality of second sensing electrodes; and pads for providing a signal input from the outside to the first sensing electrodes and the second sensing electrodes through the wires and outputting a signal sensed by the first sensing electrodes and the second sensing electrodes to the outside.

[0006] Accordingly, when implementing a touch screen in a display device, the design and manufacturing processes become complicated. Summary of the Invention

[0007] Embodiments of the inventive concept relate to a flat panel display device including a touch screen that can easily miniaturize a high-resolution display device.

[0008] Embodiments of the inventive concept relate to a method of manufacturing a flat panel display device including a touch screen, the method being capable of easily manufacturing a flexible and transparent film substrate.

[0009] Embodiments of the inventive concept relate to a method of manufacturing a flat panel display device including a touch screen, the method being capable of reducing the size of conductive balls and reducing manufacturing costs.

[0010] A flat panel display device including a touch screen according to an embodiment of the inventive concept includes: a first film substrate including a first plane and a second plane higher than the first plane; pixels disposed on the first plane of the first film substrate and configured to display an image; a first pad disposed on the second plane of the first film substrate, to which a signal is input from the outside of the flat panel display device to display an image; a second pad disposed on the second plane of the first film substrate and connected to the first pad; a second film substrate arranged to face the first film substrate; a touch sensor disposed on the second film substrate in a region corresponding to the pixels; a third pad disposed on the second film substrate in a region corresponding to the second pad and connected to the touch sensor; and a plurality of conductive balls configured to electrically connect the second pad and the third pad.

[0011] The first film substrate includes: a first insulating layer stacked with the first plane and the second plane; and a second insulating layer selectively disposed on the first insulating layer in a region corresponding to the second plane.

[0012] The first plane includes a display region including pixels and a non-display region surrounding the display region.

[0013] The flat panel display device further includes at least one driving circuit disposed in the non-display region of the first plane and configured to drive the pixels according to a signal input from the outside through the first pad.

[0014] The pixels include organic light emitting diodes (OLEDs).

[0015] The touch sensor includes: a plurality of first sensing electrodes arranged in a first direction; and a plurality of second sensing electrodes arranged in a second direction intersecting the first direction.

[0016] The third pad is connected to the plurality of first sensing electrodes and the plurality of second sensing electrodes, respectively.

[0017] The second pad is disposed in a region corresponding to the third pad.

[0018] The second film substrate includes: a third plane disposed in a region corresponding to the first plane; and a fourth plane disposed in a region corresponding to the second plane and higher than the third plane. The touch sensor is disposed on the third plane, and the third pad is disposed on the fourth plane.

[0019] The second film substrate includes: a third insulating layer stacked with the third plane and the fourth plane; and a fourth insulating layer selectively formed on the third insulating layer of the fourth plane.

[0020] The plurality of conductive balls have a diameter of 5 μm to 15 μm.

[0021] The flat panel display device further includes a transparent adhesive layer disposed between the first film substrate and the second film substrate.

[0022] A method of manufacturing a flat panel display device including a touch screen according to another embodiment of the inventive concept includes: forming a first film substrate including a first plane and a second plane higher than the first plane on a first support substrate; forming pixels configured to display an image on the first plane of the first film substrate; forming a first pad and a second pad connected to the first pad on the second plane of the first film substrate, and signals are input from the outside of the flat panel display device to the first pad to display an image; forming a second film substrate on a second support substrate; forming a touch sensor and a third pad connected to the touch sensor on the second film substrate; attaching the first film substrate to the second film substrate such that the second pad and the third pad are electrically connected through the plurality of conductive balls; and separating the first support substrate from the first film substrate and separating the second support substrate from the second film substrate.

[0023] The step of forming the first film substrate includes: forming an insulating layer on the first support substrate; and removing a predetermined thickness of the insulating layer in a region corresponding to the first plane.

[0024] The step of forming the first film substrate includes: sequentially forming a first insulating layer and a second insulating layer on the first support substrate to overlap with the first plane and the second plane; and removing the second insulating layer in a region corresponding to the first plane.

[0025] The step of forming the second film substrate includes: forming an insulating layer on the second support substrate; and removing a predetermined thickness of the insulating layer in a region corresponding to the third plane.

[0026] Form a touch sensor on the third plane of the second film substrate and form a third pad on the fourth plane of the second film substrate.

[0027] The step of forming the second film substrate includes: sequentially forming a third insulating layer and a fourth insulating layer on the second support substrate to overlap with the third plane and the fourth plane; and removing the fourth insulating layer in a region corresponding to the third plane.

[0028] Form a touch sensor on the third plane of the second film substrate and form a third pad on the fourth plane of the second film substrate.

[0029] Adhere the first film substrate and the second film substrate to each other and place a transparent adhesive layer between the first film substrate and the second film substrate.

[0030] Place the conductive balls in the transparent adhesive layer.

[0031] The plurality of conductive balls have a diameter of 5 μm to 15 μm.

[0032] A flexible and transparent material with a small thickness is coated on a support substrate to easily form a film substrate. A step difference is formed in the film substrate to reduce the distance between the pads of two film substrates. Since conductive balls with a reduced diameter are used to electrically connect the pads, the distance between the pads is reduced to enable easy miniaturization of a high-resolution flat panel display device, prevent electrical connection defects between the pads, and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example to those skilled in the art.

[0034] In the drawings, the dimensions may be exaggerated for clarity. It will be understood that when an element is referred to as being “between” two elements, the element may be the only element between the two elements or there may also be one or more intervening elements. The same reference numerals always denote the same elements.

[0035] Figure 1A and Figure 1B is a cross-sectional view of a flat panel display device including a touch screen according to an embodiment of the inventive concept;

[0036] Figure 2 is a plan view of a first film substrate according to an embodiment of the inventive concept;

[0037] Figure 3 is a plan view of a second film substrate according to an embodiment of the inventive concept;

[0038] Figure 4 is a cross-sectional view of a flat panel display device including a touch screen according to another embodiment of the inventive concept;

[0039] Figure 5 is a plan view of a second film substrate according to an embodiment of the inventive concept;

[0040] Figure 6A 、 Figure 6B 、 Figure 6C 、 Figure 6D and Figure 6E are cross-sectional views of a method of manufacturing a flat panel display device including a touch screen according to an embodiment of the inventive concept;

[0041] Figure 7A 、 Figure 7B 、 Figure 7C 、 Figure 7D and Figure 7EIt is a cross-sectional view showing a method of manufacturing a flat panel display device including a touch screen according to another embodiment of the inventive concept. Detailed Description

[0042] Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example to those skilled in the art.

[0043] Figure 1A is a cross-sectional view showing a flat panel display device including a touch screen according to an embodiment of the inventive concept to be described with reference to Figure 2 and Figure 3

[0044] Referring to Figure 1A , the flat panel display device includes a first film substrate 100 having a step difference (height difference) formed on its surface, a second film substrate 250 having a flat surface, and a transparent adhesive layer 300 and conductive balls 450 disposed between the first film substrate 100 and the second film substrate 250.

[0045] Referring to Figure 2 , the first film substrate 100 includes a first plane 110 and a second plane 120 that is higher than the first plane 110. The surface of the first film substrate 100 has a step difference due to the height difference between the first plane 110 and the second plane 120.

[0046] The first plane 110 of the first film substrate 100 includes a display area 110a for displaying an image and a non-display area 110b surrounding the display area 110a.

[0047] Pixels 10 for displaying an image are disposed in the display area 110a of the first plane 110, and at least one driving circuit 20 and 30 for driving the pixels 10 may be disposed in the non-display area 110b of the first plane 110.

[0048] The pixels 10 may include, for example, a plurality of organic light emitting diodes (OLEDs) and thin film transistors (TFTs) and capacitors connected to the OLEDs, and the plurality of organic light emitting diodes are disposed in a matrix configuration between a plurality of scan lines and a plurality of data lines.

[0049] For example, the driving circuit 20 as a scan driver may be connected to a plurality of scan lines (not shown). The scan driver may include a driving circuit 20 disposed on one side of the pixels 10 and connected to odd-numbered scan lines and a driving circuit 20 disposed on the other side of the pixels 10 and connected to even-numbered scan lines.

[0050] ​For example, a driving circuit 30 serving as a data driver may be connected to a plurality of data lines (not shown). The driving circuit 30 may be disposed on the other side of the pixel 10.

[0051] A first pad 40 and a second pad 50 connected to the first pad 40 are provided on a second plane 120 of a first film substrate 100, and signals are input from the outside to the first pad 40 to display an image.

[0052] The first pad 40 includes a plurality of pads, some of which are connected to the driving circuits 20 and 30 through wires 42, and the other pads are connected to the pads in the second pad 50 through wires 42.

[0053] In Figure 2 it is shown that the second pad 50 is divided into a first second pad 50a and a second second pad 50b. However, the first second pad 50a and the second second pad 50b may be integrated into one pad or may be divided into a plurality of pads.

[0054] Referring to Figure 3 , a second film substrate 250 includes a display area 210a corresponding to a display area 110a of the first film substrate 100 and a non-display area 210b surrounding the display area 210a. A touch sensor 60 is disposed in the display area 210a, and a third pad 70 connected to the touch sensor 60 through a wire 74 is disposed in the non-display area 210b. The third pad 70 is disposed at a position corresponding to the second pad 50 of the first film substrate 100.

[0055] The touch sensor 60 includes a plurality of first sensing electrodes 62 arranged in a first direction (e.g., the X-axis direction) and a plurality of second sensing electrodes 64 arranged in a second direction (e.g., the Y-axis direction) intersecting the first direction. The plurality of first sensing electrodes 62 and the plurality of second sensing electrodes 64 are electrically insulated from each other.

[0056] The third pad 70 includes a plurality of pads. Some of the pads are connected to the plurality of first sensing electrodes 62 through wires 74, and the other pads are connected to the plurality of second sensing electrodes 64 through wires 74. In Figure 3 it is shown that a first third pad 70a including pads connected to the plurality of first sensing electrodes 62 and a second third pad 70b including pads connected to the plurality of second sensing electrodes 64. However, the first third pad 70a and the second third pad 70b may be integrated into one pad or may be divided into a plurality of pads.

[0057] Referring to Figure 1A, the first film substrate 100 and the second film substrate 250 are adhered to each other through a transparent adhesive layer 300 disposed between the first film substrate 100 and the second film substrate 250, such that the pixel 10 and the touch sensor 60 face each other. At this time, a plurality of conductive balls 450 are disposed between the second pad 50 and the third pad 70, such that the touch sensor 60 can be electrically connected to the first pad 40 through the third pad 70 and the second pad 50.

[0058] To display an image, the first pad 40 includes not only pads for inputting signals from the outside, but also pads for providing signals input from the outside to the first sensing electrode 62 and the second sensing electrode 64 through the second pad 50 and the third pad 70 or for outputting signals sensed by the first sensing electrode 62 and the second sensing electrode 64 to the outside.

[0059] In Figure 1A , it is shown that the surface of the first film substrate 100 has a step difference, and the surface of the second film substrate 250 is flat. On the contrary, as shown in Figure 1B , the surface of the first film substrate 100 may be flat, and the surface of the second film substrate 250 may have a step difference.

[0060] Figure 4 is a cross-sectional view of a flat panel display device including a touch screen according to another embodiment of the inventive concept to be described with reference to Figure 2 and Figure 5 .

[0061] Referring to Figure 4 , the flat panel display device includes a first film substrate 100 and a second film substrate 200 having a step difference formed on the surface thereof, and a transparent adhesive layer 300 and conductive balls 400 disposed between the first film substrate 100 and the second film substrate 200.

[0062] Referring to Figure 2 , the first film substrate 100 includes a first plane 110 and a second plane 120 that is higher than the first plane 110. The surface of the first film substrate 100 has a step difference due to the height difference between the first plane 110 and the second plane 120.

[0063] The first plane 110 of the first film substrate 100 includes a display area 110a for displaying an image and a non-display area 110b surrounding the display area 110a.

[0064] Pixels 10 for displaying an image are disposed in the display area 110a of the first plane 110, and at least one driving circuit 20 and 30 for driving the pixels 10 may be disposed in the non-display area 110b of the first plane 110.

[0065] The pixel 10 may include, for example, a plurality of organic light-emitting diodes (OLEDs), a thin-film transistor (TFT) connected to the OLEDs, and a capacitor. The plurality of organic light-emitting diodes are arranged in a matrix structure between a plurality of scan lines and a plurality of data lines.

[0066] For example, the driving circuit 20 serving as a scan driver may be connected to a plurality of scan lines (not shown). The scan driver may include a driving circuit 20 arranged at one side of the pixel 10 and connected to odd-numbered scan lines, and a driving circuit 20 arranged at the other side of the pixel 10 and connected to even-numbered scan lines.

[0067] For example, the driving circuit 30 serving as a data driver may be connected to a plurality of data lines (not shown). The driving circuit 30 may be arranged at the other side of the pixel 10.

[0068] The first pad 40 and the second pad 50 connected to the first pad 40 are provided on the second plane 120 of the first film substrate 100. Signals are input from the outside to the first pad 40 to display an image.

[0069] The first pad 40 includes a plurality of pads. Some pads are connected to the driving circuits 20 and 30 through wires 42, and other pads are connected to the pads of the second pad 50 through wires 42.

[0070] In Figure 2 it is shown that the second pad 50 is divided into a first second pad 50a and a second second pad 50b. However, the first second pad 50a and the second second pad 50b may be integrated into one pad or may be divided into a plurality of pads.

[0071] Referring to Figure 4 , the second film substrate 200 includes a third plane 210 and a fourth plane 220 higher than the third plane 210. The surface of the second film substrate 200 has a step difference due to the height difference between the third plane 210 and the fourth plane 220.

[0072] The third plane 210 and the fourth plane 220 of the second film substrate 200 are respectively formed in regions corresponding to the first plane 110 and the second plane 120 of the first film substrate 100.

[0073] The touch sensor 60 is provided on the third plane 210 of the second film substrate 200, and the third pad 70 connected to the touch sensor 60 is provided on the fourth plane 220.

[0074] Referring to Figure 5, the third plane 210 of the second film substrate 200 includes a display area 210a and a non-display area 210b formed in areas corresponding to the display area 110a and the non-display area 110b of the first plane 110, respectively. The touch sensor 60 is disposed in the display area 210a, and a plurality of wires 74 for connecting the touch sensor 60 to the third pad 70 may be disposed in the non-display area 210b.

[0075] The touch sensor 60 includes a plurality of first sensing electrodes 62 arranged in a first direction (e.g., the X-axis direction) and a plurality of second sensing electrodes 64 arranged in a second direction (e.g., the Y-axis direction) intersecting the first direction. The plurality of first sensing electrodes 62 and the plurality of second sensing electrodes 64 are electrically insulated from each other.

[0076] The third pad 70 includes a plurality of pads. Some pads are connected to the plurality of first sensing electrodes 62 through the wires 74, and other pads are connected to the plurality of second sensing electrodes 64 through the wires 74. In Figure 5 , a first third pad 70a including pads connected to the plurality of first sensing electrodes 62 and a second third pad 70b including pads connected to the plurality of second sensing electrodes 64 are shown. However, the first third pad 70a and the second third pad 70b may be integrated into one pad or the third pad 70 may be divided into a plurality of pads.

[0077] Referring to Figure 4 , the first film substrate 100 and the second film substrate 200 are bonded to each other through a transparent adhesive layer 300 disposed between the first film substrate 100 and the second film substrate 200, such that the pixel 10 and the touch sensor 60 face each other. At this time, a plurality of conductive balls 400 are disposed between the second pad 50 and the third pad 70, such that the touch sensor 60 can be electrically connected to the first pad 40 through the third pad 70 and the second pad 50.

[0078] For displaying an image, the first pad 40 includes not only pads for inputting signals from the outside, but also pads for providing the signals input from the outside to the first sensing electrodes 62 and the second sensing electrodes 64 through the second pad 50 and the third pad 70 or for outputting the signals sensed by the first sensing electrodes 62 and the second sensing electrodes 64 to the outside.

[0079] In Figure 1A the flat panel display device shown, the surface of the first film substrate 100 has a step difference and the surface of the second film substrate 250 is flat. On the other hand, in Figure 4 the flat panel display device shown, both the surface of the first film substrate 100 and the surface of the second film substrate 200 have a step difference.

[0080] In addition, in Figure 4In the flat panel display device shown, the diameter of the conductive ball 400 is smaller than Figure 1A the diameter of the conductive ball 450 in the flat panel display device shown.

[0081] When assuming that the surfaces of the first film substrate 100 and the second film substrate 250 are both flat, the distance between the second pad 50 of the first film substrate 100 and the third pad 70 of the second film substrate 250 is about 20 μm. The distance between the second pad 50 and the third pad 70 is reduced due to the step difference on the surface of the first film substrate 100, and can be about 15 μm in the Figure 1A flat panel display device shown. The distance between the second pad 50 and the third pad 70 is reduced due to the step difference on the surface of the first film substrate 100 and the step difference on the surface of the second film substrate 200, and can be about 10 μm in the Figure 4 flat panel display device shown.

[0082] As described above, when a step difference is formed on the surface of the first film substrate 100 and / or the surfaces of the second film substrates 200 and 250, the diameters of the conductive balls 400 and 450 can also be reduced because the distance between the second pad 50 and the third pad 70 can be reduced. The reduction in the diameters of the conductive balls 400 and 450 can depend on the step difference formed on the surface of the first film substrate 100 and / or the surfaces of the second film substrates 200 and 250, and can be about 5 μm to 15 μm, which can solve the following problems.

[0083] First, in the second pad 50 and the third pad 70, the distance between the pads can be determined in proportion to the diameters of the conductive balls 400 and 450. When the diameters of the conductive balls 400 and 450 increase, there is a limitation on reducing the areas of the second pad 50 and the third pad 70 because the distance between the pads must also increase. On the other hand, according to an embodiment of the inventive concept, it is possible to reduce the distance between the pads by using the conductive balls 400 and 450 having a small diameter, and it is possible to easily implement a high-resolution flat panel display device.

[0084] Second, when the large-diameter conductive balls 400 are included in the transparent adhesive layer 300, it is difficult to coat the transparent adhesive layer 300 with a uniform thickness. When the thickness uniformity of the transparent adhesive layer 300 deteriorates, the dispersion of the conductive balls 400 is non-uniform, which can cause electrical connection defects between the pads. On the other hand, according to an embodiment of the inventive concept, the conductive balls 400 having a small diameter are used, so that the transparent adhesive layer 300 can be coated with a uniform thickness. As a result, the dispersion of the conductive balls 400 becomes uniform, and electrical connection defects between the pads can be prevented.

[0085] Third, according to an embodiment of the inventive concept, using conductive balls 400 and 450 having a small diameter enables reduction of manufacturing costs.

[0086] A method of manufacturing a flat panel display device including a touch screen according to an embodiment of the inventive concept will be described in detail.

[0087] Figures 6A to 6E is a cross-sectional view showing a method of manufacturing a flat panel display device including a touch screen according to an embodiment of the inventive concept to be described with reference to Figure 2 and Figure 3 A cross-sectional view showing a method of manufacturing a flat panel display device including a touch screen according to an embodiment of the inventive concept to be described with reference to

[0088] Referring to Figure 6A a first film substrate 100 including a first plane 110 and a second plane 120 higher than the first plane 110 is formed on a first support substrate 500.

[0089] The first film substrate 100 may be formed by forming an insulating layer on the first support substrate 500 and removing an insulating layer having a predetermined thickness in a region corresponding to the first plane 110, or by sequentially forming a first insulating layer 100a and a second insulating layer 100b on the first support substrate 500 in the first plane 110 and the second plane 120 and removing the second insulating layer 100b in a region corresponding to the first plane 110.

[0090] To form the first plane 110, a photolithography process and an etching process using a mask may be performed. A step difference between the first plane 110 and the second plane 120 adjacent to each other may be formed obliquely.

[0091] The first film substrate 100, which is a transparent and flexible organic material, may be formed of, for example, polydimethylsiloxane (PDMS), polyimide, polycarbonate (PC), polybenzimidazole, polystyrene (PS), polyurethane, polyaniline, polyvinyl alcohol (PVA), polyethylene glycol (PEG), polyvinyl chloride (PVC), polyethylene, polyethylene terephthalate, or polyethylene naphthalate.

[0092] When a photosensitive organic material is used, the first plane 110 may be easily formed through an exposure and development process using a mask.

[0093] Referring to Figure 6B pixels 10 for displaying an image are formed on the first plane 110 of the first film substrate 100, and a first pad 40 and a second pad 50 connected to the first pad 40 are formed on the second plane 120, and signals are input from the outside to the first pad 40 to display an image.

[0094] Referring to Figure 2, the first plane 110 of the first film substrate 100 may include a display area 110a for displaying an image and a non-display area 110b surrounding the display area 110a.

[0095] Pixels 10 for displaying an image are disposed in the display area 110a of the first plane 110, and at least one driving circuit 20 and 30 for driving the pixels 10 may be disposed in the non-display area 110b of the first plane 110.

[0096] For example, the pixel 10 may include a plurality of OLEDs disposed in a matrix structure between a plurality of scan lines and a plurality of data lines, and a TFT and a capacitor connected to the OLED.

[0097] For example, the driving circuit 20 as a scan driver may be connected to a plurality of scan lines (not shown). For example, the driving circuit 30 as a data driver may be connected to a plurality of data lines (not shown).

[0098] The driving circuits 20 and 30 are connected to the first pad 40 through a wire 42, and the first pad 40 is connected to the second pad 50 through a wire 42.

[0099] Refer to Figure 6C , a second film substrate 250 is formed on the second support substrate 600.

[0100] The second film substrate 250, which is a transparent and flexible organic material, may be formed of the same material as the first film substrate 100.

[0101] Refer to Figure 6D , a touch sensor 60 and a third pad 70 connected to the touch sensor 60 are formed on the second film substrate 250. In a plan view, the third pad 70 is formed at a position corresponding to the second pad 50 of the first film substrate 100.

[0102] Refer to Figure 3 , the touch sensor 60 includes a plurality of first sensing electrodes 62 arranged in a first direction (e.g., the X-axis direction) and a plurality of second sensing electrodes 64 arranged in a second direction (e.g., the Y-axis direction) intersecting the first direction.

[0103] The third pad 70 includes a plurality of pads. Some pads are connected to the plurality of first sensing electrodes 62 through wires 74, and other pads are connected to the plurality of second sensing electrodes 64 through wires 74.

[0104] Refer to Figure 6E, the first film substrate 100 and the second film substrate 250 are arranged such that the pixel 10 and the touch sensor 60 face each other, and the first film substrate 100 and the second film substrate 250 are bonded to each other with the transparent adhesive layer 300 disposed therebetween. Meanwhile, a plurality of conductive balls 450 are disposed between the second pad 50 and the third pad 70 such that the second pad 50 and the third pad 70 are electrically connected through the conductive balls 450.

[0105] Depending on the material of the transparent adhesive layer 300, hardening may be performed after compressing the first film substrate 100 and the second film substrate 250.

[0106] For example, by coating the transparent adhesive layer 300 on the front surface of the first film substrate 100 or the second film substrate 250, a plurality of conductive balls 450 may be included in the transparent adhesive layer 300 at positions corresponding to the second pad 50 or the third pad 70.

[0107] Then, the first support substrate 500 is separated from the first film substrate 100, and the second support substrate 600 is separated from the second film substrate 250.

[0108] Figures 7A to 7E is a cross-sectional view showing a method of manufacturing a flat panel display device including a touch screen according to another embodiment of the inventive concept to be described with reference to Figure 2 and Figure 5 A cross-sectional view of a flat panel display device including a touch screen according to another embodiment of the inventive concept to be described.

[0109] Referring to Figure 7A , a first film substrate 100 including a first plane 110 and a second plane 120 higher than the first plane 110 is formed on the first support substrate 500.

[0110] The first film substrate 100 may be formed by forming an insulating layer on the first support substrate 500 and removing the insulating layer in a region corresponding to the first plane 110 by a predetermined thickness, or by sequentially forming a first insulating layer 100a and a second insulating layer 100b on the first support substrate 500 in the first plane 110 and the second plane 120 and removing the second insulating layer 100b in a region corresponding to the first plane 110.

[0111] To form the first plane 110, a photolithography process and an etching process using a mask may be performed. The step difference between the first plane 110 and the second plane 120 adjacent to each other may be formed obliquely.

[0112] The first film substrate 100, which is a transparent and flexible organic material, can be formed of, for example, polydimethylsiloxane (PDMS), polyimide, polycarbonate (PC), polybenzimidazole, polystyrene (PS), polyurethane, polyaniline, polyvinyl alcohol (PVA), polyethylene glycol (PEG), polyvinyl chloride (PVC), polyethylene, polyethylene terephthalate, or polyethylene naphthalate.

[0113] When a photosensitive organic material is used, the first plane 110 can be easily formed by an exposure and development process using a mask.

[0114] Referring Figure 7B , pixels 10 for displaying an image are formed on the first plane 110 of the first film substrate 100, a first pad 40 and a second pad 50 connected to the first pad 40 are formed on the second plane 120, and a signal is input from the outside to the first pad 40 to display an image.

[0115] Referring Figure 2 , the first plane 110 of the first film substrate 100 may include a display area 110a for displaying an image and a non-display area 110b surrounding the display area 110a.

[0116] Pixels 10 for displaying an image are provided in the display area 110a of the first plane 110, and at least one driving circuit 20 and 30 for driving the pixels 10 may be provided in the non-display area 110b of the first plane 110.

[0117] For example, the pixels 10 may include a plurality of OLEDs arranged in a matrix structure between a plurality of scan lines and a plurality of data lines, and a TFT and a capacitor connected to the OLEDs.

[0118] For example, the driving circuit 20 as a scan driver may be connected to a plurality of scan lines (not shown). For example, the driving circuit 30 as a data driver may be connected to a plurality of data lines (not shown).

[0119] The driving circuits 20 and 30 are connected to the first pad 40 through a wire 42, and the first pad 40 is connected to the second pad 50 through a wire 42.

[0120] Referring Figure 7C , a second film substrate 200 including a third plane 210 and a fourth plane 220 higher than the third plane 210 is formed on the second support substrate 600. In a plan view, the fourth plane 220 and the second plane 120 may overlap each other.

[0121] The third plane 210 and the fourth plane 220 of the second film substrate 200 are respectively formed in regions corresponding to the first plane 110 and the second plane 120 of the first film substrate 100.

[0122] The second film substrate 200 can be formed by forming an insulating layer on the second support substrate 600 and removing the insulating layer in the region corresponding to the third plane 210 with a predetermined thickness, or by sequentially forming a third insulating layer 200a and a fourth insulating layer 200b on the second support substrate 600 in the third plane 210 and the fourth plane 220 and removing the fourth insulating layer 200b in the region corresponding to the third plane 210.

[0123] To form the third plane 210, a photolithography process and an etching process using a mask can be performed. The step difference between the third plane 210 and the fourth plane 220 adjacent to each other can be formed obliquely.

[0124] The second film substrate 200, which is a transparent and flexible organic material, can be formed of the same material as the first film substrate 100.

[0125] Referring to Figure 7D , a touch sensor 60 is formed on the third plane 210 of the second film substrate 200 and a third pad 70 connected to the touch sensor 60 through a wire 74 is formed on the fourth plane 220. In a plan view, the third pad 70 is formed in a region corresponding to the second pad 50 of the first film substrate 100.

[0126] Referring to Figure 5 , the touch sensor 60 includes a plurality of first sensing electrodes 62 arranged in a first direction (e.g., the X-axis direction) and a plurality of second sensing electrodes 64 arranged in a second direction (e.g., the Y-axis direction) intersecting the first direction.

[0127] The third pad 70 includes a plurality of pads. Some pads are connected to the plurality of first sensing electrodes 62 through wires 74, and other pads are connected to the plurality of second sensing electrodes 64 through wires 74.

[0128] Referring to Figure 7E , the first film substrate 100 and the second film substrate 200 are arranged such that the pixel 10 and the touch sensor 60 face each other, and the first film substrate 100 and the second film substrate 200 are bonded to each other with the transparent adhesive layer 300 disposed between the first film substrate 100 and the second film substrate 200. At the same time, a plurality of conductive balls 400 are disposed between the second pad 50 and the third pad 70 such that the second pad 50 and the third pad 70 are electrically connected through the conductive balls 400.

[0129] Depending on the material of the transparent adhesive layer 300, hardening can be performed after compression of the first film substrate 100 and the second film substrate 200.

[0130] For example, by coating a transparent adhesive layer 300 on the front surface of the first film substrate 100 or the second film substrate 200, a plurality of conductive balls 400 can be included in the transparent adhesive layer 300 in a region corresponding to the second pad 50 or the third pad 70.

[0131] Then, the first support substrate 500 is separated from the first film substrate 100, and the second support substrate 600 is separated from the second film substrate 200.

[0132] Example embodiments have been disclosed herein. Although specific terms are employed, they are used and interpreted in a general and descriptive sense only and not for purposes of limitation. In some instances, as will be apparent to those of ordinary skill in the art, features, characteristics, and / or elements described in connection with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly stated, since the filing of the present application. Accordingly, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the spirit and scope of the inventive concept set forth in the claims.

Claims

1. A display device, the display device comprises: a substrate including a first region and a second region, the first region including a display region and a non-display region, the non-display region being outside the display region; a first layer including a plurality of pixels configured to display an image, at least a part of the first layer being disposed in the display region; a first pad disposed on the substrate in the second region, and signals being provided to the first pad to display the image; a second pad disposed in the second region and electrically connected to the first pad; a second layer including a plurality of touch electrodes configured to provide a touch input, at least a part of the second layer being located in the display region and spaced apart from the first layer in a thickness direction of the substrate such that the second layer faces the first layer; and a third pad located in the second region and electrically connected to the plurality of touch electrodes and the second pad; wherein the first layer and the second layer are separated by a first length, and the second pad and the third pad are separated by a second length, and wherein the first length is greater than the second length.

2. The display device according to claim 1, wherein the thickness of the substrate in the second region is thicker than the thickness of the substrate in the first region.

3. The display device according to claim 1, wherein the substrate includes: a first insulating layer stacked with the first region and the second region; and a second insulating layer selectively disposed on the first insulating layer in a region corresponding to the second region.

4. The display device according to claim 1, wherein the second region includes the non-display region.

5. The display device according to claim 1, the display device further comprises: at least one driving circuit disposed in the non-display region of the first region and configured to drive the plurality of pixels according to the signals input from the outside via the first pad.

6. The display device according to claim 1, wherein the plurality of pixels include organic light-emitting diodes.

7. The display device according to claim 1, wherein the plurality of touch electrodes include: a plurality of first sensing electrodes arranged in a first direction; and a plurality of second sensing electrodes arranged in a second direction intersecting the first direction.

8. The display device according to claim 7, wherein the third pad is respectively connected to the plurality of first sensing electrodes and the plurality of second sensing electrodes.

9. The display device according to claim 8, wherein the second pad is disposed in a region corresponding to the third pad.

10. The display device according to claim 1, the display device further comprises: an outer substrate arranged to face the substrate, wherein the second layer is disposed on the outer substrate in a region corresponding to the display region of the substrate.

11. The display device according to claim 10, wherein the outer substrate includes: a third region disposed in a region corresponding to the first region; and The fourth region is disposed in a region corresponding to the second region and has a thickness different from that of the third region. Wherein, the second layer is disposed on the third region, and Wherein, the third pad is disposed on the fourth region.

12. The display device according to claim 11, Wherein, The thickness of the fourth region of the outer substrate is thicker than the thickness of the third region of the outer substrate.

13. The display device according to claim 12, Wherein, The outer substrate includes: A third insulating layer, stacked with the third region and the fourth region; and A fourth insulating layer, selectively formed on the third insulating layer of the fourth region.

14. The display device according to claim 10, the display device further Includes: A transparent adhesive layer, disposed between the substrate and the outer substrate.

15. The display device according to claim 1, the display device further Includes: A plurality of conductive balls, configured to electrically connect the second pad and the third pad.

16. The display device according to claim 15, Wherein, The plurality of conductive balls have a diameter of 5 μm to 15 μm.

17. The display device according to claim 1, Wherein, When viewed from above, the second pad and the third pad are stacked in the second region.

18. The display device according to claim 17, Wherein, The third pad does not directly contact the substrate.

19. The display device according to claim 18, Wherein, The first layer and the first pad are coplanar.

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