JP2020024975A - Flexible board and display device - Google Patents

Abstract

To enable a flexible board to be bent severely.SOLUTION: A first wiring pattern 102 includes: first terminal groups 104 that line up in a width direction W at a first end 82; second terminal groups 106 that line up in the width direction W at a second end 84; first wiring groups 108 individually extending to a mounting region 90; and second wiring groups 110 individually extending to the mounting region 90. A bending corresponding region BR includes: a first region R1 overlapping with a first linear line L1 extending in the width direction W; and a pair of second regions R2 individually overlapping with a pair of second linear lines L2 individually extending in the width direction W on both sides of the first region R1 in a lengthwise direction L. A total width in the width direction W of a portion of the first region R1 overlapping with the first linear line L1 is shorter than that of a portion of each of the pair of second regions R2 overlapping with corresponding one of the pair of second linear lines L2. A metal film 116 is provided in each of the pair of second regions R2 by avoiding the first region R1.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a flexible substrate and a display device.

  A COF (Chip on Flexible) is applied to connect a driver IC (Integrated Circuit) to a display such as a liquid crystal display. For example, Patent Documents 1 and 2 disclose connecting a flexible substrate (Flexible Printed Circuit (FPC) board) to which a COF is applied to a liquid crystal display. The flexible substrate is connected to an end of the liquid crystal display, and is bent at its side toward the back surface. Further, Patent Literature 3, Patent Literature 4, and Patent Literature 5 disclose an FPC divided into two branches.

JP 2001-135896 A JP 2006-114569 A JP-A-2014-145843 JP 2006-133271 A JP-A-9-318968

  The base substrate of the flexible substrate has an elastic force, so it is difficult to hold the base substrate, it is difficult to tightly bend, and it is also difficult to bend locally. For this reason, the flexible substrate becomes large around the display and the size of the module cannot be reduced (narrow frame).

  Patent Document 1 discloses that a flexible substrate has a concave shape in plan view and a dummy pattern is provided in order to prevent a crack from occurring at a corner. Patent Literature 2 discloses that the rigidity is increased by using two layers of solder resist on both sides of a bent portion of a flexible substrate.

  An object of the present invention is to enable a flexible substrate to be tightly bent.

  The flexible substrate according to the present invention has flexibility and elasticity, an insulating substrate having a bending resistance against a bending force, a wiring pattern formed on the insulating substrate, and a metal formed on the insulating substrate. A film, and the insulating substrate has a first end and a second end on both sides in a length direction, a mounting area between the first end and the second end, A bending corresponding region between at least one of a first end and the second end and the mounting region, wherein the wiring pattern is at the first end and orthogonal to the length direction. A first terminal group arranged in the width direction, a second terminal group at the second end arranged in the width direction, a first wiring group extending from the first terminal group to the mounting region, A second wiring group extending from the two terminal groups to the mounting region. The response region is a first region overlapping the first straight line extending in the width direction, and a pair of second regions overlapping the pair of second straight lines respectively extending in the width direction on both sides of the first region in the length direction. Wherein the portion where the first region overlaps with the first straight line has a greater total width in the width direction than the portion where each of the pair of second regions overlaps with the corresponding one of the pair of second straight lines. Wherein the metal film is provided in each of the pair of second regions avoiding the first region.

  According to the present invention, the flexible board has a small total resistance in the width direction in the first region, and thus has a low bending resistance, so that the flexible substrate can be tightly bent in the first region. Further, since the metal films are provided on both sides of the first region, the bending resistance in the first region is relatively smaller, and the bending is easily led to the first region.

FIG. 2 is a schematic sectional view of the display device according to the first embodiment. FIG. 2 is a plan view of the display device in which the first flexible substrate shown in FIG. 1 is developed. FIG. 3 is a diagram illustrating a circuit of a display panel. FIG. 4 is a diagram illustrating a circuit configuration of a sub-pixel SP illustrated in FIG. 3. FIG. 5 is a sectional view taken along line VV of the display panel shown in FIG. 2. It is a figure showing the end of a display panel. FIG. 3 is a detailed plan view of a first flexible substrate. FIG. 8 is an enlarged sectional view taken along line VIII-VIII of the display device shown in FIG. 2. FIG. 3 is a perspective view of a second flexible substrate shown in FIG. 2. FIG. 5 is a diagram illustrating the method for manufacturing the display device according to the first embodiment. It is a sectional view showing the display concerning a 2nd embodiment. It is a figure showing the 1st flexible board used for the display concerning a 3rd embodiment. It is a figure showing the 1st flexible board used for the display concerning a 4th embodiment. It is a figure showing the 1st flexible board used for the display concerning a 5th embodiment. It is a figure showing the 1st flexible board used for the display concerning a 6th embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention can be carried out in various modes without departing from the gist of the present invention, and is not to be construed as being limited to the description of the embodiments exemplified below.

  The drawings may be schematically illustrated in terms of width, thickness, shape, and the like of each portion as compared with actual embodiments in order to make the description clearer, but are merely examples, and the interpretation of the present invention is limited. It does not do. In the present specification and each drawing, elements having the same functions as those described in relation to the already described drawings are denoted by the same reference numerals, and redundant description may be omitted.

  Furthermore, in the detailed description of the present invention, when defining the positional relationship between a certain component and another component, `` above '' and `` below '' are only when located directly above or directly below a certain component. Unless otherwise specified, it is intended to include the case where another component is further interposed therebetween.

[First Embodiment]
FIG. 1 is a schematic sectional view of the display device according to the first embodiment. The display device has a display panel 10 and a first flexible substrate 78. The first flexible substrate 78 is electrically connected to the display panel 10 and bends. FIG. 2 is a plan view of the display device in which the first flexible substrate 78 shown in FIG. 1 is developed.

[Display panel]
FIG. 3 is a diagram illustrating a circuit of the display panel 10. The display panel 10 is a liquid crystal display panel in the present embodiment. The display panel 10 includes a display area DA for displaying an image, and a peripheral area PA outside the display area DA. For example, the peripheral area PA surrounds the display area DA and has a frame shape. The display panel 10 includes a plurality of sub-pixels SP in the display area DA. The plurality of sub-pixels SP are arranged in a matrix in the first direction X and the second direction Y. In the present embodiment, one pixel is constituted by three sub-pixels SP adjacent in the first direction X.

  The display panel 10 includes a plurality of scanning lines 12 and a plurality of signal lines 14. The scanning lines 12 extend in the first direction X and are arranged at intervals in the second direction Y. The signal lines 14 extend in the second direction Y and are arranged at intervals in the first direction X. Note that the scanning lines 12 and the signal lines 14 do not necessarily extend linearly, and some of them may be bent. The scanning line 12 is connected to a scanning drive circuit GD. The signal line 14 is connected to the signal drive circuit SD.

  FIG. 4 is a diagram showing a circuit configuration of the sub-pixel SP shown in FIG. The sub-pixel SP includes a thin film transistor 16 arranged near a position where the scanning line 12 and the signal line 14 intersect. The thin film transistor 16 is electrically connected to the scanning line 12 and the signal line 14. The scanning line 12 is connected to the thin film transistors 16 in each of the sub-pixels SP arranged in the first direction X shown in FIG. The signal line 14 is connected to the thin film transistor 16 in each of the sub-pixels SP arranged in the second direction Y shown in FIG.

  The thin film transistor 16 is further electrically connected to the pixel electrode 18. The pixel electrode 18 faces the common electrode 20 and drives the liquid crystal layer 22 by an electric field generated between the pixel electrode 18 and the common electrode 20. The common electrode 20 is connected to the common drive circuit CD shown in FIG. 3 and is arranged over a plurality of sub-pixels SP. The storage capacitor CS is formed between the common electrode 20 and the pixel electrode 18, for example. Further, the common electrode 20 is divided into a plurality of parts, each of the divided common electrodes 20 functions as a detection electrode of the touch panel, and the common drive circuit CD when functioning as a detection electrode of the touch panel may also serve as a touch drive circuit. is there.

  The scanning lines 12 extend in the first direction X and are arranged at intervals in the second direction Y, and the signal lines 14 extend in the second direction Y and are arranged at intervals in the first direction X. In the illustrated example, the pixel electrodes 18 are arranged in a region surrounded by the scanning lines 12 and the signal lines 14.

  FIG. 5 is a cross-sectional view taken along line VV of the display panel 10 shown in FIG. The display panel 10 has a first substrate 24. The first substrate 24 may be a glass substrate, a resin substrate or a flexible substrate. The circuit layer 26 is laminated on the first substrate 24. The circuit layer 26 includes the thin film transistor 16. The thin film transistor 16 includes a semiconductor layer 28, a gate electrode 30, and a first insulating film 32 including a portion interposed therebetween as a gate insulating film. A second insulating film is stacked on the first insulating film 32 so as to cover the gate electrode 30. A drain electrode 38 is provided so as to be connected to the semiconductor layer 28 via a contact hole 36 penetrating the second insulating film 34. A third insulating film 40 is stacked on the second insulating film 34 so as to cover the drain electrode 38.

  Under the thin film transistor 16, a light shielding film 42 made of, for example, a metal is provided on the first substrate 24 to prevent malfunction due to light. A base insulating film 44 is stacked on the first substrate 24 so as to cover the light shielding film 42, and the semiconductor layer 28 is provided on the base insulating film 44.

  The circuit layer 26 has the signal line 14 (FIG. 3) formed in the same layer as the drain electrode 38, and the scanning line 12 (FIG. 3) formed in the same layer as the gate electrode 30. The plurality of signal lines 14 are arranged at intervals in the first direction X, and are arranged between the plurality of pixel electrodes 18 in the display area DA. The source electrode (not shown) of the thin film transistor 16 is formed integrally with the signal line 14 (see FIG. 4).

  The common electrode 20 is arranged on the circuit layer 26 so as to be stacked on the third insulating film 40. The common electrode 20 is formed over a plurality of sub-pixels SP. A fourth insulating film 46 is stacked on the third insulating film 40 so as to cover the common electrode 20. The plurality of pixel electrodes 18 are stacked on the fourth insulating film 46. The pixel electrode 18 has a contact portion 48 penetrating through the fourth insulating film 46 and connecting to the drain electrode 38. The first alignment film 50 is stacked so as to cover the plurality of pixel electrodes 18. The pixel electrode 18 is formed above the common electrode 20 and has a plurality of slits (not shown).

  The display panel 10 has a second substrate 52. The second substrate 52 is provided with a black matrix 54 and a color filter layer 56, and is covered with an overcoat layer 58 on the lower side. The second alignment film 60 is stacked so as to cover the overcoat layer 58. In the illustrated example, the black matrix 54 is disposed between the second substrate 52 and the color filter layer 56, but may be disposed between the color filter layer 56 and the overcoat layer 58. Alternatively, it may be disposed between the overcoat layer 58 and the second alignment film 60.

  The liquid crystal layer 22 is interposed between the first alignment film 50 and the second alignment film 60. The cell gap is held by the plurality of spacers 62. The plurality of spacers 62 are provided on the overcoat layer 58 located between the first alignment film 50 and the overcoat layer 58, and the second alignment is performed so as to cover the overcoat layer 58 and the spacer 62. A film 60 is formed. Note that the first alignment film 50 and the spacer 62 may be in contact with each other, or the second alignment film 60 may be interposed between them. In the illustrated example, a lateral electric field driving method in which the common electrode 20 and the pixel electrode 18 are located on the first substrate 24 side of the display panel 10 is adopted.

[External terminal group]
FIG. 6 is a diagram illustrating an end of the display panel 10. The display panel 10 (first substrate 24) has an external terminal group 64. The external terminal group 64 extends radially along a plurality of straight lines intersecting each other at one point P. The external terminal group 64 is arranged at the end of the first substrate 24 in the width direction W. The external terminal group 64 extends radially along a plurality of straight lines intersecting each other at one point P. For example, it sets the reference line L _R is the center in the width direction W of the first substrate 24, on both sides of the reference line L _R, external terminals 64 are arranged.

  One point P is outside the first substrate 24. Therefore, the external terminal groups 64 are inclined so as to approach each other outward. As a modification, the external terminal group 64 may be inclined outwardly away from each other. One point in that case comes inside the display area DA (FIG. 3).

The external terminal group 64 is arranged so that the intervals D1, D2 (see FIG. 8) between the adjacent terminals are equal (D1 = D2). On the other hand, the external terminal groups 64 are unequal in widths W1 and W2 (see FIG. 8) orthogonal to the length (the length in the direction along the plurality of straight lines). Widths W1, W2 is wider as the distance from the reference line _{L R} (W1 <W2). Therefore, the external terminal groups 64 are arranged at an uneven pitch. Pitch is wider farther from the reference line L _R. The maximum pitch is 1.1 to 2 times the minimum pitch.

[Alignment mark]
The display panel 10 has alignment marks 66 (for example, negative marks) on both sides of the external terminal group 64 in the width direction W. The alignment mark 66 is used for aligning the display panel 10 with the first flexible substrate 78. The outermost external terminal 64 is branched so as to draw a scale line, which is also used for alignment. Further, recognition marks 68 for visually checking the position of the display panel 10 are provided on both sides of the wiring group 70 drawn from the external terminal group 64.

[Backlight module]
The display device has a backlight module 72 as shown in FIG. The backlight module 72 includes a light source such as an LED (Light Emitting Diode), a light guide plate, an optical film, a diffusion plate, a reflection plate, and a frame. Light from the point light source is converted into a surface light source by the light guide plate. The backlight module 72 is located on the back surface 74 side of the display panel 10 (the opposite side of the display surface 76 on which an image is displayed).

[First flexible substrate]
FIG. 7 is a detailed plan view of the first flexible substrate 78. The first flexible substrate 78 is connected to the display panel 10 (the end), as shown in FIG. The first flexible substrate 78 has an insulating substrate 80. The insulating substrate 80 has a first end portion 82 and a second end portion 84 on both sides in the length direction L (the drawing direction from the display panel 10). The insulating substrate 80 has flexibility and elasticity, and has a bending resistance against a bending force. The insulating substrate 80 has a bending corresponding region BR.

  The bending corresponding region BR includes a first region R1. The first region R1 overlaps a first straight line L1 extending in the width direction W orthogonal to the length direction L. The bending corresponding region BR includes a pair of second regions R2. The pair of second regions R2 are on both sides of the first region R1 in the length direction L, and respectively overlap the pair of second straight lines L2. The pair of second straight lines L2 extend in the width direction W on both sides of the first region R1 in the length direction L.

  The insulating substrate 80 has at least one of a notch and a hole (for example, a first notch 86) at at least one of both ends in the width direction W. The first notch 86 overlaps the first straight line L1. The first notch 86 avoids overlapping with the pair of second straight lines L2. The first notch 86 is recessed in the width direction W from the pair of second regions R2.

  The insulating substrate 80 has a cut 88. The cut 88 intersects the first straight line L1 from at least one of both ends in the length direction L of the insulating substrate 80, avoiding the mounting region 90. The cut 88 is located at the center in the width direction W. Due to the cut 88, the plurality of pieces 92 are separated from each other in the width direction W. The insulating substrate 80 includes a plurality of section portions 92.

  The adjacent section portions 92 have two opposing sides S facing each other. At least one (for example, each) of the two opposing sides S has a second notch 94. The second notch 94 is recessed in the width direction W so as to overlap the first straight line L1. Some (e.g., each) of the plurality of sections 92 have a first notch 86 and a second notch 94.

  As shown in FIG. 1, the first flexible substrate 78 is connected to an end of the display panel 10, and has a bent portion 96 so as to bend below the back surface 74 on the side of the display panel 10. The bending portion 96 is a bending corresponding region BR and includes a first region R1 and a pair of second regions R2. The degree of bending in the first region R1 is tighter than in other regions of the bent portion 96.

  As shown in FIG. 7, by forming the first notch 86, the portion where the first region R1 overlaps the first straight line L1 corresponds to the pair of second regions R2 each corresponding to the pair of second straight lines L2. It is smaller in the total width in the width direction W than the portion that overlaps with one of the two. Therefore, since the bending resistance of the first flexible substrate 78 in the first region R1 is small, the first flexible substrate 78 can bend sharply in the first region R1.

[Mounting area and integrated circuit chip]
As shown in FIG. 7, the first flexible substrate 78 (insulating substrate 80) has a mounting area 90 between the first end 82 and the second end 84. There is a bending corresponding area BR between at least one of the first end 82 and the second end 84 and the mounting area 90. An integrated circuit chip 98 is mounted on the mounting area 90 (FIG. 1). The integrated circuit chip 98 is interposed between the first flexible substrate 78 and the display panel 10 (backlight module 72). A spacer 100 is provided to secure a space for disposing the integrated circuit chip 98. If the thickness of the integrated circuit chip 98 is small, the display device can be made thin.

[First wiring pattern]
The first flexible substrate 78 has a first wiring pattern 102 formed on the insulating substrate 80. The first wiring pattern 102 includes a first terminal group 104. The first terminal group 104 is arranged at the first end 82 in the width direction W. The first terminal group 104 extends radially along a plurality of straight lines that intersect each other at one point P. For example, the reference line L _R to the center in the width direction W of the first flexible substrate 78 is set on both sides of the reference line L _R, a first terminal group 104 are arranged.

  One point P is outside the first flexible substrate 78 on the side of the second end 84 opposite to the first end 82. Therefore, the first terminal group 104 is inclined outward and away from each other. As a modification, the first terminal group 104 may be inclined outward to approach each other. One point in that case is on the first end 82 side and outside the first flexible substrate 78.

The first terminal group 104 is equal (w1 = w2) in widths w1 and w2 (see FIG. 8) orthogonal to the length (the length in the direction along the plurality of straight lines). On the other hand, the first terminal group 104 is arranged such that the distances d1 and d2 (see FIG. 8) between adjacent terminals are unequal. Intervals d1, d2 is greater as the distance from the reference line _{L R} (d1 <d2). Therefore, the first terminal groups 104 are arranged at an uneven pitch. Pitch is wider farther from the reference line L _R. The maximum pitch is 1.1 to 2 times the minimum pitch.

  The first wiring pattern 102 includes a second terminal group 106. The second terminal group 106 is arranged at the second end 84 in the width direction W. The second terminal groups 106 extend parallel to each other along the length direction L. The second terminal groups 106 are arranged at equal pitches. As a modification, similarly to the first terminal group 104, the second terminal group 106 may extend radially along a plurality of straight lines that cross each other at one point.

  The first wiring pattern 102 includes a first wiring group 108. The first wiring group 108 extends from the first terminal group 104 to the mounting area 90, respectively. The first wiring pattern 102 includes a second wiring group 110. The second wiring group 110 extends from the second terminal group 106 to the mounting region 90, respectively. The integrated circuit chip 98 is electrically connected to the first wiring group 108 and the second wiring group 110. Between the first notch 86 and the second notch 94, there are some wirings included in one of the first wiring group 108 and the second wiring group 110 (for example, the first wiring group 108).

  The first flexible substrate 78 has first alignment marks 112 (for example, positive marks) on both sides of the first terminal group 104 in the width direction W. By aligning the first alignment mark 112 with the alignment mark 66 of the display panel 10, the display panel 10 and the first flexible substrate 78 are aligned. The outermost first terminal 104 is branched so as to draw a scale line, which is also used for alignment. The first alignment mark 112 sandwiches the first terminal group 104. The first flexible substrate 78 has second alignment marks 114 on both sides of the second terminal group 106 in the width direction W. The second alignment mark 114 sandwiches the second terminal group 106.

[Metal film]
The first flexible substrate 78 has a metal film 116 formed on the insulating substrate 80. The metal film 116 is provided in each of the pair of second regions R2, avoiding the first region R1. Since the metal film 116 is provided on both sides of the first region R1 (a pair of second regions R2), the bending resistance is increased, the bending resistance in the first region R1 is relatively reduced, and the bending is performed in the first region R1. It is easy to guide to the region R1.

  The metal film 116 has a portion adjacent to the first notch 86 in the length direction L and a portion not adjacent to the first notch 86. The metal film 116 has a tip that matches the periphery of the insulating substrate 80. The metal film 116 may be electrically floated, or may be connected to GND to have a noise shielding effect. The metal films 116 are also provided on both sides of the second notch 94 in the length direction L.

[Solder resist]
The first wiring pattern 102 is covered with the solder resist 118. The solder resist 118 has an outer edge inside the edge of the insulating substrate 80. The solder resist 118 does not cover the first alignment mark 112 and the second alignment mark 114 so that they can be seen, but may cover the metal film 116. The metal film 116 has a larger repulsive force than the solder resist 118.

[Connection between display panel and first flexible substrate]
FIG. 8 is an enlarged cross-sectional view taken along line VIII-VIII of the display device shown in FIG. The first terminal group 104 of the first flexible substrate 78 is electrically connected to the external terminal group 64 of the display panel 10, respectively. For the connection, an anisotropic conductive film 120 in which fine metal particles are mixed with a thermosetting resin is used.

  In the external terminal group 64, the distances D1 and D2 between the adjacent terminals are equal (D1 = D2), but the widths W1 and W2 are not equal (W1 <W2), and thus have an uneven pitch. The first terminal group 104 has an equal pitch (w1 = w2) in the widths w1 and w2, but has an uneven pitch because the intervals d1 and d2 between the adjacent terminals are unequal (d1 <d2).

  The insulating substrate 80 of the first flexible substrate 78 has a larger coefficient of thermal expansion than the first substrate 24 (glass substrate) of the display panel 10. When the first flexible substrate 78 expands or contracts more than the first substrate 24, the positions of the first terminal group 104 and the external terminal group 64 are shifted.

  A point P (FIG. 6) at which a plurality of straight lines extending along the external terminal group 64 respectively intersects a point P (FIG. 7) at which a plurality of straight lines extending along the first terminal group 104 intersect. It is designed to be. However, when the first flexible substrate 78 expands or contracts, the point P does not coincide. In that case, the positions of the external terminal group 64 and the first terminal group 104 can be adjusted by relatively moving the first flexible substrate 78 and the display panel 10 so that the point P coincides. That is, the display panel 10 and the first flexible substrate 78 may be relatively moved in the direction of approaching or moving away.

[Second flexible substrate]
FIG. 9 is a perspective view of the second flexible substrate shown in FIG. The display device has a second flexible substrate 122. The second flexible board 122 connects to the first flexible board 78 at the second end 84 (FIG. 7). The second flexible substrate 122 overlaps the display panel 10 so as to face the back surface 74 of the display panel 10. Specifically, the second flexible substrate 122 is below the backlight module 72. The second flexible substrate 122 is fixed (adhered) to the backlight module 72 (frame not shown). A backlight module 72 is provided between the display panel 10 and the first flexible board 78 and the second flexible board 122.

  The second flexible board 122 has a second wiring pattern 124. The second wiring pattern 124 includes several terminals 124 </ b> A for electrically connecting to the second terminal group 106 of the first flexible board 78. The second wiring pattern 124 includes some other terminals 124B for connecting to a circuit board (not shown) (for example, PCB: Printed Circuit Board). The second wiring pattern 124 includes some other terminals 124C for connecting to the third flexible substrate 126 (FIG. 2) connected to the backlight module 72.

[Production method]
FIG. 10 is a diagram illustrating the method for manufacturing the display device according to the first embodiment. The manufacturing process of the display device includes manufacturing the first flexible substrate 78. The first flexible substrate 78 is manufactured by punching out a tape-like film 128. The film 128 is wound over a reel (not shown) and sent out, and a plurality of first flexible substrates 78 are arranged. The solder resist 118 is inside the cutting line. That is, the solder resist 118 is not cut in the punching process. On the other hand, the first wiring pattern 102 and the metal film 116 are cut by punching. That is, the first wiring pattern 102 and the metal film 116 are formed on the film 128 beyond the punching line.

[Second embodiment]
FIG. 11 is a cross-sectional view illustrating a display device according to the second embodiment. The first flexible substrate 278 has a first flat surface 230 bonded to an end of the display panel 10. On the first flat surface 230, there is a first terminal group 104 shown in FIG. As described above, the first terminal group 104 faces and is electrically connected to the external terminal group 64 of the display panel 10. The first flexible substrate 278 has a second flat surface 232 facing the back surface 74 of the display panel 10. An integrated circuit chip 298 is mounted on the second flat surface 232.

  The first flexible substrate 278 has a bent portion 296 so as to bend below the back surface 74 on the side of the display panel 10. The bent portion 296 includes a first region R1 and a pair of second regions R2. The degree of bending in the first region R1 is tighter than in other regions of the bent portion 296.

  In the present embodiment, the first region R1 is located at a position closer to the first flat surface 230 than to an intermediate plane MP located between the first flat surface 230 and the second flat surface 232. That is, the position of at least one of the notch and the hole (for example, the first notch 286) of the first flexible substrate 278 is closer to the first flat surface 230 than the intermediate plane MP.

  According to the present embodiment, as can be seen from comparison with the example of FIG. 1, the first flexible substrate 278 has a sharper bend in the first region R <b> 1, and the bend in the other portions is gentler. Accordingly, disconnection of the wiring pattern can be prevented.

[Third Embodiment]
FIG. 12 is a diagram illustrating a first flexible substrate 378 used in the display device according to the third embodiment. The metal film 316 has an outer edge along the contour of the first notch 386 and the second notch 394 of the insulating substrate 380. However, the metal film 316 is cut on the first straight line L1. That is, the metal film 316 is not continuous on both sides of the first straight line L1 in the length direction L. In a portion where the metal film 316 does not exist (a portion overlapping with the first straight line L1), there is no bending resistance due to the metal film 316. Such a shape can be formed when the first flexible substrate 378 is punched from a film.

[Fourth embodiment]
FIG. 13 is a diagram illustrating a first flexible substrate 478 used in the display device according to the fourth embodiment. In the present embodiment, the first terminal group 404 includes straight terminals 436 in addition to the terminal groups 434 arranged in a radial pattern. Straight pins 436 extend along parallel lines _{L P} parallel to the reference line _{L R.} A pair of straight terminals 436 are provided on both sides of the cut 488 in the width direction W.

[Fifth Embodiment]
FIG. 14 is a diagram illustrating a first flexible substrate 578 used in the display device according to the fifth embodiment. In the present embodiment, the first terminal group 504 is arranged in a separate radial pattern for each section 592. That is, one point P at which a plurality of radially extending straight lines intersect is different for each intercept portion 592.

[Sixth Embodiment]
FIG. 15 is a diagram illustrating a first flexible substrate 678 used in the display device according to the sixth embodiment. In the present embodiment, the first terminal groups 604 are arranged in parallel along the length direction L of the insulating substrate 680.

  The present invention is not limited to the embodiments described above, and various modifications are possible. For example, the configuration described in the embodiment can be replaced with a configuration having substantially the same configuration, a configuration having the same operation and effect, or a configuration capable of achieving the same object.

Reference Signs List 10 display panel, 12 scanning lines, 14 signal lines, 16 thin film transistor, 18 pixel electrode, 20 common electrode, 22 liquid crystal layer, 24 first substrate, 26 circuit layer, 28 semiconductor layer, 30 gate electrode, 32 first insulating film, 34 second insulating film, 36 contact hole, 38 drain electrode, 40 third insulating film, 42 light shielding film, 44 base insulating film, 46 fourth insulating film, 48 contact portion, 50 first alignment film, 52 second substrate, 54 black matrix, 56 color filter layer, 58 overcoat layer, 60 second alignment film, 62 spacer, 64 external terminal group, 66 alignment mark, 68 recognition mark, 70 wiring group, 72 backlight module, 74 back surface, 76 display Surface, 78 first flexible board, 80 insulating board, 82 first end, 84 second end, 86 first notch, 8 Notch, 90 mounting area, 92 section, 94 second notch, 96 bent part, 98 integrated circuit chip, 100 spacer, 102 first wiring pattern, 104 first terminal group, 106 second terminal group, 108 first wiring Group, 110 second wiring group, 112 first alignment mark, 114 second alignment mark, 116 metal film, 118 solder resist, 120 anisotropic conductive film, 122 second flexible substrate, 124 second wiring pattern, 124A terminal, 124B terminal, 124C terminal, 126 third flexible substrate, 128 film, 230 first flat surface, 232 second flat surface, 278 first flexible substrate, 296 bent portion, 298 integrated circuit chip, 316 metal film, 378 first flexible Substrate, 380 insulating substrate, 404 first terminal group, 434 terminals 436 straight terminal, 478 first flexible substrate, 488 cut, 504 first terminal group, 578 first flexible substrate, 592 section, 604 first terminal group, 678 first flexible substrate, 680 insulating substrate, BR , CD common drive circuit, CS storage capacitor, DA display area, D1 interval, d1 interval, D2 intervals, d2 interval, GD scan driving circuit, L the length direction, L1 first straight line, L2 the second straight line, _{L P} parallel lines , _LR reference line, MP intermediate plane, P point, PA peripheral area, R1 first area, R2 second area, S opposing two sides, SD signal drive circuit, SP sub-pixel, W width direction, W1 width, w1 width , W2 width, w2 width, X first direction, Y second direction.

Claims (12)

Having flexibility and elasticity, an insulating substrate having a bending resistance against a bending force,
A wiring pattern formed on the insulating substrate,
A metal film formed on the insulating substrate,
Has,
The insulating substrate includes a first end and a second end on both sides in a length direction, a mounting area between the first end and the second end, and a first end and the second end. A bending corresponding region between at least one of the two end portions and the mounting region,
The wiring pattern includes a first terminal group at the first end arranged in a width direction orthogonal to the length direction, a second terminal group at the second end arranged in the width direction, A first wiring group extending from the first terminal group to the mounting region, and a second wiring group extending from the second terminal group to the mounting region,
The bending corresponding region is a first region overlapping the first straight line extending in the width direction, and a pair of second straight lines respectively overlapping the pair of second straight lines extending in the width direction on both sides of the first region in the length direction. And two regions,
A portion where the first region overlaps with the first straight line is smaller in a total width in the width direction than a portion where each of the pair of second regions overlaps with a corresponding one of the pair of second straight lines,
The flexible substrate, wherein the metal film is provided in each of the pair of second regions, avoiding the first region. The flexible substrate according to claim 1,
A flexible substrate, wherein the insulating substrate has at least one of a notch and a hole so as to avoid overlapping with the pair of second straight lines and overlap with the first straight line. The flexible substrate according to claim 2,
The flexible substrate according to claim 1, wherein the metal film has a portion adjacent to and / or not adjacent to the at least one of the cutout and the hole in the length direction. In the flexible substrate according to claim 2 or 3,
A flexible substrate, wherein the insulating substrate has the notch on at least one of both ends in the width direction so as to be depressed in the width direction from the pair of second regions. The flexible substrate according to claim 4,
The insulating substrate includes, from at least one of both ends in the length direction, a plurality of pieces separated from each other in the width direction by cuts that intersect the first straight line avoiding the mounting region,
The adjacent sections have two opposing sides facing each other,
At least one of the two opposing sides has a second notch so as to overlap with the first straight line and be depressed in the width direction. The flexible substrate according to claim 5,
The plurality of sections include a section having the notch and the second notch,
A flexible substrate, characterized in that between the notch and the second notch, there are some wires included in one of the first wiring group and the second wiring group. The flexible substrate according to claim 5, wherein
The cut is located at the center in the width direction,
A flexible substrate, wherein each of the two opposing sides has the second notch. The flexible substrate according to any one of claims 1 to 7,
The flexible substrate according to claim 1, wherein the metal film has a tip that matches a peripheral edge of the insulating substrate. A flexible substrate according to any one of claims 1 to 8,
An integrated circuit chip mounted on the mounting area of the flexible substrate,
A display panel having an external terminal group electrically connected to the first wiring group and connected to the flexible substrate;
A display device comprising: The display device according to claim 9,
The display panel has a display surface on which an image is displayed and a back surface opposite to the display surface,
The flexible substrate is connected to an end of the display panel, and has a bent portion so as to bend toward the lower side of the back surface at a side of the display panel,
The bent portion includes the first region and the pair of second regions,
The display device, wherein the degree of bending in the first region is tighter than in other regions of the bent portion. The display device according to claim 10,
The flexible substrate has a first flat surface joined to the display panel, and a second flat surface facing the back surface,
The display device according to claim 1, wherein the first region is located closer to the first flat surface than an intermediate plane located between the first flat surface and the second flat surface. The display device according to any one of claims 9 to 11,
A second flexible substrate connected to the flexible substrate at the second end;
The display device, wherein the second flexible substrate is at least indirectly fixed to the display panel.

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