CN114698232A

CN114698232A - Display panel and display device

Info

Publication number: CN114698232A
Application number: CN202210320703.7A
Authority: CN
Inventors: 王佳骏; 许传志
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-07-01

Abstract

The invention provides a display panel and a display device, which comprise a bending area, wherein the bending area comprises a first insulating layer, a wiring layer and a second insulating layer which are sequentially arranged on a substrate, and the wiring layer comprises a plurality of wirings; the plurality of wires extend along a first direction, the plurality of wires are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the first insulating layer and/or the second insulating layer are/is provided with a plurality of preset patterns, the preset patterns extend along a first direction, and the preset patterns are sequentially arranged along a second direction; the thickness of the insulating layer in the area where the preset pattern is located is smaller than that of the insulating layers in other areas; the preset pattern at least comprises a plurality of sub-patterns, the sub-patterns are sequentially arranged along a first direction, the sub-patterns extend along a third direction, the third direction is intersected with the first direction and a second direction, so that stress is released from the multiple directions through the uneven insulating layers in the multiple directions, the stress concentration is reduced, and the problems that the wiring is broken and the like are avoided.

Description

Display panel and display device

Technical Field

The invention relates to the technical field of light-emitting display, in particular to a display panel and a display device.

Background

Currently, the Pad Bending (bonding) technology is the mainstream Bending (bonding) technology because it can significantly shorten the frame width of the display panel. The binding region bending technology usually bends a binding region, which is bound with a Flexible Printed Circuit (FPC) or the like, in a display panel to a backlight side of the display panel. However, the stress of the bending region is large, and the problem of breaking of the trace in the bending region is easily caused.

Disclosure of Invention

In view of the above, the present invention is directed to a display panel and a display device, so as to solve the problem that the bending stress of the bending region of the display panel is large, and the traces in the bending region are easy to break.

In a first aspect, the present invention provides a display panel, including a bending region, where the bending region includes a first insulating layer, a routing layer, and a second insulating layer sequentially disposed on a substrate;

the wiring layer comprises a plurality of wirings; the wires extend along a first direction, the wires are sequentially arranged along a second direction, and the first direction is intersected with the second direction;

at least one of the first insulating layer and the second insulating layer is provided with a plurality of preset patterns, the preset patterns extend along a first direction, and the preset patterns are sequentially arranged along a second direction; the thickness of the insulating layer of the area where the preset pattern is located is smaller than that of the insulating layers of other areas;

the preset pattern at least comprises a plurality of sub-patterns, the sub-patterns are sequentially arranged along the first direction, the sub-patterns extend along a third direction, and the third direction is intersected with the first direction and the second direction.

Optionally, the sub-patterns include a first bending pattern and a second bending pattern, the first bending pattern bends toward the second direction, and the second bending pattern bends toward a direction opposite to the second direction.

Optionally, the first and second folding patterns comprise a semicircular pattern or a zigzag pattern;

preferably, the first bending pattern and the second bending pattern are connected end to form an S-shaped pattern;

or, the first bending pattern and the second bending pattern are connected through a third pattern, and the third pattern comprises a strip pattern.

Optionally, an orthographic projection of at least a part of the first bending pattern on the substrate base plate and an orthographic projection of at least a part of the second bending pattern on the substrate base plate are respectively located on two sides of an orthographic projection of one of the traces on the substrate base plate.

Optionally, an orthographic projection of the preset pattern in the first insulating layer on the substrate does not overlap with an orthographic projection of the preset pattern in the second insulating layer on the substrate.

Optionally, an orthographic projection of each preset pattern on the substrate base plate is overlapped with an orthographic projection of one routing line on the substrate base plate;

preferably, an orthographic projection of the preset pattern in the first insulating layer on the substrate base plate and an orthographic projection of the preset pattern in the second insulating layer on the substrate base plate are respectively overlapped with orthographic projections of two adjacent wires on the substrate base plate.

Optionally, an orthographic projection of the preset pattern on the substrate base plate extends to at least one side of an orthographic projection of the trace on the substrate base plate;

preferably, an orthographic projection of the preset pattern on the substrate base plate extends to two opposite sides of an orthographic projection of the trace on the substrate base plate.

Optionally, an orthographic projection of each preset pattern on the substrate base plate is located in an orthographic projection of a routing gap on the substrate base plate, and the routing gap is a gap between two adjacent routing lines;

preferably, an orthogonal projection of the preset pattern in the first insulating layer on the substrate base plate and an orthogonal projection of the preset pattern in the second insulating layer on the substrate base plate are respectively located in two adjacent routing gaps.

Optionally, the first insulating layer is a substrate, and the second insulating layer is an organic insulating layer;

preferably, the circuit board further comprises a planarization layer, wherein the planarization layer is located on one side, facing away from the routing layer, of the second insulating layer.

In a second aspect, the invention provides a display device comprising a display panel as described in any of the above.

According to the display panel and the display device provided by the invention, the thickness of the insulating layer in the region where the preset pattern is located is smaller than that of the insulating layer in other regions, and the preset pattern at least comprises a plurality of sub-patterns extending along the third direction, so that the sub-patterns extending along the third direction can divide the insulating layer into a plurality of regions with unevenness in each direction intersecting with the third direction. And, since the plurality of predetermined patterns are sequentially arranged along the second direction such that the plurality of sub-patterns are sequentially arranged along the second direction, the insulating layer can be divided into a plurality of regions having irregularities in the second direction. Since the plurality of sub-patterns are sequentially arranged in the first direction, the insulating layer may be divided into a plurality of regions having irregularities in the first direction.

Based on this, through at first direction, second direction and with the crossing insulating layer of unevenness in a plurality of directions of third direction, can release from a plurality of directions the stress that produces when can so that buckle to can reduce the concentration of the stress that produces when buckling effectively, and then can effectively avoid walking the line and appear the fracture scheduling problem.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

FIG. 1 is a schematic top view of a display panel with an unbent bonding region;

FIG. 2 is a schematic cross-sectional view of a display panel with a bent bonding region;

FIG. 3 is a schematic cross-sectional view of a bending region of a display panel;

fig. 4 is a schematic top view illustrating a bending region of a display panel according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of the display panel shown in FIG. 4, wherein the bending region is along a cutting line AA';

FIG. 6 is a schematic cross-sectional view of the display panel shown in FIG. 4, wherein the bending region is along a cutting line BB';

FIG. 7 is a schematic cross-sectional view of the display panel shown in FIG. 4, wherein the bending region is along a cutting line AA';

FIG. 8 is a schematic cross-sectional view of the bending region of the display panel shown in FIG. 4 along a cutting line BB';

fig. 9 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view of the bending region of the display panel shown in FIG. 9 along a cutting line AA';

FIG. 11 is a schematic cross-sectional view of the bending region of the display panel shown in FIG. 9 along a cutting line BB';

fig. 12 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

FIG. 13 is an enlarged view of the structure of a sub-pattern in one embodiment of the present invention;

FIG. 14 is an enlarged view of the structure of a sub-pattern in another embodiment of the present invention;

fig. 15 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

fig. 16 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

fig. 17 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

fig. 18 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

fig. 19 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

fig. 20 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

fig. 21 is a schematic top view illustrating a bending region of a display panel according to another embodiment of the present invention;

FIG. 22 is a schematic cross-sectional view of the display panel shown in FIG. 9, wherein the bending region is along a cutting line AA';

fig. 23 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic top view of a display panel with an unbent bonding area, as shown in fig. 1, the display panel includes a display area AA and a non-display area NA, the non-display area NA includes a bonding area NA1, the bonding area NA1 includes a plurality of traces 10, a driving chip 11 electrically connected to the plurality of traces 10, and a flexible circuit board 12 electrically connected to the driving chip 11.

The display area AA includes a plurality of pixel units arranged in an array, each row of pixel units is connected to one scan line, and each column of pixel units is connected to one data line. The scanning lines may be electrically connected to the driver chip 11 through a scanning driver circuit or the like, and the data lines may be electrically connected to the driver chip 11 through a multiplexer circuit or the like. The driving chip 11 is electrically connected to the scan driving circuit and the multiplexing circuit through the traces 10 located in the bending area NAS, so as to drive each pixel unit to emit light to display an image.

It is understood that, as shown in fig. 1, the driving chip 11 may be electrically connected to the flexible wiring board 12 through traces, pads, and the like, and further, the driving chip 11 may also be electrically connected to the flexible wiring board 12 through direct contact, for example, the driving chip 11 may be disposed on the flexible wiring board 12.

Fig. 2 is a schematic cross-sectional structure diagram of a display panel after bending a bonding area, as shown in fig. 2, the bonding area NA1 where the display panel has the trace 10, the driver chip 11 and the flexible circuit board 12 is bent to the back side, i.e., the backlight side, of the display panel, so as to increase the screen occupation ratio of the display area AA, decrease the screen occupation ratio of the non-display area NA, and shorten the frame width of the display panel. However, the bending stress of the bending area NAs in the bending state in the binding area NA1 is large, which results in a large bending stress to be borne by the trace 10.

As shown in fig. 3, fig. 3 is a schematic cross-sectional structure diagram of a bending region of a display panel, in which although the traces 10 are covered by the insulating layer 13, the traces 10 can be protected by the insulating layer 13 to a certain extent, but the stress generated when the bending region NAS is bent can also be propagated in the insulating layer 13 and concentrated in a partial region, so that the traces 10 in the partial region are prone to fracture and other problems.

Based on this, embodiments of the present invention provide a scheme for reducing stress concentration, so as to reduce the concentration of stress generated during bending and avoid the problems of cracking of the trace by arranging a specific preset pattern in the insulating layer above and/or below the trace and making the thickness of the insulating layer in the region where the preset pattern is located smaller than the thickness of the insulating layer in other regions.

As an optional implementation of the disclosure, an embodiment of the present invention provides a display panel, which may be a flexible display panel. The display panel includes a bending region 40, and the bending region 40 may be the bending region located in the bonding region NA1 shown in fig. 1 and fig. 2, but the present invention is not limited thereto, and in other embodiments, the bending region 40 may also be a bending region located in other portions of the flexible display panel, such as a bending region located in a middle portion of the flexible display panel.

In some embodiments of the present invention, the structure of the bending region of the display panel is shown in fig. 4 to fig. 6, where fig. 4 is a schematic top view structure of the bending region of the display panel according to an embodiment of the present invention, fig. 5 is a schematic cross-sectional structure of the bending region of the display panel shown in fig. 4 along a cutting line AA ', and fig. 6 is a schematic cross-sectional structure of the bending region of the display panel shown in fig. 4 along a cutting line BB'.

As shown in fig. 5 and 6, the bending region 40 includes a first insulating layer 402, a routing layer and a second insulating layer 404 sequentially disposed on the substrate 401, and the routing layer includes a plurality of traces 403.

The substrate 401 is a flexible substrate, and the material of the flexible substrate may be thin Stainless Steel (SUS for short) or flexible Polyimide (PI for short).

As shown in fig. 4, each of the traces 403 extends along the first direction Y, and a plurality of the traces 403 are sequentially arranged along the second direction X. Wherein the first direction Y intersects the second direction X. In some alternative examples, the first direction Y and the second direction X may be perpendicular.

Each of the predetermined patterns 405 extends in the first direction Y, and a plurality of the predetermined patterns 405 are sequentially arranged in the second direction X. In some optional examples, as shown in fig. 4, the plurality of predetermined patterns 405 and the plurality of traces 403 are respectively disposed correspondingly, although the invention is not limited thereto, in other examples, the plurality of predetermined patterns 405 may not be disposed correspondingly to the plurality of traces 403, and details are not described herein again.

Each preset pattern 405 includes a plurality of sub-patterns 4050, the sub-patterns 4050 in each preset pattern 405 are sequentially arranged along a first direction Y, and each sub-pattern 4050 extends along a third direction P, and the third direction P intersects with both the first direction Y and the second direction X. Stress that produces when making buckle releases from a plurality of directions to can reduce the concentration nature of the stress that produces when buckling effectively, and then can effectively avoid the line 403 of buckling the district 40 to appear fracture scheduling problem.

In the embodiment of the invention, the first insulating layer 402 and/or the second insulating layer 404 have a plurality of predetermined patterns 405. As shown in fig. 5 and 6, the insulating layer thickness d1 of the region where the predetermined pattern 405 is located is smaller than the insulating layer thickness d2 of other regions, or the predetermined pattern 405 is a groove or a concave pattern, so that the insulating layer forms an uneven region. The predetermined pattern 405 may be formed by etching the insulating layer, or the insulating layer having the predetermined pattern 405 may be formed by a Half-Tone (Half-Tone) process.

Since the thickness of the insulating layer in the region where the predetermined pattern 405 is located is smaller than the thickness of the insulating layer in other regions, and the predetermined pattern 405 at least includes a plurality of sub-patterns 4050 extending along the third direction P, and the third direction P intersects with both the first direction Y and the second direction X, the sub-patterns 4050 extending along the third direction P can divide the insulating layer into a plurality of regions with unevenness in a plurality of directions intersecting with the third direction P. Also, since the plurality of preset patterns 405 are sequentially arranged in the second direction X, that is, the plurality of sub-patterns 4050 are sequentially arranged in the second direction X, the insulating layer may be divided into a plurality of regions having irregularities in the second direction X. Since the plurality of sub-patterns 4050 are sequentially arranged in the first direction Y, the insulating layer may be divided into a plurality of rugged regions in the first direction Y.

Based on this, through at first direction Y, second direction X and with the crossing insulating layer of unevenness in a plurality of directions of third direction P, can release from a plurality of directions the stress that produces when can making buckle to can reduce the concentration nature of the stress that produces when buckling effectively, and then can effectively avoid 40 walking of bending district 403 to appear the fracture scheduling problem.

In some embodiments of the present invention, as shown in fig. 5 or fig. 6, only the second insulating layer 404 of the first insulating layer 402 and the second insulating layer 404 has a plurality of predetermined patterns 405. The thickness d1 of the second insulating layer 404 in the area where the predetermined pattern 405 is located is smaller than the thickness d2 of the second insulating layer 404 in other areas.

Of course, the present invention is not limited thereto, and in other embodiments, as shown in fig. 7 or fig. 8, fig. 7 is a schematic cross-sectional view of the bending region of the display panel shown in fig. 4 along a cutting line AA ', fig. 8 is a schematic cross-sectional view of the bending region of the display panel shown in fig. 4 along a cutting line BB', and only the first insulating layer 402 of the first insulating layer 402 and the second insulating layer 404 has a plurality of predetermined patterns 405. The thickness d3 of the first insulating layer 402 in the area where the predetermined pattern 405 is located is smaller than the thickness d4 of the first insulating layer 402 in other areas.

In other embodiments, the first insulating layer 402 and the second insulating layer 404 both have a plurality of predetermined patterns 405. Moreover, in some optional examples, in order to avoid that the insulating layer is too thin in the same region and the insulating layer is broken when being bent, as shown in fig. 9, fig. 9 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, an orthographic projection of the predetermined pattern 405 in the first insulating layer 402 on the substrate base 401 does not overlap with an orthographic projection of the predetermined pattern 405 in the second insulating layer 404 on the substrate base 401, so that the predetermined pattern 405 in the first insulating layer 402 and the predetermined pattern 405 in the second insulating layer 404 are located in different regions.

As shown in fig. 10 or fig. 11, fig. 10 is a schematic cross-sectional view of the bending region of the display panel shown in fig. 9 along a cutting line AA ', and fig. 11 is a schematic cross-sectional view of the bending region of the display panel shown in fig. 9 along a cutting line BB', in which the first insulating layer 402 and the second insulating layer 404 both have a predetermined pattern 405, so as to further increase the difference between the maximum thickness d3 and the minimum thickness d4 of the second insulating layer 404 on the basis of ensuring that the insulating layers are not easily broken during bending, so as to further enhance the stress release effect of the second insulating layer 404.

In some embodiments of the present invention, as shown in fig. 4 and fig. 9, an orthographic projection of each predetermined pattern 405 on the substrate 401 overlaps with an orthographic projection of one trace 403 on the substrate 401. That is, the orthographic projection of the trace 403 on the substrate base 401 partially overlaps the orthographic projection of the preset pattern 405 on the substrate base 401, and partially does not overlap the orthographic projection of the preset pattern 405 on the substrate base 401. An orthographic projection of each preset pattern 405 in the first insulating layer 402 and/or the second insulating layer 404 on the substrate 401 overlaps with an orthographic projection of one trace 403 on the substrate 401.

Based on this, the height of the routing wire 403 which overlaps with the orthographic projection of the preset pattern 405 can be made lower than the height of the routing wire 403 which does not overlap with the orthographic projection of the preset pattern 405, so that the routing wire 403 is arranged in a fluctuating manner in the first direction Y, that is, the routing wire 403 has a structure of climbing up and down in the first direction Y, and therefore the concentration of stress generated during bending can be further reduced, and further the problems that the routing wire 403 in the bending area 40 is broken and the like can be further avoided.

On this basis, in some embodiments of the present invention, an orthogonal projection of the predetermined pattern 405 on the substrate base 401 extends at least to one side of an orthogonal projection of the trace 403 on the substrate base 401. That is, the orthographic projection of the preset pattern 405 on the substrate base plate 401 overlaps with the orthographic projection of the trace 403 on the substrate base plate 401, and the overlapped portion may extend at least to one side of the orthographic projection of the trace 403 on the substrate base plate 401.

In some alternative examples, the orthographic projection of the preset pattern 405 on the substrate base plate 401 extends to opposite sides of the orthographic projection of the trace 403 on the substrate base plate 401. As shown in fig. 9, the orthographic projection of the preset pattern 405 on the substrate base plate 401 extends to the left and right sides of the orthographic projection of the trace 403 on the substrate base plate 401, so as to release the stress through the preset pattern on the left and right sides of the trace 403 at the same time, so that the stress on the left and right sides of the trace 403 is equal, and the problem that the trace 403 is broken due to overlarge stress on one side is avoided.

Of course, the present invention is not limited thereto, and in other embodiments, an orthogonal projection of each predetermined pattern 405 on the substrate 401 may not overlap with an orthogonal projection of the trace 403 on the substrate 401. As shown in fig. 12, fig. 12 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, an orthographic projection of each predetermined pattern 405 on a substrate 401 is located within an orthographic projection of a trace gap 408 on the substrate 401, and the trace gap 408 is a gap between two adjacent traces 403. The orthographic projection of the predetermined pattern 405 in the first insulating layer 402 and/or the second insulating layer 404 on the substrate 401 is located within the orthographic projection of a trace gap 408 on the substrate 401. It is understood that the cross-sectional structure of the display panel shown in fig. 12 is similar to the structures shown in fig. 6, 8 and 11, and thus, the description thereof is omitted.

In some embodiments of the present invention, as shown in fig. 9, an orthogonal projection of the predetermined pattern 405 in the first insulating layer 402 on the substrate base 401 and an orthogonal projection of the predetermined pattern 405 in the second insulating layer 404 on the substrate base 401 respectively overlap with orthogonal projections of two adjacent traces 403 on the substrate base 401. For example, an orthographic projection of the preset pattern 405 in the first insulating layer 402 on the substrate base plate 401 partially overlaps with an orthographic projection of the trace 403a on the substrate base plate 401, and an orthographic projection of the preset pattern 405 in the second insulating layer 404 on the substrate base plate 401 partially overlaps with an orthographic projection of the trace 403b on the substrate base plate 401.

Based on this, as shown in fig. 10, not only can the thicknesses of the insulating layers above and below the two

adjacent traces

403a and 403b be made different, that is, the first insulating layer 402 and the second insulating layer 404 are arranged in a fluctuating manner at the two

traces

403a and 403b, respectively, and the first insulating layer 402 and the second insulating layer 404 are made to release the stress at the two

traces

403a and 403b, respectively, but also the two

adjacent traces

403a and 403b can be made to have a height difference d5, so that the traces 403 arranged in sequence in the second direction X are arranged in a fluctuating manner, that is, the traces 403 are made to climb up and down in the second direction X, which helps to further reduce the concentration of the stress generated when being bent. The multiple climbing can disperse the concentrated stress at a certain maximum stress point when the trace 403 is bent, which helps to reduce the undesirable problems such as wire breakage caused by bending.

Of course, the invention is not limited thereto, and in other embodiments, as shown in fig. 12, an orthogonal projection of the predetermined pattern 405 in the first insulating layer 402 on the substrate 401 and an orthogonal projection of the predetermined pattern 405 in the second insulating layer 404 on the substrate 401 are respectively located in two adjacent trace gaps 408. For example, an orthogonal projection of the predetermined pattern 405 in the first insulating layer 402 on the substrate base plate 401 is located in the trace gap 408a, and an orthogonal projection of the predetermined pattern 405 in the second insulating layer 404 on the substrate base plate 401 is located in the trace gap 408 b.

In some embodiments of the present invention, as shown in fig. 13, fig. 13 is an enlarged view of a structure of a sub-pattern 4050 in an embodiment of the present invention, where the sub-pattern 4050 includes a first bending pattern 4050a and a second bending pattern 4050b, the first bending pattern 4050a is bent toward a second direction X, and the second bending pattern 4050b is bent toward a direction X' opposite to the second direction X, so as to release stress generated during bending from directions perpendicular to a circumference, so as to further reduce concentration of the stress generated during bending, and further effectively avoid problems such as breaking of the trace 403.

In some optional examples, an orthographic projection of at least a portion of the first bending pattern 4050a on the substrate base 401 and an orthographic projection of at least a portion of the second bending pattern 4050b on the substrate base 401 are respectively located on both sides of an orthographic projection of the trace 403 on the substrate base 401. As shown in fig. 9, an orthographic projection of a portion of the first bending pattern 4050a on the substrate base 401 and an orthographic projection of a portion of the second bending pattern 4050b on the substrate base 401 are respectively located on the left and right sides of an orthographic projection of the trace 403 on the substrate base 401, so that the stress on the left and right sides of the trace 403 is equal, and the problem that the trace 403 is broken due to an excessive stress on one side is avoided.

It should be noted that, as shown in fig. 9, the first bending pattern 4050a and the second bending pattern 4050b located at two sides of the orthographic projection of the trace 403 on the substrate 401 may be connected, and the orthographic projection of the connected portion on the substrate 401 may overlap the orthographic projection of the trace 403 on the substrate 401. Of course, the present invention is not limited thereto, and in other embodiments, the first bending pattern 4050a and the second bending pattern 4050b on two sides of the orthographic projection of the trace 403 on the substrate 401 may not be connected, which is not described herein again.

In some embodiments of the present invention, as shown in fig. 13, the first bending pattern 4050a and the second bending pattern 4050b include a semicircular pattern, and the first bending pattern 4050a and the second bending pattern 4050b are connected end to form an S-shaped pattern.

Of course, the present invention is not limited thereto, and in other embodiments, as shown in fig. 14, fig. 14 is an enlarged view of a sub-pattern 4050 in another embodiment of the present invention, wherein the first bending pattern 4050a and the second bending pattern 4050b are connected by a third pattern 4050c, and the third pattern 4050c includes a stripe pattern.

In some embodiments of the present invention, as shown in fig. 15, fig. 15 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, and the predetermined pattern 405 includes a sub-pattern 4050 shown in fig. 14. In some embodiments, as shown in fig. 15, an orthographic projection of the predetermined pattern 405 on the substrate base plate 401 may be located in an orthographic projection of the trace gap 408 on the substrate base plate 401, and in other embodiments, as shown in fig. 16, fig. 16 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, and the orthographic projection of the predetermined pattern 405 on the substrate base plate 401 may also partially overlap with the orthographic projection of the trace 403 on the substrate base plate 401.

Of course, the present invention is not limited thereto, and in other embodiments, the first and

second bending patterns

4050a and 4050b include zigzag patterns. As shown in fig. 17, fig. 17 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, and the predetermined pattern 405 includes a sub-pattern 4050 having an S-shaped bending line pattern. In some embodiments, as shown in fig. 17, an orthographic projection of the predetermined pattern 405 on the substrate base plate 401 may partially overlap with an orthographic projection of the trace 403 on the substrate base plate 401, and in other embodiments, as shown in fig. 18, fig. 18 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, and the orthographic projection of the predetermined pattern 405 on the substrate base plate 401 may also be located in an orthographic projection of the trace gap 408 on the substrate base plate 401.

As shown in fig. 19, fig. 19 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, where the predetermined pattern 405 includes a sub-pattern 4050 having a bar pattern, and an orthographic projection of the predetermined pattern 405 on the substrate 401 overlaps with an orthographic projection of the trace 403 on the substrate 401, and in other embodiments, as shown in fig. 20, fig. 20 is a schematic top view structure diagram of a bending region of a display panel according to another embodiment of the present invention, an orthographic projection of the predetermined pattern 405 on the substrate 401 may also be located in an orthographic projection of the trace gap 408 on the substrate 401.

In some embodiments of the present invention, as shown in fig. 19 and 20, the sub-patterns 4050 sequentially arranged along the first direction Y may be connected to each other to make the predetermined pattern 405 a continuous pattern, but the present invention is not limited thereto, and in other embodiments, as shown in fig. 21, fig. 21 is a schematic top view structure diagram of the bending region of the display panel according to another embodiment of the present invention, and the sub-patterns 4050 sequentially arranged along the first direction Y may not be connected to make the predetermined pattern 405 a discontinuous pattern.

In the embodiment of the present invention, only the seed patterns 4050 are described as examples, but not limited thereto. The sub-pattern 4050 disclosed in the embodiment of the present invention is rotated or flipped to obtain a pattern within the scope of the present invention.

In some embodiments of the present invention, the first insulating layer 402 and the second insulating layer 404 may both be organic insulating layers. For example, the material of the first insulating layer 402 is flexible polyimide PI, and the material of the second insulating layer 404 is Poly Lactic Acid (PLA). Of course, the invention is not limited thereto, and in other embodiments, the first insulating layer 402 and the second insulating layer 404 may be other organic insulating materials, or the first insulating layer 402 or the second insulating layer 404 may be inorganic insulating materials, such as silicon dioxide or silicon nitride.

Based on this, the direct contact between the trace 403 and the inorganic insulating layer can be avoided, because the inorganic insulating layer is more brittle and more prone to form cracks when being bent, compared with the organic insulating layer, and these cracks can cause the problem that the trace 403 in contact with the crack breaks.

In some alternative examples, as shown in fig. 22, fig. 22 is another schematic cross-sectional structure of the bending region of the display panel shown in fig. 9 along a cutting line AA', a buffer layer 406 may further be disposed between the substrate 401 and the first insulating layer 402, and the material of the buffer layer 406 may be silicon dioxide or silicon nitride.

In some optional examples, a side surface of the second insulating layer 404 facing away from the routing layer further has a planarization layer (PDL) 407. The material of the planarization layer 407 may be an inorganic material, such as silicon dioxide or silicon nitride, for example, although the invention is not limited thereto, in other embodiments, the material of the planarization layer 407 may also be an organic material, such as PI, and the description thereof is omitted. Of course, in other embodiments, other film layers may be further disposed as needed, and are not described herein again.

As another alternative implementation of the present disclosure, an embodiment of the present invention provides a flexible display device, which includes the display panel provided in any one of the above embodiments. As shown in fig. 23, fig. 23 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device includes a smart phone, but the present invention is not limited thereto, and in other embodiments, the display device may further include a wearable display device such as a digital camera, a tablet computer, and smart glasses.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The display panel is characterized by comprising a bending area, wherein the bending area comprises a first insulating layer, a wiring layer and a second insulating layer which are sequentially arranged on a substrate;

the wiring layer comprises a plurality of wirings; the plurality of routing wires extend along a first direction, the plurality of routing wires are sequentially arranged along a second direction, and the first direction is intersected with the second direction;

the first insulating layer and/or the second insulating layer are/is provided with a plurality of preset patterns, the preset patterns extend along the first direction, and the preset patterns are sequentially arranged along the second direction; the thickness of the insulating layer in the area where the preset pattern is located is smaller than that of the insulating layers in other areas;

2. The display panel according to claim 1, wherein the sub-pattern comprises a first bending pattern and a second bending pattern, the first bending pattern bends toward the second direction, and the second bending pattern bends toward a direction opposite to the second direction.

3. The display panel according to claim 2, wherein the first and second folding patterns comprise a semicircular pattern or a zigzag pattern;

4. The display panel according to claim 2, wherein an orthographic projection of at least a portion of the first bending pattern on the substrate base plate and an orthographic projection of at least a portion of the second bending pattern on the substrate base plate are respectively located on two sides of an orthographic projection of one of the traces on the substrate base plate.

5. The display panel according to claim 1, wherein an orthogonal projection of the predetermined pattern in the first insulating layer on the substrate base does not overlap an orthogonal projection of the predetermined pattern in the second insulating layer on the substrate base.

6. The display panel according to claim 1 or 5, wherein an orthographic projection of each of the predetermined patterns on the substrate base plate overlaps with an orthographic projection of one of the traces on the substrate base plate;

7. The display panel according to claim 6, wherein an orthographic projection of the preset pattern on the substrate base plate extends at least to one side of an orthographic projection of the trace on the substrate base plate;

8. The display panel according to claim 1 or 5, wherein an orthographic projection of each of the predetermined patterns on the substrate base is located within an orthographic projection of a trace gap on the substrate base, the trace gap being a gap between two adjacent traces;

9. The display panel according to claim 1, wherein the first insulating layer is a substrate, and wherein the second insulating layer is an organic insulating layer;

10. A display device comprising the display panel according to any one of claims 1 to 9.