CN113707021B

CN113707021B - Display panel and display device

Info

Publication number: CN113707021B
Application number: CN202111006046.0A
Authority: CN
Inventors: 林新琦; 朱红
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2023-07-04
Anticipated expiration: 2041-08-30
Also published as: CN113707021A

Abstract

The invention provides a display panel and a display device, belongs to the technical field of curled display, and can at least partially solve the problem that poor wiring connection areas of the existing slide roll display panel are easy to occur. A display panel of the present invention includes: a display part and a wiring part; the wiring part is positioned in the peripheral area of the display part; the wiring section has: the first wiring bending region and the second wiring bending region; the wire part positioned in the first wire bending area can be bent to the first surface side of the display part around the first axis; the wire part positioned in the second wire bending area can be bent to the first surface side of the display part around the second axis; the first axis intersects with the second axis, and the first wiring bending region and the second wiring bending region are overlapped; the wire routing part comprises at least one first slot, and the first slot is positioned in the overlapping area of the first wire routing bending area and the second wire routing bending area; the first slot penetrates the wire-running part in the thickness direction of the wire-running part, and the extending direction of the first slot is parallel to the second axis.

Description

Display panel and display device

Technical Field

The invention belongs to the technical field of curled display, and particularly relates to a display panel and a display device.

Background

Recently, as flexible displays are accelerated, display screens are being developed toward diversification. The development of the folding mobile phone brings wide development space for flexible display, and the sliding and rolling type flexible display screen also gradually enters the field of vision of people. The roll-up technology is another innovative application field of the flexible display panel, and the form realizes that a consumer can randomly switch the display area of the flexible display panel according to the self needs, so that the roll-up technology is convenient for the user to carry about, provides the user with use experience better than that of a folding display panel, and is an important direction of the development of the flexible display panel.

The manner of sliding crimping is divided into a single side and a double side. The double-side sliding roll can roll the display screen with a larger length-width ratio from the short sides of the two sides. The wiring part of the flexible display panel is arranged on at least one side of the display part, or is a long side or a short side.

Disclosure of Invention

The invention at least partially solves the problem that poor arrangement of the wiring area at the stretching end in the existing slide roll display screen is easy to occur, and provides the display panel which can be used for arranging the wiring area at the non-stretching end and realizing curling.

The technical scheme adopted for solving the technical problem of the invention is a display panel, comprising: a display part and a wiring part; the wiring part is positioned in the peripheral area of the display part; the wiring part has: the first wiring bending region and the second wiring bending region;

the wire part positioned in the first wire bending area can be bent to the first surface side of the display part around a first axis;

the wire part positioned in the second wire bending area can be bent to the first surface side of the display part around a second axis;

the first axis intersects the second axis, and the first wire bending region overlaps the second wire bending region;

the wire routing part comprises at least one first slot, and the first slot is positioned in the overlapping area of the first wire routing bending area and the second wire routing bending area; the first slot penetrates through the wire routing part in the thickness direction of the wire routing part, and the extending direction of the first slot is parallel to the second axis.

In some embodiments, the number of first slots comprises a plurality;

the plurality of first slots are arranged along a first direction, and the first direction is parallel to the first axis.

In some embodiments, the first slot has an extension length equal to a dimension of the first trace bending region in a direction parallel to the second axis.

In some embodiments, the trace portion includes:

a substrate;

a back film disposed on a first side of the substrate;

the dielectric layer is arranged on the second surface side of the substrate;

the signal wiring layer is arranged on the second surface side of the substrate.

In some embodiments, the trace portion includes at least one second slot, the second slot being located in the second trace bending region; the second slot penetrates through the back film in the thickness direction of the wiring part, and the extending direction of the second slot is parallel and perpendicular to the second axis.

In some embodiments, the second slots are in one-to-one correspondence with the first slots.

In some embodiments, the trace portion includes at least one third opening, the third opening being located in the second trace bending region; the third opening penetrates through the dielectric layer in the thickness direction of the wiring part, and the second slotting extending direction is parallel and perpendicular to the second axis;

a stress release part is arranged in the third opening; the equivalent elastic modulus of the stress relief portion is smaller than the equivalent elastic modulus of the dielectric layer.

In some embodiments, the material of the dielectric layer comprises an inorganic material; the material of the stress relief portion comprises an organic material.

In some embodiments, the display panel further comprises: the flattening layer is arranged on one side of the dielectric layer, which is away from the substrate;

the flattening layer and the stress release part are of an integrated structure.

The technical scheme adopted for solving the technical problem of the invention is a display device, comprising: any one of the display panels described above.

In some embodiments, the display panel comprises a slider display panel;

the roll display panel is roll-able about a second axis.

In some embodiments, the display device further comprises:

the sliding roll scroll is arranged on the first surface side of the display panel and is parallel to the second axis;

the sliding winding shaft is provided with a first end 500 corresponding to the first wiring bending area; the shape of the first end 500 includes a regular polygonal prism structure;

the edge of the prismatic structure corresponds to the first slot.

In some embodiments, the pitch of two adjacent first slots is no greater than the prism structure side width.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:

fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the invention;

fig. 2 is a schematic structural diagram of a trace portion of a display panel according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a display panel according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a display device according to an embodiment of the invention;

fig. 5 is a schematic structural diagram of another display device according to an embodiment of the invention;

fig. 6 is a schematic layer structure of a trace portion according to an embodiment of the invention.

Detailed Description

The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

In one aspect, referring to fig. 1 to 6, the present embodiment provides a display panel. The display panel includes: a display section 200 and a wiring section 100; the trace part 100 is positioned in the peripheral area of the display part 200; the wiring section 100 includes: the first bending region 110, the trace portion 100 located in the first bending region 110 can be bent to the first surface side of the display portion 200 around the first axis.

The display portion 200 may be provided therein with a plurality of pixel units, each including a display device, a driving device, and the like. Referring to fig. 2, a signal trace may be disposed in the trace portion 100, and the signal trace is connected to each pixel unit in the display portion 200 and connected to a system control terminal through a connection area 120, so as to implement display control on the pixel unit. Referring to fig. 3, in order to achieve a narrower frame, the trace portion 100 may be bent to the first surface side of the display portion 200. The first surface side of the display portion 200 may be a non-display surface side of the display portion 200, that is, the trace portion 100 may be bent to the back of the display portion 200.

In this embodiment, the first surface side of the display unit 200 and the first surface side of the display panel are both the non-display surface side of the display panel in the unfolded state.

The shape of the display panel may include rectangular, square, etc., and in order to more clearly describe the display panel in this embodiment, the following description will take the shape of the display panel as a rectangular example.

Specifically, referring to fig. 1, the trace 100 may be located on one side (e.g., a long side in fig. 1) of the display portion 200, and the trace 100 has a first side close to the display portion 200 and a second side far from the display portion 200. The second side of the trace portion 100 may be located at the back (the first side) of the display portion 200 by bending the first bending region 110, and at this time, the first bending region 110 of the trace portion 100 forms an arc region after bending, so that the display panel has a first state. In the first state, the display portion 200 of the display panel is not bent and is in a flat state.

In order to realize the state of bending, rolling, and the like of the display panel, the display portion 200 needs to be bent in addition to the narrow frame. Referring to fig. 1, theoretically, the display panel may be bent around a first axis (horizontal direction in fig. 1) or the display panel may be bent along a second axis (vertical direction in fig. 1). It can be understood that, in the first state, when the bending direction of the whole display panel is parallel to the bending direction of the first bending region of the trace portion 100, the bending state of the trace portion 100 will not affect the whole bending process of the display panel, but the connection region 120 of the trace portion 100 is prone to be poor along with the increase of the number of curling of the display panel. When the overall bending direction of the display panel is crossed with the bending of the first bending region of the trace portion 100, the first bending trace region 112 of the trace portion 100 is in a bending and curling state, which can obstruct the overall bending of the display panel and force the display panel to bend, which can cause the first bending trace region 112 of the trace portion 100 to die and break the signal trace.

In view of this technical problem, in the display panel provided in this embodiment, the trace portion 100 is designed as follows: referring to fig. 1 and 2, the trace portion 100 further includes a second bending region (see left and right dashed-line frame regions in fig. 1), and the trace portion 100 located in the second bending region can be bent to the first surface side of the display portion 200 around the second axis; the first axis intersects the second axis and there is overlap of the first inflection region 110 with the second inflection region. The trace portion 100 includes at least one first slot 111, where the first slot 111 is located in an overlapping area of the first bending region 110 and the second bending region; the first slot 111 penetrates the trace portion 100 in the thickness direction of the trace portion 100, and the extending direction of the first slot 111 is parallel to the second axis. In the display panel provided in the embodiment, the first bending region 110 of the trace portion 100 may be bent around the first axis, and then the second bending region of the trace portion 100 may be bent around the second axis. Because the overlapping area of the first bending area 110 and the second bending area is provided with the first slot 111, after the wire-moving portion 100 is bent for the first time, the first slot 111 divides the wire-moving portion 100 into a plurality of wire-moving areas 112, the extending direction of the first slot 111 and the extending direction of the wire-moving areas 112 are parallel to the second axis, and when the wire-moving portion 100 is bent around the second axis, the first slot 111 can define a bending path for the first bending area in the bending process and plays a role of releasing stress, thereby avoiding dead bending of the first bending area 110.

In some embodiments, after the trace portion 100 bends the back side of the value display portion 200, the trace portion may be fixed to the display portion 200 by the adhesive layer 400. The adhesive layer can comprise double-sided adhesive tape, and the material can specifically comprise acrylic material.

In some embodiments, the shape of the display panel includes a rectangle, the direction of the first axis is parallel to the long side direction of the display panel (refer to the horizontal direction in fig. 1), and the direction of the second axis may be parallel to the short side direction of the display panel (refer to the vertical direction in fig. 1).

In some embodiments, the number of first slots 111 includes a plurality; the plurality of first grooves 111 are arranged along a first direction, which is parallel to the first axis. Referring to fig. 2, by the plurality of first slits 111 disposed in the first direction, a plurality of stress relief can be achieved when the first bending region 110 is bent around the second axis, thereby better achieving bending and curling of the display panel.

In some embodiments, the extension length of the first slot 111 is the same as the dimension of the first bending region 110 in a direction parallel to the second axis. Referring to fig. 2 to 5, the trace portion 100 has a dead fold problem only in the overlapping area of the first bending region 110 and the second bending region, so that the first bending region 110 can better match the bending of the display panel around the second axis by making the extension length of the first slot 111 identical to the dimension of the first bending region 110 in the direction parallel to the second axis.

The width of the first slot 111 includes: 100-1000 microns. In this embodiment, the first bending region 110 of the trace portion 100 is divided into a plurality of trace regions 112 by the first slot 111, and the trace regions 112 are provided with signal traces. In order to ensure the area of the routing area 112, the width of the first slot 111 should not be too large, so long as the first bending area 110 can be separated along the second axis direction.

In some embodiments, referring to fig. 6, a display panel includes: a substrate 113, and respective film structures disposed on the display panel. The substrate 113 may be a PI (polyimide) layer. Specifically, the trace portion 100 may include: a back film 110 (BF) disposed on a first surface side of the substrate 113, a dielectric layer 114 (which may include an interlayer insulating layer ILD, gate insulating layers GI1, GI2, a buffer layer barrer, etc.), a signal trace layer 116 (e.g., a source drain electrode layer SD), etc. disposed on a second surface side of the substrate 113.

Optionally, in some embodiments, the trace 100 includes at least one second slot 130, where the second slot 130 is located in the second bending region; the second slot 130 penetrates the back film 110 in the thickness direction of the trace portion 100, and the extending direction of the second slot 130 is parallel and perpendicular to the second axis. Referring to fig. 5, in the second inflection region, a portion of the backing film 110 material may be removed except for the region overlapping the first inflection region 110, forming a second slot 130 extending in a second direction (parallel to the second axis, see vertical in fig. 1). It will be appreciated that the second slot 130 is located in a region where bending about the first axis does not occur, but bending about the second axis occurs. In this embodiment, by forming the second slot 130 on the back film 110, the bending path of the trace portion 100 can be fixed when bending around the second axis, and the stress generated by bending can be released. It can be understood that in the present embodiment, the back film 110 plays a role of protecting the substrate 113, and the wiring portion 100 is bent to the first surface side of the display portion 200, and no signal wiring is provided on the back film 110 side, so that the functional characteristics of the display panel are not affected.

In some embodiments, the second slots 130 are in one-to-one correspondence with the first slots 111. Referring to fig. 2, the first grooves 111 overlap with the central axes of the corresponding second grooves 130, that is, the second grooves 130 are located in the extending direction of the first grooves 111, so that the bending path of the trace 100 can be better defined, and the trace is prevented from twisting when bending around the second reel.

In some embodiments, the trace portion 100 includes at least one third opening, and the third opening is located in the second bending region; the third opening penetrates through the dielectric layer 114 in the thickness direction of the wiring part 100, and the extending direction of the second slot 130 is parallel and perpendicular to the second axis; a stress release part is arranged in the third opening; the equivalent elastic modulus of the stress relief portion is less than the equivalent elastic modulus of the dielectric layer 114. In this embodiment, by providing the stress relief portion in the dielectric layer 114, the bending resistance of the trace portion 100 is improved, so as to prevent the signal trace layer 116 from being affected during bending, and to prevent the signal trace from being broken.

In some embodiments, referring to fig. 6, the orthographic projection of the third opening on the substrate overlaps the orthographic projection of the second slot on the substrate, so that the stress release portion and the second slot can define a path for the curling and bending of the trace portion and release the stress better, and ensure the quality of the trace portion in the curling process.

In some embodiments, the material of the dielectric layer 114 includes an inorganic material; the material of the stress relief portion comprises an organic material. Specifically, the dielectric layer 114 may include a buffer layer, a gate insulating layer, an interlayer insulating layer, and the like. Most of the dielectric layers 114 are made of inorganic materials, which have high elastic modulus and poor bending resistance. The organic material has higher bending resistance than the inorganic material, and is more suitable for bending of the trace portion 100.

In some embodiments, the display panel further includes: a planarization layer 115 (PLN 1) disposed on a side of the dielectric layer 114 facing away from the substrate 113; the planarization layer 115 and the stress relief portion are integrally formed. The material of the planarization layer 115 generally includes an organic material, in this embodiment, a portion of the dielectric layer 114 may be etched directly to form a third opening, and then the organic planarization layer 115 is formed on the substrate layer formed with the third opening, and the material of the organic planarization layer 115 covers the third opening while forming the planarization layer 115 to form a stress relief portion therein.

In some embodiments, the display panel further includes: and a protective layer 117 disposed on a side of the signal trace layer 116 facing away from the substrate. The protective layer 117 may include a planarization layer PLN2, a pixel defining layer PDL, a spacer layer PS, and the like.

In another aspect, the present embodiment provides a display device including: any one of the display panels described above. In this embodiment, the display panel is a flexible display panel, and may specifically be a folded display panel, or may also be a roll display panel.

When the display panel is a folded display panel, the fold line of the display panel may overlap the second axis.

In some embodiments, the display panel comprises a slider display panel. At this time, the display device may further include: the sliding scroll is arranged on the first surface side of the display panel and is parallel to the second axis.

Referring to fig. 1, in the present embodiment, a display portion 200 of a display panel may include a first display portion 220 and a second display portion 210. The first display unit 220 may be used to implement a flat display, and the second display unit 210 may be used to implement a scrolling display. The second display part 210 may be located at one side or both sides of the first display part 220, thereby implementing one-side curl display or two-side curl display.

It will be appreciated that when the display panel is a double-sided curled display, the number of the second bending regions should also be two, and the specific structure of the display panel is consistent with the principle of single-sided curled display, which will not be described in detail in this embodiment.

In some embodiments, referring to fig. 4, the spool has a first end 500 corresponding to the first inflection region 110; the shape of the first end 500 includes a regular polygonal prism structure; the edge 510 of the prismatic structure corresponds to the first slot 111. In the trace portion 100 of the display panel, the second bending region can slide along with the rotation of the slide roller. It will be appreciated that, during the rolling process, the first end 500 corresponds to the first bending region 110, and by setting the first end 500 to be a prismatic structure, the side edge of the prismatic structure corresponds to the routing region 112 of the routing portion 100, so that during the rolling process, the non-slotting region (the routing region 112 of the first bending region 110) can be attached to the rolling spool without bending, thereby ensuring the stability of the signal routing.

In some implementations, the spacing of adjacent two first slots 111 is no greater than the prism structure side width. At this time, the width of the trace region 112 (non-grooved region) and the side of the prism may achieve the first correspondence. Specifically, the sum of the pitch of two adjacent first grooves 111 and the width of one groove may be equal to the width of the side edge of the prism structure, or the width of the side edge of the prism structure may be an integer multiple of the sum of the pitch of two adjacent first grooves 111 and the width of one groove, so that the display panel may be well bonded to the side edge of the first end 500 during the crimping process.

For the dual side-scrolling display mode, in the prior art, if the signal routing part is disposed On the short side of the display part 200, the connection area 120 is at the scrolling end with FPC (Flexible Printed Circuit; flexible circuit board) and COF (Chip On Flex, or Chip On Film; flip Film), and there is a very high risk of the connection area 120 being used with repeated sliding of the scrolling display panel; if the trace portion is disposed on the long side of the display portion 200, after the flexible display panel is bent, the trace bending area of the trace portion may form an arc structure, and dead bending occurs during the sliding and curling process, so that the trace is broken.

In the display device provided in the embodiment, the first bending region 110 of the trace portion 100 of the display panel may be bent around the first axis, and then the second bending region of the trace portion 100 may be bent around the second axis (refer to the center line of the spool). Because the overlapping area of the first bending area 110 and the second bending area is provided with the first slot 111, after the wire-moving portion 100 is bent for the first time, the first slot 111 divides the wire-moving portion 100 into a plurality of wire-moving areas 112, the extending direction of the first slot 111 and the extending direction of the wire-moving areas 112 are parallel to the second axis, when the wire-moving portion 100 is bent around the second axis, and when the display panel is curled and displayed, the first slot 111 can define a bending path for the first bending area in the bending process and plays a role of releasing stress, thereby avoiding dead bending of the first bending area 110. Meanwhile, since the trace portion 100 is not disposed at the reel changing end of the display panel, the influence of the repeated sliding use of the display panel on the connection area 120 can be avoided.

The display device provided in this embodiment may be any product or component with a display function, such as an Organic Light Emitting Diode (OLED) display panel, electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc.

It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims

1. A display panel, comprising: a display part and a wiring part; the wiring part is positioned in the peripheral area of the display part; the wiring part is characterized by comprising: a first inflection region and a second inflection region;

the wiring part positioned in the first bending region can be bent to the first surface side of the display part around a first axis;

the wiring part positioned in the second bending region can be bent to the first surface side of the display part around a second axis;

the first axis intersects the second axis, and the first inflection region overlaps the second inflection region;

the wiring part comprises at least one first slot, and the first slot is positioned in the overlapping area of the first bending area and the second bending area; the first slot penetrates through the wire routing part in the thickness direction of the wire routing part, and the extending direction of the first slot is parallel to the second axis.

2. The display panel of claim 1, wherein the number of first slots comprises a plurality;

3. The display panel of claim 2, wherein the first slot has an extension equal to a dimension of the first bending region in a direction parallel to the second axis.

4. The display panel according to claim 1, wherein the wiring portion includes:

a substrate;

a back film disposed on a first side of the substrate;

the dielectric layer is arranged on the second surface side of the substrate;

5. The display panel according to claim 4, wherein the trace portion includes at least one second slot, the second slot being located in the second bending region; the second slot penetrates through the back film in the thickness direction of the wiring part, and the extending direction of the second slot is parallel to the second axis.

6. The display panel of claim 5, wherein the second slots are in one-to-one correspondence with the first slots.

7. The display panel according to claim 5, wherein the trace portion includes at least one third opening, the third opening being located in the second bending region; the third opening penetrates through the dielectric layer in the thickness direction of the wiring part, and the second slotting extending direction is parallel to the second axis;

8. The display panel of claim 7, wherein the material of the dielectric layer comprises an inorganic material; the material of the stress relief portion comprises an organic material.

9. The display panel of claim 7, further comprising: the flattening layer is arranged on one side of the dielectric layer, which is away from the substrate;

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

11. The display device of claim 10, wherein the display panel comprises a slider display panel;

the roll display panel is roll-able about a second axis.

12. The display device according to claim 11, further comprising:

the spool having a first end (500) corresponding to the first inflection zone; the shape of the first end (500) comprises a regular polygonal prismatic structure;

the edge of the prismatic structure corresponds to the first slot.

13. The display device of claim 12, wherein a pitch of two adjacent first slots is no greater than a side width of the prismatic structure.