CN115064078A

CN115064078A - Display panel, preparation method of display panel and display device

Info

Publication number: CN115064078A
Application number: CN202210787881.0A
Authority: CN
Inventors: 韩永强
Original assignee: Wuhan Tianma Microelectronics Co Ltd
Current assignee: Wuhan Tianma Microelectronics Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2022-09-16
Anticipated expiration: 2042-07-04
Also published as: CN115064078B

Abstract

The embodiment of the application provides a display panel, a preparation method of the display panel and a display device, wherein the display panel comprises a plane area and a bending area, and the display panel comprises a flexible substrate, a first supporting body and a second supporting body; the flexible substrate comprises a first area, a second area and a third area connecting the first area and the second area; the first support body is arranged in the first area of the flexible substrate, the second support body is arranged in the second area of the flexible substrate, and the first support body and the second support body are used for supporting and protecting the flexible substrate; when the third region is bent to enable the second region of the flexible base material to be reversely bent to at least partially overlap with the first region, the second support body comprises a first part located in the bent region; the modulus of the second support body is greater than that of the first support body, so that the second support body can maintain the profiling shape after yielding deformation, and the profiling effect is better; the display panel that this application can solve and lead to because of supporter profile modeling differs with the design warp, shows uneven problem.

Description

Display panel, preparation method of display panel and display device

[ technical field ] A method for producing a semiconductor device

The present disclosure relates to the field of display technologies, and in particular, to a display panel, a manufacturing method of the display panel, and a display device.

[ background ] A method for producing a semiconductor device

With the continuous development of display technologies, flexible display technologies have gained more and more attention, and therefore, people have made higher demands on the display performance of flexible display panels.

In the prior art, multi-curved screen displays have been implemented. The realization of the multi-curved-surface screen display panel solves the problem that the display panel has visual effect difference when a user watches the screen from the side. However, in actual production and life, it is found that when a display panel with a multi-curved-surface screen works, the curved surface of the display panel deforms, so that the display panel has the phenomena of visual effect difference and display unevenness, and the display effect of the display panel is affected.

[ contents of application ]

In view of this, embodiments of the present application provide a display panel, a method for manufacturing the display panel, and a display device.

In a first aspect, the present application provides a display panel, including a planar region and a bending region; the display panel includes:

a flexible substrate comprising a first region, a second region, and a third region connecting the first region and the second region;

a first support disposed at the first region of the flexible substrate;

a second support disposed in the second region of the flexible substrate;

wherein the third region is bent such that when the second region of the flexible substrate is folded back to at least partially overlap the first region, the second support comprises a first portion located in the bend region; the modulus of the second support is greater than the modulus of the first support.

In one implementation form of the first aspect, the display panel further comprises a display device disposed on one side of the flexible substrate;

the first supporting body and the second supporting body are arranged on one side, far away from the display device, of the flexible base material.

In one implementation form of the first aspect, the display panel further comprises a planar area; when the second region of the flexible substrate is inverted to at least partially overlap the first region, the second support further comprises a second portion in the planar zone;

and a chip or a flexible printed circuit board is bound in the area of the second part arranged on the flexible substrate.

In one implementation of the first aspect, the first support comprises a portion located at the inflection zone;

the first support body covers the plane area, and the second support body overlaps with partial area of the plane area.

In one implementation form of the first aspect, the modulus of the second support is 2GPa to 300 GPa.

In one implementation manner of the first aspect, the material of the second support body is at least one of a metal and an alloy material.

In one implementation manner of the first aspect, the first support is one of PET and acryl.

In one implementation manner of the first aspect, the second support body is retracted 0-0.05 mm relative to the first support body.

In a second aspect, the present application provides a method for manufacturing a display panel, which is used for manufacturing the display panel provided in the first aspect; the method comprises the following steps:

providing a flexible substrate comprising a first region and a second region;

providing a first support disposed in the first region of the flexible substrate;

providing a second support disposed in the second region of the flexible substrate;

folding back the second region of the flexible substrate to at least partially overlap the first region, the second support comprising a first portion located in the fold region.

In one implementation of the second aspect, the method further comprises, prior to folding back the second region of the flexible substrate to at least partially overlap the first region:

profiling the second support body so that the shape of the first portion in the profiled second support body is the same as a preset shape.

In a third aspect, the present application provides a display device comprising the display panel as provided in the first aspect.

According to the display panel, the preparation method of the display panel and the display device, the modulus of the second support body is increased, the profiling jig is used for profiling the second support body before the flexible substrate is bent, the second support body can be subjected to yielding deformation, the shape of the first part in the second support body is the same as the preset shape, and the process precision is consistent with the design; the phenomenon of resilience of the second support body due to small modulus is avoided, the problem of profile modeling abnormity caused by material characteristics and a manufacturing process is solved, the display performance of the display panel is improved, and normal display of the display panel is realized.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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

FIG. 2 is a cross-sectional view of the display panel of FIG. 1 taken along the direction MN;

FIG. 3 is an enlarged view of a portion I of FIG. 2;

FIG. 4 is a partially enlarged view of the first and second supporting bodies shown in FIG. 3;

FIG. 5 is a plan view of a display panel according to an embodiment of the present invention;

fig. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention;

fig. 7 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention;

fig. 8 is a schematic diagram of a display device according to an embodiment of the invention.

[ detailed description ] A

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all 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 application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description herein, it is to be understood that the terms "substantially", "approximately", "about", "approximately", "substantially" and the like in the claims and the examples are intended to be inclusive and mean that the term "substantially" may be interpreted as an alternative to an exact value within a reasonable process operating range or tolerance.

It should be understood that although the terms first, second, etc. may be used in the embodiments of the present application to describe a support, a region, etc., these support, region, etc. should not be limited by these terms. These terms are only used to distinguish supports, regions, etc. from one another. For example, the first support may also be referred to as a second support, and similarly, the second support may also be referred to as a first support, without departing from the scope of the embodiments of the present application.

The applicant provides a solution to the problems of the prior art through intensive research.

Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention, and fig. 2 is a cross-sectional view of the display panel shown in fig. 1 along a direction MN.

As shown in fig. 1 and fig. 2, the display panel 100 according to the embodiment of the invention includes a planar area PA and a bending area BA.

Specifically, the flat area PA is a display area of the display panel 100 that realizes a main display function and generally has a light emitting surface facing the upper surface of the display panel 100, and the bending area BA is an area having a certain bending angle with respect to the flat area PA and generally serves as a side surface of the display panel 100. That is, as shown in fig. 2, the normal direction X of the light-emitting surface of the bending area BA intersects with the normal direction Y of the light-emitting surface of the planar area PA.

Fig. 3 is a partially enlarged view of a portion I in fig. 2. Fig. 4 is a partially enlarged view of the first supporting body and the second supporting body in fig. 3.

As shown in fig. 3, the display panel 100 according to the embodiment of the invention includes a flexible substrate 10, a first support 11 and a second support 12.

The flexible substrate 10 includes a first region 01, a second region 02, and a third region 03 connecting the first region 01 and the second region 02.

The first support 11 is disposed in a first region 01 of the flexible substrate 10; for supporting the first region 01 of the flexible substrate 10.

The second support 12 is disposed in the second region 02 of the flexible substrate 10; for supporting the second region 02 of the flexible substrate 10.

When the third region 03 is bent to fold the second region 02 of the flexible substrate 10 back to at least partially overlap the first region 01, as shown in fig. 4, the second support 12 includes a first portion 121 located in the bending region BA, and the second support 12 further includes a second portion 122 located in the planar region PA, and the modulus of the second support 12 is greater than that of the first support 11.

The inventor analyzes the display panel 100 and the working process thereof, and finds that the first support 11 disposed in the first region 01 of the flexible substrate 10 and the second support 12 disposed in the second region 02 of the flexible substrate 10 are made of the same material, the modulus of the first support 11 and the modulus of the second support 12 are the same, and the yield deformation capability is the same. Due to the flexibility of the stacked materials between the first support 11 and the second support 12 of the display panel 100 and the modulus limitations of the first support 11 and the second support 12, the first portion 121 of the second support 12 located in the bending area BA tends to be straight, which causes the appearance and design of the display panel 100 to be poor and the process accuracy and design to be inconsistent, so that the display panel 100 is prone to deformation and other problems, and the normal display of the display panel 100 is seriously affected.

Based on the above problems and the analysis of the cause of the above problems, in the present embodiment, the modulus of the second support 12 is set to be greater than the modulus of the first support 11, so that the profiling effect can be maintained after the yield deformation of the second support 12, the problem of abnormal profiling of the display panel 100 caused by stress rebound is reduced, the display performance of the display panel 100 is improved, and the normal display of the display panel 100 is realized. In addition, for convenience of manufacturing and realizing the display panel 100, the first support 11 may be made of a material in the prior art, and the second support 12 may be made of a material having a modulus greater than that of the first support 11.

Optionally. The first support 11 is one of PET and acryl. Wherein the PET is Polyethylene terephthalate (PET). The first support 11 is made of PET or acryl material having high flexibility, so that the impact resistance of the flexible display panel 100 can be improved, and the flexible substrate 10 can be prevented from being damaged by an external force.

Optionally, the material of the second support 12 is at least one of a metal and an alloy material.

The modulus of the metal and alloy materials is larger than that of PET and acrylic, and the metal and alloy materials are not easy to rebound after yield deformation, so that the metal and alloy materials have better profiling effect.

As shown in fig. 3, in one embodiment of the present application, the display panel 100 further includes a display device 14, and the display device 14 is disposed on one side of the flexible substrate 10. The display device 14 provided in the display panel 100 is for realizing a display function of the display panel 100.

When the third region 03 is not bent, the first support 11 and the second support 12 are both disposed on a side of the flexible substrate 10 away from the display device 14. That is, as shown in fig. 3, when the third region 03 is bent, both the first support 11 and the second support 12 may be located inside the flexible base 10.

In the embodiment of the present application, the first supporting body 11 and the second supporting body 12 are disposed on the inner side of the flexible substrate 10 when bending, so as to reduce the width of the bending area BA, and make the frame of the display panel 100 narrower.

In one embodiment of the present application, as shown in fig. 1 and 4, the display panel 100 further includes a planar area PA. When the second region 02 of the flexible substrate 10 is folded back to at least partially overlap the first region 01, the second support 12 further comprises a second portion 122 located in the planar area PA; and a chip or a flexible printed circuit board is bound to the region of the flexible substrate 10 where the second portion 122 is disposed.

In the embodiment of the present application, the second portion 122 of the second support 12 is relatively flat, and the area of the flexible substrate 10 where the second portion 122 is disposed may be relatively flat. A chip or a flexible printed circuit board is bound to the region where the second portion 122 is disposed on the flexible substrate 10, which is beneficial to ensuring the stability of the chip or the flexible printed circuit board and preventing the chip or the flexible printed circuit board from deforming. In addition, the chip or the flexible printed circuit board is bound to the second portion 122 of the flexible substrate 10 that can be folded back, which is beneficial to saving space resources of the display panel 100.

In the embodiment of the present application, the second supporting body 12 may be made of metal or alloy, and since the thermal conductivity of the metal or alloy is high, the chip or the flexible printed circuit board is bonded in the region where the second portion 122 is disposed on the flexible substrate 10, so that the heat generated by the chip or the flexible printed circuit board can be effectively conducted, and the problem of local heat generation of the chip or the flexible printed circuit board is solved.

Further, with continued reference to fig. 4, the first supporting body 11 includes a portion located in the bending area BA, and the first supporting body 11 covers the planar area PA, and the second supporting body 12 overlaps with a partial area of the planar area PA. I.e. in the direction Y of the normal to the plane area PA, the projection of the first support 11 covers the projection of the plane area PA, and the projection of the second support 12 overlaps the projection of a partial area of the plane area PA.

It is understood that the portion of the second support 12 overlapping with the partial area of the planar area PA may be the second portion 122 of the second support 12 located in the planar area PA.

In the embodiment of the present application, as shown in fig. 4, a part of the first support 11 is located in the bending area BA, and another part is located in the planar area PA and covers the planar area PA; the first support body 11 can support and protect both the bending area BA and the planar area PA in the display panel 100, so that the display panel 100 is not easy to deform, and the display performance of the display panel 100 is improved.

In addition, the second supporting body 12 overlaps with a partial area of the planar area PA, that is, the second supporting body 12 includes the second portion 122 located in the planar area PA, so that the area on the flexible substrate 10 where the second portion 122 is located can be relatively flat, and when the chip or the flexible printed circuit board is bound in the area on the flexible substrate 10 where the second portion 122 is located, the stability of the chip or the flexible printed circuit board can be ensured, and the chip or the flexible printed circuit board is prevented from being deformed.

In one embodiment of the present application, the modulus of the second support 12 may range from 2GPa to 300GPa, where modulus refers to the ratio of stress to strain of a material under stress.

The second supporting body 12 can be made of a material with a modulus within the above range, so that it is ensured that the second supporting body 12 is not easy to rebound after yielding deformation, and a good profiling effect is achieved, thereby avoiding the problem of abnormal profiling of the display panel 100.

Fig. 5 is a plan view of a display panel according to an embodiment of the invention.

As shown in FIG. 5, in one embodiment of the present application, the second support 12 is retracted 0-0.05 mm relative to the first support 11.

Specifically, as shown in fig. 5, along the first direction Z, the second supporting body 12 is inwardly retracted relative to the first supporting body 11, the retracted length is d1, and 0 < d1 is less than or equal to 0.05 mm. The first direction Z may intersect with the arrangement direction of the first support 11 and the second support 12 when not bent.

In this technical scheme, set up second supporter 12 and contract 0.05mm for first supporter 11 is interior for display panel 100 can go on smoothly when the cutting and do not damage second supporter 12, and then avoided appearing the problem of warping because of destroying display panel 100 that second supporter 12 leads to.

Fig. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention.

As shown in fig. 6, an embodiment of the present invention provides a method for manufacturing a display panel 100, and the method can be used to manufacture the display panel 100 provided in any one of the above embodiments. The following describes the steps of the method for manufacturing the display panel 100 with reference to fig. 3 and 6:

step S1, a flexible substrate 10 is provided.

In this step, the flexible substrate 10 is provided to include a first region 01, a second region 02, and a third region 03, and the first region 01 is connected to the second region 02 via the third region 03.

In step S2, the first support 11 is provided.

In this step, the first support 11 is provided at the first region 01 of the flexible substrate 10, and the first support 11 is used to support the first region 01 of the flexible substrate 10.

Step S3, a second support 12 is provided.

In this step, the second support 12 is disposed in the second region 02 of the flexible substrate 10, and the second support 12 is used to support the second region 02 of the flexible substrate 10.

In step S4, the second region 02 of the flexible substrate 10 is folded back to at least partially overlap the first region 01.

In this step, as shown in fig. 3 and 6, the second region 02 of the flexible substrate 10 is bent toward the first region 01, so that the second region 02 of the flexible substrate 10 is at least partially overlapped with the first region 01 after being bent. At this time, as shown in fig. 4, the second supporter 12 includes a first portion 121 located at the bending area BA.

By the above manufacturing method, the display panel 100 provided in any one of the above embodiments can be manufactured. In the above manufacturing method, the first support 11 may be made of a PET material or an acrylic material having a relatively low modulus and a relatively high flexibility, and the second support 12 may be made of a metal material or an alloy material having a relatively high modulus and a relatively low flexibility. Disposing a first support 11 on a first region 01 of a flexible substrate 10; the first support 11 functions to support and protect the first region 01 of the flexible substrate 10. Disposing a second support 12 in a second region 02 of the flexible substrate 10; the second support 12 functions to support and protect the second region 02 of the flexible substrate 10. The second region 02 of the flexible substrate 10 is folded back to be at least partially overlapped with the first region 01, so as to complete the bending action of the flexible substrate 10, thereby realizing the preparation of the display panel 100 provided by the embodiment of the invention.

Fig. 7 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention.

As shown in fig. 7, in an embodiment of the present application, before the second region 02 of the flexible substrate 10 is folded back to at least partially overlap with the first region 01, that is, before performing step S4 shown in fig. 6, the method for manufacturing the display panel 100 further includes:

step S3A: the second support 12 is contoured such that the shape of the first portion 121 in the contoured second support 12 is the same as the predetermined shape.

In the embodiment of the present application, the profiling jig 13 is used to perform yielding deformation on the second supporting body 12 with a large modulus, so as to complete profiling work on the second supporting body 12, so that the shape of the first portion 121 in the profiled second supporting body 12 is the same as the preset shape, and the problem of deformation of the display panel 100 caused by the difference between the shape of the first portion 121 in the second supporting body 12 and the preset shape is avoided. It can be understood that, when the profiling is performed on the second support 12 with a larger amount, not only can the shape of the first portion 121 in the profiled second support 12 be the same as the preset shape, but also the profiling effect of the second support 12 can be maintained, and the abnormal problem of profiling of the flexible substrate 10 caused by the stress rebound can be avoided.

Fig. 8 is a schematic diagram of a display device according to an embodiment of the disclosure.

As shown in fig. 8, an embodiment of the present application further provides a display device, including the display panel 100 and the housing 200 provided in the above embodiments, where the housing 200 forms an accommodating space for accommodating the display panel 100, and the housing 200 may be rigid or flexible, which is not limited in this respect. It can be understood that the display device provided in the embodiment of the present invention may be a display device with a display function, such as a computer, a television, a vehicle, a wearable device, and an artificial intelligence, and the present invention is not limited thereto.

According to the display device provided by the embodiment of the invention, by increasing the modulus of the second support body 12 and profiling the second support body 12 by using the profiling jig before the flexible substrate 10 is bent, the second support body 12 can be subjected to yielding deformation, the shape of the first part 121 in the second support body 12 is the same as the preset shape, and the process precision is consistent with the design; the phenomenon of resilience of the second support 12 due to small modulus is avoided, the problem of abnormal profiling caused by material characteristics and manufacturing process is solved, the display performance of the display panel 100 is improved, and the normal display of the display panel 100 is realized.

The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A display panel is characterized by comprising a plane area and a bending area; the display panel includes:

a first support disposed at the first region of the flexible substrate;

a second support disposed in the second region of the flexible substrate;

2. The display panel according to claim 1, further comprising a display device provided on one side of the flexible substrate;

3. The display panel according to claim 1, wherein the display panel further comprises a planar area; when the second region of the flexible substrate is inverted to at least partially overlap the first region, the second support further comprises a second portion in the planar zone;

4. The display panel according to claim 3, wherein the first support body includes a portion located at the bending region;

5. The display panel according to claim 1, wherein the modulus of the second support is 2GPa to 300 GPa.

6. The display panel according to claim 5, wherein the material of the second support is at least one of a metal and an alloy material.

7. The display panel according to claim 6, wherein the first support is one of PET and acryl.

8. The display panel according to claim 1, wherein the second support is retracted 0 to 0.05mm relative to the first support.

9. A method for producing a display panel, characterized by producing the display panel according to any one of claims 1 to 8; the method comprises the following steps:

providing a flexible substrate comprising a first region and a second region;

10. The method of manufacturing of claim 9, wherein the second region of the flexible substrate is reverse folded to at least partially overlap the first region, the method further comprising:

11. A display device characterized by comprising the display panel according to any one of claims 1 to 9.