CN108628500B

CN108628500B - Display panel

Info

Publication number: CN108628500B
Application number: CN201810791579.6A
Authority: CN
Inventors: 李岩松; 朱昆鹏
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2018-07-18
Filing date: 2018-07-18
Publication date: 2023-08-18
Anticipated expiration: 2038-07-18
Also published as: CN108628500A

Abstract

The present application relates to a display panel. The display panel includes a flexible screen body and a support layer. The flexible screen body comprises a display area, a bending area and an extension area which are sequentially arranged. A first surface and a second surface disposed opposite each other. The flexible screen body is bent towards the first surface, and the display area and the extension area are arranged in parallel. The supporting layer is attached to the first surface, and the hardness of the supporting layer located in the bending area is smaller than that of the supporting layer located in the display area and the extending area. The bending stress of the flexible screen body positioned in the bending area can be reduced, and further the flexible screen body can be prevented from being damaged due to deformation. And in the display area and the extension area, the hardness of the supporting layer is larger, so that the strength of the flexible screen body can be ensured, and the service life of the flexible screen body can be prolonged.

Description

Display panel

Technical Field

The present application relates to the field of display, and in particular, to a display panel.

Background

With more and more flexible screen bodies, the phenomenon of poor display of the screen bodies caused by folding the flexible screen bodies is more and more. The stress generated after the flexible screen body is folded influences the reliability of the display module structure. In order to ensure the stiffness and the protection effect of the flexible screen body, a support film is often required to be attached to the back surface of the flexible screen body. But the flexible screen body and the support film can be folded to generate larger bending stress, so that the flexible screen is easy to damage.

Disclosure of Invention

Accordingly, it is necessary to provide a display panel for the problem that a large bending stress is generated when the flexible screen body and the support film are folded.

A display panel, comprising:

a flexible screen, the flexible screen comprising:

the display area, the bending area and the extension area are sequentially arranged;

the flexible screen body is bent towards the first surface, and the display area and the extension area are arranged in parallel;

the supporting layer is attached to the first surface, and the hardness of the supporting layer located in the bending area is smaller than that of the supporting layer located in the display area and the extending area.

In one embodiment, the support layer comprises:

the first support film is attached to the first surface and is positioned in the display area, the bending area and the extension area;

the second support film is attached to one side, far away from the first surface, of the first support film and is located in the display area, the bending area and the extension area, and the thickness of the first support film in the bending area is smaller than that of the first support film in the display area and the extension area.

In one embodiment, a gap is formed between the first support film and the second support film at the inflection region.

In one embodiment, the second support film is attached to the first support film by an adhesive.

In one embodiment, a portion of the second support film adjacent to the bending region is provided with a reinforcing portion for reinforcing the strength of the bending region.

In one embodiment, the width of the cross section of the reinforcement portion gradually decreases from the second support film to the bending region.

In one embodiment, a plurality of grooves are formed in the first support film at a side of the bending region away from the first surface at intervals.

In one embodiment, the spacing between the plurality of grooves decreases gradually from both ends of the inflection region to the middle of the inflection region.

In one embodiment, the grooves are tapered in configuration.

In one embodiment, the thickness of the first support film is 20 μm to 30 μm in the display region and the extension region. In the bending region, the thickness of the first support film is 10 μm, and the thickness of the second support film is 70 μm-100 μm.

In one embodiment, the display device further comprises a support body disposed between the second support film located in the display area and the second support film located in the extension area.

In one embodiment, the support layer comprises:

the two third support films are attached to the first surface and are respectively positioned in the display area and the extension area;

a fourth support film attached to a side of the third support film away from the first surface in the display area and the extension area; in the bending area, the fourth support film is attached to the first surface.

Drawings

FIG. 1 is a schematic diagram of a display panel according to an embodiment of the present application;

FIG. 2 is a partial view of a display panel according to an embodiment of the present application;

fig. 3 is a schematic view of a display panel according to another embodiment of the application.

Description of the reference numerals

Display panel 10

Flexible screen 100

Display area 110

Inflection region 120

Groove 121

Extension region 130

First surface 140

Second surface 150

Support layer 200

First support film 210

Second support film 220

Reinforcing part 230

Extension 221

Third support film 240

Fourth support film 250

Support 300

Composite glue layer 400

Cover layer 500

Touch sensing layer 510

Polarizer 520

Cover plate 530

Ink layer 540

First adhesive layer 550

Second adhesive layer 560

The drive unit 610

Flexible circuit board 620

Gap 700

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the following embodiments are used to further describe the display panel of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Referring to fig. 1, a display panel 10 is provided according to an embodiment of the application. The display panel 10 includes a flexible screen body 100 and a support layer 200. The flexible screen body 100 includes a display area 110, a bending area 120 and an extension area 130, which are sequentially arranged. The flexible screen 100 further includes a first surface 140 and a second surface 150 disposed opposite each other. The flexible screen 100 is curved toward the first surface 140. The display area 110 and the extension area 130 are disposed in parallel. The supporting layer 200 is adhered to the first surface 140. The hardness of the support layer 200 at the inflection region 120 is less than the hardness of the support layer 200 at the display region 110 and the extension region 130.

The flexible screen 100 may have a flexible substrate. The flexible substrate may have a display driving circuit, an array of light emitting diodes, and the like. The flexible screen 100 may be an OLED display. The flexible screen body 100 may be bent along a certain direction, or may be bent along a plurality of directions at the same time. The display area 110 may be used to display a pattern. It is understood that the periphery of the display area 110 may have a bezel. The bezel may serve as the non-display area 110. When the display panel 10 is a full screen display, the bezel may have a small width or no bezel.

The inflection zones 120 may be used to bend the flexible screen 100. The inflection zones 120 may not have a distinct demarcation line. The size and bend radius of the inflection region 120 may be flexibly changed. In one embodiment, the base material of the inflection region 120 is more flexible than the materials of the display region 110 and the extension region 130. The extension 130 may be used to provide a circuit device. A display pattern is visible in the display area 110 of the second surface 150. The first surface 140 may be understood as a surface on the side where the pattern is not displayed. The first surface 140 and the second surface 150 may be configured to support the flexible screen 100 at the first surface 140. The flexible screen 100 may be configured in a U-shaped configuration after being bent. Inside the U-shaped structure may be the first surface 140. Outside the U-shaped structure is the second surface 150. The parallel arrangement of the extension area 130 and the display area 110 may enable the display panel 10 to have a plate-like structure, and facilitate the fixation of the flexible screen 100.

The support layer 200 may be used to support the flexible screen 100 after bending, so as to prevent the flexible screen 100 from being damaged by external pressure. In one embodiment, the supporting layer 200 may be formed by designing a mold such that the thickness of the supporting layer 200 in the bending region 120 is smaller than the thickness of the supporting layer 200 in the display region 110 and the extension region 130. The thickness of the support layer 200 located in the display region 110 may be different from the thickness of the support layer 200 of the extension region 130. That is, the thickness of the support layer 200 of the display region 110 and the thickness of the support layer 200 of the extension region 130 may be differently set according to the structure of the inside of the display panel 10. The stiffness of the support layer 200 of the inflection zone 120 is set to be the smallest location of the flexible screen 100.

When the flexible screen body 100 is bent, the bending region 120 is used as a bending portion, bending stress is generated, and the greater the hardness of the flexible screen body 100 of the bending region 120 is, the greater the tension of the surface of the flexible screen body 100 facing away from the bending direction is. And the surface compression stress of the flexible screen body 100 in the bending direction is large. The flexible screen 100 is thus easily damaged. By making the hardness of the supporting layer 200 of the bending region 120 smaller than the hardness of the supporting layer 200 of the display region 110 and the extension region 130, the bending stress of the flexible screen body 100 located in the bending region 120 can be reduced, and thus the flexible screen body 100 can be prevented from being damaged due to deformation. And in the display area 110 and the extension area 130, the support layer 200 has a relatively high hardness, so that the strength of the flexible screen 100 can be ensured, and thus the life of the flexible screen 100 can be prolonged.

In one embodiment, the support layer 200 includes a first support film 210 and a second support film 220. The first supporting film 210 is attached to the first surface 140 and located in the display area 110, the bending area 120 and the extension area 130. The second supporting film 220 is attached to a side of the first supporting film 210 away from the first surface 140, and is located in the display area 110, the bending area 120 and the extension area 130. The thickness of the first support film 210 in the bending region 120 is smaller than that in the display region 110 and the extension region 130. Thus, the thickness of the first support film 210 and the second support film 220 superimposed on the inflection region 120 is smaller than the thickness of the first support film 210 and the second support film 220 superimposed on the display region 110 and the extension region 130. Therefore, in the inflection region 120, the hardness of the supporting layer 200 is smaller than that of the supporting layer 200 located in the display region 110 and the extension region 130. In one embodiment, a gap 700 is formed between the first support film 210 and the second support film 220 at the inflection region 120. Since the thickness of the first support film 210 in the bending region 120 is smaller than that in the display region 110 and the extension region 130, the first support film 210 cannot be completely adhered to the second support film 220 in the bending region 120. The gap 700 is formed between the first support film 210 and the second support film 220. The gap 700 may be filled with air. When the bending region 120 is bent, the resistance of air is small, so that bending of the bending region 120 can be facilitated. And bending stress is not easy to generate.

In one embodiment, the second support film 220 is attached to the first support film 210 by an adhesive. The binder may be synthetic resin, synthetic rubber, or the like. The second support film 220 and the first support film 210 are attached by the adhesive agent conveniently and simply, and the bonding effect is good.

In one embodiment, the material of the first support film 210 and the second support film 220 may be polyethylene terephthalate, polyimide film. The first support film 210 and the second support film 220 may have a certain hardness and toughness. In one embodiment, the first support film 210 may have a high strength, and the second support film 220 may have a certain elasticity. Therefore, the first support film 210 can ensure the strength of the flexible screen 100, and the second support film 220 can play a role of buffering when the flexible screen 100 receives an external impact force.

In one embodiment, a portion of the second support film 220 adjacent to the inflection region 120 is provided with a reinforcement portion 230 for reinforcing the strength of the inflection region 120. When the flexible screen body 100 located in the bending region 120 is bent into an arc shape, the pressure bearing capacity of two ends of the arc shape in the normal direction of the arc line is poor, and the reinforcing portion 230 may be abutted against two ends of the bending region 120, so that the strength of the bending region 120 of the flexible screen body 100 may be increased, and the position of the bending region 120 close to the display region 110 and the extension region 130 is prevented from being damaged due to the pressure bearing capacity difference.

In one embodiment, the width of the cross section of the reinforcement part 230 is gradually reduced from the second support film 220 to the bending region 120. It will be appreciated that the bending stress of the flexible screen body 100 and the first support film 210 at both ends of the bending region 120 is maximized. The bending stress gradually decreases from both ends of the bending region 120 to the arc top of the bending region 120. The gradual decrease in the width of the cross section of the reinforcement portion 230 can be adapted to the bending stress of the bending region 120, that is, the bending region 120 can be sufficiently reinforced, and the bending of the bending region 120 is not affected. While saving material.

Referring to fig. 2, in one embodiment, the reinforcement part 230 may be integrally formed with the second support film 220. The surface of the portion of the reinforcement part 230 contacting the first support film 210 may be curved. The arc shape may correspond to a curved surface of the flexible screen body 100 located at the bending region 120, so that the reinforcing part 230 is completely engaged with a portion of the first support film 210 to further reinforce the strength of the flexible screen body 100.

In one embodiment, a plurality of grooves 121 are disposed at intervals on a side of the first support film 210 located at the bending region 120 away from the first surface 140. The first support film 210 located at the bending region 120 may have an arc-shaped structure after being bent. After the first support film 210 located in the bending region 120 is bent, the substrate stress of the first support film 210 located in the bending region 120 away from the first surface 140 increases due to the extrusion stress. Maintaining the stress state for a long period of time may easily cause damage to the flexible screen 10. The plurality of grooves 121 disposed at intervals can reduce stress in the material of the first support film 210 in the bending region 120 when the bending region 120 is bent toward the first surface 140, so that stress accumulation can be reduced, and the life of the flexible screen 100 can be prolonged.

In one embodiment, the inflection zones 120 are located from both ends of the inflection zones 120 to the middle of the inflection zones 120. The intervals between the plurality of grooves 121 gradually decrease. Since the bending stress of the flexible screen body 100 and the first support film 210 at both ends of the bending region 120 is the greatest, the bending stress gradually decreases from both ends of the bending region 120 to the arc top of the bending region 120. Therefore, the density of the grooves 121 is designed according to the stress variation of the bending region 120, so that the grooves 121 can be designed more specifically. While avoiding excessive grooving affecting the structural strength of the first support film 210.

In one embodiment, the thickness of the first support film 210 is 20 μm to 30 μm in the display region 110 and the extension region 130. In the bending region 120, the thickness of the first support film 210 is 10 μm. And when the thickness is 10 μm, the thickness of the first supporting film 210 may be sufficient to support the bending of the flexible screen body 100 located at the bending region 120, and at the same time, an excessive bending stress is not caused, so that the life of the flexible screen body 100 can be ensured. The thickness of the second support film 220 is 70 μm to 80 μm. The second support film 220 has high strength at a thickness of 70 μm to 80 μm, and can prevent the display region 110 and the extension region 130 of the flexible screen body 10 from being damaged by external pressure. And the second supporting film 220 does not significantly increase the thickness of the display panel 10, which is advantageous for realizing a thin screen design of the display panel 10.

In one embodiment, the display panel 10 further includes a support 300 disposed between the second support films 220. The support 300 may be used to support the flexible screen 100 through the second support film 220, so as to ensure that the flexible screen 100 is not easily deformed. The support 300 may be a cube. The support 300 may be made of a material having a certain hardness and elasticity, such as silica gel. The two surfaces of the support body 300 contacting the two second support films 220 may be parallel surfaces.

In one embodiment, the display panel 10 further includes a composite adhesive layer 400 disposed between the second support film 220 and the support 300 adjacent to the display area 110. The composite glue layer 400 may be foam or a material with elasticity and toughness. It is understood that the area of the composite glue layer 400 may be greater than or equal to the area of the display area 110. The edges of the display area 110 can be buffered by the composite glue layer 400 when impacted. The composite glue layer 400 may prevent the display area 110 from being damaged by compression or local stress impact.

Referring to fig. 3, in one embodiment, the support layer 200 includes two third support films 240 and one fourth support film 250. The two third supporting films 240 are adhered to the first surface 140, and are respectively located in the display area 110 and the extension area 130. In the display area 110 and the extension area 130, the fourth support film 250 is attached to a side of the third support film 240 away from the first surface 140. In the bending region 120, the fourth supporting film 250 is attached to the first surface 140.

In this embodiment, the two third support films 240 are first laid on the first surface 140 of the flexible screen body 100 at intervals. The two third support films 240 may support the display region 110 and the extension region 130 of the flexible screen body 100, respectively. The fourth support film 250 is integrally laid on the surfaces of the two third support films 240 located in the display region 110 and the extension region 130, and the surface of the first surface 140 located in the bending region 120. Namely, in the display region 110 and the extension region 130, the third support film 240 and the fourth support film 250 are laminated. In the inflection zone 120, there is only a fourth support membrane 250. Therefore, the hardness of the supporting layer 200 located in the bending region 120 is smaller than the hardness of the supporting layer 200 located in the extension region 130 and the display region 110, so that bending of the bending region 120 is facilitated, and a large bending stress due to a thicker supporting layer 200 located in the bending region 120 is avoided. The position, near the bending region 120, where the third support film 240 contacts with the fourth support film 250 may be filled with an organic adhesive, so as to avoid occurrence of a gap, and further enhance the supporting force of the support layer 200 on the flexible screen body 100.

In one embodiment, the third support film 240 and the fourth support film 250 may be connected by a glue, so as to avoid loosening of the third support film 240 and the fourth support film 250.

In one embodiment, the display panel 10 further includes a cover layer 500. The cover layer 500 is disposed on the second surface 150. The overlay 500 may be used to optimize the display of the display area 110.

The cover layer 500 includes a touch sensing layer 510, a polarizer 520, and a cover 530 sequentially disposed in the display area 110 away from the supporting layer 200. The touch sensing layer 510 may be used as a touch signal input terminal. The display area 110 may trigger different display patterns according to the sensing signal of the touch sensing layer 510. The polarizer 520 may absorb part of the light to prevent the natural light from affecting the display. The cover 530 may be made of glass material or organic material. The cover 530 may be provided with an ink layer 540 on a side adjacent to the display area 110. The ink layer 540 may be used to block light to enhance display. The ink layer 540 may be formed on the surface of the cap plate 530 by coating.

In one embodiment, the ink layer 540 and the polarizer 520 may be fixed by a first adhesive layer 550. The touch sensing layer and the display area 110 may be fixed by a second adhesive layer 560. The first adhesive layer 550 and the second adhesive layer 560 may be made of an optical adhesive, an organic resin, or the like.

In one embodiment, the display panel 10 further includes a driving unit 610 and a flexible circuit board 620. The driving unit 610 and the flexible circuit board 620 are respectively disposed at intervals in the extension region 130. The driving unit 610 may be configured to receive a control model from a motherboard and input a signal to the flexible screen 100. The flexible circuit board 620 may be connected to a motherboard and provide power to the motherboard.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A display panel, comprising:

a flexible screen (100), the flexible screen (100) comprising:

the display area (110), the bending area (120) and the extension area (130) are sequentially arranged;

-a first surface (140) and a second surface (150) arranged opposite each other, the flexible screen (100) being curved towards the first surface (140), the display area (110) and the extension area (130) being arranged in parallel;

a supporting layer (200) attached to the first surface (140), wherein the supporting layer (200) located in the bending region (120) has a hardness smaller than that of the supporting layer (200) located in the display region (110) and the extension region (130);

the support layer (200) comprises:

a first support film (210), wherein the first support film (210) is attached to the first surface (140) and is positioned in the display area (110), the bending area (120) and the extension area (130);

a second support film (220), wherein the second support film (220) is attached to one side of the first support film (210) away from the first surface (140) and is positioned in the display area (110), the bending area (120) and the extension area (130), and the thickness of the first support film (210) in the bending area (120) is smaller than the thickness in the display area (110) and the extension area (130);

the second support film (220) is provided with a reinforcing part (230) for reinforcing the strength of the bending region (120), and the reinforcing part (230) is positioned at the bending region (120) and is close to the display region (110) or the extension region (130);

the width of the cross section of the reinforcing portion (230) gradually decreases from an end near the display region (110) or the extension region (130) to an end far from the display region (110) or the extension region (130).

2. The display panel of claim 1, wherein a gap (700) is formed between the first support film (210) and the second support film (220) at the bending region (120).

3. The display panel according to claim 2, wherein the second support film (220) is attached to the first support film (210) by an adhesive.

4. The display panel according to claim 1, wherein a plurality of grooves (121) are provided at intervals on a side of the first support film (210) located at the bending region (120) away from the first surface (140).

5. The display panel according to claim 4, wherein the intervals between the plurality of grooves (121) gradually decrease from both ends of the bending region (120) to the middle of the bending region (120).

6. A display panel as claimed in claim 5, characterized in that the recess (121) has a conical structure.

7. The display panel according to claim 6, wherein the first support film (210) has a thickness of 20 μm to 30 μm in the display region (110) and the extension region (130), the first support film (210) has a thickness of 10 μm in the bending region (120), and the second support film (220) has a thickness of 70 μm to 100 μm.

8. The display panel of claim 7, further comprising a support body (300) disposed between the second support film (220) located in the display region (110) and the second support film (220) located in the extension region (130).