CN112419890B

CN112419890B - Backboard and display device

Info

Publication number: CN112419890B
Application number: CN202011242443.3A
Authority: CN
Inventors: 丁峰
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2023-01-10
Anticipated expiration: 2040-11-09
Also published as: CN112419890A

Abstract

The application discloses backplate and display device, the backplate is including the backplate body and the protection film that stack gradually along its thickness direction, wherein: the backboard body is provided with at least one first hollow structure at the bent part; the protective film is provided with at least one second hollow structure at the bent part, and at least part of the orthographic projection of the second hollow structure on the back plate body falls into the first hollow structure; this application the backplate with have the display device of backplate can be avoiding the defoaming technology behind backplate and the laminating of laminating glue film bad, reduces the risk of latent influence product bending performance.

Description

Backboard and display device

Technical Field

The application relates to the technical field of display, in particular to a back plate and a display device.

Background

As the flexible panel technology matures, the flexible display panel (panel) has become available in mass production and provides a reliable technical support for the development of foldable products.

Fig. 1 is a cross-sectional view of a conventional display device, and fig. 2 is a plan view of a conventional backplane. As shown in fig. 1 and 2, the display device includes a back plate 11, a glue layer 12, and a display panel 20. In order to increase the strength of the bending region 201 of the display panel20, the hollow structure 111 is added in the area of the back plate body 11 corresponding to the bending region 201. In the conventional process, the back plate 11 and the adhesive layer 12 are first attached to the bottom layer of the panel 20.

Fig. 3 is a sectional view of the conventional back sheet and the adhesive layer in a bonded state, and fig. 4 is a sectional view of the back sheet in fig. 3, which is defoamed at a high temperature and a high pressure and is defective.

As shown in fig. 3 and 4, release films having protective effects are respectively disposed on the surfaces of the back sheet 11 and the adhesive layer 12 away from each other. As shown in fig. 4, after the back plate 11 is attached to the adhesive layer 12, a defoaming process is required, and the gas between the region where the hollow-out structure 111 is formed and the adhesive layer 12 is heated to expand and easily accumulate bubbles to generate a "bulge" phenomenon through high-temperature and high-pressure defoaming, which is not beneficial to the subsequent process and has an unknown risk on the bending performance of the product.

Therefore, it is desirable to provide a back plate and a display device to solve the above problems.

Disclosure of Invention

In order to solve the problems, the application provides a backboard and a display device, the backboard can avoid the defect of defoaming process after the backboard is attached to the adhesive layer through setting the second hollow structure at the bending part of the protective film and configuring the area and the position of the second hollow structure, and the risk of influencing the bending performance of the product is reduced.

In order to achieve the purpose, the backboard and the display device adopt the following technical scheme.

The utility model provides a backplate has the kink that is used for buckling, a serial communication port, the backplate is including the backplate body and the protection film that stack gradually along its thickness direction, wherein: the back plate body is provided with at least one first hollow structure at the bent part; the protective film is provided with at least one second hollow structure at the bent part, and at least part of the orthographic projection of the second hollow structure on the back plate body falls into the first hollow structure.

Further, the orthographic projection of the second hollow structure on the back plate body falls into the first hollow area.

Further, the second hollow structure is located at a position of the protective film corresponding to the first hollow structure.

Further, the area of the second hollow structure is smaller than that of the first hollow structure.

Further, the planar shape of the first hollow structure is at least one of a rhombus shape, a triangle shape, a trapezoid shape or a circle shape.

Further, the planar shape of the second hollow structure is at least one of a rhombus, a triangle, a trapezoid or a circle.

Further, the backplate still includes a laminating glue film, the laminating glue film set up in keeping away from of backplate body protection film one side.

Further, the back plate further comprises a discrete film, and the discrete film is arranged on one side, far away from the back plate body, of the bonding glue layer.

The present application further provides a display device comprising the backplane of any of the above.

Furthermore, the display device further comprises a display panel, the display panel is arranged on one side of the back plate body far away from the protective film, and the bending part of the back plate body corresponds to the bending area of the display panel.

This application backplate and display device's beneficial effect lies in:

according to the application, the second hollow structure is arranged on the protective film, and the second hollow structure can expose the hollow area of the first hollow structure, so that gas expanded by heating between the back plate and the adhesive layer can be smoothly discharged, the phenomenon of bulging caused by gas is avoided, the risk of potential reduction of the performance of a bending area is reduced, and the adhesive effect is improved; through the position and the area of the first hollow structure and the second hollow structure, the orthographic projection of the second hollow structure completely falls into the orthographic projection of the first hollow structure, so that the protective film has the functions of protecting the back plate and preventing bulging.

Drawings

The technical solutions and other advantages of the present application will become apparent from the following detailed description of specific embodiments of the present application when taken in conjunction with the accompanying drawings.

FIG. 1 is a cross-sectional view of a conventional display device;

FIG. 2 is a plan view of a conventional backplane;

FIG. 3 is a cross-sectional view of a conventional backsheet and an adhesive layer in a bonded state;

FIG. 4 is a cross-sectional view of the back plate of FIG. 3 after high-temperature and high-pressure defoaming;

FIG. 5 is a cross-sectional view of a backing plate according to the present application;

FIG. 6 is a plan view of a backing plate according to the present application;

FIG. 7 is a plan view of a protective film according to the present application;

fig. 8 is a cross-sectional view of a display device according to the present application.

Detailed Description

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 should be apparent that the described embodiments 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.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

Fig. 5 is a sectional view of a back plate according to the present application, fig. 6 is a plan view of the back plate according to the present application, and fig. 7 is a plan view of a protective film according to the present application.

As shown in fig. 5, 6 and 7, the present application provides a back sheet 10, where the back sheet 10 has a bending portion 101 for bending, and the back sheet 10 includes a back sheet body 11 and a protective film 12 stacked in sequence in a thickness direction thereof. Wherein: the back plate body 11 is provided with at least one first hollow structure 111 at the bent portion 101, the protective film 12 is provided with at least one second hollow structure 121 at the bent portion 101, and at least a part of the second hollow structure 121 in the orthographic projection of the back plate body 11 falls into the first hollow structure 111.

This application backplate 10 can expose first hollow out construction 111's second hollow out construction 121 through setting up on protective film 12, enables between backplate body 11 and laminating glue film 13 because of the gaseous smooth discharge of thermal expansion, and then can avoid because gaseous emergence that leads to "swell" phenomenon, reduces the risk that potentially leads to display panel bending zone performance to reduce, can also improve the laminating effect.

As shown in fig. 5, the back plate 10 includes a first sub-portion 102, a bending portion 101, and a second sub-portion 103 connected in sequence.

Referring to fig. 5, the bending portion 101 is located between the first sub-portion 102 and the second sub-portion 103 and can be bent. In other words, the first sub-portion 102 forms an included angle with the second sub-portion 103 through the bending portion 101.

Specifically, the bending portion 101 corresponds to a bending region of the display panel and can maintain a certain bending or bending shape according to the display panel or the display screen. The first sub-portion 102 and the second sub-portion 103 correspond to non-bending regions of the display panel, respectively. For example, in this embodiment, the back panel 10 can be used for a folding screen.

It should be noted that the application does not limit the specific number or position of the bent portion 101. For example, in a specific implementation, the bent portion 101 may also be located in one or more edge regions of the back sheet 10, in which case, the back sheet 10 can be used for a curved display screen or a hyperboloid display screen.

As shown in fig. 5, at least one first hollow structure 111 is formed in the back plate body 11 in the bending portion 101, and the first hollow structure 111 penetrates through the thickness of the back plate body 11.

By forming the first hollow structure 111, when the back plate 10 is bent along with the display panel or the display device, the stress generated by the bent portion 101 of the back plate body 11 can be reduced, so that the back plate body 11 and the display panel can be adhered more firmly.

As shown in fig. 6, the first hollow structures 111 are arranged in an array.

Specifically, the planar shape of the first hollow structure 111 is at least one of a diamond shape, a triangle shape, a trapezoid shape, or a circle shape. For example, as shown in fig. 6, in the present embodiment, the first hollow structure 111 is rectangular. In other embodiments, the first hollow structure 111 may also be a diamond.

That is, the arrangement, shape or number of the first hollow structures 111 is not limited in this application, and in the specific implementation, those skilled in the art can perform specific setting according to actual requirements.

Specifically, the back plate body 11 is SUS (stainless steel). In other embodiments, the back plate body 11 may also be made of a glass material or PI, or may be made of other materials, which is not specifically limited in this application embodiment. In specific implementation, the back plate body 11 can be provided with a heat dissipation pattern or a support structure according to an actual structure of the display device, which is not specifically limited in this embodiment of the application.

As shown in fig. 5, the protection film 12 is disposed on a side of the back plate body 11 away from the display panel to protect the back plate body 11.

As shown in fig. 5, at least one second hollow structure 121 is disposed at the bending portion 101 of the protection film 12, and at least a part of the orthogonal projection of the second hollow structure 121 on the back plate body 11 falls into the first hollow structure 111.

As shown in fig. 6, an orthographic projection of the second hollow structure 121 on the backplate body 11 falls into the first hollow region 11. The area of the second hollow structure 121 is smaller than that of the first hollow structure 111.

As shown in fig. 5, the second hollow structure 121 is located at a position of the protective film 12 corresponding to the first hollow structure 111.

Specifically, the planar shape of the second hollow structure 121 is at least one of a diamond shape, a triangle shape, a trapezoid shape, or a circle shape.

In specific implementation, the second hollow structure 121 may have a shape different from that of the first hollow structure 111. For example, as shown in fig. 7, in the present embodiment, the second hollow structure 121 is diamond-shaped, and the first hollow structure 111 is rectangular. In other embodiments, the second hollow structure 121 may have the same or approximately the same shape as the first hollow structure 111.

As shown in fig. 5, a bonding adhesive layer 13 is disposed on the surface of the back plate body 11 away from the protective film 12. The adhesive layer 13 is used for attaching the back panel 10 to the display panel.

In specific implementation, the adhesive layer 13 may be an optical adhesive layer (OCA) or a foam rubber layer (foam). The material of the optical Adhesive layer can be Optical Clear Adhesive (OCA), the OCA is a special Adhesive for gluing transparent optical elements, and the optical Adhesive layer has the advantages of being colorless and transparent, having the light transmittance of more than 90 percent, and having good gluing strength, and has the viscoelasticity.

As shown in fig. 5, a release film 14 is disposed on a surface of the adhesive layer 13 away from the protective film 12 to protect the adhesive layer 13.

In the back plate 10, the second hollow structure 121 capable of exposing the hollow area of the first hollow structure 121 is arranged on the protective film 12, so that gas expanded by heating between the back plate 11 and the bonding adhesive layer 13 can be smoothly discharged, the phenomenon of 'bulging' caused by gas can be avoided, the risk of potential reduction of the bending area of the display panel or the display device caused by the gas is reduced, and the bonding effect is improved; by configuring the positions and areas of the first hollow-out structures 111 and the second hollow-out structures 121, the orthographic projection of the second hollow-out structures 121 completely falls into the orthographic projection of the first hollow-out structures 111, so that the protective film 12 has the functions of protecting the back plate 10 and preventing 'bulging'.

Fig. 8 is a cross-sectional view of a display device according to the present application. As shown in fig. 8, the present application provides a display device 100, wherein the display device 100 includes a back plate 10 and a display panel 20.

The back plate 10 is the back plate 10 of the present application, and for the specific structure of the back plate 10 of the present application, reference is made to the above, which is not repeated herein.

As shown in fig. 8, the display panel20 is disposed on a side of the back plate 10 away from the protective film 12. Or, the display panel20 is disposed on one side of the back panel 10 facing the adhesive layer 13, and is attached to the back panel 10 through the adhesive layer 13.

For example, as shown in fig. 8, in the present embodiment, the bending portion of the display panel20 is correspondingly attached to the bending portion 101 of the back plate 10.

The display panel20 may be a flexible display panel. The type of the flexible Display panel is not limited herein, and it may be an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode), or a Quantum Dot electroluminescent (QLED) Display panel.

For example, as shown in fig. 8, in the present embodiment, the display panel20 includes a substrate 21, a thin-film transistor layer 22, and a light-emitting device layer 23.

As shown in fig. 8, the substrate 21 is disposed on a side of the adhesive layer 13 away from the backplate body 11. In specific implementation, the substrate 21 is made of a polymer material having light-transmitting and flexible properties. For example, the substrate 21 may include polyimide, silicone, epoxy-based resin, acrylic resin, polyester, and/or the like. In one embodiment, the substrate 21 may comprise polyimide.

Specifically, the thin-film transistor layer 22 includes a plurality of insulating layers, and a metal layer and a semiconductor layer (not shown) disposed between the insulating layers. The multilayer insulating layers, and the multilayer metal layers and the semiconductor layers arranged between the multilayer insulating layers can be used for forming a thin film transistor.

Wherein the multiple insulating layers are laminated on the surface of the substrate 21 facing away from the backplate 10. Specifically, the multi-layer insulating layer includes a buffer layer, a gate insulating layer, and an interlayer insulating layer and a planarization layer.

The multilayer metal layer comprises a gate metal layer and a source drain metal layer, and in other embodiments, the multilayer metal layer may further comprise a pixel electrode layer.

In particular, the thin film transistor can be used for a switching or driving thin film transistor. The type or structure of the thin film transistor is not limited in the application, and the type or structure can be changed or selected according to actual display requirements. For example, the thin-film transistor layer 22 may be a top-gate thin-film transistor or a bottom-gate thin-film transistor.

It should be noted that the type, arrangement, size, structure, connection relationship, and other configurations of the thin film transistor are not limited to the embodiments as exemplified in the embodiments of the present application. As long as the specific configuration of the thin film transistor is appropriate, it can be used to implement switching or driving of the light emitting device layer 23.

As shown in fig. 8, the light emitting device layer 23 is disposed on the multi-layered insulating layer and covers the multi-layered insulating layer and the substrate 21.

Specifically, the light-emitting device layer 23 includes an anode, a light-emitting function layer, and a cathode. Wherein the anode, the organic light-emitting layer and the cathode together form a light-emitting device.

For example, in the present embodiment, the light emitting device is an OLED device. The light emitting function layer is the organic light emitting layer. In other embodiments, the light emitting functional layer further comprises at least one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, or an electron injection layer.

In other embodiments, the light emitting device layer 23 may further include a pixel defining layer or a spacer layer. Wherein the pixel defining layer is formed with a plurality of pixel openings for defining the light emitting device.

Specifically, the anode is located on the surface of the multilayer insulating layer facing away from the substrate 21 and is exposed by the pixel opening of the pixel defining layer; meanwhile, the anode is electrically connected to the drain of the thin film transistor through a via hole penetrating through the multilayer insulating layer.

Specifically, an organic light emitting layer is formed on an anode electrode exposed region from the pixel opening. The organic light emitting layer is formed of an organic light emitting material for generating red, blue or green light.

Specifically, a cathode is formed on the surface of the organic light emitting layer, and the edge of the cathode covers the pixel defining layer at the periphery of the pixel opening. In specific implementation, the cathode may be provided separately for each light emitting device, or may be provided commonly for a plurality of or all light emitting devices. For example, the cathode may be a planar cathode structure.

In other embodiments, the display panel 100 may further include an encapsulation layer on the light emitting device layer 23. The encapsulation layer is disposed on the light emitting device layer 23 and covers the light emitting device layer 23, the thin-film transistor layer 22, and the substrate 21, thereby preventing penetration of moisture or other external contaminants into the light emitting device layer 23 and the thin-film transistor layer 22. Specifically, the encapsulation layer comprises a plurality of inorganic encapsulation layers and organic encapsulation layers which are staggered and stacked.

In other embodiments, the display device 100 further includes a driving chip, a polarizing layer, a cover plate, a heat dissipation function layer, and a cover plate. For example, in some other embodiments of the present disclosure, the display device may further include, for example, a touch electrode layer, a protective layer, or other suitable structural or functional layers, which is not limited by the embodiments of the present disclosure. It should be noted that the embodiments of the present disclosure do not limit the specific structure and arrangement of the functional layers, for example, or other functional layers.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The backplane and the display device provided by the embodiment of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. The utility model provides a backplate, has the kink that is used for buckling, its characterized in that, backplate is including the backplate body and the protection film that stack gradually along its thickness direction, wherein:

the backboard body is provided with a plurality of first hollow structures which are arranged in an array manner at the bending part, and the planar shape of each first hollow structure is at least one of diamond, triangle, trapezoid or circle;

the protection film is in the kink is equipped with a plurality of second hollow out construction that the array was arranged, one the second hollow out construction corresponds the setting with one first hollow out construction to one the second hollow out construction is in the orthographic projection of backplate body falls into one first hollow out construction.

2. The backplane of claim 1, wherein an area of the second hollow structure is smaller than an area of the first hollow structure.

3. The backplate of claim 1, wherein the planar shape of the second hollow structure is at least one of diamond, triangle, trapezoid, or circle.

4. The back plate of claim 1, further comprising a bonding adhesive layer disposed on a side of the back plate body away from the protective film.

5. The backing sheet of claim 4 further comprising a discrete film disposed on a side of the adhesive layer away from the backing sheet body.

6. A display device, characterized in that the display device comprises a back sheet according to any one of claims 1 to 5.

7. The display device according to claim 6, wherein the display device further comprises a display panel disposed on a side of the rear panel body away from the protective film, and the bending portion of the rear panel body corresponds to a bending region of the display panel.