CN110874988B - Display device - Google Patents

Abstract

The application discloses a display device; the display device comprises a back plate, wherein a plurality of folding areas and non-folding areas are arranged on the back plate, and the folding areas are arranged between two adjacent non-folding areas; the folding area is provided with an opening extending in the height direction of the back plate, and the surface of the non-folding area is provided with an accommodating groove which is concave downwards. Through the arrangement, when the elastic layer is arranged on the back plate through the coating process, at least part of the elastic layer positioned in the folding area can enter the opening, and at least part of the elastic layer positioned in the non-folding area can enter the accommodating groove, so that the surface of the elastic layer, which is far away from the back plate, is smoother.

Description

Display device

Technical Field

The application relates to the field of intelligent display, in particular to a display device.

Background

With the development of information technology and mobile communication technology, display devices capable of displaying visual images have been developed, and recently, demand for foldable display devices has increased. The back plate of the foldable display device generally includes a folding region and a non-folding region, the folding region is provided with a plurality of openings recessed downward along the height direction, an elastic layer is laid on the back plate through a coating process, and the elastic layer can enter the openings so as to prevent the back plate from generating plastic deformation when being folded. The upper surface of the part of the elastic layer located in the folding area is used as a first upper surface, the upper surface of the part of the elastic layer located in the non-folding area is used as a second upper surface, the first upper surface is located below the second upper surface, namely the first upper surface is closer to the back plate than the second upper surface, and the upper surface of the elastic layer is uneven, so that the installation of components such as a display panel and the like located above the elastic layer is influenced.

Disclosure of Invention

The application provides a display device, it can guarantee to lay the upper surface of the elastic layer above the backplate level.

According to a first aspect of the present application, a display device is provided, where the display device includes a back plate, where a plurality of folding regions and a plurality of non-folding regions are provided on the back plate, and the folding regions are provided between two adjacent non-folding regions;

the folding area is provided with an opening extending in the height direction of the back plate, and the surface of the non-folding area is provided with an accommodating groove which is concave downwards.

Further, the number of the accommodating grooves is multiple;

the number of the receiving grooves in the non-folded region per unit area is gradually increased in a direction from the non-folded region toward the folded region.

Further, the number of the accommodating grooves is multiple;

the receiving groove in the non-folded region gradually increases in size in a direction from the non-folded region toward the folded region.

Furthermore, the number of the accommodating grooves and the number of the openings are multiple;

the difference value between the sum of the volumes of the accommodating grooves and the sum of the volumes of the openings is smaller than or equal to a first threshold value.

Further, the display device can be folded by taking a center line of the folding area as an axis, the number of the openings is multiple, and the plurality of openings extend along a direction parallel to the center line.

Furthermore, the number of the openings is multiple, and the adjacent openings are arranged in a staggered mode along the direction perpendicular to the center line.

Furthermore, the number of the openings is multiple, and the adjacent openings are arranged at intervals along the direction parallel to the central line.

Further, the size of the opening is gradually reduced in a direction from the center of the folded region toward the unfolded region.

Further, an elastic layer is arranged above the back plate, and at least part of the elastic layer enters the opening and the accommodating groove.

Furthermore, the elastic layer is made of silica gel.

Further, the opening includes a main body portion extending in the height direction of the backboard and an extension portion extending outward along a wall surface of the main body portion.

Further, the extension part is in a burr shape and/or a thread shape.

Further, the back plate comprises an upper surface and a lower surface which are oppositely arranged along the height direction;

the opening is gradually narrowed along the direction from the upper surface to the lower surface; and/or the opening narrows in size in a direction from the lower surface toward the upper surface.

Further, the opening penetrates through the back plate.

Further, the depth of the opening is smaller than the height of the back plate.

Further, the back plate comprises an upper surface and a lower surface which are oppositely arranged along the height direction;

the opening extends downwards from the upper surface of the backboard and/or the opening extends upwards from the lower surface of the backboard.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

through the arrangement, when the elastic layer is arranged on the back plate through the coating process, at least part of the elastic layer positioned in the folding area can enter the opening, and at least part of the elastic layer positioned in the non-folding area can enter the accommodating groove, so that the surface of the elastic layer, which is far away from the back plate, is smoother.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present application.

Fig. 2 is a schematic perspective view of a back plate according to an embodiment of the present application.

Fig. 3 is a schematic cross-sectional view of a backplate according to an embodiment of the present application.

Fig. 4 is a schematic perspective view of a back plate and an elastic layer according to an embodiment of the present application.

Fig. 5 is a schematic top view of a back plate according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a back plate according to another embodiment of the present application.

Fig. 7 is a schematic structural diagram of a display device according to another embodiment of the present application.

Fig. 8 is a schematic structural diagram of a display device according to yet another embodiment of the present application.

Description of the reference numerals

Display device 10

Back plate 100

Folding zone 101

Non-folded region 102

Center line 103

Upper surface 104

Lower surface 105

Opening 110

Accommodating groove 120

Elastic layer 200

First upper surface 201

Second upper surface 202

Display panel 400

Substrate 500

Protective layer 600

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in 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 also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that the terms "first," "second," and the like, as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.

The present application relates to a display device. The display device is a foldable display device, which may be an LCD display device, but of course, may also be an OLED display device. The display device can be applied to devices such as mobile phones, computers, tablets and electronic books.

As shown in fig. 1, the foldable display device 10 includes a back plate 100, an elastic layer 200, a substrate 500, a display panel 400, and a protective layer 600. The back sheet 100 and the elastic layer 200 are disposed under the substrate 500 to function as a support for the substrate 500, the display panel 400, and the protective layer 600. The substrate 500 is located at one end of the display panel 400 near the rear panel 100 to support the display panel 400. The protection layer 600 covers a side of the display panel 400 away from the rear panel 100 to protect the display panel 400 from external interference.

When the display device 10 is an LCD display device, the display panel 400 is a liquid crystal panel including upper and lower substrates (not shown) and a liquid crystal layer (not shown) between the upper and lower substrates. And driving an electric field generated between the upper substrate and the lower substrate of the liquid crystal layer to display an image. When the display device 10 is an OLED display device, the display panel 400 includes at least an organic light emitting diode including an anode, a cathode, and an organic light emitting layer between the anode and the cathode. In the organic light emitting diode, holes and electrons from an anode and a cathode, respectively, migrate to an organic light emitting layer, so that light is emitted from the organic light emitting layer to display an image. The lower surface 401 of the display panel 400 is attached to the substrate 500, and the substrate 500 may be made of polyimide or the like to support the display panel 400.

It should be noted that the lower surface 401 of the display panel 400 is the surface of the display panel 400 close to the backplane 100.

As shown in fig. 2, the back panel 100 is provided with a plurality of folding regions 101 and non-folding regions 102, and the folding regions 101 are disposed between two adjacent non-folding regions 102. In the present embodiment, the back sheet 100 includes two non-folding regions 102 and a folding region 101 located between the two folding regions 101, and the non-folding regions 102 are folded around a center line 103 of the folding region 101. The display device 10 is a two-fold structure of the display device 10. Of course, in other embodiments, the number of the non-folding regions 102 may be three or more, and the non-folding regions 102 are folded around the center line of the folding region 101. For example, when the number of the folding regions 101 is two and the number of the non-folding regions 102 is three, the display device 10 has a three-folding structure, and the display device 10 may have various modifications.

Referring to fig. 1 and 2, in the present embodiment, the substrate 500 supporting the display panel 400 is a flexible substrate, so that when the folding area 101 is folded, the flexible substrate and the display panel 400 can change in shape along with the folding of the back panel 100, thereby changing the shape of the display device 10 and realizing that the display device 10 is foldable. The back sheet 100 has a higher stiffness (stiff) than the substrate 500. In other words, the rear plate 100 has a larger young's modulus value (i.e., elastic modulus value) than the substrate 500 to better support the substrate 500, the display panel 400, the protection layer 600, and the like.

As shown in fig. 3 and 4, the folding region 101 of the back sheet 100 is provided with a plurality of openings 110 extending in the height direction H of the back sheet 100, and the surface of the non-folding region 102 is provided with receiving grooves 120 recessed downward. In the present embodiment, the opening 110 penetrates the back plate 100 in the height direction.

Of course, in other embodiments, the opening 110 may not penetrate through the back plate 100, that is, the depth of the opening 110 is smaller than the height of the back plate 100. As shown in fig. 6, the back plate 100 includes two oppositely disposed upper and lower surfaces 104 and 105 in the height direction H. In the present embodiment, the opening 110 extends downward from the upper surface 104 of the backplate 100, and at this time, the elastic layer 200 is laid on the upper surface 104 of the backplate 100, and at least a part of the elastic layer 200 enters the inside of the opening 110. As shown in fig. 8, the opening 100 may also extend upward from the lower surface 105 of the backplate 100, in which case, the elastic layer 200 is laid on the lower surface 105 of the backplate 100, and at least a portion of the elastic layer 200 enters the inside of the opening 110, and a groove is formed in the lower surface 105 of the backplate 100, so that the surface of the elastic layer 200 away from the backplate 100 is kept flat, and when it is required to mount the backplate 100 and the elastic layer 200 as a whole, the stable positioning of the backplate 100 can be ensured. Of course, the plurality of openings 110 on the back plate 100 can be divided into two groups, one group of openings 110 extends downward from the upper surface 104 of the back plate 100, and the other group of openings 110 extends upward from the lower surface 105 of the back plate 100. Note that, in order to clearly show the shape and position of the opening 110, the structure of the groove is not shown in fig. 6 and 8.

Further, in one embodiment, as shown in fig. 3 and 4, the openings 110 are the same size in a direction from the upper surface 104 to the lower surface 105. In yet another embodiment, as shown in fig. 6, the opening 110 narrows in size in a direction from the upper surface 104 toward the lower surface 105. Alternatively, as shown in fig. 7, the opening 110 may gradually narrow in size in a direction from the lower surface 105 toward the upper surface 104. Of course, the plurality of openings 110 may be divided into two groups, wherein the size of one group of openings 110 gradually narrows and the size of the other group of openings 110 gradually widens along the direction from the upper surface 104 to the lower surface 105. With the above arrangement, the volume of the elastic layer 200 positioned in the opening can be increased, facilitating the bending of the display device 10.

As shown in fig. 3 and 4, in the process of laying the elastic layer 200 on the back sheet 100, the elastic layer 200 has a certain fluidity, and the elastic layer 200 located at the folding region 101 flows into the opening 110, so that the upper surface of the elastic layer 200 located above the folding region 101 sags. The elastic layer 200 located in the opening 110 not only serves to adhere to the back plate 100, but also can generate elastic deformation and provide enough deformation, so that when the display device 10 is folded, enough deformation can be generated on the premise of ensuring that the back plate 100 can be reset, and the back plate 100 is ensured to have enough rigidity. The elastic layer 200 located above the non-folded region 102 may flow into the receiving groove 120 such that the upper surface of the elastic layer 200 located above the non-folded region 102 is also depressed. With the arrangement that the upper surface of the elastic layer 200 located above the folding region 101 is used as the first upper surface 201, and the upper surface of the elastic layer 200 located above the non-folding region 102 is used as the second upper surface 202, the step difference between the first upper surface 201 and the second upper surface 202 can be reduced, so that the upper surface of the elastic layer 200 is smoother, the fixing substrate 500 and the display panel 400 on the elastic layer 200 are more stable, and the structural stability of the display device 10 is ensured. In the present embodiment, the elastic layer 200 may be formed on the back plate 100 through a coating process.

It should be noted that the upper surface of the elastic layer 200 is the surface of the elastic layer 200 away from the backplate 100.

In the present embodiment, the opening 110 and the receiving groove 120 may be formed on the back plate 100 through a patterning process, and the back plate 100 shown in fig. 2 is a structure that has not been subjected to the patterning process. Of course, in other embodiments, the opening 110 and the receiving groove 120 may be formed on the back plate 100 by other processes.

The elastic layer 200 is disposed over the backplate 100, and the substrate can be adhered to the elastic layer 200 by adhesion, for example, an adhesive layer (not shown) can be added between the substrate 500 and the elastic layer 200 to achieve a fixed connection therebetween.

Further, the number of the receiving grooves 120 is plural.

As shown in fig. 5, in one embodiment, the number of the receiving grooves 120 in the non-folding region 102 per unit area is gradually increased along the direction from the non-folding region 102 to the folding region 101. During the process of laying the elastic layer, the upper surface of the elastic layer 200 sags into the opening 110 above the folded region 101, and by providing more accommodating grooves 120 at the non-folded region 102 near the folded region 101, the upper surface of the portion of the elastic layer near the folded region 101 sags to the same extent as the upper surface of the elastic layer above the folded region 101, so as to ensure the flatness of the upper surface of the elastic layer.

In another embodiment, as shown in fig. 1, the receiving groove 120 in the non-folding region 102 gradually increases in size in a direction from the non-folding region 102 toward the folding region 101. The size of the receiving groove 120 referred to herein may be any one or more of the depth, length, width, or the like of the receiving groove 120. In the present embodiment, the receiving groove 120 has a hemispherical shape, and the radius of the receiving groove 120 in the non-folding region 102 gradually increases along the direction from the non-folding region 102 to the folding region 101. Of course, in other embodiments, the receiving groove 120 may also be rectangular, ellipsoidal, conical, or any other shape.

Further, in each of the above embodiments, the difference between the sum of the volumes of the plurality of accommodating grooves 120 and the sum of the volumes of the plurality of openings 110 is equal to or less than the first threshold value. The size of the first threshold value can be set according to actual requirements. Generally, the first threshold is smaller so that the sum of the volumes of the plurality of receiving grooves 120 is the same as or substantially the same as the sum of the volumes of the plurality of openings 110, thereby reducing the level difference between the first upper surface 201 and the second upper surface 202, and making the upper surface of the elastic layer 200 more flat. When the first threshold value is zero, the sum of the volumes of the plurality of receiving grooves 120 is the same as the sum of the volumes of the plurality of openings 110, and the first upper surface 201 is depressed to an extent equivalent to the second upper surface 202 (see fig. 4).

Further, as shown in fig. 2 and 5, when the display device 10 is folded around the center line 103 of the folding area 101, the plurality of openings 110 each extend in a direction parallel to the center line 103, that is, the length direction X of the opening 110 is parallel to the center line 103 of the folding area 101. When the display apparatus 10 is folded, the size of the opening 110 can be appropriately enlarged, so that the shape of the folding area 101 is changed to provide the amount of deformation required for folding the display device.

As shown in fig. 5, adjacent openings 110 are spaced apart in a direction parallel to the center line 103, i.e., the length direction X of the openings 110, and in a direction Y perpendicular to the center line 103. Through the above arrangement, the connection of the plurality of openings 110 is avoided, and the sufficient rigidity of the rear panel 100 is ensured, so as to support the substrate, the display panel, the protection layer and other structures above the rear panel 100.

Further, the adjacent openings 110 are arranged in a staggered manner along the direction Y perpendicular to the center line 103. With the above arrangement, the number of the openings 110 in the direction Y perpendicular to the center line 103 is equivalent while ensuring sufficient rigidity of the rear panel 100, so that the folding capabilities of the folding regions 101 at various positions are equivalent, and the display device can be stably folded.

Further, in some embodiments, the size of the opening 110 gradually decreases in a direction from the center of the folded region 101 toward the non-folded region 102. In the process of folding the display device, the amount of deformation of the center position of the folding region 101 of the rear panel 100 is greater than that of the edge region of the folding region 101. By increasing the size of the opening 110, the elastic layer to be laid subsequently can enter more into the opening 110 located at the center of the folding area 101, and the size of the elastic layer 200 located at this position is larger, so that a sufficient amount of deformation can be provided, and the function of connecting the back panel 100 can be achieved.

Referring to fig. 1, in the above embodiments, the material of the elastic layer 200 is silicone, which can ensure that the elastic layer 200 can generate enough elastic deformation and can adhere to the inner wall of the opening 110 of the back plate 100. Meanwhile, the silicone material has a certain rigidity, so that the elastic layer 200 and the back plate 100 can jointly function as a support substrate 500, a display panel 400, and a protection layer 600. Of course, in other embodiments, the material of the elastic layer 200 may be other materials that can be elastically deformed.

In the present embodiment, the back plate 100 may be formed of metal, such as stainless steel (SUS), or polymer, such as Polymethylmethacrylate (PMMA), Polycarbonate (PC), Polyacrylate (PA), polyvinyl alcohol (PVA), Acrylonitrile Butadiene Styrene (ABS), polyethylene terephthalate (PET). When the back plate 100 is made of a high rigidity material, for example, the back plate 100 is made of a stainless steel (SUS) material, the back plate 100 has a high restoring force. In the design process, the thickness of the rear plate 100 can be reduced, thereby reducing the thickness of the display device 10 and realizing a light and thin design.

Further, as shown in fig. 6 to 8, the opening 110 includes a main body portion 111 and an extending portion 112, the main body portion 111 extends along the height direction of the back plate 100, and the extending portion 112 extends outward along the wall surface of the main body portion 111. Referring to fig. 6, the extension 112 extends in the height direction H of the back sheet 100. As shown in fig. 7, the extension 112 may also extend in a direction Y perpendicular to the center line. Of course, the extension 112 may also extend in any direction.

In the above arrangement, the contact area and roughness of the elastic layer 200 entering the opening 110 and the opening 110 are increased by the extension 112, so that the elastic layer 200 and the back plate 100 are prevented from peeling off when being bent, and the stable connection between the two is ensured.

In this embodiment, the opening 110 having the main body 111 and the extending portion 112 and the groove may be provided on the back plate 100 at the same time. Of course, the opening 110 having the main body 111 and the extending portion 112 may be separately provided on the backboard 100, that is, only the opening 110 having the main body 111 and the extending portion 112 may be provided on the backboard 100, and the elastic layer 200 and the backboard 100 can be stably connected.

Further, as shown in fig. 6, the extending portion 112 is formed in a burr shape, and the extending portion 112 can be provided by increasing the surface roughness of the main body portion 111 to be avoided, so that the operation is simple. Of course, in other embodiments, the extension portion 112 may be threaded, and the operation may be simplified by providing the extension portion 112 in the main body portion 111 by tapping or other means. Of course, as shown in fig. 8, the opening 110 may have both the burr-shaped extension 112 and the screw-shaped extension 112. Similarly, the extension portion 112 may have any other shape to increase the contact area between the elastic layer 200 and the backplate 100, so as to achieve a stable connection therebetween. Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims (10)

1. A display device is characterized by comprising a back plate and an elastic layer, wherein the back plate is provided with a plurality of folding areas and non-folding areas, and the folding areas are arranged between two adjacent non-folding areas;

the folding area is provided with a plurality of openings which extend along the height direction of the back plate and penetrate through the back plate, the openings are arranged at intervals, and the surface of the non-folding area is provided with an accommodating groove which is concave downwards;

the number of the accommodating grooves is multiple;

the size of the accommodating groove in the non-folding area is gradually increased along the direction from the non-folding area to the folding area;

the elastic layer is arranged above the back plate, and in the preparation process of the elastic layer, the elastic layer has fluidity, and at least part of the elastic layer enters the opening and the accommodating groove.

2. The display device according to claim 1, wherein a difference between a sum of volumes of the plurality of accommodating grooves and a sum of volumes of the plurality of openings is equal to or less than a first threshold value.

3. The display device according to claim 1, wherein the display device is foldable about a center line of the folding area, and the plurality of openings each extend in a direction parallel to the center line.

4. The display apparatus of claim 3, wherein adjacent ones of the openings are offset in a direction perpendicular to the centerline.

5. The display apparatus of claim 3, wherein adjacent ones of the openings are spaced apart in a direction parallel to the centerline.

6. The display device according to claim 3, wherein the opening is gradually reduced in size in a direction from a center of the folding area toward the non-folding area.

7. The display device according to claim 1, wherein a material of the elastic layer is silicone rubber.

8. The display device according to claim 1, wherein the opening includes a main body portion extending in a height direction of the back plate and an extension portion extending outward along a wall surface of the main body portion.

9. A display device as claimed in claim 8, characterized in that the extensions are burr-shaped and/or thread-shaped.

10. The display device of claim 1, wherein the back plate includes two oppositely disposed upper and lower surfaces in a height direction;

the opening is gradually narrowed along the direction from the upper surface to the lower surface; and/or the opening narrows in size in a direction from the lower surface toward the upper surface.

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