WO2021017478A1

WO2021017478A1 - Display panel and display device

Info

Publication number: WO2021017478A1
Application number: PCT/CN2020/079259
Authority: WO
Inventors: 邓贤柱; 张萌; 孙增标; 王明玺
Original assignee: 昆山国显光电有限公司
Priority date: 2019-07-30
Filing date: 2020-03-13
Publication date: 2021-02-04
Also published as: CN110262702B; CN110262702A

Abstract

A display panel and a display device. The display panel comprises: a first substrate (101), a light-emitting functional layer (102), a second substrate (103) and a polarizer (105) that are successively stacked, as well as a display region (11), and a non-display region (12) which is located on at least one side of the display region. The surface far from the light-emitting functional layer (102) of the part of the second substrate (103) that is located in the non-display region (12) is provided with a thinning groove (20), and the thinning groove (20) extends to the side of the non-display region (12) far from the display region (11) in the direction along the display region (11) towards the non-display region (12); a touch driver board (106) is provided within the thinning groove (20); and an optical adhesive layer (104) extends from the display region (11) to the thinning groove (20), and partially covers the touch driver board (106).

Description

Display panel and display device

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office with application number 201910696860.6 on July 30, 2019, and the entire content of this application is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to narrow frame technology, such as a display panel and a display device.

Background technique

With the advancement of display technology, the realization of "true full screen" has become a goal for many display panel manufacturers to achieve first.

However, the display panel in the related art still has a larger frame and the screen-to-body ratio is still small.

Summary of the invention

The present application provides a display panel and a display device to reduce the frame of the display panel and increase the screen-to-body ratio of the display panel.

The embodiment of the present application provides a display panel, including:

The first substrate, the light-emitting function layer, the second substrate, the optical adhesive layer and the polarizer are stacked in sequence;

The display panel includes a display area and a non-display area located on at least one side of the display area; a portion of the second substrate located in the non-display area away from the light-emitting function layer is provided with a thinning groove along the surface. The display area points in the direction of the non-display area, the thinning groove extends to the side of the non-display area away from the display area; the touch drive board is arranged in the thinning groove;

The optical adhesive layer extends from the display area to the thinning groove and covers part of the touch drive board.

An embodiment of the present application also provides a display device, including the display panel described in any embodiment of the present application.

In the embodiment of the present invention, an optical adhesive layer is provided to cover the touch drive board, that is, the distance between the surface of the optical adhesive layer away from the second substrate and the second substrate is greater than the distance between the surface of the touch drive board away from the second substrate and the second substrate. The polarizer is attached to the optical adhesive layer, so that the attachment surface of the polarizer is higher than the surface of the touch drive plate away from the second substrate. When the polarizer is attached to the surface of the optical adhesive layer, the edge of the polarizer will not touch The control driver board collides, that is, it is no longer necessary to reserve a preset distance between the touch driver board and the polarizer to avoid the mutual interference between the two processes of the touch driver board binding process and the polarizer bonding process. Parallel to the direction of the second substrate, the distance between the polarizer and the touch driver board may be less than the preset distance, or the vertical projection of the polarizer on the second substrate may intersect the vertical projection of the touch driver board on the second substrate. This reduces the frame of the display panel and increases the screen-to-body ratio. And by providing a thinning groove on the surface of the second substrate that is located in the non-display area away from the light-emitting function layer, along the display area pointing to the non-display area, the thinning groove extends to the side of the non-display area away from the display area. The driving board is arranged in the thinning groove; because the thinning groove has a certain depth and thickness, the height difference between the upper surface of the touch driving board away from the second substrate and the second substrate is reduced. When the optical adhesive layer covers the touch driving board , The height difference of the climb is reduced, which can avoid the existence of air bubbles between the optical adhesive layer and the side of the touch driver board due to the excessive height difference of the optical adhesive layer, or the optical adhesive layer and the touch There are gaps between the sides of the control driving board to prevent water vapor or oxygen from entering the inside of the display panel through the bubbles or gaps and affecting the packaging reliability of the display panel, thereby prolonging the service life of the display panel.

Description of the drawings

FIG. 1 is a schematic diagram of a structure of a display panel in the related art;

2 is a schematic cross-sectional view of a display panel provided by an embodiment of the present application;

3 is a schematic cross-sectional view of another display panel provided by an embodiment of the present application;

4 is a schematic cross-sectional view of still another display panel provided by an embodiment of the present application;

5 is a schematic top view of a display panel provided by an embodiment of the present application;

6 is a schematic top view of another display panel provided by an embodiment of the present application;

7 is a schematic cross-sectional view of another display panel provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a display device provided by an embodiment of the present application.

Detailed ways

The application will be described below with reference to the drawings and embodiments. The embodiments described here are only used to explain the application, but not to limit the application. For ease of description, the drawings only show a part of the structure related to the present application instead of all of the structure.

For display panels in related technologies, for example, for display panels with touch functions, the display panel needs to reserve an area required for the binding of the touch driver board, which occupies a large space, and other components (such as polarizers, etc.) ) All need to avoid the touch driver board, which results in the display panel having a larger frame. FIG. 1 is a schematic structural diagram of a related art display panel. As shown in FIG. 1, the display panel includes a first substrate 101, a light-emitting function layer 102, a second substrate 103 and a polarizer 105, and the second substrate 103 is provided with The touch pad 202 is used for binding with the touch driver board 106; since the polarizer 105 is located at the boundary of the non-display area and the boundary of the light-emitting function layer 102 (display area of the display panel), there needs to be a certain gap a1 to ensure the The light leakage of the polarizer 105 cannot be seen in the display area; a certain preset distance a2 is required between the polarizer 105 and the touch driver board 106 to avoid the binding process of the touch driver board 106 and the bonding process of the polarizer 105 The touch pad 202 needs to have a certain width a3 to ensure the stability of the electrical connection between the touch driver board 106 and the touch pad 202; the touch pad 202 needs a certain distance from the edge of the second substrate 103 a4 is to ensure that the touch pad 202 will not be affected when the second substrate 103 is cut. Therefore, the width of the frame of the display panel in the related art is at least a1+a2+a3+a4, resulting in a wider frame.

Based on the above technical problems, this application proposes the following solutions:

FIG. 2 is a schematic cross-sectional view of a display panel provided by an embodiment of the present application. Referring to FIG. 2, the present embodiment provides a display panel, including:

The first substrate 101, the light-emitting function layer 102, the second substrate 103, the optical glue layer 104 and the polarizer 105 are stacked in sequence;

The display panel includes a display area 11 and a non-display area 12 located on at least one side of the display area 11; a portion of the second substrate 103 located in the non-display area 12 away from the light-emitting function layer 102 is provided with a thinning groove 20 that points along the display area 11 In the direction of the non-display area 12, the thinning groove 20 extends to the side of the second substrate 103 that is located on the side of the non-display area 12 away from the display area 11; the touch drive board 106 is disposed in the thinning groove 20;

The optical adhesive layer 104 extends from the display area 11 to the thinning groove 20 and covers a part of the touch driving board 106.

The first substrate 101 may be an array substrate that drives the light-emitting function layer 102 to emit light, and the first substrate 101 includes a driving circuit layer and the like. The light-emitting functional layer 102 may include an anode, a cathode, an organic light-emitting layer disposed between the anode and the cathode, and the like. The second substrate 103 may be a package substrate or the like. When the display panel adopts mutual-capacitive touch electrodes, the touch drive board 106 is used to provide touch drive signals to the touch electrodes and receive touch sensing signals returned by the touch electrodes. When the display panel adopts self-capacitive touch electrodes, the touch driving board 106 is used to receive touch sensing signals returned by the touch electrodes.

The optical adhesive layer 104 covers the touch drive board 106, that is, the distance between the surface of the optical adhesive layer 104 away from the first substrate 101 and the first substrate 101 is greater than the distance between the surface of the touch drive board 106 away from the first substrate 101 and the first substrate 101 Since the polarizer 105 is attached to the optical adhesive layer 104, the attachment surface of the polarizer 105 is higher than the surface of the touch drive board 106 away from the first substrate 101. When the polarizer 105 is attached to the surface of the optical adhesive layer 104 , The edge of the polarizer 105 will not collide with the touch driver board 106, that is, it is no longer necessary to reserve a preset distance between the touch driver board 106 and the polarizer 105 to avoid the binding process of the touch driver board 106 with the polarizer. 105. The mutual interference between the two processes of the bonding process, that is, along the direction parallel to the second substrate 103, the distance between the polarizer 105 and the touch driver board 106 can be less than the preset distance, or the polarizer 105 is in the second The vertical projection of the substrate 103 may overlap with the vertical projection of the touch drive board on the second substrate 103, thereby reducing the frame of the display panel and increasing the screen-to-body ratio. The preset distance is determined according to the alignment accuracy of the polarizer 105 and the touch driver board 106 in the related art, and an exemplary preset distance may be 0.2 mm.

In addition, by arranging the optical adhesive layer 104 to cover part of the touch drive board 106, under the premise of ensuring that the display panel has a smaller frame, the polarizer 105 can be attached to the optical adhesive layer 104 in a larger range, which reduces the adhesion. Difficulty in alignment, thereby reducing the difficulty of the bonding process and improving the yield of the display panel; and the optical adhesive layer 104 can protect and fix the touch drive board 106, which can increase the gap between the touch drive board 106 and the display panel. The firmness of the connection can prevent the touch drive board 106 from falling off or warping when the display panel is subjected to external forces, and improves the stability of the display panel.

In addition, by providing a thinning groove 20 on the surface of the second substrate 103 that is located in the non-display area 12 away from the light-emitting function layer 102, the thinning groove 20 extends to the non-display area 12 along the direction of the display area 11 pointing to the non-display area 12. Far away from the side of the display area 11, the touch drive board 106 is disposed in the thinning groove 20; because the thinning groove 20 has a certain depth and thickness, the touch drive board 106 is far away from the upper surface of the first substrate 101 and the second substrate The height difference of the upper surface of 103 away from the first substrate 101 is reduced. When the optical adhesive layer 104 covers the touch driver board 106, the climb height difference is reduced, which can prevent the optical adhesive layer 104 from climbing too large a height difference. There are bonding bubbles between the adhesive layer 104 and the side of the touch driver board 106 or there is a gap between the optical adhesive layer 104 and the side of the touch driver board 106 due to the problem of the positioning accuracy of the bonding, so as to avoid moisture or oxygen. The air bubbles or gaps penetrate into the interior of the display panel to affect the packaging reliability of the display panel, thereby prolonging the service life of the display panel.

FIG. 3 is a schematic cross-sectional view of another display panel provided by an embodiment of the present application. Optionally, referring to FIG. 3, a bonding pin 202 is provided in the thinning groove 20, and the touch driver board 106 and the bonding pin 202 Electrical connection; along the direction perpendicular to the second substrate 103, the maximum depth H of the thinning groove 202 is less than or equal to the total thickness D of the touch drive board 106 and the binding pin 202.

When the maximum depth H of the thinning groove 202 is too large, the upper surface of the touch driver board 106 away from the first substrate 101 may be lower than the upper surface of the second substrate 103 away from the light-emitting function layer 102, resulting in over-etching, increasing process difficulty and cost. By setting the maximum depth H of the thinning groove 202 to be less than or equal to the total thickness D of the touch driver board 106 and the binding pins 202, the height of the upper surface of the touch driver board 106 and the upper surface of the second substrate 103 can be reduced. At the same time, it reduces the process difficulty and cost.

In addition, referring to FIG. 3, when binding the touch driver board 106 to the binding pin 202, a certain misalignment binding can be performed, that is, the touch driver board 106 does not completely cover the binding pin 202, so that the binding leads The side of the foot 202 adjacent to the side wall of the thinning groove 20 exposes a part of the area. On the one hand, it can prevent the conductive glue used for binding from overflowing on the upper surface of the touch driver board 106 and affect other structures, and on the other hand, the touch driver board 106 There may be a larger gap between the side of the thinning groove 20 and the sidewall of the thinning groove 20, which can avoid that the gap is too small and the optical adhesive layer 104 cannot completely fill the gap.

4 is a schematic cross-sectional view of another display panel provided by an embodiment of the present application. Optionally, referring to FIG. 4, the thinning groove includes a first thinning groove 21 and a second thinning groove 22 that communicate with each other. The thin groove 21 is arranged on a side of the second thinned groove 22 adjacent to the display area 11;

Along the direction perpendicular to the second substrate 103, the depth of the first thinning groove 21 is smaller than the depth of the second thinning groove 22, and the binding pin 202 is disposed in the second thinning groove 22. The depth of the first thinning groove refers to the vertical distance between the bottom surface of the first thinning groove 21 and the upper surface of the second substrate 103 away from the first substrate 101, and the depth of the second thinning groove refers to the second The vertical distance between the bottom surface of the thinning groove 22 and the upper surface of the second substrate 103 away from the first substrate 101 is reduced.

After bonding the optical adhesive layer 104, the optical adhesive layer 104 first fills the depth of the first thinning groove 21, then fills the area between the second thinning groove 22 and the touch drive board 106, and finally climbs to the touch drive board The height difference between the upper surface of 106 and the upper surface of the second substrate 103, since the first thinning groove 21 and the binding pins 202 are lower than the upper surface of the second substrate 103, the optical adhesive layer 104 can be better The first thinning groove 21 is filled, and the first thinning groove 21 and the second thinning groove 22 reduce the height difference between the upper surface of the touch drive board 106 and the upper surface of the second substrate 103, thereby ensuring The optical adhesive layer 104 can better contact the side surface of the touch driver board 106 to avoid the generation of bonding bubbles or gaps. In addition, the first thinning groove 21 ensures that there is a large gap between the touch drive board 106 and the sidewall of the thinning groove adjacent to the display area 11, which can avoid that the gap is too small and the optical adhesive layer 40 cannot completely fill the gap. At the same time, since the first thinning groove 21 can accommodate the conductive glue that overflows when the touch driver board 106 is bound, the touch driver board 106 can be bound in a misaligned position or in a correct position, which reduces the binding to the touch driver board 106. The precision requirements reduce the process difficulty.

Optionally, referring to FIG. 4, along the direction perpendicular to the second substrate 103, the depth difference between the first thinning groove 21 and the second thinning groove 22 is greater than or equal to the thickness of the binding pin 202.

This arrangement makes the upper surface of the binding pin 202 adjacent to the touch driver board 106 lower than the bottom surface of the first thinning groove 21, so that along the first thinning groove 21 points to the direction of the second thinning groove 22, the optical adhesive layer The filling depth of 104 increases successively to ensure that the optical adhesive layer 104 fills the depth better, and it is better to match the bottom surface of the first thinning groove 21 and the upper surface of the binding pin 202 and the touch drive board 106 The side contact avoids bubbles or gaps between the optical adhesive layer 104 and multiple surfaces.

Optionally, FIG. 5 is a schematic top view of a display panel provided by an embodiment of the present application. Referring to FIG. 5, the first thinning groove 21 points to the second thinning groove 22, and is perpendicular to the first thinning groove 21 and In the direction X of the boundary where the second thinning groove 22 intersects, the width S of the first thinning groove 21 is greater than or equal to 50 microns and less than or equal to 100 microns.

This arrangement ensures that there is a large gap between the touch driver board 106 and the sidewall of the thinning groove 20 adjacent to the display area 11, and avoids that the gap is too small. The optical adhesive layer 40 cannot completely fill the gap, while ensuring touch control. The gap between the driving board 106 and the sidewall of the thinning groove 20 adjacent to the display area 11 will not be too large, causing the optical adhesive layer 104 to not be able to cross the gap well, and thus unable to completely contact the touch driving board 106 to produce adhesion Air bubbles or crevices.

Optionally, FIG. 6 is a schematic top view of another display panel provided by an embodiment of the present application. Referring to FIG. 6, along the direction Y parallel to the edge 23 of the thinning groove 20 adjacent to the display area, the thinning groove 20 penetrates the non-display District 12.

That is, the size of the thinning groove 20 along the direction Y parallel to the edge 23 of the thinning groove 20 adjacent to the display area 11 is equal to the size of the non-display area. With this arrangement, when the touch driver board is bound to the second substrate 103, along the direction Y parallel to the edge 23 of the thinning groove 20 adjacent to the display area 11, the alignment accuracy of the touch driver board is relatively low, which is less The etching process precision requirement of the thin groove 20 is also lower, which reduces the process difficulty.

Optionally, with continued reference to FIG. 4, the vertical projection of the polarizer 105 on the second substrate 103 partially overlaps the vertical projection of the touch drive board 106 on the second substrate 103.

With this arrangement, there is no gap between the polarizer 105 and the touch driver board 106 in the direction parallel to the second substrate 103, and the polarizer 105 is in the width of the non-display area 12 and the touch driver board 106 is bound to the second substrate 103. The sum of the fixed length is reduced, thereby reducing the frame of the display panel and increasing the screen-to-body ratio.

Optionally, the optical adhesive layer 104 adopts thermal curing adhesive.

Since the optical adhesive layer 104 is used to bond the polarizer 105, the general bonding process is to place the polarizer 105 on the uncured optical adhesive layer 104 and then cure the optical adhesive layer 104. Since the polarizer 105 can change the light If the ultraviolet curing method is adopted, the ultraviolet light may not be able to completely cure the optical adhesive layer 104 due to the effect of the polarizer 105, which affects the bonding effect. By arranging the optical adhesive layer 104 to use thermal curing adhesive, it is possible to ensure that the optical adhesive layer 104 is better cured, and the bonding stability of the polarizer 105 is ensured.

FIG. 7 is a schematic cross-sectional view of another display panel provided by an embodiment of the present application. Referring to FIG. 4 and FIG. 7, optionally, the second substrate 103 includes a touch electrode layer 203, a touch electrode layer 203 and binding pins 202 is electrically connected; the second substrate 103 also includes a packaging glass or a thin film packaging layer;

The touch electrode layer 203 is disposed on the surface of the encapsulation glass away from the first substrate 101 (FIG. 4 ), or the touch electrode layer 203 is disposed on the surface of the film encapsulation layer away from the first substrate 101, or the touch electrode layer 203 is disposed on the film encapsulation Inside the layer (Figure 7).

4, the second substrate 103 is a packaging substrate. When the display panel adopts glass packaging, the second substrate 103 includes packaging glass. The touch electrode layer 203 can be fabricated on the surface of the packaging glass, and touch pads 202 are connected to the The control drive board 106 is electrically connected. Referring to FIG. 7, when the display panel adopts thin film packaging, the second substrate 103 includes a thin film packaging layer, and the touch electrode layer 203 can be fabricated on the surface of the thin film packaging layer or inside the thin film packaging layer. By directly disposing the touch electrode layer 203 on the surface or inside of the second substrate 103, the display panel has a smaller thickness, which conforms to the development trend of thinner and lighter display panels.

FIG. 8 is a schematic structural diagram of a display device provided by an embodiment of the present application. Referring to FIG. 8, the display device 20 includes a display panel 19 provided by any embodiment of the present application. The display device provided by any embodiment of the present application may be a mobile phone or a computer. And display devices with display functions such as smart wearable devices, which are not limited in the embodiment of the present application.

The display device provided in this embodiment includes the display panel provided in any embodiment of the present application, and has the same functions and effects, which will not be repeated here.

Claims

A display panel including:

The first substrate, the light-emitting function layer, the second substrate, the optical adhesive layer and the polarizer are stacked in sequence;

The display panel includes a display area and a non-display area located on at least one side of the display area; a portion of the second substrate located in the non-display area away from the light-emitting function layer is provided with a thinning groove along the surface. The display area points in the direction of the non-display area, the thinning groove extends to the side of the non-display area away from the display area; the touch drive board is arranged in the thinning groove;

The optical adhesive layer extends from the display area to the thinning groove and covers part of the touch drive board.
The display panel of claim 1, wherein:

A binding pin is provided in the thinning groove, and the touch drive board is electrically connected to the binding pin; in a direction perpendicular to the second substrate, the maximum depth of the thinning groove is less than or Equal to the total thickness of the touch driver board and the binding pins.
The display panel according to claim 2, wherein:

The thinning groove includes a first thinning groove and a second thinning groove that are communicated with each other, and the first thinning groove is disposed on a side of the second thinning groove adjacent to the display area;

Along a direction perpendicular to the second substrate, the depth of the first thinning groove is smaller than the depth of the second thinning groove, and the binding pin is disposed in the second thinning groove.
The display panel of claim 3, wherein:

Along a direction perpendicular to the second substrate, the depth difference between the first thinning groove and the second thinning groove is greater than or equal to the thickness of the binding pin.
The display panel of claim 3, wherein:

Along the first thinning groove pointing to the second thinning groove and perpendicular to the direction of the boundary intersecting the first thinning groove and the second thinning groove, the width of the first thinning groove Greater than or equal to 50 microns, and less than or equal to 100 microns.
The display panel of claim 1, wherein:

The vertical projection of the polarizer on the second substrate partially overlaps the vertical projection of the touch drive board on the second substrate.
The display panel of claim 1, wherein:

Along a direction parallel to the edge of the thinning groove adjacent to the display area, the thinning groove penetrates the non-display area.
The display panel of claim 1, wherein:

The optical adhesive layer adopts thermal curing adhesive.
The display panel according to claim 2, wherein:

The second substrate includes a touch electrode layer, and the touch electrode layer is electrically connected to the binding pin;

The second substrate further includes packaging glass;

The touch electrode layer is disposed on the surface of the packaging glass away from the first substrate.
The display panel according to claim 2, wherein:

The second substrate includes a touch electrode layer, and the touch electrode layer is electrically connected to the binding pin;

The second substrate further includes a thin film packaging layer;

The touch electrode layer is disposed on the surface of the thin film packaging layer away from the first substrate, or the touch electrode layer is disposed in the thin film packaging layer.
A display device comprising the display panel according to any one of claims 1-10.