A display module

Abstract

The present application provides a display module, which includes a display panel. The display panel has a display area, a bending area, and a wiring area located between the display area and the bending area. The display panel includes a first substrate, a conductive layer, a second substrate, and a driving circuit layer that are sequentially stacked. Among them, the first substrate forms a notch in the bending area, the second substrate is provided with vias in the wiring area, the driving circuit layer includes signal lines extending from the display area to the wiring area, the conductive layer includes connection lines extending from the bending area to the wiring area, one end of the connection line is exposed by the notch, and the other end of the connection line is electrically connected to the signal line through the via. By providing a connection line electrically connected to the signal line between the two substrates and providing a notch exposing the connection line on the first substrate in the bending area in the present application, an external circuit can transmit an electrical signal to the display area through the connection line, while ensuring the display effect, narrowing the width of the lower border of the display panel, and improving the screen-to-body ratio.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display module. Background Art

[0002] OLED (Organic Light Emitting Diode) display devices have been listed as the next generation display technology with great development prospects due to their advantages such as thinness, lightness, wide viewing angle, active light emission, continuously adjustable light color, low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple production process, high light emission efficiency and flexible display.

[0003] The existing OLED display panel includes a display area and upper, lower, left and right frame areas, and the lower frame area generally includes a routing area and a terminal bending area (pad bending area). The routing area is provided with fanout routing, VDD routing and VSS routing, which occupies a large frame width, and the bending radius of the pad bending area has a bending limit and cannot be further reduced, which leads to a larger width of the lower frame area, making it difficult for the OLED display panel to achieve a narrow frame. This problem needs to be solved urgently. Summary of the invention

[0004] The present application provides a display module that can reduce the width of a lower frame of a display panel to achieve a narrow frame.

[0005] In order to achieve the above-mentioned purpose, the display module of the present application adopts the following technical solution.

[0006] The present application provides a display module, the display module includes a display panel, the display panel has a display area, a bending area, and a wiring area located between the display area and the bending area, the display panel includes a first substrate, a conductive layer, a second substrate and a driving circuit layer stacked in sequence,

[0007] Among them, the first substrate is formed with a notch in the bending area, the second substrate is provided with a via in the routing area, the driving circuit layer includes a signal line extending from the display area to the routing area, and the conductive layer includes a connecting line extending from the bending area to the routing area, one end of the connecting line is exposed by the notch, and the other end of the connecting line is electrically connected to the signal line through the via.

[0008] Optionally, the display module further includes an external driving circuit, which includes a flexible circuit board, which is arranged on a side of the second substrate away from the driving circuit layer and is electrically connected to the connecting line exposed by the notch.

[0009] Optionally, the signal line includes a data signal line extending in a first direction, wherein the extending direction of the connection line is the same as that of the data signal line.

[0010] Optionally, the extending length of the flexible circuit board located within the notch in a second direction is the same as the extending length of the display area in the second direction, wherein the second direction is perpendicular to the first direction.

[0011] Optionally, one end of the flexible circuit board is electrically connected to the connection line exposed by the notch, the other end of the flexible circuit board is bent and fixed on the surface of the first substrate facing away from the second substrate, and the notch penetrates through the first substrate in the second direction.

[0012] Optionally, anisotropic conductive adhesive is disposed within the notch, and the flexible circuit board is electrically connected to the connection line exposed by the notch through the anisotropic conductive adhesive.

[0013] Optionally, the first substrate and the second substrate are made of the same material.

[0014] Optionally, both the first substrate and the second substrate are made of polyimide.

[0015] Optionally, the display panel further includes a light-emitting functional layer disposed on the driving circuit layer and a packaging layer disposed on the light-emitting functional layer, and the packaging layer extends from the display area to the routing area.

[0016] Optionally, one edge of the notch is flush with one boundary of the packaging layer.

[0017] The present application provides a display module, which includes a first substrate having a notch disposed in a bending area. The notch is used to expose a connection line that is electrically connected to a signal line, so that an external driving circuit can be electrically connected to the signal line through the connection line, ensuring normal display of the display panel and avoiding the problem of a relatively large lower border width caused by setting fanout traces, achieving an ultra-narrow border; meanwhile, since the notch is disposed in the bending area and on the side of the second substrate facing away from the driving circuit layer, the film layer structure in the bending area can be simplified, the bending performance in the bending area can be improved, and the bending radius can be reduced. Description of the Drawings

[0018] Figure 1 is a first schematic structural diagram of the display module provided in the first embodiment of the present application;

[0019] Figure 2 is a second schematic structural diagram of the display module provided in the first embodiment of the present application;

[0020] Figure 3 The first structural schematic diagram of the display module provided in the second embodiment of the present application;

[0021] Figure 4 The second structural schematic diagram of the display module provided in the second embodiment of the present application. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; and "inner" and "outer" refer to the outline of the device.

[0023] The following disclosure provides many different implementation manners or examples to implement different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various implementation manners and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials. The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments.

[0024] Embodiment 1

[0025] Figure 1 The first structural schematic diagram of the display module provided in the first embodiment of the present application. Refer to Figure 1, this application provides a display module, which includes a display panel 10. The display panel 10 has a display area a, a bending area c, and a wiring area b located between the display area a and the bending area c. The display panel 10 includes a first substrate 101, a conductive layer 102, a second substrate 103, and a driving circuit layer 104 that are sequentially stacked. Among them, the first substrate 101 forms a notch 01 in the bending area c, the second substrate 103 is provided with a via 02 in the wiring area b, the driving circuit layer 104 includes a signal line 03 extending from the display area a to the wiring area b, the conductive layer 102 includes a connection line 04 extending from the bending area c to the wiring area b, one end of the connection line 04 is exposed by the notch 01, and the other end of the connection line 04 is electrically connected to the signal line 03 through the via 02.

[0026] In this application, a connection line 04 electrically connected to the signal line 03 is provided between the two substrates, and a notch 01 exposing the connection line 04 is provided on the second substrate 103 in the bending area c, so that an external circuit can smoothly transmit an electrical signal to the display area a of the display panel 10 through the connection line 04. While ensuring the display effect, the wiring layout of the wiring area is optimized, and the problem of a relatively large lower border width caused by setting fanout traces in the prior art can be avoided. Moreover, the problem of an increased film layer thickness and a relatively large bending radius in the bending area 03 caused by directly extending the signal line 03 provided on the side of the second substrate 103 facing away from the first substrate 101 from the display area a to the bending area c can be avoided, further narrowing the lower border width of the display panel 10 and improving the screen-to-body ratio.

[0027] In this embodiment, the display panel 10 is, for example, a flexible OLED display panel, but this application does not limit the type of the display panel 10. In other embodiments of this application, the display panel 10 can also be a flexible LCD display panel, a flexible Mini-LED display panel, or a flexible Micro-LED display panel.

[0028] In this embodiment, the display panel 10 has a display area a, a bending area c, and a wiring area b located between the display area a and the bending area c. The display area a has a light-emitting side and a backlight side. Pixel units for performing display functions are provided on the light-emitting side of the display area a; one end of the bending area c is connected to the display area a through the wiring area b, and the other end of the bending area c can be bent and fixed to the backlight side of the display area a, thereby narrowing the border width of the display panel 10; the wiring area b is used to set various traces capable of transmitting electrical signals, so that external electrical signals can smoothly be transmitted from the bending area c to the display area a, and then drive the pixel units in the display area a to perform display functions.

[0029] In this embodiment, the display panel 10 includes four border regions on the top, bottom, left, and right. Among them, the bending region c and the wiring region b are both located in the bottom border region, for example.

[0030] In this embodiment, the display panel 10 includes a first substrate 101, a conductive layer 102, a second substrate 103, and a driving circuit layer 104 that are sequentially stacked. Among them, the first substrate 101 forms a notch 01 in the bending region c, the second substrate 103 is provided with a via 02 in the wiring region b, the driving circuit layer 104 includes signal lines 03 extending from the display region a to the wiring region b, the conductive layer 102 includes connection lines 04 extending from the bending region c to the wiring region b, one end of the connection line 04 is exposed by the notch 01, and the other end of the connection line 04 is electrically connected to the signal line 03 through the via 02. The display panel in the prior art also includes a display region, a wiring region, and a bending region, but the signal lines in its driving circuit layer directly extend from the display region to the bending region. The wiring region b is provided with fanout traces, VDD traces, and VSS traces, and its film layer structure design is complex. The extension length of the fanout traces is relatively long, resulting in a larger width of the bottom border. In this application, the signal lines 03 for transmitting various electrical signals are uniformly electrically connected to various connection lines 04 arranged on the same layer through the vias 02 provided on the second substrate 103, and then through the notch 01 provided in the bending region c, the electrical connection between the external driving circuit and various signal lines 03 is realized, so that the wiring structure of the wiring region b can be optimized, and there is no need to perform a fan-out design on the wiring, reducing the border width of the display panel 10. In addition, since the signal lines 03 in the display region a are led out to the outside of the display panel through the connection lines 04 located on the back side of the display panel, the bending radius of the bending region c can be further reduced. And because the bending region c is provided with the notch 01, the film layer structure of the bending region c can be further simplified, and the bending performance of the bending region c can be improved.

[0031] In this embodiment, the number of the notches 01 is one or more, the number of the vias 02 is multiple, the number of the signal lines 03 is multiple, and the number of the connection lines 04 is multiple.

[0032] In this embodiment, the display module further includes an external driving circuit, and the functions of the external driving circuit include transmitting electrical signals to various signal lines 03 in the display area a. The external driving circuit can be a chip-on-film including a flexible circuit board 20, or a combined structure of a printed circuit board and the flexible circuit board 20. Wherein, the flexible circuit board 20 is disposed on a side of the second substrate 103 away from the driving circuit layer 104 and is electrically connected to the connection line 04 exposed by the notch 01, that is, the flexible circuit board 20 is bound and electrically connected to the connection line 04 in the notch 01 of the bending area c. Since the flexible circuit board 20 has bendable performance, the bendable performance of the bending area c can be ensured; and compared with the design form of arranging the flexible circuit board 20 on the display side in the prior art, the bending radius of the bending area c can be further reduced to further narrow the frame width of the display panel 10.

[0033] In this embodiment, data signal lines (DATA lines) and scan signal lines (SCAN lines) are arranged in a crisscross pattern in the display area a. The data signal lines 03 extend along a first direction X, and the scan signal lines 03 extend along a second direction, wherein the first direction X is perpendicular to the second direction.

[0034] In this embodiment, the signal line 03 includes a data signal line 03 extending along the first direction X, and the extending direction of the connection line 04 is the same as that of the data signal line 03, that is, the connection line 04 also extends along the first direction X. Since the extending directions of all the connection lines 04 are the same, all the signal lines 03 in the display area a can be led out by the connection line 04 along the first direction X, thereby optimizing the circuit layout in the wiring area b, avoiding the fan-out design of the wiring, and greatly reducing the extending length of the wiring area b in the first direction X.

[0035] Correspondingly, the flexible circuit board 20 includes a first part located in the notch 01 and electrically connected to the connection line 04 and a second part extending outside the notch 01. Wherein, the extending length of the first part in the second direction is the same as the extending length of the display area a in the second direction, that is, the extending length of the flexible circuit board 20 located in the notch 01 in the second direction is the same as the extending length of the display area a in the second direction.

[0036] In this embodiment, one end of the flexible circuit board 20 is electrically connected to the connection line 04 exposed by the notch 01, and the other end of the flexible circuit board 20 is bent and fixed on the surface of the first substrate 101 away from the second substrate 103. Specifically, the bending center of the flexible circuit board 20 is located at the junction of the flexible circuit board 20 and the AA line.

[0037] In this embodiment, the first substrate 101 has a first region overlapping the second substrate 103 and a second region missing relative to the second substrate 103. The first region corresponds to a partial region in the bending region c, the wiring region b, and the display region a, and the second region is formed with the notch 01. The extension length of the notch 01 in the first direction X is less than the extension length of the bending region c in the first direction X; the extension length of the notch 01 in the second direction is equal to the extension length of the bending region c in the second direction and greater than the extension length of the display region a in the second direction. That is, the area of the notch 01 is smaller than the area of the bending region c. Side walls are formed on both sides of the notch 01 in the first direction X, and the notch 01 penetrates the first substrate 101 in the second direction. Moreover, since the notch 01 penetrates the first substrate 101 in the second direction, the bending difficulty of the bending region c of the display panel 10 can be further reduced, and the bending performance can be improved.

[0038] In this embodiment, the flexible circuit board 20 is electrically connected to the connection line 04 through an anisotropic conductive adhesive. Specifically, the anisotropic conductive adhesive is disposed in the notch 01, and the flexible circuit board 20 is electrically connected to the connection line 04 exposed by the notch 01 through the anisotropic conductive adhesive.

[0039] In this embodiment, the material of the first substrate 101 is the same as that of the second substrate 103, and both are materials with flexible and bendable properties. Since the materials of the first substrate 101 and the second substrate 103 are the same, the types of materials can be reduced, and the manufacturing cost of the display panel 10 can be lowered. Preferably, the materials of the first substrate 101 and the second substrate 103 are both polyimide (PI). Of course, the present application does not limit the materials of the first substrate 101 and the second substrate 103. In other embodiments of the present application, the materials of the first substrate 101 and the second substrate 103 may also be at least one of polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), polyethylene (PE), polymethyl methacrylate (PMMA), polycarbonate resin (PC), and polypropylene (PP).

[0040] Figure 2 This is the second structural schematic diagram of the display module provided in the first embodiment of the present application. Refer to Figure 2, the display panel 10 includes, for example, a first substrate 101, a conductive layer 102, a second substrate 103, a buffer layer 105, a driving circuit layer 104, and a planarization layer 107 that are sequentially stacked. Among them, the driving circuit layer 104 includes thin film transistors, capacitors, various signal lines 03, and various insulating layers 106 including a gate insulating layer and an interlayer dielectric layer. The display panel 10 further includes a pixel definition layer 108, pixel units 109, and a packaging layer 113 disposed on the planarization layer 107. Among them, the pixel definition layer 108 is formed with a plurality of pixel definition openings. The pixel unit 109 includes a first electrode 110, a second electrode 112, and a light-emitting functional layer 111 located between the first electrode 110 and the second electrode 112. The packaging layer 113 includes a first inorganic packaging layer 114, a second organic packaging layer 115, and a third inorganic packaging layer 116.

[0041] In this embodiment, the packaging layer 113 is used to seal the pixel unit 109 to prevent external water and oxygen from invading the inside of the display panel 10 and affecting the normal display of the display panel 10. Among them, the packaging layer 113 extends from the display area a to the wiring area b. That is, the packaging layer 113 is located in the display area a and the wiring area b. One edge of the packaging layer 113 is the boundary between the wiring area b and the bending area c. Since the notch 01 is located in the bending area c outside the packaging area, the process difficulty of forming the notch 01 can be reduced. Further, one edge of the notch 01 is the boundary between the wiring area b and the bending area c, that is, one edge of the notch 01 is flush with one boundary of the packaging layer 113.

[0042] In this embodiment, the notch 01 can be formed by a laser drilling process. Since the notch 01 is located in the bending area c where the packaging layer 113 is not provided, that is, outside the packaging area, the precision requirement of the laser drilling process can be reduced.

[0043] Embodiment Two

[0044] Figure 3 is a first schematic structural diagram of the display module provided by the second embodiment of the present application; Figure 4 is a second schematic structural diagram of the display module provided by the second embodiment of the present application. Combining Figure 3 and Figure 4As shown in the figure, Embodiment 2 of the present application provides a display module. The display module includes a first substrate 101, a conductive layer 102, a second substrate 103, a buffer layer 105, a driving circuit layer 104, a planarization layer 107, which are stacked in sequence, and a pixel definition layer 108, a pixel unit 109, and a packaging layer 113 disposed on the planarization layer 107. Among them, the first substrate 101 has a notch 01 formed in the bending area c, the second substrate 103 is provided with a via 02 in the wiring area b, the driving circuit layer 104 includes a signal line 03 extending from the display area a to the wiring area b, the conductive layer 102 includes a connection line 04 extending from the bending area c to the wiring area b, one end of the connection line 04 is exposed by the notch 01, and the other end of the connection line 04 is electrically connected to the signal line 03 through the via 02.

[0045] The structure of the display module provided in Embodiment 2 of the present application is similar to the structure of the display module provided in Embodiment 1 of the present application. The same parts of the present application will not be described in detail. The difference is that in this embodiment, the first substrate 101 has a first region overlapping with the second substrate 103 and a second region missing relative to the second substrate 103. The first region corresponds to the wiring area b and the display area a, and the second region corresponds to the formation of the notch 01. The extension length of the notch 01 in the first direction X is equal to the extension length of the bending area c in the first direction X; the extension length of the notch 01 in the second direction is equal to the extension length of the bending area c in the second direction and is equal to the extension length of the display area a in the second direction. That is, the area of the notch 01 is equal to the area of the bending area c. The notch 01 has a side wall only on one side close to the wiring area b in the first direction X, and the notch 01 penetrates the first substrate 101 in the second direction.

[0046] In summary, the present application provides a display module, the display module includes a display panel, the display panel has a display area, a bending area, and a wiring area located between the display area and the bending area. The display panel includes a first substrate, a conductive layer, a second substrate, and a driving circuit layer that are sequentially stacked. Among them, the first substrate forms a notch in the bending area, the second substrate is provided with vias in the wiring area, the driving circuit layer includes signal lines extending from the display area to the wiring area, the conductive layer includes connection lines extending from the bending area to the wiring area, one end of the connection line is exposed by the notch, and the other end of the connection line is electrically connected to the signal line through the via. By providing a connection line electrically connected to the signal line between the two substrates and providing a notch exposing the connection line on the first substrate in the bending area, the present application enables an external circuit to transmit an electrical signal to the display area through the connection line, while ensuring the display effect, narrowing the width of the lower border of the display panel, and increasing the screen-to-body ratio.

[0047] The above has introduced in detail a display module provided by an embodiment of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A display module, comprising a display panel, characterized in that, The display panel comprises a display area, a bending area, and a wiring area between the display area and the bending area. The display panel comprises a first substrate, a conductive layer, a second substrate, and a driving circuit layer which are stacked in sequence. The first substrate is provided with a notch in the bending area, the second substrate is provided with a via in the routing area, the driving circuit layer includes a signal line extending from the display area to the routing area, the conductive layer includes a connecting line extending from the bending area to the routing area, one end of the connecting line is exposed by the notch, and the other end of the connecting line is electrically connected to the signal line through the via; The display module also includes an external driving circuit, which includes a flexible circuit board. The flexible circuit board is arranged on a side of the conductive layer away from the second substrate and is electrically connected to the connecting line exposed by the notch. One end of the flexible circuit board connected to the connecting line is located in the bending area.

2. The display module according to claim 1, wherein The signal line includes a data signal line extending along a first direction, wherein the extending direction of the connection line is the same as the extending direction of the data signal line.

3. The display module according to claim 2, wherein An extension length of the flexible circuit board in the notch in a second direction is the same as an extension length of the display area in the second direction, wherein the second direction is perpendicular to the first direction.

4. The display module according to claim 3, characterized in that, One end of the flexible circuit board is electrically connected to the connection line exposed by the notch, the other end of the flexible circuit board is bent and fixed on the surface of the first substrate facing away from the second substrate, and the notch penetrates the first substrate in the second direction.

5. The display module according to claim 1, wherein Anisotropic conductive adhesive is arranged in the notch, and the flexible circuit board is electrically connected to the connecting wire exposed by the notch through the anisotropic conductive adhesive.

6. The display module according to claim 1, wherein The first substrate and the second substrate are made of the same material.

7. The display module according to claim 6, wherein The first substrate and the second substrate are both made of polyimide.

8. The display module according to claim 1, wherein, The display panel further includes a light-emitting functional layer disposed on the driving circuit layer and a packaging layer disposed on the light-emitting functional layer, wherein the packaging layer extends from the display area to the wiring area.

9. The display module according to claim 8, wherein An edge of the notch is flush with a border of the packaging layer.

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