Display module and display device

Abstract

The application provides a display module and a display device. The display module includes a body part and an extension part. The body part is attached to a first support part and a second support part. A first cavity is formed between the body part, the first support part, a circuit board and a flexible circuit board. The extension part extends from the body part to the circuit board. At least part of the extension part is arranged near an end opening of the first cavity. The extension part is formed by extending the body part outward. A corrosive liquid needs to pass through the extension part before invading the joint between the flexible circuit board and the display panel. The length of the invasion path of the corrosive liquid is increased. The risk of corrosion of the metal circuit on the display panel is reduced. The problem of functional failure caused by corrosion of the metal circuit during sweat or salt spray experiments of the display module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display module and a display device. BACKGROUND

[0002] The design space of high-end flagship products of tablet computers and notebook computers is limited, which causes the demand for the thickness of the display module to be ultra-thin. In addition, high resolution (PPI) and high refresh rate are also strong demands of the consumer market. Therefore, the bonding area of the flexible printed circuit board (FPC) and the display panel and the width of the printed circuit board (PCBA) are increased, which reduces the edge distance between the bonding area and the printed circuit board and the edge of the display module. As a result, the size of the insulating protective member (Tape) attached to the surface of the display panel of the bonding area and the printed circuit board is limited, and the insulating protective member cannot completely wrap the bonding area, thereby reducing the corrosion resistance of the display module. In the sweat or salt spray test, metal lines may be corroded, resulting in functional defects. SUMMARY

[0003] The present application provides a display module and a display device to alleviate the technical problem that metal lines are corroded in the sweat or salt spray test of the display module, resulting in functional defects.

[0004] To solve the above problems, the technical scheme provided by the present application is as follows:

[0005] The present application provides a display module, which comprises:

[0006] a display panel, the display panel comprising a first planar portion, a second planar portion, and a bending portion connecting the first planar portion and the second planar portion, the second planar portion being bent to the back side of the first planar portion through the bending portion;

[0007] a support member arranged on the back side of the display panel, the support member comprising a first support portion corresponding to the first planar portion and a second support portion corresponding to the second planar portion;

[0008] a heightening member arranged between the first support portion and the second support portion and opposite to the bending portion;

[0009] a circuit board arranged on the side of the first support portion away from the first planar portion and on the side of the heightening member away from the bending portion;

[0010] a flexible printed circuit board connected between the second planar portion and the circuit board;

[0011] The cushioning piece includes a body portion and an extension portion. The body portion is attached to the first support portion and the second support portion. A first cavity is formed between the body portion, the first support portion, the circuit board and the flexible circuit board. The extension portion extends from the body portion to the circuit board. At least a portion of the extension portion is arranged near an end opening of the first cavity.

[0012] In the display module provided in the embodiments of the present application, the extension portion includes a first extension sub-portion. The first extension sub-portion is arranged outside the first cavity and near the first cavity. A projection of the first extension sub-portion on the first support portion is outside a projection of the flexible circuit board on the first support portion.

[0013] In the display module provided in the embodiments of the present application, the extension portion further includes a second extension sub-portion connected to the first extension sub-portion. The second extension sub-portion is arranged in the first cavity. A projection of the second extension sub-portion on the first support portion is inside a projection of the flexible circuit board on the first support portion.

[0014] In the display module provided in the embodiments of the present application, the display module further includes a sealing member arranged at a joint of the flexible circuit board and the second planar portion. The sealing member is arranged in the first cavity. The second extension sub-portion is provided with a notch at a position corresponding to the sealing member.

[0015] In the display module provided in the embodiments of the present application, the flexible circuit board includes a bending portion arranged near the circuit board. An end of the extension portion is arranged near a starting end of the bending portion.

[0016] In the display module provided in the embodiments of the present application, the cushioning piece includes at least one base material layer and first and second adhesive layers arranged on a surface of the base material layer. The base material layer is attached to the first support portion through one of the first and second adhesive layers. The base material layer is attached to the second support portion through the other of the first and second adhesive layers.

[0017] In the display module provided in the embodiments of the present application, a material of the base material layer includes polyethylene terephthalate. Materials of the first and second adhesive layers include pressure-sensitive adhesive.

[0018] In the display module provided in the embodiments of the present application, the display module further includes an auxiliary member arranged on a side of the extension portion away from the first support portion. A projection of the auxiliary member on the first support portion is on a projection of the extension portion on the first support portion.

[0019] In the display module provided in the embodiments of the present application, the display module further comprises an insulating protective member covering the second planar part, the flexible circuit board and the circuit board, and the insulating protective member is attached to part of the auxiliary member.

[0020] In the display module provided in the embodiments of the present application, the auxiliary member comprises at least one third adhesive layer, and the material of the third adhesive layer comprises pressure-sensitive adhesive.

[0021] The embodiments of the present application further provide a display device comprising the display module of any one of the foregoing embodiments.

[0022] The display module and the display device provided in the present application have the following beneficial effects: in the display module and the display device provided in the present application, the cushioning member on the display module comprises a body part and an extension part, the body part is attached to the first support part and the second support part, a first cavity is formed between the body part, the first support part, the circuit board and the flexible circuit board, the extension part extends from the body part to the circuit board, and at least part of the extension part is arranged at the end opening close to the first cavity. By extending the cushioning member to form the extension part, the corrosive liquid needs to pass through the extension part before invading the joint between the flexible circuit board and the display panel, thereby increasing the length of the invasion path of the corrosive liquid and reducing the risk of corrosion of the metal circuit on the display panel, so as to improve the problem of functional failure caused by corrosion of the metal circuit when the display module is subjected to sweat or salt spray test. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0024] Figure 1 FIG. 1 shows a planar structure schematic diagram of a display module.

[0025] Figure 2 FIG. 2 shows a schematic diagram of a display module after an insulating protective film is attached to the display module. Figure 1

[0026] FIG. 3 shows a schematic diagram of a display module after a corrosive liquid is locally gathered on the display module. Figure 3 Figure 1 FIG. 4 shows a simplified structure schematic diagram of a film layer of a display module.

[0027] Figure 4 Figure 3 FIG. 5 shows a simplified structure schematic diagram of a film layer of a display module.

[0028] Figure 5 ​​A partial structure schematic diagram of a display module provided by an embodiment of the present application.

[0029] Figure 6 Another partial structure schematic diagram of a display module provided by an embodiment of the present application.

[0030] Figure 7 For Figure 6 A cross-sectional structure schematic diagram in the direction of N-N'.

[0031] Figure 8 For Figure 6 A partial simplified structure schematic diagram of a display module.

[0032] Figure 9 Another partial structure schematic diagram of a display module provided by an embodiment of the present application.

[0033] Figure 10 For Figure 9 A partial simplified structure schematic diagram of a display module.

[0034] Figure 11 Another partial structure schematic diagram of a display module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0035] The following description of the embodiments refers to the accompanying drawings, which are intended to facilitate a better understanding in which reference characters indicate like or similar elements as throughout the drawings. The direction terms used in the present application, such as [up], [down], [front], [back], [left], [right], [inward], [outward], [side], etc., are only used to refer to the directions in the accompanying drawings. Accordingly, the direction terms are used to explain and understand the present application, not to limit the present application. In the drawings, similar elements are designated with like reference numerals. In the drawings, the thicknesses of some layers and regions are exaggerated for clarity and convenience of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited thereto.

[0036] In view of the problem of metal circuit corrosion and formation of poor functionality of the display module in a sweat or salt spray experiment, the inventors of the present application found in research that, referring to Figures 1 to 4 , Figure 1 A planar structure schematic diagram of a display module is shown, Figure 2 For Figure 1 A schematic diagram of the display module after attaching an insulating protective film, Figure 3 For Figure 1 A detailed schematic diagram of the display module locally gathering corrosive liquid, Figure 4 For Figure 3 A partial simplified structure schematic diagram of the display module, referring to Figure 1The display module 100' includes a display panel 10', a support 20', a circuit board 40', a flexible circuit board 50', and a driving integrated circuit (IC) 60'. The flexible circuit board 50' is connected between the display panel 10' and the circuit board 40'. The driving IC is bonded on the display panel 10'. The support 20' is used to support the display panel 10'.

[0037] In order to realize high resolution (PPI) and high refresh rate, the width of the bonding area of the flexible circuit board 50' and the display panel 10' on the display module 100' and the circuit board 40' is increased, and the edge distance L' of the bonding area and the circuit board 40' from the border of the display module 100' is reduced. Referring to Figure 2 Due to the reduction of the edge distance L', the size of the insulating protective member 70' attached to the surface of the display panel 10' in the bonding area and the circuit board 40' is limited, and the insulating protective member 70' cannot completely wrap the bonding area. Referring to Figure 3 and Figure 4 Due to the fact that the insulating protective member 70' cannot completely wrap the bonding area, the corrosion resistance of the display module 100' is reduced. In the sweat or salt spray test, the corrosive liquid CL will gather on the side of the bonding area, and the corrosive liquid CL will form a siphon effect from the small gap on the side into the bonding area, causing the metal lines on the display panel 10' to corrode and form a functional defect.

[0038] Therefore, the present application provides a display module and a display device to improve the problem of metal line corrosion and functional defect in the sweat or salt spray test of the display module.

[0039] Please refer to Figures 1 to 8 , Figure 5 A partial structure schematic diagram of the display module provided by the embodiment of the present application is shown in Figure 6 Another partial structure schematic diagram of the display module provided by the embodiment of the present application is shown in Figure 7 is Figure 6 is a cross-sectional structure schematic diagram along the N-N' direction in Figure 8 is Figure 6 is a partial simplified structure schematic diagram of the display module in Figure 5 and Figure 3 The difference between and is that: Figure 5 The heightening member 30 is shown, and the heightening member 30 is designed to be outwardly expanded, Figure 6 and Figure 5 The difference between and is that: Figure 6 An auxiliary member 80 is arranged on the outwardly expanded part of the heightening member 30, and therefore, Figure 5 and Figure 6 The overall structure schematic diagram of and can be referred toFigure 3 Overall structural schematic diagram of the display module Figure 1 , Figure 5 Membrane layer structure schematic diagram of the display module Figure 6 Membrane layer structure schematic diagram of the display module Figure 7 .

[0040] In combination with reference to Figure 5 and Figure 7 , the display module 100 includes a display panel 10, a support 20, a cushioning member 30, a circuit board 40, and a flexible circuit board 50. The display panel 10 has opposite light-emitting and back sides, and includes a first planar portion 11, a second planar portion 12, and a bending portion 13 connected between the first planar portion 11 and the second planar portion 12, the second planar portion 12 being bent to the back side of the first planar portion 11 through the bending portion 13. A protection portion 14 is arranged on the bending portion 13, and is used to protect the circuit on the bending portion 13. The display panel 10 includes a flexible organic light emitting diode (OLED) display panel 10, etc. When the display panel 10 is a flexible OLED display panel 10, the display panel 10 can include a substrate, and a driving circuit layer, a light-emitting functional layer, and an encapsulation layer sequentially stacked on the substrate. The driving circuit layer is provided with a driving circuit, the light-emitting functional layer is provided with a light-emitting device, the driving circuit is used to drive the light-emitting device to emit light, and the encapsulation layer is used to protect the light-emitting device and avoid water and oxygen from invading to cause the light-emitting device to fail. The flexible OLED display panel 10 has a flexible characteristic, so that the display panel 10 can be bent or folded, and then the binding area of the display panel 10 can be folded to the back side of the display panel 10 to achieve a narrow frame.

[0041] The support 20 is arranged on the back side of the display panel 10, which is opposite to the light-emitting side. The light-emitting side refers to the side of the display module 100 on which the display screen is displayed. The support 20 includes a first support portion 21 corresponding to the first planar portion 11 and a second support portion 22 corresponding to the second planar portion 12, so as to integrally support the display panel 10. Optionally, the support 20 can include a first support layer, a buffer layer and a second support layer arranged in layers. The material of the first support layer includes polyethylene terephthalate (PET) or the like. The first support layer is arranged in two sections at the positions corresponding to the bending portion 13, one section corresponding to the first planar portion 11 and the other section corresponding to the second planar portion 12. The material of the buffer layer includes foam or polyimide or the like. The buffer layer is arranged corresponding to the first planar portion 11 but not corresponding to the second planar portion 12. The material of the second support layer includes metal material such as stainless steel. The second support layer is arranged corresponding to the first planar portion 11 but not corresponding to the second planar portion 12. That is, the first support portion 21 includes the first support layer, the buffer layer and the second support layer arranged in layers, while the second support portion 22 includes the first support layer but does not include the buffer layer and the second support layer.

[0042] The cushioning member 30 is arranged between the first support portion 21 and the second support portion 22 and opposite to the bending portion 13. The circuit board 40 is arranged away from the first planar portion 11 on the side of the first support portion 21 and away from the bending portion 13 on the side of the cushioning member 30. The circuit board 40 is a printed circuit board assembly (PCBA) provided with electronic components. The flexible circuit board 50 is connected between the second planar portion 12 and the circuit board 40. The flexible circuit board 50 is a flexible printed circuit (FPC). One end of the flexible circuit board 50 is bound to the second planar portion 12 of the display panel 10, and the other end is bound to the circuit board 40. The driving integrated circuit 60 (IC) is also bound to the second planar portion 12 of the display panel 10 and is arranged spaced apart from the flexible circuit board 40. Of course, in other embodiments, the driving integrated circuit 60 can also be bound to the flexible circuit board 50.

[0043] The cushioning piece 30 comprises a body part 31 and an extension part 32. The body part 31 is attached to the first support part 21 and the second support part 22. The body part 31, the first support part 21, the circuit board 40 and the flexible circuit board 50 form a first cavity 501. The extension part 32 extends from the body part 31 to the circuit board 40. At least part of the extension part 32 is arranged near the opening of the first cavity 501. By extending the cushioning piece 30 to form the extension part 32, corrosive liquid needs to pass through the extension part 32 before it reaches the joint between the flexible circuit board 50 and the display panel 10. Thus, the length of the corrosive liquid invasion path is increased, and the risk of corrosion of the metal circuit on the display panel 10 is reduced, thereby improving the problem of functional failure caused by corrosion of the metal circuit in the sweat or salt spray test of the display module 100.

[0044] Specifically, the cushioning piece 30 has a second gap with the bending part 13. The cushioning piece 30 is used to make the bending part 13 form a bending arc with a certain angle, so as to avoid the breakage of the circuit in the bending part 13. Meanwhile, the cushioning piece 30 is also used to fix the second planar part 12 on the first support part 21. Optionally, the cushioning piece 30 comprises at least one substrate layer and a first adhesive layer and a second adhesive layer on the surface of the substrate layer. The substrate layer is attached to the first support part 21 through one of the first adhesive layer and the second adhesive layer, and the substrate layer is attached to the second support part 22 through the other of the first adhesive layer and the second adhesive layer. The material of the substrate layer comprises polyethylene terephthalate, etc. The material of the first adhesive layer and the second adhesive layer comprises pressure sensitive adhesive (PSA), etc.

[0045] Continuing to refer to Figure 5 , the extension part 32 comprises a first extension sub-part 321 and a second extension sub-part 322 connected to the first extension sub-part 321. The first extension sub-part 321 is located outside the first cavity 501 and arranged near the first cavity 501. The orthographic projection of the first extension sub-part 321 on the first support part 21 is located outside the orthographic projection of the flexible circuit board 50 on the first support part 21. The second extension sub-part 322 is located in the first cavity 501. The orthographic projection of the second extension sub-part 322 on the first support part 21 is located inside the orthographic projection of the flexible circuit board 50 on the first support part 21.

[0046] Optionally, the flexible circuit board 50 comprises a bending part 51 arranged close to the circuit board 40, and the end of the extension part 32 is close to the starting end of the bending part 51, for example, flush with the starting end of the bending part 51, so that a certain distance is reserved between the extension part 32 and the circuit board 40, avoiding the extension part 32 affecting the binding of the flexible circuit board 50 and the circuit board 40.

[0047] In an embodiment, referring to Figure 6 , the display module 100 further comprises an auxiliary member 80 arranged on the side of the extension part 32 away from the first support part 21, and the orthogonal projection of the auxiliary member 80 on the first support part 21 is located on the orthogonal projection of the extension part 32 on the first support part 21. The auxiliary member 80 is attached between the extension part 32 and the flexible circuit board 50, used to fix the flexible circuit board 50 with the extension part 32, and the auxiliary member 80 can also fill the gap between the flexible circuit board 50 and the extension part 32, to further block the corrosive liquid. Referring to Figure 8 , in this way, the corrosive liquid needs to pass through the extension part 32 and the auxiliary member 80 before invading the joint of the flexible circuit board 50 and the display panel 10, so as to further increase the length of the invasion path of the corrosive liquid, further reduce the risk of corrosion of the metal circuit on the display panel 10, and improve the problem of functional failure caused by corrosion of the metal circuit in the sweat or salt spray experiment of the display module 100. In the drawings of the present application, the invasion path of the corrosive liquid is shown by a dashed line with an arrow.

[0048] Optionally, the auxiliary member 80 comprises at least one third adhesive layer, and the material of the third adhesive layer comprises pressure-sensitive adhesive or the like.

[0049] Of course, the display module 100 further comprises an insulating protective member 70 covering the second planar part 12, the flexible circuit board 50 and the circuit board 40, and the insulating protective member 70 is attached to part of the auxiliary member 80. Specifically, the insulating protective member 70 can be attached to the auxiliary member 80 above the first extension sub-part 321, to enhance the stability of the attachment of the insulating protective member 70 on the second planar part 12, the flexible circuit board 50 and the circuit board 40.

[0050] Optionally, continuing to refer to Figure 7 , the display module 100 further comprises a polarizer 15 and a cover plate 16 arranged on the light-emitting side of the display panel 10, and the cover plate 16 is attached to the polarizer 15 through a fourth adhesive layer 17. The material of the fourth adhesive layer 17 comprises transparent optical adhesive, such as OCA adhesive or the like.

[0051] In an embodiment, referring toFigures 1 to 10 , Figure 9 This is a schematic diagram of another partial structure of the display module provided in an embodiment of this application. Figure 10 for Figure 9 A simplified structural diagram of a portion of the display module. (Refer to...) Figure 9 and Figure 10 ,and Figure 6 The difference in the example display module 100 is that it further includes a sealing member 90 disposed at the junction of the flexible circuit board 50 and the second planar portion 12. The sealing member 90 is located within the first cavity 501, and the second extension portion 322 has a notch at a position corresponding to the sealing member 90 to prevent interference between the second extension portion 32 and the sealing member 90. The material of the sealing member 90 includes sealant, etc. Other details are provided in the above embodiment and will not be repeated here.

[0052] In one embodiment, reference is made to... Figures 1 to 11 , Figure 11 This is a partial structural diagram of the display module provided in an embodiment of this application. (Refer to...) Figure 11 ,and Figure 6 The difference in the example display module 100 is that the extension portion 32 is entirely located outside the first cavity 501. That is, the extension portion 32 includes the first extension sub-portion 321 but does not include the second extension sub-portion 322, in order to avoid interference between the second extension sub-portion 322 and the seal 90. Other descriptions are as described in the above embodiments and will not be repeated here.

[0053] Based on the same inventive concept, this application also provides a display device, which includes the display module 100 described in one of the foregoing embodiments. The display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0054] As can be seen from the above embodiments:

[0055] The display module and the display device provided by the application, the heightening piece on the display module comprises a body part and an extension part, the body part is attached to the first support part and the second support part, a first cavity is formed between the body part, the first support part, the circuit board and the flexible circuit board, the extension part extends from the body part to the circuit board, at least part of the extension part is arranged near the opening of the first cavity on both sides, by extending the heightening piece to form the extension part, the corrosive liquid needs to pass through the extension part before invading the joint of the flexible circuit board and the display panel, thereby the length of the invasion path of the corrosive liquid can be increased, the risk of the metal circuit on the display panel being corroded can be reduced, and the problem of forming a bad function caused by the corrosion of the metal circuit when the display module is subjected to the sweat or salt spray experiment can be improved.

[0056] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0057] The above describes the embodiments of the application in detail, and the principle and implementation mode of the application are described by applying specific examples; the above description of the embodiments is only used to help understand the technical solutions and the core idea of the application; the person skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A display module, characterized by The display module comprises: a display panel comprising a first planar portion, a second planar portion, and a bending portion connecting the first planar portion and the second planar portion, the second planar portion being bent to the back side of the first planar portion through the bending portion; a support member arranged on the back side of the display panel, the support member comprising a first support portion corresponding to the first planar portion, and a second support portion corresponding to the second planar portion; a spacer arranged between the first support portion and the second support portion, and arranged opposite to the bending portion; a circuit board arranged on the side of the first support portion away from the first planar portion, and located on the side of the spacer away from the bending portion; a flexible circuit board connecting the second planar portion and the circuit board; wherein the spacer comprises a body portion and an extension portion, the body portion is attached to the first support portion and the second support portion, the body portion and the first support portion, the circuit board and the flexible circuit board form a first cavity, the extension portion extends from the body portion to the circuit board, at least part of the extension portion is arranged near the end opening of the first cavity; the extension portion comprises a first extension sub-portion, the first extension sub-portion is located outside the first cavity and arranged near the first cavity, the orthographic projection of the first extension sub-portion on the first support portion is located outside the orthographic projection of the flexible circuit board on the first support portion; an auxiliary member arranged on the side of the extension portion away from the first support portion, the orthographic projection of the auxiliary member on the first support portion is located on the orthographic projection of the extension portion on the first support portion, the auxiliary member is attached between the extension portion and the flexible circuit board and fills the gap between the flexible circuit board and the extension portion; an insulating protective member covering the second planar portion, the flexible circuit board and the circuit board, the insulating protective member is attached to the auxiliary member above the first extension sub-portion to enhance the stability of the attachment of the insulating protective member on the second planar portion, the flexible circuit board and the circuit board.

2. The display module of claim 1, wherein, The extension portion further comprises a second extension sub-portion connected to the first extension sub-portion, the second extension sub-portion is located in the first cavity, the orthographic projection of the second extension sub-portion on the first support portion is located within the orthographic projection of the flexible circuit board on the first support portion.

3. The display module of claim 2, wherein, The display module further comprises a sealing member arranged at the joint of the flexible circuit board and the second planar portion, the sealing member is located in the first cavity, the second extension sub-portion is provided with a notch at a position corresponding to the sealing member.

4. The display module of claim 1, wherein, The flexible circuit board comprises a bending portion arranged near the circuit board, the end of the extension portion is near the starting end of the bending portion.

5. The display module of claim 1, wherein, The spacer comprises at least one substrate layer and a first adhesive layer and a second adhesive layer on the surface of the substrate layer, the substrate layer is attached to the first support portion through one of the first adhesive layer and the second adhesive layer, and the substrate layer is attached to the second support portion through the other of the first adhesive layer and the second adhesive layer.

6. The display module of claim 5, wherein, The material of the substrate layer comprises polyethylene terephthalate, and the material of the first adhesive layer and the second adhesive layer comprises pressure-sensitive adhesive.

7. The display module of claim 1, wherein, The auxiliary member comprises at least one third adhesive layer, and the material of the third adhesive layer comprises pressure-sensitive adhesive.

8. A display device, characterized by comprising: The display module comprises the display module as claimed in any one of claims 1 to 7.

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