CN114843417A

CN114843417A - Display module and display device

Info

Publication number: CN114843417A
Application number: CN202210405967.2A
Authority: CN
Inventors: 游魁华
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-08-02

Abstract

The application provides in a display module assembly and display device, this display module assembly includes display panel and range upon range of various rete, the optics that sets up on display panel in proper order and improves layer and protective layer. The display panel comprises a display area and a bending area adjacent to the display area, the color film layer at least corresponds to the display area, and the optical improvement layer extends to the bending area from the display area and covers the display panel of the bending area. The utility model provides a UV that current OLED display panel buckled the district is improved through the optics that sets up the whole layer and is replaced glues, and the optics that the whole layer set up improves and can not take place to interfere between layer and the protective layer to there is the problem that UV glues and apron interference in the district of buckling of alleviating current OLED display panel.

Description

Display module and display device

Technical Field

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

Background

For an Organic Light-Emitting Diode (OLED) display panel, the polarizer can effectively reduce the reflectivity of the OLED display panel under strong Light, but causes the OLED display panel to lose nearly 58% of the Light, which greatly increases the service life burden of the OLED display panel. In order to improve the light-emitting rate of the OLED display panel, a non-polarizer (POL-less) technology is generally used to manufacture the OLED display panel, and the POL-less technology refers to a technology that a Color Filter (CF) is used to replace a polarizer. The color film is composed of a red color resistor, a green color resistor, a blue color resistor and a Black Matrix (BM). In the OLED display panel, the red color resistor, the green color resistor and the blue color resistor respectively play roles in emitting light of the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit, and the black matrix mainly plays roles in preventing the OLED display panel from light leakage and reducing the reflectivity of the OLED display panel. The color film can reduce the reflectivity of the OLED display panel under strong light to a certain extent, and can improve the light-emitting rate of the OLED display panel from 42% to 60%. And the thickness of the color film is far smaller than that of the polarizer, the flexibility is high, the overall thickness of the OLED display panel can be reduced, and the development of dynamic bending products is facilitated.

Further, in order to implement a narrow bezel design of the OLED display panel, the bending region of the OLED display panel is generally bent to the back side of the OLED display panel, thereby reducing the width of the bezel. However, the bending of the bending region of the OLED display panel easily causes the circuit in the OLED display panel to break, and in order to prevent the circuit from breaking due to bending, the bending region of the OLED display panel is usually covered with UV glue to relieve the bending stress of the bending region of the OLED display panel. However, when the cover plate and the color film are bonded by the optical adhesive, the cover plate and the UV adhesive interfere with each other due to the thin thickness of the color film and the optical adhesive. And the thickness of the UV glue is difficult to be thinned again due to the limitation of the process technology.

Disclosure of Invention

The application provides a display module assembly and display device to there is the technical problem who interferes between UV glue and the apron in the district of buckling of alleviating current OLED display panel.

In order to solve the above problems, the technical solution provided by the present application is as follows:

the embodiment of the application provides a display module assembly, it includes:

the display panel comprises a display area and a bending area adjacent to the display area;

the color film layer is arranged on the display panel and at least corresponds to the display area;

the optical improvement layer is arranged on one side of the color film layer, which is far away from the display panel; and

the protective layer is arranged on one side, away from the color film layer, of the optical improvement layer;

wherein the optical improvement layer extends from the display area to the bending area and covers the display panel of the bending area.

In the display module assembly that this application embodiment provided, optics improves the layer and includes optics rete and tie coat the display area, optics rete passes through the tie coat is attached on the various rete, the protective layer is located optics rete is kept away from one side of tie coat.

In the display module assembly that this application embodiment provided, the thickness of optics rete is greater than the thickness of tie coat.

In the display module assembly that this application embodiment provided, the elastic modulus of optics rete is greater than the elastic modulus of tie coat.

In the display module provided in the embodiment of the application, the transmittance of the bonding layer ranges from 70% to 99%.

In the display module provided in the embodiment of the present application, the haze range of the bonding layer is 0.5% to 15%.

In the display module provided by the embodiment of the application, the thickness of the optical improvement layer is less than or equal to 100 micrometers.

In the display module provided by the embodiment of the application, the material of the optical film layer includes at least one of a thermoplastic polyurethane elastomer, polyurethane for short, and polyethylene terephthalate.

In the display module assembly that this application embodiment provided, display panel still includes and is located the bending zone is kept away from the bending extension district of display interval one side, optics improves the layer and still follows the bending zone extends to the bending extension district, just is in the bending extension district, optics improves the layer and is greater than or equal to 1 millimeter in the length along extending direction.

The embodiment of the application further provides a display device, which comprises a shell and the display module in one of the embodiments, wherein the shell is provided with an accommodating cavity, and the display module is assembled in the accommodating cavity.

The beneficial effect of this application does: in the display module assembly and the display device that this application provided, improve the layer through the optics that sets up the whole layer and replace the UV that current OLED display panel buckled the district and glue, the optics that the whole layer set up improves and can not take place to interfere between layer and the protective layer, and the district of buckling that has solved current OLED display panel has UV to glue and the problem of apron interference. And the optical improvement layer arranged on the whole layer is covered on the color film layer, so that the color separation problem of the display module can be improved.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a display module according to an embodiment of the present disclosure before being bent.

Fig. 2 is a schematic top view structure of a display panel before being bent according to an embodiment of the present disclosure.

Fig. 3 is a schematic cross-sectional view of a display module bent according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram illustrating a detailed structure of an optical improvement layer according to an embodiment of the present application.

Fig. 5 is a schematic cross-sectional view of a display device according to an embodiment of the present disclosure.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. Directional phrases used in this application, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is not intended to be limiting of the present application. In the drawings, elements having similar structures are denoted by the same reference numerals. In the drawings, the thickness of some layers and regions are exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily illustrated, but the present application is not limited thereto.

Referring to fig. 1 to 4, fig. 1 is a schematic cross-sectional structure of a display module provided in an embodiment of the present application before being bent, fig. 2 is a schematic top-view structure of a display panel provided in an embodiment of the present application before being bent, fig. 3 is a schematic cross-sectional structure of a display module provided in an embodiment of the present application after being bent, and fig. 4 is a schematic detail structure of an optical improvement layer provided in an embodiment of the present application. The display module 100 includes a display panel 10, and a color film layer 20, an optical improvement layer 30 and a protection layer 40 stacked on the display panel 10. The display panel 10 includes a display area AA, a bending area PB adjacent to the display area AA, and a bending extension area NB located on a side of the bending area PB away from the display area AA.

The display area AA of the display panel 10 refers to a portion of the display panel 10 for displaying a picture; the bending area PB is designed with fan-out wiring for connecting with signal wiring in the display area AA; the bending extension area NB refers to a portion of the display panel 10 for designing a binding trace, and is used for connecting with the printed circuit board 80.

The display panel 10 includes flexible display panels such as a flexible OLED display panel, and the flexible display panel can realize functions such as bending and curling. Therefore, the bending extension area NB can be bent to the non-light-emitting side of the display panel 10 through the bending area PB, so as to reduce the frame width of the display module 100, and realize a narrow frame or no frame. The non-light-emitting side of the display panel 10 is the side opposite to the light-emitting side of the display panel 10, the light-emitting side of the display panel 10 is the side of the display panel 10 displaying the picture, and the color film layer 20 is disposed on the light-emitting side of the display panel 10.

The color film layer 20 is disposed on the light emitting side of the display panel 10 and at least disposed corresponding to the display area AA, that is, a portion of the color film layer 20 may further extend from the display area AA to the bending area PB. The color film layer 20 is used to replace a polarizer and plays a role in preventing light leakage of the display module 100 and reducing the reflectivity of the display module 100.

Specifically, the display area AA of the display panel 10 includes a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit, wherein the red sub-pixel unit is configured to emit red light, the green sub-pixel unit is configured to emit green light, and the blue sub-pixel unit is configured to emit blue light. The color film layer 20 includes a plurality of color resistors and a Black Matrix (BM) disposed between different color resistors, where the plurality of color resistors includes a red color resistor, a green color resistor and a blue color resistor, where the red color resistor is disposed corresponding to the red sub-pixel unit, and the red color resistor is responsible for light emission of the red sub-pixel unit; the green color resistor is arranged corresponding to the green sub-pixel unit, and the green color resistor bears the light emitted by the green sub-pixel unit; the blue color resistor is arranged corresponding to the blue sub-pixel unit, and the blue color resistor bears the light emitted by the blue sub-pixel unit; the black matrix mainly plays a role in preventing the light leakage of the display module 100 and reducing the reflectivity of the display module 100.

The optical improvement layer 30 is disposed on a side of the color film layer 20 away from the display panel 10, and the optical improvement layer 30 extends from the display area AA to the bending area PB and covers the display panel 10 of the bending area PB. Optionally, the optical improvement layer 30 includes an optical film layer 31 and an adhesive layer 32, in the display area AA, the optical film layer 31 is attached to the color film layer 20 through the adhesive layer 32, and the protective layer 40 is located on a side of the optical film layer 31 away from the adhesive layer 32. In the bending area PB, the optical film layer 31 is directly attached to the display panel 10 of the bending area PB through the adhesive layer 32, so that the optical improvement layer 30 is directly attached to the display panel 10 of the bending area PB.

The material of the optical film layer 31 includes at least one of thermoplastic Polyurethane elastomers (TPU), Polyurethane (PU), polyethylene terephthalate (PET), and the like. The Adhesive layer 32 includes a Pressure Sensitive Adhesive (PSA) formed of an acrylate or a silicone. The adhesive layer 32 has good adhesion, for example, when the substrate is glass, the adhesion of the adhesive layer 32 is above 3N/inch. It is understood that when the optical improvement layer 30 extends from the display area AA to the bending area PB, the optical improvement layer 30 has a step difference between the bending area PB and the display panel due to the limited coverage area of the color film layer 20, but the step difference is small due to the thinness of the color film layer 20 compared to the thickness of the optical improvement layer 30. Moreover, the adhesive layer 32 of the optical improvement layer 30 is made of an adhesive material with adhesive force, and the adhesive material has good deformation performance, so that the adhesive layer 32 can well fill the segment difference.

By attaching the optical improvement layer 30 to the display panel 10 in the bending region PB, when the display panel 10 is bent, the optical improvement layer 30 can relieve the bending stress of the display panel 10 in the bending region PB, and avoid the occurrence of crack (crack) in the circuit of the bending region PB. So optics improves layer 30 can replace the UV of current OLED display panel bending zone to glue, just optics improves layer 30 and sets up for whole face, protective layer 40 etc. all sets up optics improves layer 30's relative top makes optics improve layer 30 with do not have between the protective layer 40 isotructure and interfere to there is UV glue and the problem of apron interference in the bending zone of current OLED display panel has been solved.

In an embodiment, the elastic modulus of the optical film 31 is greater than the elastic modulus of the adhesive layer 32, for example, the elastic modulus of the optical film 31 at normal temperature is not greater than 1Gpa, and the elastic modulus of the adhesive layer 32 at normal temperature is not greater than 1Mpa but not less than 10kpa, so as to adjust the neutral layer of each film of the bending region PB, so that the optical improvement layer 30 can better relieve the bending stress of the bending region PB and avoid the line fracture of the bending region PB.

In an embodiment, the thickness D1 of the optical film layer 31 is greater than the thickness D2 of the bonding layer 32, for example, the thickness D1 of the optical film layer 31 ranges from 20 micrometers to 90 micrometers, and the thickness D2 of the bonding layer 32 ranges from 5 micrometers to 25 micrometers, so as to further adjust the neutral layer of each film layer of the bending region PB, so that the optical improvement layer 30 can better relieve the bending stress of the bending region PB, and avoid the line breaking of the bending region PB.

Moreover, the optical improvement layer 30 has a uniform film thickness, and compared with the UV glue with different thicknesses in the conventional bending area, the arc shape formed by the bending area PB of the display panel 10 is smoother, thereby avoiding the large stress in the deformation area and the high risk of line fracture caused by the deformation of the formed arc. In order to better relieve the bending stress of the bending area PB, the optical improvement layer 30 further extends from the bending area PB to the bending extension area NB, and the length of the optical improvement layer 30 in the extending direction in the bending extension area NB is greater than or equal to 1 mm. It can be understood that, when the display panel 10 is bent, the bending stress applied to the bending start end and the bending end of the bending area PB is relatively large, and the optical improvement layer 30 is attached to the display panel 10 of the bending area PB and properly extends toward the bending extension area NB, so that the bending stress applied to the bending end of the bending area PB can be better released. Meanwhile, the optical improvement layer 30 covers the bending extension area NB, so that static electricity cannot directly contact with the circuit of the bending extension area NB, and the antistatic performance of the bending extension area NB is improved.

It is understood that, since the optical improvement layer 30 is disposed on the whole surface of the display area AA, in order to reduce the whole thickness of the display module 100, the thickness of the optical improvement layer 30 should not be large, and optionally, the thickness of the optical improvement layer 30 is less than or equal to 100 micrometers.

In addition, in order to avoid the optical improvement layer 30 from affecting the light transmittance of the display module 100, the optical improvement layer 30 should have a high light transmittance, for example, the overall light transmittance of the optical improvement layer 30 can be controlled to be between 70% and 99%, wherein the optical film layer 31 in the optical improvement layer 30 is made of a transparent material such as a thermoplastic polyurethane elastomer, so that the overall light transmittance of the optical improvement layer 30 is achieved by adjusting the light transmittance of the adhesive layer 32, for example, the light transmittance of the adhesive layer 32 can be between 70% and 99%. And the color separation phenomenon of the display module 100 can be improved by adjusting the transmittance of the optical improvement layer 30, because the color separation phenomenon is related to the intensity of light, and the color separation phenomenon is more serious when the intensity of light is higher, the color separation phenomenon can be alleviated by adjusting the transmittance of the optical improvement layer 30 to adjust the intensity of light.

In one embodiment, the color separation phenomenon can be further improved by adjusting the overall haze of the optically modifying layer 30, and the haze of the optically modifying layer 30 can be further improved by adjusting the haze of the bonding layer 32, such as the haze of the bonding layer 32 is in a range of 0.5% to 15%.

The protective layer 40 is disposed on a side of the optical improvement layer 30 away from the color film layer 20, and the protective layer 40 is attached to the optical improvement layer 30 through an optical adhesive 50. The optical adhesive 50 is used for bonding optical elements, and the optical adhesive 50 can be an OCA optical adhesive 50 which is colorless and transparent, has a light transmittance of more than 90%, has good bonding strength, can be cured at room temperature or at intermediate temperature, and has small curing shrinkage. The protective layer 40 is used to protect the display panel 10 from being damaged by external impact. Alternatively, the protective layer 40 includes cover glass or the like.

Optionally, in an embodiment, the display module 100 further includes a touch layer disposed between the optical improvement layer 30 and the protection layer 40, and the touch layer is used for implementing functions such as touch.

Certainly, the display module 100 further includes a back plate 60 and an auxiliary supporting layer 70 located on the non-light-emitting side of the display panel 10. The back plate 60 is used for supporting the display panel 10, and the auxiliary support layer 70 is used for further performing structural reinforcement on the display panel 10 and has functions of heat dissipation, buffering, light shielding and the like.

Specifically, the back plate 60 is attached to the non-light-emitting side of the display panel 10, and includes a first portion of back plate 61 and a second portion of back plate 62 which are oppositely disposed, the first portion of back plate 61 is disposed corresponding to the display area AA and extends to the bending area PB, and a portion of the first portion of back plate 61 extending to the bending area PB corresponds to a bending start end of the bending area PB; the second portion of the back plate 62 is disposed corresponding to the bending extension area NB and extends to the bending area PB, and a portion of the second portion of the back plate 62 extending to the bending area PB corresponds to a bending end of the bending area PB, so that a space is formed between the first portion of the back plate 61 and the second portion of the back plate 62. After the bending extension NB is bent to the non-light-emitting side of the display panel 10, the first partial back plate 61 and the second partial back plate 62 are opposite to each other, and the ends of the first partial back plate 61 and the second partial back plate 62 facing the bending area PB are flush.

Alternatively, the material of the back sheet 60 includes polyethylene terephthalate (PET) or the like. Because the PET material has the advantages of low elastic modulus and low thermal expansion tendency, the first part back panel 61 and the second part back panel 62 made of the PET material are not deformed due to the change of the environmental temperature, so that the possibility that the first part back panel 61 and the film layer connected with the first part back panel 61 are peeled off and the possibility that the second part back panel 62 and the film layer connected with the second part back panel are peeled off are reduced, and the yield and the reliability of the display module 100 are improved.

Optionally, the auxiliary support layer 70 includes a first support layer 71 and a second support layer 72, which are stacked, the second support layer 72 is located on a side of the first support layer 71 away from the first portion of the back plate 61, and the second support layer 72 is attached to the second portion of the back plate 62 by a double-sided tape 73, so that the bending extension region NB is fixed on the non-light-emitting side of the display panel 10 after the display panel 10 is bent.

Optionally, the first supporting layer 71 is glued to the net and the like and has the adhesive material of adhesive effect attached to the first part of the back plate 61, the net glue has the advantages of being easy to attach, capable of exhausting and the like, the net glue is used for attaching, and the undesirable phenomena of air bubbles, bulges and the like can be avoided during attaching. The first supporting layer 71 includes Foam materials such as Foam (Foam), which has moderate mechanical strength, can be bent, and has bending performance weaker than that of the display panel 10, so that the Foam is designed to exceed the first portion back plate 61 and extend toward the bending area PB, which can strengthen the supporting force of the bending start end of the bending area PB of the display panel 10 and avoid local stress concentration. Meanwhile, the foam has a good heat insulation effect, and the influence of heat generated during the working of the printed circuit board 80 and the binding wires on the display area AA can be avoided.

Alternatively, the second support layer 72 includes stainless steel, copper foil composite film, or the like. The copper foil composite film may be formed by laminating a Polyimide (PI) with glue, a glue material, and a copper foil, and the PI in the copper foil composite film is mainly used to increase the overall rigidity of the auxiliary support layer 70, so as to increase the pressure resistance of the back of the display panel 10. The copper foil has excellent electric conductivity, can be better realize the electromagnetic shielding effect, and the copper foil still has better heat conductivility simultaneously, can realize thermal quick transfer, with the heat transfer of local high temperature region to other places, the evenly distributed and the heat dissipation of heat of being convenient for.

Certainly, the structure of the auxiliary support layer 70 in the present application is not limited thereto, and the auxiliary support layer 70 may further include more or less film layers, for example, the auxiliary support layer 70 may further include a graphite layer, and the graphite may uniformly distribute heat, avoid local heat concentration, and further improve the heat dissipation effect of the display module 100.

Based on the same inventive concept, an embodiment of the present application further provides a display device, please refer to fig. 5, and fig. 5 is a schematic cross-sectional structure diagram of the display device provided in the embodiment of the present application. The display device 1000 includes a housing 200 and the display module 100 of one of the foregoing embodiments, the housing 200 is formed with a receiving cavity 201, and the display module 100 is assembled in the receiving cavity 201. The display apparatus 1000 may be a wearable device, such as a smart bracelet, a smart watch, or a Virtual Reality (VR) device, and may also be a mobile phone, an electronic book, an electronic newspaper, a television, or a personal portable computer, and may also be a flexible and foldable OLED display or lighting device, and the embodiment of the present application is not limited in particular to a specific form of the display apparatus.

According to the above embodiments:

the application provides a display module assembly and display device, this display module assembly include display panel and range upon range of the various rete, the optics of setting on display panel in proper order and improve layer and protective layer. The display panel comprises a display area and a bending area adjacent to the display area, the color film layer at least corresponds to the display area, the optical improvement layer is arranged on one side, away from the display panel, of the color film layer, and the protective layer is arranged on one side, away from the color film layer, of the optical improvement layer. The optical improvement layer extends from the display area to the bending area and covers the display panel of the bending area. The optical improvement layer arranged on the whole layer replaces UV glue in the bending area of the existing OLED display panel, interference cannot occur between the optical improvement layer arranged on the whole layer and the protective layer, and the problem that the UV glue and the cover plate interfere in the bending area of the existing OLED display panel is solved. And the whole layer of optical improvement layer that sets up covers on the color film layer, through adjusting the optical characteristic of optical improvement layer can improve the color separation problem of display module assembly.

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

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

Claims

1. A display module, comprising:

2. The display module assembly of claim 1, wherein the optical improvement layer comprises an optical film layer and an adhesive layer, the optical film layer is attached to the color film layer through the adhesive layer in the display area, and the protective layer is located on a side of the optical film layer away from the adhesive layer.

3. The display module of claim 2, wherein the optical film layer has a thickness greater than a thickness of the adhesive layer.

4. The display module of claim 2, wherein the optical film layer has a modulus of elasticity greater than the modulus of elasticity of the adhesive layer.

5. The display module according to claim 2, wherein the bonding layer has a transmittance ranging from 70% to 99%.

6. The display module according to claim 2, wherein the bonding layer has a haze ranging from 0.5% to 15%.

7. The display module of claim 2, wherein the optical modifying layer has a thickness of less than or equal to 100 microns.

8. The display module of claim 2, wherein the material of the optical film layer comprises at least one of a thermoplastic polyurethane elastomer, polyurethane, and polyethylene terephthalate.

9. The display module according to any one of claims 1 to 8, wherein the display panel further comprises a bending extension region located on a side of the bending region away from the display region, the optical improvement layer further extends from the bending region to the bending extension region, and a length of the optical improvement layer in an extension direction in the bending extension region is greater than or equal to 1 mm.

10. A display device, comprising a housing formed with a housing cavity and a display module set according to any one of claims 1 to 9, the display module set being fitted in the housing cavity.