CN114843417A - Display modules and display devices - Google Patents

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 modules and display devices

technical field

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

Background technique

For organic light-emitting diode (Organic Light-Emitting Diode, OLED) display panels, the polarizer can effectively reduce the reflectivity of the OLED display panel under strong light, but it causes the OLED display panel to lose nearly 58% of the light output, which greatly increases the It reduces the service life burden of OLED display panels. In order to improve the light emitting rate of the OLED display panel, the OLED display panel is usually produced by a polarizer-free (POL-less) technology, and the POL-less technology refers to a technology in which a color filter (CF) is used to replace the polarizer. Among them, the color filter consists of red color resistance, green color resistance, blue color resistance and black matrix (Black Matrix, BM). In the OLED display panel, the red color resistance, the green color resistance and the blue color resistance are responsible for the light output of the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit respectively, and the black matrix is mainly responsible for preventing the light leakage of the OLED display panel and reducing the The role of reflectivity of OLED display panels. The color filter can not only reduce the reflectivity of the OLED display panel under strong light to a certain extent, but also increase the light extraction rate of the OLED display panel from 42% to 60%. In addition, the thickness of the color film is much smaller than that of the polarizer and has high flexibility, which can reduce the overall thickness of the OLED display panel and is conducive to the development of dynamic bending products.

Further, in order to realize the narrow frame design of the OLED display panel, the bending area of the OLED display panel is usually bent to the back of the OLED display panel, thereby reducing the width of the frame. However, the bending of the bending area of the OLED display panel can easily lead to the breakage of the lines in the OLED display panel. In order to prevent the breakage of the lines caused by bending, UV glue is usually covered on the bending area of the OLED display panel to alleviate the damage of the OLED display panel. Bending stress in the bending zone. However, when the cover plate and the color filter are bonded by the optical glue, since the thickness of the color filter and the optical glue are both thin, interference between the cover plate and the UV glue will occur. And limited by the process technology, it is difficult to make the thickness of UV glue thinner.

SUMMARY OF THE INVENTION

The present application provides a display module and a display device to alleviate the technical problem of interference between the UV glue and the cover plate in the bending area of the existing OLED display panel.

In order to solve the above-mentioned problems, the technical solutions provided by this application are as follows:

The embodiment of the present application provides a display module, which includes:

a display panel, including a display area and a bending area adjacent to the display area;

a color filter layer, disposed on the display panel and at least corresponding to the display area;

an optical improvement layer, disposed on the side of the color filter layer away from the display panel; and

a protective layer, disposed on the side of the optical improvement layer away from the color filter layer;

Wherein, the optical improvement layer extends from the display area to the bending area, and covers the display panel in the bending area.

In the display module provided in the embodiment of the present application, the optical improvement layer includes an optical film layer and an adhesive layer, and in the display area, the optical film layer is attached to the color filter through the adhesive layer layer, the protective layer is located on the side of the optical film layer away from the adhesive layer.

In the display module provided by the embodiment of the present application, the thickness of the optical film layer is greater than the thickness of the adhesive layer.

In the display module provided by the embodiment of the present application, the elastic modulus of the optical film layer is greater than the elastic modulus of the adhesive layer.

In the display module provided by the embodiment of the present application, the transmittance of the adhesive layer ranges from 70% to 99%.

In the display module provided by the embodiment of the present application, the haze of the adhesive layer ranges from 0.5% to 15%.

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

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

In the display module provided by the embodiment of the present application, the display panel further includes a bending extension area located on a side of the bending area away from the display area, and the optical improvement layer further extends from the bending area to the bending extension area, and in the bending extension area, the length of the optical improvement layer in the extension direction is greater than or equal to 1 mm.

An embodiment of the present application further provides a display device, which includes a housing and a display module according to one of the foregoing embodiments, the housing is formed with an accommodating cavity, and the display module is assembled in the accommodating cavity.

The beneficial effects of the present application are: in the display module and the display device provided by the present application, the entire layer of the optical improvement layer is arranged to replace the UV glue in the bending area of the existing OLED display panel, and the entire layer of the optical improvement layer and protection There is no interference between the layers, which solves the problem of interference between the UV glue and the cover plate in the bending area of the existing OLED display panel. Moreover, the optical improvement layer disposed in the whole layer is covered on the color filter layer, which can improve the color separation problem of the display module.

Description of drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic cross-sectional structure diagram of a display module provided by an embodiment of the present application before being bent.

FIG. 2 is a schematic top-view structure diagram of the display panel provided by the embodiment of the present application before being bent.

FIG. 3 is a schematic cross-sectional structure diagram of the display module provided by the embodiment of the present application after being bent.

FIG. 4 is a schematic diagram of a detailed structure of an optical improvement layer provided in an embodiment of the present application.

FIG. 5 is a schematic cross-sectional structure diagram of a display device provided by an embodiment of the present application.

Detailed ways

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present application may be practiced. Directional terms mentioned in this application, such as [upper], [lower], [front], [rear], [left], [right], [inner], [outer], [side], etc., are only for reference Additional schema orientation. Therefore, the directional terms used are used to describe and understand the present application, rather than to limit the present application. In the figures, structurally similar elements are denoted by the same reference numerals. In the drawings, the thicknesses 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 shown, but the present application is not limited thereto.

Please refer to FIGS. 1 to 4 , FIG. 1 is a schematic cross-sectional structure diagram of a display module provided by an embodiment of the present application before bending, and FIG. 2 is a top-view structural schematic diagram of a display panel provided by an embodiment of the present application before being bent 3 is a schematic diagram of a cross-sectional structure of the display module provided by the embodiment of the application after bending, and FIG. 4 is a schematic diagram of the detailed structure of the optical improvement layer provided by the embodiment of the application. The display module 100 includes a display panel 10 and a color filter layer 20 , an optical improvement layer 30 and a protective 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 the part of the display panel 10 used for displaying images; the bending area PB is designed with fan-out wirings for connecting with the signal wirings in the display area AA Connection; the bending extension area NB refers to the part of the display panel 10 used for designing the binding wiring, and is used for connecting with the printed circuit board 80 .

The display panel 10 includes a flexible display panel 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 refers to the side opposite to the light-emitting side of the display panel 10 , and the light-emitting side of the display panel 10 refers to the side of the display panel 10 displaying the picture, the color filter The layer 20 is disposed on the light-emitting side of the display panel 10 .

The color filter layer 20 is disposed on the light-emitting side of the display panel 10 and is disposed at least corresponding to the display area AA, that is, a part of the color filter layer 20 can also extend from the display area AA to the bending District PB. The color filter layer 20 is used to replace the polarizer, and plays the role of 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 used to emit red light, the green The sub-pixel unit is used for emitting green light, and the blue sub-pixel unit is used for emitting blue light. The color filter layer 20 includes a plurality of color resists and a black matrix (Black Matrix, BM) disposed between different color resists. The multiple color resists include red color resists, green color resists, and blue color resists. Color resistance, wherein the red color resistance is arranged corresponding to the red sub-pixel unit, and the red color resistance is responsible for the light output of the red sub-pixel unit; the green color resistance is arranged corresponding to the green sub-pixel unit, and the The green color resistance is responsible for the light output of the green sub-pixel unit; the blue color resistance is disposed corresponding to the blue sub-pixel unit, and the blue color resistance is responsible for the light output of the blue sub-pixel unit; the black color resistance The matrix is mainly responsible for preventing light leakage of the display module 100 and reducing the reflectivity of the display module 100 .

The optical improvement layer 30 is disposed on the side of the color filter 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 The display panel 10 in 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 filter layer 20 through the adhesive layer 32. Above, the protective layer 40 is located on the 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 in the bending area PB through the adhesive layer 32, so that the optical improvement layer 30 is directly attached on the display panel 10 in the bending area PB.

The material of the optical film layer 31 includes thermoplastic polyurethane elastomers (thermoplastic urethanes, TPU), polyurethane (polyurethane, PU) for short, polyethylene terephthalate (Poly ethylene terephthalate, PET), etc. at least one of them. The adhesive layer 32 includes a pressure sensitive adhesive (Pressure Sensitive Adhesive, PSA) formed of acrylate or silicone. The adhesive layer 32 has good adhesive force, for example, when the substrate is glass, the adhesive force of the adhesive layer 32 is above 3N/inch. It can be understood that when the optical improvement layer 30 extends from the display area AA to the bending area PB, due to the limited coverage area of the color filter layer 20, the optical improvement layer 30 is in the bending area. There is a step difference between the folding area PB and the display panel. However, since the thickness of the color filter layer 20 is thinner than that of the optical improvement layer 30 , the step difference is small. In addition, the adhesive layer 32 of the optical improvement layer 30 is an adhesive material, and the adhesive material has good deformation properties, so that the adhesive layer 32 can well fill the gap.

By attaching the optical improvement layer 30 on the display panel 10 in the bending area PB, when the display panel 10 is bent, the optical improvement layer 30 can alleviate the The bending stress of the bending area PB prevents the lines of the bending area PB from being cracked. In this way, the optical improvement layer 30 can replace the UV glue in the bending area of the existing OLED display panel, and the optical improvement layer 30 is arranged on the entire surface, and the protective layer 40 and the like are arranged on the opposite side of the optical improvement layer 30 . Above, there is no interference between the optical improvement layer 30 and the protective layer 40 and other structures, thereby solving the problem of interference between the UV glue and the cover plate in the bending area of the existing OLED display panel.

In an embodiment, the elastic modulus of the optical film layer 31 is greater than the elastic modulus of the adhesive layer 32 , for example, the elastic modulus of the optical film layer 31 at room temperature does not exceed 1 Gpa, and the The elastic modulus of the adhesive layer 32 at room temperature is not more than 1Mpa, but not less than 10kpa, so as to adjust the neutral layer of each film layer of PB in the bending area, so that the optical improvement layer 30 can better alleviate the The bending stress of the bending area PB prevents the lines of the bending area PB from breaking.

In an embodiment, the thickness D1 of the optical film layer 31 is greater than the thickness D2 of the adhesive layer 32, for example, the thickness D1 of the optical film layer 31 ranges from 20 microns to 90 microns, and the adhesive layer The thickness D2 of 32 ranges from 5 microns to 25 microns, so as to further adjust the neutral layer of each film layer of the bending area PB, so that the optical improvement layer 30 can better ease the bending of the bending area PB. stress to avoid breakage of the lines in the bending region PB.

Moreover, the film thickness of the optical improvement layer 30 is uniform. Compared with the existing UV glue with different thicknesses in the bending area, the circular arc formed in the bending area PB of the display panel 10 can be more compact. It is smooth and avoids the formation of arc deformation, which leads to high stress in the deformation area and high risk of line breakage. 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 in the bending extension area NB , the length of the optical improvement layer 30 along the extending direction is greater than or equal to 1 mm. It can be understood that when the display panel 10 is bent, the bending stress at 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 bending stress. On the display panel 10 of the bending area PB, and appropriately extending to the bending extension area NB, the bending stress on the bending end of the bending area PB can be better relieved. At the same time, since the optical improvement layer 30 covers the bending extension area NB, static electricity cannot directly contact the lines of the bending extension area NB, and the antistatic performance of the bending extension area NB is improved.

It can be understood that, since the optical improvement layer 30 is also disposed in the display area AA, in order to reduce the overall thickness of the display module 100, the thickness of the optical improvement layer 30 should not be large, and optional Preferably, the thickness of the optical improvement layer 30 is less than or equal to 100 microns.

In addition, in order to prevent 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, such as the overall light transmittance of the optical improvement layer 30 . The rate range can be controlled between 70% and 99%, wherein the optical film layer 31 in the optical improvement layer 30 is made of transparent materials such as thermoplastic polyurethane elastomer, so the overall transmittance of the optical improvement layer 30 is adjusted by adjusting The transmittance of the adhesive layer 32 can be achieved, for example, the light transmittance of the adhesive layer 32 can be in the range of 70% to 99%. Moreover, the color separation phenomenon of the display module 100 can also be improved by adjusting the transmittance of the optical improvement layer 30, because the color separation phenomenon is related to the intensity of light. Therefore, by adjusting the transmittance of the optical improvement layer 30 to adjust the light intensity, the color separation phenomenon can be alleviated.

In one embodiment, the color separation phenomenon can be further improved by adjusting the overall haze of the optical improvement layer 30 , and the haze of the optical improvement layer 30 can also be adjusted by adjusting the haze of the adhesive layer 32 . For example, the haze of the adhesive layer 32 ranges from 0.5% to 15%.

The protective layer 40 is disposed on the side of the optical improvement layer 30 away from the color filter layer 20 , and the protective layer 40 is attached to the optical improvement layer 30 through the optical glue 50 . The optical adhesive 50 is used for bonding optical components, and the optical adhesive 50 can be an OCA optical adhesive with the characteristics of colorless and transparent, light transmittance above 90%, good bonding strength, curing at room temperature or medium temperature, and small curing shrinkage. 50. The protective layer 40 is used to protect the display panel 10 from being damaged by external impact force. Optionally, the protective layer 40 includes cover glass or the like.

Optionally, in an embodiment, the display module 100 further includes a touch control layer disposed between the optical improvement layer 30 and the protective layer 40 , and the touch control layer is used to realize touch control and other functions.

Of course, the display module 100 also includes structures such as a backplane 60 and an auxiliary support layer 70 located on the non-light-emitting side of the display panel 10 . The back plate 60 is used to support the display panel 10 , and the auxiliary support layer 70 is used to further strengthen the structure of the display panel 10 , and has functions such as heat dissipation, buffering, and shading.

Specifically, the backplane 60 is attached to the non-light-emitting side of the display panel 10 , and includes a first part of the backplane 61 and a second part of the backplane 62 that are opposite to each other, and the first part of the backplane 61 corresponds to the display area AA is set and extends to the bending area PB, the part of the first part of the back plate 61 extending to the bending area PB corresponds to the bending start end of the bending area PB; the second part of the back plate 61 62 is disposed corresponding to the bending extension area NB and extends to the bending area PB, and the part of the second part of the back plate 62 extending to the bending area PB corresponds to the bending end of the bending area PB , so that there is a gap between the first part of the back plate 61 and the second part of the back plate 62 . After the bending extension area NB is bent to the non-light-emitting side of the display panel 10 , the first part of the back plate 61 and the second part of the back plate 62 are opposite, and the first part of the back plate 61 and all the The second part of the back plate 62 is flush with the end of the bending area PB.

Optionally, the material of the back plate 60 includes polyethylene terephthalate (Poly ethyleneterephthalate, PET) or the like. Because the PET material has the advantages of low elastic modulus and is not easy to expand when heated, the first part of the back plate 61 and the second part of the back plate 62 made of PET material will not be deformed due to changes in ambient temperature, reducing the first part of the back plate. The possibility of peeling off the film layer connected with the board 61 and the possibility of peeling off the film layer connected with the second part of the back plate 62, thereby improving the yield and reliability of the display module 100 .

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

Optionally, the first support layer 71 can be attached to the first part of the back plate 61 through a glue material such as grid glue, which has the advantages of being easy to fit and can be exhausted. The mesh glue is used for bonding, which can avoid the occurrence of air bubbles, bulging and other undesirable phenomena during bonding. The first support layer 71 includes foam materials such as foam. The foam has moderate mechanical strength and can be bent, and the bending performance is weaker than that of the display panel 10. Therefore, the foam is designed to exceed the first part. The back plate 61 extends toward the bending area PB, which can strengthen the support force for the bending starting end of the bending area PB of the display panel 10 and avoid local stress concentration. At the same time, the foam has a good heat insulation effect, which can prevent the printed circuit board 80 and the heat generated during the work of binding the wiring from affecting the display area AA.

Optionally, the second support layer 72 includes stainless steel, copper foil, copper foil composite film and the like. The copper foil composite film can be formed by laminating polyimide with glue (Polyimide, PI), glue and copper foil, and the PI in the copper foil composite film is mainly used to increase the auxiliary support layer 70. The overall rigidity can increase the pressure resistance of the back of the display panel 10 . Copper foil has excellent electrical conductivity, which can better achieve electromagnetic shielding. At the same time, copper foil also has good thermal conductivity, which can achieve rapid heat transfer, transfer heat from local high temperature areas to other places, and facilitate the uniformity of heat. distribution and heat dissipation.

Of course, the structure of the auxiliary support layer 70 in the present application is not limited to this, and the auxiliary support layer 70 may also include more or less film layers, for example, the auxiliary support layer 70 may also include a graphite layer, etc. The heat can be uniformly distributed, local heat concentration can be avoided, and the heat dissipation effect of the display module 100 can be further improved.

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

According to the above embodiment, it can be known that:

The present application provides a display module and a display device. The display module includes a display panel and a color filter layer, an optical improvement layer and a protective layer that are sequentially stacked on the display panel. The display panel includes a display area and a bending area adjacent to the display area, the color filter layer is disposed at least corresponding to the display area, and the optical improvement layer is disposed on the color filter layer away from the display On one side of the panel, the protective layer is disposed on the side of the optical improvement layer away from the color filter layer. The optical improvement layer extends from the display area to the bending area and covers the display panel in the bending area. By setting the whole layer of optical improvement layer to replace the UV glue in the bending area of the existing OLED display panel, there will be no interference between the optical improvement layer and the protective layer, which solves the bending area of the existing OLED display panel. There is a problem of interference between the UV glue and the cover plate. Moreover, the optical improvement layer disposed in the whole layer is covered on the color filter layer, and the color separation problem of the display module can be improved by adjusting the optical properties of the optical improvement layer.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

The embodiments of the present application have been introduced in detail above, and specific examples are used herein to illustrate the principles and implementations of the present application. The descriptions of the above embodiments are only used to help understand the technical solutions and core ideas of the present application; It should be understood by those of ordinary skill in the art that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the application. The scope of the technical solutions of each embodiment.

Claims (10)

1. A display module, comprising:

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.

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.

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