Display module, preparation method thereof and display device

Abstract

The invention provides a display module, a preparation method thereof and a display device. The display module comprises a display panel, a backlight module and a bonding layer. The display panel comprises a display area and a frame area arranged around the display area. The backlight module comprises a light guide plate and an optical film layer, the light guide plate is provided with a first face and a second face which are oppositely arranged, the first face is closer to the display panel than the second face, the first face comprises a first area and a second area arranged around the first area, and the second area is arranged around the first area. The optical film layer is arranged between the display panel and the first face, and the orthographic projection of the optical film layer on the first face is located in the first area. The bonding layer is arranged between the display panel and the first face, the orthographic projection of the bonding layer on the display panel is located in the frame area, and the orthographic projection of the bonding layer on the first face is located in the second area.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module and a preparation method thereof, and a display device. Background Art

[0002] As the display component of electronic devices, display modules have been widely used in various electronic products. The ultra-thin and narrow-frame design of display modules are increasingly favored by terminal manufacturers and consumers.

[0003] In the related art, the display module includes a backlight module and a display panel. The backlight module includes a back plate, a light guide plate, a plastic frame and other structures. The plastic frame is arranged on the inner side of the back plate, and the display panel is arranged on the inner side of the plastic frame and supported on the plastic frame, so as to achieve the fixation between the back plate, the plastic frame and the display panel. However, it is difficult to achieve ultra-thinness and narrow frame for the display module arranged in this way. Summary of the invention

[0004] A first aspect of an embodiment of the present disclosure provides a display module, including:

[0005] The display panel comprises a display area and a frame area arranged around the display area;

[0006] A backlight module, comprising a light guide plate and an optical film layer, wherein the light guide plate has a first surface and a second surface arranged opposite to each other, the first surface is closer to the display panel than the second surface, the first surface comprises a first area and a second area arranged around the first area, the optical film layer is arranged between the display panel and the first surface, and an orthographic projection of the optical film layer on the first surface is located in the first area;

[0007] An adhesive layer is disposed between the display panel and the first surface, wherein the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area.

[0008] Optionally, the display panel includes a first polarizer, an array substrate, a liquid crystal layer, a color film substrate, and a second polarizer which are stacked in sequence, and the first polarizer is close to the optical film layer;

[0009] The adhesive layer is disposed between the array substrate and the first surface, and an orthographic projection of the adhesive layer on the array substrate and an orthographic projection of the first polarizer on the array substrate do not overlap each other; and / or

[0010] An air gap is provided between the first polarizer and the optical film layer. In a direction perpendicular to the display panel, a thickness of the adhesive layer is equal to a sum of thicknesses of the first polarizer, the air gap and the optical film layer.

[0011] Optionally, the orthographic projection of the adhesive layer on the display panel is a first annular orthographic projection, the first annular orthographic projection surrounds the display area, and the first annular orthographic projection and the display area do not overlap each other.

[0012] Optionally, the optical density of the adhesive layer is greater than or equal to 2; and / or

[0013] In the first direction, the thickness of the adhesive layer ranges from 0.05 mm to 0.5 mm, and the first direction is perpendicular to the display panel. In the second direction, the width of the adhesive layer ranges from 0.3 mm to 2 mm, and the second direction is perpendicular to the first direction.

[0014] Optionally, the orthographic projection of the light guide plate on the display panel is located within the display panel, and the orthographic projection of the light guide plate on the display panel covers the display area.

[0015] Optionally, the light guide plate comprises a rigid light guide plate, and the rigid light guide plate comprises a glass light guide plate.

[0016] Optionally, the light guide plate further includes: a side surface adjacent to the first surface and the second surface;

[0017] The backlight module further includes: a first light shielding layer covering the second area and the side surface.

[0018] Optionally, the first light shielding layer includes:

[0019] A first shading portion covers the second area, wherein the orthographic projection of the first shading portion on the display panel is located in the frame area and has a gap with the display area, and the gap is greater than or equal to 0.5 mm.

[0020] Optionally, the first light shielding layer includes:

[0021] A first shading portion covers the second area, wherein the orthographic projection of the first shading portion on the first surface is a second annular orthographic projection, and an inner edge of the second annular orthographic projection overlaps with an edge of the orthographic projection of the optical film layer on the first surface.

[0022] Optionally, the first light shielding layer includes:

[0023] A first light shielding portion, covering the second area;

[0024] a second light shielding portion, covering the side surface, wherein the second light shielding portion and the first light shielding portion are connected at a position where the side surface is adjacent to the first surface;

[0025] In a direction perpendicular to the first surface, the thickness of the first shading portion ranges from 0.006 mm to 0.03 mm, and in a direction perpendicular to the side surface, the thickness of the second shading portion ranges from 0.006 mm to 0.03 mm.

[0026] Optionally, the backlight module further includes: a second light shielding layer covering the second surface of the light guide plate; and / or

[0027] The backlight module also includes:

[0028] A reflective sheet, arranged on one side of the second surface of the light guide plate;

[0029] The bonding portion is arranged between the reflection sheet and the second surface.

[0030] Optionally, the side surface has a first circumferential angle at a position adjacent to the first surface, and the side surface has a second circumferential angle at a position adjacent to the second surface, and the first circumferential angle and the second circumferential angle respectively include: a rounded corner and / or a chamfer.

[0031] Optionally, in a direction perpendicular to the display panel, a width of the border area ranges from 1.0 mm to 1.4 mm; and / or

[0032] In a direction perpendicular to the display panel, the thickness of the display module ranges from 0.9 mm to 3.0 mm.

[0033] A second aspect of the disclosed embodiment provides a method for preparing a display module, comprising:

[0034] Providing a display panel, comprising a display area and a frame area surrounding the display area;

[0035] A backlight module is provided, comprising a light guide plate and an optical film layer, wherein the light guide plate has a first surface and a second surface arranged opposite to each other, the first surface is closer to the display panel than the second surface, the first surface comprises a first area and a second area arranged around the first area, the optical film layer is arranged on one side of the first surface of the light guide plate, and the orthographic projection of the optical film layer on the first surface is located in the first area;

[0036] An adhesive layer is formed between the display panel and the first surface of the light guide plate, the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area.

[0037] A third aspect of the embodiments of the present disclosure provides a display device, comprising a display module as described in any one of the first aspects.

[0038] The technical solution provided in the embodiments of the present disclosure has at least the following technical effects or advantages:

[0039] The display module provided by the embodiment of the present disclosure includes a display panel, a backlight module and an adhesive layer. The display panel includes a display area and a frame area arranged around the display area. The backlight module includes a light guide plate and an optical film layer, the light guide plate has a first surface and a second surface arranged relatively to each other, the first surface is closer to the display panel than the second surface, the first surface includes a first area and a second area arranged around the first area, the optical film layer is arranged between the display panel and the first surface, and the orthographic projection of the optical film layer on the first surface is located in the first area. The adhesive layer is arranged between the display panel and the first surface, the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area. Therefore, the embodiment of the present disclosure utilizes the adhesive layer to realize the integration of the display panel and the backlight module, removes the middle frame structure (or glue frame structure) in the traditional display module, thereby realizing the lightness and thinness of the display module and the narrow frame.

[0040] The above description is only an overview of the technical solution provided by the embodiment of the present disclosure. In order to more clearly understand the technical means of the embodiment of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present disclosure more obvious and easy to understand, the specific implementation method of the embodiment of the present disclosure is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present disclosure. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0042] Figure 1 A partial cross-sectional structural schematic diagram of a display module in the related art is shown;

[0043] Figure 2 A partial cross-sectional structural schematic diagram of another display module in the related art is shown;

[0044] Figure 3 A partial cross-sectional structural schematic diagram of a display module according to an embodiment of the present disclosure is shown;

[0045] Figure 4 A schematic diagram of a planar structure of a display panel according to an embodiment of the present disclosure is shown;

[0046] Figure 5 A partial cross-sectional structural schematic diagram of a light guide plate according to an embodiment of the present disclosure is shown;

[0047] Figure 6A partial three-dimensional structural schematic diagram of a backlight module of the related art is shown;

[0048] Figure 7 Another partial three-dimensional structural schematic diagram of a backlight module of the related art is shown;

[0049] Figure 8 A partial cross-sectional structural schematic diagram of a backlight module according to an embodiment of the present disclosure is shown;

[0050] Fig. 9 A schematic diagram of a planar structure of a light guide plate according to an embodiment of the present disclosure is shown;

[0051] Fig.10 Another partial cross-sectional structural schematic diagram of the backlight module of the embodiment of the present disclosure is shown;

[0052] Fig.11 Another partial cross-sectional structural schematic diagram of the backlight module of the embodiment of the present disclosure is shown;

[0053] Fig.12 A partial cross-sectional structural schematic diagram of a display panel according to an embodiment of the present disclosure is shown;

[0054] Fig.13 A partial cross-sectional structural schematic diagram of a light guide plate according to an embodiment of the present disclosure is shown;

[0055] Fig.14 Another partial cross-sectional structural schematic diagram of the light guide plate of the embodiment of the present disclosure is shown;

[0056] Fig.15 A flow chart showing a method for preparing a display module according to an embodiment of the present disclosure is shown;

[0057] Fig.16 A detailed flow chart of step S20 of an embodiment of the present disclosure is shown;

[0058] Fig.17 A structural block diagram of a display device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0059] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the term "plurality" appearing herein includes two or more than two situations.

[0060] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0061] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, the difference between the two equalities is less than or equal to 5% of either one.

[0062] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0063] As a display component of electronic devices, display modules have been widely used in various electronic products, and ultra-thin and narrow-frame designs are increasingly favored by terminal manufacturers and consumers. For example, the display module can be any electronic product or component with display function, such as a display screen, a mobile phone, a laptop, a tablet computer, a wearable display module (such as a smart watch, smart glasses, etc.), a television, a digital photo frame, etc.

[0064] For example, LCD (Liquid Crystal Display) display module is one of the most common display modules currently, with a wide range of applications, including but not limited to handheld LCD products, car-mounted LCD products, large-size LCD products (such as TV (Television) products), etc.

[0065] See also Figure 1 , shows a schematic diagram of a partial cross-sectional structure of a display module in the related art.

[0066] like Figure 1As shown, illustratively, the display module 100 generally includes a display panel 104 and a backlight module. The backlight module mainly includes: a middle frame 101, a light source, a back plate, a light guide plate 102 and an optical film layer 103 (such as a diffuser and a reflector, etc.). The middle frame 101 of the backlight module is arranged on one side of the display panel 104, and the middle frame 101 is provided with a bearing platform that can bear the display panel 104, and a receiving area that can bear the light guide plate 102, the diffuser plate and the reflector, etc. The bearing platform needs to be connected and fixed with the frame area of ​​the display panel 104 by an adhesive, and the middle frame 101 is located on the outside of the bottom plate around the back plate, and the surface of the middle frame 101 is polished by a lens. The main function of the middle frame 101 is to reflect the light emitted by the light source and support the light guide plate 102, the diffuser plate and the reflector, etc. The back plate of the backlight module can support the middle frame 101. However, the display module 100 configured in this way is difficult to achieve ultra-thinness and narrow frame of the display module 100 due to the limitation of the middle frame 101 .

[0067] See also Figure 2 , shows a schematic diagram of a partial cross-sectional structure of another display module in the related art.

[0068] like Figure 2 As shown, exemplarily, the display module 1' includes a backlight module 10' and a display panel 20', the backlight module 10' includes a back plate 11' and a plastic frame 12', the plastic frame 12' is arranged on the inner side of the back plate 11', the display panel 20' is arranged on the inner side of the plastic frame 12' and supported on the plastic frame 12', and the shading tape 30' is wrapped around the back plate 11', the plastic frame 12' and the display panel 20', so as to achieve fixation between the back plate 11', the plastic frame 12' and the display panel 20'. Due to the limitation of the frame, it is difficult to achieve ultra-thinness and narrow frame of the display module 1' with such a configuration.

[0069] The inventors of the disclosed embodiments noticed that by changing the module design of the display module, directly bonding and fixing the light guide plate to the display module, and removing the middle frame (or plastic frame), the display module can be made ultra-thin and have a narrow border. At the same time, the middle frame and the plastic frame can be prevented from blocking the light emitted by the backlight source of the backlight module, thereby avoiding problems such as dark frames and edge pixels being blocked.

[0070] See also Figure 3 , showing a schematic diagram of a partial cross-sectional structure of a display module of an embodiment of the present disclosure.

[0071] The display module 10 of the disclosed embodiment may be a liquid crystal display module 10 , an organic light emitting diode (OLED) display module 10 , or an electrophoretic display module 10 . In the following embodiments, the display module 10 is described as a liquid crystal display module 10 .

[0072] like Figure 3As shown, the display module 10 of the embodiment of the present disclosure includes: a display panel 1, a backlight module 2 and an adhesive layer 3. The display panel 1 includes a display area 11 and a frame area 12 arranged around the display area 11. The backlight module 2 includes a light guide plate 21 and an optical film layer 22, the light guide plate 21 has a first surface 21A and a second surface 21B arranged opposite to each other, the first surface 21A is closer to the display panel 1 than the second surface 21B, the first surface 21A includes a first area 21C and a second area 21D arranged around the first area 21C, the optical film layer 22 is arranged between the display panel 1 and the first surface 21A, and the orthographic projection of the optical film layer 22 on the first surface 21A is located in the first area 21C. The adhesive layer 3 is arranged between the display panel 1 and the first surface 21A, the orthographic projection of the adhesive layer 3 on the display panel 1 is located in the frame area 12, and the orthographic projection of the adhesive layer 3 on the first surface 21A is located in the second area 21D.

[0073] Therefore, the embodiment of the present disclosure directly bonds and fixes the display panel 1 and the backlight module 2 through the adhesive layer 3, thereby realizing the integration of the display panel 1 and the backlight module 2, and removing the middle frame (or plastic frame) in the traditional display module 10, thereby realizing the ultra-thinness and narrow frame of the display module 10, and making the display module 10 lighter; at the same time, it can reduce the preparation cost of the display module 10; in addition, it can avoid the middle frame and the plastic frame from blocking the light emitted by the backlight source of the backlight module 2, so as to avoid problems such as dark frames and edge pixels being blocked.

[0074] Exemplarily, the display panel 1 (Cell) is the display structure of the display module 10, including an array substrate 14, a liquid crystal layer, and a color film substrate 15, etc., which will not be elaborated in this embodiment. According to different display principles, the display panel 1 can be an organic light emitting diode (OLED) display panel 1, a quantum dot light emitting diode (QLED) display panel 1, a micro-light emitting diode (Mini-LED or Micro-LED) display panel 1, etc., and can also be a liquid crystal display (LCD) panel. The following is an example of a liquid crystal display panel 1.

[0075] Among them, the backlight module 2 is used to provide a backlight source with uniform brightness distribution for the display panel 1. The backlight module 2 is provided with a backlight source around the light guide plate 21 or in the light guide plate 21. When the light emitted by the backlight source enters the light guide plate 21, the light guide plate 21 can process the light, for example, change the propagation direction of the light, so that the light is emitted from the light emitting surface of the light guide plate 21, and provide backlight for the display panel 1. Exemplarily, the type of the backlight source can be LED (Light Emitting Diode), Mini-LED, QLED (Quantum Dot Light Emitting Diodes, quantum dot light emitting diodes), etc. If not specifically stated, LED is used as an example for description in this embodiment.

[0076] It should be noted that the first surface 21A of the light guide plate 21 refers to the surface facing the display panel 1. The light emitted by the backlight source of the backlight module 2 is emitted from the first surface 21A of the light guide plate 21, and then is processed by the optical film layer 22 (such as diffusion and uniform light, etc.) and then incident on the display panel 1.

[0077] Among them, the first surface 21A includes a first area 21C and a second area 21D arranged around the first area 21C. It can be understood that the first area 21C can refer to the light-emitting area, that is, the light emitted from the first surface 21A of the light guide plate 21 is emitted from the first area 21C; thus, the second area 21D can refer to the non-light-emitting area, that is, the light emitted from the first surface 21A of the light guide plate 21 will not be emitted from the second area 21D. For example, a shading layer is provided in the second area 21D to block the light corresponding to the second area 21D.

[0078] In some embodiments, the orthographic projection area of ​​the light guide plate 21 on the display panel 1 is substantially consistent with the area of ​​the display panel 1. In other words, the size of the light guide plate 21 is substantially consistent with the size of the display panel 1. Therefore, when the display module 10 is used, when the user views the display module 10, since the size of the light guide plate 21 is substantially consistent with that of the display panel 1, the user can only view the existence of the display panel 1, thereby achieving the full screen and narrow frame effect of the display module 10.

[0079] In some embodiments, the orthographic projection of the light guide plate 21 on the display panel 1 is located inside the display panel 1 , and the orthographic projection of the light guide plate 21 on the display panel 1 covers the display area 11 .

[0080] It can be understood that since the middle frame (or plastic frame) is removed, the area of ​​the display panel 1 is not limited by the middle frame (or plastic frame) provided by the traditional back panel during design. For example, the area of ​​the display panel 1 can be designed to be larger than the light guide plate 21. Therefore, when the user views the display module 10, since the backlight module 2 is located on the side of the display panel 1 facing away from the user, the user can only see the existence of the display panel 1, thereby achieving the full screen and narrow frame effect of the display module 10.

[0081] Exemplarily, the orthographic projection of the first area 21C on the display panel 1 covers the display area 11, and the orthographic projection of the second area 21D on the display panel 1 is located in the frame area 12. For example, the orthographic projection area of ​​the first area 21C on the display panel 1 is larger than the display area 11, that is, the first area 21C can completely cover the display area 11 of the display panel 1 with reserved space, and there is a gap between the orthographic projection of the second area 21D on the display panel 1 and the display area 11. Therefore, when the display panel 1 displays a picture, it will not be affected by the second area 21D and will not cause problems such as dark shadows and blurred edges.

[0082] Based on the above introduction to the display panel 1 and the light guide plate 21 , the optical film layer 22 disposed between the display panel 1 and the light guide plate 21 will be introduced below.

[0083] The optical film layer 22 is disposed between the display panel 1 and the first surface 21A of the light guide plate 21, and the orthographic projection of the optical film layer 22 on the first surface 21A is located in the first region 21C. For example, the orthographic projection of the optical film layer 22 on the first surface 21A is substantially consistent with the first region 21C. Thus, the light of the backlight source can be completely received by the optical film layer 22 after being emitted from the first region 21C, and the light enters the display panel 1 after being processed (for example, diffusion and homogenization) by the optical film layer 22.

[0084] In some embodiments, the optical film layer 22 includes a combination of a diffuser and a prism, wherein the diffuser may be one or more, the prism may be one or more, and thus the optical film layer 22 may be one or more. Thus, the light emitted from the first surface 21A of the light guide plate 21 is processed by the optical film layer 22 and then incident on the display panel 1.

[0085] Based on the above introduction to the display panel 1 , the light guide plate 21 and the optical film layer 22 , the adhesive layer 3 disposed between the display panel 1 and the first surface 21A of the light guide plate 21 will be introduced below.

[0086] It is understandable that the display panel 1 and the first surface 21A of the light guide plate 21 are directly bonded and fixed by the adhesive layer 3, and the middle frame (or plastic frame) in the traditional display module 10 is removed, so that the display module 10 can be ultra-thin and have a narrow frame.

[0087] The orthographic projection of the adhesive layer 3 on the display panel 1 is located in the frame area 12, for example, the orthographic projection of the adhesive layer 3 on the display panel 1 is substantially consistent with the frame area 12, or the outer edge of the orthographic projection of the adhesive layer 3 on the display panel 1 is at a certain distance from the edge of the frame area 12, for example, the distance is 0.1 mm, 0.15 mm, 0.2 mm, etc., 0.25 mm, 0.3 mm, etc.; or the inner edge of the orthographic projection of the adhesive layer 3 on the display panel 1 is at a certain distance from the edge of the display area 11, for example, the distance is 0.1 mm, 0.15 mm, 0.2 mm, etc., 0.25 mm, 0.3 mm, etc. Thus, the adhesive layer 3 can achieve the bonding and fixing of the display panel 1 and the light guide plate 21 without affecting the display effect of the display area 11, so as to ensure the display yield of the display area 11.

[0088] Continue to see Figure 3 In some embodiments, the display panel 1 includes a first polarizer 13, an array substrate 14, a liquid crystal layer (not shown), a color film substrate 15, and a second polarizer 16 which are stacked in sequence, and the first polarizer 13 is close to the optical film layer 22;

[0089] The adhesive layer 3 is disposed between the array substrate 14 and the first surface 21A, and the orthographic projection of the adhesive layer 3 on the array substrate 14 and the orthographic projection of the first polarizer 13 on the array substrate 14 do not overlap each other.

[0090] It should be noted that, since both the first polarizer 13 and the optical film layer 22 are optical films, the optical films may have problems such as wrinkles when squeezed, thereby affecting the display effect. Therefore, if the adhesive layer 3 is directly bonded to the first polarizer 13 and / or the optical film layer 22, the first polarizer 13 and the optical film layer 22 may be deformed or wrinkled. The array substrate 14 is usually made of a substrate with a certain strength, such as a glass substrate. On this basis, the embodiment of the present disclosure sets an adhesive layer 3 between the array substrate 14 and the first surface 21A, so as not to affect the optical performance of the optical film, while enabling the adhesive layer 3 to play a certain supporting role for the display panel 1 and the backlight module 2.

[0091] In some embodiments, the display panel 1 includes a first polarizer 13, an array substrate 14, a liquid crystal layer, a color film substrate 15, and a second polarizer 16 which are stacked in sequence, the first polarizer 13 is close to the optical film layer 22, and there is an air gap 4 between the first polarizer 13 and the optical film layer 22; in a direction perpendicular to the display panel 1, the thickness of the adhesive layer 3 is equal to the sum of the thicknesses of the first polarizer 13, the air gap 4, and the optical film layer 22.

[0092] It is understandable that under certain conditions (such as high temperature or humid heat conditions), the optical film layer 22 may expand due to heat or other reasons, resulting in an increase in the thickness of the optical film layer 22 in a direction perpendicular to the display panel 1. Therefore, in order to avoid poor picture quality problems such as wrinkles caused by squeezing of the optical film layer 22 during expansion, the embodiment of the present disclosure reserves an air gap 4 between the first polarizer 13 and the optical film layer 22 when the display panel 1 and the light guide plate 21 are bonded using the adhesive layer 3. That is, the thickness of the adhesive layer 3 is equal to the sum of the thicknesses of the first polarizer 13, the air gap 4 and the optical film layer 22, thereby reserving expansion space for the optical film layer 22 to avoid problems such as wrinkles.

[0093] Continue to see Figure 3 In some embodiments, in the first direction X, the thickness of the adhesive layer 3 ranges from 0.05 mm to 0.5 mm, and the first direction is perpendicular to the display panel 1. For example, the thickness of the adhesive layer 3 can be 0.05 mm, 0.07 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.24 mm, 0.28 mm, 0.3 mm, 0.36 mm, 0.41 mm, 0.48 mm, 0.5 mm, etc. Specifically, it can be determined according to one or more of the thickness of the first polarizer 13, the thickness of the optical film layer 22, and the thickness of the air gap 4, which is not limited here.

[0094] In some embodiments, in the second direction Y, the width of the adhesive layer 3 is in the range of 0.3 mm to 2 mm. The second direction is perpendicular to the first direction. It can be understood that the second direction can be the direction from the display area 11 to the border area 12, or the direction from the border area 12 to the display area 11.

[0095] It is understandable that, in addition to achieving the bonding and fixing between the display panel 1 and the backlight module 2, the adhesive layer 3 also needs to have a certain supporting function, so as to avoid the mutual extrusion between the first polarizer 13 and the optical film layer 22, resulting in wrinkles in the optical film layer 22. Therefore, on the basis that the adhesive layer 3 has a certain thickness, in order to improve the supporting strength of the adhesive layer 3, it can be achieved by increasing the width of the adhesive layer 3 in the second direction, wherein the thickness of the adhesive layer 3 in the second direction can be: 0.3 mm, 0.35 mm, 0.40 mm, 0.45 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, etc. It is understandable that the width of the adhesive layer 3 in the second direction may not exceed the outer edge of the frame area 12 of the display panel 1.

[0096] See also Figure 4, shows a schematic diagram of a planar structure of a display panel 1 according to an embodiment of the present disclosure. It can be understood that, Figure 4 It is a plan view of the side of the display panel 1 close to the backlight module 2 .

[0097] In some embodiments, the orthographic projection of the adhesive layer 3 on the display panel 1 is a first annular orthographic projection 31 , the first annular orthographic projection 31 surrounds the display area 11 , and the first annular orthographic projection 31 and the display area 11 do not overlap each other.

[0098] It is understandable that, as the demand for narrow borders of the display module 10 increases, the border area 12 of the display module 10 may be set to be narrower, for example, set to be less than or equal to 1.5 mm, etc. Then, in order to improve the structural stability of the display module 10 and the light guide plate 21 after bonding, the positive projection of the adhesive layer 3 on the first surface 21A may be annular, that is, the adhesive layer 3 is arranged around the display area 11, so as to make use of the gap between the display panel 1 and the light guide plate 21 in the border area 12 as much as possible, so as to improve the structural stability of the display module 10.

[0099] Exemplarily, the adhesive layer 3 may include an adhesive. It should be noted that the term "adhesive" should be understood in a broad sense, and any liquid or solid having adhesive properties that can achieve the attachment of the light guide plate 21 to the display panel 1 can be used as the adhesive according to the embodiment of the present disclosure. The specific type of adhesive is not particularly limited. For example, the adhesive may include at least one of glue, photoresist, optical glue, semi-solid glue, foam glue or PET (Polyethylene Glycol Terephthalate) glue. The above-mentioned adhesives are widely available and easy to obtain, thereby saving production costs and facilitating the promotion and large-scale utilization of the light guide plate 21.

[0100] It is understandable that, based on the above, the adhesive layer 3 not only realizes the bonding and fixing between the display panel 1 and the backlight module 2, but also needs to have a certain supporting function, so as to avoid the mutual extrusion between the first polarizer 13 and the optical film layer 22, resulting in wrinkles in the optical film layer 22. Therefore, in the process of preparing the adhesive layer 3, the supporting strength of the adhesive layer 3 can be improved by a moisture curing process or a UV (Ultraviolet curing) process.

[0101] In some embodiments, the adhesive layer 3 has a buffering property, and the adhesive layer 3 uses a buffering foam. Therefore, when the display module 10 is impacted by external force, the adhesive layer 3 can buffer the force between the display panel 1 and the light guide plate 21, release the stress, etc., to improve the reliability of the display module 10.

[0102] Exemplarily, the adhesive layer 3 has dustproof and waterproof properties, thereby further improving the reliability of the display module 10 .

[0103] Exemplarily, since the adhesive layer 3 corresponds to the second area 21D of the light guide plate 21 and the frame area 12 of the display panel 1, the second area 21D is a non-light emitting area, and the frame area 12 is a non-display area 11. Therefore, the adhesive layer 3 can have a light-shielding property, and the optical density (OD value, Optical Density, or absorbance, transmittance) of the adhesive layer 3 can be greater than or equal to 2, for example, the optical density is 2, 2.5, 2.8, 3, 3.2, 3.4, 4.5, 5, 6, etc. Among them, the optical density represents the common logarithmic value of the ratio of the intensity of light incident on the adhesive layer 3 to the intensity of transmitted light, such as the logarithmic value of log10. It can be understood that the greater the optical density, the better the light-shielding property of the adhesive layer 3.

[0104] It is understandable that in the process of preparing the adhesive layer 3, the positioning technology of the CCD (Charge Coupled Device) device can be used to set a mark on the display panel 1 (array substrate 14) in advance, obtain the mark through the CCD device, and apply glue or other materials at the mark position to achieve setting the adhesive layer 3 on one side of the display panel 1 (array substrate 14); similarly, a mark is set on the light guide plate 21 in advance, obtain the mark through the CCD device, and apply glue or other materials at the mark position to achieve setting the adhesive layer 3 on one side of the light guide plate 21. In this way, the display panel 1 and the light guide plate 21 are bonded and fixed.

[0105] It is understandable that, based on the above, the embodiment of the present disclosure can achieve ultra-thinness and narrow frame of the display module 10 by directly bonding and fixing the display panel 1 and the light guide plate 21, and removing the middle frame (or glue frame) in the traditional display module 10. In the traditional display module 10, the backlight module 2 usually needs to be provided with a back plate to provide support for the light guide plate 21 and the optical film layer 22, etc., so as to ensure the strength of the backlight module 2. However, the setting of the back plate will undoubtedly increase the thickness of the display module 10, which is inconsistent with the design of the ultra-thin display module 10 of the embodiment of the present disclosure. In view of this, the embodiment of the present disclosure further achieves ultra-thinness of the display module 10 by setting the light guide plate 21 as a rigid light guide plate 21, and the light guide plate 21 itself has sufficient strength to provide support for the backlight source and the optical film layer 22 set on the light guide plate 21, replacing the back plate of the traditional display module 10. The light guide plate 21 is further introduced below.

[0106] In some embodiments, the light guide plate 21 includes a rigid light guide plate 21, and the material of the rigid light guide plate 21 can be glass, PMMA (Poly Methyl Meth Acrylate), FR4 (Flame Retardant Type 4), BT (Triazine and Bismaleimide), ceramics, etc. Taking the glass light guide plate 21 as an example, the expansion coefficient of the glass material is small, and the ultra-thin design of the display module 10 will not be greatly deformed, thereby improving the reliability of the display module 10.

[0107] Exemplarily, in the preparation process of the glass light guide plate 21, the first surface 21A and the second surface 21B of the glass light guide plate 21 are treated by a chemical strengthening process to improve the strength of the glass light guide plate 21. It can be understood that chemical strengthening means: improving the strength of the glass light guide plate 21 by changing the composition of the surface of the glass light guide plate 21, using other alkali metal ions to exchange with Na+ or K+ ions on the surface of the glass, thereby forming an ion exchange layer on the surface of the glass substrate, and when the glass light guide plate 21 is cooled to room temperature, the glass light guide plate 21 is in a state where the inner layer is under tension and the outer layer is under compression, thereby achieving the purpose of increasing strength.

[0108] For example, when the glass light guide plate 21 is subjected to a reliability test, the test parameter requirements may be: a 4PB (4 point bend) value greater than 350, and no breakage occurs under a pressure of 450 MPa or 550 MPa.

[0109] See also Figure 5 , shows a schematic diagram of the partial cross-sectional structure of the light guide plate 21 of the embodiment of the present disclosure.

[0110] In some embodiments, the first surface 21A and / or the second surface 21B of the light guide plate 21 is coated with a coating 23 , and the material of the coating 23 includes an organic material, such as an organic polymer material, and may also include an inorganic material, an additive, and the like.

[0111] In a specific implementation, the organic material may be coated on the first surface 21A and / or the second surface 21B of the light guide plate 21 by one or more coating processes such as spraying, flow coating, sputtering, slit coating, spin coating, and blade coating to form the coating layer 23 .

[0112] In the embodiment of the present disclosure, since the coating 23 is coated on the surface of the light guide plate 21 instead of being attached to the surface of the light guide plate 21 by bonding, the coating 23 in the embodiment of the present disclosure has higher adhesion to the surface of the light guide plate 21 and stronger tear resistance, which can further improve the reliability of the light guide plate 21.

[0113] In a specific implementation, the light guide plate 21 may be coated on one side, for example, the coating 23 is coated on the first side 21A, or the coating 23 is coated on the second side 21B. Alternatively, the light guide plate 21 may be coated on both sides, for example, the coating 23 is coated on the first side 21A and the second side 21B.

[0114] Therefore, by coating the coating 23 on the first surface 21A and / or the second surface 21B of the light guide plate 21, when the light guide plate 21 is impacted or squeezed by external force, the coating 23 can absorb and transform part of the external force through its own elasticity or plastic deformation, thereby protecting the light guide plate 21 and improving the ability of the light guide plate 21 to resist squeezing, impact and falling.

[0115] It is understandable that when the backlight source of the backlight module 2 is different, the light guide plate 21 may adopt different structures, for example, the backlight module 2 includes an edge-entry backlight source and a direct-type backlight source. For ease of understanding, the backlight module 2 including an edge-entry backlight source and the backlight module 2 including a direct-type backlight source in the related art are introduced below.

[0116] See also Figure 6 , showing a partial three-dimensional structural schematic diagram of a backlight module of the related art.

[0117] like Figure 6As shown, the backlight module with the side-entry light guide plate 01 includes: a backlight source (not shown in the figure), a light guide plate 01, an optical film layer 02 and a back plate 03. Among them, the backlight source is arranged on the side of the light guide plate 01 and is used to emit light to the light guide plate 01, so as to use the light guide plate 01 to guide the side-incident light to be emitted from the light exit surface of the light guide plate 01. The optical film layer 02 includes a diffuser and a prism sheet, etc. The optical film layer 02 includes one or more, and multiple optical film layers 02 are stacked on the light exit surface of the light guide plate 01, and are used to perform processing such as diffusion and uniform light on the light exiting from the light exit surface. The light guide plate 01 is arranged on a side surface of the back plate 03 close to the light emitting surface, and a plurality of optical film layers 02 are sequentially stacked on a side surface of the light guide plate 01 close to the light emitting surface, and the backlight source is fixed on the side surface of the light guide plate 01, that is, the back plate 03 is arranged on a side of the internal components of the backlight module away from the light emitting surface, so that the back plate 03 can be used to support the entire backlight module and encapsulate the back side. Exemplarily, the back plate 03 has a U-shaped bend 032 at the edge, and the U-shaped bend 032 includes two parts that are respectively perpendicular to the surface of the back plate body 031 and parallel to the surface of the back plate body 031, which can enclose a groove 0321 at the edge of the back plate 03 to accommodate the backlight source and the edge of the light guide plate 01, so as to fix the backlight source and avoid light leakage at the position of the backlight source, and the U-shaped bend 032 can also be used as a reinforcing rib to strengthen the edge of the backlight module, thereby supporting the edge of the display device. However, using the back plate 03 to support the entire backlight module and to encapsulate the back side will undoubtedly increase the thickness of the backlight module. In addition, using the U-shaped bend to accommodate the edge of the backlight source and the light guide plate 01 will undoubtedly increase the frame width of the backlight module.

[0118] See also Figure 7 , shows another partial three-dimensional structural schematic diagram of a backlight module of the related art.

[0119] like Figure 7As shown, the backlight module with a direct-type light guide plate includes: a backlight source, a light guide plate, an optical film layer 002 and a back plate 003. Among them, the backlight source is arranged on the light guide plate as the original light source; for example, the light guide plate has a plurality of light zones arranged in an array, each light zone includes at least one Mini-Led, and each light zone can be independently controlled, so that the pixels in the corresponding area of ​​the light zone can obtain accurate backlight brightness. The light guide plate and the plurality of optical film layers 002 are sequentially stacked on the surface of the back plate 003, and the edge of the back plate 003 has only a narrow bending structure 0032 perpendicular to the surface of the back plate body 0031. Furthermore, compared with the back plate 003 with a U-shaped bending structure 0032 in the related art, the edge of the back plate 003 in the backlight module has lower strength. Therefore, a rubber frame 004 is also required to support the edge of the backlight module, so as to protect the plurality of optical film layers 002 and the light plate 001 and avoid light leakage. However, as narrow frame and thin thickness gradually become the common technical requirements of display modules, the existence of the plastic frame 004 increases the width and thickness of the frame of the display module.

[0120] Through the above introduction to the backlight module 2 in the related art, it can be found that the traditional backlight module 2 supports the light guide plate 21 by setting a back plate and a rubber frame, while the embodiment of the present disclosure has removed the back plate and the rubber frame by directly bonding and fixing the light guide plate 21 to the display panel 1, and improving the strength of the light guide plate 21, so as to achieve ultra-thinness and narrow frame of the display module 10. When the light guide plate 21 is prepared by a transparent substrate, in addition to considering the support strength of the light guide plate 21, it is also necessary to consider the shading and light transmission of the light guide plate 21, so as to avoid the problems such as poor display (such as excessive brightness in the edge area, etc.) or poor light utilization caused by light leakage from the backlight module 2. Therefore, the following mainly describes how the backlight module 2 using a transparent light guide plate 21 solves the shading problem and improves the light utilization.

[0121] See also Figure 8 , shows a schematic diagram of a partial cross-sectional structure of the backlight module 2 of an embodiment of the present disclosure.

[0122] It can be understood that the thickness of the first light shielding layer 24 and the second light shielding layer 25 are substantially smaller. Figure 8 For the convenience of explanation, the thicknesses of the first light shielding layer 24 and the second light shielding layer 25 are explicitly indicated.

[0123] In some embodiments, the light guide plate 21 further includes: a side surface 21E adjacent to the first surface 21A and the second surface 21B; the backlight module 2 further includes: a first light shielding layer 24 covering the second area 21D and the side surface 21E.

[0124] It can be understood that since the second area 21D is a non-light-emitting area, by covering the second area 21D with the first shading layer 24, the light corresponding to the second area 21D can be blocked to avoid the light from being emitted to the second area 21D and causing light leakage. In addition, in order to avoid the light from being emitted from the side 21E of the light guide plate 21 and causing light leakage, the first shading layer 24 is also covered on the side 21E to further reduce the light leakage problem and improve the display effect of the display module 10.

[0125] Exemplarily, the first shading layer 24 can be made of black material, which has a light-absorbing effect, so that the first shading layer 24 can absorb light leaking from the second area 21D and the side 21E of the first surface 21A of the light guide plate 21, thereby reducing the problem of light leakage of the display panel 1.

[0126] Exemplarily, the first light shielding layer 24 is made of black ink, and the black ink is printed on the second area 21D of the first surface 21A of the light guide plate 21 and the side 21E of the light guide plate 21. The black coating 23 formed by the black ink can absorb the light leaked from the side 21E of the light guide plate 21 and the light leaked from the second area 21D.

[0127] Among them, the black ink can be made of materials such as anthraquinone, azo, metal coordination compounds, perylene compounds, etc., such as ink materials, such as black ink materials. The preparation process of the black ink material can adopt inkjet printing, pad printing and other processes.

[0128] For example, in the preparation process of the first light shielding layer 24, the light guide plate 21 and the optical film layer 22 can be assembled and placed on a stage, and the edge of the light guide plate 21 can be suspended to prevent the ink from interfering with the stage during printing and affecting the printing effect of the ink. In specific implementation, a pressure head is used to absorb the ink, and the ink is transferred to the second area 21D and the side 21E of the first surface 21A of the light guide plate 21 through the deformation of the pressure head.

[0129] In some embodiments, the first light shielding layer 24 may also be made of light shielding tape, which may be a buffer foam, PET tape, or the like.

[0130] In some embodiments, the first light shielding layer 24 includes:

[0131] The first light shielding portion 24A covers the second area 21D. The orthographic projection of the first light shielding portion 24A on the display panel 1 is located in the frame area 12 and has a gap with the display area 11 .

[0132] It is understandable that, since the light entering the light guide plate 21 will enter the display area 11 of the display panel 1 for display after being emitted through the first area 21C, when the size of the light guide plate 21 is substantially the same as that of the display panel 1, the second area 21D may correspond to the frame area 12 in position. Then, the first light shielding portion 24A covers the second area 21D, and can shield the light corresponding to the second area 21D in the light guide plate 21, so that the light emitted from the light guide plate 21 will not enter the frame area 12 of the display panel 1, thereby avoiding the problem of light leakage at the edge of the display area 11 of the display panel 1.

[0133] In addition, in order to prevent the problem of dark shadows or blurred edges appearing in the display screen after the light enters the display panel 1, such as the appearance of black shadows at the edge of the display screen, the embodiment of the present disclosure sets the first light shielding portion 24A and the display area 11 to have a certain gap, thereby, the first light shielding portion 24A will not appear in the display screen, and the interference between the light emitted by the light guide plate 21 and the first light shielding portion 24A can be reduced, thereby avoiding the appearance of dark shadows in the display screen and affecting the display effect. Exemplarily, the gap between the orthographic projection of the first light shielding portion 24A on the display panel 1 and the display area 11 is greater than or equal to 0.5 mm, for example, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.70 mm, 0.75 mm, 0.80 mm, etc.

[0134] See also Fig. 9 , shows a schematic diagram of a planar structure of the light guide plate 21 of the embodiment of the present disclosure. It can be understood that, Fig. 9 This is a plan view of the first surface 21A of the light guide plate 21 .

[0135] In some embodiments, the first light shielding layer 24 includes:

[0136] The first shading portion 24A covers the second area 21D, and the orthographic projection of the first shading portion 24A on the first surface 21A is a second annular orthographic projection 24A1, and the inner edge of the second annular orthographic projection 24A1 overlaps with the edge of the orthographic projection of the optical film layer 22 on the first surface 21A.

[0137] It can be understood that, since the frame area 12 is arranged around the display area 11, the orthographic projection of the first light shielding portion 24A on the display panel 1 is located in the frame area 12. If the orthographic projection of the first light shielding portion 24A on the first surface 21A is a second annular projection, the positions corresponding to the frame area 12 on the first surface 21A of the light guide plate 21 can be shielded to prevent light from leaking into the non-light emitting area and the non-display area 11. In addition, the inner edge of the second annular orthographic projection 24A1 overlaps with the edge of the orthographic projection of the optical film layer 22 on the first surface 21A, so that the light emitted from the first surface 21A of the light guide plate 21 completely enters the optical film layer 22, further reducing the problem of light leakage.

[0138] In some embodiments, the first light shielding layer 24 includes:

[0139] A first light shielding portion 24A, covering the second area 21D;

[0140] The second light shielding portion 24B covers the side surface 21E, and the second light shielding portion 24B and the first light shielding portion 24A are connected at a position where the side surface 21E is adjacent to the first surface 21A.

[0141] It is understandable that the position where the side surface 21E is adjacent to the first surface 21A may refer to the position where the side surface 21E intersects with the first surface 21A. Exemplarily, the light guide plate 21 has four side surfaces 21E, and each side surface 21E intersects with the first surface 21A.

[0142] Since the first light-shielding portion 24A covers the second area 21D and the second light-shielding portion 24B covers the side surface 21E, if the second light-shielding portion 24B is connected to the first light-shielding portion 24A at a position where the side surface 21E is adjacent to the first surface 21A, it means that the junction between the side surface 21E and the first surface 21A is also shielded, that is, the first light-shielding layer 24 can completely wrap the side surface 21E of the light guide plate 21 and the second area 21D of the first surface 21A, thereby further reducing the problem of light leakage.

[0143] In some embodiments, the first light shielding layer 24 includes a first light shielding portion 24A and a second light shielding portion 24B.

[0144] The first shading portion 24A covers the second area 21D. In the direction X perpendicular to the first surface 21A, the thickness of the first shading portion 24A ranges from 0.006 mm to 0.03 mm, for example, 0.006 mm, 0.008 mm, 0.01 mm, 0.015 mm, 0.018 mm, 0.02 mm, 0.023 mm, 0.028 mm, or 0.03 mm.

[0145] The second shading portion 24B covers the side surface 21E, and in the direction Y perpendicular to the side surface 21E, the thickness of the second shading portion 24B ranges from 0.006 mm to 0.03 mm, for example, 0.006 mm, 0.008 mm, 0.01 mm, 0.015 mm, 0.018 mm, 0.02 mm, 0.023 mm, 0.028 mm, or 0.03 mm.

[0146] It is understandable that the thickness and width of the shading portion are designed to achieve the shading effect while minimizing the thickness and width, thereby minimizing the frame thickness of the display module 10.

[0147] See also Fig.10 , shows another partial cross-sectional structural schematic diagram of the backlight module 2 of the embodiment of the present disclosure.

[0148] In some embodiments, the backlight module 2 further includes: a second light shielding layer 25 covering the second surface 21B of the light guide plate 21 .

[0149] It should be noted that for a direct-type backlight source, the backlight source is arranged on the light guide plate 21 as the original light source; for example, the light guide plate 21 has a plurality of light zones arranged in an array, each light zone includes at least one Mini-Led, and each light zone can be independently controlled, so that the pixels in the corresponding area of ​​the light zone can obtain accurate backlight brightness. When a transparent light guide plate 21 is used, in order to avoid light leakage from the second surface 21B of the light guide plate 21, a second light shielding layer 25 can also be covered on the second surface 21B of the backlight module 2, wherein the preparation of the second light shielding layer 25 can refer to the first light shielding layer 24, and will not be repeated here.

[0150] See also Fig.11 , shows another partial cross-sectional structural schematic diagram of the backlight module 2 of the embodiment of the present disclosure.

[0151] In some embodiments, the backlight module 2 further includes:

[0152] A reflective sheet 26, disposed on one side of the second surface 21B of the light guide plate 21;

[0153] The adhesive portion 27 is provided between the reflection sheet 26 and the second surface 21B.

[0154] It should be noted that, for a direct-lit backlight source, the backlight source is disposed on the light guide plate 21 as the original light source; for example, the light guide plate 21 has a plurality of light zones arranged in an array, and each light zone includes at least one Mini-Led. A reflective sheet 26 may be disposed on one side of the second surface 21B of the light guide plate 21, for example, the reflective sheet 26 is bonded to the second surface 21B, thereby the reflective sheet 26 can be used to reflect the light emitted by the plurality of Mini-Leds when transmitting them to the second surface 21B, thereby improving the utilization rate of the light.

[0155] It should be noted that, for the edge-entry backlight source, the backlight source is disposed on the side 21E of the light guide plate 21 and is used to emit light to the light guide plate 21, and the light guide plate 21 is used to guide the side-incident light to be emitted from the light exit surface of the light guide plate 21. Usually, for the edge-entry backlight source, a plurality of grid points are disposed on the second surface 21B, and a reflective sheet 26 is disposed on one side of the second surface 21B, so that the light emitted by the edge-entry backlight source can be reflected at the position corresponding to the grid points and the reflective sheet 26 after entering the light guide plate 21, and then emitted from the first surface 21A.

[0156] In some embodiments, the transmittance of the adhesive portion 27 may be greater than 90%, such as 90%, 92%, 94%, 96%, 99%, 100%, etc. For example, the adhesive portion 27 may be a high-transmittance adhesive with low haze, or may be an OCA (Optically Clear Adhesive) optical adhesive. The Young's modulus of the adhesive portion 27 is greater than 270 KPa, thereby reducing the internal stress generated between the adhesive portion 27 and the reflective sheet 26. In the direction perpendicular to the light guide plate 21, the thickness of the adhesive portion 27 is 50 um to 125 um. It can be understood that the thickness of the adhesive portion 27 is relatively thick, the cost is relatively high and the thickness of the display module 10 will be increased; the thickness of the adhesive portion 27 is relatively thin, and the adhesive ability is weak, which can be adjusted according to actual needs.

[0157] See also Fig.12 , shows a schematic diagram of a partial cross-sectional structure of the display panel 1 according to an embodiment of the present disclosure.

[0158] In some embodiments, the display panel 1 includes a first polarizer 13, an array substrate 14, a liquid crystal layer, a color film substrate 15, and a second polarizer 16 which are stacked in sequence, and the first polarizer 13 is close to the optical film layer 22;

[0159] The display panel 1 further includes: a third light shielding layer 17, the third light shielding layer 17 covers the side surface 21E of the array substrate 14 and a third area on a surface of the array substrate 14 close to the first polarizer 13, wherein the orthographic projection of the first polarizer 13 on the array substrate 14 is located in an area of ​​the array substrate 14 other than the third area;

[0160] The display panel 1 also includes: a fourth shading layer 18, the fourth shading layer 18 covers the side surface 21E of the color filter substrate 15 and a fourth area on a side of the color filter substrate 15 close to the second polarizer 16, wherein the orthographic projection of the second polarizer 16 on the color filter substrate 15 is located in an area of ​​the color filter substrate 15 other than the fourth area.

[0161] It is understandable that the array substrate 14 and the color filter substrate 15 can be prepared using a transparent substrate. Therefore, in some cases, the array substrate 14 and the color filter substrate 15 also have a light shielding requirement. On this basis, a third light shielding layer 17 is provided to shield the area of ​​the array substrate 14 that needs light shielding, and a fourth light shielding layer 18 is provided to shield the area of ​​the color filter substrate 15 that has light shielding, so as to further reduce the light leakage problem of the display module 10. The preparation of the third light shielding layer 17 and the fourth light shielding layer 18 can refer to the first light shielding layer 24, and will not be repeated here.

[0162] See also Fig.13 , which shows a partial cross-sectional structural schematic diagram of the light guide plate 21 of the embodiment of the present disclosure; see Fig.14 , shows another partial cross-sectional structural schematic diagram of the light guide plate 21 of the embodiment of the present disclosure.

[0163] In some embodiments, the side surface 21E has a first circumferential angle at a position adjacent to the first surface 21A, and the side surface 21E has a second circumferential angle at a position adjacent to the second surface 21B, and the first circumferential angle and the second circumferential angle respectively include: a fillet 26 and / or a chamfer 27.

[0164] Exemplarily, the first circumference may include a plurality of first circumferences, and the plurality of first circumferences may include a rounded corner 26 (eg, Fig.13 As shown), it may include a chamfer 27 (as shown Fig.14 As shown), it may also include a fillet 26 and a chamfer 27; similarly, the second circumferential angle may include multiple, and among the multiple second circumferential angles, it may include a fillet 26, may include a chamfer 27, or may include a fillet 26 and a chamfer 27.

[0165] It is understandable that in order to improve the strength of the light guide plate 21, the side 21E of the light guide plate 21 can be ground to remove the fragile cracks generated when the light guide plate 21 is cut. For example, the side 21E can be ground to form the first and second circumference angles mentioned above. Grinding the first and second circumference angles into fillets 26 or chamfers 27 can make it easier to apply the first and second light shielding layers 24 and 25 during preparation, for example, it is easier to apply ink.

[0166] In some embodiments, the radius of the fillet 26 ranges from 0.05 mm to 0.07 mm, for example, 0.05 mm, 0.055 mm, 0.06 mm, 0.064 mm, 0.068 mm, 0.07 mm, etc.

[0167] In some embodiments, in the direction Y perpendicular to the side surface 21E, the width of the orthographic projection of the chamfer 27 on the light guide plate 21 is in the range of 0.07 mm to 0.09 mm, for example, 0.07 mm, 0.075 mm, 0.08 mm, 0.086 mm, 0.09 mm, etc. In addition, the angle between the surface of the chamfer 27 and the direction perpendicular to the display panel 1 can be 30° to 60°, for example, 30°, 35°, 40°, 55°, 60°, etc.

[0168] It is understandable that the array substrate 14 and / or the color filter substrate 15 of the display panel 1 may also be configured with chamfers 27 or rounded corners 26 to facilitate coating of the third light shielding layer 17 and the fourth light shielding layer 18 .

[0169] In some embodiments, in a direction perpendicular to the display panel 1 , the width of the border area 12 ranges from 1.0 mm to 1.4 mm, for example, 1.0 mm, 1.05 mm, 1.1 mm, 1.05 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, etc.

[0170] It is understandable that, since the plastic frame and the middle frame are removed, the overall frame width of the display module 10 is smaller, thereby achieving a narrow frame of the display module 10 .

[0171] In some embodiments, in a direction perpendicular to the display panel 1, the thickness of the display module 10 ranges from 0.9 mm to 3.0 mm, for example, 0.9 mm, 1.0 mm, 1.05 mm, 1.06 mm, 1.08 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.5 mm, 3 mm, etc.

[0172] It is understandable that since the middle frame, border and back plate are removed, the thickness of the entire display module 10 is smaller. For example, for the LCD display module 10, the thickness can be smaller than that of the traditional LCD display module 10, thereby achieving ultra-thin LCD display module 10.

[0173] See also Fig.15 , showing a flow chart of a method for preparing a display module of an embodiment of the present disclosure.

[0174] A second aspect of the present disclosure provides a method for preparing a display module, including but not limited to:

[0175] Step S10. Providing a display panel, including a display area and a frame area surrounding the display area;

[0176] Exemplarily, the display panel includes a first polarizer, an array substrate, a liquid crystal layer, a color filter substrate, and a second polarizer stacked in sequence. The preparation of the display panel can refer to related technologies and will not be described in detail here.

[0177] Step S20. Provide a backlight module, including a light guide plate and an optical film layer, wherein the light guide plate has a first surface and a second surface that are arranged opposite to each other, the first surface is closer to the display panel than the second surface, the first surface includes a first area and a second area arranged around the first area, the optical film layer is arranged on one side of the first surface of the light guide plate, and the orthographic projection of the optical film layer on the first surface is located in the first area;

[0178] See also Fig.16 , shows a detailed flow chart of step S20 of an embodiment of the present disclosure.

[0179] In a specific implementation, one of the preparation methods of the backlight module may include:

[0180] Step S21. Providing a glass substrate, wherein the glass substrate has a first surface and a second surface that are oppositely disposed;

[0181] Step S22. Arrange a plurality of dots on the second surface of the glass substrate to chemically strengthen the first surface and the second surface of the glass substrate;

[0182] Exemplarily, in the process flow of preparing the glass light guide plate, the first surface and the second surface of the glass light guide plate are treated by a chemical strengthening process to improve the strength of the glass light guide plate. It is understandable that the chemical strengthening process includes: improving the strength of the glass light guide plate by changing the composition of the surface of the glass light guide plate, using other alkali metal ions to exchange with Na+ or K+ ions on the surface of the glass, thereby forming an ion exchange layer on the surface of the glass substrate, and when the glass light guide plate is cooled to room temperature, the glass light guide plate is in a state where the inner layer is under tension and the outer layer is under compression, thereby achieving the purpose of increasing strength.

[0183] Step S23. Disposing a backlight source on the side of the glass substrate;

[0184] Step S24. Grinding the side surface, the edge of the first surface and the edge of the second surface of the glass substrate with a cutter head so that a first angle formed by the side surface and the first surface is rounded or chamfered, and a second angle formed by the side surface and the second surface is rounded or chamfered;

[0185] Step S25. forming an optical film layer on the first surface of the glass substrate;

[0186] Step S26. Bonding a reflective sheet to the second surface of the glass substrate;

[0187] Step S27: forming a first light shielding layer on the side surface of the glass substrate and the second region of the first surface.

[0188] For example, in the preparation process of the first light shielding layer, the light guide plate and the optical film layer can be assembled and placed on a stage, and the edge of the light guide plate can be suspended in the air to prevent the ink from interfering with the stage during printing and affecting the printing effect of the ink. In specific implementation, a pressure head is used to absorb the ink, and the ink is transferred to the second area and the side of the first surface of the light guide plate through the deformation of the pressure head.

[0189] Thus, after steps S21 to S27, one of the backlight modules of the embodiments of the present disclosure is prepared.

[0190] Step S30. Form an adhesive layer between the display panel and the first surface of the light guide plate, wherein the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area.

[0191] For example, in the process of preparing the adhesive layer, the support strength of the adhesive layer can be improved by a moisture curing process or a UV (Ultraviolet curing) process.

[0192] Based on the above disclosed content, the display module prepared by the preparation method of the display module of the embodiment of the present disclosure includes a display panel, a backlight module and an adhesive layer. The display panel includes a display area and a frame area arranged around the display area. The backlight module includes a light guide plate and an optical film layer, the light guide plate has a first surface and a second surface arranged relatively, the first surface is closer to the display panel than the second surface, the first surface includes a first area and a second area arranged around the first area, the optical film layer is arranged between the display panel and the first surface, and the orthographic projection of the optical film layer on the first surface is located in the first area. The adhesive layer is arranged between the display panel and the first surface, the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area. Therefore, the embodiment of the present disclosure uses the adhesive layer to realize the integration of the display panel and the backlight module, removes the middle frame structure (or glue frame structure) in the traditional display module, thereby realizing the lightness and thinness of the display module and the narrow frame.

[0193] See also Fig.17 , showing a structural block diagram of a display device according to an embodiment of the present disclosure.

[0194] A third aspect of the embodiments of the present disclosure provides a display device 200, comprising a display module 10 as described in any one of the first aspects.

[0195] The display device 200 may be a product having an image (including a static image or a dynamic image, wherein the dynamic image may be a video) display function. The display device may be, for example: a virtual reality (VR) display device, an augmented reality (AR) display device, a display, a mobile phone (MobilePhone), a tablet computer (Pad), a laptop computer, a television, a personal digital assistant (PDA), an ultra-mobile personal computer (MMPC), a netbook, a wearable device (such as a smart watch) or a vehicle-mounted display device, etc. This embodiment does not limit the type of the display device.

[0196] Based on the above disclosed contents, the display device 200 of the embodiment of the present disclosure includes a display module 10, including a display panel, a backlight module and an adhesive layer. The display panel includes a display area and a frame area arranged around the display area. The backlight module includes a light guide plate and an optical film layer, the light guide plate has a first surface and a second surface arranged relatively, the first surface is closer to the display panel than the second surface, the first surface includes a first area and a second area arranged around the first area, the optical film layer is arranged between the display panel and the first surface, and the orthographic projection of the optical film layer on the first surface is located in the first area. The adhesive layer is arranged between the display panel and the first surface, the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area. Therefore, the embodiment of the present disclosure utilizes the adhesive layer to realize the integration of the display panel and the backlight module, removes the middle frame structure (or glue frame structure) in the traditional display module, thereby realizing the lightness and thinness and narrow frame of the display module.

[0197] In the above description, the technical details such as the composition of each layer of the product are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. Although each embodiment is described separately above, it does not mean that the measures in each embodiment cannot be used in combination to advantage.

[0198] In addition, those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0199] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present disclosure.

Claims

1. A display module, characterized in that: include: The display panel comprises a display area and a frame area arranged around the display area; A backlight module, comprising a light guide plate and an optical film layer, wherein the light guide plate has a first surface and a second surface arranged opposite to each other, the first surface is closer to the display panel than the second surface, the first surface comprises a first area and a second area arranged around the first area, the optical film layer is arranged between the display panel and the first surface, and an orthographic projection of the optical film layer on the first surface is located in the first area; An adhesive layer is disposed between the display panel and the first surface, wherein the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area.

2. The display module according to claim 1, characterized in that: The display panel comprises a first polarizer, an array substrate, a liquid crystal layer, a color film substrate and a second polarizer which are stacked in sequence, wherein the first polarizer is close to the optical film layer; The adhesive layer is disposed between the array substrate and the first surface, and an orthographic projection of the adhesive layer on the array substrate and an orthographic projection of the first polarizer on the array substrate do not overlap each other; and / or An air gap is provided between the first polarizer and the optical film layer. In a direction perpendicular to the display panel, a thickness of the adhesive layer is equal to a sum of thicknesses of the first polarizer, the air gap and the optical film layer.

3. The display module according to claim 1, characterized in that: The orthographic projection of the adhesive layer on the display panel is a first annular orthographic projection, the first annular orthographic projection surrounds the display area, and the first annular orthographic projection and the display area do not overlap each other.

4. The display module according to claim 1, characterized in that: The optical density of the adhesive layer is greater than or equal to 2; and / or In the first direction, the thickness of the adhesive layer ranges from 0.05 mm to 0.5 mm, and the first direction is perpendicular to the display panel. In the second direction, the width of the adhesive layer ranges from 0.3 mm to 2 mm, and the second direction is perpendicular to the first direction.

5. The display module according to claim 1, characterized in that: The orthographic projection of the light guide plate on the display panel is located within the display panel, and the orthographic projection of the light guide plate on the display panel covers the display area.

6. The display module according to claim 1, characterized in that: The light guide plate comprises a rigid light guide plate, and the rigid light guide plate comprises a glass light guide plate.

7. The display module according to any one of claims 1 to 6, characterized in that: The light guide plate further includes: a side surface adjacent to the first surface and the second surface; The backlight module further includes: a first light shielding layer covering the second area and the side surface.

8. The display module according to claim 7, characterized in that: The first light shielding layer comprises: A first shading portion covers the second area, wherein the orthographic projection of the first shading portion on the display panel is located in the frame area and has a gap with the display area, and the gap is greater than or equal to 0.5 mm.

9. The display module according to claim 7, characterized in that: The first light shielding layer comprises: A first shading portion covers the second area, wherein the orthographic projection of the first shading portion on the first surface is a second annular orthographic projection, and an inner edge of the second annular orthographic projection overlaps with an edge of the orthographic projection of the optical film layer on the first surface.

10. The display module according to claim 7, characterized in that: The first light shielding layer comprises: A first light shielding portion, covering the second area; a second light shielding portion, covering the side surface, wherein the second light shielding portion and the first light shielding portion are connected at a position where the side surface is adjacent to the first surface; In a direction perpendicular to the first surface, the thickness of the first shading portion ranges from 0.006 mm to 0.03 mm, and in a direction perpendicular to the side surface, the thickness of the second shading portion ranges from 0.006 mm to 0.03 mm.

11. The display module according to any one of claims 8 to 10, characterized in that: The backlight module further includes: a second light shielding layer covering the second surface of the light guide plate; and / or The backlight module also includes: A reflective sheet, arranged on one side of the second surface of the light guide plate; The bonding portion is arranged between the reflection sheet and the second surface.

12. The display module according to any one of claims 8 to 10, characterized in that: The side surface has a first circumferential angle at a position adjacent to the first surface, and the side surface has a second circumferential angle at a position adjacent to the second surface. The first circumferential angle and the second circumferential angle respectively include: a rounded corner and / or a chamfered corner.

13. The display module according to any one of claims 1 to 6, or any one of claims 8 to 10, characterized in that: In a direction perpendicular to the display panel, the width of the border area ranges from 1.0 mm to 1.4 mm; and / or In a direction perpendicular to the display panel, the thickness of the display module ranges from 0.9 mm to 3.0 mm.

14. A method for preparing a display module, characterized in that: include: Providing a display panel, comprising a display area and a frame area surrounding the display area; A backlight module is provided, comprising a light guide plate and an optical film layer, wherein the light guide plate has a first surface and a second surface arranged opposite to each other, the first surface is closer to the display panel than the second surface, the first surface comprises a first area and a second area arranged around the first area, the optical film layer is arranged on one side of the first surface of the light guide plate, and the orthographic projection of the optical film layer on the first surface is located in the first area; An adhesive layer is formed between the display panel and the first surface of the light guide plate, the orthographic projection of the adhesive layer on the display panel is located in the frame area, and the orthographic projection of the adhesive layer on the first surface is located in the second area.

15. A display device, characterized in that: Comprising a display module as described in any one of claims 1-13.

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