Liquid crystal display device

Abstract

An embodiment of the present invention discloses a liquid crystal display device, which optimizes the middle frame structure, that is, a first step structure is formed by a first supporting portion and a second sub-supporting portion, and a avoiding portion is provided for avoiding the light emitted by a backlight source so that the light emitted by the backlight source is incident on the edge area of ​​a diffuser plate. The light emitted by the light source can effectively reach the edge of the module, avoiding the problem of light being blocked.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a liquid crystal display device. Background Art

[0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, no radiation, etc., and is widely used in electronic products such as televisions, computers, and mobile phones. LCD display is a passive light-emitting display. The display screen itself cannot emit light, but is illuminated by the backlight module behind the display screen.

[0003] At present, "full screen" has become a standard in the mobile phone industry, and a very high screen-to-body ratio can bring users a wide field of vision. Full screen is not only applicable to mobile phones, but also to smart TVs after years of upgrading, and the body frame has evolved from a few centimeters to a few millimeters, and high screen-to-body ratio TVs have gradually entered the consumer field.

[0004] However, although some TVs claim to be full screen, they only have narrow borders. In fact, it is easy to find thick black borders around them, and they are not as narrow as expected. The borders of real full screen TVs are extremely narrow and can be almost ignored if you don't look closely. The integrated visual effect is obvious.

[0005] However, compared to mobile phones, the technical difficulties of true full-screen TVs are much greater due to the extremely narrow black matrix (BM) area at the edge of the screen. Not only does the panel design require a re-layout of the internal driving circuit and peripheral packaging design, but further breakthroughs are also needed in the screen bonding and assembly technology. Therefore, true full-screen TVs are rare in the market at present.

[0006] At present, the BM width of the edge of the full-screen LCD screen that has been developed and mass-produced is only 0.5mm-0.9mm. When the screen is assembled, the edge of the panel is usually bonded to the supporting surface of the middle frame through transparent UV glue. Since the transparent UV glue has a certain fluidity, part of the glue will enter the effective display area of ​​the panel, causing the pixels in the effective display area of ​​the LCD screen edge to be blocked. In addition, in the promotion of full-screen LCD display products, the matching of the full screen and the client backlight is also a problem that needs to be solved urgently. Summary of the invention

[0007] An embodiment of the present invention provides a liquid crystal display device, which is used to solve the problem that pixels at the edge of a display area of ​​a display panel are blocked, resulting in dark edges.

[0008] An embodiment of the present invention provides a liquid crystal display device, comprising:

[0009] A display panel having a display area and a non-display area surrounding the display area;

[0010] A back plate, arranged opposite to the display panel, the back plate comprising a bottom wall and a side wall extending from the bottom wall toward one side of the display panel;

[0011] A backlight source, located between the display panel and the back plate, the backlight source comprising a light source arranged on the bottom wall of the back plate and a diffusion plate arranged on the light emitting side of the light source;

[0012] A middle frame, the middle frame includes a first supporting portion and a second supporting portion connected to a side of the first supporting portion away from the display panel, and the non-display area of ​​the display panel and the first supporting portion are fixedly connected by a first adhesive layer; the second supporting portion includes: a first sub-supporting portion connected to a side of the first supporting portion away from the display panel, a second sub-supporting portion connected to a side of the first sub-supporting portion facing the light source, and an avoidance portion connected to a side of the second sub-supporting portion away from the first sub-supporting portion; a housing space is formed between the first sub-supporting portion and the avoidance portion, and the side wall of the back plate is accommodated in the housing space; the first supporting portion and the second sub-supporting portion form a first step structure, and the maximum distance between the top of the avoidance portion and the bottom wall surface of the back plate is smaller than the maximum distance between the top of the second sub-supporting portion and the bottom wall surface of the back plate; the edge area of ​​the diffuser plate is fixed on the second sub-supporting portion.

[0013] Optionally, the above-mentioned liquid crystal display device provided in an embodiment of the present invention further includes a light guide strip, wherein the light guide strip is located between the diffuser plate and the second sub-support portion, the cross-sectional shape of the avoidance portion is rectangular, and the avoidance portion and the second sub-support portion form a second step structure; the light guide strip is configured to diffuse the light emitted by the light source to the edge of the display area of ​​the display panel.

[0014] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the light guide bar is connected to the second sub-support portion via a first optical adhesive, and the light guide bar is connected to the diffuser plate via a second optical adhesive.

[0015] Optionally, the above-mentioned liquid crystal display device provided in an embodiment of the present invention further includes a light guide strip, which is located between the diffuser plate and the first supporting portion, and the cross-section of the avoidance portion is a right triangle, and the oblique surface of the right triangle is close to the light source; the light guide strip is configured to diffuse the light emitted from the diffuser plate to the edge of the display area of ​​the display panel.

[0016] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the light guide bar is connected to the first supporting portion via a first optical adhesive, and the light guide bar is connected to the diffusion plate via a second optical adhesive.

[0017] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the back plate further includes a third supporting portion connected to the side wall, the third supporting portion is arranged parallel to the bottom wall, and the third supporting portion is located at the bottom of the first sub-supporting portion;

[0018] The liquid crystal display device further comprises an outer frame, wherein the outer frame and the side edge of the display panel are fixedly connected via a second adhesive layer, and the second adhesive layer contains iron powder;

[0019] The liquid crystal display device further includes a magnetic strip, which is fixed on the third supporting portion and is configured to have an attractive force on the iron powder in the second bonding layer.

[0020] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the magnetic strip is located on a side of the third supporting portion away from the first sub-supporting portion, and the bottom surface of the magnetic strip is flush with the bottom surface of the bottom wall of the back plate.

[0021] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the magnetic strip is located between the third supporting portion and the first sub-supporting portion, and the bottom surface of the third supporting portion is flush with the bottom surface of the bottom wall of the back plate.

[0022] Optionally, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, the liquid crystal display device also includes an outer frame, the inner wall of the outer frame facing the display panel has a light-shielding foam, the side of the display panel facing the outer frame has a side sealant, and the outer frame is fixedly connected to the side of the display panel through the light-shielding foam and the side sealant.

[0023] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the middle frame and the outer frame are an integrated structure.

[0024] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, a groove is provided in a side wall of the outer frame at a location overlapping with the top of the first supporting portion, and the first adhesive layer is located in the groove.

[0025] Optionally, in the above-mentioned liquid crystal display device provided by an embodiment of the present invention, the shape of the groove is arc-shaped.

[0026] The beneficial effects of the embodiments of the present invention are as follows:

[0027] A liquid crystal display device provided by an embodiment of the present invention optimizes the middle frame structure, that is, the first support portion and the second sub-support portion form a first step structure, and an avoidance portion is provided for avoiding the light emitted by the backlight source so that the light emitted by the backlight source is incident on the edge area of ​​the diffuser plate. This can enable the light emitted by the light source to effectively reach the edge of the module and avoid the problem of light being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a liquid crystal display device provided by an embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0030] Figure 3 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0031] Figure 4 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0032] Figure 5 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0033] Figure 6 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0034] Figure 7 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0035] Figure 8 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0036] Fig. 9 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention;

[0037] Fig.10 A schematic structural diagram of another liquid crystal display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. And in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "include" or "comprise" and the like used in the present invention mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Inside", "outside", "upper", "lower", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, but are only intended to illustrate the content of the present invention. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0041] An embodiment of the present invention provides a liquid crystal display device, such as Figure 1 and Figure 2 As shown, including:

[0042] The display panel 1 has a display area AA and a non-display area BB surrounding the display area AA. In the embodiment of the present invention, only part of the display area AA and part of the non-display area BB are shown;

[0043] A back plate 2 is disposed opposite to the display panel 1, and includes a bottom wall 21 and a side wall 22 extending from the bottom wall 21 toward one side of the display panel 1;

[0044] A backlight source 3 is located between the display panel 1 and the back plate 2. The backlight source 3 includes a light source 31 disposed on the bottom wall 21 of the back plate 2 and a diffusion plate 32 disposed on the light emitting side of the light source 31.

[0045] The middle frame 4 includes a first support portion 41 and a second support portion 42 connected to the first support portion 41 away from the display panel 1; the non-display area BB of the display panel 1 and the first support portion 41 are fixedly connected through the first adhesive layer 5; the second support portion 42 includes: a first sub-support portion 421 connected to the first support portion 41 away from the display panel 1, a second sub-support portion 422 connected to the side of the first sub-support portion 421 facing the light source 31, and a side of the second sub-support portion 422 away from the first sub-support portion 421 The avoidance portion 423 is connected; a receiving space is formed between the first sub-support portion 421 and the avoidance portion 423, and the side wall 22 of the back panel 2 is received in the receiving space, so that the back panel 2 and the middle frame 4 can fit firmly; the first support portion 41 and the second sub-support portion 422 form a first step structure, and the maximum distance between the top of the avoidance portion 423 and the surface of the bottom wall 21 of the back panel 2 is smaller than the maximum distance between the top of the second sub-support portion 422 and the surface of the bottom wall 21 of the back panel 2; the edge area of ​​the diffuser plate 32 is fixed on the second sub-support portion 422.

[0046] The above-mentioned liquid crystal display device provided by the embodiment of the present invention optimizes the structure of the middle frame 4, that is, the first support portion 41 and the second sub-support portion 422 form a first step structure, and an avoidance portion 423 is provided for avoiding the light emitted by the backlight source 3 so that the light emitted by the backlight source 3 is incident on the edge area of ​​the diffuser 32. This can enable the light emitted by the light source 31 to effectively reach the edge of the module and avoid the problem of light being blocked.

[0047] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1 As shown, it also includes a light guide bar 6, which is located between the diffuser plate 32 and the second sub-support portion 422. The cross-sectional shape of the avoidance portion 423 is rectangular, and the avoidance portion 423 and the second sub-support portion 422 form a second step structure; the light guide bar 6 is configured to diffuse and guide the light emitted by the light source 31 to the edge of the display area AA of the display panel 1. In this way, the first step structure formed by the first support portion 41 and the second sub-support portion 422 and the second step structure formed by the avoidance portion 423 and the second sub-support portion 422 constitute a double step, which can guide the light emitted by the light source 31 to the edge of the display area AA of the display panel 1, avoid the light emitted by the light source 31 from being blocked, solve the problem that the edge pixels of the display area AA of the display panel 1 are blocked and cause the edge to be dark, and the setting of the light guide bar 6 of the present invention can further effectively disperse the light at the edge of the display area AA, while ensuring that the light at the edge of the display area AA is sufficient, and the light at the edge of the display area AA is not too bright.

[0048] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1As shown, the light guide bar 6 and the second sub-support portion 422 may be connected via a first optical adhesive 7 , and the light guide bar 6 and the diffuser plate 32 may be connected via a second optical adhesive 8 .

[0049] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 2 As shown, the display panel 1 further includes a light guide bar 6, which is located between the diffuser plate 32 and the first support portion 41. The cross section of the avoidance portion 423 is a right triangle, and the slope of the right triangle is close to the light source 31. The light guide bar 6 is configured to diffuse the light emitted from the diffuser plate 32 to the edge of the display area AA of the display panel 1. In this way, the avoidance portion 423 can guide the light emitted by the light source 31 to the edge of the display area AA of the display panel 1, thereby preventing the light emitted by the light source 31 from being blocked, solving the problem of dark edges caused by blocked pixels at the edge of the display area AA of the display panel 1, and the arrangement of the light guide bar 6 of the present invention can further effectively disperse the light at the edge of the display area AA, while ensuring that the light at the edge of the display area AA is sufficient, and the light at the edge of the display area AA is not too bright.

[0050] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 2 As shown, the light guide bar 6 and the first support portion 41 may be connected via a first optical adhesive 7 , and the light guide bar 6 and the diffuser plate 32 may be connected via a second optical adhesive 8 .

[0051] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 3-Figure 6 As shown, the back plate 2 further includes a third support portion 23 connected to the side wall 22, the third support portion 23 is arranged parallel to the bottom wall 21, and the third support portion 23 is located at the bottom of the first sub-support portion 421;

[0052] The liquid crystal display device further includes an outer frame 9, the outer frame 9 and the side edge of the display panel 1 are fixedly connected via a second adhesive layer 10, and the second adhesive layer 10 contains iron powder; Figure 3-Figure 6 The scheme is relative to Figure 1 and Figure 2 The solution does not require coating of side sealant 13 (Side sealing, to be introduced later), which can be operated more conveniently and quickly, reduce costs, and effectively improve production efficiency;

[0053] The liquid crystal display device further includes a magnetic strip 11, which is fixed on the third support portion 23, and is configured to have an attraction for the iron powder in the second adhesive layer 10. When the display panel 1 is attached to the backlight source 3 through the outer frame 9 and the middle frame 4, the embodiment of the present invention can efficiently and firmly attach an ultra-narrow BM (for example, 0.9 mm) full screen to the corresponding backlight source 3 by utilizing the attraction between the magnetic strip 11 and the iron powder in the second adhesive layer 10.

[0054] In a specific implementation, in the above-mentioned liquid crystal display device provided by the embodiment of the present invention, the second adhesive layer may be light-shielding foam or UV curing adhesive, but is not limited thereto.

[0055] In a specific implementation, in the above-mentioned liquid crystal display device provided by the embodiment of the present invention, the first adhesive layer may be double-sided foam adhesive or UV curing adhesive, but is not limited thereto.

[0056] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1 and Figure 2 As shown, taking the first adhesive layer 5 as UV curing glue as an example, during assembly, the UV curing glue can be pre-coated on the first supporting portion 41 of the middle frame 4 by a glue dispenser, and then the display panel 1 is placed above the first supporting portion 41 after alignment by an alignment device. After the UV glue is cured, the module assembly can be completed.

[0057] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 3-Figure 6 As shown, the first adhesive layer 5 is made of double-sided adhesive foam, which is cheaper than UV curing adhesive, and can further reduce costs. Since the double-sided adhesive foam is soft, in order to ensure a firm bond, a second adhesive layer 10 (such as UV curing adhesive) with iron powder added is applied in the gap between the outer frame 9 and the side of the display panel 1. This coating method has low requirements on equipment precision and is easy to control, without the risk of adhesive overflowing into the display panel 1.

[0058] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 3 and Figure 4 As shown, the magnetic strip 11 is located on a side of the third support portion 23 away from the first sub-support portion 421 , and the bottom surface of the magnetic strip 11 is flush with the bottom surface of the bottom wall 21 of the back plate 2 . Figure 3 and Figure 4 The setting of the position of the middle magnetic strip 11 will not increase the thickness of the liquid crystal display device.

[0059] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 5 and Figure 6 As shown, the magnetic strip 11 is located between the third support portion 23 and the first sub-support portion 421 , and the bottom surface of the third support portion 23 is flush with the bottom surface of the bottom wall 21 of the back plate 2 . Figure 5 and Figure 6 The setting of the position of the middle magnetic strip 11 will not increase the thickness of the liquid crystal display device.

[0060] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1 , Figure 2 , Figure 7-10 As shown, the liquid crystal display device also includes an outer frame 9, the inner wall of the outer frame 9 facing the display panel 1 has a light-shielding foam 12, and the side of the display panel 1 facing the outer frame 9 has a side sealant 13, and the outer frame 9 is fixedly connected to the side of the display panel 1 through the light-shielding foam 12 and the side sealant 13.

[0061] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 7-10 As shown, the middle frame 4 and the outer frame 9 can be an integral structure. In this way, the outer frame 9 is equivalent to the appearance part of the middle frame 4, that is, when the middle frame 4 is manufactured, the thickness of the middle frame 4 in the horizontal direction and the vertical direction can be increased, which is equivalent to directly using the upper edge of the middle frame 4 as the appearance part, which can reduce the thickness of the liquid crystal display device and reduce the cost.

[0062] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 7-10 As shown, a groove 91 is provided in the side wall of the outer frame 9 at the top overlapped with the first support portion 41, and the first adhesive layer 5 is located in the groove 91. In this way, the first adhesive layer 5 can be efficiently coated in the groove 91, the assembly and alignment of the display panel 1 is more convenient, the bonding is firm, and the glue overflow to the display area AA is avoided, thereby ensuring the display quality of the picture.

[0063] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 7-10 As shown, the shape of the groove 91 can be an arc, but is not limited thereto.

[0064] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1-Figure 10 As shown, the material of the light guide strip 6 can be a polyethylene terephthalate plastic (PET) substrate + a diffusion layer, that is, the light guide strip 6 is similar to a commonly used diffusion plate and can achieve the function of conducting and diffusing light, effectively solving the problem of pixel obstruction at the edge of the display area AA of the display panel 1.

[0065] It should be noted that Figure 1-Figure 10 The membrane layers with the same reference numerals have the same structure and function.

[0066] In a specific implementation, in order to reduce the thickness of the liquid crystal display device, in the above-mentioned liquid crystal display device provided by the embodiment of the present invention, as Figure 1-Figure 10 As shown, the thickness of the first optical adhesive 7 may be 0.25 mm-0.5 mm, and the thickness of the second optical adhesive 8 may be 0.25 mm-0.5 mm.

[0067] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1-Figure 10As shown, the non-display area BB of the display panel 1 includes a black matrix 14 , the black matrix 14 and the first support portion 41 are fixedly connected via a first adhesive layer 5 , and the width of the black matrix 14 is 0.5 mm-0.9 mm.

[0068] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1-Figure 10 As shown, the light source 31 may be an LED lamp, and a plurality of LED lamps are arranged in an array on the bottom wall of the back plate 2 , but the present invention is not limited thereto.

[0069] In a specific implementation, in the above-mentioned liquid crystal display device provided in an embodiment of the present invention, if Figure 1-Figure 10 As shown, an optical film material may also be disposed on the diffusion plate 32 to improve the brightness and uniformity of the light incident on the display panel 1 .

[0070] In a specific implementation, the above-mentioned liquid crystal display device provided in the embodiment of the present invention also includes other structures well known to those skilled in the art, such as a flexible circuit board, a printed circuit board, etc.

[0071] The above-mentioned liquid crystal display device provided in the embodiment of the present invention can be: any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, etc. The other essential components of the liquid crystal display device should be understood by ordinary technicians in the field, and will not be repeated here, nor should they be used as limitations on the present invention. The principle of solving the problem by the liquid crystal display device is similar to that of the aforementioned quantum dot light-emitting device, so the implementation of the liquid crystal display device can refer to the implementation of the aforementioned liquid crystal display device, and the repeated parts will not be repeated here.

[0072] A liquid crystal display device provided by an embodiment of the present invention optimizes the middle frame structure, that is, the first support portion and the second sub-support portion form a first step structure, and an avoidance portion is provided for avoiding the light emitted by the backlight source so that the light emitted by the backlight source is incident on the edge area of ​​the diffuser plate. This can enable the light emitted by the light source to effectively reach the edge of the module and avoid the problem of light being blocked.

[0073] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other 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 that fall within the scope of the present invention.

[0074] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A liquid crystal display device, characterized in that: include: A display panel having a display area and a non-display area surrounding the display area; A back plate, arranged opposite to the display panel, the back plate comprising a bottom wall and a side wall extending from the bottom wall toward one side of the display panel; A backlight source, located between the display panel and the back plate, the backlight source comprising a light source arranged on the bottom wall of the back plate and a diffusion plate arranged on the light emitting side of the light source; A middle frame, the middle frame comprising a first supporting portion and a second supporting portion connected to a side of the first supporting portion away from the display panel, the non-display area of ​​the display panel and the first supporting portion are fixedly connected by a first adhesive layer; the second supporting portion comprises: a first sub-supporting portion connected to a side of the first supporting portion away from the display panel, a second sub-supporting portion connected to a side of the first sub-supporting portion facing the light source, and an avoidance portion connected to a side of the second sub-supporting portion away from the first sub-supporting portion; a containing space is formed between the first sub-supporting portion and the avoidance portion, and the side wall of the back plate is contained in the containing space; The first supporting portion and the second sub-supporting portion form a first step structure, the maximum distance between the top of the avoidance portion and the bottom wall surface of the back plate is smaller than the maximum distance between the top of the second sub-supporting portion and the bottom wall surface of the back plate; the edge area of ​​the diffuser plate is fixed on the second sub-supporting portion.

2. The liquid crystal display device according to claim 1, wherein It also includes a light guide bar, which is located between the diffuser plate and the second sub-support portion. The cross-sectional shape of the avoidance portion is rectangular, and the avoidance portion and the second sub-support portion form a second step structure; the light guide bar is configured to diffuse the light emitted by the light source to the edge of the display area of ​​the display panel.

3. The liquid crystal display device according to claim 2, wherein: The light guide bar is connected to the second sub-support portion via a first optical adhesive, and the light guide bar is connected to the diffusion plate via a second optical adhesive.

4. The liquid crystal display device according to claim 1, wherein It also includes a light guide bar, which is located between the diffuser plate and the first support portion. The cross-section of the avoidance portion is a right triangle, and the slope of the right triangle is close to the light source. The light guide bar is configured to diffuse the light emitted from the diffuser plate to the edge of the display area of ​​the display panel.

5. The liquid crystal display device according to claim 4, wherein: The light guide bar is connected to the first supporting portion via a first optical adhesive, and the light guide bar is connected to the diffusion plate via a second optical adhesive.

6. The liquid crystal display device according to claim 1, wherein: The back plate further comprises a third support portion connected to the side wall, the third support portion is arranged parallel to the bottom wall, and the third support portion is located at the bottom of the first sub-support portion; The liquid crystal display device further comprises an outer frame, wherein the outer frame and the side edge of the display panel are fixedly connected via a second adhesive layer, and the second adhesive layer contains iron powder; The liquid crystal display device further includes a magnetic strip, which is fixed on the third supporting portion and is configured to have an attractive force on the iron powder in the second bonding layer.

7. The liquid crystal display device according to claim 6, wherein: The magnetic strip is located at a side of the third supporting portion away from the first sub-supporting portion, and the bottom surface of the magnetic strip is flush with the bottom surface of the bottom wall of the back plate.

8. The liquid crystal display device according to claim 6, wherein: The magnetic strip is located between the third supporting portion and the first sub-supporting portion, and the bottom surface of the third supporting portion is flush with the bottom surface of the bottom wall of the back plate.

9. The liquid crystal display device according to any one of claims 1 to 5, characterized in that: The liquid crystal display device also includes an outer frame, the inner wall of the outer frame facing the display panel has a light-shielding foam, the side of the side of the display panel facing the outer frame has a side sealant, and the outer frame is fixedly connected to the side of the display panel through the light-shielding foam and the side sealant.

10. The liquid crystal display device according to claim 9, wherein: The middle frame and the outer frame are an integrated structure.

11. The liquid crystal display device according to claim 10, wherein: A groove is formed in the side wall of the outer frame at a location where the side wall overlaps with the top of the first supporting portion, and the first adhesive layer is located in the groove.

12. The liquid crystal display device according to claim 11, wherein: The groove is in an arc shape.

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