CN113031335A

CN113031335A - Display device

Info

Publication number: CN113031335A
Application number: CN202110311289.9A
Authority: CN
Inventors: 余冬庆
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-06-25

Abstract

The application provides a display device, including: the backlight module comprises a backlight box and a backlight source, wherein the backlight box is provided with an accommodating cavity which is formed by enclosing a bottom wall and a side wall, the backlight source is accommodated in the accommodating cavity, and the surface of the side wall, which is far away from the backlight source, is provided with at least one first buckling part; the liquid crystal panel is arranged on the light emergent side of the backlight module; and the protective cover plate comprises a protruding part, the protruding part is positioned on the surface of the protective cover plate facing the liquid crystal panel, the protruding part faces the surface of the liquid crystal panel and is provided with a second buckling part, and the first buckling part and the second buckling part are matched to form a buckling structure. This application replaces some glue to fix protection apron and backlight unit through buckle structure, has avoided gluing structure and module adhesion, has improved display device's reliability.

Description

Display device

Technical Field

The invention relates to the field of display, in particular to a display device.

Background

The Liquid Crystal Display (LCD) module design tends to be light, thin and narrow, and particularly, the narrow bezel development requirement is particularly prominent in the market where the OLED Display device is rising. Along with the continuous development of narrow frame, the frame of module structural design also more and more narrow. In order to realize the narrow frame of the liquid crystal display device, the assembled module is usually subjected to a glue sealing process so as to realize the bonding of parts in the module structure and the reinforcement of the module structure; however, the display screen is limited by the requirement of narrowing the frame, and the width of the dispensing contact position between the display screen and the housing is small, so that the adhesive force between the display screen and the housing is insufficient. The display screen is easily degummed in the use process of the display device, and in the process of sealing the glue, the glue can fill the joint of the protective cover plate and the backlight module, so that the sealing glue structure bonding module is not favorable for the maintenance and replacement of each film layer in the display device.

Disclosure of Invention

The application provides a display device has avoided gluing structure and module adhesion, has improved display device's reliability.

A display device, comprising:

the backlight module comprises a backlight box and a backlight source, wherein the backlight box is provided with an accommodating cavity which is formed by enclosing a bottom wall and a side wall, the backlight source is accommodated in the accommodating cavity, and the surface of the side wall, which is far away from the backlight source, is provided with at least one first buckling part;

the liquid crystal panel is arranged on the light emergent side of the backlight module; and

the protection apron, the protection apron includes the protruding portion, the protruding portion is located the protection apron orientation the surface of liquid crystal display panel, the protruding portion orientation the surface of liquid crystal display panel has the second buckling parts, first buckling parts with the cooperation of second buckling parts forms buckle structure.

In the embodiment of this application, the protruding portion has first sub-protruding portion, first sub-protruding portion be located protection cover plate with between the second buckling parts and set up in the protruding portion is close to the one end of protection cover plate, the width of first sub-protruding portion is greater than the width of second buckling parts, first sub-protruding portion is kept away from one side of liquid crystal display panel with the second buckling parts is kept away from one side of liquid crystal display panel flushes, the side of liquid crystal display panel with the laminating of first sub-protruding portion.

In the implementation manner of the application, the display device further comprises an optical adhesive layer and a first polarizing layer, the first polarizing layer is arranged between the liquid crystal panel and the protective cover plate, the optical adhesive layer is adhered between the first polarizing layer and the protective cover plate, and the optical adhesive layer and the side edge of the first polarizing layer are both attached to the first sub-protruding portion.

In an embodiment of the present application, the protrusion further has a second sub-protrusion, the second sub-protrusion is located between the first sub-protrusion and the second buckling portion, a width of the second sub-protrusion is smaller than a width of the first sub-protrusion, and a side of the second sub-protrusion away from the liquid crystal panel is flush with a side of the first sub-protrusion away from the liquid crystal panel.

In an embodiment of the application, the display device further includes a second polarizing layer, the second polarizing layer is disposed between the liquid crystal panel and the backlight module, and a side of the second polarizing plate is attached to the second sub-protrusion.

In an embodiment of the present application, the protrusion further has a third sub-protrusion, the third sub-protrusion is located between the second sub-protrusion and the second fastening portion, a width of the third sub-protrusion is smaller than a width of the second sub-protrusion and also smaller than a width of the second fastening portion, and a side of the third sub-protrusion away from the liquid crystal panel is flush with a side of the second sub-protrusion away from the liquid crystal panel.

In an embodiment of the application, the display device further includes a dimming function layer, the dimming function layer is disposed on one side of the backlight module facing the liquid crystal panel and attached to the surface of the second sub-protrusion facing the third sub-protrusion, and the thickness of the dimming function layer is smaller than the length of the third sub-protrusion.

In an embodiment of the present application, the display device further includes a light shielding layer disposed between a surface of the second sub-protrusion facing the third sub-protrusion and the dimming function layer.

In the embodiment of this application, the lateral wall including connect gradually in first part, second part and the third part of diapire, first buckling parts is located the second part, the third part is kept away from the surface of backlight with the laminating of third sub-protruding portion.

In an embodiment of the present application, a gap is disposed between the protrusion and the liquid crystal panel and the backlight module.

In an embodiment of the present application, the gap has a width of 0.05 mm to 0.15 mm.

In an embodiment of the present application, the gap is filled with glue.

Drawings

In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application. Other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive efforts shall fall within the scope of the present application.

Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a display device according to a second embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a display device according to a third embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a fourth embodiment of a display device provided in the present application.

Fig. 5 is a schematic plan view of an electronic device provided in the present application.

Detailed Description

The present application will be described in detail with reference to specific embodiments.

Referring to fig. 1, a display device 100 includes a backlight module 10, a liquid crystal panel 20, and a protective cover 30. The liquid crystal panel 20 is disposed on the light-emitting side of the backlight module 10. Specifically, the liquid crystal panel 20 is disposed between the backlight module 10 and the protective cover 30.

The backlight module 10 includes a backlight box 11 and a backlight 12. The backlight box 11 has a bottom wall 111 and a side wall 112. The bottom wall 111 and the side wall 112 enclose a receiving cavity 113. The backlight 12 is accommodated in the accommodating chamber 113. The surface of the sidewall 112 away from the backlight 12 has at least one first fastening portion 1121. The number of the first fastening portions 1121 may be 2, 3 or more, and a plurality of first fastening portions 1121 are located on the surface of the sidewall 112 away from the backlight 12. The present application is described with reference to one first engagement portion 1121, and the first engagement portion 1121 is not intended to limit the present application.

The protective cover 30 includes a protrusion 31. The protrusion 31 is located on the surface of the protective cover 30 facing the liquid crystal panel 20. The surface of the protrusion 31 facing the liquid crystal panel 20 has a second engaging portion 311. The first engaging portion 1121 and the second engaging portion 311 cooperate to form a locking structure. When the number of the first engaging portions 1121 is 2, 3, or more, the number of the second engaging portions 311 is 2, 3, or more. The second engaging portions 311 are located on the surface of the protruding portion 31 facing the liquid crystal panel 20. The number of the first fastening portions 1121 corresponds to the number of the second fastening portions 311, so as to attach each module to the protective cover 30. The provision of the plurality of first engaging portions 1121 and second engaging portions 311 can further improve the reliability of the display device.

Specifically, the protective cover 30 and the protrusion 31 may be integrally formed, or may be welded, adhered or otherwise formed, and are not limited herein. The protective cover 30 has advantages of high strength and scratch resistance, and may protect the surface of the display device 100 from external damage as an outermost component of the display device 100.

Specifically, the liquid crystal panel 20 includes a color filter substrate 21, a liquid crystal layer 22, and an array substrate 23, which are sequentially stacked. The color film substrate 21 is located between the liquid crystal layer 22 and the protective cover 30. The color filter substrate 21 includes a plurality of color filters. White light emitted from the backlight 12 of the backlight module 10 passes through the liquid crystal layer 22 and is irradiated to the color filter. The color filter forms red light, green light and blue light corresponding to the light resistances of the red, green and blue colors on each pixel, and finally forms a color image in human eyes through the combination of the three lights.

The backlight module 10 is used for providing the display device 100 with a uniformly distributed light source and sufficient brightness, so that the display device 100 can normally display images.

The backlight box 11 may be a metal case. Specifically, the backlight box 11 may be formed of a magnesium alloy, stainless steel, or the like. The material of the backlight box 11 in the present application is not limited thereto, and other means may be adopted. For example, the backlight box 11 may also be a plastic case or a ceramic case.

The backlight 12 must have high brightness and long life. There are Cold Cathode Fluorescent Lamps (CCFLs), hot Cathode Fluorescent lamps (CCFLs), Light Emitting Diodes (LEDs), and Electroluminescent panels (ELs).

According to the application, the buckle structure is arranged to replace a glue dispensing process to fix the protective cover plate 30 and the backlight module 10, so that a closed space is formed, the adhesion of the glue sealing structure and the backlight module 10 is avoided, and the reliability of the display device 100 is improved. In addition, this application has still realized display device's narrow frame, has promoted display device's screen and has occupied than.

The projection 31 has a first sub-projection 312. The first sub-protrusion 312 is located between the protective cover 30 and the second buckling portion 311 and is disposed at one end of the protrusion 31 close to the protective cover 30. The width D1 of the first sub-protrusion 312 is greater than the width D4 of the second fastening portion 311. The side of the first sub-protrusion 312 away from the liquid crystal panel 20 is flush with the side of the second fastening part 311 away from the liquid crystal panel 20. The side of the liquid crystal panel 20 is attached to the first sub-protrusion 312.

By setting the width D1 of the first sub-protrusion 312 to be greater than the width D4 of the second engaging portion 311, the liquid crystal panel 20 and the first sub-protrusion 312 can be seamlessly attached, and the reliability of the display device 100 is improved.

The display device 100 further includes an optical glue layer 40 and a first polarizing layer 50. The first polarizing layer 50 is disposed between the liquid crystal panel 20 and the protective cover 30. The optical adhesive layer 40 is adhered between the first polarizing layer 50 and the protective cover 30. The optical adhesive layer 40 and the first polarizing layer 50 are attached to the first sub-protrusions 312 at the side edges. Specifically, the first polarizing layer 50 is disposed between the optical adhesive layer 40 and the color filter substrate 21.

This application is all laminated with first sub-protruding portion 312 through the side that sets up optical cement layer 40 and first polarisation layer 50, can make optical cement layer 40 and first polarisation layer 50 and the seamless laminating of first sub-protruding portion 312, improves display device 100's reliability.

The Optical Clear Adhesive (OCA) 40 is a double-sided Adhesive tape without a base material. The OCA has the characteristics of colorless transparency, high light transmittance (light transmittance is more than 99%), high adhesion, high weather resistance, water resistance, high temperature resistance, ultraviolet resistance and the like, has controlled thickness, can provide uniform spacing, and does not generate the problems of yellowing, peeling and deterioration after long-term use.

The application improves the adhesion between the first polarizing layer 50 and the protective cover plate 30 by arranging the optical adhesive layer 40 between the first polarizing layer 50 and the protective cover plate 30, thereby improving the reliability of the display device 100.

The projection 31 also has a second sub-projection 313. The second sub-protrusion 313 is located between the first sub-protrusion 312 and the second fastening part 311. The width D2 of the second sub-protrusion 313 is less than the width D1 of the first sub-protrusion 312. The side of the second sub-protrusion 313 away from the liquid crystal panel 20 is flush with the side of the first sub-protrusion 312 away from the liquid crystal panel 20.

By setting the width D2 of the second sub-protrusion 313 to be smaller than the width D1 of the first sub-protrusion 312, the application can improve the adhesion between the protrusion 31 and each film layer in the display device 100, thereby improving the reliability of the display device 100.

The display device 100 further comprises a second polarizing layer 60. The second polarizing layer 60 is disposed between the liquid crystal panel 20 and the backlight module 10. The side of the second polarizer 60 is attached to the second sub-protrusion 313.

The first polarizing layer 50 and the second polarizing layer 60 cooperate to assist the liquid crystal panel 20 in displaying images.

According to the display device 100, the side edge of the second polarizer 60 is attached to the second sub-protrusion 313, so that the second polarizer 60 and the second sub-protrusion 313 can be attached in a seamless mode, and the reliability of the display device 100 is improved.

The tab 31 also includes a third sub-tab 314. The third sub-protrusion 314 is located between the second sub-protrusion 313 and the second buckling portion 311. The width D3 of the third sub-protrusion 314 is smaller than the width D2 of the second sub-protrusion 313 and is also smaller than the width D4 of the second fastening portion 311. The side of the third sub-protrusion 314 away from the liquid crystal panel 20 is flush with the side of the second sub-protrusion 313 away from the liquid crystal panel 20.

According to the present application, the width D3 of the third sub-protrusion 314 is smaller than the width D2 of the second sub-protrusion 313 and smaller than the width D4 of the second engaging portion 311, so that the adhesion between the protrusion 31 and each film layer in the display device 100 can be improved, and the second engaging portion 311 and the first engaging portion 1121 can be fastened and fixed, thereby improving the reliability of the display device 100.

The display device 100 further comprises a dimming function layer 70. The dimming function layer 70 is disposed on one side of the backlight module 10 facing the liquid crystal panel 20, and is attached to a surface of the second sub-protrusion 313 facing the third sub-protrusion 314. The thickness w of the dimming function layer 70 is less than the length b of the third sub-protrusion 314.

The dimming function layer 70 may include a diffuser plate, a brightness enhancement film, and the like.

The diffusion plate can provide a uniform surface light source for the liquid crystal panel 20, and a conventional diffusion plate mainly adds particulate matters as scattering particles into a diffusion plate base material, while the fine particles of the conventional diffusion plate are dispersed between tree finger layers, so that light continuously passes through two media with different refractive indexes when passing through the diffusion plate, and meanwhile, the light is subjected to a plurality of refraction, reflection and scattering phenomena, thereby generating an optical diffusion effect.

The brightness enhancement film can control the light-emitting angle of emergent light, and the utilization efficiency of the light source is improved. After the light is emitted from the diffuser, the directivity of the light is poor, so the prism sheet must be used to correct the direction of the light, and the principle is to converge the light and improve the front luminance by means of the refraction and reflection of the light, so as to increase the use efficiency of the light after being emitted from the diffuser, and to improve the luminance of the backlight module 10 by more than 60%. Brightness enhancement films are made primarily of Polyester (Polyester) or Polycarbonate (Polycarbonate) and have a surface structure that is generally prismatic or semi-cylindrical.

In the present application, the dimming function layer 70 is disposed on one side of the backlight module 10 facing the liquid crystal panel 20, and is attached to the surface of the second sub-protrusion 313 facing the third sub-protrusion 314. The thickness w of the dimming function layer 70 is smaller than the length b of the third sub-protrusion 314, so that the adhesion between the dimming function layer 70 and the protrusion 31 is improved, the second engagement portion 311 and the first engagement portion 1121 are ensured to be engaged and fixed, and the reliability of the display device 100 is improved.

The backlight module 10 further includes a light guide plate. The light guide plate is disposed between the dimming function layer 70 and the backlight 12. The light guide plate is used to guide the direction of light to improve the brightness of the liquid crystal panel 20 and to control the brightness uniformity of the liquid crystal panel 20.

The backlight module 10 further includes a reflective sheet. The reflective sheet is disposed on a side of the light guide plate away from the dimming function layer 70. The reflective sheet is used for reflecting light coming out of the back surface of the light guide plate back to the light guide plate. The reflective sheet may be a metal reflective sheet or a reflective sheet of a white plastic material.

In one embodiment of the present application, the display device 100 further includes a light-shielding layer 80. The light shielding layer 80 is located between the surface of the second protrusion 313 facing the third sub-protrusion 314 and the dimming function layer 70.

The light-shielding layer 80 may prevent light leakage from the side of the display device 100.

Referring to fig. 2, in an embodiment of the present disclosure, the display device 100 further includes a first light-shielding layer 81. The first light shielding layer 81 is disposed between the surface of the first sub-protrusion 312 facing the second sub-protrusion 313 and the second polarizing layer 60.

The first light shielding layer 81 can reduce the reflectivity of the metal layer on the array substrate 23 and can also prevent light leakage from the side of the display device 100.

Referring to fig. 3, in one embodiment of the present application, an end of the third sub-protrusion 314 facing the second sub-protrusion 313 is disposed at the opening 71. The opening 71 faces the dimming function layer 70. The opening 71 is filled with adhesive. The adhesive is attached between the third sub-protrusion 314 and the dimming function layer 70.

The adhesive glue is soft glue material. The soft rubber material has certain hardness, but needs to be capable of compression deformation. Specifically, the adhesive may be a hot melt adhesive, which is a plastic adhesive and has a physical state that changes with temperature within a certain temperature range and a chemical property that does not change. Compared with common glue, the hot melt adhesive has the advantages of higher adhesive strength, better curing effect, excellent adhesive strength, temperature resistance, chemical corrosion resistance and aging resistance, easier control of the thickness of the glue, and better capability of meeting the design requirement of narrow frames of electronic equipment. In addition, the hot melt adhesive belongs to thermoplastic polyurethane, and products bonded by the hot melt adhesive are easier to detach or repair. The soft rubber material comprises: silicone (Silcone), Rubber (Rubber), Thermoplastic polyurethane Elastomer rubbers (TPU), and Thermoplastic elastomers (TPE).

In the present invention, the opening 71 is provided at the end of the third sub-protrusion 314 facing the second sub-protrusion 313, and the adhesive is filled in the opening 71, so that the adhesion between the light modulation function layer 70 and the protrusion 31 can be improved, thereby improving the reliability of the display device 100.

The side wall 112 includes a first portion 1122, a second portion 1123, and a third portion 1124 connected to the bottom wall 111 in that order. The first fastening portion 1121 is located at the second portion 1123. The surface of the third portion 1124 facing away from the backlight 12 is attached to the third sub-protrusion 314.

The surface of the third portion 1124 of the sidewall 112 away from the backlight 12 is attached to the third sub-protrusion 314, so that the attachment between the backlight module 10 and the protrusion 31 is improved, and the reliability of the display device 100 is improved.

Referring to fig. 4, in one embodiment of the present disclosure, a gap 90 is disposed between the protrusion 31 and the liquid crystal panel 20 and the backlight module 10.

The gaps 90 include a first gap 91, a second gap 92, a third gap 93, and a fourth gap 94. The first gap 91 is provided between the liquid crystal panel 20 and the protrusion 31. The second gap 92 is disposed between the second polarizing layer 60 and the protrusion 31. The third gap 93 is provided between the dimming function layer 70 and the protrusion 31. The fourth gap 94 is disposed between the sidewall 112 of the backlight module 10 and the protrusion 31.

By arranging the gap 90 between the protrusion 31 and the liquid crystal panel 20 and between the protrusion 31 and the backlight module 10, the application can absorb the error formed by the lamination between the films in the display device 100, improve the lamination between the films and the protrusion 31 in the display device 100, and improve the reliability of the display device 100.

The width d of the gap 90 is 0.05 mm to 0.15 mm. Specifically, the width d of the gap 90 may be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, or 0.15 mm.

The widths of the first gap 91, the second gap 92, the third gap 93 and the fourth gap 94 may be the same or different, and the present application does not limit the widths, and the widths may be within a range allowed by process conditions.

By setting the width d of the gap 90 to be 0.05 mm-0.15 mm, the application can absorb the error formed by the lamination between the film layers in the display device 100, improve the lamination between the film layers and the protruding part 31 in the display device 100, and improve the reliability of the display device 100.

In one embodiment of the present application, the gap 90 is filled with glue 95.

Specifically, the present application fills the first glue in the first gap 91. The present application fills the second glue in the second gap 92. In the application, the third glue is filled in the third gap 93. The present application fills fourth glue in fourth gap 94. The first glue, the second glue, the third glue and the fourth glue may be the same glue 95. The glue 95 is a soft glue material. Glue 95 may be a hot melt adhesive.

In the present invention, the gap 90 is filled with the glue 95, so that the adhesion between each film layer and the protruding portion 31 in the display device 100 can be improved, and the reliability of the display device 100 can be improved.

In one embodiment of the present application, the gap 90 is filled with a cushion pad.

According to the display device 100, the buffer gasket is filled in the gap 90, so that when the display device 100 shakes, the damage of each film layer in the display device 100 due to collision can be avoided, and the reliability of the display device 100 is improved.

Referring to fig. 5, the present application further provides an electronic device 1000. The electronic device 1000 comprises a display device 100 as described in any of the previous embodiments. The electronic setup 1000 includes, but is not limited to, the following types: a rollable or foldable mobile phone, a watch, a bracelet, a television or other wearable display or touch control electronic device, and a flexible smart phone, a tablet computer, a notebook computer, a desktop display, a television, smart glasses, a smart watch, an ATM machine, a digital camera, a vehicle-mounted display, a medical display, an industrial display, an electronic paper book, an electrophoretic display device, a game machine, a transparent display, a double-sided display, a naked-eye 3D display, a mirror display device, a semi-reflective and semi-transparent display device, etc.

The application provides an electronic device comprising a display device as described in any of the previous embodiments. The display device includes: the backlight module comprises a backlight box and a backlight source, wherein the backlight box is provided with an accommodating cavity which is formed by enclosing a bottom wall and a side wall, the backlight source is accommodated in the accommodating cavity, and the surface of the side wall, which is far away from the backlight source, is provided with at least one first buckling part; the liquid crystal panel is arranged on the light emergent side of the backlight module; and the protective cover plate comprises a protruding part, the protruding part is positioned on the surface of the protective cover plate facing the liquid crystal panel, the protruding part faces the surface of the liquid crystal panel and is provided with a second buckling part, and the first buckling part and the second buckling part are matched to form a buckling structure. This application replaces some glue to fix protection apron and backlight unit through buckle structure, has avoided gluing structure and module adhesion, has improved display device's reliability to electronic equipment's reliability has been improved.

In summary, although the present application has been described with reference to the above embodiments, the above embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.

Claims

1. A display device, comprising:

2. The display device according to claim 1, wherein the protrusion has a first sub-protrusion, the first sub-protrusion is located between the protective cover and the second fastening portion and disposed at an end of the protrusion close to the protective cover, a width of the first sub-protrusion is greater than a width of the second fastening portion, a side of the first sub-protrusion away from the liquid crystal panel is flush with a side of the second fastening portion away from the liquid crystal panel, and a side edge of the liquid crystal panel is attached to the first sub-protrusion.

3. The display device according to claim 2, further comprising an optical adhesive layer and a first polarizing layer, wherein the first polarizing layer is disposed between the liquid crystal panel and the protective cover plate, the optical adhesive layer is adhered between the first polarizing layer and the protective cover plate, and the optical adhesive layer and the first polarizing layer are adhered to the first sub-protrusions at the side edges.

4. The display device according to claim 2, wherein the protrusion further has a second sub-protrusion, the second sub-protrusion is located between the first sub-protrusion and the second fastening portion, the width of the second sub-protrusion is smaller than that of the first sub-protrusion, and a side of the second sub-protrusion away from the liquid crystal panel is flush with a side of the first sub-protrusion away from the liquid crystal panel.

5. The display device according to claim 4, further comprising a second polarizing layer disposed between the liquid crystal panel and the backlight module, wherein a side of the second polarizing plate is attached to the second sub-protrusion.

6. The display device according to claim 4, wherein the protrusion further has a third sub-protrusion, the third sub-protrusion is located between the second sub-protrusion and the second fastening portion, the width of the third sub-protrusion is smaller than the width of the second sub-protrusion and smaller than the width of the second fastening portion, and a side of the third sub-protrusion away from the liquid crystal panel is flush with a side of the second sub-protrusion away from the liquid crystal panel.

7. The display device according to claim 6, further comprising a dimming function layer disposed on a side of the backlight module facing the liquid crystal panel and attached to a surface of the second sub-protrusion facing the third sub-protrusion, wherein a thickness of the dimming function layer is smaller than a length of the third sub-protrusion.

8. The display device according to claim 7, further comprising a light shielding layer provided between a surface of the second sub-protrusion facing the third sub-protrusion and the dimming function layer.

9. The display device according to claim 7, wherein the side wall includes a first portion, a second portion and a third portion sequentially connected to the bottom wall, the first fastening portion is located in the second portion, and a surface of the third portion away from the backlight source is attached to the third sub-protrusion.

10. The display device according to claim 1, wherein a gap is provided between the protrusion and the liquid crystal panel and the backlight module.

11. A display device as claimed in claim 10, characterised in that the width of the gap is 0.05-0.15 mm.

12. The display device according to claim 11, wherein the gap is filled with glue.