Backlight module and display device

Abstract

The invention provides a display module and a display device.The display module comprises a light source substrate and a reflection cup cover, the light source substrate comprises a plurality of light-emitting elements arranged in an array, the reflection cup cover comprises a plurality of reflection cups connected with one another, each reflection cup is provided with an opening, and at least part of the area of a connecting part between every two adjacent reflection cups is provided with a groove; after the reflection cup and the light source substrate are arranged in an attached mode, the light-emitting element is located in the opening, the reflection face of the reflection cup faces the light-emitting element, and the sealed cavity is formed between the groove and the light source substrate, so that the adhesion of the reflection cup and the light source substrate is improved, local upwarp of the reflection cup in the using process can be effectively prevented, and the problem of uneven light emitting is solved.

Description

Technical Field

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

[0002] With the continuous development of liquid crystal display technology, liquid crystal display devices have been widely used in all aspects of life. Liquid crystal display devices include backlight modules and display panels. The backlight module provides light source for the display panel and is an indispensable part of the liquid crystal display device. Its light-emitting effect will directly affect the visual effect of the liquid crystal display device.

[0003] The types of backlight modules include cold cathode fluorescent lamp (CCFL) backlight modules, edge-emitting LED (LED) backlight modules, direct-type backlight modules, etc. In order to achieve better partition display effects in direct-type backlight modules, reflective cups are generally used to isolate the direct-type backlight modules into display partitions. However, during the use of existing reflective cups, problems such as local warping, light leakage, and uneven light emission may occur, which affect the light emission effect of the backlight module. Therefore, there is still much room for improvement in display modules, both in terms of process and design. Summary of the invention

[0004] Based on the above problems, the present invention provides a backlight module and a display device. A groove is set in at least a part of the connecting area between adjacent reflective cups of the reflective cup cover. After the reflective cup is bonded to the light source substrate, a closed space is formed between the groove and the light source substrate. In this way, the adhesion between the reflective cup and the light source substrate can be improved, and local warping during use can be effectively prevented, thereby improving the problem of uneven light emission.

[0005] In order to solve the above technical problems, the present invention provides a backlight module, comprising:

[0006] A light source substrate, comprising a plurality of light emitting elements arranged in an array;

[0007] A reflector cup cover, comprising a plurality of reflector cups connected to each other, wherein the reflector cups are provided with openings, and at least a portion of a connecting portion between adjacent reflector cups is provided with at least one groove;

[0008] The reflective cup is fitted with the light source substrate, at least one light emitting element is located in the opening, and the reflective surface of the reflective cup faces the light emitting element; a closed cavity is formed between the groove and the light source substrate.

[0009] On the other hand, the present invention further provides a method for preparing a backlight module, which is used to prepare the backlight module provided above, and the preparation method comprises:

[0010] A light source substrate is provided; the light source substrate comprises a plurality of light emitting elements arranged in an array;

[0011] The reflector cup cover is manufactured by an integrated molding process, wherein the reflector cup cover comprises a plurality of reflector cups connected to each other, the reflector cups are provided with openings, and at least a portion of the connecting portion between adjacent reflector cups is provided with at least one groove;

[0012] Laminating the reflective cup cover and the light source substrate so that the light emitting element is located in the opening;

[0013] A closed cavity is formed between the groove and the light source substrate.

[0014] On the other hand, the present invention further provides a display device, comprising the above-mentioned backlight module.

[0015] The backlight module and display module provided by the present invention provide a groove in at least a partial area of ​​the connecting portion between adjacent reflective cups, and the reflective cup cover fits with the light source substrate, so that a closed cavity is formed between the groove and the light source substrate. The closed space can make the reflective cup cover adhere more closely to the surface of the light source substrate, thereby avoiding local warping of the reflective cup during use and improving the problem of uneven light emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a backlight module provided by an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic cross-sectional view of a backlight module along the AA' direction;

[0018] Figure 3 for Figure 1 A schematic cross-sectional view of another backlight module along the AA' direction;

[0019] Figure 4 A schematic diagram of a groove surface of a backlight module provided by an embodiment of the present invention;

[0020] Figure 5 for Figure 4 An enlarged schematic diagram of area a and area b of a backlight module;

[0021] Figure 6 A schematic diagram of a groove surface of another backlight module provided by an embodiment of the present invention;

[0022] Figure 7 for Figure 6 An enlarged schematic diagram of region c of a backlight module;

[0023] Figure 8 A schematic diagram of a groove surface of another backlight module provided by an embodiment of the present invention;

[0024] Fig. 9 for Figure 8 An enlarged schematic diagram of the d region of a backlight module;

[0025] Fig.10 is a schematic diagram of a method for preparing a backlight module provided by an embodiment of the present invention;

[0026] Fig.11 A schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] Based on one or more of the above problems, an embodiment of the present invention provides a backlight module, which can improve the problem of partial warping of a reflective cup of the backlight module. Figure 1 is a schematic diagram of a backlight module provided by an embodiment of the present invention, Figure 2 for Figure 1 A schematic cross-sectional view of a backlight module along the AA' direction, see Figure 1 and Figure 2 A backlight module provided by an embodiment of the present invention includes a light source substrate 20 and a reflective cup cover 30. The light source substrate 20 includes a plurality of light emitting elements 21 arranged in an array.

[0029] The backlight module 200 is a direct-type backlight module, and the light source substrate 20 serves as a carrier substrate for the light-emitting element 21. The light-emitting element 21 can be LED (Light Emitting Diode), Micro-LED (Micro Light Emitting Diode Display), Mini-LED (Mini Light Emitting Diode), etc. For example, Mini-LED is conducive to achieving the characteristics of LCD (Liquid Crystal Display, LCD, liquid crystal display panel) such as lightness, high image quality, and low power consumption. The performance level is close to that of OLED (Organic Light Emitting Diode Display, OLED, organic light-emitting display panel), and is superior to OLED in terms of brightness and color rendering. In addition, Mini-LED backlight can be combined with fine local dimming technology to control the switch and brightness adjustment of the corresponding backlight area in real time, which can present high contrast, more vivid colors, and achieve a screen effect of high dynamic range (High Dynamic Range Imaging, HDR). A driving circuit electrically connected to the light emitting element 21 is disposed above, below or inside the light source substrate 20 for providing a light emitting driving signal to the light emitting element 21 . The type of the driving circuit is not limited in the embodiment of the present invention.

[0030] refer to Figure 1-Figure 2 , the reflective cup cover 30 is arranged on one side of the light source substrate 20 where the light emitting element 21 is arranged. The reflective cup cover 30 includes a plurality of reflective cups 31 connected to each other, the reflective cups 31 are provided with openings 32, and at least a portion of the connecting portion 31a between adjacent reflective cups 31 is provided with grooves 33. In the embodiment of the present invention, the opening 32 can be provided at the approximate center position of the reflective cup 31, and the reflective cup 31 can be a bowl-shaped structure. When the reflective cup cover 30 is fitted with the light source substrate 20, the light emitting element 21 is arranged in the opening 32. The reflective surface 31b of the reflective cup 31 faces the light emitting element 21, and the light emitted by the light emitting element 21 is reflected once or multiple times by the reflective surface 31b of the reflective cup 31 and then emitted in the direction of the diffusion film 40. The reflective cup 31 can block the light crosstalk between adjacent light emitting elements 21, thereby improving the light output brightness and light output contrast of the light emitting element 21.

[0031] The reflective cup cover 30 may be an integrally formed structure, and its shape may be a regular rectangle, or an irregular quadrilateral, an ellipse, etc. The shape of the reflective cup cover 30 may be reasonably set according to the light-emitting requirements of the backlight module 200, and the embodiment of the present invention does not impose any specific limitation.

[0032] It should be explained that the diffusion film 40 is arranged on the side of the reflective cup 30 away from the light source substrate 20, and can diffuse the light emitted by the light-emitting element 21 to improve the light uniformity of the backlight module 200. The embodiment of the present invention does not describe the diffusion film 40 in detail.

[0033] refer to Figure 1 and Figure 2 , at least part of the connecting portion 31a between adjacent reflective cups 31 is provided with a groove 33, which can reduce the weight of the reflective cup cover 30 compared to the design without a groove structure, which is conducive to the lightweight design of the backlight module, and also reduces the material usage of the reflective cup cover 30, thereby reducing the production cost of the reflective cup cover 30. The reflective cup cover 30 is fitted with the light source substrate 20, so that a closed cavity is formed between the groove 33 and the light source substrate 20. The closed space can make the reflective cup cover 30 more closely attached to the surface of the light source substrate 20, thereby avoiding the phenomenon of partial warping of the reflective cup 31, which leads to uneven light emission.

[0034] Among them, the local warping often exists in the edge warping and the central area warping of the reflector cup cover 30. Such a configuration is conducive to improving the problem of light crosstalk between adjacent light-emitting elements 21 caused by the warping of the reflector cup 31 in the central area of ​​the reflector cup cover 30 and the problem of edge light leakage caused by the warping of the reflector cup 31 in the edge area of ​​the reflector cup cover 30, thereby improving the structural stability of the display module 200 and the overall light uniformity.

[0035] Among them, after the reflective cup cover 30 is attached to the light source substrate 20, an AR experiment is usually performed to test the screen anti-reflection index of the display module 200. The screen anti-reflection index is a standard for measuring the screen reflection performance. It is usually expressed by the AR (AntiReflectance) value. The AR value is a measure of the proportion of light reflected by the screen. The lower the AR value, the less light is reflected by the screen, the better the anti-reflection performance, and the better the viewing experience. The tilting of the reflective cup 31 affects the AR value of the screen and affects the uniformity of the light emission of the display module 200.

[0036] Among them, the most common anti-reflection index is transmittance (TN value). TN value is an indicator to measure the light transmittance performance of the screen. The larger the TN value, the higher the transmittance and the better the screen display effect.

[0037] It should be noted that the backlight module 200 also includes a packaging shell, packaging glass, etc. ( Figure 1-2 The light source substrate 20, the reflector cup 30 and the diffusion film 40 are all located in the area defined by the packaging shell, and the packaging shell is used to package and protect the internal components. The packaging shell can be an integrally formed die-cast structure. Each structure works together to realize the backlight function of the backlight module, and the embodiment of the present invention will not be repeated.

[0038] Figure 3 for Figure 1 A schematic cross-sectional view of another backlight module along the AA' direction, see Figure 3 The backlight module 200 also includes a bonding adhesive 50, and the projection of the groove 33 on the light source substrate 20 is located in the bonding adhesive 50 area, and the reflective cup cover 30 is bonded to the light source substrate 20 through the bonding adhesive 50. In the embodiment of the present invention, the groove 33 is set in the bonding adhesive 50 area, and the edge of the groove 33 is sealed with the bonding adhesive 50, which can avoid air leakage at the edge of the bonding adhesive 50, thereby increasing the airtightness of the enclosed space. Furthermore, a bonding adhesive 50 with strong viscosity can also be used to make the reflective cup cover 30 adhere to the light source substrate 20 more firmly, so as to avoid the reflective cup cover 30 from partially tilting up.

[0039] Figure 4 A schematic diagram of a groove surface of a backlight module provided by an embodiment of the present invention, Figure 5 for Figure 4 An enlarged schematic diagram of the a region and the b region of a backlight module. The groove surface refers to the surface of the reflective cup cover 30 close to the light source substrate 20 where the groove is set. Figure 4 and Figure 5 The edge area of ​​the reflector cup cover 30 includes at least one air nozzle 34; the air nozzle 34 is a reserved opening for vacuuming. The groove 33 is located at the bottom of the reflector cup 31 and is a continuous mesh structure surrounding the opening 32. At least part of the groove 33 extends to the air nozzle 34.

[0040] Exemplarily, the shape of the reflector cup cover 30 is approximately a parallelogram, and the reflector cup cover 30 includes a plurality of reflector cups 31 arranged in an array, and grooves 33 are arranged at the bottom of the connecting portion 31a between adjacent reflector cups 31. A hole is drilled in the edge area of ​​the reflector cup cover 30 to obtain at least one air nozzle 34, and the air nozzle 34 is connected to at least part of the groove 33, such as Figure 4 and Figure 5 As shown in (a) and (b) in the figure. When the reflector cup cover 30 is attached to the light source substrate 20, the edges of the grooves 33 are attached to the light source substrate 20 and sealed. The grooves 33 that are crisscrossed horizontally and vertically are evacuated through the air nozzle 34, so that the closed cavity between the grooves 33 and the light source substrate 20 forms a negative pressure. Under the action of atmospheric pressure, the reflector cup cover 30 is firmly attached to the light source substrate 20, which can effectively prevent the reflector cup 31 from partially tilting during use. This structure can also reduce the weight of the reflector cover 30.

[0041] Figure 6 A schematic diagram of a groove surface of another backlight module provided by an embodiment of the present invention, Figure 7 for Figure 6 An enlarged schematic diagram of the c region of a backlight module, Figure 8 A schematic diagram of a groove surface of another backlight module provided by an embodiment of the present invention, Fig. 9 for Figure 8 An enlarged schematic diagram of the d area of ​​a backlight module.

[0042] refer to Figure 6-Figure 9 , the groove 33 is arranged on the side of the reflector cup cover 30 close to the light source substrate 20, and is an independent structure arranged in an array. In the embodiment of the present invention, the groove 33 is no longer a continuous mesh structure that is interlaced horizontally and vertically, but an independent structure arranged in an array. This arrangement structure can reduce the weight of the reflector cup cover 30 on the one hand, and at the same time, in some larger reflector cup covers 30, it can avoid the collapse of the reflector cup 31 caused by the excessively large area ratio of the groove 33 in the reflector cup cover 30, thereby ensuring the structural stability of the reflector cup 31.

[0043] The area ratio refers to the ratio of the groove area of ​​the groove 33 to the entire plane of the reflector cup 30 , which can also be understood as the area ratio of the enclosed cavity on the reflector cup 30 after the reflector cup 30 is bonded to the light source substrate 20 .

[0044] Based on the above embodiments, Figure 1-Figure 9 The duty ratio of the orthographic projection area of ​​the enclosed cavity on the reflector cup cover 30 is set to 15% to 30%. In the groove surface of the reflector cup cover 30 close to the light source substrate 20, the opening area of ​​the groove 33 is controlled to be within a reasonable range of the area ratio of the groove surface of the reflector cup cover 30, so as to avoid the collapse caused by the thinning of the bottom of the reflector cup 31, thereby ensuring the structural stability of the reflector cup cover 30.

[0045] Based on the above embodiments, Figure 1-Figure 9 In the thickness direction of the reflector cup cover 30 , the depth duty ratio of the enclosed cavity on the reflector cup cover 30 can be reasonably controlled to be 40% to 50%. On the basis of increasing the adhesion between the reflector cup cover 30 and the light source substrate 20 , the collapse caused by the thinning of the top of the reflector cup 31 can be avoided, thereby ensuring the structural stability of the reflector cup 31 .

[0046] Among them, reference Figure 2 The depth ratio of the closed cavity on the reflector cup cover 30 refers to the depth ratio of the groove 32 along the Figure 2 The ratio of the depth h1 in the Z direction to the depth h2 of the reflective cup 30 .

[0047] refer to Figure 6-Figure 7 The shape of the groove 33 is a truncated cone structure. In the embodiment of the present invention, the truncated cone structure can be arranged at the middle connecting portion 31a of the four adjacent openings 32. Figure 8-Figure 9The shape of the groove 33 is a quadrangular pyramid structure. In the embodiment of the present invention, the quadrangular pyramid structure can be set at the connection part 31a between two adjacent openings 32. The connection parts 31a around the openings 32 arranged in an array are relatively large in area and thick in depth, which is relatively easy to implement. At the same time, after the reflector cup cover 30 and the light source substrate 20 are attached to form a closed cavity, the force on the side wall of the groove 33 is relatively uniform, and the reflector cup 31 is not easy to collapse.

[0048] Based on the above embodiments, Figure 1-Figure 9 At the same time, the volume of the reflective cup cover 30 can be controlled to have a volume ratio of 8% to 15%. In this way, the weight of the reflective cup cover 30 can be controlled to avoid problems such as soft collapse and non-formability of the reflective cup cover 30, thereby ensuring the structural stability of the reflective cup cover 30.

[0049] For example, reference Figure 6 and Figure 7 The groove 33 adopts a truncated cone structure, the area ratio of the enclosed cavity on the reflective cup cover 30 is 15% to 30%, and the depth ratio is 40% to 50%. The overall weight of the reflective cup cover 30 can be reduced by 5% to 10%.

[0050] For example, reference Figure 8 and Fig. 9 The groove 33 adopts a quadrangular pyramid structure, the area ratio of the enclosed cavity on the reflective cup cover 30 is 15% to 30%, and the depth ratio is 40% to 50%. The overall weight of the reflective cup cover 30 can be reduced by 10% to 15%.

[0051] In the embodiment of the present invention, the volume of the quadrangular pyramid structure is greater than the volume of the truncated pyramid structure.

[0052] In other embodiments, the shape of the groove 33 may also be a regular hexagonal pyramid structure, etc., which may also achieve the effect of reducing weight, enclosing the cavity and increasing the adhesion between the reflector cup 31 and the light source substrate 20, which will not be shown one by one in the embodiments of the present invention.

[0053] On the basis of the above embodiment, whether it is the grooves 33 that are staggered horizontally and vertically, or the grooves 33 that are distributed in an independent array, after the reflector cup 30 and the light source substrate 20 are attached to form a closed cavity, the closed cavity and the external atmospheric pressure can also be controlled to satisfy the relationship: F 合 =△P*S.

[0054] Among them, F 合 is the sum of the external atmospheric pressures, ΔP is the difference between the external atmospheric pressure and the air pressure intensity in the closed cavity, and S is the surface area of ​​the closed cavity on the light source substrate 20 .

[0055] Specifically, refer to Figure 2, the reflective cup cover 30 and the light source substrate 20 after bonding can be placed in a vacuum box for degassing treatment, so that negative pressure is formed in the closed cavity. When the above pressure relationship is met, the closed cavity formed between the groove 33 and the light source substrate 20 acts like a suction cup, and under the action of the external atmospheric pressure, the reflective cup cover 30 is adsorbed on the surface of the light source substrate 20, thereby improving the bonding effect between the reflective cup cover 30 and the light source substrate 20.

[0056] Based on the same inventive concept, an embodiment of the present invention further provides a method for preparing a backlight module, which is used to prepare the above-mentioned backlight module. Fig.10 Schematic diagram of a method for preparing a backlight module provided by an embodiment of the present invention. Figure 1-Figure 10 , a method for preparing a backlight module provided by an embodiment of the present invention comprises:

[0057] S101, providing a light source substrate.

[0058] refer to Figure 1-Figure 3 The light source substrate 20 includes a plurality of light emitting elements 21 arranged in an array, and the light emitting type thereof will not be described in detail here.

[0059] S102, preparing a reflective cup cover by an integrated molding process, wherein the reflective cup cover comprises a plurality of reflective cups connected to each other, the reflective cups are provided with openings, and at least a portion of a connecting portion between adjacent reflective cups is provided with at least one groove.

[0060] refer to Figure 1-Figure 9 For example, a die-casting process or the like can be used to mix polycarbonate particles and titanium dioxide at a fixed mass fraction ratio, and after uniform mixing, they are molded into a film of a preset thickness, and then the film is vacuum-formed into a plurality of interconnected reflective cups 31, and a groove 33 is provided in at least a portion of the connecting portion 31a between adjacent reflective cups 31, and then an opening 32 is cut out in the center of the reflective cup 31 to obtain a semi-finished product, and then a micron-thick pure aluminum or pure silver film layer is vacuum-evaporated on the semi-finished product to form a reflective surface 31b of the reflective cup 31, and then a layer of silicone oil or other materials is coated on the pure aluminum or pure silver film layer for protection to obtain a finished reflective cup cover 30.

[0061] Among them, reference Figure 4-Figure 5 The grooves 33 may be a continuous mesh structure that intersects horizontally and vertically. Figure 6-Figure 9 The grooves 33 may also be independent structures arranged in an array. The material of the reflective cover 30 may also be a die-casting resin, metal or other material other than polycarbonate particles and titanium dioxide. The embodiment of the present invention does not limit the material of the reflective cup cover 30.

[0062] S103, bonding the reflective cup cover and the light source substrate so that the light emitting element is located in the opening.

[0063] refer to Figure 1-Figure 3 The prepared reflective cup cover 30 and the light source substrate 20 are aligned, at least one light-emitting element 21 on the light source substrate 20 is located in the opening of the reflective cup 31, and the opening 32 of the reflective cup 31 isolates the backlight module 200 into independent display partitions. In each display partition, the light emitted by the light-emitting element 21 is reflected once or multiple times by the reflective surface 31b of the reflective cup 31 and then emitted in the direction of the diffusion film 40.

[0064] In other embodiments, two or more light emitting elements 21 may be disposed in the opening 32 of the reflective cup 31 to meet different lighting requirements, which will not be shown one by one in the embodiments of the present invention.

[0065] S104: A closed cavity is formed between the groove and the light source substrate.

[0066] refer to Figure 2 and Figure 3 When the reflective cup cover 30 is fitted with the light source substrate 20, an extrusion force can be applied to the reflective cup cover 30 and the light source substrate 20 to press the groove 33 and the light source substrate 20, and squeeze out at least part of the air in the groove 33, so that a closed cavity is formed between the groove 33 and the light source substrate 20. The closed space can make the reflective cup cover 30 and the surface of the light source substrate 20 more closely attached, and avoid the local warping of the reflective cup 31 during use, which is conducive to improving the problem of light crosstalk between adjacent light-emitting elements 21 caused by the warping of the reflective cup 31 in the central area of ​​the reflective cup cover 30 and the problem of edge light leakage caused by the warping of the reflective cup 31 in the edge area of ​​the reflective cup cover 30, thereby improving the structural stability of the display module 200 and the overall light uniformity.

[0067] Based on the above embodiments, Figure 4 and Figure 5 When the criss-crossed grooves 33 are used, a vacuum exhaust method is used to reserve at least one air nozzle 34 in the edge area of ​​the reflector cup cover 30 . The grooves 33 are a continuous mesh structure surrounding the opening 32 of the reflector cup 31 .

[0068] In step 104, the reflective cup 31 and the light source substrate 20 are bonded together to form a closed cavity between the groove 33 and the light source substrate 20. The preparation method includes:

[0069] The air nozzle is used to perform vacuum treatment to generate negative pressure between the groove and the light source substrate to form a closed cavity.

[0070] Specifically, after the reflective cup cover 30 is aligned with the light source substrate 20, a vacuum treatment is performed through the air nozzle 34 to form a negative pressure in the closed cavity formed between the groove 33 and the light source substrate 20. Under the action of atmospheric pressure, the reflective cup 31 is firmly attached to the light source substrate 20 like a suction cup. In this way, the reflective cup 31 can be effectively prevented from partially warping up during the use of the display module 200.

[0071] Based on the above embodiments, Figure 3 , a highly viscous adhesive 50 can also be coated around the light emitting element 21 of the light source substrate 20, and after the reflector cup 30 is attached to the light source substrate 20, a vacuum treatment is performed using the air nozzle 34. On the one hand, the adhesive 50 can improve the adhesion between the reflector cup 30 and the light source substrate 20; on the other hand, during the vacuum treatment, the adhesive 50 can prevent air leakage between the groove 33 and the light source substrate 20.

[0072] Based on the above embodiments, Figure 6-Figure 9 When the grooves 33 are arranged in an array, in step 104, the reflector cup 31 and the light source substrate 20 are attached to form a closed cavity between the grooves 33 and the light source substrate 20. The preparation method includes:

[0073] The aligned reflector cup and the light source substrate are preheated to improve the internal stress. The preheated reflector cup and the light source substrate are placed in a vacuum box for degassing treatment to generate negative pressure between the groove and the light source substrate to form a closed cavity.

[0074] Among them, degassing treatment refers to removing bubbles from the product by using air pressure difference.

[0075] Specifically, in the embodiment of the present invention, a highly viscous adhesive 50 can be coated around the light emitting element 21 of the light source substrate 20, and after the reflector cup 30 is pasted on the light source substrate 20, the reflector cup 31 and the light source substrate 20 are assembled and pressurized, and a heating treatment is performed to improve the internal stress, increase the adhesion between the reflector cup 30 and the light source substrate 20, and form a closed space. Then, it is placed in a vacuum box for degassing treatment to remove the gas in the closed cavity, and the closed cavity and the external atmospheric pressure satisfy the relationship: F 合 =△P*S. The closed cavity firmly adsorbs the reflective cup 31 on the light source substrate 20 like a suction cup, thereby improving the problem of partial warping of the reflective cup 31.

[0076] It should be noted that in the embodiment of the present application, the use of bonding adhesive or negative pressure adsorption between the reflector cup and the light source substrate increases the bonding force between the two. The weight reduction caused by the groove in the reflector cup has a negligible effect on the bonding effect between the reflector cup and the light source substrate.

[0077] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Fig.11 A schematic diagram of a display device according to an embodiment of the present invention is provided. Fig.11 The display device 300 includes the backlight module 200 and the display panel 400 provided in the above embodiment. Therefore, the display device also has the beneficial effects of the backlight module in the above embodiment. The similarities can be understood by referring to the above explanation of the backlight module, which will not be described in detail below. The backlight module 200 provides a light source for the display panel 400, and the display panel 400 includes a liquid crystal display panel. The structure of the display panel 40 is not described in detail in the embodiment of the present invention.

[0078] The display device 300 provided in the embodiment of the present invention can be Fig.11 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0079] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A backlight module, characterized in that: include: A light source substrate, comprising a plurality of light emitting elements arranged in an array; A reflector cup cover, comprising a plurality of reflector cups connected to each other, wherein the reflector cups are provided with openings, and at least a portion of a connecting portion between adjacent reflector cups is provided with at least one groove; The reflective cup is fitted with the light source substrate, at least one of the light emitting elements is located in the opening, and the reflective surface of the reflective cup faces the light emitting element; a closed cavity is formed between the groove and the light source substrate.

2. The backlight module according to claim 1, characterized in that: It also includes bonding glue, the projection of the groove on the light source substrate is located in the bonding glue area, and the reflective cup cover and the light source substrate are bonded by the bonding glue.

3. The backlight module according to claim 1, characterized in that: The edge area of ​​the reflective cup cover includes at least one air nozzle opening; the air nozzle opening is a reserved opening for vacuuming; The groove is located on a side of the reflector cup cover close to the light source substrate, and the groove forms a continuous mesh structure around the opening, and at least a portion of the groove extends to the air nozzle opening.

4. The backlight module according to claim 1, characterized in that: The groove is located on a side of the reflector cup cover close to the light source substrate, and the groove is an independent structure arranged in an array.

5. The backlight module according to claim 1, characterized in that: The groove is in the shape of a quadrangular pyramid structure or a truncated pyramid structure.

6. The backlight module according to claim 1, characterized in that: The closed cavity and the external atmospheric pressure satisfy the relationship: F 合 =△P*S; Wherein, S is the surface area of ​​the enclosed cavity on the light source substrate, ΔP is the difference between the external atmospheric pressure and the gas pressure in the enclosed cavity, and F 合 is the sum of the external atmospheric pressure.

7. The backlight module according to claim 1, characterized in that: The duty ratio of the orthographic projection area of ​​the enclosed cavity on the reflective cup cover is 15% to 30%.

8. The backlight module according to claim 1, characterized in that: The depth ratio of the enclosed cavity on the reflective cup cover is 40% to 50%.

9. The backlight module according to claim 1, characterized in that: The volume ratio of the enclosed cavity on the reflective cup cover is 8% to 15%.

10. The backlight module according to claim 1, characterized in that: The reflective cup cover is an integrally formed structure.

11. A method for preparing a backlight module, used for preparing the backlight module according to any one of claims 1 to 10, characterized in that: The preparation method comprises: Providing a light source substrate, the light source substrate comprising a plurality of light emitting elements arranged in an array; The reflector cup cover is manufactured by an integrated molding process, wherein the reflector cup cover comprises a plurality of reflector cups connected to each other, the reflector cups are provided with openings, and at least a portion of the connecting portion between adjacent reflector cups is provided with at least one groove; Fitting the reflective cup cover to the light source substrate so that the light emitting element is located in the opening; A closed cavity is formed between the groove and the light source substrate.

12. The preparation method according to claim 11, characterized in that: The edge area of ​​the reflective cup cover includes at least one air nozzle opening; the groove is a continuous mesh structure surrounding the opening; The reflector cup is attached to the light source substrate, and a closed cavity is formed between the groove and the light source substrate, including: The air nozzle is subjected to vacuum treatment to generate negative pressure between the groove and the light source substrate, thereby forming a closed cavity.

13. The preparation method according to claim 11, characterized in that: The groove is an independent structure arranged in an array; the reflector cup is attached to the light source substrate, and a closed cavity is formed between the groove and the light source substrate, including: Performing a heating pretreatment on the aligned reflector cup and the light source substrate; The reflective cup cover and the light source substrate after the heating pretreatment are placed in a vacuum box for degassing treatment, so that negative pressure is generated between the groove and the light source substrate, thereby forming a closed cavity.

14. A display device, characterized in that: A display module comprising any one of claims 1 to 13.

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