Backlight module and display device

Abstract

The utility model relates to the technical field of backlight display, in particular to a backlight module and a display device.The backlight module comprises a substrate, at least two light source bodies and at least two reflection cups, the light source bodies are arranged on the substrate, convex lens-shaped structures are arranged on the light-emitting faces of the light source bodies, the reflection cups are connected with the substrate, the reflection cups are connected with one another, and the reflection cups are arranged on the substrate. A containing groove is formed in each reflection cup, each light source body is arranged in the corresponding containing groove, the width of each containing groove is gradually reduced from the end away from the base plate to the end close to the base plate, and the end, away from the base plate, of each containing groove is higher than the end, away from the base plate, of the corresponding containing groove. By means of the arrangement that the width of the containing groove is gradually reduced from the end away from the substrate to the end close to the substrate, large-angle light rays emitted by the light source body can be effectively reflected and gathered, the situation that the light rays are diffused to adjacent dark areas is reduced, and the halo phenomenon is relieved.

Description

Technical Field

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

[0002] One of the main functions of the backlight module is to supply sufficient and evenly distributed light to the LCD panel. The backlight module usually divides the backlight into different areas (i.e. backlight partitions) and lights up the backlight in specific areas according to the picture requirements. In the LCD display, only the illuminated pixel area will display the image, while the adjacent dark area remains dark.

[0003] Due to the luminous characteristics of LED (light-emitting diode) lamp beads, light will diffuse and overflow during the propagation process, especially in the case of large viewing angles, the light is more likely to diffuse from the backlight partition to the adjacent dark area. When the backlight diffuses from the partition to these dark areas, since the brightness of the dark area is much lower than that of the lit area, the diffused light forms an obvious brightness difference at the edge of the dark area, thus forming a halo.

[0004] The generation of halo reduces the contrast of the image, resulting in less image details and layering, affecting the viewing experience. Utility Model Content

[0005] The present disclosure provides a backlight module and a display device to solve the problem in the above-mentioned background technology that the details and layering of an image are reduced due to halo, thereby affecting the viewing experience.

[0006] In a first aspect, the present disclosure provides a backlight module, comprising:

[0007] A substrate, at least two light sources and at least two reflective cups, each of which is arranged on the substrate, the light source body includes a light source chip and a transparent packaging layer, the transparent packaging layer is coated on the outer side of the light source chip, the light source chip has a light emitting surface, a side of the transparent packaging layer facing away from the light source chip gradually bulges from the edge to the middle toward an end away from the transparent packaging layer to form an arc surface, each of the reflective cups is connected to the substrate, and each of the reflective cups is connected to each other, a receiving groove is arranged in each of the reflective cups, each of the light sources is arranged in one of the receiving grooves, the width of the receiving groove gradually decreases from an end away from the substrate to an end close to the substrate, and the distance between the end of the receiving groove away from the substrate and the substrate is greater than the distance between a side of the light source body away from the substrate and the substrate.

[0008] In one embodiment, a cup opening is formed at one end of the reflective cup close to the substrate, the cup opening is communicated with the accommodating groove, the light source body is disposed in the cup opening, and the light source body is spaced apart from the side wall of the cup opening.

[0009] In one embodiment, the side wall of the receiving groove is configured as any one of the following:

[0010] The side wall of the containing groove is bent from one end close to the substrate to one end far from the substrate toward a side close to the substrate, and

[0011] The side wall of the containing groove is bent from one end close to the substrate to one end far away from the substrate and toward a side far away from the substrate, and

[0012] The side wall of the containing groove is inclined from an end close to the substrate to an end far away from the substrate.

[0013] In one embodiment, the reflective cups are integrally connected, and the material of the reflective cups is any one of polyethylene terephthalate, polycarbonate and polystyrene.

[0014] In one embodiment, each of the reflective cups is connected to the substrate via an adhesive layer.

[0015] In one embodiment, the edges of adjacent reflective cups are connected in sequence, a fixing hole is provided at a connecting portion between at least two adjacent reflective cups, and at least one supporting column is provided on the substrate, and the supporting column passes through the fixing hole.

[0016] In one embodiment, the width of the support column gradually decreases from an end close to the substrate to an end far away from the substrate.

[0017] In one embodiment, a diffusion plate is further included. The diffusion plate is disposed on a side of the reflective cup away from an end of the substrate, and the diffusion plate is spaced apart from the reflective cup.

[0018] In one embodiment, the depth of the reflective cup is greater than half of the distance between the diffuser plate and the substrate.

[0019] In one embodiment, one end of the support column away from the substrate abuts against the diffusion plate.

[0020] In a second aspect, the present disclosure provides a display device, comprising the backlight module described in any one of the above items.

[0021] The present disclosure provides a backlight module and a display device, in which the width of the accommodating groove is gradually reduced from one end far from the substrate to the end close to the substrate, so that the large-angle light emitted by the light source can be effectively reflected and concentrated, thereby reducing the diffusion of light to adjacent dark areas and alleviating the halo phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0023] Figure 1 A schematic diagram of the structure of a backlight module provided in an embodiment of the present disclosure;

[0024] Figure 2 A schematic diagram of the structure of a light source provided by an embodiment of the present disclosure;

[0025] Figure 3 A schematic diagram of the connection relationship between a support column and a reflective cup provided in an embodiment of the present disclosure;

[0026] Figure 4 A schematic diagram of the structure of a light control film provided in an embodiment of the present disclosure;

[0027] Figure 5 A comparison diagram of the relationship between the depth of a reflective cup and the light mixing effect provided in an embodiment of the present disclosure;

[0028] Figure 6 A schematic diagram of the distribution structure of a support column provided in an embodiment of the present disclosure;

[0029] Figure 7 A schematic diagram comparing the light mixing effects of a display device provided in an embodiment of the present disclosure and a common display device.

[0030] Explanation of reference numerals: 100, substrate; 200, light source body; 210, light source chip; 220, transparent encapsulation layer; 300, reflective cup; 310, receiving groove; 320, cup mouth; 400, adhesive layer; 500, supporting column; 600, diffusion plate. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, and to fully understand and implement how the present disclosure applies technical means to solve technical problems and achieve the corresponding technical effects, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only embodiments of a part of the present disclosure, not all of the embodiments. The embodiments of the present disclosure and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present disclosure.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In one embodiment, if Figure 1 and Figure 2 As shown, a backlight module provided by an embodiment of the present disclosure includes: a substrate 100, at least two light source bodies 200 and at least two reflective cups 300, each of the light source bodies 200 is arranged on the substrate 100, the light source body 200 includes a light source chip 210 and a transparent encapsulation layer 220, the transparent encapsulation layer 220 is coated on the outer side of the light source chip 210, the light source chip 210 has a light emitting surface, and the side of the transparent encapsulation layer 220 facing away from the light source chip 210 is gradually convex from the edge to the middle toward the end away from the transparent encapsulation layer 220 The reflective cups 300 are connected to the substrate 100, and are connected to each other. A receiving groove 310 is provided in each reflective cup 300. Each light source body 200 is provided in one of the receiving grooves 310. The width of the receiving groove 310 gradually decreases from an end away from the substrate 100 to an end close to the substrate 100. The distance between the end of the receiving groove 310 away from the substrate 100 and the substrate 100 is greater than the distance between a side of the light source body 200 away from the substrate 100 and the substrate 100.

[0034] In this embodiment, the substrate may also be referred to as a lamp board, which is used to carry the light source body 200, and a power supply circuit is arranged on the substrate, and the power supply circuit is connected to the light source body 200 to realize power supply to the light source body. The light source body 200 may be an LED lamp bead, which may be inserted and arranged on the substrate 100, or may be mounted on the substrate 100 in a patch manner. The lens encapsulation layer 220 is raised along the light emitting direction of the light emitting surface to form an arc surface, which plays a role in diffusing the light and further expands the original light emitting angle. Ordinary LEDs are approximately Lambertian bodies, and usually have a light emitting angle of 120°. Through the arc surface on the lens encapsulation layer 220, the light emission angle can be further expanded. For example, when the distance between the light emitting surface of the light source body 200 and the substrate 100 is 0.7 mm, when the distance between the top of the arc surface and the light emitting surface of the light source body 200 is set to about 0.6 mm, the light emitting angle of the light source body can be expanded to 160° to 170°. The raised height of the arc surface matches the actual needs, and is not specifically limited here.

[0035] In one embodiment, the convex arc structure can be formed by dispensing glue on the light emitting surface of the transparent encapsulation layer 220 of the light source chip 210. The lens-shaped structure formed after dispensing glue can diffuse and adjust the light source body 200, and can also better dissipate heat and protect the light source body 200.

[0036] By increasing the light emission angle, the power or number of light sources can be reduced while maintaining the lighting effect, thereby achieving energy saving. After the convex arc-shaped structure cooperates with the reflective cup 300, the modulation of the reflective cup 300 can prevent the diffused light from excessively diffusing to the adjacent dark area, thereby achieving the target light emission effect with fewer light sources 200 and generating a smaller light spot area.

[0037] The reflective cup 300 is provided with a receiving groove 310, and each light source body 200 is disposed in a receiving groove 310. The sidewall edge of each receiving groove 310 is connected to the substrate 100, and the distance between the end of the receiving groove 310 away from the substrate 100 and the substrate 100 is greater than the distance between the side of the light source body 200 away from the substrate 100 and the substrate 100, so that the end of the receiving groove 310 away from the substrate 100 is higher than the light emitting surface of the light source body 200. The reflective cup 300 is provided with a light outlet at one end of the receiving groove 310 away from the substrate 100, and the light outlet is connected to the receiving groove 310. As the depth of the receiving groove 310 increases, the width of the receiving groove 310 decreases, that is, the closer to the substrate 100, the smaller the width of the receiving groove 310, or in other words, the farther the receiving groove 310 is from the substrate 100, the larger the width. Since the light source body 200 is arranged at a position close to the bottom of the receiving groove 310, the light emitted by the light source body 200 can be more fully modulated. The shape of the light outlet can be circular or square, depending on the actual light output requirements, and is not specifically limited here. The side walls of the light outlets of each reflective cup 300 are connected to each other, so that the structure of the reflective cup 300 is more stable, thereby improving the uniformity of light collection and making the picture display effect better.

[0038] When the light propagates in a straight line, it will hit the side wall of the accommodating groove 310 and reflect. Since the width of the accommodating groove 310 gradually increases from the end close to the substrate 100 to the end far from the substrate 100, the light near the edge of the luminous angle will be closer to the central light after reflection and emitted from the light outlet, thereby achieving the effect of focusing, reducing the diffusion and overflow of the light during the propagation process, and thus improving the phenomenon of halo formation when the light diffuses from the backlight partition to the adjacent dark area.

[0039] In summary, the backlight module of this embodiment can reduce the power or number of light sources while maintaining the lighting effect by increasing the light emission angle, thereby achieving energy saving. After the convex arc-shaped structure cooperates with the reflective cup 300, the modulation of the reflective cup 300 can prevent the diffused light from excessively diffusing to the adjacent dark area, thereby achieving the target light emission effect with fewer light sources 200 and generating a smaller halo area.

[0040] In one embodiment, if Figure 1 As shown, the reflective cup 300 has a cup opening 320 at one end close to the substrate 100 , the cup opening 320 is connected to the receiving groove 310 , the light source body 200 is disposed in the cup opening 320 , and the light source body 200 is spaced apart from the side wall of the cup opening 320 .

[0041] In this embodiment, the reflective cup 300 has a mounting surface at one end away from the light outlet, and a cup mouth 320 is provided on the mounting surface. The cup mouth 320 is connected to the receiving groove 310, and the side wall (or mounting surface) of the cup mouth 320 is connected to the substrate 100. The cup mouth 320 can be arranged in a circular or square shape, and the light source body 200 is arranged at the center of the cup mouth 320 so that the light is more evenly diffused to the surroundings. The light source body 200 and the side wall of the cup mouth 320 are arranged at intervals, which can reduce the occurrence of collision between the reflective cup 300 and the light source body 200 during the process of being installed on the substrate 100, and effectively avoid damage to the light source body 200. For example, a distance of 1.5 to 2.5 mm can be reserved on one side between the light source body 200 and the side wall of the cup mouth 320, that is, the width of the cup mouth 320 can be 3 to 5 mm greater than the width of the light source body 200.

[0042] In one embodiment, the side wall of the receiving groove is configured as any one of the following:

[0043] The side wall of the containing groove is bent from one end close to the substrate to one end far from the substrate toward a side close to the substrate, and

[0044] The side wall of the containing groove is bent from one end close to the substrate to one end far away from the substrate and toward a side far away from the substrate, and

[0045] The side wall of the containing groove is inclined from an end close to the substrate to an end far away from the substrate.

[0046] In this embodiment, the side wall of the containing groove can be a plane or a curved surface. In one embodiment, the side wall of the containing groove is bent from one end close to the substrate to one end away from the substrate toward the side close to the substrate, that is, it is bent outward, so that after the light hits the side wall of the containing groove, it is reflected and gathered toward the center of the light, and the side wall at the end away from the substrate (or the side wall of the cup mouth) is extended to the side away from the containing groove, so that the light can have a wider irradiation angle after being modulated.

[0047] In one embodiment, the side wall of the receiving groove is bent from one end close to the substrate to the end far away from the substrate, that is, it is bent inward, so that after the light hits the side wall of the receiving groove, it is reflected and gathered toward the center of the light, thereby achieving the effect of reducing halo.

[0048] In one embodiment, the sidewall of the receiving groove is a plane and is inclined from one end close to the substrate to one end away from the substrate, in a prism shape. When light hits the sidewall of the receiving groove, it is reflected and also gathered toward the center of the light, thereby reducing the light from diffusing to the adjacent dark area.

[0049] In practical applications, the side wall profile of the receiving groove can be generated as a straight line or Bezier curve through the automatic optimization tool in the optical simulation software, and simulated and optimized to achieve a better reflection effect. During the simulation, the parameters of the side wall profile can be adjusted. For example, when the side wall profile is a slope, the light output effect can be observed by adjusting the inclination angle of the slope. When observing the light output effect, whether the mixed light effect is good can be determined by observing whether the uniformity of the light output of multiple light sources is good. The uniformity of light output refers to the uniformity of the spatial distribution of the light emitted by the light source. If the uniformity of the light is good, it means that the distribution of the light in the irradiated area is uniform and there is no obvious light spot. When the light sources are distributed in an array on the substrate, the light is emitted from the light outlet of the reflective cup to form a circular or square illumination area. When the light output uniformity of each light source is good, there is no obvious light and dark boundary between the illumination areas. On the contrary, there will be obvious light and dark boundaries, making the illumination area of ​​each light source appear "grid" as a whole.

[0050] By optimizing the side wall surface parameters, it is possible to further reduce the number of light sources used, reduce the spot area of ​​the light source partitions, improve the side viewing angle contrast, and reduce the halo phenomenon while maintaining uniform light mixing.

[0051] In this embodiment, in one embodiment, the reflective cups 300 are integrally connected, and the material of the reflective cups 300 is any one of polyethylene terephthalate, polycarbonate and polystyrene.

[0052] In this embodiment, a light control film is provided, and the light control film includes reflective cups 300 connected to each other. The light control film is formed in one piece, so that the connection between the reflective cups 300 is more stable, and the stability of the picture display is further improved.

[0053] The material of the light control film can be colorless and transparent materials such as PET (polyethylene terephthalate), PC (polycarbonate) or PS (polystyrene). To further improve the display effect, choose PET, PC or PS materials with a reflectivity of more than 95% to increase the brightness of the backlight partition.

[0054] In one embodiment, if Figure 3 As shown, each of the reflective cups 300 is connected to the substrate 100 via an adhesive layer 400 .

[0055] In this embodiment, an adhesive layer 400 is provided on the substrate 100, and the mounting surface of the reflective cup 300 is adhered to the adhesive layer 400. The reflective cup 300 is fixed by adhesion, so that the installation and removal of the reflective cup 300 are more convenient. The adhesive layer 400 can be a double-sided adhesive layer or an edge adhesive layer, which is selected according to the actual application scenario and is not specifically limited here.

[0056] In one embodiment, the adhesive layer 400 is spaced apart from the light source body 200 to reduce the possibility that the adhesive layer 400 may contaminate the light source body 200 during installation, thereby reducing the impact on the image display effect.

[0057] In one embodiment, if Figure 3 As shown, the edges of adjacent reflective cups 300 are connected in sequence, at least one support column 500 is protruded from the substrate 100, a fixing hole is opened between at least two adjacent reflective cups 300, and each support column 500 is passed through one of the fixing holes.

[0058] In this embodiment, the support column 500 passes through the fixing hole to further fix the mutually connected reflective cups 300, so that the connection between the reflective cups 300 is more stable. In order to further enhance the supporting effect, the number of support columns 500 can be increased. The support column 500 can be fixed on the substrate 100 by the adhesive layer 400, which is convenient for installation and removal.

[0059] In one embodiment, the width of the support column 500 gradually decreases from an end close to the substrate 100 to an end far away from the substrate 100 .

[0060] In this embodiment, the width of the support column 500 gradually decreases from the end close to the substrate 100 to the end far from the substrate 100, and is arranged in a cone shape, so that the support column 500 is more convenient to pass through the fixing hole. At the same time, the reduced width of the support column can avoid large-area light blocking, making the light more uniform.

[0061] In one embodiment, if Figure 3 As shown, a diffusion plate 600 is further included. The diffusion plate 600 is connected to the substrate 100 , and the diffusion plate 600 is disposed on one side of the reflective cup 300 away from one end of the substrate 100 , and the diffusion plate 600 and the reflective cup 300 are spaced apart.

[0062] In this embodiment, the light emitted by the light source body 200 is modulated by the reflective cup 300, emitted from the light outlet, and then diffused to every corner of the liquid crystal panel evenly after passing through the diffuser plate 600, thereby improving the overall backlight brightness. The diffuser plate 600 and the reflective cup 300 are arranged at intervals, so that the diffusion range of the light is larger, and the number of light sources 200 required is reduced, which is more energy-efficient.

[0063] In one embodiment, the depth of the reflective cup 300 is greater than half of the distance between the diffuser plate 600 and the substrate 100 .

[0064] In this embodiment, the distance between the diffuser plate 600 and the substrate 100 is the light mixing height. When the depth of the reflective cup 300 is greater than half of the light mixing height, a better light mixing effect can be achieved and the light distribution can be more uniform.

[0065] In one embodiment, one end of the support column 500 away from the substrate 100 abuts against the diffusion plate 600 .

[0066] In this embodiment, the end of the support column 500 away from the substrate 100 abuts against the diffuser plate 600, which plays a role in supporting the diffuser plate 600. In a high temperature environment, the material of the diffuser plate 600 may undergo thermal expansion, causing the middle area to be concave, or under the action of gravity, if the support structure of the diffuser plate 600 is uneven, the middle area may also be deformed due to greater pressure. By supporting the diffuser plate 600 with the support column 500, the overall shape and stability of the diffuser plate 600 can be better maintained, so that the picture display effect is better.

[0067] In one embodiment, the width of the support column 500 gradually decreases from an end close to the substrate 100 to an end away from the substrate 100 , and the end of the support column 500 away from the substrate 100 abuts against the diffusion plate 600 .

[0068] In this embodiment, the smaller the area of ​​the end of the support column 500 away from the substrate 100 abutting against the diffuser 600, the more uniform the light emitted through the diffuser 600 can be, and the smaller the "black spot" formed in the light-emitting area, thereby making the picture display effect clearer.

[0069] Furthermore, in order to better maintain the structure of the diffuser plate 600 and make the light mixing height more stable, the number of support columns 500 can be determined according to the deformation coefficient of the selected diffuser plate 600, and is not specifically limited here.

[0070] In one embodiment, based on the above embodiment, Figure 3 As shown, this embodiment provides an application example.

[0071] The backlight module in this embodiment includes a substrate 100, a light source body 200, a colloid, a light control film, a support column 500 and a diffusion plate 600. Among them, the light source body 200 is evenly installed on the substrate 100, and the light source body 200 adopts Mini LED packaging as a 2835 transparent bracket packaging, and at the same time, glue is applied on the top of the bracket to form a lens structure. The lens structure can increase the original light-emitting angle of the LED from 120° to about 160° to 170°. Specifically, the height between the top of the packaged LED and the substrate 100 is 0.7mm, the refractive index of the glue is between 1.4 and 1.5, and the height of the glue-applied part is 0.4mm.

[0072] like Figure 4 The light-controlling film shown in the figure is integrally formed with mutually connected reflective cups 300, and the reflective cups 300 are arranged in the shape of a regular quadrangular pyramid. A regular quadrangular pyramid-shaped receiving groove 310 is arranged inside the reflective cup 300, and a mounting surface is provided at the end with a smaller width of the regular reflective cup 300, and a square cup mouth 320 is provided on the mounting surface; a square light outlet is provided at the end with a larger width of the reflective cup 300, and the cup mouth 320 and the light outlet are both connected to the receiving groove 310. The reflective cup 300 can be formed by vacuum forming or injection molding, and the material reflectivity is greater than 95%, and the material thickness is between 0.3mm and 0.6mm. The process data of the reflective cup 300 is set as follows:

[0073] Cup mouth 320: The width of the cup mouth 320 is greater than the LED package size + 4mm. In this embodiment, considering the assembly tolerance of the light source body 200 and the light control film, a distance of 1.5 to 2.5mm is reserved on one side between the light source body 200 and the side wall of the cup mouth 320. In this embodiment, 2mm is reserved on one side, so the width of the cup mouth 320 is 4mm greater than the LED package size.

[0074] Light outlet: The width of the light outlet is LED pitch-0.6mm. Theoretically, the smaller the connection distance between the reflective cups 300, the better the light mixing effect. However, due to the limitation of the light control film process, the connection distance between the reflective cups 300 must be at least 0.6mm to ensure the connection strength. Therefore, the width of the light outlet is set to LED pitch-0.6mm.

[0075] The substrate 100 is provided with double-sided adhesive tape, which is spaced apart from the light source body 200. The support column 500 is evenly pasted and fixed on the double-sided adhesive tape, and the support column 500 is arranged in a cone shape. Each light source body 200 is arranged at the center of the cup mouth 320 of a reflective cup 300, and the side wall edge of the cup mouth 320 is fixed to the substrate 100 by double-sided adhesive tape. A fixing hole is provided between two adjacent reflective cups 300 of the light control film. When installing the light control film, align the fixing hole with the support column 500 and press it toward the substrate 100, and make the installation surface close to the double-sided adhesive tape to fix the light control film on the substrate 100. The diffuser plate 600 is connected to the fixing plate and covers the support column 500.

[0076] In order to make the mixing light effect of the backlight module better, the automatic optimization tool in the optical simulation software is used to simulate the mixing light effect. During the simulation, three models of reflective cups are set. In the first model, the cup wall of the reflective cup 300 is set to bend outward, that is, the side wall of the accommodating groove 310 is set to bend from the end close to the substrate 100 to the end away from the substrate 100 to the side close to the substrate 100; in the second model, the cup wall of the reflective cup 300 is set to bend inward, that is, the side wall of the accommodating groove 310 of the reflective cup is set to bend from the end close to the substrate 100 to the end away from the substrate 100 to the side away from the substrate 100; in the third model, the cup wall of the reflective cup 300 is a plane, that is, the side wall of the accommodating groove 310 is set to be inclined from the end close to the substrate 100 to the end away from the substrate 100.

[0077] Afterwards, the parameters of the three models are adjusted according to the control variable method. Specifically, the initial model is set: the initial outer curvature of the cup wall of the first model is θ1, and the cup depth value is H1; the initial inner curvature of the cup wall of the second model is θ2, and the cup depth value is H1; the inclination angle of the cup wall of the third model is θ3, the cup depth value is H1, and the mixed light height is H2. Afterwards, H1 is adjusted to compare the changes in the corresponding light output effects of the three models as the cup depth value changes. After the light is emitted from the light-control film, a square illumination area will be formed as a whole. When the cup depth value changes, the corresponding square illumination area will also change. The best lighting effect is determined by observing the changes in the square illumination area. The better the lighting effect, the more uniform the brightness of the corresponding illumination area, and there is no obvious boundary between light and dark.

[0078] After simulating the influence of cup depth on the light mixing effect, the optimal cup depth value can be determined. Then, based on the optimal cup depth value, the outer curvature, inner curvature and inclination of the cup wall in different models can be adjusted. According to the same light mixing effect judgment method, the optimal outer curvature, inner curvature and inclination can be further determined.

[0079] like Figure 5As shown, when the light mixing height (the distance between the substrate 100 and the diffuser 600) OD is 13mm, the design depth H of the reflector 300 is 7mm, and the best light mixing effect can be obtained. At this time, the central brightness of the square illumination area is the highest and the uniformity is the best. Under other depth conditions, the illumination area presents different degrees of grid-like light and dark boundaries, indicating that the uniformity of the brightness of the illumination area is not good enough and the light mixing effect is not ideal; when OD is 14mm, the optimal depth is 7.5mm; when OD is 15mm, the optimal depth is 8mm; when OD is 16mm, the optimal depth is 8.5mm. At the same time, by comparing the illumination areas of the reflector cups of the three models, it can be found that at the same optimal depth, the illumination areas presented by different reflector cups 300 have no obvious difference, which means that the depth of the reflector cup 300 has the greatest impact on the light mixing effect, and the side wall curvature or inclination has a relatively small impact on the light mixing effect.

[0080] By fitting the relationship between the light mixing height and the depth data of the reflective cup 300, it is obtained that when the light mixing effect is optimal, the relationship between the depth H and OD is: H=(OD+1) / 2.

[0081] To ensure the stability of the picture, the OD fluctuation must be less than 0.5mm, that is, the deformation of the diffuser plate 600 ΔH<0.5mm. The deformation of the diffuser plate 600 is related to the distance L of the support column 500, ΔH=L*α<0.5mm (α is the deformation coefficient of the material, and the deformation coefficient of the glass diffuser plate is approximately 0.002), so L<0.5 / α=250mm.

[0082] like Figure 6 As shown, based on the above data, the 55-inch backlight uses 24 support columns 500 to pass through the light-controlling film to support DP. The support columns 500 are evenly distributed in a triangle, and the maximum distance between adjacent support columns 500 is 203 mm.

[0083] When the backlight module of this embodiment is applied to a display device, with the same 55-inch structure and the same light mixing height, using a conventional Mini LED solution, 960 partitions require 5760 LEDs to mix light evenly. However, by adopting the solution of this proposal, the number of LEDs can be reduced to 1920, greatly reducing costs. In addition, the area of ​​the light spot displayed on the screen is reduced, and the halo effect is significantly improved.

[0084] like Figure 7 The figure shows a comparison of the halo effect between a display device using the backlight module of this embodiment and a conventional display device. The left figure shows the conventional display device, and the right figure shows the display device using the backlight module of this embodiment. It can be seen that the halo area in the right figure is greatly reduced.

[0085] It should be noted that in the present disclosure, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element limited by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0086] Although the embodiments disclosed in the present disclosure are as above, the above contents are only embodiments adopted for facilitating the understanding of the present disclosure and are not intended to limit the present disclosure. Any technician in the technical field to which the present disclosure belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure, but the scope of patent protection of the present disclosure shall still be subject to the scope defined in the attached claims.

Claims

1. A backlight module, characterized in that: include: A substrate, at least two light sources and at least two reflective cups, each of which is arranged on the substrate, the light source body includes a light source chip and a transparent packaging layer, the transparent packaging layer is coated on the outer side of the light source chip, the light source chip has a light emitting surface, a side of the transparent packaging layer facing away from the light source chip gradually bulges from the edge to the middle toward an end away from the transparent packaging layer to form an arc surface, each of the reflective cups is connected to the substrate, and each of the reflective cups is connected to each other, a receiving groove is arranged in each of the reflective cups, each of the light sources is arranged in one of the receiving grooves, the width of the receiving groove gradually decreases from an end away from the substrate to an end close to the substrate, and the distance between the end of the receiving groove away from the substrate and the substrate is greater than the distance between a side of the light source body away from the substrate and the substrate.

2. The backlight module according to claim 1, characterized in that: The reflective cup is provided with a cup opening at one end close to the base plate, the cup opening is communicated with the containing groove, the light source body is arranged in the cup opening, and the light source body is spaced apart from the side wall of the cup opening.

3. The backlight module according to claim 1, characterized in that: The side wall of the receiving groove is configured as any of the following: The side wall of the containing groove is bent from one end close to the substrate to one end far from the substrate toward a side close to the substrate, and The side wall of the containing groove is bent from one end close to the substrate to one end far away from the substrate and toward a side far away from the substrate, and The side wall of the containing groove is inclined from an end close to the substrate to an end far away from the substrate.

4. The backlight module according to claim 1, characterized in that: The reflective cups are connected in one piece, and the material of the reflective cups is any one of polyethylene terephthalate, polycarbonate and polystyrene.

5. The backlight module according to claim 1, characterized in that: Each of the reflective cups is connected to the substrate via an adhesive layer.

6. The backlight module according to claim 1, characterized in that: The edges of the adjacent reflective cups are connected in sequence, a fixing hole is provided at the connecting portion between at least two adjacent reflective cups, and at least one supporting column is provided on the base plate, and the supporting column passes through the fixing hole.

7. The backlight module according to claim 6, characterized in that: The width of the support column gradually decreases from an end close to the substrate to an end far away from the substrate.

8. The backlight module according to claim 6, characterized in that: The invention also comprises a diffusion plate, which is arranged on one side of the reflective cup away from one end of the substrate, and the diffusion plate and the reflective cup are spaced apart.

9. The backlight module according to claim 8, characterized in that: The depth of the reflective cup is greater than half of the distance between the diffusion plate and the substrate.

10. The backlight module according to claim 8, characterized in that: One end of the support column away from the substrate abuts against the diffusion plate.

11. A display device, characterized in that: include: The backlight module as claimed in any one of claims 1 to 10.

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