Backlight module and display device
By using the lens layer and the microbead layer on the light emitting part of the backlight module to expand the light emitting angle, the problem of poor luminescence uniformity in the prior art is solved, and a thinner and more economical display device design is achieved.
Patent Information
- Application Number
- CN202421819557.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The light uniformity of the existing backlight modules is poor, which makes it difficult for display devices to achieve a lighter and thinner design and is costly.
By providing a lens layer on the light-emitting side cover of the light-emitting member and providing a microbead layer on the light-emitting side of the lens layer, the light-emitting angle of the light-emitting member is expanded and the light-emitting uniformity is improved.
The luminescence uniformity of the backlight module is improved, the cost of the display device is reduced, and a thinner design can be achieved.
Smart Images
Figure CN223020054U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of light-emitting electronic components, in particular to a backlight module and a display device. Background Art
[0002] In recent years, high-end display technologies have been committed to improving the display image quality of display devices, making the bright field of the display screen brighter, the dark field darker, achieving a higher contrast ratio between light and dark, and enabling any details in the display screen to be vividly presented, so as to enhance the user's viewing experience.
[0003] Currently, for a thin and light display device based on a Mini LED backlight, the total number of light-emitting components included in its backlight module can generally reach several thousand or even tens of thousands, which seriously affects the economy of the display device. In order to reduce costs, make the price of the display device more market-friendly, and enhance product competitiveness, the current display device needs to reduce the usage of light-emitting components while maintaining a thin profile. And how to effectively control the manufacturing cost of the display device, so that the display device has good economy and market competitiveness, while ensuring that the display screen of the display device has excellent color saturation and display brightness uniformity to meet the user's viewing experience has become an urgent problem in the industry.
[0004] However, the light-emitting components of the existing backlight modules often have a cosine distribution of the light distribution curve and a small light-emitting angle. In other words, the light emitted by the existing light-emitting components has a problem that the light intensity in the central part is too strong, resulting in poor light-emitting uniformity of the backlight module, requiring a large light mixing distance, and further making it difficult for the display device to achieve a thinner and lighter design. Summary of the Utility Model
[0005] One object of the utility model is to provide a backlight module, the light-emitting components included therein can have a large light-emitting angle, so that the light-emitting uniformity of the backlight module is better.
[0006] Another object of the utility model is to provide a display device, by using the foregoing backlight module, the display brightness uniformity can be improved, and a thinner and lighter design can be achieved.
[0007] To achieve this purpose, the utility model adopts the following technical solutions:
[0008] In the first aspect, a backlight module is provided, including:
[0009] A circuit board;
[0010] A light-emitting component, the light-emitting component is disposed on the circuit board;
[0011] A lens layer, which at least covers the light-emitting side of the light-emitting component, and at least part of the light-emitting surface of the lens layer is a curved surface protruding towards the outside of the lens layer; and,
[0012] A microbead layer, which is at least correspondingly arranged on the light-emitting side of the lens layer corresponding to the middle part of the lens layer, and the microbead layer includes a colloid structure and glass microbeads arranged in the colloid structure.
[0013] As a preferred technical solution of the backlight module, the light-emitting angle of the light-emitting component is θ, and the overall light-emitting angle range of the light-emitting component and the lens layer is 1.07θ to 1.44θ.
[0014] As a preferred technical solution of the backlight module, the light-emitting angle range of the light-emitting component is 125° to 136°, and the overall light-emitting angle range of the light-emitting component and the lens layer is 145° to 180°.
[0015] As a preferred technical solution of the backlight module, the light-emitting surface is in the shape of an elliptical curved surface with a convex middle part, or in the shape of a flat top and a curved surface protruding towards the outside on the periphery, or in the shape of a curved surface with a middle part sunken towards the inside of the lens layer and a curved surface protruding towards the outside on the periphery.
[0016] As a preferred technical solution of the backlight module, the sum of the volumes of all the glass microbeads is the total volume V1, the colloid structure has a volume V2, and 0.1% ≤ V1 / V2 ≤ 10%.
[0017] As a preferred technical solution of the backlight module, the refractive index of the colloid structure is different from that of the lens layer.
[0018] As a preferred technical solution of the backlight module, at least part of the glass microbeads gather in the middle of the upper part of the colloid structure.
[0019] As a preferred technical solution of the backlight module, the density of the glass microbeads is less than the density of the colloid before the colloid structure is solidified.
[0020] As a preferred technical solution of the backlight module, the particle size range of the glass microbeads is 15 to 135 μm.
[0021] As a preferred technical solution of the backlight module, the light-emitting component includes an LED chip, and the LED chip can emit blue light;
[0022] The light-emitting component further includes a phosphor glue layer, and the phosphor glue layer covers at least the light-emitting side of the LED chip. The phosphor glue layer includes green phosphors and red phosphors. Alternatively, the light-emitting component further includes a phosphor film layer, and the phosphor film layer covers at least the light-emitting surface of the LED chip. The phosphor film layer includes green phosphors and red phosphors.
[0023] In a second aspect, a display device is provided, including a diffusion plate and a plurality of backlight modules as described in the first aspect above. The backlight modules are spaced apart on one side of the diffusion plate, and the light-emitting components of the backlight modules can emit light toward the diffusion plate.
[0024] The beneficial effects of the present utility model are as follows:
[0025] By covering a lens layer on the light-emitting side of the light-emitting component and making at least part of the light-emitting surface of the lens layer a curved surface protruding toward the outside of the lens layer, when the light emitted by the light-emitting component is emitted from the light-emitting surface of the lens layer to the outside, the light can be diverged by the lens layer, thereby improving the uniformity of the light intensity distribution of the light emitted from the lens layer and expanding the light-emitting angle of the light-emitting component of the backlight module. At the same time, by providing a microbead layer at least corresponding to the middle part of the lens layer on the light-emitting side of the lens layer, at least part of the light emitted from the middle part of the lens layer can be incident on the glass microbeads, so that diffuse reflection occurs at the glass microbeads, thereby reducing the light intensity at the center of the light emitted from the lens layer and further improving the uniformity of the light intensity distribution of the light emitted from the lens layer, thus improving the light-emitting uniformity of the backlight module. Description of the Drawings
[0026] The present utility model will be further described in detail below with reference to the drawings and embodiments.
[0027] Figure 1 It is a schematic cross-sectional view of a partial structure of the backlight module described in the embodiment.
[0028] Figure 2 It is a schematic cross-sectional view of the structures of the light-emitting component, the lens layer, the microbead layer, and the circuit board described in the embodiment.
[0029] Figure 3 It is a schematic cross-sectional view of the structures of the light-emitting component, the phosphor glue layer, the lens layer (when the light-emitting surface of the lens layer is an elliptical curved surface with a middle bulge), the microbead layer, and the circuit board described in the embodiment.
[0030] Figure 4 It is a schematic cross-sectional view of the structures of the light-emitting component, the phosphor film layer, the lens layer (when the light-emitting surface of the lens layer is an elliptical curved surface with a middle bulge), the microbead layer, and the circuit board described in the embodiment.
[0031] Figure 5Schematic cross-sectional view of the light-emitting element, phosphor glue layer, lens layer (when the light-emitting surface of the lens layer has a shape with a flat top and a curved surface protruding outwardly at the outer periphery), microbead layer, and circuit board described in the embodiment.
[0032] Figure 6 Schematic cross-sectional view of the light-emitting element, fluorescent film layer, lens layer (when the light-emitting surface of the lens layer has a shape with a flat top and a curved surface protruding outwardly at the outer periphery), microbead layer, and circuit board described in the embodiment.
[0033] Figure 7 Schematic cross-sectional view of the light-emitting element, phosphor glue layer, lens layer (when the light-emitting surface of the lens layer has a shape with a middle part recessed inwardly of the lens layer and a curved surface protruding outwardly at the outer periphery), microbead layer, and circuit board described in the embodiment.
[0034] Figure 8 Schematic cross-sectional view of the light-emitting element, fluorescent film layer, lens layer (when the light-emitting surface of the lens layer has a shape with a middle part recessed inwardly of the lens layer and a curved surface protruding outwardly at the outer periphery), microbead layer, and circuit board described in the embodiment.
[0035] Figure 9 Schematic cross-sectional view of the display device described in the embodiment.
[0036] In the figure:
[0037] 1. Backlight module; 10. Circuit board; 11. Light-emitting element; 12. Lens layer; 13. Phosphor glue layer; 14. Fluorescent film layer; 15. Microbead layer; 150. Colloidal structure; 151. Glass microbead.
[0038] 2. Display device; 20. Diffusion plate. Detailed implementation manners
[0039] To make the technical problems solved by the present utility model, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.
[0040] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0041] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0042] As Figure 1 shown in Figure 2 , the present utility model provides a backlight module 1, which includes a circuit board 10, a light-emitting element 11, a lens layer 12, and a microbead layer 15. The light-emitting element 11 is disposed on the circuit board 10. The lens layer 12 at least covers the light-emitting side of the light-emitting element 11. At least a part of the light-emitting surface of the lens layer 12 is a curved surface protruding towards the outside of the lens layer 12. The microbead layer 15 is at least disposed corresponding to the middle part of the lens layer 12 on the light-emitting side of the lens layer 12. The microbead layer 15 includes a colloid structure 150 and glass microbeads 151 disposed in the colloid structure 150. Among them, for the convenience of observation, Figure 1 shown in Figure 2 , the cross-section of the colloid structure 150 is not filled with hatching.
[0043] By covering the light-emitting side of the light-emitting component 11 with the lens layer 12 and making at least part of the light-emitting surface of the lens layer 12 a curved surface protruding towards the outside of the lens layer 12, when the light emitted by the light-emitting component 11 irradiates from the light-emitting surface of the lens layer 12 to the outside, the light can be diverged by the lens layer 12, thereby improving the uniformity of the light intensity distribution of the light emitted from the lens layer 12, so as to expand the light-emitting angle of the light-emitting component 11 of the backlight module 1. At the same time, by arranging the microbead layer 15 on the light-emitting side of the lens layer 12 at least corresponding to the middle part of the lens layer 12, at least part of the light emitted from the middle part of the lens layer 12 can irradiate towards the glass microbeads 151, so as to have diffuse reflection at the glass microbeads 151, and further reduce the light intensity at the center of the light emitted from the lens layer 12, so as to further improve the uniformity of the light intensity distribution of the light emitted from the lens layer 12, thereby improving the light-emitting uniformity of the backlight module 1.
[0044] In addition, by separately arranging the lens layer 12 and the microbead layer 15, the lens layer 12 can be first cured and then the microbead layer 15 provided with the glass microbeads 151 can be cured, so as to be able to more precisely control the relative position of the glass microbeads 151 and the lens layer 12 by controlling the setting position of the microbead layer 15. In other words, the structure controllability of the microbead layer 15 is good, so that the effect of the microbead layer 15 in reducing the light intensity at the center of the light emitted from the lens layer 12 and improving the uniformity of the light intensity distribution of the light emitted from the lens layer 12 is more stable.
[0045] Optionally, a plurality of light-emitting components 11 can be arrayed on the same side of the circuit board 10, and the lens layer 12 is covered on the light-emitting side of each light-emitting component 11, so that the light-emitting area of the backlight module 1 is relatively large.
[0046] Optionally, the light-emitting angle of the light-emitting component 11 is θ, and the overall light-emitting angle range of the light-emitting component 11 and the lens layer 12 is 1.07θ to 1.44θ. In other words, by covering the light-emitting side of the light-emitting component 11 with the lens layer 12, making at least part of the light-emitting surface of the lens layer 12 a curved surface protruding towards the outside of the lens layer 12, and arranging the microbead layer 15 on the light-emitting side at least corresponding to the middle part of the lens layer 12, it can be realized that the light emitted by the light-emitting component 11 with a light-emitting angle of θ reaches a light-emitting angle range of 1.07θ to 1.44θ after passing through the lens layer 12 and the microbead layer 15.
[0047] Optionally, the light-emitting angle range of the actually selected light-emitting component 11 can be 125° to 136°, and the overall light-emitting angle range of the light-emitting component 11 and the lens layer 12 can reach 145° to 180°, so that the light-emitting uniformity of the backlight module 1 is better.
[0048] Exemplarily, the light-emitting angle range of the light-emitting member 11 can be 125°, 126°, 127°, 128°, 129°, 130°, 131°, 132°, 133°, 134°, 135° or 136°, etc. The overall light-emitting angle range of the light-emitting member 11 and the lens layer 12 can reach 145°, 147°, 150°, 152°, 155°, 157°, 160°, 165°, 170°, 175° or 180°, etc. And when the light-emitting angle of the light-emitting member 11 is θ, the overall light-emitting angle of the light-emitting member 11 and the lens layer 12 satisfies the range: 1.07θ to 1.44θ.
[0049] The light-emitting surface of the lens layer 12 can specifically be at least partially of various different shapes that protrude towards the outside of the lens layer 12.
[0050] Such as Figure 3 And Figure 4 As shown, in an alternative embodiment, the light-emitting surface of the lens layer 12 is in the shape of an elliptical curved surface with a central bulge, so that the overall light-emitting surface of the lens layer 12 has the function of diverging the light emitted by the light-emitting member 11.
[0051] Such as Figure 5 And Figure 6 As shown, in another alternative embodiment, the light-emitting surface of the lens layer 12 is in the shape of a plane at the top and a curved surface protruding towards the outside at the periphery, so that the light emitted by the light-emitting member 11 can be refracted at the top of the light-emitting surface of the lens layer 12 and scattered at the periphery of the light-emitting surface of the lens layer 12.
[0052] Such as Figure 7 And Figure 8 As shown, in still another alternative embodiment, the light-emitting surface of the lens layer 12 is in the shape of a central depression towards the inside of the lens layer 12 and a curved surface protruding towards the outside at the periphery, so that the light emitted by the light-emitting member 11 can be scattered at the light-emitting surface of the lens layer 12, and the middle part of the light-emitting surface of the lens layer 12 can scatter the light emitted from the middle part of the light-emitting member 11 to a greater extent, so as to further reduce the light intensity of the light emitted from the middle part of the light-emitting surface of the lens layer 12, thereby better improving the uniformity of the light.
[0053] The colloidal structure 150 has a volume V1, and the sum of the volumes of all the glass microbeads 151 is the total volume V2. It can be understood that the larger the ratio V2 / V1 of the total volume V2 of the glass microbeads 151 to the volume V1 of the colloidal structure 150, the better the diffuse reflection effect of the microbead layer 15 on light. However, the bonding stability of the colloidal structure 150 to the glass microbeads 151 and the lens layer 12 is worse. The smaller the ratio V2 / V1 of the total volume V2 of the glass microbeads 151 to the volume V1 of the colloidal structure 150, the better the bonding stability of the colloidal structure 150 to the glass microbeads 151 and the light-emitting component 11. However, the diffuse reflection effect of the microbead layer 15 on light is worse. Therefore, the ratio V2 / V1 of the total volume V2 of the glass microbeads 151 to the volume V1 of the colloidal structure 150 should not be too large or too small. Based on this, optionally, the ratio V2 / V1 of the total volume V2 of the glass microbeads 151 to the volume V1 of the colloidal structure 150 can satisfy: 0.1% ≤ V2 / V1 ≤ 10%. For example, V2 / V1 can be: 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%, etc.
[0054] Both the colloidal structure 150 and the lens layer 12 can be formed by curing a transparent encapsulating adhesive. Optionally, the refractive indices of the colloidal structure 150 and the lens layer 12 are different, so that there is a refractive index difference between the phosphor glue layer 13 and the microbead layer 15, and the degree of scattering when light passes through the interface between the phosphor glue layer 13 and the microbead layer 15 is greater, which is beneficial to further improving the uniformity of the light emitted by the light-emitting device.
[0055] Optionally, at least part of the glass microbeads 151 gather in the middle of the upper part of the colloidal structure 150, so that the glass microbeads 151 can perform a greater degree of diffuse reflection on the light incident on the middle of the top of the microbead layer 15, so as to be able to reduce the light-emitting intensity of the central part of the overall light-emitting component 11, the lens layer 12 and the microbead layer 15 to a greater extent, so as to further improve the light-emitting uniformity of the backlight module 1.
[0056] Optionally, the density of the glass microbeads 151 is less than the density of the colloid before the colloid structure 150 is cured. Thus, when the colloid structure 150 is not fully cured, the glass microbeads 151 can naturally float upward in the uncured colloid to the top of the colloid structure 150, so that the microbead layer 15 structure with at least part of the glass microbeads 151 located at the top of the colloid structure 150 can be manufactured more simply. Exemplarily, the density range of the glass microbeads 151 can be: 0.12 g / ml to 0.6 g / ml. For example, the density of the glass microbeads 151 can be 0.12 g / ml, 0.15 g / ml, 0.2 g / ml, 0.25 g / ml, 0.3 g / ml, 0.35 g / ml, 0.4 g / ml, 0.45 g / ml, 0.5 g / ml, 0.55 g / ml or 0.6 g / ml, etc., and the density range of the colloid before the colloid structure 150 is cured can be: 1 g / ml to 1.5 g / ml. For example, the density of the colloid before the colloid structure 150 is cured can be: 1 g / ml, 1.05 g / ml, 1.1 g / ml, 1.15 g / ml, 1.2 g / ml, 1.25 g / ml, 1.3 g / ml, 1.35 g / ml, 1.4 g / ml, 1.45 g / ml or 1.5 g / ml, etc.
[0057] It can be understood that the smaller the particle size of the glass microbeads 151, the greater the compressive strength of the glass microbeads 151 under the condition that the volume of the microbead layer 15 remains unchanged, and the greater the number of glass microbeads 151 that the microbead layer 15 can include. Therefore, the better the effect of the microbead layer 15 on diffusing reflection of light. However, the greater the density of the glass microbeads 151, the larger the particle size of the glass microbeads 151, the smaller the compressive strength of the glass microbeads 151, and under the condition that the volume of the microbead layer 15 remains unchanged, the smaller the number of glass microbeads 151 that the microbead layer 15 can include. Therefore, the worse the effect of the microbead layer 15 on diffusing reflection of light. However, the smaller the density of the glass microbeads 151, because when the density of the glass microbeads 151 is less than that of the colloid before the colloid structure 150 is cured, the greater the density difference between the glass microbeads 151 and the colloid before the colloid structure 150 is cured, the faster the glass microbeads 151 automatically float upward in the colloid, so that the working hours required for the manufacturing process of the microbead layer 15 are shorter. Therefore, the particle size of the glass microbeads 151 should not be too large or too small. Based on this, optionally, the particle size of the glass microbeads 151 can meet: 15 μm to 135 μm. For example, the particle size of the glass microbeads 151 can be: 15 μm, 20 μm, 30 μm, 50 μm, 70 μm, 100 μm, 110 μm, 120 μm, 130 μm or 135 μm, etc.
[0058] In order to make the light color of the light emitted by the backlight module 1 different from that of the light emitted by the light-emitting component 11, and at the same time make the backlight module 1 suitable for long-term use in high-temperature and high-humidity environments, phosphor with good high-temperature and high-humidity resistance can be used to adjust the light color of the light emitted by the light-emitting component 11.
[0059] Exemplarily, the light-emitting component 11 can emit blue light, and the phosphor can at least include red phosphor and green phosphor. Thus, among the light emitted by the light-emitting component 11, part of the light excites the phosphor to emit red and green light, and the remaining light is mixed with the red and green light, so that the light emitted by the backlight module 1 is white light.
[0060] Among them, optionally, the phosphor can include but is not limited to silicate, nitride, and fluoride. Exemplarily, the phosphor can include nitride-based β-salon green phosphor and fluoride-based KSF red phosphor, so that the light emitted by the light-emitting component 11 is suitable for realizing high-color gamut display.
[0061] In addition, specifically, the phosphor can be disposed outside the light-emitting component 11 in a variety of different ways.
[0062] Such as Figure 3 、 Figure 5 and Figure 7 shown, in an optional embodiment, the backlight module 1 further includes a phosphor glue layer 13. The phosphor glue layer 13 at least covers the light-emitting side of the light-emitting component 11, and the lens layer 12 at least covers the light-emitting side of the phosphor glue layer 13, so that the phosphor can be disposed on the light-emitting side of the light-emitting component 11 through the phosphor glue layer 13.
[0063] Exemplarily, encapsulation glue, nitride-based β-salon green phosphor, and fluoride-based KSF red phosphor can be mixed and then dot-glued or spray-glued on the light-emitting side of the light-emitting component 11 and cured to form the phosphor glue layer 13.
[0064] Such as Figure 4 、 Figure 6 and Figure 8 shown, in another optional embodiment, the backlight module 1 further includes a phosphor film layer 14. The phosphor film layer 14 at least covers the light-emitting surface of the light-emitting component 11, and the lens layer 12 at least covers the light-emitting side of the phosphor film layer 14, so that the phosphor can be disposed on the light-emitting side of the light-emitting component 11 through the phosphor film layer 14, and since the structure of the phosphor film layer 14 is relatively thin and light, the overall volume of the light-emitting component 11 and the phosphor film layer 14 can be made smaller.
[0065] Exemplarily, encapsulation glue, nitride-based β-salon green phosphor, and fluoride-based KSF red phosphor can be mixed and then molded and cured on the light-emitting side of the light-emitting component 11 to form the phosphor film layer 14.
[0066] In addition, a plurality of light-emitting components 11 distributed in an array can be simultaneously compression-molded to form a fluorescent film layer 14, and the fluorescent film layer 14 can be cut to obtain an integral unit of a single light-emitting component 11 and the fluorescent film layer 14, and the integral unit of the light-emitting component 11 and the fluorescent film layer 14 forms a CSP device.
[0067] As Figure 9 shown, the present utility model further provides a display device 2, including a diffusion plate 20 and a plurality of backlight modules 1 as described in the foregoing technical solution. The backlight modules 1 are arranged at intervals on one side of the diffusion plate 20, and the light-emitting components 11 of the backlight modules 1 can emit light toward the diffusion plate 20. By using the foregoing backlight module 1 with a relatively high light-emitting uniformity, the display brightness uniformity of the display device 2 can be improved, and since the backlight module 1 requires a smaller light mixing distance, the display device 2 can achieve a more thin and light design.
[0068] In the description herein, it should be understood that the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive distinction and have no special meaning.
[0069] In the description of this specification, the description with reference to terms such as "one embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
[0070] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0071] The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present utility model and cannot be construed in any way as a limitation of the protection scope of the present utility model. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present utility model without creative labor, and these embodiments will fall within the protection scope of the present utility model.
Claims
1. A backlight module, characterized in that: include: Circuit boards; A light emitting component, wherein the light emitting component is arranged on the circuit board; A lens layer, wherein the lens layer is at least covered on the light-emitting side of the light-emitting element, and at least a part of the light-emitting surface of the lens layer is a curved surface convex toward the outside of the lens layer; as well as, A microbead layer is provided at least corresponding to the middle portion of the lens layer on the light-emitting side of the lens layer, and the microbead layer comprises a colloid structure and glass microbeads provided in the colloid structure.
2. The backlight module according to claim 1, characterized in that: The light emitting element has a light emitting angle of θ, and the light emitting angle of the light emitting element and the lens layer as a whole ranges from 1.07θ to 1.44θ.
3. The backlight module according to claim 1, characterized in that: The light emitting element has a light emitting angle ranging from 125° to 136°, and the light emitting angle of the light emitting element and the lens layer as a whole ranges from 145° to 180°.
4. The backlight module according to claim 1, characterized in that: The light emitting surface is in the shape of an elliptical surface with a convex middle, or in the shape of a surface with a flat top and a convex outer periphery, or in the shape of a surface with a concave middle portion toward the inside of the lens layer and a convex outer periphery.
5. The backlight module according to any one of claims 1 to 3, characterized in that: The sum of the volumes of all the glass microbeads is a total volume V1, the colloidal structure has a volume V2, and 0.1%≤V1 / V2≤10%.
6. The backlight module according to any one of claims 1 to 3, characterized in that: The colloid structure and the lens layer have different refractive indices.
7. The backlight module according to any one of claims 1 to 3, characterized in that: At least part of the glass microbeads are gathered in the middle of the upper portion of the colloid structure.
8. The backlight module according to claim 7, characterized in that: The density of the glass microspheres is less than the density of the colloid before the colloid structure is solidified.
9. The backlight module according to any one of claims 1 to 3, characterized in that: The particle size of the glass microbeads ranges from 15 to 135 μm.
10. The backlight module according to any one of claims 1 to 3, characterized in that: The light-emitting element comprises an LED chip, and the LED chip can emit blue light; The light-emitting component further includes a fluorescent powder glue layer, which is at least covered on the light-emitting side of the LED chip, or the light-emitting component further includes a fluorescent film layer, which at least covers the light-emitting surface of the LED chip.
11. A display device, characterized in that: It comprises a diffusion plate and a plurality of backlight modules according to any one of claims 1 to 10, wherein the backlight modules are arranged at intervals on one side of the diffusion plate, and the light-emitting components of the backlight modules can emit light toward the diffusion plate.