Backlight reflecting plate for brightening

Abstract

The utility model discloses a backlight reflecting plate for brightening, which relates to the technical field of backlight reflecting plates and comprises a main body base, the main body base is of a cylindrical structure with an opening at one end, and a main body substrate is fixedly arranged at the opening of the main body base. A first reflecting surface for reflecting light for the first time is fixedly arranged at the central position of one end, close to the main body base, of the main body substrate, and a second reflecting surface which is matched with the first reflecting surface and is used for reflecting light for the second time is arranged at the bottom of the main body base; an arc-shaped incident plane for concentrating incident light is fixedly arranged at the center position of the bottom of the main body base; the Fresnel reflecting surface is adopted, light transmitted to the reflecting surface is approximately vertically reflected to the light guide plate, the light emitting efficiency can be greatly improved, the overall brightness of backlight is improved, and the uniformity is improved; the contact surface of the Mini film and the light guide plate is of a plane structure, and the structural strength of a Mini product can be improved.

Description

Technical Field

[0001] This utility model relates to the field of backlight reflector technology, specifically to a backlight reflector for enhancing brightness. Background Technology

[0002] The existing backlight reflective film solution for Mini products uses conventional materials. The light reflected to the bottom surface is diffusely reflected to the light guide plate for mixing. Only a portion of the light reflected to the reflective film propagates upward through the light guide plate and light-diffusing film to reach the human eye and be utilized. Most of the light is reflected due to the large incident angle and cannot be utilized, which affects the light output efficiency.

[0003] As people increasingly demand thinner, lighter, and brighter Mini products, higher requirements are being placed on light sources and backlight systems. Traditional brightness enhancement solutions, such as lenses, adhesives, diffusion films, or light guide plates, suffer from high costs, low efficiency, and susceptibility to damage. Utility Model Content

[0004] The purpose of this utility model is to provide a backlight reflector for enhancing brightness, thereby solving the technical problems of high cost, low efficiency, and easy damage in traditional brightness enhancement solutions.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A backlight reflector for enhancing brightness includes a main base, which is a cylindrical structure with one open end. A main substrate is fixedly disposed at the opening of the main base. A first reflective surface for the first reflection of light is fixedly disposed at the center of one end of the main substrate near the main base. A second reflective surface that cooperates with the first reflective surface for the second reflection of light is disposed at the bottom of the main base. An arc-shaped incident surface for concentrating incident light is fixedly disposed at the center of the bottom of the main base.

[0007] Preferably, the first reflecting surface is a rotationally symmetric parabolic surface, and the second reflecting surface is a plurality of concentric sawtooth Fresnel reflecting surfaces.

[0008] Preferably, both the first reflective surface and the Fresnel reflective surface are provided with a high-reflectivity coating.

[0009] Preferably, the high-reflectivity coating is silver-plated, aluminum-plated, or a nanocomposite material.

[0010] Preferably, the main substrate is made of a high-transmittance material, including PMMA or silicone rubber.

[0011] Preferably, the sawtooth structure of the arc-shaped incident surface is designed to reflect light along the optical axis, so that the reflected light propagates almost perpendicular to the plane of the diffuser plate.

[0012] Preferably, the rotationally symmetric parabolic surface of the first reflecting surface and the Fresnel reflecting surface of the second reflecting surface form a three-segment light reflection path.

[0013] Preferably, the serration spacing of the Fresnel reflector is 0.1-0.5 mm, and the serration height is 0.05-0.2 mm.

[0014] Preferably, the parabolic radius of curvature of the first reflective surface matches the size of the Mini LED light source, ranging from 2 to 10 mm.

[0015] Preferably, the reflectivity of the high-reflectivity coating is ≥95%.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model uses a Fresnel reflector to reflect the light propagating to the reflector to the light guide plate in a near-vertical manner, which can greatly increase the light output efficiency, improve the overall brightness of the backlight, and improve the uniformity; the contact surface between this invention and the light guide plate is a planar structure, which can increase the structural strength of the Mini product.

[0018] (2) This utility model reduces the high reflectivity due to excessive incident angle, which can effectively improve light energy utilization and increase brightness. The light is divided into three segments by the reflection and mixing distance, which can reduce OD and expand the irradiation area. Finally, the expanded light reaches the diffuser plate for mixing and homogenization. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional structural diagram of a backlight reflector for enhancing brightness according to this utility model.

[0021] Figure 2 This is a cross-sectional structural schematic diagram of a backlight reflector for enhancing brightness according to this utility model.

[0022] Figure 3 This is a schematic diagram of the light-reflecting surface of this utility model;

[0023] Figure 4 This is a comparison diagram showing the simulated effects of the structure of this utility model without (left) and with (right) the structure of this utility model.

[0024] In the figure: 10, main substrate; 20, main base; 30, first reflecting surface; 40, arc-shaped incident surface; 50, second reflecting surface. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Please see Figures 1-4 As shown, this utility model is a backlight reflector for enhancing brightness, including a main base 20. The main base 20 is a cylindrical structure with one open end. A main substrate 10 is fixedly disposed at the opening of the main base 20. A first reflective surface 30 for the first reflection of light is fixedly disposed at the center of one end of the main substrate 10 near the main base 20. A second reflective surface 50, which cooperates with the first reflective surface 30 for the second reflection of light, is disposed at the bottom of the main base 20. An arc-shaped incident surface 40 for concentrating incident light is fixedly disposed at the center of the bottom of the main base 20.

[0029] In an optional embodiment, the first reflecting surface 30 is a rotationally symmetric parabolic surface, and the second reflecting surface 50 is a plurality of concentric sawtooth Fresnel reflecting surfaces.

[0030] It should be noted that by combining a parabolic surface with a Fresnel reflector, the light reflection path is optimized, the incident angle is reduced, and the light energy utilization rate is improved.

[0031] In an optional embodiment, both the first reflective surface 30 and the second reflective surface 50 are provided with a high-reflectivity coating.

[0032] In an optional embodiment, the high-reflectivity coating is silver-plated, aluminum-plated, or a nanocomposite material.

[0033] Furthermore, the high-reflectivity coating is a UV-curable coating containing high-refractive-index particles such as TiO2 and SiO2.

[0034] In an optional embodiment, the main substrate 10 is made of a high-transmittance material, including PMMA or silicone rubber.

[0035] It should be noted that the host substrate 10, made of a high-transmittance material, allows unreflected light to pass through efficiently, avoiding energy loss caused by material absorption.

[0036] In an optional embodiment, the second reflective surface 50 is designed with a sawtooth structure to reflect light along the optical axis, so that the reflected light propagates approximately perpendicular to the plane of the diffuser plate.

[0037] It should be noted that the arc-shaped structure of the arc-shaped incident surface 40 can reduce the incident angle of light, increase the light transmittance, expand the beam diffusion area, and improve the brightness uniformity.

[0038] In an optional embodiment, the rotationally symmetric parabolic surface of the first reflecting surface 30 and the Fresnel reflecting surface of the second reflecting surface 50 form a three-segment light reflection path.

[0039] It should be noted that the light is divided into three segments by the reflection and mixing distance, which can reduce the OD and increase the illumination area.

[0040] In an optional embodiment, the serration spacing of the Fresnel reflector is 0.1-0.5 mm, and the serration height is 0.05-0.2 mm.

[0041] It should be noted that by optimizing the control of the light reflection angle, the accuracy of the vertical propagation direction is ensured.

[0042] In an optional embodiment, the parabolic radius of curvature of the first reflective surface 30 is matched with the size of the Mini LED light source, ranging from 2 to 10 mm.

[0043] It should be noted that stray light is reduced by improving the light collection efficiency of the light source.

[0044] In an optional embodiment, the high-reflectivity coating has a reflectivity of ≥95%.

[0045] It should be noted that high reflectivity maximizes light reflection efficiency and improves overall brightness.

[0046] The working principle of this invention is as follows: First, the light emitted by the Mini LED shines on the first reflective surface 30, which is a rotationally symmetric parabolic surface. When the light reaches the first reflective surface 30, most of the light will be reflected to the second reflective surface 50. Second, the second reflective surface 50 is a sawtooth Fresnel reflective surface specially designed according to the light reflected by the first reflective surface 30. It can reflect the light in a direction approximately parallel to the optical axis and propagate approximately perpendicular to the plane of the diffuser plate. The purpose of this is to reduce the high reflectivity due to the large incident angle, which can effectively improve the light energy utilization rate and increase the brightness. The light is divided into three segments through reflection and mixing, which can reduce the OD and expand the irradiation area. Finally, the expanded light reaches the diffuser plate for mixing and homogenization.

[0047] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A back light reflective sheet for brightening, characterized by, The application relates to a light-emitting device, which comprises a main body base (20) in a cylindrical structure with one end open, a main body substrate (10) fixedly arranged at the opening of the main body base (20), a first reflection surface (30) for first reflection of light arranged at the center of one end of the main body base (20) close to the main body substrate (10), a second reflection surface (50) for second reflection of light arranged at the bottom of the main body base (20) and matched with the first reflection surface (30), and an arc-shaped incident surface (40) for concentration of incident light arranged at the center of the bottom of the main body base (20).

2. A back light reflective panel for brightening according to claim 1, wherein The first reflection surface (30) is a rotationally symmetrical parabolic surface, and the second reflection surface (50) is a plurality of concentric sawtooth-shaped Fresnel reflection surfaces.

3. A back light reflective panel for brightening according to claim 1, wherein The first reflection surface (30) and the second reflection surface (50) are both provided with a high-reflection coating.

4. A back light reflective panel for brightening according to claim 3, wherein The high-reflection coating is silver plating, aluminum plating or a nano-composite material.

5. A back light reflective panel for brightening according to claim 1, wherein The main body substrate (10) is made of a high-transmittance material, such as PMMA or silicone rubber.

6. A back light reflective panel for brightening according to claim 2, wherein The sawtooth structure of the second reflection surface (50) is designed to reflect light along the optical axis direction, so that the reflected light propagates perpendicularly to the plane of the diffusion plate.

7. A back light reflective panel for brightening according to claim 2, wherein The rotationally symmetrical parabolic surface of the first reflection surface (30) and the Fresnel reflection surface of the second reflection surface (50) form a three-section light reflection path.

8. A back light reflective panel for brightening according to claim 2, wherein The sawtooth interval of the Fresnel reflection surface is 0.1-0.5 mm, and the sawtooth height is 0.05-0.2 mm.

9. A back light reflective panel for brightening according to claim 2, wherein The curvature radius of the parabolic surface of the first reflection surface (30) matches the size of a Mini LED light source, and the range is 2-10 mm.

10. A back light reflective panel for brightening according to claim 3, wherein The reflectivity of the high-reflection coating is greater than or equal to 95%.

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