Single-light-bar reflective backlight lens and display
By designing a single-light reflective backlight lens to optimize the light refractive and reflection path, the problems of light uniformity and cost in the existing direct-down backlight technology are solved, and the display is efficient and energy-saving and spot uniformity are achieved.
Patent Information
- Application Number
- CN202422661514.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing direct-down backlight technology has the problems of high manufacturing costs, complex processes and poor light uniformity. In particular, the large OD value single light strip solution requires screen printing of black circles on PCB aluminum substrate or screen printing dots on diffusion plates, resulting in high production costs and insufficient light uniformity.
A single-light strip reflective backlight lens is designed, adopting a lens body structure, including a light source-shaped cavity, a total reflective curved surface and a light exit surface. The light path is optimized through light refraction and reflection, avoiding opening or silk-printing on the light strip, reflective paper and diffusion plate, and improving the light expansion angle and uniformity.
It can improve the light expansion angle and uniformity of the light strip without additional processing, reduce production costs, and ensure that the display generates uniform spots in energy-saving situations.
Smart Images
Figure CN223139995U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of displays, in particular to a single light bar reflective backlight lens and a display. Background Technique
[0002] With the popularization of the direct-lit backlight technology, this technology has been widely used in liquid crystal TVs at present. This technology can provide a more uniform light distribution for the TV, which helps to improve the color performance and contrast of the TV. The existing direct-lit backlight technology includes a multi-light bar scheme and a single light bar scheme with a large OD value. The OD value refers to the light mixing distance between the surface of the light bar on the printed circuit board and the lower surface of the diffusion plate. A large OD value generally means that the light mixing distance is ≥ 30 mm. Since the multi-light bar scheme requires a large number of light bars, the consumption of supporting lamp beads and the PCB aluminum substrate for installing the light bars will also increase, resulting in a high manufacturing cost. And for the existing single light bar scheme with a large OD value, due to poor aperture uniformity and obvious bright bands, it is necessary to screen-print black circles on the PCB aluminum substrate and also punch holes in the reflective paper. Even more, it is necessary to screen-print dots on the diffusion plate to achieve secondary reflection in order to compensate for the peripheral brightness and reduce the brightness on the lamp. Or directly screen-print tiny black dots on the lamp to change the light trajectory, reduce the superimposed luminance, and improve the overall uniformity. It can be seen that the above methods also have the problems of complex process, large workload, and high production cost. Content of the Utility Model
[0003] In order to solve the above problems, the utility model provides a single light bar reflective backlight lens, which includes a lens body. The whole is a rotating body formed by a plane figure rotating around the central axis. A light source cavity for placing a light source is arranged at the bottom of the lens body. An incident light surface is arranged on the wall of the light source cavity. The incident light surface includes a first incident light surface on the top curved surface wall of the light source cavity and a second incident light surface on the side curved surface wall of the light source cavity. A total reflection curved surface is arranged at the top of the lens body. The total reflection curved surface is formed by a first arc rotating around the central axis of the lens body. The first arc satisfies the equation , where x ≥ 0, y ≥ 0. An outgoing light surface is arranged on the side wall of the lens body. The outgoing light surface is arranged between the total reflection curved surface and the incident light surface. The outgoing light surface includes a first circular arc outgoing light surface and a second circular arc outgoing light surface. The first circular arc outgoing light surface is connected to the total reflection curved surface. The second circular arc outgoing light surface is connected to the bottom of the lens body. A waist is formed by the connection of the first circular arc outgoing light surface and the second circular arc outgoing light surface and is recessed towards the inside of the lens body. The first circular arc outgoing light surface satisfies the free-form surface formula , and the second circular arc outgoing light surface satisfies the free-form surface formula , where c1 and c2 are the curvatures of the surface vertices, k1 and k2 are the quadratic aspheric coefficients, and a1, a2, a3, a4, a5, a6, a7, a8, a9, a 10 are the aspheric coefficients.
[0004] Preferably, the top curved surface wall is formed by rotating a second arc that bends away from the total reflection curved surface around the central axis of the lens body.
[0005] Preferably, the side curved surface wall is formed by rotating a straight line around the central axis of the lens body.
[0006] Preferably, the lens body is made of silicone material.
[0007] Preferably, there are also spark patterns provided on the side wall of the lens body.
[0008] Preferably, there are also microstructures provided on the side wall of the lens body.
[0009] Preferably, the microstructure is a serrated pattern.
[0010] Preferably, there are also fan-shaped column feet provided at the bottom of the lens body.
[0011] Preferably, there is also an overflow glue groove provided at the bottom of the lens body, and the overflow glue groove is radially arranged with the light source cavity as the center.
[0012] The beneficial effects are as follows: In this application, there is no need to open holes or perform screen printing on the light bar, reflective paper, and diffusion plate. By improving the structure of the backlight lens, the light expansion angle and uniformity of the light bar can be improved. After the light is emitted from the light source, a part of the light is refracted through the light source cavity and the first light incident surface to the total reflection curved surface, and then totally reflected by the total reflection curved surface to the first circular arc light exit surface, and projected out through the first circular arc light exit surface. This part of the light path finally gets closer and closer to parallel light after multiple changes. Another part of the light passes through the light source cavity and the second light incident surface, is refracted to the second circular arc light exit surface, and then projected out through the second circular arc light exit surface. This part of the light path also finally gets closer and closer to parallel light after multiple changes. In this way, it is ensured that the light source located on the light source cavity is expanded from a small-angle ultra-bright light spot to an ultra-large-angle low-brightness uniform circular light spot by this backlight lens.
[0013] To achieve the above object, this application also provides a display, which includes the above single-light-bar reflective backlight lens. The single-light-bar reflective backlight lens adopted by this display can effectively adjust the outgoing light of the display so that the display can produce a bright and uniform light spot under the condition of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The drawings described herein are used to provide a further understanding of this application and form a part of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:
[0015] Figure 1 is a schematic diagram of the overall structure of the single-light-bar reflective backlight lens of the present utility model;
[0016] Figure 2 This is a schematic diagram of the overall structure of the single-light-bar reflective backlight lens of the present utility model from another angle;
[0017] Figure 3 This is a cross-sectional view of the single-light-bar reflective backlight lens of the present utility model;
[0018] Figure 4 These are comparison photos of the effects before and after the light source is processed by the single-light-bar reflective backlight lens of the present utility model;
[0019] In the figures:
[0020] 1. Lens body; 11. Total reflection curved surface; 12. Light-emitting surface; 121. First arc light-emitting surface; 122. Second arc light-emitting surface; 123. Waist;
[0021] 2. Light source cavity; 21. Light-incident surface; 211. First light-incident surface; 212. Second light-incident surface;
[0022] 3. Sector-shaped column feet;
[0023] 4. Glue overflow groove. Specific embodiments
[0024] The following will disclose multiple embodiments of the present utility model with diagrams. For the sake of clarity, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present utility model. That is to say, in some embodiments of the present utility model, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some conventional structures and components will be shown in the diagrams in a simple schematic manner.
[0025] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the drawings. If this specific posture changes, then the directional indications will also change accordingly.
[0026] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence, nor are they used to limit the present utility model. They are merely used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0027] Embodiment
[0028] Please refer to Figures 1 to 3 , Figure 1 , which is a schematic diagram of the overall structure of the single-light-strip reflective backlight lens of the present utility model. Figure 2 , which is a schematic diagram of the overall structure of the single-light-strip reflective backlight lens from another angle of the present utility model. Figure 3 , which is a cross-sectional view of the single-light-strip reflective backlight lens of the present utility model. This embodiment provides a single-light-strip reflective backlight lens, including a lens body 1 made of high-transparency plastic materials such as silicone or PC, PMMA, etc. The whole is a rotating body formed by a planar figure rotating around the central axis. A light source cavity 2 for placing a light source is provided at the bottom of the lens body 1. The light source can be an LED or a COB blue light chip light source. An incident light surface 21 is provided on the wall of the light source cavity 2. The incident light surface 21 includes a first incident light surface 211 on the top curved surface wall of the light source cavity 2 and a second incident light surface 212 on the side curved surface wall of the light source cavity 2. A total reflection curved surface 11 is provided at the top of the lens body 1. The total reflection curved surface 11 is formed by a first arc rotating around the central axis of the lens body 1. The first arc satisfies the equation , where \(x\geq0\) and \(y\geq0\). The total reflection surface 11 of this design can reflect all the light rays refracted from the first light incident surface 211 onto the first arc light output surface 121, effectively improving the brightness uniformity of the expanded circular light spot in the central area. An optical surface 12 is provided on the side wall of the lens body 1. The optical surface 12 is provided between the total reflection surface 11 and the light incident surface 21. The optical surface 12 includes a first arc light output surface 121 and a second arc light output surface 122. The first arc light output surface 121 is connected to the total reflection surface 11, and the second arc light output surface 122 is connected to the bottom of the lens body 1. A waist 123 is formed by a depression towards the inside of the lens body 1 at the connection of the first arc light output surface 121 and the second arc light output surface 122. This waist 123 design enables the light rays projected from the first arc light output surface 121 and the light rays projected from the second arc light output surface 122 to be superimposed in some areas, thereby effectively improving the overall brightness uniformity of the expanded circular light spot. The first arc light output surface 121 satisfies the free-form surface formula , and the second arc light output surface 122 satisfies the free-form surface formula , where \(c1\) and \(c2\) are the curvatures of the surface vertices, \(k1\) and \(k2\) are the aspherical coefficients of the second order, and \(a1, a2, a3, a4, a5, a6, a7, a8, a9, a\) 10 are the aspherical coefficients. The first arc light output surface 121 can adjust the light rays reflected from the total reflection surface 11, and the second arc light output surface 122 can adjust the light rays refracted from the second light incident surface 212, making all the light rays approximately parallel in general.
[0029] After the light rays are emitted by the LED or COB blue light chip light source, a part of the light rays are refracted by the light source cavity 2 and the first light incident surface 211 to the total reflection surface 11, and then totally reflected by the total reflection surface 11 to the first arc light output surface 121 and projected out through the first arc light output surface 121. After multiple changes in the path of this part of the light rays, they finally get closer and closer to parallel light. Another part of the light rays pass through the light source cavity 2 and the second light incident surface 21 and are refracted to the second arc light output surface 122, and then projected out through the second arc light output surface 122. After multiple changes in the path of this part of the light rays, they also finally get closer and closer to parallel light. In this way, it is ensured that the light source located on the light source cavity 2 is expanded from a small-angle super-bright light spot to an ultra-large-angle low-brightness uniform circular light spot by this backlight lens.
[0030] In another embodiment of the present invention, the top curved surface wall is formed by rotating a second arc that bends away from the total reflection surface 11 around the central axis of the lens body 1, and the side curved surface wall is formed by rotating a straight line around the central axis of the lens body 1. The side curved surface wall and the central axis of the lens body 1 are arranged at an angle, and the angle is between 12° and 15°. By setting this angle, the angle of the light rays emitted by the light source can be adjusted to facilitate the adjustment of the size and brightness uniformity of the central light spot.
[0031] In order to further improve the uniformity of the central light spot and prevent the generation of bright spots due to local light concentration, a spark pattern and / or microstructures can also be provided on the side wall of the lens body 1. The microstructures such as sawtooth patterns can scatter the light reflected from the total reflection surface 11 and the light refracted from the second light incident surface 212, so that the backlight lens emits uniform light;
[0032] Please refer to Figure 4 , Figure 4 which is a comparison photo of the effects before and after the light source is processed by the single lamp bar reflective backlight lens of the present invention. Figure 4 On the left is the illuminance schematic diagram and illuminance curve when the backlight lens of the present invention is not placed on the light source surface. It can be seen from the figure that the illuminance range is small, the central illuminance exceeds 60000 Lux, the spot range area is extremely small, the central brightness is extremely high, and the uniformity is extremely poor. Figure 4 On the right is the illuminance schematic diagram and illuminance curve when the backlight lens of the present invention is placed on the light source surface. It can be seen from the figure that the illuminance range is large, the central illuminance is less than 300 Lux, and the highest illuminance does not exceed 1000 Lux. It can be seen from the comparison photo of the effects before and after that after being processed by the single lamp bar reflective backlight lens of the present invention, the spot range area becomes larger, the central brightness is greatly reduced, and the backlight uniformity is effectively improved.
[0033] In another embodiment of the present invention, a sector-shaped columnar foot 3 is further provided at the bottom of the lens body 1. The sector-shaped columnar foot 3 can be used as a positioning and identification part. During the component placement process of the SMT mounter and when the backlight lens is mounted on the PCB lamp bar, the backlight lens can be accurately identified and positioned by the component placement device of the SMT mounter through the sector-shaped columnar foot 3, and then transferred and mounted on the PCB lamp bar by the component placement device of the SMT mounter, thereby improving the positioning accuracy and realizing the precise mounting of the backlight lens on the PCB lamp bar. A spark pattern can also be provided on the surface of the sector-shaped columnar foot 3 to increase the pushing and pulling force between the backlight lens and the PCB lamp bar, so that the backlight lens is not easily detached.
[0034] In another embodiment of the present invention, a glue overflow groove 4 is further provided at the bottom of the lens body 1. The glue overflow groove 4 radially penetrates through the sector-shaped columnar foot 3 with the light source cavity 2 as the center. During the component placement process of the SMT mounter, the backlight lens is prone to problems with vacuum adsorption due to extrusion, and internal air expansion is likely to occur during the thermal curing process, resulting in the offset of the backlight lens. By providing the glue overflow groove 4, the air and heat inside the backlight lens are discharged to avoid the above problems. At the same time, the glue overflow groove 4 can also play a role in timely discharging excess glue.
[0035] In summary, the present application does not require opening holes or silk-screening on the light bar, reflective paper, and diffusion plate. By improving the structure of the backlight lens, the light expansion angle and uniformity of the light bar can be improved.
[0036] In an embodiment of the present invention, a display is provided. The display can adopt the above single light bar reflective backlight lens to effectively adjust the outgoing light of the display, so that the display produces a bright and uniform light spot under the condition of energy saving.
[0037] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.
Claims
1. A single-light-bar reflective backlight lens, characterized in that, It includes a lens body (1), which is a rotating body formed by rotating a planar graph around a central axis. A light source cavity (2) for placing a light source is provided at the bottom of the lens body (1). An incident light surface (21) is provided on the wall of the light source cavity (2). The incident light surface (21) includes a first incident light surface (211) located on the top curved surface wall of the light source cavity (2) and a second incident light surface (212) located on the side curved surface wall of the light source cavity (2). A total reflection curved surface (11) is provided at the top of the lens body (1). The total reflection curved surface (11) is formed by rotating a first arc around the central axis of the lens body (1). The first arc satisfies the equation x = y 2 , where x≥0 and y≥0. An outgoing light surface (12) is provided on the side wall of the lens body (1). The outgoing light surface (12) is provided between the total reflection curved surface (11) and the incident light surface (21). The outgoing light surface (12) includes a first circular arc outgoing light surface (121) and a second circular arc outgoing light surface (122). The first circular arc outgoing light surface (121) is connected to the total reflection curved surface (11). The second circular arc outgoing light surface (122) is connected to the bottom of the lens body (1). A waist (123) is formed by the depression of the connection between the first circular arc outgoing light surface (121) and the second circular arc outgoing light surface (122) towards the inside of the lens body (1). The first circular arc outgoing light surface (121) satisfies the free-form surface formula The second circular arc outgoing light surface (122) satisfies the free-form surface formula where c1 and c2 are the curvatures of the surface vertices, k1 and k2 are the quadratic aspheric coefficients, and a1, a2, a3, a4, a5, a6, a7, a8, a9, a 10 are the aspheric coefficients.
2. The single-light-bar reflective backlight lens according to claim 1, wherein The top curved surface wall is formed by rotating a second arc that bends away from the total reflection curved surface (11) around the central axis of the lens body (1).
3. The single-light-bar reflective backlight lens according to claim 1, characterized in that, The side curved surface wall is formed by rotating a straight line around the central axis of the lens body (1).
4. The single lamp bar reflective backlight lens according to claim 1, wherein The lens body (1) is made of silica gel material.
5. The single lamp bar reflective backlight lens according to claim 1, wherein Spark patterns are further provided on the side wall of the lens body (1).
6. The single-light-bar reflective backlight lens according to claim 1, wherein Microstructures are further provided on the side wall of the lens body (1).
7. The single-light-bar reflective backlight lens according to claim 6, wherein, The microstructures are serrated patterns.
8. The single-light-bar reflective backlight lens according to claim 1, wherein Sector-shaped column feet (3) are further provided at the bottom of the lens body (1).
9. The single lamp bar reflective backlight lens according to claim 1, wherein, An overflow glue groove (4) is further provided at the bottom of the lens body (1), and the overflow glue groove (4) is radially arranged with the light source cavity (2) as the center.
10. A display, characterized in that, It includes the single lamp bar reflective backlight lens according to any one of claims 1 to 9.