A backlight with adjustable light emission angle

Abstract

This utility model relates to the field of backlight technology, and more particularly to a backlight with an adjustable light emission angle. It includes a mounting frame, a reflector, a light strip, a light guide plate, a diffuser plate, a focusing prism sheet, a rotating shaft, and a driving assembly. The reflector, light strip, light guide plate, and diffuser plate are sequentially mounted within the mounting frame from back to front. Multiple rotating shafts are evenly spaced and rotatably connected to the mounting frame from left to right. A focusing prism sheet is connected to each rotating shaft, and both the rotating shaft and the focusing prism sheet are located between the light guide plate and the diffuser plate. A driving assembly is located at the top of the mounting frame to drive the rotating shafts to rotate the focusing prism sheet and adjust its angle. By dynamically adjusting the light emission angle through the rotation of the focusing prism sheet, the limitation of the fixed light emission angle of traditional backlights is overcome. It allows for flexible switching between protecting privacy and providing a wide viewing angle, meeting the specific needs of different scenarios. This not only enhances the functionality of the device but also improves the user experience.

Description

Technical Field

[0001] This utility model relates to the field of backlight technology, and in particular to a backlight with an adjustable light emission angle. Background Technology

[0002] Backlights typically use LED strips as the light source. These strips consist of multiple light-emitting diodes arranged and fixed to the side of a light guide plate. The light guide plate evenly distributes the light onto the display panel, providing a stable backlight effect. However, traditional backlights have the limitation of a fixed light emission angle, making them unsuitable for different usage scenarios. In public office spaces, a fixed-angle backlight can easily lead to the leakage of information from the sides; in scenarios with multiple viewers, it cannot provide a sufficient viewing angle; furthermore, existing technologies using privacy screen protectors or other additional solutions significantly reduce display brightness and cannot achieve dynamic adjustment. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] In order to overcome the shortcomings of traditional backlights, such as fixed light emission angle, easy information leakage, inability to provide sufficient viewing angle, and the significant reduction in brightness caused by additional solutions such as privacy films, and the inability to achieve dynamic adjustment, this utility model aims to provide a backlight with an adjustable light emission angle that can dynamically adjust the light emission angle while maintaining brightness.

[0005] (2) Technical solution

[0006] An adjustable backlight includes a mounting frame, a reflector, a light strip, a light guide plate, and a diffuser plate. The reflector, light strip, light guide plate, and diffuser plate are installed sequentially from back to front within the mounting frame. The backlight also includes a focusing prism sheet, a rotating shaft, and a driving assembly. Multiple rotating shafts are rotatably connected at even intervals from left to right on the mounting frame. A focusing prism sheet is connected to each rotating shaft. Both the rotating shaft and the focusing prism sheet are located between the light guide plate and the diffuser plate. A driving assembly is provided at the top of the mounting frame to drive the rotating shafts to rotate the focusing prism sheet and adjust its angle.

[0007] Preferably, the drive assembly includes a first gear, a rotating shaft, and a second gear. The upper part of each rotating shaft is connected to a first gear located outside the mounting frame. Multiple rotating shafts are rotatably connected at even intervals from left to right on the top of the mounting frame. Each rotating shaft is connected to a second gear. Each rotating shaft and the second gear are located between two adjacent rotating shafts. The second gear meshes with the two first gears adjacent to it.

[0008] Preferably, it also includes a protective cover, which is attached to the top of the mounting frame to cover the entire drive assembly.

[0009] Preferably, it also includes a motor, with the motor mounted on the top of the protective cover, and the output shaft of the motor connected to the rightmost rotating shaft.

[0010] Preferably, it also includes a support plate, and the top of the protective cover is connected to the support plate for covering and protecting the motor.

[0011] Preferably, the mounting frame is coated with a high-reflectivity coating.

[0012] (3) Beneficial effects

[0013] 1. This utility model overcomes the limitation of fixed light emission angle in traditional backlights by dynamically adjusting the light emission angle through the rotation of a focusing prism. It allows for flexible switching between protecting privacy and providing a wide viewing angle, meeting specific needs in different scenarios. This not only enhances the functionality of the device but also improves the user experience.

[0014] 2. This utility model uses a reflector, a diffuser, and a focusing prism to concentrate light, which does not significantly reduce brightness and improves display effect compared to privacy films.

[0015] 3. This utility model uses a simple mechanical method to adjust the beam angle, which is simple, reliable, low-cost, easy to implement, and suitable for large-scale production. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is an exploded view of the present invention.

[0018] Figure 3 This is a partial three-dimensional structural diagram of the present invention. Figure 1 .

[0019] Figure 4 This is a partial three-dimensional structural diagram of the present invention. Figure 2 .

[0020] The markings in the attached diagram are: 1-mounting frame, 2-reflector, 3-lamp strip, 4-light guide plate, 5-diffuser plate, 6-focusing prism sheet, 7-rotating shaft, 8-gear one, 9-rotating shaft, 10-gear two, 11-support plate, 12-motor, 13-protective cover. Detailed Implementation

[0021] See Figures 1-4An adjustable backlight source includes a mounting frame 1, a reflector 2, a light strip 3, a light guide plate 4, a diffuser 5, a focusing prism sheet 6, a rotating shaft 7, a drive assembly, a support plate 11, a motor 12, and a protective cover 13. The reflector 2, light strip 3, light guide plate 4, and diffuser 5 are sequentially mounted inside the mounting frame 1 from back to front. Multiple rotating shafts 7 are rotatably connected to the mounting frame 1 at even intervals from left to right. The focusing prism sheet 6 is connected to each rotating shaft 7, and both the rotating shafts 7 and the focusing prism sheet 6 are located between the light guide plate 4 and the diffuser 5. A drive assembly is located at the top of the mounting frame 1 to drive the rotating shafts 7 to rotate and adjust the angle of the focusing prism sheet 6. The drive assembly includes a gear 8, a rotating shaft 9, and a gear 10. The upper part of each rotating shaft 7 is connected to a gear 8 located outside the mounting frame 1. The component is rotatably connected with multiple rotating shafts 9 at even intervals from left to right. Each rotating shaft 9 is connected with a gear 10. Each rotating shaft 9 and gear 10 is located between two adjacent rotating shafts 7. Gear 10 meshes with two adjacent gears 8. A protective cover 13 is connected to the top of the mounting frame 1 to cover the entire drive assembly and protect it from dust and external force damage. A motor 12 is mounted on the top of the protective cover 13. The output shaft of the motor 12 is connected to the rightmost rotating shaft 7, driving the rightmost rotating shaft 7 to rotate, thereby automatically adjusting the angle of the condensing prism 6, saving manpower and operation time. A support plate 11 for covering and protecting the motor 12 is connected to the top of the protective cover 13. The support plate 11 is L-shaped. The inside of the mounting frame 1 is coated with a high-reflectivity coating to improve light utilization.

[0022] After the light strip 3 is activated, it emits light. The light passes through the light guide plate 4 and is also reflected back to the light guide plate 4 by the reflector plate 2, improving light utilization. The light continues to pass through the light guide plate 4 and enters the diffuser plate 5, where it scatters the light to make the light distribution more uniform. Then, the light enters the focusing prism sheet 6 and is emitted, forming the initial backlight path. The motor 12 is activated, driving the rightmost rotating shaft 7 to rotate the gear 8 on it. The rotation of gear 8 drives the adjacent gear 10 to rotate synchronously, thereby driving all gears 8 and 10 to rotate synchronously. This, in turn, drives all rotating shafts 7 to rotate synchronously, causing all focusing prism sheets 6 to rotate and adjust their angles, thus changing the direction of light emission. When the focusing prism 6 is rotated 90 degrees to be perpendicular to the diffuser plate 5, it directs the light directly forward, reducing the possibility of leakage from the side and effectively preventing information leakage from the side, thus meeting the need for privacy protection. When the focusing prism 6 is rotated to be parallel to the diffuser plate 5, it diffuses the light at a wider angle, providing a sufficient viewing angle to meet the needs of multiple viewers. This overcomes the limitation of the fixed light emission angle of traditional backlights, and can flexibly switch between protecting privacy and providing a wide viewing angle to meet the specific needs of different scenarios. This not only enhances the functionality of the device but also improves the user experience, while avoiding brightness reduction and maintaining a good display effect.

Claims

1. A backlight with adjustable light emitting angle, comprising a mounting frame (1), a reflecting plate (2), a lamp strip (3), a light guide plate (4) and a diffusion plate (5), the reflecting plate (2), the lamp strip (3), the light guide plate (4) and the diffusion plate (5) are sequentially mounted in the mounting frame (1) from back to front, characterized in that, It also includes a focusing prism sheet (6), a rotating shaft (7) and a drive assembly. Multiple rotating shafts (7) are evenly spaced from left to right on the mounting frame (1). The focusing prism sheet (6) is connected to the rotating shaft (7). The rotating shaft (7) and the focusing prism sheet (6) are both located between the light guide plate (4) and the diffuser plate (5). The top of the mounting frame (1) is provided with a drive assembly to drive the rotating shaft (7) to rotate the focusing prism sheet (6) and adjust its angle.

2. The backlight of claim 1, wherein, The drive assembly includes gear one (8), rotating shaft (9) and gear two (10). The upper part of each rotating shaft (7) is connected to gear one (8) located outside the mounting frame (1). Multiple rotating shafts (9) are evenly spaced from left to right on the top of the mounting frame (1). Gear two (10) is connected to each rotating shaft (9). Each rotating shaft (9) and gear two (10) are located between two adjacent rotating shafts (7). Gear two (10) meshes with two adjacent gear one (8).

3. A backlight source with an adjustable light emission angle according to claim 2, characterized in that, It also includes a protective cover (13), which is attached to the top of the mounting frame (1) to cover the entire drive assembly.

4. A backlight source with an adjustable light emission angle according to claim 3, characterized in that, It also includes a motor (12), which is mounted on the top of the protective cover (13), and the output shaft of the motor (12) is connected to the rightmost rotating shaft (7).

5. A backlight source with an adjustable light emission angle according to claim 4, characterized in that, It also includes a support plate (11), and the top of the protective cover (13) is connected to the support plate (11) for covering and protecting the motor (12).

6. A backlight source with an adjustable light emission angle according to claim 5, characterized in that, The mounting frame (1) is coated with a high-reflectivity coating.

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