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CN-224203539-U - Backlight module capable of improving local dimming brightness and vehicle-mounted screen

CN224203539UCN 224203539 UCN224203539 UCN 224203539UCN-224203539-U

Abstract

The invention discloses a backlight module capable of improving local dimming brightness, which comprises a sealed supporting structure formed by wrapping a lower iron frame by a rubberizing frame, wherein an LED lamp is fixed on a PCB (printed circuit board) in the lower iron frame, a light guide plate is positioned in front of the LED lamp and guides light, a diffusion plate and a diffusion film cover the light guide plate in sequence to uniformly light, a plurality of spherical bosses are arranged on the front surface of the light guide plate, the spherical bosses enable the light to be diffused more uniformly through refraction and condensation, a plurality of spherical concave areas are arranged on the back surface of the light guide plate, the LED backlight source can be avoided, and the light is secondarily focused. Compared with the prior art, the light guide plate has the advantages that the plurality of spherical bosses are arranged on the front surface of the light guide plate, the light can be more uniformly diffused by utilizing the refraction and condensation effects of the spherical bosses, and the plurality of spherical concave areas are arranged on the back surface of the light guide plate, so that the LED lamp is avoided, the light is secondarily focused, and the display quality problem caused by non-uniformity of backlight in the local dimming technology is effectively solved.

Inventors

  • ZHANG CHUANWANG

Assignees

  • 信利光电股份有限公司

Dates

Publication Date
20260505
Application Date
20250331

Claims (10)

  1. 1. The backlight module capable of improving the local dimming brightness is characterized in that a gluing frame (11) wraps a lower iron frame (12) to form a closed supporting structure, an LED lamp (3) is fixed on a PCB (2) in the lower iron frame (12), a light guide plate (4) is positioned in front of the LED lamp (3) and guides light, and a diffusion plate (5) and a diffusion film (6) cover the light guide plate (4) in sequence to uniformly light; The front surface of the light guide plate (4) is provided with a plurality of spherical bosses (41), and the spherical bosses (41) enable light to be more uniformly diffused through refraction and condensation; The back of the light guide plate (4) is provided with a plurality of spherical concave areas (42), so that the LED backlight source can be avoided, and light rays are secondarily focused.
  2. 2. The backlight module capable of improving local dimming brightness according to claim 1, wherein a lower brightness enhancement film (71) and an upper brightness enhancement film (72) are further arranged above the diffusion film (6) in sequence.
  3. 3. The backlight module capable of improving local dimming brightness according to claim 2, wherein the upper brightness enhancement film (72) is further provided with a dual brightness enhancement film (8).
  4. 4. The backlight module capable of improving local dimming brightness according to claim 1, wherein a reflective layer is arranged at the edge of the light guide plate (4).
  5. 5. The backlight module capable of improving local dimming brightness according to claim 4, wherein the side wall of the light guide plate (4) is provided with an inclined chamfer structure or a prismatic light guide structure for optimizing the propagation path of light in the light guide plate (4).
  6. 6. The backlight module capable of improving local dimming brightness according to claim 4, wherein the LED lamp (3) is mounted on the PCB (2).
  7. 7. The backlight module capable of improving local dimming brightness according to claim 4, wherein the PCB (2) is fixed on the lower iron frame (12) through a heat conducting double faced adhesive tape (9).
  8. 8. The backlight module capable of improving local dimming brightness according to claim 1, wherein the curvature radius of the spherical boss (41) is 1.5-4.0mm, and the curvature radius of the spherical concave region (42) is 2.0-6.0mm.
  9. 9. The vehicle-mounted screen is characterized by comprising the backlight module capable of improving the local dimming brightness as claimed in any one of claims 1 to 8 and a liquid crystal display panel, wherein the liquid crystal display panel is arranged on the light emitting side of the backlight module.
  10. 10. The vehicle-mounted screen of claim 9, further comprising a touch layer disposed in front of the liquid crystal display panel.

Description

Backlight module capable of improving local dimming brightness and vehicle-mounted screen Technical Field The invention belongs to the field of display, and particularly relates to a backlight module capable of improving local dimming brightness and a vehicle-mounted screen comprising the backlight module. Background Local dimming is a backlighting technique used to improve the contrast and quality of television and display pictures. The basic principle is to divide the backlight (typically LEDs) into a plurality of independently controlled areas or tiles, each of which can be individually adjusted in brightness according to the display content requirements. This technique can reduce the brightness in areas where dark black is desired and increase the brightness in areas where bright details are desired, thereby achieving a better visual effect. However, the existing local dimming backlight module still has the following problems: The patent CN208569259U discloses a display device capable of adjusting light in a region, which only records that the backlight module comprises a light guide plate, the light guide plate is arranged between the back plate and the display screen, and the light emitted by a plurality of light sources can be reflected by the light guide plate, so that the light can be uniformly irradiated on the display screen. Most of traditional light guide plate designs adopt plane or simple prism structures, and the LED light source easily has the problem of uneven light distribution when propagating in the light guide plate, so that local areas are too bright or too dark, and uniformity of display pictures is affected. In addition, due to refraction loss in the light transmission process, partial area brightness is insufficient, and particularly in an application scene requiring high-precision local dimming, accurate light control is difficult to realize. The existing backlight module generally uses a single light enhancement film or diffusion layer to optimize light, but because light can be refracted and scattered for many times when being transmitted inside the light guide plate, part of light can be lost due to overlarge refraction angle, so that the output efficiency of the light is reduced. In addition, the traditional backlight module can not fully optimize the combination mode of the optical film layers, so that light energy is wasted, and the brightness can not be effectively improved, thereby increasing the power consumption of the LED light source and being unfavorable for energy-saving design. Disclosure of Invention The invention aims to solve the defects in the prior art, provides a backlight module which has uniform brightness and can improve the display effect and the local dimming brightness, and provides a vehicle-mounted screen comprising the backlight module. In order to solve the technical problems, the invention discloses a backlight module capable of improving local dimming brightness, a lower iron frame is wrapped by a rubberizing frame to form a closed supporting structure, an LED lamp is fixed on a PCB (printed circuit board) in the lower iron frame, a light guide plate is positioned in front of the LED lamp and guides light, and a diffusion plate and a diffusion film cover the light guide plate in sequence to uniformly light; The front surface of the light guide plate is provided with a plurality of spherical bosses, and the spherical bosses enable light to be more uniformly diffused through refraction and condensation; The back of the light guide plate is provided with a plurality of spherical concave areas, so that the LED backlight source can be avoided, and light rays are secondarily focused. Further, a lower brightness enhancement film and an upper brightness enhancement film are sequentially arranged above the diffusion film. Further, the upper brightness enhancement film is also provided with a double brightness enhancement film. Further, the edge of the light guide plate is provided with a reflecting layer. Furthermore, the side wall of the light guide plate is provided with an inclined chamfer structure or a prismatic light guide structure for optimizing the propagation path of light in the light guide plate. Further, the LED lamp is mounted on the PCB. Further, the PCB is fixed on the lower iron frame through heat conduction double faced adhesive tape. Further, the curvature radius of the spherical boss is 1.5-4.0mm, and the curvature radius of the spherical inner groove is 2.0-6.0mm. The invention also discloses a vehicle-mounted screen, which comprises any backlight module capable of improving the local dimming brightness and a liquid crystal display panel, wherein the liquid crystal display panel is arranged on the light emitting side of the backlight module. Further, the vehicle-mounted screen further comprises a touch layer, and the touch layer is arranged in front of the liquid crystal display panel. The beneficial effects are that: 1. Compared with t