Search

CN-224232082-U - Backlight module and display device

CN224232082UCN 224232082 UCN224232082 UCN 224232082UCN-224232082-U

Abstract

The application provides a backlight module and a display device, wherein the backlight module comprises a light source component, a first liquid crystal screen and a color filter, wherein the light source component is used for emitting polarized light, the first liquid crystal screen is arranged on the light emitting side of the light source component, the first liquid crystal screen comprises a liquid crystal layer and the color filter, the liquid crystal layer is used for controlling the throughput of the polarized light, the color filter is arranged on the light emitting side of the liquid crystal layer, and the color filter comprises a red sub-filter area, a green sub-filter area and a blue sub-filter area so as to respectively form red light, green light and blue light, and the red light, the green light and the blue light are mixed to form backlight. The backlight module can inhibit thermal effect interference and eliminate mixed light cross color.

Inventors

  • YANG MINNA

Assignees

  • 深圳TCL新技术有限公司

Dates

Publication Date
20260512
Application Date
20250616

Claims (12)

  1. 1. A backlight module, comprising: The light source assembly is used for emitting polarized light; The light source comprises a light source component, a first liquid crystal screen, a first light source module and a second liquid crystal screen, wherein the first liquid crystal screen is arranged on the light emitting side of the light source component and comprises a liquid crystal layer and a color filter, the liquid crystal layer is used for controlling the throughput of polarized light, the color filter is arranged on the light emitting side of the liquid crystal layer, the color filter comprises a red sub-filter area, a green sub-filter area and a blue sub-filter area so as to respectively form red light, green light and blue light, and the red light, the green light and the blue light are mixed to form backlight.
  2. 2. A backlight module according to claim 1, wherein the light source assembly comprises a light emitting unit for emitting light source light and a polarization assembly disposed at a light emitting side of the light emitting unit for converting the light source light into polarized light.
  3. 3. The backlight module according to claim 2, wherein the light emitting unit is a blue light source, the polarization component comprises a polarization diffusion layer and a quantum dot layer, the polarization diffusion layer is disposed on the light emitting side of the light emitting unit, and the quantum dot layer is disposed on the light emitting side of the polarization diffusion layer.
  4. 4. A backlight module according to claim 3, wherein the light emitting unit is miniLED chips, or the light emitting unit comprises a blue LED and a lens disposed on the blue LED.
  5. 5. A backlight module according to claim 2, wherein the light emitting unit is a blue light source, and the polarizing component comprises a quantum dot polarizing diffusion plate disposed on a light emitting side of the blue light source.
  6. 6. A backlight module according to claim 2, wherein the polarization component comprises a polarization lens, the polarization lens being arranged at the light emitting side of the light emitting unit.
  7. 7. A backlight module according to claim 6, further comprising a light homogenizing layer disposed between the polarizing lens and the first liquid crystal screen for homogenizing the distribution of the polarized light.
  8. 8. A backlight module according to any one of claims 1 to 7, wherein the red, green and blue sub-filter regions are arranged in an array to form pixel-level illumination.
  9. 9. A backlight module according to any one of claims 1 to 7, further comprising a polarizer disposed on the light-emitting side of the first liquid crystal panel, wherein the polarization direction of the polarizer is perpendicular to the polarization direction of the polarized light.
  10. 10. A backlight module according to any one of claims 1 to 7, wherein the first liquid crystal panel further comprises a transparent packaging structure and a thin film transistor layer, the liquid crystal layer, the color filter and the thin film transistor layer are packaged in the transparent packaging structure, the thin film transistor layer is disposed on a side of the liquid crystal layer away from the color filter, and the thin film transistor layer is used for driving the liquid crystal layer.
  11. 11. A display device, comprising: A backlight module, the backlight module being the backlight module of any one of claims 1 to 10; The second liquid crystal screen is arranged on the light emitting side of the backlight module, and the polarization direction of the polaroid on the light entering side of the second liquid crystal screen is consistent with the polarization direction of the light emitted by the backlight module.
  12. 12. The display device of claim 11, wherein the red sub-filter region, the green sub-filter region, and the blue sub-filter region are arranged in an array such that the backlight module has a first resolution, the second liquid crystal panel has a second resolution, and the first resolution is less than or equal to the second resolution.

Description

Backlight module and display device Technical Field The present utility model relates to the field of display technologies, and in particular, to a backlight module and a display device. Background In the field of liquid crystal display backlight modules, a scheme of adopting red (R), green (G) and blue (B) three-color LEDs (LIGHT EMITTING Diode) as a light source is widely used because of wide color gamut coverage and controllable cost. However, the characteristics of the LED device and the optical design of the backlight module are limited, and there are two technical bottlenecks in practical application, namely, temperature-induced brightness attenuation and color shift, and cross color problem in mixed light display. On the one hand, the luminous efficiency and color coordinates of LEDs are highly sensitive to junction temperature. The brightness attenuation rates of the R/G/B three-color LEDs at high temperature are remarkably different (for example, the attenuation amplitude of the red LEDs is higher than that of the red LEDs), and the color coordinate offset directions are inconsistent, so that the color temperature of the mixed white light fluctuates. In addition, uneven distribution of heating elements in the backlight module causes display plane temperature difference, and local chromaticity deviation is aggravated. The existing dynamic compensation scheme depends on a high-density temperature sensor and a high-power chip, but the hardware cost is correspondingly increased, and the requirement of consumer products on cost performance is difficult to meet due to the need of additional compensation chips. On the other hand, due to the difference between the LED package size and the subpixel size of the liquid crystal screen, the backlight mixing area is overlapped, resulting in color penetration of adjacent pixels. When displaying light and dark adjacent images (such as white and red), the light areas are degraded in color purity due to stray light mixed into the LEDs of other colors, and subjective vision is represented as color cast. The existing scheme can only partially alleviate the problem by optimizing the driving algorithm, can not fundamentally eliminate the cross color phenomenon, and needs to be innovated from the optical architecture level. The above problems directly lead to reduced uniformity of the display screen and color reduction distortion, and become key factors for restricting the improvement of the performance of the display product. Disclosure of utility model The embodiment of the application provides a backlight module and a display device, which can inhibit thermal effect interference and eliminate mixed light cross color. The embodiment of the application provides a backlight module, which comprises: The light source assembly is used for emitting polarized light; The light source comprises a light source component, a first liquid crystal screen, a first light source module and a second liquid crystal screen, wherein the first liquid crystal screen is arranged on the light emitting side of the light source component and comprises a liquid crystal layer and a color filter, the liquid crystal layer is used for controlling the throughput of polarized light, the color filter is arranged on the light emitting side of the liquid crystal layer, the color filter comprises a red sub-filter area, a green sub-filter area and a blue sub-filter area so as to respectively form red light, green light and blue light, and the red light, the green light and the blue light are mixed to form backlight. In some embodiments, the light source assembly includes a light emitting unit for emitting light source light and a polarization assembly disposed at a light emitting side of the light emitting unit for converting the light source light into polarized light. In some embodiments, the light emitting unit is a blue light source, and the polarization component includes a polarization diffusion layer and a quantum dot layer, wherein the polarization diffusion layer is disposed on a light emitting side of the light emitting unit, and the quantum dot layer is disposed on the light emitting side of the polarization diffusion layer. In some embodiments, the light emitting unit is miniLED chips, or the light emitting unit includes a blue LED and a lens disposed over the blue LED. In some embodiments, the light emitting unit is a blue light source, and the polarizing component includes a quantum dot polarizing diffuser plate disposed on a light emitting side of the blue light source. In some embodiments, the polarizing assembly includes a polarizing lens disposed at the light emitting side of the light emitting unit. In some embodiments, the backlight module further includes a light homogenizing layer, where the light homogenizing layer is disposed between the polarizing lens and the first liquid crystal screen, and is used for homogenizing the distribution of the polarized light. In some embodiments, the