US 12,405,499 B2
LCD display having increased contrast structure, and display device
Guangyue Luo, Guangdong (CN); Jie Luo, Guangdong (CN); and Yunguo Zhao, Guangdong (CN)
Assigned to Huizhou TCL Cloud Internet Corporation Technology Co., Ltd., Guangdong (CN)
Appl. No. 18/575,403
Filed by Huizhou TCL Cloud Internet Corporation Technology Co., Ltd., Guangdong (CN)
PCT Filed May 6, 2022, PCT No. PCT/CN2022/091271
§ 371(c)(1), (2) Date Dec. 29, 2023,
PCT Pub. No. WO2023/000761, PCT Pub. Date Jan. 26, 2023.
Claims priority of application No. 202110835169.9 (CN), filed on Jul. 23, 2021.
Prior Publication US 2024/0310673 A1, Sep. 19, 2024
Int. Cl. G02F 1/13357 (2006.01); G02F 1/1335 (2006.01); G02F 1/1347 (2006.01); G02F 1/1368 (2006.01)
CPC G02F 1/133606 (2013.01) [G02F 1/133514 (2013.01); G02F 1/133528 (2013.01); G02F 1/1347 (2013.01); G02F 1/1368 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A liquid crystal display (LCD) display having a structure for increasing contrast, comprising:
a backlight layer configured to emit light;
a backlight control layer configured to filter the light emitted by the backlight layer; and
a light display layer provided with a light display surface for displaying visible light filtered by the backlight control layer;
wherein the backlight layer, the backlight control layer, and the light display layer are connected sequentially;
wherein the backlight control layer comprises a first glass substrate, the first glass substrate comprises a first lower glass substrate and a first upper glass substrate stacked with the first lower glass substrate;
wherein the light display layer comprises a second polarizer connected to the first upper glass substrate and configured to filter the light passing through the first upper glass substrate;
wherein the light display layer comprises a second glass substrate stacked with the second polarizer, the second glass substrate comprises a second upper glass substrate; and a second lower glass substrate stacked with the second upper glass substrate and connected to the second polarizer;
wherein by disposing the backlight control layer between the backlight layer and the light display layer, the backlight control layer is configured to perform a pixel-level filtering control on a transmission of the light, so as to block the light of a black area of the light display layer, such that the light reaching the light display layer is prevented from passing through the light display surface, the light passing through the first lower glass substrate is twisted, and an area defined by a twisted light and a polarization direction of the second polarizer is a dark area of a picture;
wherein a pixel point structure for controlling one or more light pixels is provided in the first upper glass substrate, the pixel point structure is one or more control pixels that constitute a smallest unit of the backlight control layer, the light display layer further comprises a grid layer for preventing pixels from mixing colors and disposed within the second upper glass substrate, and the grid layer is a black grid;
wherein the backlight control layer is configured as a dual LCD overlay structure, with the lower LCD layer serving as the backlight control layer to perform pixel-level control on transmission of light rays, blocking the backlight in dark areas of the light display layer to a minimum brightness, while the upper LCD layer is configured as the light display layer to operate pixels, allowing light in bright areas to pass;
wherein the first glass substrate comprises a first lower glass substrate and a first upper glass substrate, with a liquid crystal layer disposed between them, and the polarization angle of the light can be twisted by the liquid crystal layer;
wherein the light display layer further comprises a third polarizer for displaying visible light, and the second upper glass substrate is a color filter, while the second lower glass substrate is an array of thin-film field effect transistors.