US 11,756,491 B2
Display device driving method for improving contrast of liquid crystal display panel
Xin Zhang, Shenzhen (CN); and Tao He, Shenzhen (CN)
Appl. No. 16/982,598
Filed by TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Shenzhen (CN)
PCT Filed May 18, 2020, PCT No. PCT/CN2020/090782
§ 371(c)(1), (2) Date Sep. 21, 2020,
PCT Pub. No. WO2021/217744, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 202010348523.0 (CN), filed on Apr. 28, 2020.
Prior Publication US 2023/0106250 A1, Apr. 6, 2023
Int. Cl. G09G 3/34 (2006.01); G09G 3/36 (2006.01)
CPC G09G 3/342 (2013.01) [G09G 3/3696 (2013.01); G09G 2320/0646 (2013.01); G09G 2320/0673 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A display device driving method, wherein a display device comprises a backlight module, a liquid crystal display panel, and a main control chip, the backlight module comprises a first driver chip, the liquid crystal display panel comprises a second driver chip; a backlight source of the backlight module comprises a plurality of backlight units arranged in an array and driver circuits corresponding to the backlight units, the liquid crystal display panel comprises a plurality of display units arranged in an array, each of the display units comprises a plurality of pixels, the backlight units correspond to the display units, and the display device driving method comprises:
by the main control chip, obtaining a brightness datum of each of the pixels of target display units when a target display frame is displayed, determining target brightness values of target backlight units corresponding to the target display units when the target display frame is displayed according to the brightness datum of each of the pixels in the target display units, determining first bit width drive voltage values of the target backlight units when the target display frame is displayed according to the target brightness values of the target backlight units corresponding to the target display units when the target display frame is displayed, determining second bit width drive voltage values of the target backlight units when the target display frame is displayed according to a drive voltage conversion relationship table between the first bit width drive voltage values and the second bit width drive voltage values based on the brightness values, and transmitting the second bit width drive voltage values to the first driver chip;
by the main control chip, determining a drive voltage value of each of the pixels in the target display units when the target display frame is displayed according to the brightness datum of each of the pixels in the target display units when the target display frame is displayed, and transmitting the drive voltage value to the second driver chip;
by the first driver chip, driving each of the backlight units of the backlight module to emit light according to the second bit width drive voltage values of the target backlight units when the target display frame is displayed; and
by the second driver chip, driving the pixels of each of the display units in the liquid crystal display panel to transmit light according to the drive voltage value of each of the pixels in the target display units when the target display frame is displayed;
wherein a step of determining the second bit width drive voltage values of the target backlight units when the target display frame is displayed according to the drive voltage conversion relationship table between the first bit width drive voltage values and the second bit width drive voltage values based on the brightness values, comprises:
calling the drive voltage conversion relationship table; and
converting the first bit width drive voltage values of target backlight units when the target display frame is displayed into the second bit width drive voltage values of the target backlight units when the target display frame is displayed according to a correspondence between the first bit width drive voltage values and the second bit width drive voltage values in the drive voltage conversion relationship table;
wherein before a step of calling the drive voltage conversion relationship table, the method further comprises:
obtaining a correspondence between light emission brightness values of the backlight units and the second bit width drive voltage values;
obtaining a gamma curve, wherein the gamma curve comprises a corresponding variation curve of the first bit width drive voltage values to the brightness values; and
generating the drive voltage conversion relationship table based on the brightness values according to the gamma curve and the correspondence between the light emission brightness values and the second bit width drive voltage values of the backlight units.