US 12,340,769 B2
Backlight module and driving method thereof, and displaying module
Guojian Qu, Beijing (CN); Yangyang Cai, Beijing (CN); Qiaoke Zhou, Beijing (CN); Yawei Chen, Beijing (CN); Jing Wang, Beijing (CN); Tanhong Zhao, Beijing (CN); and Gang Li, Beijing (CN)
Assigned to BEIJING BOE DISPLAY TECHNOLOGY CO., LTD., Beijing (CN); and BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Appl. No. 18/021,920
Filed by Beijing BOE Display Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Mar. 31, 2022, PCT No. PCT/CN2022/084527
§ 371(c)(1), (2) Date Feb. 17, 2023,
PCT Pub. No. WO2023/184387, PCT Pub. Date Oct. 5, 2023.
Prior Publication US 2024/0274097 A1, Aug. 15, 2024
Int. Cl. G09G 3/34 (2006.01); F21V 8/00 (2006.01); G02F 1/13357 (2006.01)
CPC G09G 3/3426 (2013.01) [G02B 6/0068 (2013.01); G02F 1/133609 (2013.01); G09G 3/3413 (2013.01); G09G 3/342 (2013.01); G02F 1/133603 (2013.01); G09G 2320/0242 (2013.01); G09G 2320/041 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A backlight module, wherein the backlight module is applied to a displaying module;
the backlight module comprises a backlight source and a backlight driving unit;
the backlight source comprises a white-light source and a compensating light source, an exiting-light-wavelength range of the white-light source is a first wavelength range, and an exiting-light-wavelength range of the compensating light source is a second wavelength range, wherein the second wavelength range is within the first wavelength range;
the backlight driving unit comprises a primary driving module and a compensating driving module, wherein the primary driving module is a System on Chip, the compensating driving module is a compensating driving chip, and the compensating driving chip is a single chip microcomputer, an Advanced RISC Machine or a Field Programmable Gate Array;
the primary driving module is electrically connected to the white-light source and the compensating driving module, and is configured for, within a compensation time duration, according to a current environmental temperature, selecting a compensation-driving function corresponding to the current environmental temperature, wherein the compensation time duration refers to a time duration from an initial starting-up moment of the displaying module to a thermal-equilibrium moment, and the compensation-driving function contains a correspondence relation between driving currents of the compensating light source and environmental temperatures; and according to the selected compensation-driving function, supplying a compensation controlling signal to the compensating driving module;
the compensating driving module is configured for acquiring the compensation controlling signal, and according to the compensation controlling signal, supplying a driving signal to the compensating light source; and
the compensating light source is configured for acquiring the driving signal, and emitting light when driven by the driving signal, whereby a variation value of a white-dot chromaticity coordinate of the displaying module within the compensation time duration is within a preset range;
wherein a working efficiency η of the compensating light source satisfies:

OG Complex Work Unit Math
wherein t represents a duration, Tw is a thermal-equilibrium duration of the displaying module, and A is a module impact factor.