US 11,839,006 B2
Backlight control circuit, method for driving the same, backlight module and display apparatus
Jie Yu, Beijing (CN); Pengtao Li, Beijing (CN); Yangyang Zhang, Beijing (CN); Daekeun Yoon, Beijing (CN); Qing Ma, Beijing (CN); and Rui Han, Beijing (CN)
Assigned to Beijing BOE Optoelectronics Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 16/979,561
Filed by Beijing BOE Optoelectronics Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Nov. 22, 2019, PCT No. PCT/CN2019/120324
§ 371(c)(1), (2) Date Sep. 10, 2020,
PCT Pub. No. WO2021/097813, PCT Pub. Date May 27, 2021.
Prior Publication US 2023/0099048 A1, Mar. 30, 2023
Int. Cl. H05B 47/20 (2020.01); G09G 3/36 (2006.01); G02F 1/133 (2006.01); G02F 1/13357 (2006.01)
CPC H05B 47/20 (2020.01) [G02F 1/1336 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A backlight control circuit, comprising:
an undervoltage protection circuit, electrically connected with a power supply voltage input end and a ground separately; wherein the undervoltage protection circuit is configured to output a closing control signal through an output end of the undervoltage protection circuit according to a voltage at the power supply voltage input end and an undervoltage threshold value; and
a backlight driving circuit, electrically connected with a voltage supply end, a backlight driving output end and the output end of the undervoltage protection circuit separately; wherein the backlight driving circuit is configured to stop working when receiving the closing control signal;
wherein the undervoltage protection circuit comprises:
a voltage dividing circuit, electrically connected with the power supply voltage input end and the ground separately, wherein the voltage dividing circuit is configured to divide a voltage between the power supply voltage input end and the ground and output the divided voltage through an output end of the voltage dividing circuit; and
an undervoltage control circuit, electrically connected with the output end of the voltage dividing circuit and the ground separately, wherein the undervoltage control circuit is configured to output a signal at the ground as the closing control signal through the output end of the undervoltage protection circuit when the divided voltage output by the output end of the voltage dividing circuit is lower than the undervoltage threshold value.