US 12,356,521 B2
Brightness control device and brightness control method
Kai-Ju Cheng, Taoyuan (TW); Huan-Pin Shen, Taoyuan (TW); Huan-Tang Wu, Taoyuan (TW); and Chin-Kang Chang, Taoyuan (TW)
Assigned to QUANTA COMPUTER INC., Taoyuan (TW)
Filed by Quanta Computer Inc., Taoyuan (TW)
Filed on Apr. 13, 2023, as Appl. No. 18/299,863.
Claims priority of application No. 112105951 (TW), filed on Feb. 18, 2023.
Prior Publication US 2024/0284570 A1, Aug. 22, 2024
Int. Cl. H05B 45/325 (2020.01); H05B 45/10 (2020.01)
CPC H05B 45/325 (2020.01) [H05B 45/10 (2020.01)] 4 Claims
OG exemplary drawing
 
1. A brightness control device for controlling light-emitting diodes (LEDs) during a video recording performed by an image sensor, comprising:
a pulse width modulation (PWM) signal output unit configured to provide at least one PWM signal; and
a brightness control signal generation unit configured to generate a brightness control signal according to an exposure signal of the image sensor and the at least one PWM signal;
wherein in response to the exposure signal being active, the image sensor generates a frame; and in response to the exposure signal being inactive, the image sensor generates no frame;
wherein the at least one PWM signal comprises a high duty-ratio PWM signal and a low duty-ratio PWM signal, the brightness control signal generation unit comprises an AND gate and an OR gate, the exposure signal, along with the high duty-ratio PWM signal, are inputs of the AND gate, and an output of the AND gate, along with the low duty-ratio PWM signal, are inputs of the OR gate, and an output of the OR gate is the brightness control signal.