US 12,223,884 B2
LED driving circuit and its driving method
Sang Suk Kim, Daejeon (KR); Jang Su Kim, Daejeon (KR); Ji Hwan Kim, Daejeon (KR); Jong Min Lee, Daejeon (KR); and Kyeong Rok Lee, Daejeon (KR)
Assigned to LX SEMICON CO., LTD., Daejeon (KR)
Filed by LX Semicon Co., Ltd., Daejeon (KR)
Filed on Mar. 31, 2023, as Appl. No. 18/193,808.
Claims priority of application No. 10-2022-0041133 (KR), filed on Apr. 1, 2022; and application No. 10-2022-0092977 (KR), filed on Jul. 27, 2022.
Prior Publication US 2023/0316993 A1, Oct. 5, 2023
Int. Cl. G09G 3/32 (2016.01)
CPC G09G 3/32 (2013.01) [G09G 2320/0247 (2013.01); G09G 2320/0633 (2013.01); G09G 2340/0407 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An LED driving circuit comprising:
a current channel electrically connected to a light emitting diode and configured to deliver driving current of the light emitting diode;
a dimming control circuit configured to control the driving current of the light emitting diode according to a duty ratio of a pulse width modulation (PWM) driving control signal; and
a register configured to store the indicator of a multiplier frequency corresponding to the PWM driving control signal,
wherein a frequency of the PWM driving control signal is determined based on a reference clock signal and the multiplier frequency.