US Patent No. 11,032,886

LIGHT EMITTING DIODE DRIVER AND DRIVING METHOD THEREOF


Patent No. 11,032,886
Issue Date June 08, 2021
Title Light Emitting Diode Driver And Driving Method Thereof
Inventorship Tuo-Kuang Chen, Hsinchu (TW)
Hsiang-Yi Chiu, New Taipei (TW)
Chiun-He Lin, Pingtung County (TW)
Yao-Cheng Lin, Hsinchu County (TW)
Assignee Novatek Microelectronics Corp., Hsinchu (TW)

Claim of US Patent No. 11,032,886

1. A light emitting diode (LED) driver, comprising:a brightness code calculation circuit, configured to receive a pulse width modulation (PWM) signal and perform a calculation operation comprising calculating a duty cycle of the PWM signal with respect to a period of the PWM signal and generating a brightness code according to the duty cycle of the PWM signal; a driving current generation circuit, coupled to the brightness code calculation circuit, and configured to generate a driving current according to the brightness code; and
a control circuit, coupled to the brightness code calculation circuit, and configured to detect a plurality of brightness codes generated by the brightness code calculation circuit repeatedly performing the calculation operation and determine whether or not to adjust an execution frequency of the calculation operation of the brightness code calculation circuit according to the plurality of brightness codes.