关键词: LED驱动芯片, SPWM算法, 均匀度, 刷新率

Abstract: LED driver chips can output high level of grayscale and they are widely used in fine pitch LED to display more exquisite and contrastive images. The SPWM algorithm is usually used to deal with high grayscale images, but there are some defects when the grayscale is low and the evenness of the image is poor. This paper proposes "optimization of distributing the low gray data" and "optimization of subcycle" to solve the problems of poor performance in low gray data and insufficient refresh rate in the situation of multi-row sweep, they are based on SPWM algorithm. The optimized algorithm is implemented with hardware description language and it has been simulated and verified. The evenness of output waveform increases a lot in the situation of low grayscale, and the refresh rate may increase more than2 times.

Key words: LED driver chip, SPWM algorithm, evenness, refresh rate