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提出了一种新颖的16bit脉宽调制(PWM)平均分割调光算法,其映射电路满足LED光亮度在0～100%间精细调光。该算法将整个PWM周期均分为多个小的灰度周期,同时对灰度数据权值位进行分割处理,以克服高权值位对灰度均匀性的影响,提高了灰阶亮度的视觉刷新率,且有效消除低亮度时的闪烁问题。采用HSIM对整体电路进行了仿真验证,结果表明,PWM输出波形具有良好的均匀性。基于TSMC0.6μm BCD工艺实现的调光电路有效芯片面积小于0.3mm2,对采用本设计的一款RGBLED驱动芯片进行流片、测试,验证了该调光电路能够正常工作。
A novel 16bit pulse width modulation (PWM) average division dimming algorithm is proposed. Its mapping circuit can meet the requirements of LED brightness finely adjusted from 0% to 100%. The algorithm divides the whole PWM period into multiple small gray periods, and at the same time divides the weighted bits of the gray data to overcome the influence of the high-weight bits on the gray evenness and improves the gray-scale brightness of the visual Refresh rate, and effectively eliminate the flicker problem of low brightness. The whole circuit is verified by HSIM. The results show that the PWM output waveform has good uniformity. Based on TSMC 0.6μm BCD technology dimming circuit chip area is less than effective 0.3mm2, the use of this design a RGBLED driver chip streaming, testing, verify the dimming circuit to work properly.