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OLED微显示像素驱动电路中,由于较小的存储电容和开关MOS管关态漏电流的影响,导致其存储电压和亮度不稳定。通过分析影响关态漏电流的主要因素,提出了一种多开关管串联和存储电容拆分相结合的办法以减小关态漏电流,并设计了一种含有两个开关管和两个存储电容的像素电路,该电路将关态漏电流由大于3pA减小为0.4pA,存储电压和亮度稳定性得到了很大的改善,小亮度时一帧的亮度变化仅为0.18cd/m~2。电路可实现的最小OLED驱动电流为25pA,像素亮度范围为1.82~217.37cd/m~2。
OLED microdisplay pixel driver circuit, due to the smaller storage capacitor and the impact of the switching MOS off-state leakage current, resulting in its storage voltage and brightness instability. By analyzing the main factors that affect the off-state leakage current, a multi-switch series and storage capacitor split method is proposed to reduce the off-state leakage current. A two-switch and two-storage Capacitance of the pixel circuit, the circuit will be the off-state leakage current from more than 3pA reduced to 0.4pA, the storage voltage and brightness stability has been greatly improved, a small brightness of the brightness change of only 0.18cd / m ~ 2 . The circuit can achieve a minimum OLED drive current of 25pA, pixel brightness range of 1.82 ~ 217.37cd / m ~ 2.