分析了a-Si:H-TFT阈值电压漂移的机理,即分析了栅偏应力下电荷注入到SiNx:H栅绝缘层和a-Si:H中亚稳态的产生对TFT阈值电压漂移的影响.根据非晶硅中亚稳态产生的特点,并针对驱动OLED的两管a-Si:H-TFT像素电路,提出了一种通过对数据信号时序的重新设计来补偿阈值电压漂移的方法,即在数据信号间加插一个与数据信号极性相反的补偿信号.通过这种正负交替的信号,使驱动管TFT中由亚稳态造成的阈值电压漂移始终保持在一个动态平衡的过程,来实现驱动OLED电流稳定的目的.
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