P‐7.2: Study on the gray‐scale flicker mechanism and improvement methods of LTPS ADS products

Abstract

In this paper, the Gray 127 jitter mechanism and improvement method are researched after electrostatic accumulation of advanced super‐dimension switch (ADS) mode products of low‐temperature poly‐silicon (LTPS) based on the flexural electrical effect. Firstly, the Gary 127 jitter mechanism of module in FOG state is explored through the abnormally powering down to accumulate electrostatic. Then, the mechanism of Flicker pattern drift and Gary jitter is further explained after the static electricity is eliminated through heating and standing. Finally, the jitter of Gary 127 is improved by adjusting the dose of Vth doping. The test results show that the degree of the Panel Gary 127 jitter is affected by the value of pixel CST capacitance after the CELL ET is powered down abnormally. At the same time, the degree of gray‐scale jitter is weakened but can not be completely eliminated after the panel is standing under the normal temperature for 48h. With the high temperature of 80 °C aging 1H, the gray‐scale jitter can be significantly reduced. However, at this time, flicker pattern has serious drift phenomenon. Finally, the influence of changing the dose of Vth doping on the degree of the Panel Gary 127 jitter is verified under the condition of CST unchanged. The results show that the degree of the Panel Gary 127 jitter can be substantially weaken by decreasing the dose of Vth less than 5E12(ions/cm2). According to the above verification, it can be concluded that ADS mode product of LTPS is prone to gray 127 jitter on the state of abnormally powering down. And this phenomenon can be weaken through standing and heating for a while. More specifically, static electricity can be released by decreasing the value of CST capacitance and the dose of Vth doping.