A 2.2″ QVGA a‐Si TFT‐LCD with a novel integrated gate driver has been developed. High reliability is achieved by assigning pull‐down and retention processes to two individual TFTs and by stabilizing the gate voltages of the pull‐up TFTs. The developed LCD shows sufficient performance even at −35°C after a 5000hour operation test at 55°C.
We have developed driving technology to reduce the power consumption of TFT-LCDs which display information using 8 colors on a partial screen area in the standby mode of cellular phones. We propose that the LCD be driven at low frame frequency and that more unnecessary circuits be stopped intermittently when driving the LCD. We reduce flicker by making the optical response waveform for a frame like a simple pulse and by having the same waveform in the positive and negative frames.
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