Driving Method Study and its Implementation for TFT-LCD with High Gray Scale

摘要

This paper presents an efficient pulse width modulation (EPWM) drive method, which is used to implement the driving controller for TFT-LCD with high gray scale. To solve the time redundancy issues in the traditional pulse width modulation (TPWM) drive method, the proposed method divides the display panel into several sub-partitions and scans the sub-partitions alternately, and the gray data and vanishing signals are transmitted with separate wires in driving controllers. It's theoretically proved that the drive efficiency can achieve 100% for any gray scale display systems with EPWM, and the implementation also shows that, comparing with the TPWM method, the minimum clock frequency in the TFT-LCD systems can greatly reduced with the proposed method.