Driving principle of TFT LCD liquid crystal display part one

The first two issues introduced the basic principles of liquid crystal display operation based on the characteristics of liquid crystal and the structure of TFT LCD itself. This time we will focus on the overall system aspect of TFT LCD, that is, its driving principle, which is still different due to some architectural differences. First, we will introduce the principles of different drive system architectures due to different Cs (storage capacitor) storage capacitor structures.

Cs (storage capacitor) structure of storage capacitor

Generally, there are two most common storage capacitor structures, namely Cs on gate and Cs on common. As the name suggests, the main difference between the two is that the storage capacitor is implemented using gate traces or common traces. As mentioned in the previous article, the storage capacitor is mainly used to maintain the charged voltage until the next time the screen is updated. Therefore, it must be like in the CMOS process, using different layers of wiring. forms a parallel plate capacitor. In the TFT LCD 7 segment manufacturing process, the storage capacitor Cs is produced using the parallel plate capacitance formed by the display electrode and the gate trace or common trace.