Liquid Crystal Driving Circuit Charge Neutralization

Before switching the voltage polarity at the pixel electrode, the circuit first performs a preliminary action by neutralizing charges through the charge sharing circuit. This preliminary charge neutralization prepares the pixel electrode for faster subsequent voltage switching, as the starting voltage is already close to the reference voltage rather than requiring charging from a large voltage span.

The voltage switching process is segmented into two distinct phases: (1) charge sharing phase where charges are neutralized to near reference voltage through controlled switching of the charge sharing circuit, and (2) voltage polarity switching phase where the actual display voltage is applied. This segmentation allows each phase to be optimized independently, resolving the contradiction between charging time and switching speed.

The charge sharing circuit utilizes existing components in the display driver circuitry, such as the liquid crystal capacitor and existing switch tubes, to perform the additional charge sharing function. By making existing components multi-functional, the circuit achieves improved charging time without proportionally increasing device complexity.

The charge sharing function is merged with the existing voltage switching circuitry. The same switch tubes and capacitors that perform voltage switching also perform charge sharing by controlling their switching timing and configuration. This merging approach allows the circuit to achieve dual functionality without adding separate dedicated charge sharing components.