EL Display Data Driver Voltage Pre-Charging for Gray Level Accuracy

The patent applies voltage signals to pixel cells before applying current signals. This preliminary voltage application pre-charges the storage capacitors in the pixel cells, ensuring they have sufficient voltage to accurately convert subsequent current signals into the desired gray levels. The timing controller coordinates this two-stage process by first activating voltage signal application, then current signal application, thereby resolving the contradiction between structural simplicity and gray level accuracy.

The timing controller in the patent performs multiple functions: it controls the sequence of voltage signal application, coordinates current signal application, and manages the overall timing synchronization between different signal types. By making the timing controller a multi-functional component that handles both voltage and current signal coordination, the patent achieves improved gray level accuracy without proportionally increasing overall device complexity, as the same controller unit manages multiple tasks.

The patent implements a two-stage driving approach where voltage signals are applied first to pre-charge the storage capacitors, followed by current signals for image display. This preliminary voltage charging action ensures that storage capacitors have sufficient voltage headroom to accurately convert current signals into desired gray levels, thereby improving capacitor charging capability without significantly complicating the driving circuit, as the same data driver can sequence both signal types.