Voltage Compensation for AMOLED Residual Image Reduction

The voltage transition is segmented into multiple intermediate steps rather than a single direct switch. The method divides the voltage change from first voltage to second voltage into multiple stages, with each stage having a compensated driving voltage that gradually approaches the target voltage. This segmentation allows the TFT to adapt to each voltage level, reducing hysteresis effects and preventing residual images while maintaining reasonable switching speed.

The method performs preliminary voltage compensation calculations before the actual voltage switching occurs. By determining the threshold voltage separation amount through forward and reverse scans of the current-voltage curve, and pre-calculating the compensated driving voltages for each intermediate step, the system prepares the optimal voltage transition path in advance. This preliminary action ensures that when voltage switching occurs, it follows a pre-optimized path that minimizes hysteresis effects.

The method applies partial voltage compensation rather than full gradual adjustment. Instead of using numerous intermediate frames, it determines a threshold voltage separation amount and applies compensated driving voltages at strategically selected intermediate steps. This partial action approach achieves sufficient hysteresis reduction without requiring excessive intermediate frames, thus balancing display uniformity with acceptable switching time.

The method dynamically changes the driving voltage parameter through a calculated sequence of compensated values. By determining the threshold voltage separation amount and using it to calculate compensated driving voltages for intermediate steps, the system optimizes the voltage transition parameters. This allows the voltage to change in a controlled manner that reduces hysteresis while minimizing the number of intermediate frames required.