Shift Register Circuit Black Image Insertion for OLED Smear

The patent applies preliminary action by inserting a black image frame between consecutive color image frames before the actual display. The shift register circuit generates scanning signals that activate the display apparatus in a specific sequence: first displaying a black image, then transitioning to the color image. This preliminary black image insertion allows the light-emitting elements to be fully turned off before the next color image is displayed, eliminating dynamic image smear by ensuring complete light emission cessation between frames.

The patent applies universality by designing the shift register circuit to perform multiple functions using the same basic components. The shift register circuit generates scanning signals for both the black image insertion process and the subsequent color image display. The same shift register stages, timing control units, and voltage boosting circuits are utilized to control both the black frame insertion timing and the color image scanning, eliminating the need for separate dedicated circuits for each function and thus minimizing the increase in device complexity.

The patent applies feedback by implementing a timing control unit that receives feedback signals from the shift register circuit and adjusts the scanning signal generation accordingly. The timing control unit monitors the state of the shift register stages and dynamically controls the timing of scanning signals to ensure proper synchronization between the black image insertion and color image display phases. This feedback mechanism maintains ease of operation by automating the complex timing coordination, while ensuring reliable image quality by preventing any overlap between black and color image display periods.