OLED Timing Controller Resynchronization for Phase Mismatch
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Solution Overview
Problem
In OLED display devices, the phase mismatch between the vertical synchronization signals generated by the display chip and the timing controller leads to a maximum buffer delay, affecting the quick response time, such as when pressing a button, due to the panel self-refresh mode transitioning back to vertical synchronization mode.
Innovation Solution
A display driving device with a timing controller that adjusts the delay time between the second scanning signal and the buffer signal, either decreasing to zero or increasing to the duration of one frame period, to resynchronize the vertical synchronization signals, using equations Tphase1=Td1*m*TH*TF and Tphase2=(TF-Td1)*n*TH to adjust the delay time based on preset synchronization cycles, thereby reducing phase mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the panel self-refresh mode transitions back to vertical synchronization mode, then the vertical synchronization signals can be resynchronized, but a maximum buffer delay occurs affecting quick response time
Solution Approach 1:
The timing controller performs preliminary actions by adjusting the delay time of the second scanning signal before the phase mismatch becomes critical. When transitioning from self-refresh mode to vertical synchronization mode, the controller proactively modifies the delay time according to the buffer signal timing, preventing maximum buffer delay from occurring and maintaining quick response time while ensuring proper synchronization.
2Reliability
If the delay time between the second scanning signal and the buffer signal is adjusted, then the phase mismatch is reduced, but the timing controller complexity increases
Solution Approach 1:
The timing controller implements a feedback mechanism where it continuously monitors the delay time between the second scanning signal and the buffer signal. Based on this feedback, the controller automatically adjusts the delay time to reduce phase mismatch. This closed-loop control approach achieves reliable synchronization while keeping the control logic systematic and manageable, rather than requiring complex ad-hoc adjustments.
Data Source
AI summary
The present disclosure provides a display driving device, method and an OLED display device, and the display driving device includes: an interface module, configured to receive image data of a display chip and sending a first scanning signal in each of frame periods; a frame buffer, configured to send a buffer signal after receiving the first scanning signal from the interface module; a timing controller, configured to send a second scanning signal to the display panel according to the buffer signal sent by the frame buffer; in response to the display driving device is switched from a screen self-refresh mode to a vertical synchronization mode, the delay time between the second scanning signal and the buffer signal gradually decreases, one frame period by one frame period, to zero or gradually increases, one frame period by one frame period, to duration of one frame period. When the display device is switched back to the vertical synchronization mode, the present disclosure causes the vertical synchronization signal generated by the display chip and the timing controller to be resynchronized for reducing phase mismatch, thereby improving display response speed of the display device.