Common Electrode Pattern for Display Flickering Reduction
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Solution Overview
Problem
Frame synchronization technologies in display equipment lead to varying vertical blank intervals and pixel potential reductions at different refresh frequencies, causing inconsistent screen brightness and potential screen flickering.
Innovation Solution
A common electrode pattern with two units, one for positive-polarity and one for negative-polarity pixels, adjusts common voltages during vertical blank intervals to maintain pixel potential differences within a preset range, ensuring consistent screen brightness across different refresh frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame synchronization technology is used to synchronize display refresh frequency with graphics card frame rate, then screen tearing is avoided, but pixel potential reduction varies at different refresh frequencies causing screen brightness inconsistency and flickering
Solution Approach 1:
The common electrode is divided into multiple independent common electrode units (first common electrode unit and second common electrode unit), each controlling common voltage for specific pixel groups. This segmentation allows independent voltage adjustment for different pixel regions, enabling compensation of potential reduction variations across the display at different refresh frequencies.
Solution Approach 2:
The patent dynamically adjusts the common voltage parameter applied to pixels during vertical blank intervals based on refresh frequency. By changing the common voltage level in response to different refresh rates, the system compensates for varying potential reduction effects, maintaining consistent pixel potential and screen brightness across different operating conditions.
2Adaptability or versatility
If vertical blank interval is prolonged to synchronize refresh frequency, then frame rate synchronization is achieved, but pixel potential leakage increases causing brightness variation
Solution Approach 1:
The system performs preliminary compensation by adjusting the common voltage during the vertical blank interval before the next frame is displayed. This preliminary action counteracts the potential leakage that will occur during the extended blank interval, ensuring that pixel potential is restored to the appropriate level before display begins, thus preventing brightness variation.
Solution Approach 2:
The patent implements a feedback mechanism where the display controller monitors the refresh frequency and vertical blank interval duration, then adjusts the common voltage accordingly. This closed-loop control ensures that as the vertical blank interval changes with different refresh rates, the common voltage is optimized to compensate for the corresponding potential leakage, maintaining stable pixel potential.
Data Source
AI summary
A common electrode pattern, a driving method and a display equipment. By performing common voltage compensations for all positive-polarity pixels and all negative-polarity pixels through two common electrode units, respectively, the difference between the reduction degrees of the pixel potential of the display equipment at different refresh frequencies can be effectively reduced, so that the brightness of the screen displayed by the display equipment at different refresh frequencies tend to be consistent, thereby improving the phenomenon of screen flickering.