Display Device Common Voltage Adjustment for Flicker Reduction
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Solution Overview
Problem
Display devices experience screen tearing and flicker phenomena due to differences in refresh frequencies, causing inconsistent pixel potential decreases and image brightness variations.
Innovation Solution
A method that adjusts the common voltage of pixels during vertical blank intervals to maintain a preset voltage difference range between reference and current frames, ensuring consistent pixel potential decreases and reduced flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refresh frequency of the display device is adjusted to synchronize with the graphics card frame frequency to avoid screen tearing, then screen tearing is avoided, but the vertical blank interval changes causing different pixel potential decreases and image brightness variations occur
Solution Approach 1:
The patent adjusts the common voltage parameter of pixels during the vertical blank interval based on the actual refresh frequency. By dynamically changing the common voltage level, the patent compensates for the varying pixel potential decreases that occur at different refresh frequencies, thereby maintaining consistent image brightness while allowing refresh frequency adjustment to avoid screen tearing
Solution Approach 2:
The patent implements a feedback mechanism where the actual refresh frequency is detected and used to determine the appropriate common voltage adjustment. The system continuously monitors the refresh frequency, compares it with the standard frequency, and adjusts the common voltage accordingly to maintain consistent pixel potential decreases and image brightness across different refresh frequencies
2Speed
If the vertical blank interval is prolonged to reduce refresh frequency and synchronize with graphics card, then refresh frequency synchronization is achieved, but pixel potential decreases differently causing screen flicker
Solution Approach 1:
The patent dynamically adjusts the common voltage parameter based on the actual refresh frequency and vertical blank interval duration. By changing the common voltage level in response to varying blank interval lengths, the patent maintains consistent pixel potential decreases even when the vertical blank interval is prolonged for refresh frequency synchronization, thereby preventing screen flicker
Solution Approach 2:
The patent introduces dynamic adjustment of the common voltage during the vertical blank interval rather than using a fixed voltage level. This dynamic approach allows the system to adapt to varying blank interval durations caused by different refresh frequencies, ensuring that pixel potential decreases remain consistent regardless of the specific timing conditions
Data Source
AI summary
A method for driving a display device is provided. The method includes: obtaining a refresh frequency of a current frame image; adjusting a common voltage of all pixels in a second vertical blank interval to control a difference value between a root mean square of voltage differences between common voltages and pixel voltages of the pixels in a first vertical blank interval when a reference frame image is displayed, and a root mean square of voltage differences between common voltages and pixel voltages of the pixels in the second vertical blank interval when a current frame image is displayed to be within a preset-voltage-difference-range, such that the difference in decrease levels of potentials of the pixels at different refresh frequencies are greatly reduced, the screen brightness displayed on the display device at different refresh frequencies tend to be consistent, and a screen flicker phenomenon is further improved.