Display Refresh Frequency Gray-Scale Compensation
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Solution Overview
Problem
Display devices equipped with Free-Sync technology experience flickering when switching between high and low refresh frequencies due to differences in blank times, leading to reduced brightness and screen flickering.
Innovation Solution
A driving method that predicts the change in refresh frequency and performs gray-scale compensation based on the expected frequency value and timing, using a gray-scale compensation table to adjust the display device's brightness and prevent flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device switches between high and low refresh frequencies, then the display device can adapt to different performance requirements, but the difference in blank time causes brightness differences and screen flickering
Solution Approach 1:
The system performs preliminary detection of refresh frequency changes and calculates gray-scale compensation values in advance before the actual frequency switch occurs. By predicting the upcoming frequency change and pre-computing the necessary compensation, the system can apply the compensation at the exact moment of transition, preventing brightness flickering while maintaining frequency adaptability
Solution Approach 2:
The system dynamically adjusts the gray-scale parameter of the display based on the detected refresh frequency. When a frequency change is detected, the system modifies the gray-scale value according to pre-calculated compensation values stored in a lookup table, thereby compensating for the brightness differences caused by varying blank times at different refresh frequencies
2Productivity
If the blank time is extended to accommodate lower refresh frequencies, then the display device can maintain lower refresh rates, but the leakage impact deepens and overall brightness is reduced
Solution Approach 1:
The system compensates for the brightness reduction caused by extended blank times by dynamically adjusting the gray-scale parameter. When operating at lower refresh frequencies with longer blank times, the system applies positive gray-scale compensation values to maintain the perceived brightness, allowing the display to operate at various refresh rates without sacrificing overall brightness
Data Source
AI summary
The driving method provided by the present application includes: detecting a refresh frequency of a display device based on a plurality of predicted frames to obtain a change rule of the refresh frequency; obtaining a current refresh frequency of the display device and a corresponding frame number information; predicting an expected timing when the display device switches the refresh frequency next time and an expected frequency value after switching according to the change rule, the current refresh frequency, and the corresponding frame number information; and performing a gray-scale compensation on the display device according to the expected frequency value and the expected timing.