Display Gate Driver Voltage Compensation for Flicker
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Solution Overview
Problem
Display devices face issues with uneven brightness and flickering when dynamically adjusting the refresh rate due to the reduction in screen brightness, which occurs when reducing the refresh rate to manage complex computations.
Innovation Solution
A display device with a driving circuit that includes a timing controller and a gate driver, which dynamically adjusts the voltage difference between the enable and disable voltage signals based on the refresh rate to maintain consistent brightness, by switching between different voltage levels for the scan lines, ensuring a larger voltage difference at higher refresh rates and a smaller difference at lower rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the refresh rate is reduced to allow longer computation time for complex animations, then frame continuity is improved, but screen brightness is reduced causing uneven brightness and flicker
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage difference between enable and disable signals based on the refresh rate. When the refresh rate is reduced, the voltage difference is increased to compensate for the brightness reduction, thereby maintaining consistent screen brightness across different refresh rates while allowing longer computation time for frame continuity
2Productivity
If the refresh rate is dynamically adjusted to match computation speed, then frame discontinuity is reduced, but brightness stability deteriorates
Solution Approach 1:
The patent implements parameter changes by dynamically modifying the voltage difference parameter in response to refresh rate changes. The timing controller adjusts the voltage difference between enable and disable signals according to the current refresh rate, ensuring that brightness remains stable even when the refresh rate is dynamically adjusted to match computation speed
Solution Approach 2:
The patent employs feedback mechanisms where the timing controller monitors the refresh rate and automatically adjusts the voltage difference parameter accordingly. This closed-loop control ensures that brightness stability is maintained through continuous adaptation to changing refresh rates, resolving the contradiction between frame output smoothness and brightness stability
Data Source
AI summary
A display device includes a display array and a driving circuit. The display array includes at least one scan line. The driving circuit drives the display array and includes a timing controller and a gate driver. The timing controller controls a refresh rate of the display array at a first frequency or a second frequency, where the first frequency is higher substantially than the second frequency. The gate driver switches between supplying an enable voltage signal and a disable voltage signal to the scan line. Under the first or frequency, a corresponding first or second voltage difference exists between the enable voltage signal and the disable voltage signal. The first voltage difference is substantially greater than the second voltage difference, and the enable voltage signal has a same enable period.