Display Driving Circuit Gamma Curve Adaptation for Frame Rate Variability
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Solution Overview
Problem
High-definition game and virtual reality images take a long time to render, leading to a deterioration in image quality when the rendering time exceeds the display device's frame rate, particularly causing afterimage and brightness differences due to changing frame rates.
Innovation Solution
A display device with a driving circuit that converts image signals into data voltage signals using different gamma curves based on the operating mode, applying a first gamma curve for normal mode to improve afterimage and a second gamma curve for frequency variable mode to reduce brightness differences and prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate is increased to display high-definition game and virtual reality images, then the image quality should be improved, but the rendering time becomes longer than the frame rate causing image quality deterioration
Solution Approach 1:
The patent changes the gamma curve parameter based on the operating mode. In frequency variable mode, it applies a second gamma curve with higher voltage levels compared to the first gamma curve in normal mode. This parameter change compensates for the image quality deterioration caused by the mismatch between rendering time and frame rate, allowing the display to maintain quality even when operating at varying frame rates.
2Adaptability or versatility
If the frame rate is changed adaptively to match rendering time, then the compatibility with different rendering speeds is improved, but brightness differences and flicker occur
Solution Approach 1:
The patent dynamically changes the gamma curve parameter based on the operating mode. When in frequency variable mode, it switches to the second gamma curve which has higher voltage levels, compensating for the brightness differences that occur during frame rate changes. This maintains illumination stability while preserving frame rate adaptability.
Solution Approach 2:
The patent converts the harmful effect of frame rate variation (causing brightness differences and flicker) into a beneficial outcome by using the second gamma curve. The higher voltage levels in the second gamma curve compensate for the brightness fluctuations, turning the problematic frame rate variability into an opportunity to enhance image quality through adaptive gamma correction.
3Device complexity
If a fixed gamma curve is used for all modes, then the device complexity is reduced, but image quality deteriorates when frame rate changes
Solution Approach 1:
The patent implements a dynamic gamma curve selection mechanism that automatically switches between the first and second gamma curves based on the operating mode. This dynamic adaptation allows the system to maintain high image quality in both normal and frequency variable modes without requiring manual configuration, resolving the contradiction between device complexity and image quality.
Data Source
AI summary
A display device includes a display panel including gate lines, data lines, and pixels connected to the gate lines and the data lines and a driving circuit which controls the display panel in response to an image signal, a control signal, and a mode signal from an outside to display an image through the display panel. The driving circuit converts the image signal to data voltage signals corresponding to a first gamma curve to apply the data voltage signals to the data lines when the mode signal represents a normal mode and converts the image signal to data voltage signals corresponding to a second gamma curve different from the first gamma curve to apply the data voltage signals to the data lines when the mode signal represents a frequency variable mode.