Display Device Gamma Curve Adjustment for Flicker Reduction
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Solution Overview
Problem
Display devices using hold-type drive methods suffer from motion blur, while pulse-type drive methods reduce motion blur but introduce flicker due to brightness differences between bright and black sub-frames, degrading image quality.
Innovation Solution
A display device and method utilizing a gray scale value counting module, ratio generating module, and sub-frame function modules to generate first and second gamma curve functions based on image data and a ratio value signal, allowing for the creation of first and second sub-frame image data that reduce brightness differences and minimize flicker by adjusting gamma curve functions according to predetermined average gray scale values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse-type drive method is used, then motion blur is reduced, but flicker is introduced due to brightness differences between sub-frames
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting gamma curve parameters (gamma1, gamma2, gamma3) based on the average grayscale value of the current frame. This allows the brightness distribution in sub-frames to be optimized adaptively, reducing flicker while maintaining motion clarity. The gamma parameters are modified according to the formula: new_gamma1 = gamma1 + delta_gamma1, new_gamma2 = gamma2 + delta_gamma2, where delta_gamma values are calculated based on average grayscale feedback.
Solution Approach 2:
The patent implements a feedback mechanism by calculating the average grayscale value of each frame and using it to adjust the gamma curve parameters for the next frame. This closed-loop control ensures that brightness differences between sub-frames are minimized adaptively. The feedback process: calculate average grayscale → determine parameter adjustment amount → update gamma parameters → display sub-frames with optimized brightness distribution.
2Reliability
If black insertion technology is used to create sub-frames, then motion blur is eliminated, but obvious brightness difference causes flicker
Solution Approach 1:
The patent modifies the brightness parameters of sub-frames by adjusting gamma curve parameters based on average grayscale feedback. Instead of using fixed black insertion with extreme brightness differences, the system dynamically tunes the gamma parameters to create subtle brightness variations that are less perceptible as flicker. The adjustment ensures that while sub-frames remain distinguishable for motion clarity, their brightness difference stays within acceptable thresholds.
Solution Approach 2:
The patent transforms the static black insertion approach into a dynamic system where sub-frame brightness parameters are continuously adjusted based on real-time average grayscale measurements. This dynamic adaptation allows the system to maintain motion blur elimination while adapting to different image content and lighting conditions, reducing perceptible flicker.
3Reliability
If frame rate is increased to reduce motion blur, then dynamic image quality improves, but power consumption increases
Solution Approach 1:
The patent uses periodic action by dividing each frame into multiple sub-frames displayed in sequence, achieving the effect of higher frame rates while maintaining the original frame rate's power consumption characteristics. The sub-frames are displayed periodically with optimized brightness parameters, providing motion clarity benefits of high frame rates without the continuous high-power demand of actual high frame rate operation.
Solution Approach 2:
The patent optimizes power consumption by dynamically adjusting gamma parameters based on average grayscale feedback, ensuring that sub-frames are displayed with minimal necessary brightness differences. This reduces the energy required for display while maintaining the perceptual benefits of reduced motion blur, as the display operates at original frame rate power levels rather than high frame rate power levels.
Data Source
AI summary
A display device includes a gray scale value counting module, a ratio generating module, a first sub-frame function module, a second sub-frame function module, and a display panel. The gray scale value counting module is configured for generating a gray scale value counting signal according to image data of each frame. The ratio generating module is configured for generating a ratio value signal according to the gray scale value counting signal. The first and second sub-frame function module are configured for generating first sub-frame image data and second sub-frame image data according to the ratio value signal and the image data respectively. The display panel is configured for displaying a first sub-frame image and a second sub-frame image according to the first and second sub-frame image data. A method for driving a display device is also provided.