Hold-Type Display Sub-Frame Luminance Redistribution for Edge Blurring
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Solution Overview
Problem
Hold type liquid crystal display devices suffer from blurred contours in moving images due to 0-order holding, which cannot be effectively addressed by increasing response speed or frame frequency, leading to decreased moving picture quality without compromising luminance and contrast.
Innovation Solution
The method involves time-dividing the video signal into multiple sub-frames and redistributing luminance components among them, ensuring integrated luminance remains constant, thereby improving moving picture quality without lowering maximum luminance or contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the response speed of liquid crystal is increased, then the moving picture quality is improved, but the edge blurring caused by 0-order holding cannot be prevented
Solution Approach 1:
The patent divides one frame period into multiple sub-frames (e.g., first sub-frame, second sub-frame, third sub-frame). By segmenting the frame period, the display device can perform black resetting during specific sub-frames while maintaining image information in others, thereby eliminating edge blurring without requiring increased liquid crystal response speed.
Solution Approach 2:
The patent implements periodic black resetting by displaying black in specific sub-frames (e.g., third sub-frame) while maintaining image information in other sub-frames. This periodic action of black resetting during designated sub-frames eliminates the harmful 0-order holding effect without requiring continuous high-speed response.
2Productivity
If the rewriting speed (frame frequency) is increased, then the moving picture quality is improved, but the data transmission capacity requirements increase significantly
Solution Approach 1:
By segmenting the frame period into multiple sub-frames, the patent enables the display device to rewrite image information multiple times within one frame period without requiring proportional increase in data transmission capacity. The black resetting is performed during specific sub-frames, reducing the overall data transmission burden compared to continuous high-frame-rate rewriting.
3Object-affected harmful factors
If black resetting is performed by writing reset voltage or flashing backlight, then the moving picture quality is improved, but the maximum luminance and contrast are lowered
Solution Approach 1:
The patent segments the frame period into multiple sub-frames and performs black resetting only during specific sub-frames (e.g., third sub-frame) rather than continuously. This segmented approach allows the display device to maintain high luminance and contrast during sub-frames when image information is displayed, while still achieving the edge blurring elimination benefit of black resetting.
Solution Approach 2:
The patent implements periodic black resetting during specific sub-frames rather than continuous black resetting. This periodic action maintains high luminance and contrast during the sub-frames when image information is displayed, while still effectively eliminating the 0-order holding effect that causes edge blurring.
Data Source
AI summary
The present invention provides an image processing method of a hold type display device, a driving method of the display device and a display device driven by the method, for improving the moving picture quality without lowering the luminance and the contrast. In the image processing method for dividing one frame into sub frames, luminance components of a certain sub frame are distributed to other sub frames, so as to generate sub frame with luminance components higher than the average in the one frame and sub frame with luminance components lower than the average in the one frame, as a result of which the amount of luminance during one frame period is kept constant before and after the distribution of luminance components.