Liquid Crystal Display Frame Processing for Flicker and Motion Blur Reduction
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Solution Overview
Problem
Liquid crystal display devices face issues with flicker and motion blur when driven at higher frame frequencies, as they require conversion of gray level values, leading to brightness differences and reduced image quality.
Innovation Solution
A liquid crystal display device with frame processing means to multiply frame frequency, timing controlling means to manage driving timing, and data driving means to continuously drive frames with adjusted gray level values, specifically converting gray levels only at edge areas where motion blur occurs, thereby minimizing flicker and brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame frequency is multiplied to reduce flicker, then flicker is reduced, but brightness differences and motion blur increase due to gray level conversion
Solution Approach 1:
The patent applies local quality by differentiating between still image frames and dynamic image frames, and further between edge areas and non-edge areas within dynamic frames. Still image frames undergo gray level conversion to prevent flicker, while dynamic image frames preserve original gray levels except at edge areas where motion blur occurs. This selective approach maintains brightness uniformity while reducing flicker.
Solution Approach 2:
The patent segments the image frame into different regions (edge areas and non-edge areas) and applies different processing methods to each segment. Edge areas undergo gray level conversion to reduce motion blur, while non-edge areas maintain original gray levels to preserve brightness uniformity. This segmentation resolves the contradiction between flicker reduction and brightness uniformity.
2Illumination intensity
If gray level values are converted to maintain brightness at higher frame frequencies, then brightness is maintained, but image quality deteriorates due to motion blur
Solution Approach 1:
The patent applies local quality by differentiating between still image frames and dynamic image frames, and further between edge areas and non-edge areas within dynamic frames. Still image frames undergo gray level conversion to prevent flicker, while dynamic image frames preserve original gray levels except at edge areas where motion blur occurs. This selective approach maintains brightness uniformity while reducing flicker.
Solution Approach 2:
The patent converts the harmful effect of motion blur at edge areas into a benefit by selectively applying gray level conversion only to these specific regions. This targeted approach transforms the problem of motion blur into an opportunity to improve image quality at critical areas without affecting the overall brightness uniformity of the display.
3Reliability
If gray level values are converted for all frames, then flicker is reduced, but processing complexity and time increase
Solution Approach 1:
The patent segments the image frame into different regions (edge areas and non-edge areas) and applies different processing methods to each segment. Edge areas undergo gray level conversion to reduce motion blur, while non-edge areas maintain original gray levels to preserve brightness uniformity. This segmentation resolves the contradiction between flicker reduction and brightness uniformity.
Solution Approach 2:
The patent applies partial action by performing gray level conversion only where necessary (still image frames and edge areas of dynamic frames) rather than converting all frames uniformly. This selective approach reduces processing complexity and time while still effectively reducing flicker in the areas where it most impacts image quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for continuous driving of still and dynamic image frames with reduced flicker and motion blur, maintaining image quality by minimizing brightness differences and optimizing frame frequency multiplication effects.
Implementation Method 1
liquid crystal molecules of the liquid crystal cell has an alignment changed by an electric field between the pixel electrode and the common electrode to thereby modulate an incident light
Data Source
AI summary
A method of driving a liquid crystal display device includes multiplying a frame frequency of an inputted current frame to generate a multiplied odd-numbered frame and a multiplied even-numbered frame; determining whether said current frame is a still image frame or a dynamic image frame; detecting an edge area at which a motion blur occurs from the multiplied odd-numbered frame and the multiplied even-numbered frame; converting gray level values of pixels positioned at the detected edge area at the multiplied odd-numbered frame and the multiplied even-numbered frame; and continuously outputting the multiplied odd-numbered still image frame and the multiplied even-numbered still image frame or continuously outputting the multiplied odd-numbered dynamic image frame and the multiplied even-numbered dynamic image frame having the converted gray level values in accordance with the determined result. A liquid crystal display device is also disclosed.