Image Processing Apparatus Reducing Color Non-Uniformity in Liquid Crystal Displays
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Solution Overview
Problem
Liquid crystal panels suffer from color non-uniformity and slow response speed, leading to motion blur and afterimage issues, especially when combined with color-non-uniformity correction processing, which increases memory requirements and degrades image quality.
Innovation Solution
An image processing apparatus generates sub-frame images and adjusts their lightness to produce a light and dark image pair, performing color-non-uniformity correction using specific correction values based on lightness adjustments to reduce color non-uniformity and motion blur, thereby improving response speed and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If light and dark display is performed to reduce motion blur, then response speed is improved, but color non-uniformity increases due to response speed variations across the panel surface
Solution Approach 1:
The patent applies different correction values to different regions of the liquid crystal panel surface. The correction unit generates position-dependent correction values that compensate for the varying response speeds across different locations, ensuring uniform color display while maintaining the light and dark display effect for motion blur reduction.
Solution Approach 2:
The patent changes the correction parameters based on the lightness adjustment degree. When light and dark display is performed, the correction unit selects or generates correction values that are specifically adapted to the altered signal levels, preventing color non-uniformity from arising due to the modified driving conditions.
2Manufacturing precision
If overdrive correction processing is applied to reduce response speed influence, then color non-uniformity is reduced, but memory requirements increase due to frame memory needs
Solution Approach 1:
The patent extracts only the necessary correction information from the image signal processing chain. Instead of storing entire frame images for overdrive correction, the system generates correction values based on the current image signal and position information, eliminating the need for large frame memory while maintaining color uniformity.
Solution Approach 2:
The correction values are prepared and stored in advance in a correction value storage unit, organized by position and lightness adjustment degree. This preliminary preparation allows the correction unit to quickly retrieve appropriate correction values without requiring real-time frame memory access, reducing memory requirements while maintaining correction effectiveness.
3Speed
If frame rate doubling is performed to reduce motion blur, then response speed is improved, but color non-uniformity correction becomes more difficult due to signal level changes between subframes
Solution Approach 1:
The patent implements a dynamic correction system that adapts to the specific conditions of frame rate doubling. The correction unit dynamically selects correction values based on the current subframe's lightness adjustment degree, allowing the system to handle signal level changes between subframes while maintaining effective color non-uniformity correction.
Data Source
AI summary
A plurality of sub-frame images are generated from an input frame image. Lightness of one or more sub-frame image included in the plurality of sub-frame images is adjusted to generate a light image and a dark image. Color-non-uniformity correction processing is performed on the light image and the dark image to reduce color non-uniformity of a display device using a correction value in accordance with an adjustment degree of the lightness.