LCD FRC Pattern Segmentation for Gray Level Distribution
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face issues with display quality due to the concentration of higher gray levels on specific pixels, leading to patterns like flowing lines and lattice patterns, caused by the same frame rate control (FRC) patterns for red, green, and blue sub-pixels, which degrade image quality.
Innovation Solution
The implementation of separate frame rate control (FRC) portions for red, green, and blue data, each generating distinct FRC patterns for consecutive frames based on the lower bits of the input data, ensuring that the gray levels are distributed differently across the pixel blocks, thereby minimizing patterns like flowing lines and lattice patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same FRC pattern is applied to red, green, and blue sub-pixels, then the device complexity is reduced, but display quality deteriorates due to pattern formation
Solution Approach 1:
The patent divides the FRC control into separate portions for red, green, and blue sub-pixels. Each color channel has its own FRC portion that independently generates FRC patterns, allowing different spatial distributions for each color. This segmentation eliminates the pattern formation issue while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent applies different FRC patterns to different color channels (red, green, blue) based on their specific characteristics. Each color sub-pixel receives a customized FRC pattern that is optimized for its local requirements, rather than applying a uniform pattern across all colors. This local differentiation resolves the display quality issue.
2Productivity
If FRC is used to reduce bit depth, then productivity is improved by enabling lower-cost driving ICs, but harmful patterns appear due to gray level concentration
Solution Approach 1:
The patent segments the FRC operation into separate processing streams for each color channel. By independently managing FRC for red, green, and blue sub-pixels, the system maintains the cost benefits of reduced bit depth while eliminating the harmful patterns that arise from uniform gray level concentration across all colors.
Solution Approach 2:
The patent changes the FRC pattern parameters for each color channel independently. By varying the spatial distribution patterns across different color channels, the system maintains the average gray level requirements for cost efficiency while preventing the formation of visible patterns through parameter diversification.
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
This approach improves display quality by ensuring that higher gray levels are evenly distributed across the pixels, reducing the occurrence of undesirable patterns and enhancing overall image clarity.
Implementation Method 1
A voltage applied between the electrodes may induce an electric field across the layer of liquid crystal molecules. The alignment of the liquid crystal molecules may be changed based on an intensity of the induced electric field, thereby changing the light transmissivity of the LCD device.
Data Source
AI summary
A liquid crystal display device includes first to third FRC portions. The first to third FRC portions converts n-bit R, G and B input data into (n−m)-bit R, G and B data having first to third FRC patterns for consecutive P frames according to lower m bits of the n-bit R, G and B input data, respectively. The (n−m)-bit R, G and B data for each of the consecutive P frames correspond to R, G and B sub-pixels of the pixels of the pixel block, respectively.