Dominant Color Gamma Correction for Flat Panel Displays
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Solution Overview
Problem
Conventional source driver circuits in flat panel displays use a resistor string for generating reference voltage, limiting individual Gamma correction for red, green, and blue, resulting in suboptimal display quality due to color distortion caused by using a room temperature gray level gamma curve as the basis for correction.
Innovation Solution
A method and apparatus that evaluates weighted values of red, green, and blue in an image signal to determine the dominant color, allowing for Gamma correction based on the dominant color, using reference voltage tables or a programmable generator to produce the necessary correction voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a resistor string is used for generating reference voltage, then the device complexity is reduced, but Gamma correction cannot be individually performed for red, green and blue colors
Solution Approach 1:
The single resistor string is segmented into multiple independent resistor strings, with each string dedicated to generating reference voltage for a specific color (red, green, or blue). This segmentation enables independent Gamma correction for each color while maintaining relatively simple circuit structures through modular design
Solution Approach 2:
The system dynamically switches between different resistor strings based on the dominant color detected in the image signal. The switching mechanism allows the system to adaptively select the appropriate reference voltage for the current color, enabling flexible Gamma correction without requiring all color circuits to be active simultaneously
2Device complexity
If a room temperature gray level gamma curve is used as the basis for Gamma correction, then the device complexity is reduced, but color distortion occurs due to varying Gamma curves by color
Solution Approach 1:
Instead of using a single uniform Gamma correction curve for all colors, the system implements color-specific Gamma correction by selecting different reference voltage tables corresponding to red, green, or blue. Each color receives tailored Gamma correction parameters that match its specific Gamma curve characteristics, eliminating color distortion while maintaining manageable system complexity
Solution Approach 2:
The system changes the reference voltage parameters dynamically based on the dominant color. By selecting different reference voltage tables for different colors and adjusting the Gamma correction parameters accordingly, the system adapts to color-specific characteristics and eliminates the need for complex real-time calculations
Data Source
AI summary
A method and apparatus for gamma correction and a flat panel display using the same. Weighted values corresponding to red, green and blue of an image signal are respectively evaluated to determine the dominant color in the image signal, and a Gamma correction based on the dominant color is then performed, thereby obtaining displaying quality similar with that obtained by independently performing red, green, or blue Gamma correction.