LCD Color Compensation via Gamma Curve Tuning
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Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with cell light leakage, environment flare, and non-normalized channel chromaticity due to dispersion and variations in liquid crystal and wavelength, leading to inefficient color representation and viewing angle limitations.
Innovation Solution
A color compensation method that tunes photo-electronic gamma curves for red, green, and blue signals, establishes a color database with brightness and color gamut eigenvalues, and applies compensated signals to achieve accurate color representation by calculating chromaticity eigenvalues and using a matrix-based formula to generate compensated colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If active matrix LCD is used to increase scanning speed, then scanning speed is improved, but device complexity increases due to more transistors and display units
Solution Approach 1:
The display is divided into multiple independent pixel elements, each with its own transistor and sub-display units (R, G, B). This segmentation allows each pixel to be controlled independently, achieving high scanning speed while distributing the complexity across multiple identical modular units rather than requiring a single complex control system.
Solution Approach 2:
The patent applies color compensation by adjusting the photo-electronic gamma curve parameters for red, green, and blue channels. By tuning these parameters to normalize chromaticity and compensate for liquid crystal variations, the system maintains color accuracy without increasing the physical device complexity, as the compensation is achieved through parameter adjustment rather than additional hardware.
2Device complexity
If passive matrix LCD is used to reduce device complexity, then device complexity is reduced, but scanning speed decreases and viewing angle is limited
Solution Approach 1:
The patent uses parameter adjustment of the photo-electronic gamma curve to compensate for the inherent limitations of passive matrix LCD. By tuning the gamma parameters for each color channel and normalizing chromaticity, the system optimizes color representation and viewing angle without changing the basic passive matrix structure, thus maintaining low device complexity while improving performance.
3Device complexity
If channel chromaticity is not normalized due to dispersion and liquid crystal variations, then device complexity is reduced, but measurement precision of color accuracy deteriorates
Solution Approach 1:
The patent normalizes channel chromaticity by adjusting the photo-electronic gamma curve parameters for red, green, and blue channels. This parameter tuning compensates for dispersion and liquid crystal variations, achieving accurate color representation without adding complex hardware. The normalization process ensures consistent chromaticity across different wavelengths and liquid crystal conditions.
Solution Approach 2:
The patent establishes a color database by measuring actual chromaticity values and using this feedback to adjust the gamma curve parameters. The measured chromaticity data is fed back into the system to calculate compensation values, which are then applied to normalize the color output. This feedback mechanism ensures continuous color accuracy without requiring complex real-time adjustment hardware.
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 method effectively compensates for color differences in LCDs, improving color accuracy and reducing the impact of light leakage and flare, allowing for better color representation and expanded viewing angles.
Implementation Method 1
Liquid crystal displays (LCD) have become widely used, with a working principle based on alignment condition of liquid crystal molecules changing by application of an electrical field so as to change the path of light passing therethrough
Data Source
AI summary
A color compensation method for a display device. A brightness eigenvalue and color gamut eigenvalue of the display device is determined. A plurality of signals of three major colors are applied into the display device to display a plurality of colors. The colors are measured to get a plurality of chromaticity eigenvalues. The brightness eigenvalue, the color gamut eigenvalue and the signals of the three major colors are applied into a formula to establish a color database. A target chromaticity eigenvalue and a data eigenvalue in the color database are applied into another formula to calculate a compensated signal eigenvalue to compensate color difference of the display device.