Liquid Crystal Display Pixel Chromaticity Compensation
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Solution Overview
Problem
Liquid crystal display devices fail to accurately display colors due to chromaticity coordinate displacement caused by gray scale changes, leading to inaccurate color representation.
Innovation Solution
The implementation of a liquid crystal display device configuration where pixels allocated to the same color have color filters with different tones and independent voltage control, along with varying liquid crystal layer thickness and electrode configurations, to compensate for chromaticity coordinate displacement and maintain consistent color representation across gray scales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transmissivities of lights at respective wavelengths are changed depending on gray scales to display different luminance levels, then the luminance expression is improved, but the chromaticity coordinates are displaced and color accuracy deteriorates
Solution Approach 1:
The invention divides a single pixel into multiple sub-pixels (first pixel and second pixel) that are allocated to the same color but have different color filters with different color tones. Each sub-pixel can be independently controlled with different voltages, allowing the system to maintain accurate chromaticity coordinates while expressing different luminance levels by adjusting the relative activation of each sub-pixel.
Solution Approach 2:
The invention applies different color filters with different color tones to different regions (first pixel and second pixel) within the same color allocation. This local differentiation in color filter characteristics enables each region to contribute differently to the overall color output, compensating for chromaticity displacement while maintaining luminance expression.
2Manufacturing precision
If color filters with different color tones are used in different pixels allocated to the same color, then chromaticity coordinate displacement is compensated, but device complexity increases
Solution Approach 1:
The invention makes pixels allocated to the same color serve multiple functions: they both contribute to luminance expression and work together to maintain accurate chromaticity coordinates. The first pixel and second pixel, despite having different color filters, are both allocated to the same color and work in concert to achieve color accuracy while enabling luminance variation.
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 configuration ensures that colors are accurately displayed without change in tone, even as gray scales are adjusted, by adjusting the luminance ratio between pixels and controlling drive voltages, thereby maintaining consistent chromaticity coordinates.
Implementation Method 1
an optical axis direction of the liquid crystal is changed in response to the gray scale and hence, a polarized state of the light is changed
Implementation Method 2
a polarized state of the light is changed
Implementation Method 3
red, green and blue color filters are provided to three neighboring respective pixels and the above-mentioned light transmission quantity based on the gray scale is obtained in the pixels which are allocated to respective colors
Data Source
AI summary
The present invention provides a liquid crystal display device which includes a first pixel and a second pixel which are arranged close to each other and are allocated to the same color, and color filters which differ in color tone and are formed on the first pixel and the second pixel, wherein a voltage for driving liquid crystal of the first pixel and a voltage for driving liquid crystal of the second pixel are controlled independently from each other.