Flat Panel Display Color Filter Thickness Optimization
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Solution Overview
Problem
Fringe Field Switching (FFS) Liquid Crystal Displays face a color shift phenomenon due to differences in transmittance between sub-pixels, caused by variations in electrode width and gap width, which affect the combination of light from red, green, and blue sub-pixels to form white light.
Innovation Solution
A flat panel display design with a color filter substrate where the thicknesses of red, green, and blue resists are configured to maintain a preset ratio of total transmittances for sub-pixels, adjusting the thickness of color resists to match the aperture ratios and prevent color shift by optimizing the pixel unit structure with varying numbers and positions of through grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the electrode width is increased, then the transmittance is decreased
Solution Approach 1:
The patent applies local quality by configuring different thicknesses of color resists (red, green, blue) for different sub-pixels based on their specific aperture ratios. Each sub-pixel receives a tailored resist thickness to compensate for its individual transmittance characteristics, thereby achieving uniform overall transmittance across all sub-pixels while maintaining the original electrode width design.
2Illumination intensity
If the width of gap between the electrodes is increased, then the transmittance is decreased
Solution Approach 1:
The patent addresses gap width variations by applying localized compensation through different color resist thicknesses. Each sub-pixel's color resist thickness is specifically configured to compensate for its gap width-induced transmittance loss, ensuring uniform overall transmittance without requiring uniform gap width across all sub-pixels.
3Illumination intensity
If the electrode width or gap width is decreased to improve pixel transmittance, then color shift phenomenon occurs
Solution Approach 1:
The patent prevents color shift by applying local quality compensation through different color resist thicknesses for different sub-pixels. Each sub-pixel receives a customized resist thickness that compensates for its specific structural variations (electrode width, gap width), thereby maintaining both high transmittance and color consistency across all sub-pixels simultaneously.
Solution Approach 2:
The patent changes the parameter of color resist thickness to compensate for structural variations in sub-pixels. By adjusting the thickness parameter of color resists (red, green, blue) according to each sub-pixel's aperture ratio and transmittance characteristics, the patent achieves uniform color output and prevents color shift while maintaining high transmittance.
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 adjusted thickness of color resists ensures that the ratio of total transmittances of sub-pixels remains consistent, preventing color shift and maintaining accurate white light emission without deviating from the preset values, as demonstrated by simulation data showing improved panel transmittance and chroma domain stability.
Implementation Method 1
The color filter substrate is placed opposite to a pixel array and includes a red resist, a green resist and a blue resist which respectively correspond to the sub-pixels
Implementation Method 2
a fringe electric field generated between pixel electrodes and a common electrode of a Thin-Film Transistor (TFT) substrate enables liquid crystal molecules between the electrodes and above the electrodes to rotate on a plane parallel to a glass substrate
Data Source
AI summary
A flat panel display is disclosed. The display includes an array substrate, and a color filter substrate. The array substrate includes a plurality of pixel units, and each pixel unit includes at least three sub-pixels. The color filter substrate is placed opposite to a pixel array and includes a red resist, a green resist and a blue resist which respectively correspond to the sub-pixels. A ratio of thicknesses of the red, green and blue resists is configured in such a way that a ratio of total transmittances of the sub-pixels corresponding to the red, green and blue resists has a preset value.