Liquid Crystal Substrate Retardation Control for Viewing Angle
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving uniform color-viewing angle characteristics due to variations in the wavelength dependence of birefringence for red, green, and blue colors, and existing solutions like modified polycarbonate films are expensive and prone to non-uniformity, while patterned optically anisotropic layers increase production costs and complexity.
Innovation Solution
A method for producing a liquid crystal cell substrate with a monoaxial or biaxial optically anisotropic layer having different film thicknesses for each color domain, formed by transferring a liquid crystalline compound layer with reactive groups, optimized for specific retardation values to improve color-viewing angle characteristics without increasing production steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical compensation sheet is used to improve viewing angle characteristics, then contrast-viewing angle characteristics are improved, but color-viewing angle characteristics remain insufficient
Solution Approach 1:
The patent applies local quality by creating optically anisotropic layers with different thicknesses corresponding to different color domains (R, G, B). Each layer has locally optimized thickness to compensate for wavelength-dependent birefringence variations, thereby improving color-viewing angle characteristics while maintaining contrast performance.
Solution Approach 2:
The patent changes the thickness parameter of optically anisotropic layers to optimize optical compensation for different wavelengths. By adjusting layer thickness rather than material composition, the patent achieves wavelength-specific compensation that improves color-viewing angle characteristics without compromising contrast performance.
2Manufacturing precision
If a modified polycarbonate film is used to control wavelength dispersion of birefringence, then color-viewing angle characteristics are improved, but the material is expensive and prone to non-uniformity
Solution Approach 1:
The patent replaces expensive modified polycarbonate films with conventional optical compensation sheets combined with patterned optically anisotropic layers. This substitution uses cheaper, more readily available materials while achieving superior color-viewing angle characteristics through precise thickness control rather than expensive material properties.
Solution Approach 2:
The patent segments the optical compensation function into multiple thin layers with different thicknesses for different color domains. This segmentation approach replaces the need for expensive bulk material modifications by achieving wavelength-specific compensation through layered structure design, improving both color performance and manufacturability.
3Manufacturing precision
If patterned optically anisotropic layers are formed to optimize retardation for each color, then color-viewing angle characteristics are improved, but production cost and complexity increase
Solution Approach 1:
The patent merges the formation of optically anisotropic layers with the existing color filter formation process. By combining these operations into a single integrated process step, the patent achieves complex patterned thickness control without adding separate production steps, thereby improving color-viewing angle characteristics while maintaining production efficiency.
Solution Approach 2:
The patent creates optically anisotropic layers that serve dual functions: optical compensation for viewing angle improvement and color domain identification. This multi-functionality eliminates the need for separate processes for each color layer, reducing production complexity while achieving precise thickness control for optimal color performance.
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 allows for stable and simple production of liquid crystal cell substrates with enhanced color-viewing angle characteristics, improving productivity and reducing costs by optimizing retardation for each color, thus enhancing the overall performance of liquid crystal display devices.
Implementation Method 1
formed by transferring a liquid crystalline compound layer with reactive groups
Implementation Method 2
variations in the wavelength dependence of birefringence for red, green, and blue colors
Implementation Method 3
a monoaxial or biaxial optically anisotropic layer having different film thicknesses for each color domain
Data Source
AI summary
Provided is a method of producing a liquid crystal cell substrate comprising forming an image having at least two different hues and having different thickness for the respective hue domains, and forming at least one monoaxial or biaxial optically anisotropic layer having different film thicknesses on the respective hue domains on the image.