Liquid Crystal Capsule Refractive Index Anisotropy for Display Uniformity
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Solution Overview
Problem
Liquid crystal display devices with liquid crystal capsules suffer from increased wavelength dispersity and transmittance differences among colors due to high refractive index anisotropy, leading to deteriorated display quality and increased fabrication costs due to the need for independent driving methods and additional circuit designs.
Innovation Solution
A liquid crystal display device with a substrate having sub-pixels featuring liquid crystal patterns composed of capsules with different refractive index anisotropies, formed using a method involving ultraviolet irradiation of capsule solutions containing liquid crystal molecules, color resins, and binders, which are dispersed and polymerized to improve transmittance uniformity and reduce fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal capsules with high refractive index anisotropy are used to achieve gray level display, then display functionality is improved, but wavelength dispersity increases and transmittance uniformity deteriorates
Solution Approach 1:
The patent applies local quality by using different refractive index anisotropy values for liquid crystal capsules in different color sub-pixels. Specifically, red sub-pixels use capsules with Δn of 0.15-0.25, green sub-pixels use capsules with Δn of 0.10-0.20, and blue sub-pixels use capsules with Δn of 0.05-0.15. This localized differentiation compensates for wavelength-dependent optical properties and achieves uniform transmittance across all colors.
2Weight of stationary object
If liquid crystal capsules are used to reduce device weight and volume, then device portability is improved, but additional fabrication steps and complexity are introduced
Solution Approach 1:
The patent merges multiple functions into the liquid crystal capsule structure itself. The capsules serve as both the liquid crystal containment vessels and the optical modulation elements, eliminating the need for separate orientation layers and complex alignment structures. The polymerized shell of the capsules provides both structural support and optical function, simplifying the overall device architecture.
3Manufacturing precision
If uniform transmittance across colors is achieved through material selection, then display quality is improved, but fabrication process complexity increases
Solution Approach 1:
The patent achieves uniform transmittance by changing the refractive index anisotropy parameter (Δn) of the liquid crystal capsules according to the wavelength characteristics of different color sub-pixels. Red sub-pixels use capsules with higher Δn (0.15-0.25), green with medium Δn (0.10-0.20), and blue with lower Δn (0.05-0.15). This parameter differentiation compensates for wavelength-dependent optical properties and achieves uniform transmittance across all colors.
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 solution enhances display quality by reducing wavelength dispersity and maintaining uniform transmittance across colors, while simplifying the fabrication process and reducing costs by eliminating the need for additional orientation layers and independent driving circuits.
Implementation Method 1
The LCD device displays an image using an optical anisotropy and a polarization property of a liquid crystal molecule
Implementation Method 2
The LCD device displays an image using an optical anisotropy and a polarization property of a liquid crystal molecule
Implementation Method 3
a method involving ultraviolet irradiation of capsule solutions containing liquid crystal molecules, color resins, and binders, which are dispersed and polymerized
Data Source
AI summary
A liquid crystal display device including: a substrate; a thin film transistor on the substrate; a pixel electrode and a common electrode on the substrate; a first liquid crystal pattern in the first sub-pixel on the pixel electrode and the common electrode, the first liquid crystal pattern including a first liquid crystal molecule; a second liquid crystal pattern in the second sub-pixel on the pixel electrode and the common electrode, the second liquid crystal pattern including a second liquid crystal molecule; and a third liquid crystal pattern in the third sub-pixel on the pixel electrode and the common electrode, the third liquid crystal pattern including a third liquid crystal molecule, wherein the first, second and third liquid crystal molecules have different refractive index anisotropies from each other.