Liquid Crystal Display Panel Wire Grid Lyotropic Chromonic Polarizer
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Solution Overview
Problem
Current liquid crystal display devices have a polarization ratio of about 99.8%, which is insufficient for high-luminance displays requiring a ratio of 99.99% or more, necessitating an improvement in polarizing efficiency.
Innovation Solution
Incorporating a combination of a wire grid polarizer and a lyotropic chromonic liquid crystal polarizer in a liquid crystal display panel, where the polarizers can have the same or perpendicular transmission axes, and optionally including a protection layer and absorptive polarizers, to enhance the polarization ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single polarizing element (PVA film or nano-wire polarizer) is used, then the device structure remains simple, but the polarization ratio cannot reach 99.99% or more
Solution Approach 1:
The patent combines a wire grid polarizer and a lyotropic chromonic liquid crystal polarizer into a dual-polarizer system. The wire grid polarizer provides initial polarization with its metallic wire structure, while the lyotropic chromonic liquid crystal polarizer enhances the polarization ratio through its molecular alignment properties, achieving a combined polarization ratio of 99.99% or more that neither component could achieve alone.
Solution Approach 2:
The invention uses composite polarizing structures combining different materials: metallic wires in the wire grid polarizer and lyotropic chromonic liquid crystal molecules in the second polarizer. This composite approach leverages the complementary strengths of each material system to achieve ultra-high polarization ratios required for high-luminance displays.
2Manufacturing precision
If a wire grid polarizer is used to improve polarization ratio, then the polarization ratio increases, but light transmissivity decreases
Solution Approach 1:
The lyotropic chromonic liquid crystal polarizer acts as an intermediary between the wire grid polarizer and the liquid crystal layer. It receives partially polarized light from the wire grid, further polarizes it to achieve 99.99% polarization ratio, while its molecular structure and orientation are optimized to minimize light absorption and maximize transmissivity of the polarized component.
Solution Approach 2:
The invention optimizes parameters of the lyotropic chromonic liquid crystal polarizer including molecular orientation, concentration, and layer thickness to achieve the optimal balance between polarization ratio and light transmissivity. By controlling these parameters, the system achieves ultra-high polarization while maintaining sufficient light transmission for high-luminance display requirements.
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 combination of wire grid and lyotropic chromonic liquid crystal polarizers improves the polarization ratio to approximately 99.998%, meeting the requirements for high-luminance displays.
Implementation Method 1
A polarizing element disposed on or under the liquid crystal display panel may polarize the light. The polarizing element may include, e.g., a polyvinyl alcohol ('PVA') film. Research and development have been conducted to use a nano-wire polarizing element to improve the polarization ratio
Data Source
AI summary
A liquid crystal display panel includes a first base substrate, a wire grid polarizer disposed on the first base substrate, a lyotropic chromonic liquid crystal polarizer disposed on the first base substrate, a second base substrate facing the first base substrate and a liquid crystal layer between the first base substrate and the second base substrate.