Liquid Crystal Panel Polarizer Dichroic Ratio Optimization
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Solution Overview
Problem
Liquid crystal displays (LCDs) have a low contrast ratio when viewed from oblique directions, which limits their image clarity and vividness.
Innovation Solution
A liquid crystal panel design featuring polarizers with a dichroic ratio between 40 to 100, combined with a retardation layer, where at least one polarizer is dyed with a dichroic material and has a specific birefringence and transmittance properties, is used to enhance contrast ratio in oblique directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizer with a high dichroic ratio is used, then the polarization performance is improved, but the contrast ratio in oblique directions deteriorates
Solution Approach 1:
The patent changes the dichroic ratio parameter of the polarizer from the conventional high value (greater than 100) to a specific range (40 to 100). This parameter change resolves the contradiction by demonstrating that an optimal intermediate value provides both sufficient polarization performance and improved contrast ratio in oblique directions, rather than using extreme high values that worsen oblique viewing performance
Solution Approach 2:
The patent inverts the conventional wisdom that higher dichroic ratio is always better. By using a lower dichroic ratio (40-100) instead of the traditionally preferred high value, the invention achieves unexpected improvement in contrast ratio while maintaining adequate polarization performance, effectively turning the conventional approach on its head
2Illumination intensity
If the dichroic ratio of the polarizer is reduced, then the contrast ratio in oblique directions is improved, but the polarization degree may deteriorate
Solution Approach 1:
The patent establishes an optimal parameter range (dichroic ratio of 40 to 100) that balances two competing requirements. Within this range, the polarizer achieves both improved contrast ratio in oblique directions and maintained polarization degree of 99% or more, resolving the contradiction through precise parameter optimization rather than extreme values
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 significantly improves the contrast ratio in oblique directions, providing better image viewability and wider viewing angles, even for larger screen sizes.
Implementation Method 1
at least one of the first and the second polarizers is dyed with a dichroic material, and a dichroic ratio thereof is from 40 to 100
Implementation Method 2
at least one of the first and the second polarizers exhibits a polarization property that the polarizer has a polarization degree of 99% or more
Implementation Method 3
at least one of the first and the second polarizers exhibits the following birefringence: Δnxy is from 0.015 to 0.030
Data Source
AI summary
A liquid crystal panel of the present invention comprise a liquid crystal cell, a first polarizer arranged on one of both sides of the liquid crystal cell, and a second polarizer arranged on the other side of the liquid crystal cell, wherein at least one of the first and the second polarizers is dyed with a dichroic material, and the dichroic ratio thereof is from 40 to 100. At least one of the polarizers preferably has a polarization degree of 99% or more and a single transmittance of 35% to 45%. Further, at least one of the polarizers preferably exhibits the following birefringence: Δnxy is from 0.015 to 0.030.The liquid crystal panel of the present invention has the above polarizers, therefore the liquid crystal panel attains high contrast ratio in oblique directions and excellent display characteristics.