Liquid Crystal Display Multiple Polarizer Layer Oblique Light Leakage
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining high contrast ratios due to oblique light leakage, which is exacerbated by the polarization properties of polarizing plates and the elastic constants of liquid crystal materials, leading to poor viewing angle characteristics and color distortions.
Innovation Solution
A liquid crystal display device with a multiple polarizer layer comprising a first polarizer layer with positive uniaxiality and a second polarizer layer with negative uniaxiality, positioned strategically to enhance polarization degrees for both forward and oblique light directions, combined with liquid crystal materials having specific elastic constants to minimize light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional single polarizer layer is used, then the device structure is simple, but oblique light leakage occurs and viewing angle characteristics deteriorate
Solution Approach 1:
The polarizer is divided into multiple layers (first polarizer layer and second polarizer layer) with different uniaxiality characteristics. The first polarizer layer has positive uniaxiality while the second has negative uniaxiality, allowing each layer to contribute differently to polarization control and reduce oblique light leakage.
Solution Approach 2:
The patent uses a composite polarizer structure combining materials with different optical properties (positive uniaxial and negative uniaxial materials) to achieve superior polarization control. This composite approach allows the system to maintain high polarization degree for both forward and oblique light directions.
2Object-affected harmful factors
If liquid crystal material with high elastic constants is used, then light leakage is reduced, but the response speed decreases
Solution Approach 1:
The patent optimizes the elastic constants of the liquid crystal material by selecting specific values (K1, K2, K3) that balance light leakage reduction and response speed. The elastic constants are carefully chosen to achieve the desired performance without excessive trade-offs.
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 effectively suppresses oblique light leakage and improves viewing angle characteristics, maintaining high contrast ratios and reducing color distortions, thereby enhancing the overall image quality of liquid crystal display devices.
Implementation Method 1
the first polarizer layer and the second polarizer layer having different uniaxiality, thereby to enhance a polarization degree of light which has passed through the liquid crystal panel
Implementation Method 2
a first polarizer layer and a second polarizer layer having different uniaxiality
Data Source
AI summary
A liquid crystal display device comprising a liquid crystal panel having a cell 15 and polarizing plates 11, 12; wherein a liquid crystal molecule is rotated in parallel to the cell 15, the polarizing plate 12 has a multiple polarizer layer formed thereon, the multiple player having a first polarizer layer having a higher polarization degree with respect to a light from a forward direction than a polarization degree with respect to a light from a oblique direction and a second polarizer layer having a higher polarization degree with respect to a light from a oblique direction than a polarization degree with respect to a light from a forward direction, and an average elastic constant of a splay elastic constant K1, a twist elastic constant K2, and a bend elastic constant K3 of liquid crystal material is equal to 10×10−12 N or larger and satisfies a relationship of K1/K2<=1.5.