Liquid Crystal Panel With Orthogonal Compensation Axes
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Solution Overview
Problem
Liquid crystal display panels in the related art suffer from light leakage and color cast issues due to non-uniform stress and phase retardation caused by external forces, leading to polarization state changes and color deviations at different viewing angles.
Innovation Solution
Incorporating a first and second optical compensation layer with specific optic axis orientations and materials with positive or negative dispersion, positioned to offset phase retardations and compensate for polarization changes, ensuring orthogonal projections of optic axes align appropriately to maintain polarization and reduce color deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical compensation layer is used, then the device complexity is reduced, but light leakage and color cast problems occur due to non-uniform stress and phase retardation
Solution Approach 1:
The optical compensation function is divided into two separate layers: a first optical compensation layer with its optic axis parallel to the liquid crystal molecule projection, and a second optical compensation layer with its optic axis perpendicular to the liquid crystal molecule projection. This segmentation allows each layer to independently compensate for different components of phase retardation caused by external forces, thereby reducing light leakage and color cast while maintaining manageable device complexity.
2Reliability
If optical compensation layers with specific optic axis orientations are added, then polarization state stability is improved, but the device complexity increases
Solution Approach 1:
Each optical compensation layer is designed with a specific local optical property: the first layer has its optic axis oriented parallel to the liquid crystal molecule projection to compensate for phase retardation in one direction, while the second layer has its optic axis oriented perpendicular to compensate for phase retardation in the orthogonal direction. This local quality differentiation enables targeted compensation for stress-induced polarization changes without requiring a completely complex multi-layer structure.
3Object-affected harmful factors
If materials with positive or negative dispersion are used in the optical compensation layers, then color cast is reduced across viewing angles, but manufacturing precision requirements increase
Solution Approach 1:
The optical compensation layers utilize composite material strategies by selecting materials with specific dispersion characteristics (positive or negative dispersion) to counterbalance color cast effects. The first optical compensation layer and second optical compensation layer can use materials with complementary dispersion properties, creating a composite optical system that maintains color accuracy across different viewing angles while managing manufacturing precision through established material selection criteria.
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 minimizes light leakage and color cast problems by maintaining consistent polarization and color integrity across various viewing angles, enhancing display quality.
Implementation Method 1
non-uniform stress and phase retardation caused by external forces, leading to polarization state changes
Implementation Method 2
An orthogonal projection of an optic axis of the first optical compensation layer on the first base is parallel to orthogonal projections of optic axes of liquid crystal molecules in the liquid crystal layer on the first base
Implementation Method 3
A material of the first optical compensation layer and a material of the second optical compensation layer are both a material with positive dispersion; or a material of the first optical compensation layer is a material with positive dispersion, and a material of the second optical compensation layer is a material with negative dispersion
Data Source
AI summary
A liquid crystal display panel includes a first base, a second base disposed opposite to the first base, a liquid crystal layer and a first optical compensation layer that are disposed between the first base and the second base, and a second optical compensation layer disposed on a side of the first base away from the liquid crystal layer or on a side of the second base away from the liquid crystal layer. An orthogonal projection of an optic axis of the first optical compensation layer on the first base is parallel to orthogonal projections of optic axes of liquid crystal molecules in the liquid crystal layer on the first base. An orthogonal projection of an optic axis of the second optical compensation layer on the first base is perpendicular to the orthogonal projection of the optic axis of the first optical compensation layer on the first base.