Liquid Crystal Display Optical Compensation Layer
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Solution Overview
Problem
Liquid crystal display panels face issues with light leakage and color cast due to non-uniform stress and birefringence, leading to suboptimal display performance, especially in the L0 state where pressure causes deformation and polarization state changes.
Innovation Solution
The liquid crystal display panel incorporates an optical compensation layer with a third alignment film and a first liquid crystal molecular layer, which anchors first liquid crystal molecules to compensate for the polarization state changes caused by the liquid crystal layer, ensuring linearly polarized light is maintained even under pressure, thereby preventing light leakage and improving color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical compensation layer is added to compensate for polarization state changes, then light leakage and color cast are reduced, but device complexity increases
Solution Approach 1:
The optical compensation layer is divided into multiple functional sub-layers: a first liquid crystal molecular layer for primary compensation and a second liquid crystal molecular layer for additional polarization state adjustment. This segmentation allows each sub-layer to perform a specific compensation function, effectively addressing polarization state changes while maintaining manageable structural complexity through functional decomposition.
Solution Approach 2:
The optical compensation layer uses composite liquid crystal material compositions with different molecular structures and optical properties. The first and second liquid crystal molecular layers have different birefringence characteristics and response properties, creating a composite structure that provides enhanced compensation capability across different viewing angles and pressure conditions.
2Reliability
If liquid crystal molecules are anchored to maintain linear polarization under pressure, then light leakage is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes in the liquid crystal molecules themselves, specifically molecules with high anchoring energy and specific birefringence values. By selecting liquid crystal materials with optimized molecular parameters (such as elongation ratio, polarizability anisotropy, and anchoring energy), the system achieves stable polarization state maintenance under pressure without requiring extremely precise manufacturing tolerances.
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 cancels out polarization state changes due to non-uniform stress, reducing light leakage and color cast, resulting in improved display quality and consistency across different viewing angles.
Implementation Method 1
The first alignment film is configured to anchor a part, proximate to the first alignment film, of second liquid crystal molecules in the second liquid crystal molecular layer. The second alignment film is configured to anchor a part, proximate to the second alignment film, of the second liquid crystal molecules in the second liquid crystal molecular layer.
Implementation Method 2
Liquid crystal display panels face issues with light leakage and color cast due to non-uniform stress and birefringence, leading to suboptimal display performance
Data Source
AI summary
A liquid crystal display panel includes a first and second base substrates, a liquid crystal layer and an optical compensation layer. In the liquid crystal layer, a first alignment film is configured to anchor a part, proximate to the first alignment film, of second liquid crystal molecules, and a second alignment film is configured to anchor a part, proximate to the second alignment film, of the second liquid crystal molecules. In the optical compensation layer, a third alignment film is configured to anchor first liquid crystal molecules proximate to the third alignment film. A direction of orthogonal projections of long axes of the first liquid crystal molecules is parallel to a direction of orthogonal projections of long axes of second liquid crystal molecules anchored by the first and second alignment films. Rubbing directions of the first alignment film, the second alignment film and the third alignment film are the same.