Curved Liquid Crystal Panel Retardation Alignment for Light Leakage
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Solution Overview
Problem
Liquid crystal panels with asymmetric shapes, particularly those with acute angles in plan view, experience increased stress concentration and light leakage in black display states due to birefringence, which existing optical compensation layers fail to adequately address.
Innovation Solution
A liquid crystal panel design with specific corner angles and curvature, combined with a retardation plate having a tilted fast axis relative to the polarization axis, compensates for birefringence-induced stress and reduces light leakage by optimizing the orientation of liquid crystal molecules and retardation plate alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an optical compensation layer is added to cancel retardation caused by birefringence, then light leakage in black display state is prevented, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the optical compensation function from a separate layer structure and integrates it into the substrate itself through stress control. By removing the need for additional compensation layers and instead controlling the substrate's stress state during manufacturing, the solution eliminates light leakage while reducing device complexity.
Solution Approach 2:
The patent introduces stress as an intermediary mechanism to control birefringence. By applying controlled stress to the substrate through specific manufacturing processes, the birefringence is minimized, thereby preventing light leakage without requiring complex optical compensation layers.
2Adaptability or versatility
If the liquid crystal panel has an asymmetric shape with acute angles in plan view, then design flexibility and adaptability improve, but stress concentration and light leakage increase
Solution Approach 1:
The patent applies local quality control by addressing stress concentration at specific acute angle regions through localized stress relief measures during manufacturing. This allows the panel to maintain its asymmetric shape for design flexibility while preventing light leakage at the problematic corner regions.
Solution Approach 2:
The patent implements preliminary anti-action by pre-applying stress relief measures during the manufacturing process before the panel is assembled. By controlling the substrate's stress state during fabrication, the design prevents stress concentration at acute angles, thereby eliminating light leakage while maintaining design flexibility.
3Ease of manufacture
If the substrate is curved to reduce stress, then manufacturing ease improves, but birefringence control becomes more difficult
Solution Approach 1:
The patent changes the stress parameter of the substrate through controlled manufacturing processes. By adjusting the stress state during substrate fabrication and assembly, the patent achieves uniform birefringence control while maintaining ease of manufacture, resolving the contradiction between manufacturing ease and precision.
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
Effectively minimizes light leakage in black display states by balancing stress-induced birefringence across the panel, ensuring uniform retardation compensation and reduced optical defects.
Implementation Method 1
The substrate included in the liquid crystal panel, which has a curved shape in cross sectional view, is subject to a bending stress. The bending stress causes birefringence.
Implementation Method 2
The substrate of the liquid crystal panel disclosed in JP-A-2010-256680 is provided with an optical compensation layer to cancel the retardation caused by the birefringence.
Data Source
AI summary
According to an aspect, a liquid crystal panel has a first corner and a second corner, and an angle of the first corner is smaller than that of the second corner. The liquid crystal panel includes a first substrate, a second substrate, a liquid crystal layer, a first polarizer having a first polarization axis, a second polarizer having a second polarization axis orthogonal to the first polarization axis, and a retardation plate between the first and second polarizers and having a birefringence property. An initial orientation direction of liquid crystal molecules of the liquid crystal layer is parallel to the second polarization axis. The liquid crystal panel is such curved that a central part thereof has a valley shape. A fast axis of the retardation plate is tilted in a clockwise direction relative to the second polarization axis when viewed from a side where the valley shape is formed.