Liquid Crystal Panel Vertical Alignment Reduces Light Leakage
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Solution Overview
Problem
Advanced Super Dimension Switch (ADS) liquid crystal display panels experience light leakage in the dark state due to deviations in optical axis alignment, leading to high brightness and low contrast.
Innovation Solution
A liquid crystal panel with vertical initial alignment of liquid crystals between substrates, utilizing alignment layers and an enhancement electrode to generate a non-zero voltage difference, reducing light leakage by aligning liquid crystals perpendicular to substrates and adjusting electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ADS technology with horizontal alignment is used, then high resolution and wide viewing angle are achieved, but light leakage occurs in dark state
Solution Approach 1:
The patent inverts the alignment mode from horizontal to vertical alignment of liquid crystal molecules. This inversion fundamentally changes the optical characteristics, eliminating the light leakage issue in dark state while preserving the high resolution and wide viewing angle advantages of ADS technology.
Solution Approach 2:
The patent changes the alignment parameter of liquid crystal molecules from horizontal to vertical orientation. This parameter change modifies the optical axis direction, thereby eliminating the mismatch between optical axes and polarizer transmission axes that causes light leakage, while maintaining other performance characteristics.
2Object-affected harmful factors
If vertical alignment is implemented, then light leakage is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent introduces an alignment layer as an intermediary component between the substrate and liquid crystal layer. This alignment layer mediates the vertical alignment of liquid crystal molecules, enabling light leakage reduction while providing a systematic approach to managing the manufacturing complexity through a dedicated functional layer.
3Reliability
If enhancement electrode is added, then electric field control is improved, but device complexity increases
Solution Approach 1:
The patent adds an enhancement electrode with specific local characteristics (different dielectric constant, positioned at specific locations) to improve electric field control in critical regions. This localized approach enhances reliability without requiring complete redesign of the entire electrode structure, thereby managing device complexity.
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 reduces light leakage in the dark state, enhancing contrast and light-transmittance while maintaining the advantages of ADS technology, such as high resolution and low power consumption.
Implementation Method 1
An initial alignment of liquid crystal in the liquid crystal layer is vertical alignment
Implementation Method 2
the first enhancement electrode is configured in such a way that a non-zero voltage difference is generated between the first enhancement electrode and at least one of the pixel electrode and the common electrode during operation of the liquid crystal panel
Data Source
AI summary
A liquid crystal panel and a display device are disclosed. The liquid crystal panel includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes a first base substrate, and a pixel electrode and a common electrode provided on the first base substrate. The second substrate is opposed to the first substrate and includes a second base substrate. The liquid crystal layer is provided between the first substrate and the second substrate in a direction perpendicular to the first base substrate. An initial alignment of liquid crystal in the liquid crystal layer is vertical alignment.