Inclined Electrode Patterns for Display Visibility
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Solution Overview
Problem
Conventional liquid crystal displays, particularly in vertical alignment modes, face challenges in improving visibility and aperture ratio due to limitations in light transmittance and gamma characteristics, especially when viewed from different angles.
Innovation Solution
The display apparatus incorporates a first substrate with a pixel electrode and a second substrate featuring a common electrode, both with patterns inclined at specific angles, which alternately arrange to align liquid crystal molecules differently, enhancing visibility and aperture ratio by controlling light transmittance and reducing gamma distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional vertical alignment mode is used, then the liquid crystal molecules are vertically aligned to transmit light, but the viewing angle and gamma characteristics are limited
Solution Approach 1:
The pixel electrode and common electrode are divided into multiple inclined patterns (first pattern and second pattern) with different orientations. These segmented patterns create multiple liquid crystal domains within each pixel, allowing different viewing angles to be optimized simultaneously while maintaining good light transmittance characteristics.
Solution Approach 2:
The first and second patterns are designed with asymmetric inclination angles relative to the center line of the pixel. The first pattern inclines at a specific angle while the second pattern inclines at a different angle, creating asymmetric electric field distributions that improve gamma characteristics and viewing angle performance compared to conventional symmetric vertical alignment.
2Adaptability or versatility
If the pixel electrode and common electrode are patterned with micro-slits, then the liquid crystal domains are formed to improve viewing angle, but the aperture ratio is reduced
Solution Approach 1:
Instead of using conventional micro-slit patterns with small dimensions, the invention uses inclined patterns with optimized width parameters (about 8-12 micrometers) and specific inclination angles. This parameter optimization allows the patterns to be wide enough to maintain high aperture ratio while still being inclined enough to create effective liquid crystal domains for improved viewing angle.
3Area of stationary object
If the patterns are made wider to improve aperture ratio, then more light can pass through, but the liquid crystal domain formation may be affected
Solution Approach 1:
The patterns are designed with inclination in the vertical direction rather than being simple horizontal micro-slits. This dimensional change allows the patterns to achieve effective domain formation through their inclination angle while maintaining larger horizontal width for higher aperture ratio, effectively decoupling the two requirements.
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
This configuration improves the visibility and display quality by optimizing light transmittance and gamma characteristics, offering better performance compared to conventional displays, especially in intermediate gray scale areas and varying viewing angles.
Implementation Method 1
the liquid crystal molecules are driven by a fringe field formed between the micro-slits
Implementation Method 2
the liquid crystal molecules of the liquid crystal layer are vertically aligned with respect to the two substrates when an electric field is formed between the two substrates
Implementation Method 3
the liquid crystal molecules are driven by a fringe field formed between the micro-slits
Data Source
AI summary
A display apparatus includes a first substrate including a pixel electrode including a first pattern inclined at first and second angles with respect to a center line and a second substrate including a common electrode including a second pattern alternately arranged with the first pattern. The first angle is about +35 degrees to about +45 degrees and the second angle is about −35 degrees to about −45 degrees.