Multi-domain LCD Electric Field Shielding Layer
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Solution Overview
Problem
Conventional multi-domain vertical alignment liquid crystal displays (MVA-LCDs) face issues with color shift and reduced brightness due to the need for additional transistors or capacitors to manage electric fields, which increase complexity and reduce aperture ratio.
Innovation Solution
The implementation of an electric field shielding layer adjacent to the liquid crystal layer, dividing each pixel into low-voltage and high-voltage domains with the same cell gap, allows liquid crystal molecules to tilt differently, reducing color shift without altering the pixel unit's transistor or capacitor design, thus maintaining a higher aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional transistors or capacitors are added to each pixel unit to manage electric fields, then color shift is reduced, but device complexity and aperture ratio are worsened
Solution Approach 1:
The pixel electrode is divided into multiple independent electrode regions (first, second, third, and fourth electrode regions) that can be independently controlled. This segmentation allows different voltage levels to be applied to different regions, creating multiple electric field domains without requiring additional transistors or capacitors, thus reducing color shift while maintaining simple pixel structure
Solution Approach 2:
A shielding electrode region is introduced as an intermediary element between the liquid crystal layer and the pixel electrode. This shielding electrode acts as a mediator to block or modify electric field lines, enabling the creation of distinct high-voltage and low-voltage domains without altering the basic pixel transistor structure, thereby reducing color shift while avoiding increased device complexity
2Reliability
If additional transistors or capacitors are added to each pixel unit to manage electric fields, then color shift is reduced, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode is divided into multiple independent electrode regions (first, second, third, and fourth electrode regions) that can be independently controlled. This segmentation allows different voltage levels to be applied to different regions, creating multiple electric field domains without requiring additional transistors or capacitors, thus reducing color shift while maintaining simple pixel structure
Solution Approach 2:
A shielding electrode region is introduced as an intermediary element between the liquid crystal layer and the pixel electrode. This shielding electrode acts as a mediator to block or modify electric field lines, enabling the creation of distinct high-voltage and low-voltage domains without altering the basic pixel transistor structure, thereby reducing color shift while avoiding increased device complexity
3Illumination intensity
If conventional MVA-LCD uses circular polarizer to increase brightness, then brightness is improved, but gamma curve curvature changes with viewing angle causing color shift
Solution Approach 1:
Different regions of the pixel electrode are assigned different voltage levels (high-voltage and low-voltage domains) to create locally optimized electric fields. The shielding electrode region specifically modifies the electric field distribution in its local area to prevent color shift while maintaining overall brightness through the circular polarizer configuration
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 solution effectively improves color shift in MVA-LCDs while maintaining brightness, as the electric field shielding layer optimizes the orientation of liquid crystals, allowing for flexible adjustment of the thickness and material to enhance display quality.
Implementation Method 1
the electric field shielding layer is adjacent to the liquid crystal layer, wherein the position of the electric field shielding layer is corresponding to the position of a low-voltage domain of the liquid crystal layer
Implementation Method 2
the liquid crystal layer is disposed between the active device array substrate and the opposite substrate... make liquid crystal molecules in each pixel being arranged in multi-direction
Data Source
AI summary
A multi-domain liquid crystal display (LCD) including an active device array substrate, an opposite substrate, an electric field shielding layer, and a liquid crystal layer is provided. The active device array substrate has a plurality of pixels, wherein each pixel has a pixel electrode. The opposite substrate has a common electrode disposed between the opposite substrate and the active device array substrate. The electric field shielding layer is disposed on a part of each pixel electrode. The liquid crystal layer is disposed between the active device array substrate and the opposite substrate. The liquid crystal layer corresponding to each pixel is divided into a low-voltage domain and a high-voltage domain having the same cell gap, wherein the position of the electric field shielding layer is corresponding to the position of the low-voltage domain. Color shift of the multi-domain LCD is improved effectively at oblique viewing angles.