MVA LCD Panel Liquid Crystal Alignment Control for Color Shift Reduction
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Solution Overview
Problem
Multiple-domain vertical alignment (MVA) LCD panels face issues with color shift when viewed from different directions, despite improved transmittivity and brightness, leading to user discomfort.
Innovation Solution
The LCD panel design incorporates specific liquid crystal alignment controlling structures with varying orientations and protrusions to reduce color difference between horizontal and vertical views, increasing the number of liquid crystal domains and boundaries, thereby minimizing color shift while maintaining transmittivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of liquid crystal orientations is reduced to two domains to improve transmittivity, then transmittivity increases by 16%, but color shift occurs when viewed from different directions
Solution Approach 1:
The pixel is divided into multiple domains with different liquid crystal orientations. Each domain has its own alignment controlling structure (protrusions and slits), creating distinct regions that collectively reduce color shift while maintaining overall transmittivity. The segmentation of the pixel into multiple orientation domains allows the system to achieve both high transmittivity and color accuracy.
Solution Approach 2:
Different regions of the pixel are assigned different liquid crystal orientations tailored to specific viewing directions. The alignment controlling structures create local variations in molecular orientation, with each domain optimized for particular viewing angles. This local differentiation ensures that color shift is minimized across all viewing directions while maintaining high transmittivity in each local region.
2Adaptability or versatility
If four liquid crystal orientations are used in each pixel to provide wide angle function, then viewing angle is improved, but transmittivity is reduced due to increased boundaries
Solution Approach 1:
The pixel is segmented into multiple domains, each with specific liquid crystal orientations controlled by protrusions and slits. This segmentation allows different orientations to coexist without creating excessive boundaries, as the alignment controlling structures precisely define domain regions. The result is wide viewing angle coverage with minimized impact on transmittivity.
Solution Approach 2:
The invention introduces a new dimension of control through three-dimensional alignment controlling structures (protrusions extending from the substrate with slits). This vertical dimension allows for more precise control of liquid crystal orientations without increasing the horizontal footprint of boundaries, thereby maintaining transmittivity while achieving wide viewing angles through multiple orientations.
3Speed
If protrusions and slits are added to control liquid crystal orientations, then response speed is increased, but device complexity increases
Solution Approach 1:
The alignment controlling function is merged into the existing pixel electrode structure by forming protrusions and slits directly on the pixel electrode or counter electrode. This integration allows the alignment controlling structures to serve dual purposes: controlling liquid crystal orientations and maintaining electrical connectivity, thereby reducing overall device complexity while achieving fast response speeds through improved molecular alignment.
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 color difference between different viewing angles, enhancing color accuracy and user comfort without significantly affecting transmittivity, achieved by modifying the liquid crystal alignment structures in the MVA LCD panel.
Implementation Method 1
the liquid crystal molecules in each specific domain tilt in different directions
Implementation Method 2
the liquid crystal molecules tilt faster when driven by the electrical field
Implementation Method 3
Slits of the pixel electrode and protrusions of the counter electrode are arranged to form several boundaries for the liquid crystal orientations
Data Source
AI summary
A liquid crystal display (LCD) panel and an LCD device using the same are provided. The LCD panel at least includes a first color pixel and a second color pixel for displaying different colors. The second color pixel is disposed next to the first color pixel. The liquid crystal molecules in the first color pixel have at least four liquid crystal (LC) orientations including a first LC orientation. The liquid crystal molecules in the second color pixel have a plurality of LC orientations including a second LC orientation. The first LC orientation is different from all LC orientations of the second color pixel.