Cross-Shaped Slits in MVA LCD Common Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-domain vertical alignment (MVA) liquid crystal display devices face reduced transmittance due to difficulties in applying voltage to protrusions and openings, leading to a decreased aperture ratio and lowered overall transmittance, especially when the width of slits is insufficient for proper liquid crystal alignment.
Innovation Solution
The implementation of cross-shaped slits on the common electrode, aligned within ±10 degrees of the absorption axis of the linear polarizer, ensures improved transmittance by preventing overlap and optimizing liquid crystal alignment, with a slit-to-cell gap ratio ranging from 1.0 to 3.0 for enhanced alignment stability and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If protrusions or openings are formed on the pixel electrode or common electrode to achieve multi-domain vertical alignment, then liquid crystal alignment is improved, but the aperture ratio is deteriorated and transmittance is reduced
Solution Approach 1:
The pixel electrode is divided into multiple domains with different alignment directions. Each domain is controlled independently through separate electrode regions, allowing multi-domain vertical alignment to be achieved without requiring large protrusions or openings that would reduce the aperture ratio.
Solution Approach 2:
Different regions of the pixel electrode are given different alignment characteristics through localized electrode patterns. The alignment direction varies locally across the pixel, achieving multi-domain effect while maintaining overall high aperture ratio by avoiding large-scale structural modifications.
2Stability of the object's composition
If the width of slits is increased to enable proper liquid crystal alignment perpendicular to the slit direction, then alignment is improved, but the aperture ratio is further reduced
Solution Approach 1:
Instead of relying solely on slit width to control alignment, the invention uses the directional orientation of thin slits. The slits extend in a specific direction to guide liquid crystal alignment perpendicular to them, achieving effective alignment control without increasing slit width, thus maintaining high aperture ratio.
3Adaptability or versatility
If sub-pixel electrodes are divided by slits to improve viewing angle characteristics, then viewing angle is improved, but the aperture ratio of the MVA type LCD panel is decreased
Solution Approach 1:
The slits are designed with asymmetric positioning and orientation relative to the sub-pixel electrodes. This asymmetric configuration enables effective viewing angle improvement through multi-domain alignment while minimizing the total area occupied by slits, thereby maintaining high aperture ratio.
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 enhances transmittance, response speed, and alignment stability by ensuring sufficient liquid crystal alignment without reducing the aperture ratio, effectively addressing the limitations of existing MVA technologies.
Implementation Method 1
The liquid crystal material with a negative dielectric anisotropy filled between the two substrates is vertically aligned (VA)
Implementation Method 2
The electric field is generated in the direction perpendicular to the substrate when the voltage is applied to the electrode
Implementation Method 3
The implementation of cross-shaped slits on the common electrode, aligned within ±10 degrees of the absorption axis of the linear polarizer, ensures improved transmittance by preventing overlap and optimizing liquid crystal alignment
Data Source
AI summary
A liquid crystal display device is provided for not reducing the aperture ratio and improving transmittance. The liquid crystal display device comprises a substrate with a pixel electrode, a substrate with a common electrode, and a liquid crystal layer therebetween, wherein liquid crystal molecules of the liquid crystal layer are vertically aligned when no voltage is applied, each pixel comprises one or more sub-pixels, and cross-shaped slits are formed on the common electrode corresponding to each sub-pixel.