LCD Common Electrode Patterned Openings for Viewing Angle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) in vertically aligned mode face challenges in achieving wide viewing angles with reduced side visibility, texture, and color loss phenomena, while maintaining high transmittance and grayscale accuracy.
Innovation Solution
The LCD design incorporates a common electrode with patterned openings corresponding to cruciform stem parts of pixel electrodes, featuring fine branch parts and strategically positioned cutouts to control liquid crystal alignment, enhancing visibility and transmittance by creating multiple domains with different alignment directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of domains are formed in one pixel to achieve wide viewing angle, then viewing angle is improved, but side visibility deteriorates
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode and second sub-pixel electrode) within one pixel. Each sub-pixel electrode applies different voltages to create distinct domains with different liquid crystal alignment directions. This segmentation allows the display to achieve wide viewing angles through multi-domain structure while maintaining good side visibility by controlling the specific alignment directions of each domain.
2Adaptability or versatility
If cut parts are formed in field generating electrode to create multiple domains, then viewing angle is improved, but transmittance deteriorates
Solution Approach 1:
Instead of forming cut parts in the field generating electrode which would reduce transmittance, the invention applies local quality by creating domain structures through voltage control on sub-pixel electrodes. The common electrode and alignment layers are designed with specific local properties (photopolymerization material distribution) to achieve the desired liquid crystal alignment without physical barriers that would block light.
3Object-affected harmful factors
If pixel is divided into two sub-pixels with different voltages to reduce side visibility, then side visibility is improved, but device complexity increases
Solution Approach 1:
The common electrode serves multiple functions: it provides the common voltage reference for both sub-pixels and, through its interaction with the photopolymerization material in alignment layers, helps define the domain structures. The alignment layers with photopolymerization material serve dual purposes of initial alignment and domain pattern definition, reducing the need for additional complex structures.
4Adaptability or versatility
If multiple domains are formed to achieve wide viewing angle, then viewing angle is improved, but color loss and grayscale agglomeration occur
Solution Approach 1:
The invention uses dynamic voltage control on sub-pixel electrodes to actively manage liquid crystal alignment in different domains. By independently controlling voltages on first and second sub-pixel electrodes, the system can dynamically adjust the alignment directions and domains to optimize both viewing angle and grayscale representation, preventing color loss and grayscale agglomeration through active domain management rather than fixed structural constraints.
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 design improves visibility, transmittance, and reduces color loss and agglomeration phenomena, achieving a wider viewing angle and quicker response speed with enhanced display quality.
Implementation Method 1
The LCD generates an electric field in the liquid crystal layer by applying a voltage to a field generating electrode
Implementation Method 2
controlling polarization of incident light based on the generated electric field
Implementation Method 3
at least one of the first alignment layer, the second alignment layer, and the liquid crystal layer may include a photopolymerization material
Data Source
AI summary
A liquid crystal display includes a first substrate, a plurality of pixel electrodes disposed on the first substrate and including a first sub-pixel electrode and a second sub-pixel electrode, the first sub-pixel electrode and the second sub-pixel electrode respectively including a cruciform stem part, and a plurality of fine branch parts which extends from the cruciform stem part, and a liquid crystal layer interposed between the first substrate and a second substrate facing the first substrate, the second substrate including a common electrode in which an opening corresponding to the cruciform stem part of the pixel electrode is defined.