LCD Pixel Electrodes with Minute Branches for Alignment Control
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Solution Overview
Problem
Current liquid crystal display (LCD) devices face challenges in achieving optimal display quality due to limitations in the structure of pixel electrodes, which affect transmittance and uniformity of the liquid crystal molecules' alignment and response speed.
Innovation Solution
The proposed LCD device features a pixel electrode structure with minute branches and connecting branches arranged in specific patterns on the substrate, including edge and main areas with distinct angles, to enhance control over liquid crystal molecules and improve transmittance and uniformity, allowing for faster realignment and reduced afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pixel electrode structures are used, then manufacturing is simpler, but display quality is insufficient due to poor liquid crystal molecule alignment control
Solution Approach 1:
The pixel electrode is divided into multiple minute branches (first through fourth minute branches) with different orientations. Each branch is segmented to control liquid crystal molecule alignment in specific regions, improving overall alignment uniformity while maintaining manufacturability through standardized fabrication processes.
Solution Approach 2:
Different regions of the pixel electrode have different local structures. The first and second minute branches have first orientations while the third and fourth minute branches have second orientations, creating local quality variations that optimize liquid crystal alignment in different areas of the pixel.
2Productivity
If pixel electrode structure is simplified, then manufacturing is easier, but transmittance and response speed are reduced
Solution Approach 1:
By segmenting the pixel electrode into multiple oriented branches, the structure achieves faster liquid crystal realignment through optimized electric field distribution, improving response speed despite increased structural complexity.
Solution Approach 2:
The pixel electrode structure transitions from a simple planar design to a multi-dimensional branched configuration with different orientations, enabling control over liquid crystal molecules in multiple directions simultaneously, thereby enhancing response speed.
3Reliability
If conventional pixel electrode design is used, then device complexity is lower, but afterimage reduction is insufficient
Solution Approach 1:
The segmented minute branch structure creates multiple electric field regions that work together to reduce afterimages by optimizing the switching characteristics of liquid crystal molecules, improving reliability despite structural complexity.
Solution Approach 2:
The asymmetric arrangement of minute branches with different orientations creates non-uniform electric field distributions that help reduce afterimage effects by optimizing charge storage and release characteristics during pixel switching.
4Manufacturing precision
If minute branches are arranged with uniform angles, then manufacturing is simpler, but alignment control is insufficient
Solution Approach 1:
Different regions have different angular orientations for the minute branches. The first and second minute branches have first orientations while the third and fourth have second orientations, providing precise alignment control in different regions despite increased manufacturing complexity.
Data Source
AI summary
A liquid crystal display device includes first and second substrates opposite to each other, a liquid crystal layer between the first and second substrates, a first electrode on the first substrate in a planar shape, and a second electrode on the first substrate and including pixel electrodes, which overlap the first electrode. Each of the pixel electrodes includes minute branches disposed parallel to one another, and connecting branches, which connect the minute branches, the minute branches include an edge area defined on a side thereof, and a main area defined by a remaining area, the connecting branches are disposed alternately on outer sides of the edge and main areas, and a first angle formed by the minute branches in the edge area with respect to a first direction is larger than a second angle formed by the minute branches in the main area with respect to the first direction.