Pixel Electrode Stem and Branch Design for Curved LCD Alignment
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Solution Overview
Problem
Liquid crystal display (LCD) devices face misalignment issues when curved, leading to texture and transmittance degradation due to irregular movements of liquid crystal molecules near the electrode structures, particularly at the junctions of stem and branch portions.
Innovation Solution
The design of a pixel electrode with a stem portion and inclined branch portions, including protrusion and parallel portions, which are strategically arranged to align liquid crystal molecules and mitigate fringe field effects, thereby preventing misalignment and transmittance degradation even in curved displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel electrode structure is used, then the device structure is simple, but misalignment and texture occur when curved leading to transmittance degradation
Solution Approach 1:
The pixel electrode is divided into multiple independent conductive patterns including a stem portion, multiple branch portions extending in different directions, and sub-branch portions. This segmentation allows each portion to independently manage liquid crystal alignment in its local region, preventing misalignment and texture when the display is curved while maintaining overall structural functionality.
2Reliability
If the pixel electrode has a simple structure, then manufacturing is easier, but liquid crystal molecules near electrode structures show irregular movements causing transmittance degradation
Solution Approach 1:
Different portions of the pixel electrode are designed with different geometries and orientations to address local alignment needs. The stem portion extends in a first direction, branch portions extend in a second direction intersecting the first direction, and sub-branch portions extend in a third direction intersecting both previous directions. This local quality variation ensures uniform transmittance by preventing irregular liquid crystal movements in different regions of the pixel area.
3Reliability
If conventional alignment methods are used, then the alignment layer can align liquid crystal molecules uniformly, but misalignment occurs at junctions of stem and branch portions when curved
Solution Approach 1:
The pixel electrode employs an asymmetric multi-directional pattern with a stem portion, branch portions, and sub-branch portions extending in different directions (first, second, and third directions respectively). This asymmetric design creates balanced fringe field distribution at junctions, preventing misalignment when the display is curved while maintaining uniform alignment across the entire pixel area.
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 viewing angle properties and prevents alignment defects in curved LCD devices, improving side visibility and reducing transmittance degradation by effectively managing liquid crystal molecule alignment across different domains.
Implementation Method 1
Upon applying voltage to the electrodes, the LCD device rearranges liquid crystal molecules of the liquid crystal layer such that an amount of transmitted light is controlled
Data Source
AI summary
A display substrate may include a base substrate having a plurality of pixel areas; and a pixel electrode in each of the pixel areas. The pixel electrode may include a vertical stem portion extending in a first direction; a horizontal stem portion extending from the vertical stem portion in a second direction intersecting the first direction; a plurality of main branch portions extending from at least one of the vertical stem portion and the horizontal stem portion in an inclined manner; and a sub-branch portion extending from at least one of the plurality of main branch portions.