LCD Pixel Electrode Connecting Network for Viewing Angle
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face challenges in achieving improved visibility and transmittance, particularly in maintaining wide viewing angles and preventing texture distortions due to irregular liquid crystal molecule alignment caused by electrode patterns.
Innovation Solution
The implementation of a connecting electrode system where unit pixel electrodes are connected through a network of stem electrodes, micro-branch parts, and slit patterns, with a protrusion on the connecting electrode, allows for controlled liquid crystal molecule alignment across domains, enhancing visibility and transmittance by minimizing irregular alignments and texture distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If incision parts or protrusions are formed in field generating electrodes to create multiple domains, then viewing angle is improved, but texture distortions and irregular liquid crystal alignment occur
Solution Approach 1:
The pixel electrode is divided into multiple unit pixel electrodes (first, second, third, fourth unit pixel electrodes) arranged in a matrix pattern. Each unit pixel electrode is further divided into multiple domains by stem electrodes and micro-branch parts. This segmentation allows different regions to have different liquid crystal alignment directions, improving viewing angle while maintaining uniform alignment through controlled domain structures.
Solution Approach 2:
Different regions of the pixel electrode are assigned different functions: unit pixel electrodes for light modulation, stem electrodes for domain division, micro-branch parts for liquid crystal alignment control, and connecting electrodes for electrical connection. The connecting electrode is specifically positioned in the corner region where it does not interfere with the alignment-controlled regions, ensuring each area contributes to both viewing angle improvement and alignment uniformity.
2Ease of operation
If connecting electrode is positioned to connect unit pixel electrodes, then electrical connectivity is achieved, but liquid crystal alignment and visibility are compromised
Solution Approach 1:
The connecting electrode function is extracted and positioned separately in the corner region where corners of unit pixel electrodes face each other. This location was previously unused and does not interfere with the liquid crystal alignment patterns formed by stem electrodes and micro-branch parts. The connecting electrode connects to micro-branch parts through extension electrodes, achieving electrical connectivity without compromising visibility or transmittance in the active display regions.
3Adaptability or versatility
If micro-branch parts with multiple domains are formed, then viewing angle is enhanced, but device complexity increases
Solution Approach 1:
Multiple functions are merged into integrated structures: stem electrodes serve both as domain dividers and alignment controllers; micro-branch parts combine branching patterns with slit patterns to achieve both domain formation and liquid crystal orientation control; connecting electrodes are integrated with extension electrodes that connect to micro-branch parts. This merging reduces the number of separate components while maintaining the multi-domain viewing angle enhancement.
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 improves the LCD's visibility and transmittance by ensuring consistent liquid crystal molecule directionality across the display, reducing texture distortions and maintaining high transmittance even at wide viewing angles.
Implementation Method 1
a connecting electrode which connects the unit pixel electrodes to each other
Implementation Method 2
voltages are applied to field generating electrodes to generate an electric field in a liquid crystal layer
Implementation Method 3
the alignment of liquid crystal molecules of the liquid crystal layer is determined, and polarization of incident light is controlled
Data Source
AI summary
A liquid crystal display (“LCD”) includes: a substrate on which a pixel region is defined; and a pixel electrode which is disposed in the pixel region on the substrate. The pixel electrode includes: a plurality of unit pixel electrodes which are arranged substantially in a matrix form; and a connecting electrode which connects the unit pixel electrodes to each other. Neighboring unit pixel electrodes adjacent to each other in a column direction are separated from each other by a first in-between area extending along a row direction, neighboring unit pixel electrodes adjacent to each other in the row direction are separated from each other by a second in-between area extending along the column direction, and the connecting electrode is disposed in a region in which corners of the unit pixel electrodes face each other.