Micro-Slit Shielding Pattern for LCD Alignment
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Solution Overview
Problem
In liquid crystal display (LCD) panels with a vertically aligned (VA) mode, the alignment of patterned transparent electrodes is challenging, leading to potential misalignment and distortion of liquid crystal directors, which causes light leakage and decreased light transmittance, affecting display quality.
Innovation Solution
A display substrate with micro-slit patterns and shielding patterns is used, where micro-electrodes are separated by slits and interconnected by shielding patterns that overlap with gate lines, preventing distortion of liquid crystal directors and minimizing light leakage and image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If patterned transparent electrodes are used to improve viewing angle, then display quality is improved, but alignment difficulty increases leading to potential misalignment
Solution Approach 1:
A shielding pattern is introduced as an intermediary element between the patterned pixel electrode and the liquid crystal layer. This shielding pattern acts as a mediator that compensates for alignment errors by preventing electric field leakage at the edges of misaligned micro-electrodes, thus maintaining display quality even when perfect alignment is not achieved.
2Reliability
If slit patterns are formed to prevent misalignment, then alignment tolerance is improved, but liquid crystal director distortion increases causing light leakage
Solution Approach 1:
The shielding pattern serves as an intermediary structure that fills the gap between the slit pattern's micro-electrodes and the liquid crystal layer. It prevents the electric field from leaking through the slits and distorting the liquid crystal directors, thereby eliminating light leakage while preserving the alignment tolerance benefits of the slit pattern.
Solution Approach 2:
The shielding pattern converts the potentially harmful electric field leakage that occurs at the edges of slit patterns into a beneficial containment effect. By blocking the leakage, the shielding pattern transforms what would be a source of light leakage and director distortion into a protective barrier that improves overall display performance.
3Ease of manufacture
If micro-slit patterns are used to simplify electrode patterning, then manufacturing complexity is reduced, but liquid crystal director distortion occurs leading to decreased light transmittance
Solution Approach 1:
The shielding pattern is positioned between the micro-slit patterned electrode and the liquid crystal layer to act as an intermediary. It prevents the electric field from the micro-electrodes from directly interacting with and distorting the liquid crystal directors, thereby maintaining high light transmittance while preserving the manufacturing simplicity of the micro-slit pattern approach.
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
The solution effectively suppresses distortion of liquid crystal directors, improving display quality by preventing light leakage and maintaining high light transmittance, thus enhancing the viewing experience of LCD panels.
Implementation Method 1
a first shielding pattern interconnecting end portions of two or more of the micro-electrodes of one of said one or more micro-slit patterns, the end portions overlapping with one of the gate lines
Data Source
AI summary
A display substrate comprises gate lines, data lines intersecting the gate lines, and a pixel electrode connected to at least one of the gate lines and at least one of the data lines. The pixel electrode comprises one or more micro-slit patterns each of which comprises a plurality of micro-electrodes separated by slits. The pixel electrode comprises a first shielding pattern interconnecting end portions of two or more of the micro-electrodes of one of the one or more micro-slit patterns, the end portions overlapping with one of the gate lines.