LCD Light-Shielding Line for Disclination and Leakage
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Solution Overview
Problem
Existing LCD devices with improved viewing angles suffer from disclination at the bent portions of pixel electrodes, leading to deteriorated picture quality due to light leakage and increased resistance in the common electrode.
Innovation Solution
Incorporating a light-shielding line in the interfacial portion between the domains of the pixel electrode to prevent light leakage and reduce the resistance of the common electrode by using conductive lines that intersect and overlap with the data and gate lines, while also addressing alignment defects during the rubbing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel electrode is bent to divide the pixel region into two domains, then the viewing angle property is improved, but disclination occurs in the bent portion causing picture quality deterioration
Solution Approach 1:
The pixel electrode is divided into two distinct domains separated by a bent portion, with each domain having different alignment directions. This segmentation allows different viewing angle characteristics in different regions, improving overall viewing angle performance while the light-shielding line prevents disclination at the interface
Solution Approach 2:
A light-shielding line is introduced as an intermediary element at the bent portion of the pixel electrode. This light-shielding line blocks light leakage from the disclination region and serves as a mediator between the two domains with different alignment directions, preventing picture quality deterioration while maintaining the divided domain structure
2Reliability
If the common electrode is extended to the edge of the substrate, then the resistance is reduced, but alignment defects occur during the rubbing process
Solution Approach 1:
The common electrode is segmented into multiple regions: a first common electrode extending to the substrate edge for low resistance, and a second common electrode positioned away from the edge. This segmentation allows the first region to provide low resistance while the second region avoids alignment defects during rubbing
Solution Approach 2:
Different regions of the common electrode are assigned different functions: the first common electrode near the edge is optimized for electrical conductivity (low resistance), while the second common electrode away from the edge is optimized for alignment quality during the rubbing process. This local quality differentiation resolves the contradiction between resistance and alignment precision
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 prevents light leakage and reduces the resistance of the common electrode, enhancing picture quality and viewing angles while minimizing alignment defects during the rubbing process.
Implementation Method 1
a light-shielding line which is formed in the interfacial portion between the domains so as to prevent light leakage therethrough
Implementation Method 2
As an electric field is formed between the pixel electrode 50 and a common electrode (not shown), liquid crystal is driven
Data Source
AI summary
Disclosed is an LCD device which facilitates to prevent light leakage by forming a light-shielding line in a disclination-occurring portion of a pixel region, that is, a portion along the interface between divided domains in the pixel region, wherein the LCD device comprises gate and data lines which are formed on a substrate while intersecting each other to define a pixel region; a pixel electrode which is formed in the pixel region, and is divided into at least two domains; a common electrode which is patterned to generate an electric field together with the pixel electrode; and a light-shielding line which is formed in the interfacial portion between the domains so as to prevent light leakage therethrough.