Zigzag Data Line Pattern for LCD Rubbing Defect Reduction
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Solution Overview
Problem
Rubbing defects in the stepped regions of data lines during the liquid crystal alignment process in LCD devices lead to abnormal liquid crystal alignment and light leakage, particularly when the rubbing direction forms an acute angle with the data line, affecting the aperture ratio and efficiency.
Innovation Solution
The data line structure is modified with a zigzag or saw-toothed pattern, featuring first lateral patterns parallel to the rubbing direction and second lateral patterns perpendicular to it, to minimize the rubbing defect by adjusting the angle between the rubbing direction and the data line to be between 0 and 20 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubbing direction is set at an acute angle to the data line to achieve proper liquid crystal alignment, then the liquid crystal alignment is improved, but rubbing defects occur in the stepped region of the data line causing abnormal alignment and light leakage
Solution Approach 1:
The patent applies local quality by creating a lateral pattern portion only in the stepped region of the data line where rubbing defects occur, while leaving the rest of the data line structure unchanged. This localized modification specifically addresses the rubbing defect problem in the critical area without affecting the overall device structure or other functional regions.
Solution Approach 2:
The lateral pattern portion is designed with an asymmetric zigzag structure that is not symmetric with respect to the data line. This asymmetric pattern creates different surface characteristics on different sides of the data line, which helps control the rubbing direction and prevents abnormal liquid crystal alignment in the stepped region while maintaining proper alignment elsewhere.
2Reliability
If the shape of pixel is deformed to solve rubbing defect, then the rubbing defect is reduced, but the aperture ratio and efficiency per area are reduced
Solution Approach 1:
Instead of deforming the entire pixel structure, the patent applies a lateral pattern portion only locally in the stepped region of the data line. This localized approach solves the rubbing defect without requiring changes to the overall pixel shape, thereby maintaining the aperture ratio and efficiency per area.
Solution Approach 2:
The data line is segmented into different regions: a first region with a substantially flat surface and a second region (stepped region) with the lateral pattern portion. This segmentation allows the patent to apply different surface characteristics to different parts of the data line, solving the rubbing defect in the stepped region while maintaining the original pixel structure in other regions.
3Reliability
If a lateral pattern portion is formed on the data line to reduce rubbing defect, then the rubbing defect is decreased, but the device structure becomes more complex
Solution Approach 1:
The lateral pattern portion is formed only in the stepped region of the data line where rubbing defects occur, rather than modifying the entire data line structure. This localized modification minimizes the increase in device complexity by affecting only the necessary region while maintaining the simplicity of the overall data line structure.
Solution Approach 2:
The data line is divided into a first region with a flat surface and a second region with the lateral pattern portion. This segmentation allows the patent to add complexity only where necessary (in the stepped region) while keeping the rest of the data line simple, thus minimizing the overall increase in device complexity.
Data Source
AI summary
Disclosed is a liquid crystal display device comprising a lower substrate, an upper substrate, and a liquid crystal layer interposed between the substrates and aligned in a predetermined rubbing direction, in which pixel regions are respectively defined by gate lines and data lines formed to intersect each other on the lower substrate, and a switching device is arranged in an intersecting portion of the gate line and the data line, the liquid crystal display device comprising: a lateral pattern portion formed on at least one side of the data line and formed zigzagging along an extending direction of the data line. With this, it is possible to effectively improve and prevent the rubbing defect that occurs in the stepped region of the data line during the rubbing process for alignment of liquid crystal.