LCD Link Unit Resistance Compensation via Contact Hole Design
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Solution Overview
Problem
In liquid crystal display devices (LCDs), resistance variations in link units due to differing lengths of signal lines lead to distorted gate and data signals, degrading image quality by applying different initial bias voltages and increasing resistances from the center to the edge region, which affects the uniformity of common voltage in IPS LCDs.
Innovation Solution
The solution involves forming electrode patterns and setting contact holes differently between signal lines and circuit lines to achieve equiresistance, adjusting the number or size of contact holes to minimize resistance variations, ensuring uniform signal transmission across the LCD panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased for high-resolution display, then the resolution is improved, but the line widths and distances between lines decrease to a fine level, causing resistance variations in link units
Solution Approach 1:
The patent applies local quality by making the link unit structure position-dependent. Link units closer to the center have different configurations (fewer contact holes, smaller area) compared to those at the edges (more contact holes, larger area). This local differentiation compensates for the resistance variations caused by fine line dimensions in high-resolution displays, ensuring uniform voltage distribution across the panel.
2Reliability
If electrode links are positioned to connect electrode pads to signal lines, then electrical connection is achieved, but gate lines have different lengths and thus different resistances
Solution Approach 1:
The patent changes the parameters of the link unit (number of contact holes, contact hole area, link unit width) based on position. Link units are designed with position-dependent parameters where central link units have fewer and smaller contact holes, while peripheral link units have more and larger contact holes. This parameter variation compensates for the resistance differences caused by varying gate line lengths, maintaining consistent voltage distribution.
3Ease of manufacture
If link units are designed with uniform structure, then manufacturing is simplified, but resistance variations occur from center to edge region affecting common voltage uniformity
Solution Approach 1:
The patent implements local quality by designing link units with position-dependent characteristics. The structure, size, and number of contact holes vary according to the link unit's position on the panel. This local differentiation ensures that resistance from the center to edge is compensated, maintaining uniform common voltage distribution while managing the complexity through systematic variation rather than completely arbitrary design.
Data Source
AI summary
Provided is an LCD capable of compensating for a resistance variation in a link unit. The resistance variations in the gate lines, data lines and common lines are reduced to minimize the signal distortion in the LCD. Accordingly, it is possible to enhance the image quality characteristics of the LCD. The resistance variation can be reduced by adjusting the number or the size of contact holes in the link unit.