Liquid Crystal Display Link Line Width Variation
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Solution Overview
Problem
The existing liquid crystal display devices experience image quality degradation due to resistance differences between link lines, which necessitate costly compensation patterns to address these differences.
Innovation Solution
A liquid crystal panel design featuring a matrix display unit with pad units and link units where connection pads and link lines have varying widths to minimize resistance differences, with driving integrated circuits mounted on output pads to drive the panel, ensuring that the widths of output pads and link lines are proportionate to each other to compensate for length differences without additional compensation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If link lines are formed in the non-display area to connect output pads to data lines, then signal transmission is enabled, but resistance differences occur between link lines causing image quality degradation
Solution Approach 1:
The patent applies local quality by making the widths of different link lines different according to their respective positions and lengths. Specifically, link lines in the first and third regions are designed with larger widths than those in the second region, compensating for the longer paths in outer regions. This localized variation in geometry ensures uniform resistance across all link lines, resolving the contradiction between enabling signal transmission and maintaining resistance uniformity.
2Manufacturing precision
If compensation patterns are added to address resistance differences, then image quality improves, but manufacturing costs increase
Solution Approach 1:
The patent applies parameter changes by directly modifying the geometric parameters (widths) of the link lines themselves rather than adding separate compensation patterns. By designing link lines with different widths based on their positions and lengths, the resistance differences are compensated for inherently, eliminating the need for additional compensation patterns and reducing manufacturing complexity and cost.
3Ease of operation
If link lines have different lengths due to pad positioning, then connectivity is achieved, but resistance differences cause signal distortion
Solution Approach 1:
The patent applies asymmetry by intentionally designing link lines with different widths according to their asymmetric positions in the data TCP. Link lines in the first and third regions (outer regions) have larger widths than those in the second region (central region), compensating for the asymmetric length differences. This asymmetric design ensures that despite different lengths, all link lines have substantially equal resistance, preventing signal distortion while maintaining connectivity.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel including a display unit in which pixels are provided in the form of a matrix and a plurality of pad units provided at a peripheral portion in at least one side of the display unit and including a plurality of connection pads having widths different from each other, and a tape carrier package including a plurality of output pads corresponding to the plurality of pad units, in which driving integrated circuits are mounted on the output pads to drive the liquid crystal panel, and the output pads have widths different from each other corresponding to the plurality of connection pads.