Liquid Crystal Display Contact-Hole Layout for Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices suffer from display unevenness caused by orientation films around contact holes, which current techniques have not adequately addressed.
Innovation Solution
The display device design includes an array substrate with specific arrangements of signal and scanning lines, organic insulating films, and contact conductive layers, where contact holes are deviated from each other in a particular direction, and at least a part of the contact region of the second contact conductive layer is covered by a second organic insulating film, enhancing the suppression of display unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed in organic insulating films for electrical coupling, then electrical connectivity is achieved, but display unevenness occurs due to orientation film distortion around contact holes
Solution Approach 1:
The patent applies the dimensionality change principle by forming contact holes at different positions in the first and second directions. Specifically, the first contact hole is positioned at a first position in the first direction relative to the pixel electrode, while the second contact hole is positioned at a second position in the second direction. This spatial distribution across different dimensions reduces the concentration of orientation film distortion at single points, thereby suppressing display unevenness while maintaining necessary electrical connectivity through multiple contact pathways.
2Reliability
If multiple contact holes are formed to reduce parasitic capacitance, then electrical performance improves, but display unevenness from orientation films increases
Solution Approach 1:
The patent employs asymmetry by intentionally positioning contact holes at asymmetric locations relative to the pixel electrode. The first contact hole is offset in the first direction while the second contact hole is offset in the second direction, creating an asymmetric distribution pattern. This asymmetric arrangement prevents the formation of symmetric distortion patterns in the orientation film that would cause visible display unevenness, while still achieving the goal of reducing parasitic capacitance through multiple contact points.
3Area of stationary object
If contact holes are positioned closer to pixel electrodes to reduce wiring length, then device area decreases, but orientation film impact on display quality increases
Solution Approach 1:
The patent applies segmentation by dividing the contact hole formation into multiple separate contact holes rather than using a single centralized contact structure. The first and second contact holes are distributed at different positions, which segments the orientation film distortion impact across multiple locations rather than concentrating it. This segmentation allows for reduced wiring length and compact device area while maintaining display quality by preventing severe localized distortion.
Data Source
AI summary
A display device comprising: an array substrate; a counter substrate provided with color filters; and a liquid crystal layer between the array substrate and the counter substrate; wherein one surface of the array substrate includes a plurality of signal lines arranged side by side in a first direction with a gap interposed therebetween, a plurality of scanning lines arranged side by side in a second direction with a gap interposed therebetween, a first organic insulating film provided on the signal lines, and a second organic insulating film provided on the first organic insulating film; and each region surrounded by the corresponding scanning line and the corresponding signal line includes a semiconductor layer, a first contact conductive layer, a second contact conductive layer, and a first electrode.