Liquid Crystal Display Contact Hole Spacing for Aperture Ratio
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Solution Overview
Problem
The aperture ratio of liquid crystal displays is reduced due to contact holes for connecting common electrodes to common voltage lines, which also cause signal delays.
Innovation Solution
The design includes a substrate with common voltage lines and insulating layers having contact holes that expose parts of the common voltage lines, with adjacent contact holes spaced apart by at least one pixel, allowing for improved connection and reduced signal delay while maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are provided to connect common electrode to common voltage line, then signal delay is reduced, but aperture ratio is reduced
Solution Approach 1:
The patent divides the contact hole arrangement into segments spaced at specific intervals (e.g., every 3rd pixel, or at pixel corners) rather than continuous coverage. This segmentation allows signal connection while preserving aperture ratio by leaving gaps between contact holes.
Solution Approach 2:
The patent applies different structures to different locations: contact holes are provided only at specific pixel positions (e.g., corner pixels or every nth pixel) rather than uniformly across all pixels. This local differentiation maintains aperture ratio while ensuring signal transmission where needed.
2Reliability
If contact holes are provided for common voltage line connection, then electrical connectivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the contact hole function with existing pixel structures by positioning contact holes at pixel corners or integrating them with pixel electrode patterns. This merging approach ensures electrical connectivity while utilizing existing manufacturing steps rather than adding separate complex processes.
Data Source
AI summary
A liquid crystal display comprising: a substrate; a plurality of common voltage lines disposed on the substrate; an insulating layer disposed on the common voltage lines; and a common electrode and a plurality of pixel electrodes disposed on the insulating layer, the plurality of pixel electrodes constituting a plurality of pixel electrodes, respectively, wherein the insulating layer comprises a plurality of contact holes to expose at least part of the common voltage lines, and wherein two adjacent contact holes among the plurality of contact holes are spaced apart by at least one pixel therebetween.