Pixel Structure Preventing Short-Circuit in HMD
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Solution Overview
Problem
The challenge in developing a high-resolution head-mount display is the difficulty in preventing short-circuiting of the conductive structure in pixels due to the limitations of manufacturing processes as gaps become smaller, making it hard to achieve a thin, light, and high-resolution design.
Innovation Solution
A pixel structure is designed with a common electrode and insulating layers that create a sufficient gap between the common opening and contact holes of adjacent pixel units, preventing short-circuiting by ensuring the common electrode is electrically insulated from the pixel electrodes and maintaining a large enough distance to avoid contact with the drains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to improve resolution, then display resolution is improved, but manufacturing precision deteriorates due to short-circuiting risks
Solution Approach 1:
The pixel structure is divided into separate functional regions: pixel electrodes are positioned in first and second contact holes, while the common electrode is positioned in a third contact hole, physically separating conductive paths to prevent short-circuiting. This segmentation allows smaller pixel sizes without compromising manufacturing precision.
Solution Approach 2:
Different regions of the pixel structure have different electrode configurations: pixel electrodes in first/second contact holes versus common electrode in third contact hole. This local differentiation ensures proper electrical isolation while maintaining high resolution, addressing the contradiction between small pixel size and manufacturing precision.
2Length of moving object
If gap between conductive structures is reduced to decrease pixel width, then device size is reduced, but reliability deteriorates due to short-circuiting
Solution Approach 1:
The contact holes are segmented into different types: first and second contact holes for pixel electrodes, and a third contact hole for the common electrode. This segmentation creates inherent electrical isolation that maintains reliability even when pixel width is reduced.
Solution Approach 2:
The electrode isolation is achieved not only through horizontal spacing but also through vertical layering and contact hole positioning. The common electrode in the third contact hole is positioned differently from pixel electrodes, creating multi-dimensional separation that prevents short-circuiting while allowing smaller pixel dimensions.
Data Source
AI summary
A pixel structure including a first pixel unit, a second pixel unit, a first insulating layer, and a common electrode is provided. The first and second pixel units are disposed on a substrate, and includes a first drain and a first pixel electrode, and a second drain and a second pixel electrode, respectively. The first insulating layer covers the first and second drains. The first and second pixel electrodes are disposed on the first insulating layer, and the first insulating layer has first and second contact holes uncovering the first and second drains, respectively. The common electrode is disposed on the first insulating layer, and is electrically insulated from the first and second pixel electrodes, and has a common opening. When projected onto the substrate, the first and second contact holes are disposed within a region of the common opening.