Multi-Width Connection Electrodes for Pixel Dark Spot Prevention
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Solution Overview
Problem
Display devices suffer from disconnection defects of light emitting elements and connection electrodes, leading to potential dark spots in pixels.
Innovation Solution
The display device incorporates a design with varying widths of connection electrodes and openings in insulating layers, ensuring proper contact and alignment with light emitting elements, thereby reducing disconnection defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform width connection electrodes and openings are used, then manufacturing is simpler, but disconnection defects occur between light emitting elements and connection electrodes
Solution Approach 1:
The connection electrode width is varied locally rather than uniformly: the first width in the first region is greater than the second width in the second region. This local variation ensures proper contact with light emitting elements of different widths while maintaining manufacturing feasibility, thereby resolving the contradiction between connection reliability and structural complexity.
Solution Approach 2:
The electrode width parameter is changed across different regions to match the varying widths of light emitting elements. By adjusting the width parameter from a uniform value to a variable value (first width > second width), the connection reliability is improved without requiring complete redesign of the entire electrode system.
2Reliability
If connection electrodes are made wider to ensure contact, then disconnection defects are reduced, but manufacturing precision requirements increase
Solution Approach 1:
Different regions have different electrode widths matched to the local light emitting element widths. The first region has a wider electrode for wider elements, and the second region has a narrower electrode for narrower elements, ensuring reliable contact in each local area without requiring excessive overall width that would increase alignment difficulty.
3Adaptability or versatility
If the electrode width varies significantly, then adaptability to different light emitting element widths is improved, but device complexity increases
Solution Approach 1:
The electrode structure implements local quality by having different widths in different regions (first width in first region, second width in second region). This allows the electrode to adapt to varying light emitting element widths while maintaining a relatively simple overall structure that can be manufactured using standard processes.
Data Source
AI summary
A display device includes: a first insulating layer on electrodes; a plurality of light emitting elements on the electrodes in an emission area; a second insulating layer on the first insulating layer and the light emitting elements and having a plurality of openings partially overlapping the electrodes and the light emitting elements; and a plurality of connection electrodes on at least some of the electrodes, contacting the light emitting elements, and partially overlapping the openings. A first opening has a first side portion and a second side portion opposite to the first side portion with a greater width than the first side portion, and a first connection electrode overlapping the first opening has a first portion overlapping the first opening and a second portion having a greater width than the first portion and that does not partially overlap the first opening.