Display Pixel Insulating Dummy Pattern for Electrode Isolation
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Solution Overview
Problem
Display devices face reliability issues due to short-circuiting between electrodes, which affects the performance and longevity of light emitting elements.
Innovation Solution
A display device design featuring a dummy pattern made of inorganic and organic insulating materials, strategically placed between electrodes to prevent short-circuiting, along with a method of fabricating this structure using specific layers and etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy pattern is added between the first insulating layer and the light emitting element, then reliability is improved by preventing short-circuiting, but device complexity increases
Solution Approach 1:
The dummy pattern acts as an intermediary insulating structure positioned between the first insulating layer and the light emitting element. This intermediate element provides additional electrical isolation to prevent short-circuiting between electrodes while maintaining a systematic layered architecture that integrates seamlessly with existing device components.
Solution Approach 2:
The dummy pattern is formed in advance during the fabrication process, specifically between the formation of the first insulating layer and the light emitting element. This preliminary placement ensures that potential short-circuit paths are blocked before subsequent layers are added, proactively preventing reliability issues before they can manifest.
2Manufacturing precision
If multiple dummy layers are stacked to fill the space, then manufacturing precision is improved by ensuring complete coverage, but ease of manufacture decreases
Solution Approach 1:
The dummy pattern is divided into multiple discrete layers (first dummy layer, second dummy layer, third dummy layer) that are stacked sequentially. Each layer can be formed using standard fabrication processes independently, allowing precise control over the filling of the space between structural elements while maintaining compatibility with existing manufacturing capabilities.
Solution Approach 2:
The dummy pattern extends into the vertical dimension by stacking multiple layers, effectively filling the three-dimensional space between the first insulating layer and the light emitting element. This vertical segmentation ensures complete coverage of the gap area without requiring complex lateral patterning adjustments.
Data Source
AI summary
A display device may include pixels on a substrate. Each of the pixels may include: a first alignment electrode and a second alignment electrode located on the substrate and spaced from each other; a first insulating layer on the first alignment electrode and the second alignment electrode; a light emitting element located on the first insulating layer between the first and second alignment electrodes; a dummy pattern located between the first insulating layer and the light emitting element; a second insulating layer located on the light emitting element and exposing first and second ends of the light emitting element; a first electrode electrically connected to the first end of the light emitting element; and a second electrode spaced from the first electrode, and electrically connected to the second end of the light emitting element. The dummy pattern may include a same material as the second insulating layer.