Light-Emitting Display Electrode Layout to Prevent Short Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face issues with short-circuit failures due to the formation of spaces between light-emitting elements and passivation layers, which can lead to electrical shorts during the fabrication of connection electrodes.
Innovation Solution
A display device design that incorporates a protrusion and insulating pattern under the light-emitting elements to eliminate the space between them and the passivation layer, using the protrusion and pattern to form a uniform thickness and prevent electrical shorts by aligning the light-emitting elements with the protrusion and insulating pattern, thereby reducing the likelihood of short-circuit failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flat structure is used without protrusion, then the fabrication process is simpler, but spaces form between light-emitting elements and passivation layers causing short-circuit failures
Solution Approach 1:
A protrusion is formed in the via layer before forming the passivation layer, creating a pre-positioned structure that eliminates spaces between light-emitting elements and passivation layers. This preliminary structural preparation prevents short-circuit failures during subsequent fabrication processes without requiring complex real-time adjustments.
Solution Approach 2:
The via layer is transformed from a flat two-dimensional structure to a three-dimensional structure with a protrusion extending upward. This dimensional change creates a stepped configuration that eliminates gaps and ensures uniform contact between the passivation layer and substrate, preventing short-circuit paths.
2Reliability
If the via layer is made thicker to prevent shorts, then short-circuit resistance improves, but the overall device thickness increases
Solution Approach 1:
The via layer is segmented into two distinct regions: a thicker protrusion region providing enhanced electrical insulation and short-circuit prevention, and a thinner peripheral region maintaining overall device thinness. This segmentation allows differential thickness optimization for different functional requirements within the same layer.
Solution Approach 2:
The via layer exhibits non-uniform thickness with a localized protrusion having greater thickness for insulation purposes, while the surrounding areas maintain minimal thickness. This local quality variation ensures electrical insulation is enhanced precisely where needed (under light-emitting elements) without unnecessarily increasing overall device thickness.
Data Source
AI summary
A display device includes a substrate, a via layer above the substrate, and including a protrusion, an insulating pattern above the protrusion, and having a width that is greater than a width of the protrusion, first and second electrodes above the via layer, and spaced apart from each other with the protrusion and the insulating pattern therebetween, a first insulating layer above the protrusion, the insulating pattern, the first electrode, and the second electrode, a light-emitting element above the first insulating layer, and between the first electrode and the second electrode, a first connection electrode connected to a first end of the light-emitting element, and a second connection electrode connected to a second end of the light-emitting element.