Display Pixel Insulating Openings for Outgassing Defect Relief
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Solution Overview
Problem
Display devices face defects due to outgassing during the fabrication process, which can lead to reduced performance and efficiency of light emitting elements.
Innovation Solution
The display device incorporates a substrate with pixels, banks, electrodes, and insulating layers, including first, second, and third openings that overlap the banks, allowing for the discharge of outgases and minimizing defects by providing pathways for gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating layers are added to cover banks and electrodes, then electrical insulation and structural integrity are improved, but outgassing during fabrication causes defects and reduces light emitting element performance
Solution Approach 1:
The patent introduces openings (first opening through first insulating layer, second opening through second insulating layer, and third opening through second and third insulating layers) that create porous pathways through the insulating layer structure. These openings allow outgases to escape during fabrication while maintaining the electrical insulation function of the insulating layers, thus resolving the contradiction between insulation reliability and outgassing prevention.
Solution Approach 2:
The patent extracts the harmful outgases from the fabrication environment by providing dedicated escape pathways (openings) through the insulating layers. By removing the outgases that would otherwise cause defects, the patent maintains both the insulation function and prevents outgassing-related performance degradation of light emitting elements.
2Stability of the object's composition
If multiple insulating layers are used to ensure proper alignment and operation of light emitting elements, then structural integrity is improved, but complexity of the device increases
Solution Approach 1:
The patent divides the insulating structure into multiple separate insulating layers (first, second, and third insulating layers) with corresponding openings at different positions. This segmentation allows each layer to serve specific functions: providing insulation, allowing outgas escape, and maintaining alignment. The segmented structure manages complexity by assigning specific roles to each layer rather than using a single complex layer.
Solution Approach 2:
The patent implements a nested structure where openings in different insulating layers are positioned to overlap or align, creating a hierarchical pathway system. The first opening through the first insulating layer, second opening through the second insulating layer, and third opening through the second and third insulating layers are nested to provide progressive outgas escape routes while maintaining structural integrity at each level.
Data Source
AI summary
A display device may include a substrate including pixels; a first bank that defines an emission area of the pixels; a first electrode and a second electrode spaced apart from each other in the emission area; a first insulating layer disposed on the first electrode and the second electrode; light emitting elements disposed on the first insulating layer between the first electrode and the second electrode; a second insulating layer disposed on the first bank; a first opening passing through the first insulating layer; and a second opening passing through the second insulating layer. The first opening and the second opening may overlap the first bank.