Sub-Pixel Insulation Layout to Prevent Display Bright Spots
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Solution Overview
Problem
Display devices suffer from bright spot defects, which compromise their reliability and performance, due to issues with sub-pixel configuration and insulation layers in the non-emission areas.
Innovation Solution
A display device design featuring first, second, and third sub-pixels with specific electrode configurations, insulation layers, and light emitting elements, including a first insulating layer with openings, a second insulating layer with through holes, and a third insulating layer with contact holes, allowing for improved electrical connections and reduced short-circuit risks in the non-emission areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous insulating layers are formed over alignment electrodes in non-emission areas, then insulation is improved, but bright spot defects occur due to electrical discharge
Solution Approach 1:
The patent extracts the insulating layers (second and third insulating layers) from covering the alignment electrode in the non-emission area, creating openings and through holes that prevent electrical discharge while maintaining insulation in emission areas. This selective removal eliminates the bright spot defect caused by continuous insulation.
Solution Approach 2:
The patent applies different insulating structures to different areas: continuous insulating layers are maintained in emission areas where light emission is needed, while openings and through holes are created in non-emission areas to prevent electrical discharge. This local differentiation resolves the contradiction between insulation and bright spot prevention.
2Object-affected harmful factors
If alignment electrodes are exposed in non-emission areas, then bright spot defects are prevented, but electrical connection reliability may deteriorate
Solution Approach 1:
The patent creates a nested structure with multiple insulating layers (first, second, and third insulating layers) where the second and third layers have openings and through holes respectively. This nested arrangement allows the alignment electrode to be exposed only in non-emission areas while maintaining insulation and electrical connection in emission areas.
Solution Approach 2:
The patent uses vertical stacking of multiple insulating layers with different opening patterns to achieve both goals: the second insulating layer has openings to prevent bright spots, while the third insulating layer has through holes to maintain electrical connections. This multi-dimensional approach resolves the contradiction between exposure and connection reliability.
Data Source
AI summary
A display device including: a first sub-pixel, a second sub-pixel, and a third sub-pixel adjacent to each other, each of the first, second, and third sub-pixels including an emission area and a non-emission area, where each of the first, second, and third sub-pixels includes: a first alignment electrode and a second alignment electrode spaced from each other; a first insulating layer on the first alignment electrode and the second alignment electrode; light emitting elements on the first insulating layer on the first alignment electrode and the second alignment electrode in the emission area; a second insulating layer on the first insulating layer and the light emitting elements; and a third insulating layer on the second insulating layer, wherein the second and the third insulating layers are not on at least one area of the first alignment electrode in at least the non-emission area.