Display Electrode Layout for Removing Misplaced Light Emitters
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Solution Overview
Problem
The existing display devices face issues due to step differences in common electrodes caused by light emitting elements being misplaced outside emission areas, leading to disconnection and reduced reliability.
Innovation Solution
A display device design where light emitting elements are only disposed in emission areas by removing those outside, using a bank structure with an insulating layer and a via layer to ensure proper electrode contact, preventing step differences and disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are disposed in an area other than emission area, then manufacturing process is simplified, but step difference is generated in common electrode causing disconnection
Solution Approach 1:
The patent extracts and removes light emitting elements that are disposed in non-emission areas from the substrate. This selective removal eliminates the problematic step differences caused by misplaced elements while maintaining the simplified manufacturing approach of initial bulk placement.
Solution Approach 2:
The patent performs preliminary placement of light emitting elements across the entire substrate including non-emission areas, then subsequently removes the misplaced elements. This preliminary action allows for simplified initial manufacturing while enabling later correction of placement errors.
2Reliability
If light emitting elements are removed from non-emission areas, then electrode disconnection is prevented, but additional manufacturing steps are required
Solution Approach 1:
The patent implements a systematic extraction process where misplaced light emitting elements are selectively removed from non-emission areas. This targeted removal prevents electrode disconnection issues while adding only the necessary minimal steps for quality assurance.
3Stability of the object's composition
If light emitting elements are disposed only in emission area, then step difference is eliminated, but manufacturing precision is increased
Solution Approach 1:
The patent employs preliminary bulk placement of light emitting elements followed by selective removal of misplaced elements. This two-stage approach maintains the benefits of simplified initial manufacturing while achieving the precision required for stable electrode structure.
Solution Approach 2:
The patent extracts elements from non-emission areas to eliminate step differences, achieving stable electrode composition without requiring perfect initial placement precision.
Data Source
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AI summary
According to an embodiment of the disclosure, a display device may include a first electrode disposed on a substrate, a bank disposed on the substrate and including an opening exposing at least a portion of the first electrode, light emitting elements disposed on the first electrode, an insulating layer disposed on the bank to overlap the bank in a plan view, and a second electrode disposed on the insulating layer and the light emitting elements.