Bank-Layer Electrode Layout to Prevent Display Short Circuits
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Solution Overview
Problem
Existing display devices face challenges in preventing electrical short circuits due to the arrangement of electrodes, which can lead to inefficient performance and reliability issues.
Innovation Solution
A display device design featuring a first electrode extending in one direction and second electrodes spaced apart in a perpendicular direction, with light emitting elements disposed on both electrodes, a bank layer surrounding the emission area, and connection electrodes electrically connected to the light emitting elements to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes are arranged in a conventional manner, then the device structure is simple, but electrical short circuits occur between electrodes
Solution Approach 1:
The second electrode is divided into multiple second electrodes spaced apart from each other in the second direction. This segmentation prevents direct contact between electrode parts, eliminating the electrical short circuit while maintaining functional simplicity
Solution Approach 2:
The patent introduces a second direction perpendicular to the first direction for spacing the second electrodes. This dimensional approach separates electrodes in space without complicating the overall structure, preventing short circuits through spatial arrangement
2Reliability
If connection electrodes are added to connect light emitting elements, then electrical connectivity is improved, but the risk of short circuits increases
Solution Approach 1:
Connection electrodes are disposed only in specific sub-areas (first sub-area and second sub-area) rather than uniformly across the entire electrode structure. This localized approach ensures electrical connectivity where needed while minimizing the risk of short circuits in other regions
Solution Approach 2:
The bank layer serves as an intermediary structure between the electrodes and connection electrodes. Connection electrodes overlap the bank layer in plan view, using it as a mediator to establish electrical connections while preventing direct contact between opposing electrodes
Data Source
AI summary
A display device includes a first electrode, second electrodes, light emitting elements, a bank layer, and connection electrodes. Each of the second electrodes comprises an electrode stem part overlapping the bank layer and electrode branch parts branching from the electrode stem part and disposed partially in an emission area, and the connection electrodes comprise a first connection electrode disposed on the first electrode, overlapping an upper bank part of the bank layer and having a part disposed in a first sub-area, a second connection electrode disposed on a first electrode branch part of one of the second electrodes, overlapping a lower bank part of the bank layer and having a part disposed in a second sub-area, and a third connection electrode disposed on second electrode branch parts of different second electrodes of the second electrodes and on the first electrode and surrounding a part of the first connection electrode.