Bank-Overlapped Pixel Electrode Layout for Display Short-Circuit Risk
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Solution Overview
Problem
Display devices face issues with short-circuit defects due to electrode residues on banks, which are not effectively addressed by existing technologies.
Innovation Solution
The display device design includes pixel electrodes and connection electrodes arranged to overlap a bank, with specific spacing and orientations to minimize short-circuit risks even if electrode residues occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel electrodes are closely spaced to improve display resolution, then manufacturing precision deteriorates due to increased short-circuit risk from electrode residues on banks
Solution Approach 1:
The bank structure serves as an intermediary element that separates and isolates the pixel electrodes. By positioning the bank between closely spaced pixel electrodes, it prevents direct contact and short-circuits even when electrode residues are present, thus enabling high display resolution without compromising manufacturing precision
Solution Approach 2:
The harmful factor (electrode residue) is extracted and isolated from the critical region by the bank structure. The bank physically removes the residue from the path between pixel electrodes, preventing it from causing short-circuits while allowing the pixel electrodes to be closely spaced for high resolution
2Reliability
If connection electrodes overlap the bank to minimize short-circuit defects, then device complexity increases due to specific spacing and orientation requirements
Solution Approach 1:
The bank structure performs multiple functions simultaneously: it acts as a physical barrier to prevent short-circuits, serves as a positioning reference for connection electrodes, and maintains electrical isolation. This multi-functionality reduces the need for additional complex structures while ensuring electrical stability
Solution Approach 2:
The connection electrodes are designed to maintain uniform potential distribution by overlapping the bank structure. This equipotential arrangement ensures that no potential differences create electric fields that could cause short-circuits, simplifying the overall device design while improving reliability
Data Source
AI summary
A display device includes a base layer, a first pixel electrode disposed in a first direction on the base layer and to which a first driving voltage is applied, a second pixel electrode disposed in the first direction on the base layer and to which a second driving voltage is applied, a first light-emitting element and a second light-emitting element electrically connected to the first pixel electrode and the second pixel electrode, a connection electrode electrically connecting the first pixel electrode and the first light-emitting element, and electrically connecting the second light-emitting element and the second pixel electrode, and a bank overlapping at least a portion of the first pixel electrode and at least a portion of the second pixel electrode and surrounding a light-emitting area in which the first light-emitting element and the second light-emitting element are disposed. A portion of the connection electrode overlaps the bank.