Display Electrode Layout With Bank Extension for Short-Circuit Isolation
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Solution Overview
Problem
Existing display devices face issues with short-circuiting between adjacent electrodes, which can lead to defects and performance degradation.
Innovation Solution
The display device incorporates a bank extension portion that overlaps a via hole, reducing the step difference between connection electrodes and preventing short-circuits by ensuring proper electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If connection electrodes are disposed close to each other to reduce device area, then area is reduced, but short-circuit risk between electrodes increases
Solution Approach 1:
An insulating layer is introduced as an intermediary substance between adjacent connection electrodes. This insulating layer fills the space between electrodes and prevents direct electrical contact, thereby eliminating the short-circuit risk while allowing electrodes to be positioned close together for area reduction.
Solution Approach 2:
The problem of electrode spacing is solved by transitioning from a two-dimensional planar arrangement to a three-dimensional structure. The insulating layer adds a vertical dimension, enabling electrodes to be closely spaced horizontally while maintaining electrical isolation through the vertical insulating barrier.
2Manufacturing precision
If via hole size is reduced to improve manufacturing precision, then manufacturing precision is improved, but step difference between electrodes increases causing short-circuit risk
Solution Approach 1:
The insulating layer acts as a mediator that compensates for the increased step difference caused by smaller via holes. By filling the depth variation, it provides a flat, isolated surface for electrode formation, maintaining electrical isolation despite the pronounced step structure.
Solution Approach 2:
The physical and chemical parameters of the insulating layer are optimized to match the via hole dimensions. The layer's thickness, material composition, and deposition parameters are adjusted to ensure complete filling of reduced via holes while providing adequate insulation height to prevent short-circuits.
Data Source
AI summary
A display device includes a conductive pattern on a substrate, a via layer on the conductive pattern with a via hole exposing the conductive pattern, a first electrode and a second electrode on the via layer and spaced apart from each other, a first insulating layer on the first electrode and the second electrode, a bank layer on the first insulating layer defining an emission area and a subarea, a light-emitting element on the first insulating layer, and a first connection electrode and a second connection electrode on the first insulating layer and the light-emitting element. The first connection electrode electrically contacts an end of the light-emitting element, and the second connection electrode electrically contacts another end of the light-emitting element. The bank layer includes a bank extension portion extended to the subarea and the bank extension portion overlaps at least a portion of the via hole.