Series Electrode Layout for Display Short-Circuit Prevention
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Solution Overview
Problem
Display devices face issues with short circuits between wires and emission area loss, leading to potential luminance defects and reduced efficiency in light-emitting elements.
Innovation Solution
A new electrode configuration that connects light-emitting elements in series, utilizing a conductive layer with aligned electrodes and contact electrodes to secure space for emission, minimizing short circuits and maximizing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting elements are arranged closely to increase emission area utilization, then luminance per unit area improves, but short circuits between wires occur more frequently
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent light-emitting elements and their corresponding wires. This insulating layer acts as a physical barrier that prevents direct contact between conductive elements, thereby eliminating short circuits while allowing the light-emitting elements to be arranged closely for high luminance per unit area.
2Reliability
If wire spacing is increased to prevent short circuits, then reliability improves, but emission area is lost
Solution Approach 1:
The solution moves from a two-dimensional spacing problem to a three-dimensional solution by adding vertical separation through the insulating layer. This allows wires to remain closely spaced in the horizontal plane (maintaining emission area) while being separated in the vertical dimension (preventing short circuits).
3Illumination intensity
If contact electrode extensions are added to connect light-emitting elements in series, then luminance stability improves, but device complexity increases
Solution Approach 1:
The contact electrode extensions are merged with the existing electrode structure, forming an integrated series connection system. The extensions naturally extend from the contact electrodes and connect adjacent light-emitting elements, combining the functions of contact and series connection into a single continuous conductive path without requiring separate components.
Data Source
AI summary
A display device includes a conductive layer including a first voltage line and a second voltage line extending in a first direction; an interlayer insulating layer on the conductive layer and including a plurality of contact holes that expose parts of the conductive layer; a plurality of first-type electrodes on the interlayer insulating layer and electrically connected to the conductive layer through the plurality of contact holes, a plurality of second-type electrodes on the interlayer insulating layer and extending in the first direction, a plurality of light-emitting elements on pairs of the first-type and the second-type electrodes that are spaced from each other in the second direction; first-type contact electrodes on the first-type electrodes and in contact with the light-emitting elements; and second-type contact electrodes on the second-type electrodes and in contact with the light-emitting elements, each of the second-type contact electrodes includes contact electrode extensions on the second-type electrodes.