Connection Electrode Layout for Misalignment-Tolerant Displays
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Solution Overview
Problem
Display devices face challenges in aligning connection electrodes during the manufacturing process, leading to potential misalignment and contact failures between electrodes and light-emitting elements, which can affect the display's performance and efficiency.
Innovation Solution
A novel electrode structure where connection electrodes are disposed on the same layer as light-emitting elements, allowing for misalignment compensation by shifting them in the same direction, ensuring proper electrical contact and maintaining the display's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection electrodes are disposed on the same layer as light-emitting elements, then misalignment can be compensated by shifting electrodes in the same direction, but manufacturing precision requirements increase
Solution Approach 1:
The connection electrodes are designed to extend in the first direction (length dimension) while light-emitting elements extend in the second direction (width dimension). This dimensional arrangement allows misalignment compensation by shifting electrodes along the first direction without requiring precise alignment in both directions, thereby maintaining reliable electrical contact while reducing manufacturing precision requirements.
Solution Approach 2:
The connection electrodes are divided into multiple segments (first connection electrode, second connection electrode, third connection electrode, etc.) that can be independently positioned and shifted. This segmentation allows each electrode segment to be adjusted to compensate for misalignment with corresponding light-emitting elements, ensuring reliable electrical contact despite manufacturing variations.
2Manufacturing precision
If connection electrodes are disposed on different layers, then alignment is easier to achieve, but electrical contact reliability decreases due to potential misalignment
Solution Approach 1:
The connection electrodes and light-emitting elements are merged onto the same layer, eliminating the need for inter-layer alignment. This co-planar arrangement ensures that both components are subject to the same manufacturing process conditions, making alignment easier to achieve while maintaining reliable electrical contact through the extended electrode design.
3Reliability
If connection electrodes are extended to cover multiple electrodes, then electrical contact reliability improves, but device complexity increases
Solution Approach 1:
Each connection electrode is designed to contact multiple light-emitting elements (e.g., the first connection electrode contacts both the first and second light-emitting elements). This multi-functional design improves electrical contact reliability by providing redundant contact paths while avoiding the need for separate dedicated electrodes for each light-emitting element, thereby reducing overall device complexity.
Data Source
AI summary
A display device includes a first electrode group including a plurality of electrodes, a second electrode group spaced apart from the first electrode group in the first direction and including a plurality of electrodes, light-emitting elements disposed on the electrodes spaced apart from one another in the second direction and having a shape extended in the second direction, and connection electrodes. The connection electrodes includes a first connection electrode, a second connection electrode, a third connection electrode, a fourth connection electrode, and the fifth connection electrode, the first connection electrode is spaced apart from a part of the fourth connection electrode disposed on the second electrode group in the first direction, and the second connection electrode is spaced apart from another part of the fourth connection electrode disposed on the first electrode group in the first direction.