Electrode Protrusions for Light Emitting Element Alignment
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Solution Overview
Problem
Current display devices face challenges in achieving optimal alignment and efficient integration of light emitting elements, leading to reduced light emitting efficiency and increased contact blind spots due to the geometry of electrodes and protrusions.
Innovation Solution
The display device incorporates first and second electrodes with specific protrusions and curved third portions that facilitate the alignment and contact of light emitting elements, ensuring a constant distance and improved alignment between electrodes, thereby enhancing the integration and efficiency of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrode geometries are used, then manufacturing is simpler, but alignment precision of light emitting elements deteriorates
Solution Approach 1:
The electrode is divided into multiple functional portions: a body portion, a first protrusion extending toward the light emitting element, and a second protrusion extending toward the contact pad. This segmentation allows each portion to serve a specific function in guiding and aligning the light emitting element during fabrication, thereby improving alignment precision without overwhelming complexity.
Solution Approach 2:
The protrusions are pre-formed on the electrodes before the light emitting elements are placed. These pre-formed protrusions create predetermined alignment features that guide the positioning of light emitting elements, ensuring precise alignment is achieved before the final assembly is completed.
2Manufacturing precision
If electrode protrusions are added for alignment, then alignment precision improves, but contact blind spots increase
Solution Approach 1:
Instead of having protrusions that block contact, the electrode design incorporates gaps between the protrusions and the light emitting element body. The contact portions are positioned to make contact through or alongside the protrusions, inverting the conventional approach where protrusions would obstruct contact. This allows the protrusions to provide alignment guidance while the gaps ensure electrical contact is maintained.
3Productivity
If light emitting element density is increased, then light emitting efficiency improves, but alignment difficulty increases
Solution Approach 1:
The electrode structure provides localized alignment features through the protrusions at specific positions, rather than requiring uniform precision across the entire electrode. Each protrusion creates a local alignment reference point that guides the positioning of individual light emitting elements, making it easier to achieve high density arrangements with maintained alignment quality.
Data Source
AI summary
A display device includes a display element layer on a substrate. The display element layer may include first and second electrodes, and light emitting elements electrically coupled to the first and second electrodes. The first electrode may include first protrusions, a first portion located between the first protrusions, a second portion corresponding to a side of each first protrusion, and a third portion coupled between the first portion and a first end of the second portion. The second electrode may include second protrusions that protrude toward the first electrode and are spaced apart from each other in the first direction, a first portion located between the second protrusions, a second portion corresponding to a side of each of the second protrusions, and a third portion coupled between the first portion and a first end of the second portion.