Reflective Electrode Layout for Subminiature LED Alignment
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Solution Overview
Problem
The challenge of aligning subminiature light emitting diodes (LEDs) on electrodes is difficult, leading to alignment defects and reduced efficiency in lighting and display devices.
Innovation Solution
A light emitting device design featuring a first and second electrode with an insulating pattern and banks, reflective electrodes, and contact electrodes to align and connect subminiature LEDs, enhancing their efficiency and minimizing alignment defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If subminiature LEDs are independently grown and then disposed on electrodes, then manufacturing flexibility is improved, but alignment precision deteriorates
Solution Approach 1:
The patent introduces an insulating pattern as an intermediary structure between the electrode and the subminiature LED. This insulating pattern provides a defined placement surface that facilitates precise alignment of the LED on the electrode, thereby resolving the alignment precision issue while maintaining the independent growth and disposal approach for manufacturing flexibility
Solution Approach 2:
The insulating pattern is formed on the electrode before the subminiature LED is disposed on it. This preliminary action creates a pre-defined alignment structure that guides the LED placement, ensuring precise alignment is achieved before the final assembly step
2Area of stationary object
If electrode space is reduced for subminiature LEDs, then device miniaturization is improved, but alignment difficulty increases
Solution Approach 1:
The patent segments the electrode structure by introducing an insulating pattern that divides the electrode surface into distinct functional zones. This segmentation allows for precise LED placement within a reduced space while maintaining alignment ease through the defined boundaries provided by the insulating pattern
Solution Approach 2:
The insulating pattern adds a vertical dimension to the alignment solution by creating a raised or distinct surface layer. This dimensional change allows the LED to be aligned on the insulating pattern rather than directly on the flat electrode surface, making alignment easier even when electrode space is reduced
Data Source
AI summary
A light emitting device may include a first electrode disposed on a substrate, and a second electrode spaced apart from the first electrode, the first electrode and the second electrode being disposed on a same layer; an insulating pattern disposed between the first electrode and the second electrode, and overlapping a portion of the first electrode and a portion of the second electrode; and at least one light emitting element disposed on the insulating pattern, and including a first end and a second end in a longitudinal direction of the at least one light emitting element; a first bank disposed on the first electrode, and a second bank disposed on the second electrode; a first reflective electrode disposed on the first bank and electrically connected with the first electrode; and a second reflective electrode disposed on the second bank and electrically connected with the second electrode.