Micro-LED Electrode Layout for Accurate Optical and Electrical Testing
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Solution Overview
Problem
The challenge is to evaluate the electrical and optical characteristics of micro-sized light-emitting elements, which is difficult due to their small size.
Innovation Solution
A light-emitting element structure is developed, comprising a light-emitting element grown on a substrate, an auxiliary layer, a current spreading layer, and pads that allow for the measurement of electrical and optical characteristics without obstructing light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light-emitting elements are manufactured at micro-size, then device integration and display performance are improved, but measurement and evaluation of electrical and optical characteristics become difficult
Solution Approach 1:
The patent segments the measurement system into separate functional components: current spreading layers for electrical contact, auxiliary layers for structural support, and pad electrodes positioned away from the light-emitting element. This segmentation allows independent optimization of each component for both micro-scale integration and accurate measurement capabilities.
Solution Approach 2:
The patent introduces intermediary structures including current spreading layers that mediate between the pad electrodes and the light-emitting element, and auxiliary layers that provide structural mediation. These intermediaries enable reliable electrical and optical measurement while maintaining the micro-size of the light-emitting element itself.
2Area of stationary object
If pads are placed close to light-emitting elements for electrical connection, then device area is reduced, but light emission may be obstructed
Solution Approach 1:
The patent applies local quality by creating distinct functional zones: pad electrodes are positioned in areas optimized for electrical connection while current spreading layers and auxiliary layers are configured in regions that minimize light obstruction. This spatial differentiation of functional qualities allows simultaneous optimization of electrical connectivity and optical performance.
Solution Approach 2:
The patent resolves the area conflict by transitioning to three-dimensional structuring with multiple layers. Pad electrodes, current spreading layers, and auxiliary layers are arranged in vertical stacking, allowing electrical connections to be made without pads occupying the same planar space as the light-emitting element, thus preserving light emission pathways.
3Ease of manufacture
If conventional measurement methods are used on micro-sized light-emitting elements, then manufacturing simplicity is maintained, but measurement accuracy deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-configuring the light-emitting element structure with integrated current spreading layers, auxiliary layers, and strategically positioned pad electrodes during the manufacturing process. This preliminary structuring ensures that accurate measurement capabilities are built-in from the start, eliminating the need for complex post-manufacturing measurement setups.
Data Source
AI summary
A light emitting element structure may include at least one light emitting element which is disposed on a substrate and spaced apart from each other, and extends in a direction perpendicular to the substrate; an auxiliary layer which is disposed on the substrate, exposes at least a portion of the upper surface of the substrate, and surrounds the outer surface of the light emitting element; a current spreading layer which is disposed on the auxiliary layer and electrically contacts an end of the light emitting element; a first pad which is electrically connected to the end of the light emitting element, disposed on the current spreading layer, and does not to overlap the light emitting element; and a second pad which is electrically connected to another end of the light emitting element disposed on the upper surface of the exposed substrate and spaced apart from the auxiliary layer.