Light-Emitting Element Side Wiring for Stable Small-Footprint Electrodes
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Solution Overview
Problem
Existing light-emitting elements with one side electrode structures face limitations in reducing element area and achieving stable electrical connections due to restricted side wiring connection areas and unstable electrical connections.
Innovation Solution
A light-emitting element configuration featuring a laminate with inclined side surfaces, a first electrode in a concave portion closer to the light-emitting layer, a second electrode on the non-light-emitting surface, a third electrode insulated from the second, and side wiring connecting the first and third electrodes, which reduces the element area and stabilizes electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the side surface is perpendicular to the layer surface, then the element area is larger, but the contact area of the first electrode with the first semiconductor layer is smaller
Solution Approach 1:
The side surface of the laminate is designed to be inclined rather than perpendicular, creating an asymmetric geometry that allows the first electrode to extend closer to the light-emitting layer while maintaining structural integrity. This asymmetric configuration increases the contact area between the electrode and semiconductor layer, thereby improving electrical connection stability without requiring a larger element area.
Solution Approach 2:
The first electrode is positioned in a concave portion that extends in the depth direction (z-direction) rather than only in the planar direction. By utilizing the third dimension (depth), the electrode achieves greater contact area with the semiconductor layer without increasing the element's planar footprint, thus resolving the contradiction between element area and connection stability.
2Area of stationary object
If the first electrode is positioned closer to the light-emitting layer, then the element area is reduced, but the manufacturing precision required increases
Solution Approach 1:
The concave portion is pre-formed in the first semiconductor layer before the first electrode is deposited. This preliminary structuring provides a built-in guide and support for the electrode, ensuring accurate positioning closer to the light-emitting layer without requiring extremely high manufacturing precision during the electrode formation step itself.
Solution Approach 2:
The inclined side surface creates a localized region with enhanced geometric features that naturally guide the first electrode into the correct position. The varying slope of the inclined surface provides different local characteristics that facilitate precise electrode placement near the light-emitting layer while maintaining overall manufacturing feasibility.
3Reliability
If the side surface is inclined, then the contact area of the first electrode is increased, but the device complexity increases
Solution Approach 1:
The inclined side surface and the concave portion are integrated into a single continuous structural feature of the laminate. By merging these two elements into one unified geometric configuration, the design achieves increased electrode contact area without requiring separate additional components or complex assembly steps, thus limiting the increase in device complexity.
Data Source
AI summary
A light-emitting element and an electronic apparatus capable of reducing the element area and realizing a stable electrical connection. A light-emitting element according to the present technology includes a first semiconductor layer, a light-emitting layer, and a second semiconductor layer laminated in this order, and a light-emitting surface, a non-light-emitting surface, and a side surface connecting the light-emitting surface and the non-light-emitting surface. The side surface is inclined. A first electrode is in a concave portion in the light-emitting surface at a periphery of the first semiconductor layer. A second electrode is on a non-light-emitting surface side of the laminate. A third electrode is on the non-light-emitting surface side of the laminate and is insulated from the second electrode. The side wiring electrically connects the first electrode and the third electrode via the side surface.