Light Emitting Element Electrode Layout for Uniform Emission

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Solution Overview

Problem

Existing light emitting elements experience uneven distribution of current density between electrodes, leading to non-uniform emission.

Innovation Solution

The light emitting element features specific electrode configurations with extending portions that diffuse current uniformly across the semiconductor stack, including first and second electrodes with connecting portions and extending portions arranged to minimize current density variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If electrode structures are disposed at center portions or embracing configurations, then current density distribution is improved, but uneven distribution still occurs in the region between electrodes

Engineering Contradiction:

Improvecurrent density distribution uniformityVSAvoidemission uniformity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The electrode structures are divided into multiple extending portions (first extending portion, second extending portions, third extending portions, fourth extending portions) that segment the current path into multiple parallel channels. This segmentation distributes current more uniformly across the semiconductor stack by creating multiple current flow paths rather than a single concentrated path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different extending portions are positioned at different locations with specific orientations. The first extending portion extends in a first direction while the second extending portions extend in a second direction, creating locally optimized current distribution patterns. This local quality variation ensures uniform current density across different regions of the semiconductor stack.

Inventive Principle:

Principle #3Local quality

2Device complexity

If simple electrode configurations are used, then device complexity is reduced, but current density distribution becomes uneven

Engineering Contradiction:

Improveelectrode structure complexityVSAvoidcurrent density distribution uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The electrode is segmented into multiple extending portions with different orientations and positions. This segmentation increases current distribution uniformity while maintaining a relatively simple overall electrode structure that can be manufactured using standard processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode extending portions are arranged in multiple directions (first direction and second direction perpendicular to each other). This multi-dimensional arrangement creates a three-dimensional current distribution pattern that improves uniformity without significantly increasing manufacturing complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20250366270A1Light emitting element

Publication Date: 2025.11.27 NICHIA CORP

AI summary

A light emitting element includes: a semiconductor structure; first and second electrodes formed above the semiconductor structure. In a plan view: the first electrode comprises a first pad electrode, a first extending portion extending from the first pad electrode, and two second extending portions extending from the first pad electrode, and the second electrode comprises a second pad electrode, and two third extending portions extending from the second pad electrode.