Light-emitting element array with overlapping block separation and constriction grooves
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Solution Overview
Problem
The uniformity of the current passing region shape in light-emitting element arrays is compromised due to differences in oxidation rates between constriction grooves and block separation grooves, leading to non-uniform light emission intensity across the array.
Innovation Solution
A light-emitting element array design where constriction grooves form a current constriction layer by oxidizing the light-emitting layer, and a block separation portion is formed to overlap part of the constriction grooves, ensuring electrical insulation between blocks while maintaining a consistent current passing region shape by controlling the overlap and depth of the block separation groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If block separation grooves are provided to divide light-emitting elements into blocks, then electrical insulation between blocks is achieved, but oxidation rate differences cause non-uniformity in current passing region shape
Solution Approach 1:
The block separation groove is merged with the constriction groove structure, where the block separation groove is formed to overlap with at least one constriction groove. This integration allows the block separation function and current constriction function to be achieved simultaneously, preventing non-uniform oxidation while maintaining electrical insulation between blocks.
Solution Approach 2:
The groove structure is designed with different local characteristics: the block separation groove overlaps with constriction grooves at specific locations to control oxidation, while maintaining sufficient width in other areas to ensure electrical insulation. This local differentiation allows simultaneous achievement of uniform oxidation and block isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design suppresses non-uniformity in the current passing region shape, ensuring consistent light emission intensity across the array by optimizing the overlap and depth of the block separation groove relative to the constriction grooves, thereby enhancing the array's uniformity and efficiency.
Implementation Method 1
constriction grooves such as a plurality of trench grooves are provided in the periphery of each of locations where the light-emitting elements are to be configured, a current constriction layer is formed by oxidizing a light-emitting layer from inside the constriction groove
Implementation Method 2
the block separation groove is also oxidized rather than the constriction groove. As a result, there may be a difference between a portion that is oxidized from the block separation groove and a portion that is only oxidized from the constriction groove
Data Source
AI summary
A light-emitting element array includes a substrate, plural light-emitting elements arranged on the substrate, plural constriction grooves being provided in a periphery of each of the plural light-emitting elements, and forming a current constriction layer that constricts a current flowing through a light-emitting layer by oxidizing the light-emitting layer, and a block separation portion that is formed so as to overlap a part of the plural constriction grooves in plan view, and separates the plural light-emitting elements into plural blocks.