Light Emitting Element Array Reflector Structure for Stress-Resistant Emission
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Solution Overview
Problem
Existing light emitting elements with convex parts are prone to damage from external forces due to stress concentration on the rising portions of these convex parts.
Innovation Solution
A light emitting element array with a stacked structure including a first compound semiconductor layer, an active layer, and a second compound semiconductor layer, where the base part surface has a concavo-convex shape and is differentiable, with a first light reflection layer formed on the base part surface and a second light reflection layer with a flat shape on the second compound semiconductor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a convex part is formed on the first compound semiconductor layer to create a concave mirror function, then light emission efficiency is improved, but stress concentration occurs on the rising portion causing damage under external force
Solution Approach 1:
The patent applies curvature by forming a convex part on the first compound semiconductor layer to create a concave mirror function. This curved structure focuses and reflects light effectively, improving light emission efficiency while maintaining structural integrity through controlled curvature rather than sharp edges that would concentrate stress.
Solution Approach 2:
The convex part is formed only in specific regions where the concave mirror function is needed, rather than uniformly across the entire structure. This localized modification allows the patent to achieve improved light emission in critical areas while preserving the strength and stress distribution in other regions of the compound semiconductor layer.
2Shape
If a convex part is formed on the first compound semiconductor layer, then a concave mirror function is achieved, but stress concentration on the rising portion causes damage
Solution Approach 1:
The convex part with controlled curvature provides the necessary concave mirror function for light reflection and focusing. The smooth curved surface avoids sharp edges and stress concentration points, thereby maintaining structural reliability and resistance to damage under external forces.
Solution Approach 2:
The patent designs the convex part with gradual transitions and controlled rise portions that preemptively distribute stress before external forces are applied. This beforehand cushioning through proper geometric design prevents stress concentration and potential damage, ensuring the structure can withstand external forces while maintaining the concave mirror function.
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
The concavo-convex base part surface design enhances the resistance of the light emitting element to external forces, preventing damage and reducing the risk of stress concentration, while also improving light emission efficiency and suppressing stray light and light crosstalk.
Implementation Method 1
laser light is resonated between two light reflection layers (Distributed Bragg Reflector layers, DBR layers) to thereby generate laser oscillation
Data Source
AI summary
A light emitting element array includes a plurality of light emitting elements 10A arranged. Each light emitting element 10A includes: a stacked structure 20 including a stack of a first compound semiconductor layer 21 having a first surface 21a and a second surface 21b, an active layer 23 facing the second surface 21b of the first compound semiconductor layer 21, and a second compound semiconductor layer 22 having a first surface 22a and a second surface 22b; a first light reflection layer 41 formed on a base part surface 90 located on a first surface side of the first compound semiconductor layer 21; and a second light reflection layer 42 formed on a second surface side of the second compound semiconductor layer 22 and having a flat shape. The base part surface 90 extends to a peripheral region 99 surrounded by the plurality of light emitting elements. The base part surface 90 has a concavo-convex shape, and is differentiable.