Hexagonal Light-Emitting Element with Semispherical Lens for Reduced Corner Distance
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Solution Overview
Problem
Conventional light-emitting devices with semispherical lenses over rectangular light-emitting elements suffer from reduced light extraction efficiency due to increased distances from the center to the corners, leading to light loss.
Innovation Solution
A light-emitting device with a hexagonally shaped light-emitting element and a semispherical lens portion, along with a flange portion, is designed to improve light extraction efficiency by reducing the distance from the center to the corners, utilizing a wiring pattern, phosphor layer, insulation layer, and protective element for enhanced light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular light-emitting element is used with a semispherical lens, then the device structure is simple and easy to manufacture, but the light extraction efficiency is reduced due to increased distances from the center to the corners
Solution Approach 1:
The patent applies asymmetry by changing the light-emitting element shape from rectangular to hexagonal. This geometric transformation reduces the maximum distance from the center to the edges/corners, improving light extraction efficiency while maintaining manufacturing feasibility through standard semiconductor fabrication processes
2Loss of energy
If the distance from the center to the corners of the light-emitting element is reduced, then light extraction efficiency is improved, but the area of the light-emitting element is reduced
Solution Approach 1:
The patent changes the geometric parameters by adopting a hexagonal shape with optimized dimensions. The hexagon is configured such that its inscribed circle diameter equals the diagonal length of the rectangular element it replaces, maintaining comparable light-emitting area while reducing the maximum radial distance from center to edge, thereby improving light extraction efficiency
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 hexagonal shape of the light-emitting element and the semispherical lens configuration enhance light extraction efficiency by minimizing light loss, allowing more efficient output of light from the device.
Implementation Method 1
a light transmissive member including: an approximately semispherical lens portion covering the light-emitting element
Data Source
AI summary
A light-emitting device includes a support body having a wiring pattern; a light-emitting element mounted on the wiring pattern and having a planar shape that is approximately a regular hexagon; and a light transmissive member including: an approximately semispherical lens portion covering the light-emitting element, and a flange portion disposed around a periphery of the lens portion.