LED Reflective Member Redirects Lateral Light
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Solution Overview
Problem
Light emitting diodes (LEDs) suffer from reduced efficiency due to lateral light emission, which degrades the overall light output as emitted light is not effectively directed towards the top surface.
Innovation Solution
A light emitting device structure incorporating a reflective member spaced apart from the light emitting semiconductor layer, which includes a second conductive semiconductor layer, an active layer, and a first conductive semiconductor layer, to reflect laterally emitted light towards the top surface, thereby enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional LED structure is used, then the device is simple in structure, but light efficiency is degraded due to lateral light emission
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using a reflective member to redirect the harmful lateral light emission back towards the top surface. The reflective member captures light that would otherwise be lost laterally and redirects it upward, converting the harmful lateral emission into useful top-direction light output, thereby improving overall light efficiency without significantly complicating the device structure
Solution Approach 2:
The reflective member serves as an intermediary element between the light emitting semiconductor layer and the external environment. It mediates the light propagation by intercepting laterally emitted light and redirecting it toward the top surface, acting as a middleman that transforms the light emission pattern from predominantly lateral to predominantly upward direction
2Loss of energy
If no reflective member is used, then the device structure is simple, but light is lost in lateral direction
Solution Approach 1:
The reflective member converts the harmful lateral light loss into beneficial upward light output by reflecting laterally emitted light back towards the top surface, thereby reducing energy loss and improving overall light efficiency
Solution Approach 2:
The reflective member changes the emission direction parameter of the light by redirecting laterally emitted light at specific angles toward the top surface, modifying the light propagation characteristics to reduce lateral loss and enhance upward emission
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 reflective member effectively redirects lateral light emissions upwards, improving the light emitting efficiency of the device by ensuring more light is directed towards the top surface, thus enhancing overall performance.
Implementation Method 1
a reflective member spaced apart from the light emitting semiconductor layer on the second electrode layer
Data Source
AI summary
Disclosed are a light emitting device and a method of manufacturing the same. The light emitting device includes a second electrode layer, a light emitting semiconductor layer including a second conductive semiconductor layer, an active layer, and a first conductive semiconductor layer on the second electrode layer, a reflective member spaced apart from the light emitting semiconductor layer on the second electrode layer, and a first electrode layer on the first conductive semiconductor layer.