LED Lateral Light Direction Control via Segmented Diffusion Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need to control the direction of light emitted laterally from light-emitting devices, such as LEDs, as existing technologies do not effectively manage light distribution and directionality.
Innovation Solution
A light-emitting device comprising a light-emitting element, a first light-diffusion layer, a second light-diffusion layer, a light-control portion, and a first light-reflection layer, where the light-control portion is disposed between the diffusion layers to reflect and control the light direction, and the light-reflection layer is on the second diffusion layer to enhance lateral light extraction efficiency and directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional light-emitting devices are used, then light is emitted in all directions, but the direction of light cannot be controlled
Solution Approach 1:
The device is divided into multiple functional layers: a light-emitting element, a first light-diffusion layer, a second light-diffusion layer, a light-control portion, and a first light-reflection layer. Each layer performs a specific function in controlling light propagation, enabling directional light emission through structured segmentation of the optical path.
Solution Approach 2:
Different regions of the device have different optical properties. The light-control portion is positioned at a specific location to reflect light in a predetermined direction, while the light-diffusion layers have specific refractive indices to control light scattering. This local differentiation of optical properties enables precise directional control of emitted light.
2Productivity
If light is emitted in all directions, then light distribution is wide, but light-extraction efficiency is insufficient
Solution Approach 1:
The light-control portion utilizes the refractive index difference between the light-diffusion layer and the light-control portion to reflect light that would otherwise be lost. This converts what would be energy loss into useful directional light emission, improving overall light-extraction efficiency by capturing and redirecting light that would escape in unwanted directions.
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 solution effectively controls the direction of laterally emitted light, improving light-extraction efficiency and allowing for precise management of light distribution across the lateral surfaces of the light-emitting device.
Implementation Method 1
a light-control portion disposed between the first light-diffusion layer and the second light-diffusion layer and reflecting a portion of light from the light-emitting element
Implementation Method 2
a first light-diffusion layer disposed laterally to the light-emitting element and constituting a portion of lateral surfaces of the light-emitting device, a second light-diffusion layer disposed above the light-emitting element and the first light-diffusion layer
Data Source
AI summary
A light-emitting device includes: a light-emitting element; a first light-diffusion layer disposed laterally to the light-emitting element and constituting a first portion of lateral surfaces of the light-emitting device; a second light-diffusion layer disposed above the light-emitting element and the first light-diffusion layer and constituting a second portion of the lateral surfaces of the light-emitting device; a light-control portion disposed between the first light-diffusion layer and the second light-diffusion layer and configured to reflect a portion of light emitted from the light-emitting element; and a first light-reflection layer disposed on the second light-diffusion layer.