Light-Emitting Apparatus With Diffusion And Prism Layers
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Solution Overview
Problem
Conventional light-emitting devices face challenges in achieving uniform light extraction efficiency and color temperature variance across different angles, with existing optical elements failing to optimize light distribution and color uniformity effectively.
Innovation Solution
The proposed light-emitting apparatus incorporates a light-emitting diode with a wavelength conversion layer and transparent layers, where the wavelength conversion layer is strategically designed with specific thickness and particle size to scatter light, combined with a diffusion layer and prism layer to redistribute and concentrate light, enhancing light extraction efficiency and color uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical elements (lens, reflector, wavelength convertor) are used to change optical properties, then light direction and color can be adjusted, but light extraction efficiency and color uniformity across different angles cannot be optimized effectively
Solution Approach 1:
The optical element is divided into multiple functional layers: a diffusion layer with scattered light-transmitting particles and a prism layer with light-guiding prisms. Each layer performs a specific function (diffusion vs. concentration), allowing independent optimization of light extraction efficiency and color uniformity without requiring multiple separate optical components.
Solution Approach 2:
The diffusion layer uses a composite structure combining a transparent matrix material with dispersed light-transmitting particles. This composite material provides both diffusion functionality and maintains optical transparency, achieving effective light redistribution while preserving color uniformity across viewing angles.
2Stability of the object's composition
If a wavelength conversion layer with specific thickness and particle size is used to scatter light, then color uniformity can be improved, but light extraction efficiency may be compromised
Solution Approach 1:
The diffusion layer acts as an intermediary between the wavelength conversion layer and the external environment. It receives scattered light from the wavelength conversion layer and redistributes it through the prism layer, which then concentrates and guides the light. This intermediary structure allows the wavelength conversion layer to focus on color uniformity while the diffusion layer handles light extraction optimization.
Solution Approach 2:
The diffusion layer uses light-transmitting particles with specifically controlled size parameters (0.1-10 micrometers) and concentration. By adjusting these parameters, the layer achieves optimal diffusion without excessive absorption, maintaining both color uniformity and light extraction efficiency. The particle size is carefully selected to scatter light effectively while minimizing energy loss.
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 configuration significantly improves light extraction efficiency and color space uniformity, reducing color temperature variance and enhancing the overall optical properties of the light-emitting device, achieving efficiencies up to 140 lm/W and color space uniformity within specific MacAdam ellipses.
Implementation Method 1
the wavelength conversion layer is strategically designed with specific thickness and particle size to scatter light
Implementation Method 2
a diffusion layer, covering the first light-emitting device and the second light-emitting device
Implementation Method 3
a prism layer, disposed on the diffusion layer
Data Source
AI summary
A light-emitting apparatus includes a first light-emitting device, a second light-emitting device, separated from the first light-emitting device by a first distance, a diffusion layer, covering the first light-emitting device and the second light-emitting device, a prism layer, disposed on the diffusion layer and an LCD module, disposed on the prism layer. The first light-emitting device includes a light-field with a radius on the LCD module and the radius is two or more times larger than the first distance.