Solid State Lighting Lens Diffusion Features Color Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solid state lighting (SSL) devices exhibit color nonuniformity due to varying emission angles, as light travels different distances through the converter material, leading to a bluish appearance when viewed head-on and yellowish appearance when viewed from the side.
Innovation Solution
Incorporating a lens with diffusion features over the SSL device, which diffracts and scatters light to blend colors uniformly across the viewing angle, mitigating the color variance caused by emission angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a converter material is deposited on the SSE to generate white light, then the light output is improved, but color uniformity deteriorates due to varying emission angles
Solution Approach 1:
A lens is introduced as an intermediary component between the converter material and the external environment. The lens receives light from the converter material and redistributes it through diffusion features, mediating the interaction between the light source and the viewing angle to achieve uniform color perception across different directions
Solution Approach 2:
The lens changes the directional parameters of light propagation by incorporating diffusion features. These features alter the emission angle distribution and path length through the converter material, transforming the angular dependency of color to achieve uniformity across different viewing angles
2Illumination intensity
If light travels through the converter material at large emission angles, then more yellow light is generated, but color uniformity deteriorates
Solution Approach 1:
The lens diffusion features change the emission angle parameter of light before it enters the converter material. By pre-diffusing the light, the lens ensures that light traveling at large emission angles does not dominate, thereby maintaining consistent color composition across different viewing directions
Solution Approach 2:
The lens performs preliminary diffusion of light before it interacts with the converter material at various angles. This preliminary action redistributes the light paths, ensuring that the converter material is illuminated more uniformly from different angles, which prevents excessive yellow light generation at large emission angles
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 achieves superior color uniformity across the SSL device, ensuring a consistent light appearance regardless of the viewing angle by diffusing light emitted from both the SSE and the converter material.
Implementation Method 1
Incorporating a lens with diffusion features over the SSL device, which diffracts and scatters light to blend colors uniformly across the viewing angle
Implementation Method 2
Incorporating a lens with diffusion features over the SSL device, which diffracts and scatters light to blend colors uniformly across the viewing angle
Implementation Method 3
The converter material 6 scatters some of the light emitted by the SSE 4 and absorbs other light emitted by the SSE 4. The absorbed light causes the converter material 6 to emit light of a different color
Data Source
AI summary
Solid state lighting (SSL) devices and methods of manufacturing SSL devices are disclosed herein. In one embodiment, an SSL device comprises a support having a surface and a solid state emitter (SSE) at the surface of the support. The SSE can emit a first light propagating along a plurality of first vectors. The SSL device can further include a converter material over at least a portion of the SSE. The converter material can emit a second light propagating along a plurality of second vectors. Additionally, the SSL device can include a lens over the SSE and the converter material. The lens can include a plurality of diffusion features that change the direction of the first light and the second light such that the first and second lights blend together as they exit the lens. The SSL device can emit a substantially uniform color of light.