LED Package Lens Diffuser for Color Deviation
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Solution Overview
Problem
Conventional light-emitting device packages using LEDs suffer from color deviation due to the emission of yellow light through the center and blue light through the corners, leading to design complexities and inferior light characteristics, especially in integrated types where the lens and light-emitting device are in contact.
Innovation Solution
A light-emitting device package is designed with a lens featuring a diffuser that includes a light diffusion structure with a rough surface on the light emission surface, which can be integrated or applied separately, to diffuse light and prevent color deviation by ensuring even light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an anisotropic secondary lens is applied to solve color deviation, then color uniformity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a diffuser as an intermediary component between the light source and the lens. This diffuser includes light dispersing agents distributed in the lens interior or light diffusion structures on the light emission surface, which mediate the light path to prevent color deviation without requiring complex anisotropic lens designs.
Solution Approach 2:
The patent replaces the complex anisotropic aspheric lens with a simpler lens combined with a diffuser that can be manufactured using conventional processes. The diffuser can be implemented as a separate attachable component or integrated into the lens, simplifying manufacturing while achieving the same color uniformity effect.
2Speed
If an anisotropic aspheric lens is used in integrated type packages, then light direction control is improved, but color deviation worsens and design becomes more difficult
Solution Approach 1:
The patent segments the optical system into two separate functional components: a lens for light direction control and a diffuser for color uniformity. The lens maintains its simple shape for easy manufacturing while the diffuser, positioned between the light source and lens or on the lens surface, handles the color mixing function that previously required complex lens design.
Solution Approach 2:
The diffuser acts as an intermediary element that decouples the light direction control function (performed by the simple lens) from the color uniformity function (performed by the diffuser). This intermediary component enables independent optimization of each function without the trade-offs inherent in integrated anisotropic lens designs.
3Ease of manufacture
If conventional lens design is used without diffuser, then manufacturing is simpler, but color deviation occurs
Solution Approach 1:
The patent creates a composite optical system combining a conventional lens material with light diffusion elements. The diffuser can be formed by incorporating light dispersing agents into the lens material during manufacturing or by applying a separate diffusion layer, creating a composite structure that maintains manufacturing simplicity while eliminating color deviation.
Solution Approach 2:
The patent changes the optical parameters of the light emission surface by introducing diffusion characteristics through the diffuser. This can be achieved by modifying the surface roughness, adding scattering particles, or creating microstructures on the lens surface, thereby transforming the light emission pattern to achieve color uniformity without changing the basic lens geometry.
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 diffuser structure effectively reduces color deviation by ensuring that light emitted through the center and corners of the lens is uniformly mixed, improving the light characteristics and simplifying the manufacturing process.
Implementation Method 1
a diffuser located on at least one of the interior of the lens or a light emission surface of the lens, so as to diffuse light
Implementation Method 2
a light dispersing agent disposed to be distributed in the interior of the lens
Data Source
AI summary
Embodiments provide a light-emitting device package including a light source, a lens disposed on the light source, and a diffuser located on at least one of the interior of the lens or a light emission surface of the lens, so as to diffuse light. The diffuser includes at least one of a light dispersing agent distributed in the interior of the lens, or at least one light diffusion structure located on at least one of the outside or the inside of the light emission surface of the lens. The light diffusion structure includes a rough surface formed on the light emission surface of the lens.