LED Package Lens with Reflective and Diffractive Surfaces
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Solution Overview
Problem
Conventional light emitting diode packages with large divergent angles result in unsatisfactory illumination intensity when applied as side illuminating sources, and the need for multiple medium conversions leads to significant light loss and reduced brightness in display products.
Innovation Solution
A light emitting diode package utilizing a semi-vase-shaped lens with reflective and diffractive surfaces, where total internal reflection and diffraction direct light within ±25°, eliminating the need for medium conversions and enhancing illumination efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light emitting diode package with large divergent angle (±60°) is used, then the light source provides broad illumination coverage, but the illumination intensity at the side of the light device becomes unsatisfactory
Solution Approach 1:
The lens is divided into multiple functional zones: a first lens portion with a first refractive index for controlling light in a first direction, and a second lens portion with a second refractive index for controlling light in a second direction. This segmentation allows different parts of the lens to optimize for different illumination requirements, achieving both high intensity and directional control.
Solution Approach 2:
Different regions of the lens are assigned different optical properties (refractive indices) to perform different functions. The first lens portion has optimized refractive index for side illumination, while the second lens portion has optimized refractive index for upward illumination, allowing each region to contribute optimally to its designated function.
2Adaptability or versatility
If multiple medium conversions are used to control light direction, then the illumination direction can be adjusted, but significant light loss occurs and brightness is reduced
Solution Approach 1:
The lens combines multiple optical functions (directional control, light collection, and illumination optimization) into a single integrated optical element. This eliminates the need for separate reflectors, lenses, and medium conversions, thereby reducing light loss while maintaining directional control capability.
Solution Approach 2:
The lens acts as an intermediary optical element that directly couples the LED chip to the light guide plate, eliminating intermediate media and conversions. The specialized lens structure provides both direction control and efficient light transfer in one component.
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 provides effective side illumination with improved brightness and reduced light loss, allowing the light emitting diode package to function as an excellent side illuminating source for display products with simpler structures and lower costs.
Implementation Method 1
portions of light beams incident to each of the reflective surfaces are reflected to at least one diffractive surface
Implementation Method 2
diffracted and collected into a convergent angle
Data Source
AI summary
A light emitting diode package includes a light emitting diode device and a lens encapsulating the light emitting diode device. The lens includes two reflective surfaces disposed at either side of a central axis, and a plurality of diffractive surfaces disposed between the reflective surfaces and each of the diffractive surfaces has a tilt angle respective to the central axis. Portions of light beams incident to each of the reflective surfaces are reflected to at least one diffractive surface and are diffracted and collected into a convergent angle.