Wavelength Converting Device with Dichroic Filter and Scanning Laser
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Solution Overview
Problem
Conventional semiconductor light-emitting devices for headlights suffer from color variation issues, leading to unfavorable light distribution patterns, and existing solutions that use wavelength converting plates with mirrors result in decreased light-emitting efficiency.
Innovation Solution
The development of wavelength converting devices featuring a transparent substrate with a grid-like groove and a dichroic filter, along with a wavelength converting layer divided into chips, which uses a movable mirror to scan a laser beam for efficient light emission with high color uniformity and intensity, including the use of phosphors for additive color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a wavelength converting plate with mirror is used to improve light distribution, then color uniformity may be improved, but light-emitting efficiency decreases
Solution Approach 1:
The wavelength converting plate is divided into multiple wavelength converting chips arranged in a matrix pattern, with each chip having independent incident and emitting surfaces. This segmentation allows selective excitation of individual chips by the scanning laser beam, improving both color uniformity and light-emitting efficiency by preventing light loss from non-excited regions.
Solution Approach 2:
A scanning laser beam system with movable mirror is employed to dynamically excite different wavelength converting chips in sequence. This dynamic excitation approach replaces static illumination methods, allowing precise control over which chips are activated at any given time, thereby maintaining high color uniformity while maximizing light-emitting efficiency through selective excitation.
2Loss of energy
If a conventional semiconductor light-emitting device with wavelength converting layer is used, then light-emitting efficiency is maintained, but color variation occurs leading to unfavorable light distribution patterns
Solution Approach 1:
Different wavelength converting chips can have different phosphor compositions and characteristics tailored to specific spatial positions in the matrix. This local quality differentiation allows each chip to contribute optimally to the overall color uniformity when excited by the scanning laser beam, while maintaining high light-emitting efficiency through precise localized excitation.
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 solution provides desirable light distribution patterns with high light efficiency and color uniformity, suitable for various lighting applications such as stage lights, street lights, and vehicle headlights, while preventing color variations and maintaining high light-emitting efficiency.
Implementation Method 1
a dichroic filter disposed on the substrate top surface of the transparent substrate
Implementation Method 2
a wavelength converting layer disposed on the filter top surface of the dichroic filter, and divided into a plurality of wavelength converting chips
Implementation Method 3
which uses a movable mirror to scan a laser beam for efficient light emission with high color uniformity and intensity, including the use of phosphors for additive color mixing
Implementation Method 4
which uses a movable mirror to scan a laser beam
Data Source
AI summary
A wavelength converting device, a method for manufacturing the device and a lighting unit using the device can emit various color lights. The converting device can include a substrate, a filter disposed on the substrate and the wavelength converting layer including a plurality of wavelength converting chips disposed on the filter, and can be manufactured by almost cutting process. The lighting unit using the device includes a laser device, a movable mirror and a controller, which enables the laser device to generate a pulsed laser beam and enables the movable mirror to scan the pulsed laser beam into a respective one of the wavelength converting chips. Thus, the disclosed subject matter can provide the wavelength converting device, which can form various colored light distribution patterns including a white light to use for a headlight and the like, and can provide methods for efficiently manufacturing such the devices with high accuracy.