Multi-Source Light Source Apparatus for Projector White Balance
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Solution Overview
Problem
Existing light source apparatuses for projectors face challenges in achieving high luminance and desired white balance due to lower fluorescence intensity compared to blue light, and the use of LEDs as excitation sources limits luminance per unit area.
Innovation Solution
A light source apparatus comprising multiple light sources with different wavelength bands, a wavelength converter, and a light combiner to generate illumination light, where the first and second excitation lights are incident on opposite surfaces of the converter, and blue light is combined with fluorescence to enhance intensity and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the intensity of blue light is suppressed to match the intensity of fluorescence, then the white balance is achieved, but the luminance of the illumination light decreases
Solution Approach 1:
The patent divides the excitation light source into multiple independent light sources (first light source and second light source) with different wavelength bands. Each light source independently excites the phosphor, allowing the fluorescence intensity to be significantly higher than the remaining blue light intensity, thus achieving both high luminance and proper white balance simultaneously
2Ease of manufacture
If LED is used as the excitation light source, then the device is compact and efficient, but the luminance per unit area is small
Solution Approach 1:
The patent combines multiple light sources (first light source and second light source) to illuminate the phosphor simultaneously. This merging of multiple light sources increases the total luminance per unit area while maintaining the compactness and efficiency advantages of using LED-based excitation sources
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 increases the brightness and maintains excellent white balance of illumination light, improving the luminance and efficiency of the light source apparatus.
Implementation Method 1
a wavelength converter that has a first surface and a second surface opposite from the first surface and converts the first excitation light and the second excitation light in term of wavelength and emits fourth light having a fourth wavelength band different from the first, second, and third wavelength bands
Implementation Method 2
a light combiner that combines the third light outputted from the third light source with the fourth light emitted from the wavelength converter to generate illumination light
Data Source
AI summary
A light source apparatus includes a first light source that outputs first excitation light having a first wavelength band, a second light source that outputs second excitation light having a second wavelength band, a third light source that outputs third light having a third wavelength band, a wavelength converter that has a first surface and a second surface and converts the first excitation light and the second excitation light in term of wavelength and emits fourth light having a fourth wavelength band, and a light combiner that combines the third light outputted from the third light source with the fourth light emitted from the wavelength converter to generate illumination light. The first excitation light outputted from the first light source is incident on the first surface of the wavelength converter via the light combiner, and the second excitation light outputted from the second light source is incident on the second surface of the wavelength converter.