Projector Light Source Optics for Fluorescence Leakage Extraction
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Solution Overview
Problem
In existing light source devices, fluorescence that leaks into the substrate due to being incident at Brewster's angle is not efficiently utilized, leading to reduced light use efficiency.
Innovation Solution
A light source device with a dichroic film and an uneven structure on the substrate surface to reflect and extract fluorescence that leaks into the substrate, enhancing light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dichroic layer is provided to extract fluorescent light in a desired direction, then the directional extraction of fluorescence is improved, but the light use efficiency is reduced due to P-polarized component leakage
Solution Approach 1:
A light-transmissive member is introduced as an intermediary between the dichroic layer and the external environment. This member has a refractive index higher than air and lower than the dichroic layer, creating a gradient that prevents total internal reflection of P-polarized fluorescence at the dichroic layer interface, thereby reducing light leakage while maintaining directional extraction capability
Solution Approach 2:
The refractive index parameter is strategically changed by introducing a light-transmissive member with intermediate refractive index properties. This parameter change modifies the optical conditions at the dichroic layer interface, preventing the P-polarized component from experiencing total internal reflection and improving overall light utilization efficiency
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 device increases the amount of fluorescence used as illumination light, resulting in brighter illumination by improving light use efficiency.
Implementation Method 1
a wavelength conversion layer that converts the first light incident from the light source into second light having a wavelength band different from that of the first light
Implementation Method 2
the P-polarized component incident at Brewster's angle is transmitted through the dichroic layer
Implementation Method 3
the P-polarized component incident at Brewster's angle is transmitted through the dichroic layer
Implementation Method 4
The fluorescence leaking into the substrate propagates through the substrate by total reflection, and is emitted from the side surface of the substrate to the outside
Data Source
AI summary
A light source device includes a light source that emits first light, a wavelength conversion layer that converts the first light incident from the light source into second light having a wavelength band different from that of the first light, a light transmissive substrate having a first surface and a second surface opposite to the first surface, the wavelength conversion layer being provided on the first surface side, a dichroic film that is provided between the first surface of the light transmissive substrate and the wavelength conversion layer, transmits the first light, and reflects the second light, and an uneven structure provided on the first surface side of the light transmissive substrate.