Projector Light Guide Layout for Fluorescent Light Extraction
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Solution Overview
Problem
The utilization efficiency of fluorescent light is reduced in existing light source devices due to components of the fluorescent light leaking out from the interface between the wavelength conversion member and the air layer at angles less than the critical angle, preventing total reflection and emission from the designed emission surface.
Innovation Solution
A light source device with a first light source emitting first light, a first wavelength conversion element, a first optical layer, a light guide section, and a second light source, where the first optical layer transmits the first light and reflects converted second light, and the light guide section guides and emits light from a specific region, enhancing light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the excitation light is incident from a large area incidence surface, then the light source device can generate sufficient fluorescent light, but components of the fluorescent light leak out from the interface between the wavelength conversion member and the air layer at angles less than the critical angle, reducing utilization efficiency
Solution Approach 1:
A light guide member is introduced as an intermediary between the wavelength conversion member and the external environment. This light guide member has a refractive index different from both the wavelength conversion member and air, serving as an optical mediator that enables total reflection at its interface with the wavelength conversion member while allowing controlled extraction of fluorescent light, thereby preventing light leakage and improving utilization efficiency
Solution Approach 2:
The refractive index parameter is strategically utilized by selecting a light guide member material whose refractive index creates appropriate optical conditions. By changing the refractive index relationship between materials, the system achieves total reflection for angles less than the critical angle at the wavelength conversion member interface, while still allowing light extraction at the light guide member's external interface, thus resolving the contradiction between light generation and light utilization efficiency
2Area of stationary object
If fluorescent light is emitted from a small area emission surface, then the light source device can maintain a compact structure, but the utilization efficiency of fluorescent light is reduced due to leakage at the wavelength conversion member interface
Solution Approach 1:
The light guide member acts as an intermediary that decouples the emission surface area from the utilization efficiency problem. By introducing this intermediate optical element, the system can maintain a compact small-area emission surface while the light guide member's optical properties ensure that fluorescent light is properly guided and extracted, preventing the efficiency loss that would otherwise occur at the wavelength conversion member interface
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 improves the efficiency of fluorescent light utilization by guiding and emitting light from a designated region, reducing losses and enhancing the overall light output.
Implementation Method 1
a first optical layer that is disposed between the first light source and the first wavelength conversion element and that is configured to transmit the first light and reflect the second light
Implementation Method 2
a first wavelength conversion element configured to convert the first light into second light in a second wavelength band different from the first wavelength band of the first light
Implementation Method 3
the fluorescent light generated inside the wavelength conversion member propagates inside the wavelength conversion member by total reflection at the interface between the upper surface of the wavelength conversion member and the air layer
Data Source
AI summary
A light source device includes a first light source for emitting first light, a first wavelength conversion element for converting the first light into second light, a first optical layer for transmitting the first light and reflecting the second light, a second light source for emitting third light, and a light guide section for guiding the second light and the third light. The first wavelength conversion element has a first surface on which the first light is incident via the first optical layer, and a second surface and a third surface which intersect the first surface and face away from each other. The second light source is disposed in a region on the second surface side of the light guide section. The first optical layer reflects the third light in addition to the second light, and a portion of the second light and the third light travels through the light guide section and is emitted from the region on the third surface side of the light guide section.