Fluorescent Substrate With Liquid Crystal Fixing Layer
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Solution Overview
Problem
The existing light source devices for projection displays face issues with luminance saturation and temperature quenching, leading to reduced fluorescence conversion efficiency due to thermal expansion, which causes warpage and displacement of the focal position, especially when the fluorescent layer is fixed to the substrate using adhesives or direct bonding techniques.
Innovation Solution
A fluorescent substrate with a rotatable substrate configuration, where the fluorescent layer is centered and fixed to the substrate using a fixing layer, reducing thermal expansion-induced displacement and improving luminescence conversion efficiency by efficient heat transfer through thermally conductive materials and junction surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fluorescent layer is fixed to the substrate using adhesive layer or direct bonding, then the fluorescent layer is securely attached to the substrate, but warpage occurs in the substrate due to thermal expansion stress, leading to displacement of focal position and deterioration in fluorescence conversion efficiency
Solution Approach 1:
The patent changes the physical state of the bonding interface by introducing a liquid crystal layer that transitions from isotropic to anisotropic state under applied voltage. This parameter change allows the liquid crystal to optically compensate for the warpage caused by thermal expansion, maintaining focal position accuracy while preserving strong bonding between the fluorescent layer and substrate
Solution Approach 2:
The liquid crystal layer acts as an intermediary between the fluorescent layer and the observation/optical system. It mediates the optical path by compensating for phase differences caused by substrate warpage, thereby maintaining image quality and focal position accuracy despite the physical bonding between layers
2Illumination intensity
If the output of excitation light is raised to improve brightness, then the light output increases, but conversion loss changes into heat causing temperature quenching and deterioration in fluorescence conversion efficiency
Solution Approach 1:
The patent replaces conventional thermal management approaches with an optical compensation mechanism. Instead of mechanically cooling the system or using heat sinks, it uses the liquid crystal's optical anisotropy to compensate for thermal effects, allowing high power operation while maintaining efficiency through optical path correction
Solution Approach 2:
The liquid crystal undergoes phase transition from isotropic to anisotropic state under applied voltage, enabling it to compensate for optical path differences caused by thermal expansion. This phase transition allows the system to maintain fluorescence conversion efficiency even at high excitation light outputs where thermal effects are significant
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 configuration effectively reduces thermal expansion-induced displacement of the fluorescent layer, maintaining focal position stability and enhancing the efficiency of the light source device by minimizing thermal resistance and improving heat dissipation.
Implementation Method 1
a liquid crystal layer having anisotropy, configured to compensate for a phase difference caused by warpage of the substrate
Implementation Method 2
a fluorescent layer disposed in a center of the substrate... a light source that irradiates the fluorescent layer with excitation light
Implementation Method 3
provided on a surface of a substrate having high thermal conductivity
Data Source
AI summary
A fluorescent substrate according to one embodiment of the present disclosure includes: a substrate that is in a rotatable manner; a fluorescent layer disposed in a center of the substrate; and a fixing layer that fixes a portion of a surface on side on which the fluorescent layer is located of the substrate and a portion of a surface on side on which the substrate is located of the fluorescent layer to each other. Thus, in a case where warpage occurs in the substrate due to a stress caused by thermal expansion arising in each of the fluorescent layer and the substrate, it is possible to reduce an amount of displacement of the fluorescent layer.