Fluorescence Light Source Using Titanium Oxide Reflection
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Solution Overview
Problem
Conventional projection type display apparatuses face limitations in achieving high reflectivity and cost-effectiveness due to the use of silver for reflecting surfaces, which are expensive, require complex substrate preparation, and suffer from thermal oxidation issues.
Innovation Solution
A light source device employing a fluorescence light-emitting plate with a reflection section containing titanium oxide, which enhances reflectivity and reduces costs by utilizing a more affordable and oxidation-resistant material, improving the conversion efficiency of fluorescence emission light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If silver is used for the reflecting surface, then reflectivity is improved (approximately 95%), but cost increases and thermal oxidation resistance deteriorates
Solution Approach 1:
The patent replaces expensive silver with a cheaper alternative material that provides comparable reflectivity performance. The reflecting surface is formed using a cost-effective material that eliminates the need for expensive silver while maintaining the required optical performance and adding thermal oxidation resistance.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers including the reflecting surface layer, protective film layer, and fluorescent substance layer. This composite approach allows combining materials with different properties - the reflecting surface provides high reflectivity, the protective film provides oxidation resistance, and the fluorescent layer provides light emission functionality.
2Illumination intensity
If silver vapor deposition is used to form the reflecting surface, then reflectivity is improved, but manufacturing complexity and cost increase due to substrate preparation requirements
Solution Approach 1:
The patent replaces the complex silver vapor deposition process with a simpler, more cost-effective method for forming the reflecting surface. The new approach eliminates the need for expensive vacuum deposition equipment and complex substrate preparation procedures while achieving comparable or superior reflectivity performance.
Solution Approach 2:
The patent replaces the mechanical/physical vapor deposition process with an alternative method that is easier to manufacture. The reflecting surface is formed using a process that does not require vacuum deposition equipment or complex substrate flatness control, thereby simplifying the manufacturing system.
3Reliability
If protective films are added to prevent thermal oxidation of silver, then reliability is improved, but cost and manufacturing complexity increase
Solution Approach 1:
The patent eliminates the need for expensive protective films by using a base material that inherently resists thermal oxidation. The reflecting surface is formed using a material that does not require additional protective coatings to prevent oxidation, thereby reducing the number of layers and simplifying the overall structure.
Solution Approach 2:
The patent removes the protective film layer from the structure by selecting a reflecting surface material that has built-in oxidation resistance. This extraction of the protective film function from a separate layer integrates it into the base material, thereby reducing device complexity and the number of manufacturing steps.
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 use of titanium oxide in the reflection section achieves higher reflectivity and cost reduction, while providing thermal and oxidation resistance, thus enhancing the luminance and efficiency of the light source device.
Implementation Method 1
a fluorescence light-emitting plate including a fluorescence light-emitting section arranged opposite to the excitation light source... onto which excitation light from the semiconductor light-emitting element is projected so that fluorescence emission light is emitted
Implementation Method 2
a reflection section containing titanium oxide located on the opposite side of the excitation light source as viewed from the side of the fluorescence light-emitting section... for the purpose of improving utilization of reflected light
Data Source
AI summary
A light source device and a projection type display apparatus include: an excitation light source; and a fluorescence light-emitting plate including a fluorescence light-emitting section arranged opposite to the excitation light source and a reflection section containing titanium oxide located on the opposite side of the excitation light source as viewed from the side of the fluorescence light-emitting section and arranged such as to be joined to the fluorescence light-emitting section. Then, excitation light from the excitation light source is projected onto the fluorescence light-emitting section so that fluorescence emission light is emitted from the fluorescence light-emitting section and reflected fluorescence light is emitted from the reflection section.