Porous Wavelength Conversion Layer for Crack Resistance
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Solution Overview
Problem
Wavelength conversion layers produced by compression molding are brittle, prone to cracking, and unsuitable for curved substrates, with varying light brightness due to complex and inconsistent manufacturing processes, and high-power projectors experience thermal shock issues.
Innovation Solution
A manufacturing method involving a mixed solution of fluorescent material, binding material, and solvent with specific volume percentages, coated on a substrate and subjected to heat treatment to create a wavelength conversion layer with 10-30% porosity, enhancing toughness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compression molding is used to form the wavelength conversion layer, then the porosity is reduced (less than 3%), but the toughness deteriorates and the layer becomes brittle and prone to cracking
Solution Approach 1:
The patent changes the porosity parameter from the conventional less than 3% to 10-30% range. This parameter change fundamentally alters the mechanical properties of the wavelength conversion layer, improving toughness and resistance to cracking while maintaining manufacturing precision through controlled formation processes.
Solution Approach 2:
The patent uses a composite structure consisting of the wavelength conversion layer formed on a substrate through a specific process that creates a porous composite material. This composite structure combines the wavelength conversion functionality with enhanced mechanical toughness through the controlled porosity of 10-30%.
2Manufacturing precision
If compression molding is used to form the wavelength conversion layer, then the porosity is reduced (less than 3%), but the adaptability to curved surfaces deteriorates
Solution Approach 1:
By changing the porosity parameter to 10-30%, the patent creates a wavelength conversion layer with improved flexibility and adaptability to curved surfaces. The increased porosity allows the layer to conform to non-planar geometries while maintaining manufacturing precision through controlled formation processes.
3Manufacturing precision
If compression molding is used to form the wavelength conversion layer, then the porosity is reduced (less than 3%), but the thermal shock resistance deteriorates causing cracking in high-power projectors
Solution Approach 1:
The patent changes the porosity parameter to 10-30% to improve thermal shock resistance. The porous structure acts as a buffer against thermal expansion stresses, preventing cracking in high-power projector applications while maintaining controlled manufacturing precision.
4Manufacturing precision
If the manufacturing process is made complex, then the manufacturing precision of individual layers may be improved, but the batch consistency deteriorates causing varied light brightness
Solution Approach 1:
The patent simplifies the manufacturing process while controlling the porosity parameter at 10-30% to achieve both good layer quality and batch consistency. This parameter control enables reproducible results across different batches, ensuring uniform light brightness output.
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 method results in a wavelength conversion layer with improved toughness, reduced cracking risk, and stable optical quality, leading to enhanced image brightness and consistency across different batches.
Implementation Method 1
A heat treatment is performed on the mixed solution at a first temperature to form a wavelength conversion layer. The first temperature is higher than a boiling point of the solvent, and the wavelength conversion layer has a porosity of 10% to 30%.
Data Source
AI summary
The invention relates to a wavelength conversion device and a manufacturing method thereof. The manufacturing method includes: mixing a fluorescent material, a binding material, and a solvent to form a mixed solution. The volume percentage concentration of the fluorescent material is about 50% to 80%, the volume percentage concentration of the binding material is 10% to 40%, and the volume percentage concentration of the solvent is 10% to 30%. The mixed solution is coated on the substrate. A heat treatment is performed on the mixed solution at a first temperature to form a wavelength conversion layer. The first temperature is higher than the boiling point of the solvent, and the wavelength conversion layer has a porosity of 10% to 30%. The wavelength conversion device manufactured by the manufacturing method of the invention has better toughness, and may provide stable optical quality and improve image brightness.