Aspherical Lens Array Illumination System for Phosphor Thermal Management
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Solution Overview
Problem
High energy density of the light beam incident on the phosphor layer in projection devices leads to thermal energy accumulation, reducing conversion efficiency and potentially damaging the phosphor layer, as existing systems lack effective heat dissipation mechanisms.
Innovation Solution
Incorporating a lens array with aspherical surfaces in the illumination system to distribute the energy more evenly, reducing the energy density at the central region and preventing damage to the phosphor layer, while improving conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light integration rod is used to uniformize the fluorescent light beam, then uniform output brightness is achieved, but thermal energy accumulation on the phosphor layer increases, reducing conversion efficiency and potentially damaging the phosphor layer
Solution Approach 1:
The illumination system is divided into multiple independent optical components: light source, lens array, condenser lens, and wavelength conversion element. The lens array segments the light beam into multiple sub-beams that are distributed across different spatial regions, preventing concentration of thermal energy on a single phosphor layer while maintaining uniform illumination output.
Solution Approach 2:
A lens array is introduced as an intermediary component between the light source and the wavelength conversion element. The lens array acts as a mediator that redistributes the light beam spatially, reducing energy density at any single point on the phosphor layer while preserving the overall uniform brightness output required for projection.
2Illumination intensity
If the light beam energy density is increased to improve illumination intensity, then brighter projection is achieved, but thermal energy on the phosphor layer increases, causing reduced conversion efficiency and potential damage
Solution Approach 1:
The lens array creates non-uniform spatial distribution of light energy, with different regions receiving different energy densities. This local variation in energy distribution prevents any single region of the phosphor layer from experiencing excessive thermal energy, while the overall integrated brightness remains sufficient for bright projection.
Solution Approach 2:
The problem is solved by transitioning from a single-point energy concentration to a multi-dimensional spatial distribution. The lens array spreads the light beam across multiple spatial dimensions and regions, distributing thermal energy over a larger volume and surface area of the phosphor layer, thereby reducing peak temperature and preventing damage.
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 aspherical lens array design effectively reduces thermal energy accumulation and enhances the conversion efficiency of the phosphor layer, preventing damage and ensuring stable light beam projection.
Implementation Method 1
Each of the first surfaces or each of the second surfaces is an aspherical surface
Implementation Method 2
The lens array is disposed on a transmission path of the light beam
Implementation Method 3
The condenser lens is disposed on the transmission path of the light beam and for receiving the light beam passing through the lens array and converting the light beam into a condenser light beam
Implementation Method 4
The wavelength conversion element is for receiving the condenser light beam and converting at least a portion of the condenser light beam into a converted light beam
Implementation Method 5
The light valve is disposed on a transmission path of the converted light beam and for converting the converted light beam into an image light beam
Data Source
AI summary
A projection device includes an illumination system, a light valve, and a projection lens. The illumination system includes a light source, a lens array, a condenser lens, and a wavelength conversion element. The light source is for providing a light beam. The lens array and the condenser lens are disposed on a transmission path of a light beam. The condenser lens is for receiving the light beam passing through the lens array and converting the light beam into a condenser light beam. The wavelength conversion element is for receiving the condenser light beam and converting at least a portion thereof into a converted light beam. The projection device and the illumination system provided by the invention can effectively improve the conversion efficiency of the wavelength conversion element and prevent the wavelength conversion element from damage, and effectively project the converted light beam generated by the wavelength conversion element.