Wavelength Conversion Element with Movable Dichroic Film
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Solution Overview
Problem
Illumination devices used in projectors face challenges in adjusting color balance due to aging, as existing techniques cannot dynamically adjust color balance after shipment.
Innovation Solution
A wavelength conversion element with a dichroic film having a reflectance distribution along a predetermined direction, allowing for adjustment of light reflection by moving the irradiated region, combined with a diffusion section to scatter light and reduce color unevenness, is integrated into an illumination device with a drive device to move the dichroic film and adjust the incident position of excitation light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed wavelength conversion layer is used, then the structure is simple and easy to manufacture, but color balance cannot be adjusted after shipment due to aging
Solution Approach 1:
The patent introduces a movable base material that can shift the wavelength conversion layer relative to the excitation light incident position. This dynamic adjustment mechanism allows the system to adapt color balance after shipment by compensating for aging effects, while maintaining a relatively simple overall structure without requiring complex active control systems.
Solution Approach 2:
The patent creates a reflectance distribution across different regions of the wavelength conversion layer by controlling phosphor particle density or size distribution. This local variation in optical properties enables different portions of the layer to contribute differently to color balance, providing adjustment capability while keeping the overall device simple.
2Manufacturing precision
If the reflectance distribution is continuous, then color balance can be accurately adjusted, but manufacturing complexity increases
Solution Approach 1:
The patent achieves reflectance distribution by varying parameters such as phosphor particle density, particle size, or concentration across different regions of the wavelength conversion layer. This approach enables continuous or discontinuous reflectance profiles to be created through manufacturing parameter control, balancing adjustment precision with ease of manufacture depending on the specific application requirements.
3Reliability
If no diffusion section is provided, then the device structure is simpler, but color unevenness occurs in the reflected light
Solution Approach 1:
The patent introduces a diffusion section as an intermediary element between the wavelength conversion layer and the reflected light path. This diffusion section scatters the reflected light to homogenize illuminance distribution and reduce color unevenness, while adding minimal structural complexity to the overall device.
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 enables accurate and reliable adjustment of color balance in illumination light, minimizing color deviations and reducing manufacturing costs through continuous or discontinuous reflectance distribution in the dichroic film, while maintaining uniform illuminance distribution.
Implementation Method 1
a wavelength conversion layer provided between the light-reflecting surface and the dichroic film
Implementation Method 2
a dichroic film reflecting portion of light in a wavelength band that the wavelength conversion layer absorbs and having a reflectance distribution with respect to the light along a predetermined direction
Implementation Method 3
a diffusion section provided between the wavelength conversion layer and the dichroic film
Data Source
AI summary
The invention relates to a wavelength conversion element including: a base material including a light-reflecting surface; a dichroic film; and a wavelength conversion layer provided between the light-reflecting surface and the dichroic film. The dichroic film reflects portion of light in a wavelength band that the wavelength conversion layer absorbs, and has a reflectance distribution, with respect to the light along a predetermined direction.