Angle-Dependent Optical Layer for Wavelength Conversion
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Solution Overview
Problem
Existing illumination devices face inefficiencies in light use due to insufficient scattering control of light with a first wavelength, leading to decreased light extraction efficiency and reduced luminance.
Innovation Solution
A wavelength conversion element comprising a substrate, a reflecting layer, a wavelength conversion layer, and an optical layer with a half mirror layer that scatters and reflects light in the first wavelength band, with varying reflectance based on incidence angle, enhancing light distribution towards oblique directions and reducing loss through dichroic mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light diffusion surface is used to scatter light in the first wavelength band, then some light scattering is achieved, but the scattering angle is insufficient and light use efficiency decreases
Solution Approach 1:
The patent changes the optical parameters of the system by introducing an optical layer with angle-dependent reflectance characteristics. This layer selectively reflects light at specific incidence angles while transmitting other angles, thereby controlling the scattering angle and direction of light in the first wavelength band to achieve both adequate scattering and high light use efficiency
Solution Approach 2:
The patent employs a composite structure consisting of multiple functional layers: a wavelength conversion layer, a light diffusion layer, and an optical layer with specific reflectance characteristics. This composite arrangement enables the system to simultaneously achieve light scattering, wavelength conversion, and efficient light extraction by optimizing each layer's contribution
2Stability of the object's composition
If light is scattered to improve distribution, then illumination uniformity improves, but light loss increases due to insufficient scattering control
Solution Approach 1:
The patent applies local quality by making different regions of the optical system have different optical properties. The optical layer is designed to have specific reflectance characteristics at different incidence angles, creating localized light redirection that achieves uniform illumination distribution while minimizing overall light loss through precise angular control
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 solution increases light use efficiency by directing scattered light away from dichroic mirrors, enhancing luminance and reducing power consumption while maintaining high reflectance for obliquely incident light, thus improving projector performance.
Implementation Method 1
a wavelength conversion layer 23 which is disposed on the reflecting layer 22 and has a function of converting light in a first wavelength band into light in a second wavelength band
Implementation Method 2
a structure 24 which is disposed on the wavelength conversion layer 23 and has a function of scattering light in the first wavelength band
Implementation Method 3
an optical layer 25 which is disposed on the structure 24 and reflects a part of light in the first wavelength band, transmits the other part of light in the first wavelength band, and transmits light in the second wavelength band
Data Source
AI summary
A wavelength conversion element according to the present disclosure includes a substrate, a reflecting layer, a wavelength conversion layer which is disposed on the reflecting layer, and which is configured to convert light in a first wavelength band into light in a second wavelength band, a structure which is disposed on the wavelength conversion layer, and which is configured to scatter the light in the first wavelength band, and an optical layer which is disposed on the structure, and which is configured to reflect a part of the light in the first wavelength band, transmit another part of the light in the first wavelength band, and transmit the light in the second wavelength band, wherein the optical layer is different in reflectance with respect to the light in the first wavelength band in accordance with an incidence angle of the light in the first wavelength band entering the optical layer.