Wavelength Conversion Device Antenna Array Segmentation
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Solution Overview
Problem
In existing illumination devices, a significant portion of primary light is absorbed or reflected by the antenna array, leading to reduced light extraction efficiency and potential color separation issues due to mismatched light distributions between primary and secondary light.
Innovation Solution
The wavelength conversion device incorporates a phosphor plate with a plate shape and a plurality of antennas, featuring an antenna array in one region and no antenna array in another, optimizing the optical path length to enhance light extraction efficiency and maintain directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an antenna array is used to improve light extraction efficiency, then light extraction efficiency is improved, but primary light is absorbed or reflected rearward and lost
Solution Approach 1:
The phosphor plate is divided into two distinct regions: a first region with an antenna array structure that extracts wavelength-converted light, and a second region without the antenna array that transmits primary light. This segmentation allows each region to perform its specific function without interfering with the other, resolving the contradiction between light extraction efficiency and light output.
Solution Approach 2:
Different regions of the phosphor plate are given different optical properties: the first region has antenna structures optimized for extracting wavelength-converted light at large angles, while the second region maintains transparency for primary light transmission. This local differentiation of properties allows simultaneous optimization for both light extraction and light output.
2Shape
If the antenna array blocks part of the light-emitting surface, then directivity is improved, but light extraction efficiency decreases
Solution Approach 1:
The light-emitting surface is segmented into a first region with antenna array for directional wavelength-converted light extraction and a second region without antenna for primary light transmission. This segmentation ensures that the antenna array's directivity improvement does not come at the cost of blocking primary light.
Solution Approach 2:
The antenna array is configured to extract light primarily in lateral directions (large angles) while the second region transmits light in the forward direction. This dimensional separation of light extraction paths allows both functions to coexist without conflict.
3Ease of manufacture
If primary light reaches the light-emitting surface at a small incidence angle, then alignment with optical axis is improved, but light extraction is reduced due to antenna array absorption
Solution Approach 1:
The phosphor plate is segmented so that primary light transmitted through the second region (without antenna array) is not absorbed or reflected by the antenna structures. This segmentation protects optically aligned primary light from loss while still allowing the antenna array to function in the first region.
Solution Approach 2:
The harmful effect of the antenna array on primary light is eliminated by extracting (removing) the antenna array from the second region where primary light transmission occurs. This selective extraction of the antenna array structure resolves the conflict between optical alignment and light loss.
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 significantly improves light extraction efficiency by minimizing light loss due to the antenna array, while maintaining the directivity of the primary light and achieving desired color temperature and chromaticity.
Implementation Method 1
a wavelength converter having a plate shape and a plurality of antennas... The wavelength converter converts a wavelength of incident light that is incident from the light-receiving surface and generates a wavelength-converted light
Implementation Method 2
Light that is incident on an antenna array of a phosphor plate at a large angle from the inside with respect to a light-emitting surface of the antenna array is relatively easily extracted to the outside by an antenna function (resonance through localized surface plasmon resonance and optical diffraction)
Implementation Method 3
Light that is incident on an antenna array of a phosphor plate at a large angle from the inside with respect to a light-emitting surface of the antenna array is relatively easily extracted to the outside by an antenna function (resonance through localized surface plasmon resonance and optical diffraction)
Data Source
AI summary
A wavelength conversion device includes a wavelength converter having a plate shape and a plurality of antennas. The wavelength converter converts a wavelength of incident light and generates wavelength-converted light and emits the wavelength-converted light. The plurality of antennas are disposed on a light-emitting surface of the wavelength converter. The plurality of antennas form an antenna array in a first region of the light-emitting surface. The respective plurality of antennas are arranged with a predetermined period in the first region. The antenna array is absent in a second region outside the first region. An optical path length from a light-receiving surface of the wavelength converter to the light-emitting surface of the incident light that reaches a light-emitting surface of the first region is longer than an optical path length from the light-receiving surface to the light-emitting surface of the incident light that reaches a light-emitting surface of the second region.