Light Source Device Supplementary Light Scattering Color Wheel
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Solution Overview
Problem
Current laser fluorescent light sources face limitations in expanding color gamut while maintaining brightness due to excessive filtering, leading to inefficient light combination and increased costs for larger color gamuts like Rec. 2020.
Innovation Solution
A light source device combines supplementary light with excited light using a scattering layer on a reflective color wheel, increasing the proportion of supplementary light and reducing losses, thereby enhancing light efficiency and meeting wide color gamut standards without the inefficiencies of existing etendue-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a notch filter is used to filter out long wavelength green light and short wavelength red light, then color coordinates are improved, but light efficiency decreases
Solution Approach 1:
The color wheel is divided into multiple regions including a supplementary light-processing region with a scattering layer, allowing different portions of the optical spectrum to be processed differently. This segmentation enables selective transmission and scattering of light wavelengths without requiring aggressive filtering.
Solution Approach 2:
A scattering layer is introduced as an intermediary element in the supplementary light-processing region. This scattering layer mediates the interaction between supplementary light and excited light, enabling combination while maintaining high light efficiency through spatial distribution rather than spectral filtering.
2Manufacturing precision
If electronic correction is used to filter out excessive green light, then color gamut standard is met, but light efficiency decreases
Solution Approach 1:
The color wheel is divided into multiple regions including a supplementary light-processing region with a scattering layer, allowing different portions of the optical spectrum to be processed differently. This segmentation enables selective transmission and scattering of light wavelengths without requiring aggressive filtering.
Solution Approach 2:
The patent changes the optical parameters by introducing a scattering layer that modifies the spatial distribution of light rather than relying on spectral filtering. This parameter change allows the system to meet color gamut standards while preserving light efficiency through physical light distribution changes.
3Manufacturing precision
If a red laser module is added to increase red light proportion, then color gamut is expanded, but device complexity increases
Solution Approach 1:
The color wheel is designed to serve multiple functions: it acts as both a wavelength conversion element and a light combining element with a scattering layer. This multi-functionality allows the system to expand color gamut without adding separate laser modules, reducing device complexity.
Solution Approach 2:
The patent merges the supplementary light source with the existing excited light path through the scattering layer in the color wheel. This combining approach integrates multiple light sources into a single optical path, avoiding the complexity of managing separate laser modules while achieving expanded color gamut.
4Loss of energy
If etendue-based light combination is used to reduce fluorescent light loss, then light efficiency improves, but scattered light combines with excited light causing color mixing issues
Solution Approach 1:
The color wheel is divided into multiple regions including a supplementary light-processing region with a scattering layer, allowing different portions of the optical spectrum to be processed differently. This segmentation enables selective transmission and scattering of light wavelengths without requiring aggressive filtering.
Solution Approach 2:
A scattering layer is introduced as an intermediary element in the supplementary light-processing region. This scattering layer mediates the interaction between supplementary light and excited light, enabling combination while maintaining high light efficiency through spatial distribution rather than spectral filtering.
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 approach effectively increases the proportion of supplementary light, reduces excited light loss, and improves light efficiency, making it practical for high color gamut applications like Rec. 2020 while maintaining brightness and cost-effectiveness.
Implementation Method 1
The supplementary light is transmitted and scattered through the scattering layer to complete combination of the supplementary light and the excited light
Implementation Method 2
The excitation light incident on a color wheel excites fluorescent powder to obtain a green fluorescent light and a red fluorescent light
Data Source
Figure 1~3a
Figure 3b
Figure 4
AI summary
A light source device (100) and a display apparatus. The light source device (100) comprises an excitation light source (101), a supplementary light source (102) and a color wheel (108). The excitation light source (101) is used to emit a first color light beam to the color wheel (108). The color wheel (108) comprises a first light emission region (108a), a wavelength conversion region (108b) and a supplementary light emission region (108c). The first light emission region (108a) and the wavelength conversion region (108b) are concentrically arranged in a circumferential direction. The first light emission region (108a) receives the first color light beam in a first time period and emits the first color light beam. The wavelength conversion region (108b) receives the first color light beam in a second time period and emits an excited light beam. The supplementary light emission region (108c) is positioned at an inner side or an outer side of the wavelength conversion region (108b). The supplementary light source (102) emits, in the second time period, a supplementary light beam having an extended color gamut and a spectrum at least partially overlapping with a spectrum of the excited light beam. After emitted from the supplementary light emission region (108c), the supplementary light beam is combined with the excited light beam emitted from the wavelength conversion region (108b).