Light Source Module Wavelength Selector for Projector Color Gamut
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Solution Overview
Problem
Current projectors using two light valves face limitations in expanding their color gamut due to the mixing of blue light with other colors, which reduces color reproducibility and luminous efficiency.
Innovation Solution
A light source module comprising a wavelength conversion section with a fluorescent substance region and a reflection region, along with a region-division wavelength selector, which spatially separates the blue light output from these regions by emitting it in different angular distributions, allowing selective removal of blue light and improving light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength conversion section with fluorescent substance region is used to generate yellow light, then color gamut is improved, but blue light leakage mixes with other colors reducing color reproducibility
Solution Approach 1:
The wavelength conversion section is divided into a fluorescent substance region and a reflection region, which spatially separate the blue light paths. The fluorescent substance region converts blue light to yellow light, while the reflection region reflects blue light at different angles, preventing blue light mixing with other color channels and improving color reproducibility.
Solution Approach 2:
Different regions of the wavelength conversion section are assigned different optical properties: the fluorescent substance region has fluorescent conversion properties while the reflection region has reflective properties. This local differentiation allows selective management of blue light in different spatial zones, eliminating harmful blue light mixing while maintaining wide color gamut.
2Device complexity
If blue light is not separated, then the optical system remains simple, but light use efficiency decreases due to wasted blue light
Solution Approach 1:
The reflection region is integrated into the wavelength conversion section, merging the blue light reflection function with the yellow light generation function in a single compact component. This combining approach improves blue light utilization efficiency without significantly increasing overall system complexity, as both functions share the same physical space and optical path.
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 enhances the color gamut and color reproducibility of projectors by effectively separating and managing blue light, leading to a compact high-luminance projector with improved color accuracy.
Implementation Method 1
a fluorescent substance region that absorbs the excitation light and outputs the first light together with the second light, the first light being fluorescent light in a different wavelength band from the excitation light
Implementation Method 2
a reflection region that outputs the excitation light as the second light in a different angular distribution from the second light output from the fluorescent substance region
Implementation Method 3
a region-division wavelength selector including a first region and a second region, the first region transmitting the first light and the second light, the second region reflecting or absorbing the second light selectively
Data Source
AI summary
A light source module includes: a light source section that emits excitation light; a wavelength conversion section that outputs first light and second light that are in mutually different wavelength bands; a fluorescent substance region that absorbs the excitation light and outputs the first light together with the second light, the first light being fluorescent light in a different wavelength band from the excitation light, the fluorescent substance region being provided in the wavelength conversion section; a reflection region that outputs the excitation light as the second light in a different angular distribution from the second light output from the fluorescent substance region, the reflection region being provided in the wavelength conversion section; and a region-division wavelength selector including a first region and a second region, the first region transmitting the first light and the second light, the second region reflecting or absorbing the second light selectively.