Movable Notch Filter for Projector Luminosity and Chromaticity Tradeoff
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projectors face a tradeoff between intensity and chromaticity, limiting their application range as they are designed for specific conditions, and struggle to adapt to various situations requiring different luminosity and color gamut.
Innovation Solution
A projector design incorporating a light-emitting device, color wheel, notch filter, and switching module, where the notch filter with cut-off wavebands can be moved to adjust intensity and chromaticity by controlling the light emitted, allowing the projector to switch between high intensity and high chromaticity modes without changing the color wheel or light modulating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional projectors are designed with high intensity, then luminosity is improved, but chromaticity (color gamut) is narrowed
Solution Approach 1:
The patent implements a movable notch filter that can be dynamically positioned into or out of the light path based on projection needs. When the notch filter is in the light path, it narrows the spectral bandwidth to improve chromaticity for video content. When moved out of the light path, full spectral bandwidth is available for high luminosity text projection. This dynamic reconfiguration allows the single projector to adapt between high intensity and high chromaticity modes.
Solution Approach 2:
The patent changes the spectral parameters of the projected light by introducing a notch filter with specific cut-off wavelengths. The filter modifies the light spectrum by blocking specific wavelength ranges, thereby transforming the broad-spectrum light into a narrower spectral bandwidth that enhances color separation and chromaticity while maintaining acceptable luminosity levels.
2Adaptability or versatility
If conventional projectors are designed with wide color gamut, then chromaticity is improved, but intensity is reduced
Solution Approach 1:
The system dynamically switches between chromaticity-optimized and intensity-optimized configurations by moving the notch filter. For video content requiring wide color gamut, the filter is positioned in the light path to narrow spectral bandwidth and improve color separation. For text projection requiring high luminosity, the filter is moved out of the light path to maximize light transmission, demonstrating dynamic adaptation to different operational requirements.
Solution Approach 2:
The single projector system achieves multi-functionality by incorporating a movable notch filter that enables it to perform both high-chromaticity video projection and high-luminosity text projection. The same optical components serve dual purposes depending on the position of the notch filter, eliminating the need for separate projector designs for different application scenarios.
3Adaptability or versatility
If a single projector design is used for various conditions, then adaptability is improved, but performance under specific conditions deteriorates
Solution Approach 1:
The movable notch filter enables the projector to dynamically adapt its optical characteristics to match specific projection conditions. The system maintains reliable performance across different applications by switching between two optimized states: high chromaticity mode for video content and high luminosity mode for text content, rather than attempting to optimize for both simultaneously in a static design.
Solution Approach 2:
The patent applies local quality modification by introducing a notch filter that selectively modifies specific wavelength regions of the spectrum. The filter's cut-off wavelengths are specifically designed to block problematic spectral regions while preserving useful wavelengths, thereby locally optimizing the spectral distribution for different projection content types without completely redesigning the entire optical system.
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
Enables the projector to be adapted for various projection circumstances, achieving high luminosity or chromaticity as needed, with the light controller optimizing intensity and color purity, thus expanding its application range.
Implementation Method 1
The notch filter has two cut-off wavebands, each located between adjacent two of the color wavebands... one of the cut-off wavebands is located between the red waveband and the green waveband, and the other one is located between the green waveband and the blue waveband
Implementation Method 2
The color wheel is disposed on a path of the light and is configured to produce lights with different color wavebands
Implementation Method 3
The light-emitting device is configured to emit a light
Data Source
AI summary
A projector includes a light-emitting device, a color wheel, a notch filter, a switching device, and a light controller. The light-emitting device is configured to emit a light. The color wheel is disposed on a path of the light and is configured to produce lights with different color wave bands. The notch filter has two cut-off waveband, and each is located between adjacent two of the color wavebands. The switching module is configured to move the notch filter to or away the path of the light. The light controller is electrically connected to the light-emitting device and the switching module, and is configured to control an intensity of the light emitted by the light-emitting device.