Image Projection Apparatus with Phosphor Wheel for Bright Visibility
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Solution Overview
Problem
Existing image projection apparatuses struggle to project images that are easily recognizable in bright environments due to insufficient brightness and visibility, particularly in applications where color gamut is not the primary concern.
Innovation Solution
The image projection apparatus emits and projects light that satisfies the condition A>B and A>C, where A denotes the radiation energy of light with wavelengths between 510 nm and 610 nm, B denotes the radiation energy of light with wavelengths less than 510 nm, and C denotes the radiation energy of light with wavelengths greater than 610 nm, utilizing a light source unit with a phosphor wheel and a projection optical system designed to enhance visibility and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light sources are used in image projection apparatuses, then the device can operate with standard brightness levels, but the projected images lack sufficient brightness and visibility in bright environments
Solution Approach 1:
The patent changes the spectral parameters of the light source by using a blue LED (438-445 nm) combined with specific phosphors (yellow phosphor with 560-580 nm peak, red phosphor with 610-650 nm peak) to create light with enhanced visibility characteristics. This parameter change in the light spectrum directly improves brightness and visibility in bright environments without requiring complex mechanical or optical modifications to the projection system.
2Illumination intensity
If the light source emits light across all visible wavelengths, then the device maintains broad spectral coverage, but the brightness and visibility in bright places is insufficient
Solution Approach 1:
The patent applies local quality by concentrating radiation energy in specific wavelength ranges that are most effective for visibility in bright environments. The light source is designed to emit predominantly in the blue (438-445 nm), yellow-green (560-580 nm), and red (610-650 nm) regions, rather than uniformly across all visible wavelengths. This localized energy distribution optimizes visibility while maintaining reasonable energy efficiency.
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 apparatus achieves significantly enhanced brightness and visibility, allowing images to be easily recognized even in bright places, with a brightness enhancement of up to nearly double the original brightness by primarily projecting light in the green to yellow wavelength range.
Implementation Method 1
a light source unit (20) to emit light
Data Source
AI summary
An image projection apparatus includes a light source to emit light, an image display element, and a projection optical system. The image display element modulates the light emitted from the light source unit to form an image with the modulated light. The projection optical system projects the image formed by the image display element. Both the light emitted from the light source and the image projected by the projection optical system satisfy A>B and A>C, where A denotes a radiation energy of light having a wavelength of 510 nm or more and 610 nm or less, B denotes a radiation energy of light having a wavelength of less than 510 nm, and C denotes a radiation energy of light having a wavelength of greater than 610 nm.