Projector Selective Polarization for Dual-Light Image Adjustment
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Solution Overview
Problem
Existing projectors face challenges in accurately reproducing the movement or deviation of projection images due to optical path discrepancies between visible and invisible light paths, making precise adjustment difficult.
Innovation Solution
A projector design that combines visible and invisible light using a first light combining element, with polarizing plates that transmit and polarize visible light while maintaining an unpolarized state for invisible light, and a movement mechanism controlled by an imaging device to adjust the projection image based on invisible light imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical path of invisible light is arranged at a position different from the optical path of visible light, then the structure can be simplified, but the projection image cannot be accurately adjusted due to inability to reproduce movement or deviation
Solution Approach 1:
The patent merges the optical paths of visible and invisible light by making them substantially coincide, allowing both types of light to travel through the same optical components (lenses, mirrors, etc.). This enables the invisible light projection image to accurately reproduce movement and deviation of the visible light projection image, solving the adjustment accuracy problem while maintaining structural simplicity.
2Illumination intensity
If polarizing plates are used to transmit visible light, then visible light can be effectively modulated, but invisible light may be affected by polarization
Solution Approach 1:
The patent applies different optical properties to different wavelength ranges by using polarizing plates that are selectively transparent to invisible light while polarizing visible light. This local differentiation in optical treatment allows effective visible light modulation through polarization while maintaining stable invisible light transmission without polarization effects.
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
Accurately adjusts and reproduces the projection image by correcting optical path discrepancies, ensuring precise alignment and visibility of both visible and invisible light components.
Implementation Method 1
a first light combining element configured to combine the first light and the invisible light into first combined light
Implementation Method 2
a first liquid crystal panel configured to modulate the first combined light
Implementation Method 3
a first incident-side polarizing plate configured to transmit the first combined light at a light incident side of the first liquid crystal panel, in which at least one of the first incident-side polarizing plate and the first emission-side polarizing plate polarizes and transmits the first light and transmits the invisible light without polarizing the invisible light
Data Source
AI summary
A projector includes: visible light source device configured to emit visible light containing first light having first wavelength; invisible light source device configured to emit invisible light; first light combining element configured to combine first light and invisible light into first combined light; first liquid crystal panel configured to modulate the first combined light; first incident-side polarizing plate configured to transmit the first combined light at a light incident side of the first liquid crystal panel; first emission-side polarizing plate configured to transmit the first combined light at a light emission side of the first liquid crystal panel; and projection optical system configured to project the first combined light emitted from the first liquid crystal panel, in which at least one of the first incident-side polarizing plate and the first emission-side polarizing plate polarizes and transmits the first light and transmits the invisible light without polarizing the invisible light.