Stereoscopic Imaging With Passive Interference Filters
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Solution Overview
Problem
Traditional stereoscopic imaging systems face challenges with high cost and reduced brightness and optical efficiency due to the use of active shutter glasses and passive polarization glasses, respectively.
Innovation Solution
A method and system utilizing narrowband light beams of different wavelengths and colors, modulated based on image data, and passed through passive glasses with built-in interference filters to separate and display stereoscopic images effectively, enhancing brightness and optical efficiency while eliminating the need for active shutter technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active shutter glasses are used for stereoscopic imaging, then stereoscopic visualization is achieved, but cost increases and artificial flickers are introduced
Solution Approach 1:
The patent replaces the mechanical active shutter system with an optical filtering system. Instead of using electronically controlled shutters that mechanically open and close, the invention uses passive interference filters that pass specific wavelengths of light. This substitution eliminates the mechanical complexity and cost of active shutter components while maintaining stereoscopic separation through optical means.
Solution Approach 2:
The patent utilizes wavelength-selective interference filters that allow specific colors (wavelengths) to pass through while blocking others. By assigning different color filters to left and right eyes, the system achieves stereoscopic separation without mechanical shutters. The filters dynamically select which wavelengths reach each eye based on the displayed image wavelengths, enabling cost-effective stereoscopic imaging.
2Device complexity
If passive polarization glasses are used for stereoscopic imaging, then cost is reduced, but brightness and optical efficiency are significantly reduced
Solution Approach 1:
The patent changes the optical parameter from polarization (which blocks half the light) to wavelength selectivity through interference filters. Instead of using polarizing filters that inherently lose 50% of light intensity, the invention uses interference filters that can be designed to pass specific wavelengths with minimal loss. This parameter change maintains cost-effectiveness while dramatically improving brightness and optical efficiency.
3Device complexity
If passive polarization glasses are used for stereoscopic imaging, then cost is reduced, but artificial effects and brightness reduction occur
Solution Approach 1:
The patent substitutes the polarization-based optical system with a wavelength-selective interference filter system. This replacement eliminates the inherent brightness loss associated with polarization filtering, as interference filters can be designed to transmit specific wavelengths with minimal absorption, thereby eliminating the harmful brightness reduction effect while maintaining low cost.
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 solution enables cost-effective stereoscopic imaging with high brightness and optical efficiency, providing a seamless viewing experience by ensuring that each eye receives the appropriate image without flicker or brightness reduction, thus overcoming the limitations of traditional systems.
Implementation Method 1
passing the modulated first and second light beams through a pair of passive glasses with built-in first and second interference filters for viewing such that the modulated first light beam is passed substantially only through the first interference filter; and such that the modulated second light beam is passed substantially only through the second interference filter
Data Source
AI summary
A stereoscopic display system employs narrowband illumination light beams and passive glasses with built-in interference filters. The system is also compatible with multiple viewing functions.