Stereo Projection Screen Polarization Control
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Solution Overview
Problem
Current stereo projection technologies require synchronization of image signals for left and right eyes, leading to crosstalk issues and inconvenience, especially with passive polarized glasses needing external modulators.
Innovation Solution
A stereo projection system incorporating a polarized projector, a stereo projection screen with a scattering screen, phase retardation layer, and metal reflection layer, and polarizing glasses, where the polarization state of image light beams is manipulated to avoid synchronization needs, allowing for independent passage through lenses, thereby eliminating crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If passive polarized glasses technology is used, then no synchronization signal is needed, but external polarizing modulators are required causing inconvenience
Solution Approach 1:
The patent combines the polarizing modulator function directly into the projector device, merging two separate components (projector and external polarizing modulator) into one integrated unit. This eliminates the need for external modulators while maintaining the passive polarized glasses technology benefits.
Solution Approach 2:
The projector is designed to perform multiple functions: it acts as both the image projection device and the polarizing modulator. The projector can dynamically adjust polarization states of projected images without requiring separate external equipment, achieving multi-functionality.
2Reliability
If synchronization signal is used, then stereo vision can be achieved, but crosstalk occurs on images affecting viewing experience
Solution Approach 1:
The system uses dynamic polarization modulation where the projector can rapidly switch between different polarization states (horizontal and vertical) in sync with the projected frames. This dynamic adjustment allows the passive polarized glasses to correctly direct left and right eye images without crosstalk, achieving reliable stereo vision.
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
Enhances stereo viewing experience by eliminating signal crosstalk and increasing operational convenience by not requiring external polarizing modulators for dynamic polarization adjustments.
Implementation Method 1
The phase retardation layer is disposed between the scattering structure layer and the polarized projector. The first image light beam has a second polarization state after being transmitted to the first display area and leaving the stereo image screen. The second polarization state is orthogonal to the first polarization state.
Implementation Method 2
The metal reflection layer covers at least a part of the scattering structure layer and is adapted to reflect the first image light beam from the phase retardation layer back to the phase retardation layer.
Implementation Method 3
The scattering screen has a scattering structure layer on a side of the scattering screen facing the polarized projector.
Implementation Method 4
One of the left-eye lens and the right-eye lens is adapted to allow the first image light beam having the second polarization state to pass through and absorb the second image light beam having the first polarization state. The other of the left-eye lens and the right-eye lens is adapted to allow the second image light beam having the first polarization state to pass through and absorb the first image light beam having the second polarization state.
Data Source
AI summary
A stereo projection screen including a scattering screen having a scattering structure layer, a phase retardation layer disposed between the scattering structure layer and the polarized projector, and a metal reflection layer covering at least a part of the scattering structure layer is provided. The scattering structure layer and the phase retardation layer are arranged in a first display area and a second display area of the stereo projection screen. The metal reflection layer is arranged in at least one of the first display area and the second display area. A first image light beam having a first polarization state has a second polarization state after being transmitted to the first display area and leaving the stereo projection screen. A second image light beam having the first polarization state still has the first polarization state after being transmitted to the second display area and leaving the stereo projection screen.