Wire Grid Polarizer Modulator for Stereoscopic Projection
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Solution Overview
Problem
Stereoscopic motion picture projection systems using sheet polarizers face issues with bulkiness, weight, and degradation due to heat absorption, requiring cooling fans and resulting in reduced transmission and contrast ratios, as well as complexity in mounting due to varying projector form factors.
Innovation Solution
A polarization modulator using a wire grid polarizer (WGP) in combination with pi-cells and a cleanup polarizer, mounted proximate to the projector lens, allowing for improved airflow and reduced size, eliminating the need for cooling fans and enabling direct lens mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet polarizer is used in ZScreen modulator, then polarization function is achieved, but heat absorption increases causing device degradation and requiring cooling fan
Solution Approach 1:
The patent changes the fundamental operating parameter of the polarizer from absorption-based (sheet polarizer with dye) to reflection-based (wire grid polarizer with metallic wires). This parameter change allows the polarizer to reflect one polarization state while transmitting the other, dramatically reducing heat absorption and eliminating the need for cooling fans while maintaining reliable polarization function
Solution Approach 2:
The patent replaces the chemical/dye-based sheet polarizer mechanism with a physical wire grid structure. The wire grid uses the physical interaction of light with conductive wires to achieve polarization through reflection rather than absorption, substituting a mechanical/physical system for a chemical one that degrades under heat
2Reliability
If sheet polarizer with high contrast ratio is used, then polarization contrast is improved, but light transmission decreases to approximately 40%
Solution Approach 1:
The patent changes the polarization mechanism from absorption to reflection. The wire grid polarizer reflects one polarization state while transmitting the other with minimal loss, achieving high contrast ratio through differential reflection/transmission rather than absorption. This parameter change enables transmission well above 40% while maintaining the required contrast ratio for stereoscopic projection
3Volume of moving object
If ZScreen modulator is mounted close to projector lens, then device size is reduced, but heat dissipation becomes difficult
Solution Approach 1:
The patent changes the thermal parameter of the polarizer by switching from absorption-based to reflection-based polarization. Since the wire grid polarizer does not absorb and convert light energy to heat, the thermal load is dramatically reduced. This allows the modulator to be mounted close to the projector lens without heat dissipation problems, enabling compact integration while maintaining safe operating temperatures
4Temperature
If cooling fan is added to ZScreen modulator, then heat dissipation is improved, but device complexity and weight increase
Solution Approach 1:
The patent extracts and removes the cooling fan and associated cooling system from the ZScreen modulator. By changing to a wire grid polarizer that inherently dissipates minimal heat, the patent eliminates the need for active cooling components, thereby reducing device complexity, weight, and mechanical failures while maintaining effective heat management
Solution Approach 2:
The wire grid polarizer is inherently self-cooling because it reflects rather than absorbs light energy. The device does not generate significant heat that requires external cooling systems, allowing it to operate passively without fans or active thermal management, thus achieving self-service thermal management
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 WGP-based modulator enhances transmission and contrast ratios, maintains polarization efficiency over time, reduces size and weight, simplifies installation, and provides improved cooling without fan dependency, resulting in a more robust and efficient stereoscopic image projection system.
Implementation Method 1
A polarization modulator using a wire grid polarizer (WGP) in combination with pi-cells and a cleanup polarizer
Implementation Method 2
The wire grid polarizer (WGP) in combination with pi-cells and a cleanup polarizer, mounted proximate to the projector lens
Implementation Method 3
at least one pi-cell or pi-cell electro-optical modulator in combination with a wire grid polarizer
Data Source
AI summary
A projection design configured for use with a projector having a projector lens is provided. The device includes at least one pi-cell or pi-cell electro-optical modulator in combination with a wire grid polarizer mounted proximate the pi-cell(s). The design may include a cleanup polarizer between the pi-cell(s) and the wire grid polarizer and optionally a protective window between the wire grid projector and projection lens. The device may be oriented at an angle substantially differing from the axis of the projector lens. The resultant device includes spacing for airflow and can offer improved performance, particularly in heating, over designs previously available.