Polarization Rotation Device for Uniform 3D Projection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current projection devices experience inconsistent polarization and brightness in stereo images due to optical elements inside the device, leading to uneven color and brightness in projected frames.

Innovation Solution

A polarization rotation device with a rotation shaft, driving element, polarization element, and reflective element is integrated into the projection system, allowing the excitation light beam to pass through the polarization element and be reflected, resulting in different polarization states at different times, ensuring uniform color and brightness in stereoscopic displays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If optical elements are used inside the projection device, then the projection device can function properly, but the polarization polarity of the excitation light beam is destroyed, resulting in inconsistent polarization directions and intensities

Engineering Contradiction:

Improveprojection device functionVSAvoidpolarization polarity destruction

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A polarization rotation device is introduced as an intermediary component between the excitation light source and the projection optics. This device actively compensates for polarization disturbances caused by internal optical elements, maintaining consistent polarization states throughout the system.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The polarization rotation device dynamically adjusts the polarization angle parameter of the light beam to compensate for rotations and distortions introduced by internal optical elements, ensuring stable polarization characteristics at the output.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If a polarizer is added outside the lens for stereo image generation, then polarization stereo mode is achieved, but the projected images show uneven color and brightness

Engineering Contradiction:

Improvepolarization stereo mode capabilityVSAvoidbrightness uniformity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The polarization rotation device performs preliminary adjustment of the excitation light beam's polarization state before it enters the projection system. By pre-compensating for expected polarization changes, the system ensures uniform color and brightness in the final stereoscopic projection without requiring post-correction.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the excitation light beam passes through optical elements, then the projection device can process the light, but the polarization directions and intensities become inconsistent

Engineering Contradiction:

Improvelight processing capabilityVSAvoidpolarization consistency

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The system incorporates feedback mechanisms that monitor the polarization state of light throughout the projection path. Based on detected variations, the polarization rotation device automatically adjusts compensation parameters to maintain consistent polarization characteristics despite light processing operations.

Inventive Principle:

Principle #23Feedback

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 the projection device to produce 3D displays with uniform color and brightness, enhancing the stereoscopic viewing experience through polarization stereoscopic glasses by maintaining consistent polarization and intensity of the projected images.

Implementation Method 1

The polarization element is connected to the rotation shaft and disposed on a transmission path of the at least one excitation light beam. When the polarization element rotates, the at least one excitation light beam is transmitted to the polarization element and passes through the polarization element

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

the at least one excitation light beam is transmitted to the polarization element and passes through the polarization element and is again transmitted to and passes through the polarization element by reflection of the reflective element

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS10969673B2Polarization rotation device and projection device

Publication Date: 2021.04.06 CORETRONIC CORPORATION

AI summary

A polarization rotation device including a rotation shaft, a driving element, a polarization element and a reflective element is provided. The polarization element is disposed on a transmission path of the at least one excitation light beam. The reflective element is disposed on a side of the polarization element. The driving element drives the polarization element to sequentially rotate with the rotation shaft as a rotation center axis. When the polarization element rotates, the excitation light beam is transmitted to the polarization element and passes through the polarization element and is again transmitted to and passes through the polarization element by the reflective element. The excitation light beam outputting from the polarization rotation device has different polarization states at different time periods. A projection device applying the polarization rotation device of the invention achieves the effect of uniform color or brightness when displaying images in a 3D display mode.