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Polarization conversion system and method for stereoscopic projection

A polarization conversion and polarization technology, applied in the field of polarization conversion systems, can solve problems such as reducing brightness, unsatisfactory viewing experience, and limitations

Active Publication Date: 2010-03-31
REAID INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, however, this system design has the disadvantage that more than 50% of the light is absorbed by the polarizer, and the resulting image is typically more than 50% dimmer than conventional 2D cinema
In addition, time-sequential stereoscopic 3D reduces brightness by more than 50%
Dimmer images can thus limit the size of theaters for 3D applications and / or provide viewers with a less than ideal viewing experience

Method used

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  • Polarization conversion system and method for stereoscopic projection
  • Polarization conversion system and method for stereoscopic projection
  • Polarization conversion system and method for stereoscopic projection

Examples

Experimental program
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no. 1 approach

[0026] image 3 is a schematic diagram illustrating a first embodiment of a polarization conversion system (PCS) 300 . In general, PCS 300 may include an image source 304 (e.g., from a light modulating panel or conventional film), an initial relay lens 302, a polarizing beam splitter (PBS) 310, a first and Second relay lenses 306 and 308 , polarization switch 312 , folding mirror 318 , polarization conversion and switching module 320 , and first and second projection lenses 328 and 330 . Such as image 3 Illustrated in B, the polarization conversion and switching module 320 may include a polarization converter 322 and a polarization switch 324, and may optionally include a pre-polarizer 326 to improve contrast, all arranged as shown. Polarization converter 322 is an optical component (eg, a half-wave plate) operable to convert an input polarization state to an orthogonal polarization state.

[0027] The first and second relay lenses 306 and 308 are preferably symmetrical wi...

no. 2 approach

[0033] Figure 4 is a schematic diagram illustrating a second embodiment of a polarization conversion system (PCS) 400 . PCS 400 provides with image 3 The system shown in is similar to the relay system in that the arrangement of components has substantially similar structure and function, except that a glass prism 410 has been inserted into the second optical path 407, arranged as shown. The glass prism 410 may be a high refractive index glass prism.

[0034] In operation, glass prism 410 allows the two images 414 and 416 of panel 404 to be substantially juxtaposed in a single plane, providing for easier packaging and adjustment of projection lenses 428 and 430 . Preferably, relay system 400 is designed such that rays from a single field point of the object (ie, panel 404) produce collimated beams at aperture stops 401 and 403 (all rays from the field point have the same angle). This allows insertion of the glass prism 410 at the aperture stop without affecting the perform...

no. 3 approach

[0036] Figure 5 is a schematic diagram illustrating a third embodiment of a polarization conversion system (PCS) 500 . Figure 5 provide with Figure 4 Similar to the PCS 500 shown, except Figure 4 The polarization switch 412 has been replaced by a rotating wheel 550 operable to convert a polarized input into a set of time-alternating orthogonally polarized output states. In one embodiment, the rotating wheel 550 may contain segments that deliver alternating orthogonal polarizations from a non-polarized input. In another embodiment, the rotating wheel 550 may be preceded by a fixed polarizer. Rotating wheel 550 may then contain segments that characterize unitary polarization transformations, such as from a stack of retardation films.

[0037] One problem caused by the physical rotation of the polarizer (rotating wheel 550) is that the output varies in an analog fashion unless each segment is patterned to compensate for this effect. Functionally, a binary polarization sw...

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PUM

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Abstract

A polarization conversion system separates light from an unpolarized image source into a first state of polarization (SOP) and an orthogonal second SOP, and directs the polarized light on first and second light paths. The SOP of light on only one of the light paths is transformed to an orthogonal state such that both light paths have the same SOP. A polarization modulator temporally modulates thelight on the first and second light paths to first and second output states of polarization. First and second projection lenses direct light on the first and second light paths toward a projection screen to form substantially overlapping polarization encoded images. The polarization modulator may be located before or after the projection lenses. The polarization-encoded images may be viewed usingeyewear with appropriate polarization filters.

Description

[0001] background technical field [0001] Embodiments of the present disclosure relate generally to projection of polarization-encoded images, and, more particularly, to polarization conversion systems and methods for delivering polarization-encoded images to a projection screen. Background technique [0002] figure 1 is a schematic diagram illustrating an exemplary polarization preserving display system 100 . The display system 100 includes a projection screen 102 and polarizing filter glasses 104 . Stereoscopic three-dimensional (3D) images are viewed through polarizing filter glasses 104 using a single polarization maintaining screen 102 that sequentially displays left and right perspective images. Polarizing filter glasses 104 contain two lenses 106 and 108 of alternating orthogonal polarizations. [0003] 3D images can be synthesized using polarization-controlled encoding at the projector, and decoding the left and right perspective images using polarization-filtere...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B30/25G03B35/26
CPCG02B27/26H04N13/0434G02B13/00G02B26/008H04N13/0438H04N13/337H04N13/341G02B30/24G02B30/25H04N13/30G02B5/30G03B21/00G02B30/00
Inventor M·H·舒克M·G·鲁宾逊G·D·夏普
Owner REAID INC
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