Polarizer Patents (Class 353/8)
  • Patent number: 10969673
    Abstract: 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.
    Type: Grant
    Filed: November 5, 2019
    Date of Patent: April 6, 2021
    Assignee: Coretronic Corporation
    Inventors: Haw-Woei Pan, Yao-Shun Lin
  • Patent number: 10914965
    Abstract: A stereoscopic image apparatus that is capable of minimizing loss of optical energy and improving quality of a stereoscopic image is disclosed. The stereoscopic image apparatus includes a polarizing beam splitter to reflect or transmit incident light based on polarization components of the light to split the light in at least three different directions, a reflective member to reflect the light reflected by the polarizing beam splitter to a screen, at least one modulator to modulate the light reflected by the reflective member and the light transmitted through the polarizing beam splitter, and a refractive member disposed in an advancing direction of light to be incident upon the polarizing beam splitter to refract the light to be incident upon the polarizing beam splitter.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: February 9, 2021
    Assignee: RealD Inc.
    Inventors: Chui Woo Lee, Sung Ho Cho, Byung Gul Lim
  • Patent number: 10869023
    Abstract: A method includes capturing an image of a lenticular display, generating a lenticular distortion map of the lenticular display using the image, and compensating for a lenticular distortion of the lenticular display using the lenticular distortion map. The lenticular distortion map is a dual-component lenticular distortion map and the image is a fringe pattern. The method compensates for the lenticular distortion by adjusting a swizzle function based on the lenticular distortion map.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: December 15, 2020
    Assignee: Google LLC
    Inventor: John D. Perreault
  • Patent number: 10777695
    Abstract: A photoelectronic sensor or the like capable of improving operation stability is provided. The photoelectronic sensor includes a light projecting unit having a light projecting lens that converges light and a light projecting element that projects light toward a reflective plate via the light projecting lens, and a light receiving unit disposed alongside the light projecting unit and having a light receiving lens that concentrates reflected light from the reflective plate and a light receiving element that receives the reflected light via the light receiving lens. The light projecting element has a light emitting area located on a side closer to the light receiving element than an optical axis of the light projecting lens and emitting light, and a non-light emitting area located on a side farther from the light receiving element than the optical axis and not emitting light.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: September 15, 2020
    Assignee: OMRON Corporation
    Inventors: Motoki Tanaka, Tsuyoshi Miyata
  • Patent number: 10761253
    Abstract: An out-of-field rejection filter (OFRF) can be used in optical systems to reject stray light. Such optical systems can include cameras, projectors, star trackers, and virtual reality or augmented reality displays. The OFRF can include a converter to convert randomly polarized light to p-polarized light and an angular selectivity layer to select in-field p-polarized light and reject out-of-field p-polarized light. The converter and the angular selectivity layer are configured so as to filter out-of-field light while passing in-field light within a light bandwidth. The angular selectivity layer can be a multilayer film of interleaved materials having alternating permittivity and magnetic permeability properties.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: September 1, 2020
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventor: Kevin J. Romero
  • Patent number: 10488653
    Abstract: Devices, systems, and methods corresponding to addressing misalignment in display systems are provided. A method includes using a first microelectromechanical system (MEMS) mirror, directing a first signal from a first light source to an alignment tracking waveguide. The method further includes receiving by a first photosensor a first portion of the first signal via the alignment tracking waveguide and determining a first alignment indicator associated with the first portion of the first signal. The method further includes using a second MEMS mirror, directing a second signal from a second light source to the alignment tracking waveguide. The method further includes receiving by a second photosensor a second portion of the second signal via the alignment tracking waveguide and determining a second alignment indicator associated with the second portion of the second signal.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: November 26, 2019
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Richard A. Wall, Dmitry Reshidko, Joseph Lowney, Richard A. James, Steven J. Robbins
  • Patent number: 10448002
    Abstract: There is provided a system and method for providing privacy viewing of an output from a electronic display, including a first polarizer configured to polarize a display signal at a first polarization angle; a second polarizer configured to polarize a noise signal at a second polarization angle orthogonal to the first polarization angle; a combiner configured to combine the polarized display signal and the polarized noise signal, and a third polarizer configured to receive the output of the electronic display and polarize the combined polarized display and noise signal at the first polarization angle. The system includes first and second polarization rotators configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display and prior to being received by the third polarizer.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: October 15, 2019
    Assignee: International Business Machines Corporation
    Inventors: Feng Cao, Jianbin Tang, Yini Wang, Ziyuan Wang
  • Patent number: 10302957
    Abstract: In some embodiments, a polarizing beam splitter is provided. The beam splitter may comprise an optically transmissive spacer having first and second opposing faces, with a first polarizer on the first opposing face and a second polarizer on the second opposing face. The optically transmissive spacer may separate first and second triangular prisms of a cube-type beam splitter, with the first polarizer between the first triangular prism and the first opposing face of the spacer, and the second polarizer between the second triangular prism and the second opposing face of the spacer.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: May 28, 2019
    Assignee: Magic Leap, Inc.
    Inventor: Bradley Jay Sissom
  • Patent number: 10298904
    Abstract: The present invention provides the first practical stereoscopic 3-D television/computer solution for home consumers. Taking advantage of the way the human brain processes imagery, a new compression algorithm, utilizing a new concept called “shared pixel parts”, allows for the transmission, reception, and display of full HD stereoscopic 3-D video with no loss of resolution or frames to either eye, using a single conventional TV channel and any type of conventional display without alteration. Depending on the type of display used, viewers wear either passive polarized glasses, a new type of static colored filter glasses, or a new type of active colored filter glasses to view the same data signal showing virtually ghost-free full-color images with great depth, a wide angle of view, and a bright flickerless image which doesn't produce any discomfort even after extended viewing, and the signal is also compatible with current 3-D-ready TVs.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: May 21, 2019
    Inventor: Gene Dolgoff
  • Patent number: 10291906
    Abstract: The present invention relates to a stereoscopic image device and a method for providing a stereoscopic image and, more specifically, to a stereoscopic image device and a method capable of providing a stereoscopic image, which can provide high-quality stereoscopic image by using two projectors and devices related thereto.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: May 14, 2019
    Assignee: RealD Inc.
    Inventors: Byung Gul Lim, Sung Ho Cho, Chul Woo Lee
  • Patent number: 10271046
    Abstract: The prevent invention provides a lens focusing apparatus. The lens focusing apparatus comprises a lens holding module for clamping at least one lens to be tested, a chart display module and a focal length shortening module. The chart display module includes a frame assembly, a first chart display and a plurality of second chart displays disposed on the frame assembly. Each second chart display is inclined at a first predetermined angle relative to the first chart display. The focal length shortening module includes a first focal length shortening device and a plurality of second focal length shortening devices. The first focal length shortening device is disposed between the at least one lens and the first chart display, and each second focal length shortening device is disposed between the at least one lens and the corresponding second chart display.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: April 23, 2019
    Assignees: LITE-ON ELECTRONICS (GUANGZHOU) LIMITED, LITE-ON TECHNOLOGY CORPORATION
    Inventor: Wen-Liang Hsu
  • Patent number: 10197810
    Abstract: Provided are display apparatuses and electronic apparatuses that include the display apparatuses. The display apparatus may include an optical system that transfers a first image and a second image to an ocular organ of a user. The optical system may include at least two polarization-dependent lenses. Each of the two polarization-dependent lenses may have a focal length that varies based on a polarization state of incident light. The two polarization-dependent lenses may have optically different characteristics with respect to the first and second images. The display apparatus may further include at least one wave plate and/or at least one polarizer provided between the two polarization-dependent lenses or outside thereof.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: February 5, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Wontaek Seo, Geeyoung Sung, Hongseok Lee, Yuntae Kim, Juwon Seo
  • Patent number: 10151932
    Abstract: The present invention discloses a stereoscopic 3d projection system that is based on elliptical polarization, and more specifically a time-multiplexed stereoscopic 3d projection system that enables the viewer to observe stereoscopic 3d images on the surface of a polarization-preserving projection-screen via utilization of passive elliptically-polarized viewing-glasses. The disclosed invention provides a stereoscopic 3d projection system that is capable of operating at higher frame-rates and/or with higher optical light efficiency as compared to other prior-art technologies that are instead based on circular polarization.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: December 11, 2018
    Assignee: Volfoni R&D
    Inventor: Stephen Palmer
  • Patent number: 10045010
    Abstract: There is provided a system and method for providing privacy viewing of an output from a electronic display, including a first polarizer configured to polarize a display signal at a first polarization angle; a second polarizer configured to polarize a noise signal at a second polarization angle orthogonal to the first polarization angle; a combiner configured to combine the polarized display signal and the polarized noise signal, and a third polarizer configured to receive the output of the electronic display and polarize the combined polarized display and noise signal at the first polarization angle. The system includes first and second polarization rotators configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display and prior to being received by the third polarizer.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: August 7, 2018
    Assignee: International Business Machines Corporation
    Inventors: Feng Cao, Jianbin Tang, Yini Wang, Ziyuan Wang
  • Patent number: 9942538
    Abstract: A stereoscopic image display apparatus that is capable of being efficiently aligned using a remotely controlled alignment function and a method of displaying a stereoscopic image using the same are disclosed.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: April 10, 2018
    Assignee: RealD Inc.
    Inventors: Bong Jae So, Yong Kyu Kim, Young Suk Kim
  • Patent number: 9931248
    Abstract: A method and system are provided for enhancing vision. The method includes capturing a first image by a first camera. The method further includes capturing a second image by a second camera. The method also includes combining the first image and the second image to form a combined image. The method additionally includes projecting the combined image on at least one eye of a user by a wearable image projection device. The combined image represents a wide screen image having a field of view greater than any of the first image and the second image taken individually.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: April 3, 2018
    Assignee: International Business Machines Corporation
    Inventors: Judith H. Bank, Liam Harpur, Patrick J. O'Sullivan, Lin Sun
  • Patent number: 9921412
    Abstract: Shaped glasses have curved surface lenses and spectrally complementary filters disposed on the curved surface lenses configured to compensate for wavelength shifts occurring due to viewing angles and other sources. The spectrally complementary filters include guard bands to prevent crosstalk between spectrally complementary portions of a 3D image viewed through the shaped glasses. In one embodiment, the spectrally complementary filters are disposed on the curved lenses with increasing layer thickness towards edges of the lenses. The projected complementary images may also be pre-shifted to compensate for subsequent wavelength shifts occurring while viewing the images.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: March 20, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Martin J. Richards, Wilson Allen
  • Patent number: 9807379
    Abstract: A display system comprises a projector combined with a retro reflective screen and a viewer distance from the projector such that the observation angle is less than approximately 2-3 degrees. The brightness of the image on the screen for the proposed display system is increased by a factor of ˜100-500× as compared to traditional display systems with for an equivalent power/intensity light source.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: October 31, 2017
    Assignee: MIRRAVIZ, INC.
    Inventor: Michael Wang
  • Patent number: 9575336
    Abstract: There is provided a system and method for providing privacy viewing of an output from a electronic display, including a first polarizer configured to polarize a display signal at a first polarization angle; a second polarizer configured to polarize a noise signal at a second polarization angle orthogonal to the first polarization angle; a combiner configured to combine the polarized display signal and the polarized noise signal, and a third polarizer configured to receive the output of the electronic display and polarize the combined polarized display and noise signal at the first polarization angle. The system includes first and second polarization rotators configured to rotate the first and second polarization angles of the combined polarized display and noise signals prior to being output by the electronic display and prior to being received by the third polarizer.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: February 21, 2017
    Assignee: International Business Machines Corporation
    Inventors: Feng Cao, Jianbin Tang, Yini Wang, Ziyuan Wang
  • Patent number: 9563064
    Abstract: A display processing apparatus is configured to process linearly polarized light emitted out from a display device.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: February 7, 2017
    Assignee: BOE TECHNOPLOGY GROUP CO., LTD.
    Inventors: Yunfei Li, Ling Shi, Shiming Shi
  • Patent number: 9532037
    Abstract: The invention relates to the field of optoelectronics and display technology and can be used in high speed stereoscopic glasses when working with any type of 3D display, designed to operate with active stereo glasses with standard (60-160 Hz), high (hundreds of Hz) and ultrahigh (several kilohertz) frame rate. According to the invention in optical shutters of high-speed stereo glasses a layer of the helix-free ferroelectric liquid crystal (FLC) with optimized physical parameters is used. The technical result is an increase of the optical contrast of FLC shutters, reducing the amplitude of the control voltage.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: December 27, 2016
    Inventors: Igor Nikolaevich Kompanets, Aleksandr Lvovich Andreev, Vasiliy Aleksandrovich Ezhov, Aleksandr Georgievich Sobolev
  • Patent number: 9479765
    Abstract: An autostereoscopic projection device includes an illuminating module, a light modulator, an optical module, and a lens module. The illuminating module is for providing light beams having different deflection angles in sequence. The light modulator is for modulating the light beams into compound images in sequence. The optical module is for guiding the light beams provided by the illuminating module to the light modulator, and guiding the compound images to the lens module. The lens module includes a beam splitting prism group, a first spatial filter, a second spatial filter, and a lens. The optical module is disposed at the incident surface of the beam splitting prism group. The first and second spatial filters are disposed at the first and second relay surfaces of beam splitting prism group for filtering the compound images to first and second images in sequence. The second images are different from the first images.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: October 25, 2016
    Assignee: DELTA ELECTRONICS, INC.
    Inventor: June-Jei Huang
  • Patent number: 9459463
    Abstract: Disclosed embodiments include stereoscopic systems having at least one compensator operable to reduce the sensitivity of polarization control over incidence angle of image source optics and analyzer optics. In an exemplary embodiment, the disclosed compensator is operable to compensate polarization changes induced by optics at either or both the image source subsystem and the analyzer subsystem, in which the polarization changes would be operable to cause leakage at the analyzer subsystem if uncompensated. As such, the disclosed compensators and compensation techniques are operable to reduce leakage at the analyzer subsystem even if the disclosed compensator may be located at the analyzer subsystem.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: October 4, 2016
    Assignee: RealD Inc.
    Inventors: Gary D. Sharp, David A. Coleman, Jianmin Chen
  • Patent number: 9423602
    Abstract: A compression algorithm, utilizing a new concept called “shared pixel parts”, allows for transmitting, receiving, and displaying full HD stereoscopic 3-D video with no loss of resolution or frames to either eye, using a single conventional TV channel and any type of conventional display without alteration. Depending on the type of display, viewers wear either passive polarized glasses, a new type of static colored-filter glasses, or a new type of active colored-filter glasses to view the same data signal showing virtually ghost-free full-color images with great depth, a wide angle of view, and a bright flickerless image which doesn't produce any discomfort even after extended viewing. The signal is also compatible with current 3-D-ready TVs. The compression algorithm can also be used to transmit and display a 2-D image with double the resolution of the display being used for viewing, with no increase of required transmission bandwidth.
    Type: Grant
    Filed: January 3, 2011
    Date of Patent: August 23, 2016
    Inventor: Gene Dolgoff
  • Patent number: 9223142
    Abstract: Disclosed embodiments relate to a stereoscopic projection system and methods. An exemplary disclosed projection system includes an optical component disposed between the lenses of a lens arrangement. An exemplary lens arrangement includes a first power group, a second power group, and an aperture stop. In an embodiment, the optical component is disposed between the first power group and the aperture stop. In an exemplary embodiment, the optical component is proximate to the aperture stop. By disposing the optical component closer to or proximate to the aperture stop in the lens arrangement, various benefits may be realized, including improved contrast uniformity.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: December 29, 2015
    Assignee: RealD Inc.
    Inventors: Miller H. Schuck, III, Michael G. Robinson, Gary D. Sharp
  • Publication number: 20150109539
    Abstract: A stereo projection apparatus includes a polarized beam splitter assembly for splitting a projecting light beam into a transmitted light beam, a first reflective light beam and a second reflective light beam; a polarization state transforming assembly for adjusting the polarization state of the transmitted light beam or the polarization state of the first reflective light beam and second reflective beam; a light path direction adjustment assembly for adjusting a travel direction of the transmitted light beam or a travel direction of the first reflective light beam and the second reflective light beam; a light beam size adjustment assembly for adjusting a coverage range of the transmitted light beam or a coverage range of the first reflective light beam and the second reflective light beam; and a light modulator for modulating the adjusted transmitted light beam, first reflective light beam and second reflective light beam to left-circularly polarized light and right-circularly polarized light in accordance wi
    Type: Application
    Filed: December 23, 2014
    Publication date: April 23, 2015
    Inventors: Yanlong Li, Xianjun Deng, Yetong Wang
  • Patent number: 9013388
    Abstract: A liquid crystal display device (1) includes a liquid crystal panel having a plurality of pixels disposed in a matrix form, and a patterned retarder having retarder plates (RR) and retarder plates (RL) formed at positions corresponding to odd-numbered rows and even-numbered rows, respectively, of the liquid crystal panel. Among sub pixels disposed in the pixels positioned in the n-th row, a sub pixel electrode of a boundary-proximity sub pixel, which is positioned closest to a boundary between the associated retarder plate (RR) and the associated retarder plate (RL), is connected to an auxiliary bus line via a transistor having a gate electrode connected to a gate bus line in the (n?1)-th or prior row. In the second display mode, gate signals are sequentially supplied to the gate bus lines in order from the first to the N-th rows, and, in the first display mode, gate signals are sequentially supplied to the gate bus lines in order from the N-th to the first rows.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: April 21, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shohei Katsuta, Tsuyoshi Kamada, Seiji Ohhashi
  • Publication number: 20150103318
    Abstract: A stereoscopic image apparatus that is capable of minimizing loss of optical energy and improving quality of a stereoscopic image is disclosed. The stereoscopic image apparatus includes a polarizing beam splitter to reflect or transmit incident light based on polarization components of the light to split the light in at least three different directions, a reflective member to reflect the light reflected by the polarizing beam splitter to a screen, at least one modulator to modulate the light reflected by the reflective member and the light transmitted through the polarizing beam splitter, and a refractive member disposed in an advancing direction of light to be incident upon the polarizing beam splitter to refract the light to be incident upon the polarizing beam splitter.
    Type: Application
    Filed: March 26, 2014
    Publication date: April 16, 2015
    Applicant: MASTERIMAGE 3D Asia, LLC.
    Inventors: Chul Woo Lee, Sung Ho Cho, Byung Gul Lim
  • Patent number: 8998417
    Abstract: A polarization controller adapted to output respective projection lights for a right-eye image and a left-eye image that are incident from a projector to a screen in different polarization directions, includes: a liquid crystal device adapted to change the polarization directions of the projection lights; and a controller adapted to control the liquid crystal device so that the respective projection lights for the right-eye image and the left-eye image have different polarization directions, wherein the controller performs control for mirror-reversing the polarization directions of the projection lights in the liquid crystal device according to a control signal indicating whether the projector performs mirror reversal of the right-eye image and the left-eye image, input from the projector.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: April 7, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Hiroaki Yanai
  • Patent number: 8989535
    Abstract: In embodiments of a multiple waveguide imaging structure, an imaging structure includes a first waveguide for see-through viewing of an environment at a first field of view, and includes a second waveguide for see-through viewing of the environment at a second field of view. The first and second waveguides each include a polarizing beam splitter to reflect light that enters at a first polarization orientation angle in the respective first and second waveguides, and the polarizing beam splitters pass through the light that enters at a second polarization orientation angle. The imaging structure also includes a polarization switch to rotate the polarization of the light through the first and second polarization orientation angles.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: March 24, 2015
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Steven John Robbins
  • Publication number: 20150077713
    Abstract: Various embodiments relate to a method for projecting a 3D image onto a projection surface, which includes a first and a second partial images for a right and left eyes of a first viewer, respectively. A first illumination beam, which has electromagnetic radiation of a predetermined first property, is produced depending on first image data. A second illumination beam, which has electromagnetic radiation of a predetermined second property different from the first property, is produced depending on second image data. The first and the second illumination beam are deflected towards the projection surface such that the first and the second illumination beams produce a first and a second beam spots thereon, respectively. The first and the second beam spots are moved across the projection surface such that the first and the second partial images are shown with the aid of the first and the second beam spot, respectively.
    Type: Application
    Filed: February 15, 2012
    Publication date: March 19, 2015
    Applicant: OSRAM GmbH
    Inventor: Jan Oliver Drumm
  • Patent number: 8960912
    Abstract: A method is provided for projecting a three-dimensional image. The method includes providing a first light source that emits first eye images and a second light source that emits second eye images. A polarization of the first light source is orthogonal to a polarization of the second light source. A first eye image of a first color is projected from the first light source. A second eye image of the same first color is projected from the second light source. A first eye image of a second color is projected from the first light source. A second eye image of the same second color is projected from the second light source. A first eye image of a third color is projected from the first light source. A second eye image of a third color is projected from the second light source.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: February 24, 2015
    Assignee: International Business Machines Corporation
    Inventor: Casimer M. DeCusatis
  • Patent number: 8960911
    Abstract: A projector includes a lamp that emits projection light to project 3D picture, in which a right eye image and a left eye image are represented in a time division manner, to an object, a synchronization signal transmission section which transmits shutter synchronization signal to glasses having a right eye shutter and a left eye shutter to control the opened state or the closed state of the right eye shutter and the left eye shutter, based on the signal indicating a displaying period of the right eye image and the left eye image of 3D picture, and a lamp drive section that supplies AC current having peak overlapping with a period when the right eye shutter of the glasses is in the opened state and peak overlapping with a period when the left eye shutter of the glasses is in the opened state to the lamp, based on the signal.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: February 24, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Hirosada Horiguchi, Hiroshi Yoshimoto, Tadashi Yamada, Keiji Fukuhara
  • Patent number: 8955978
    Abstract: An external polarization conversion device used for a projector includes a first element which converts light from the projector to polarized light in a uniform polarization direction, and a second element which is arranged in a position subsequent to the first element in such a way that there is a space between the first element and the second element and which converts the polarized light from the first element to predetermined polarized light that is different from the polarized light from the first element.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: February 17, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Hiroaki Yanai
  • Patent number: 8955975
    Abstract: A method is provided that includes providing a light source having a light emitting diode (LED) that emits a light. A polarization conversion system (PCS) is located adjacent the LED and has both a linear polarizer and a wave plate. A polarizing beam splitter (PBS) is adjacent the light source and an imaging device is adjacent the PBS. The wave plate of the PCS is rotated to a first position, and a first light is emitted by the LED in the first light source. This first light is converted to circular polarization. This first light travels to the PBS where it is reflected onto the imaging device. The wave plate is then rotated to a second position, and a second light is emitted by the light source. This second light is converted to circular polarization and reflects from the PBS onto the imaging device.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 17, 2015
    Assignee: International Business Machines Corporation
    Inventor: Casimer M. DeCusatis
  • Patent number: 8944604
    Abstract: A method is provided for projecting a three-dimensional image. The system includes a first light source, the first light source emitting light in a first direction and a second light source emitting light in a second direction. A beam splitter device is disposed adjacent each light source and an imaging device is disposed adjacent the beam splitter device. Light from the first light source and the second light source travel a common optical path to a projector lens assembly.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 3, 2015
    Assignee: International Business Machines Corporation
    Inventor: Casimer M. DeCusatis
  • Publication number: 20150002819
    Abstract: A polarization conversion system (PCS) is located in the output light path of a projector. The PCS may include a polarizing beam splitter, a polarization rotating element, a reflecting element, and a polarization switch. Typically, a projector outputs randomly-polarized light. This light is input to the PCS, in which the PCS separates p-polarized light and s-polarized light at the polarizing beam splitter. P-polarized light is directed toward the polarization switch on a first path. The s-polarized light is passed on a second path through the polarization rotating element (e.g., a half-wave plate), thereby transforming it to p-polarized light. A reflecting element directs the transformed polarized light (now p-polarized) along the second path toward the polarization switch. The first and second light paths are ultimately directed toward a projection screen to collectively form a brighter screen image in cinematic applications utilizing polarized light for three-dimensional viewing.
    Type: Application
    Filed: September 12, 2014
    Publication date: January 1, 2015
    Inventors: Miller H. Schuck, Michael G. Robinson, Gary D. Sharp
  • Publication number: 20140375956
    Abstract: A projection device may include at least one first laser device and one second laser device, which is arranged opposite the first laser device. A prism is arranged between the two laser devices, wherein a polarization-dependent mirror device is arranged in the prism in such a manner that the beam of the first laser device is reflected in a direction that extends opposite the direction in which the beam of the second laser device is reflected. The polarization of the beam of the second laser device is then rotated, and the beam is deflected back to the polarization-dependent mirror device. The beam of the second laser device now passes through the mirror device without reflection due to the change in the polarization of the beam of the second laser device, such that two superposed laser beams of different polarization are available at the output of the projection device.
    Type: Application
    Filed: January 8, 2013
    Publication date: December 25, 2014
    Inventor: Sergey Khrushchev
  • Patent number: 8888290
    Abstract: A polarization beam splitter includes at least six prisms assembled together to form a single solid components. At least one diagonal interface is formed by a combination of two or more prism surfaces. The solid polarization beam splitter component has at least four light entrance/exit surfaces with at least one of the light entrance/exit surfaces including a step. At least one of the prisms has a non-triangular cross-sectional shape. At least one surface of a prism that forms a portion of the diagonal interface has a polarization beam splitting material disposed thereon resulting in a diagonal interface that includes a polarization beam splitting material. The polarization beam splitter can be incorporated into various image projection apparatus including 2D, multiple image, and 3D projection apparatuses.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: November 18, 2014
    Assignee: Hong Kong Applied Science and Technology Research Institute Company Limited
    Inventor: Ying Liu
  • Publication number: 20140320822
    Abstract: Polarizing beam splitters and systems incorporating such beam splitters are described. More specifically, polarizing beam splitters and systems with such beam splitters that incorporate multilayer optical films and reflect imaged light towards a viewer or viewing screen with high effective resolution are described.
    Type: Application
    Filed: November 14, 2012
    Publication date: October 30, 2014
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Joseph C. Carls, Seong Taek Lee, Yeow Leng Teo, Kin Sheng Chan, Xiaohui Cheng
  • Patent number: 8870381
    Abstract: An imaging system (300) configured to reduce perceived flicker in three-dimensional images is provided. The imaging system (300) can include a plurality of light sources (305,306,307), a light combiner (302), a light modulator (303) and a polarization rotator (301). The light combiner (302) combines light received from each of the light sources into a combined beam (304). A first light portion (313) in the combined beam has a first light portion polarization state that is different from a second light portion polarization state of a second light portion (314). The light modulator (303) produces images by modulating the combined beam (304) along a projection surface (316). The polarization rotator (301) selectively rotates a polarization state of the combined beam (304) in synchrony with an image refresh cycle of the imaging system. A circular polarizer (1004) can be used to transform linear polarization states to circular polarization states.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: October 28, 2014
    Assignee: Microvision, Inc.
    Inventors: Mark O. Freeman, P. Selvan Viswanathan, David Lashmet
  • Patent number: 8864313
    Abstract: A display apparatus (10) has at least one color channel providing a modulated light for each of a plurality of image frames (92). One or more laser sources that provide an illumination beam having a first polarization transmission axis. An imaging modulator (854, 85g, 85b) in the path of the illumination beam is actuable to direct the modulated light toward a projection lens. A laser blanking apparatus in the path of the modulated light is disposed to block transient light between image frames and has at least one analyzer (66) having a second polarization transmission axis that is orthogonal to the first polarization transmission axis and at least one light polarization modulator that is synchronously timed to rotate polarization of transient light during an interval between frames.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: October 21, 2014
    Assignee: Eastman Kodak Company
    Inventors: Michael A. Marcus, Marek W. Kowarz, James G. Phalen, John A. Agostinelli
  • Patent number: 8851680
    Abstract: Disclosed embodiments include stereoscopic systems having at least one compensator operable to reduce the sensitivity of polarization control over incidence angle of image source optics and analyzer optics. In an exemplary embodiment, the disclosed compensator is operable to compensate polarization changes induced by optics at either or both the image source subsystem and the analyzer subsystem, in which the polarization changes would be operable to cause leakage at the analyzer subsystem if uncompensated. As such, the disclosed compensators and compensation techniques are operable to reduce leakage at the analyzer subsystem even if the disclosed compensator may be located at the analyzer subsystem.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: October 7, 2014
    Assignee: RealD Inc.
    Inventors: Gary D. Sharp, David A. Coleman, Jianmin Chen
  • Patent number: 8833943
    Abstract: A polarization conversion system (PCS) is located in the output light path of a projector. The PCS may include a polarizing beam splitter, a polarization rotating element, a reflecting element, and a polarization switch. Typically, a projector outputs randomly-polarized light. This light is input to the PCS, in which the PCS separates p-polarized light and s-polarized light at the polarizing beam splitter. P-polarized light is directed toward the polarization switch on a first path. The s-polarized light is passed on a second path through the polarization rotating element (e.g., a half-wave plate), thereby transforming it to p-polarized light. A reflecting element directs the transformed polarized light (now p-polarized) along the second path toward the polarization switch. The first and second light paths are ultimately directed toward a projection screen to collectively form a brighter screen image in cinematic applications utilizing polarized light for three-dimensional viewing.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: September 16, 2014
    Assignee: RealD Inc.
    Inventors: Miller H. Schuck, Michael G. Robinson, Gary D. Sharp
  • Publication number: 20140253879
    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 the light 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 using eyewear with appropriate polarization filters.
    Type: Application
    Filed: May 19, 2014
    Publication date: September 11, 2014
    Applicant: RealD Inc.
    Inventors: Miller H. Schuck, Michael G. Robinson, Gary D. Sharp
  • Publication number: 20140247428
    Abstract: Projection 3D systems and polarization preserving 3D screens are described that substantially increase polarization contrast ratio and viewing angle.
    Type: Application
    Filed: October 25, 2012
    Publication date: September 4, 2014
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Richard Y. Liu, Alan P. Miller
  • Patent number: 8820936
    Abstract: An electronic device having a 3-D image projection mechanism is provided. The electronic device comprises a display panel, a processing module, a projection screen and at least two micro projectors. The display panel is formed on a main body of the electronic device to display a 2-D display frame. The processing module determines whether a 3-D display request is received and generates a 3-D display command when the 3-D display request is received. The projection screen is formed according to the 3-D display command and is substantially vertical to the display panel, in which a light refractive rate of the projection screen is different from that of the air around the projection screen. The micro projectors are disposed in a circumference of the display panel and project image on the projection screen according to the 3-D display command such that a 3-D display frame is formed thereon.
    Type: Grant
    Filed: October 3, 2012
    Date of Patent: September 2, 2014
    Assignee: HTC Corporation
    Inventor: Chia-Han Chen
  • Patent number: 8820937
    Abstract: An optical polarization state modulator assembly for use in a stereoscopic three-dimensional image projection system includes a spatial light modulator, a light source emitting multiple wavelength components of light for incidence on the spatial light modulator, and a projection lens. A polarization converter system cooperates with the spatial light modulator to produce in alternating sequence polarized light carrying first and second perspective view images of a scene in different ones of first and second subframes. A polarization modulator, in response to first and second drive signals, imparts to, respectively, the image-carrying polarized light a first output polarization state during the first subframe and to the image-carrying polarized light a second output polarization state during the second subframe. The image-carrying polarized light in the first and second output polarization states propagates through the projection lens for transmission to an observer.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: September 2, 2014
    Assignee: LC-TEC Displays AB
    Inventors: Jesper Osterman, Terry J. Scheffer
  • Patent number: 8814367
    Abstract: A 3D image cinema system having at least one projection room for viewing 3D images or 2D images is divided into forward and rearward viewing directions for the projection of an image on a front screen and a rear screen which are provided in a front end and a rear end of the projection room, respectively. Further, a front direction chair and a rear direction chair having a different viewing direction are provided on a front step and a rear step between the projection room and the front and rear screens where the theater can be easily installed in a general building and the 3D and 2D image has as much as 1.5-2 times wider viewing as a prior image.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: August 26, 2014
    Inventor: Hae-Yong Choi
  • Patent number: 8807755
    Abstract: The polarization beam splitting element is configured to reflect or transmit an entering beam according to its polarization direction. The element includes, in order from a beam entrance side, a base member having a light transmissive property, a first one-dimensional grating structure formed of a dielectric material and having, in a first direction, a first grating period smaller than a wavelength of the entering beam, and a second one-dimensional grating structure formed of a metal and having, in a second direction orthogonal to the first direction, a second grating period smaller than the wavelength of the entering beam.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: August 19, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Rie Ishimatsu