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公开(公告)号：US10151932B1
公开(公告)日：2018-12-11
申请号：US15795878
申请日：2017-10-27
Applicant: Volfoni R&D
Inventor： Stephen Palmer
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.
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2.发明申请STEREOSCOPIC 3D PROJECTION SYSTEM WITH IMPROVED LEVEL OF OPTICAL LIGHT EFFICIENCY 有权具有提高光学效率水平的立体三维投影系统公开(公告)号：US20160381352A1
公开(公告)日：2016-12-29
申请号：US14750227
申请日：2015-06-25
Applicant: Volfoni R&D EURL
Inventor： Stephen Palmer
CPC classification number: G02B27/26 , G02B5/3041 , G02B5/3083 , G02B27/2264 , G02B27/283 , G02F1/13363 , G03B21/56 , H04N13/337 , H04N13/341 , H04N13/363
Abstract: A time-multiplexed stereoscopic 3d projection system including a beam-splitting element to split the randomly polarized image-beam generated by a single-lens projector into one primary image-beam, possessing a first state of linear polarization, and two secondary image-beams, both possessing a second state of linear polarization. The polarization states are mutually orthogonal. The primary and secondary image-beams recombine to form a complete image on the surface of a polarization-preserving projection-screen. There are polarization modulators that modulate the first and second states of linear polarization between a left and right circular polarization state. There is a contrast enhancement film in the optical-path of the primary or secondary image-beams located between the polarization modulator and the projection-screen. The contrast enhancement film comprises a stack of at least three uniaxially stretched retardation-films which perturb the circular polarization state of said image-beams and which possess an in-plane retardation value substantially equal to 140 nm, 270 nm, or 540 nm.
Abstract translation: 一种时分复用立体3D投影系统，包括分束元件，将由单透镜投影仪产生的随机偏振图像光束分解为具有第一状态的线性偏振的一个主图像束，以及两个次级图像束 都具有第二种线性极化状态。 极化状态是相互正交的。 初级和次级图像光束重新组合以在偏振保留投影屏幕的表面上形成完整的图像。 存在调制左和右圆极化状态之间的线性极化的第一和第二状态的偏振调制器。 位于偏振调制器和投影屏之间的主要或次要图像光束的光路中存在对比度增强膜。 对比度增强膜包括至少三个单轴拉伸延迟膜的堆叠，其扰乱所述图像束的圆偏振状态并且具有基本上等于140nm，270nm或540nm的面内延迟值。
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公开(公告)号：US11531212B2
公开(公告)日：2022-12-20
申请号：US17100131
申请日：2020-11-20
Applicant: Volfoni R&D , Shenzhen Timewaying Technology Co., Ltd
Inventor： Stephen Palmer , Bertrand Caillaud , YanLong Li
IPC: G02B30/25 , G02B30/24 , G02B27/28 , G02C7/12 , G02F1/13363 , G02F1/1337 , G02F1/139
Abstract: Stereoscopic 3D systems include a conversion system having a polarization beam-splitting element to separate a randomly polarized incident image-beam into one transmitted image-beam and at least one reflected image-beam, first and second polarization modulators arranged to modulate states of the transmitted and reflected image-beams between first and second output linear polarization states, the modulators including first and second pi-cell liquid crystal elements aligned in mutually crossed orientation and switched between first and second optical-states, one of the optical-states having in-plane optical retardation corresponding to a quarter-wave plate (QWP), an additional QWP proximate to one of the pi-cell liquid crystal elements and perpendicularly aligned to the optical axis for the in-plane optical retardation for one of the pi-cell liquid crystal elements. Passive linear polarized viewing-glasses include first and second lenses, each having a mutually parallel linear polarizer, and a half-wave plate located proximate the input surface for one of the lenses.
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公开(公告)号：US20210157163A1
公开(公告)日：2021-05-27
申请号：US17100131
申请日：2020-11-20
Applicant: Volfoni R&D , Shenzhen Timewaying Technology Co., Ltd
Inventor： Stephen Palmer , Bertrand Caillaud , YanLong Li
IPC: G02B30/25 , G02B27/28 , G02F1/1337 , G02F1/13363 , G02C7/12 , G02F1/139 , G02B30/24
Abstract: Stereoscopic 3D systems include a conversion system having a polarization beam-splitting element to separate a randomly polarized incident image-beam into one transmitted image-beam and at least one reflected image-beam, first and second polarization modulators arranged to modulate states of the transmitted and reflected image-beams between first and second output linear polarization states, the modulators including first and second pi-cell liquid crystal elements aligned in mutually crossed orientation and switched between first and second optical-states, one of the optical-states having in-plane optical retardation corresponding to a quarter-wave plate (QWP), an additional QWP proximate to one of the pi-cell liquid crystal elements and perpendicularly aligned to the optical axis for the in-plane optical retardation for one of the pi-cell liquid crystal elements. Passive linear polarized viewing-glasses include first and second lenses, each having a mutually parallel linear polarizer, and a half-wave plate located proximate the input surface for one of the lenses.
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公开(公告)号：US20190107729A1
公开(公告)日：2019-04-11
申请号：US16150594
申请日：2018-10-03
Applicant: VOLFONI R&D
Inventor： Stephen PALMER
CPC classification number: G02B27/26 , G02B13/02 , G02B27/2264 , G02B27/283 , G03B21/28 , G03B35/26 , H04N9/3167 , H04N9/317 , H04N13/337 , H04N13/341 , H04N13/363
Abstract: The present invention relates to a time-multiplexed stereoscopic 3d projection system wherein the image-beam from a digital cinema projector is separated by a polarization beam-splitting element into one primary image-beam possessing a first state of polarization and at least one secondary image-beam possessing a second state of polarization. Polarization modulators are provided in order to modulate the polarization state for each of said primary and secondary image-beams thereof and arranged so that all left-eye images possess a first modulated state of polarization and all right-eye images possess a second modulated state of polarization. Additionally, there is provided one uniaxial condensing lens and at least one uniaxial expanding lens in order to minimize the optical path-lengths for each of said primary and secondary image-beams thereof, hence enabling said stereoscopic 3d projection system according to the present invention to operate together with projectors having a shorter throw-ratio as compared to other prior-art technologies.
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Patent Agency Ranking
公开(公告)号：US20190098289A1
公开(公告)日：2019-03-28
申请号：US16137891
申请日：2018-09-21
Applicant: VOLFONI R&D
Inventor： Stephen Palmer
IPC: H04N13/341 , H04N13/398 , G02C7/10 , G02B27/22 , G02B27/26 , G02F1/1335 , G02F1/139
Abstract: The present invention discloses the design of active 3d shutter-glasses for the viewing of time-multiplexed stereoscopic three dimensional (3d) images that offer both an improved level of on-screen image-brightness as well as reduced manufacturing costs as compared to other prior-art technologies. The disclosed invention is based on the insight that a tangential in-plane electrical-field can be utilized in order to provide for a voltage-assisted relaxation switching step together with cholesteric liquid crystal materials, thereby increasing the relaxation speed of said cholesteric liquid crystal materials thereof. Furthermore, dichroic-dye materials can additionally be added to said cholesteric liquid crystal materials in order to absorb at least some of the scattered light and hence reduce the overall level of perceived on-screen image-haze.
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公开(公告)号：US09740017B2
公开(公告)日：2017-08-22
申请号：US14894393
申请日：2014-05-27
Applicant: VOLFONI R&D
Inventor： Minh Hoang , Christophe Brossier , Bertrand Caillaud , Simon-Pierre Delord
IPC: G02B27/26 , G02B13/02 , G02B13/16 , G02B26/08 , G02B27/22 , G02B27/28 , G02F1/01 , G03B21/16 , G03B21/28 , G03B35/26 , H04N13/04
CPC classification number: G02B27/26 , G02B13/02 , G02B13/16 , G02B26/0825 , G02B27/2264 , G02B27/283 , G02F1/0136 , G03B21/16 , G03B21/28 , G03B35/26 , H04N13/341 , H04N13/363
Abstract: An optical polarization device for a stereoscopic image projector, including: a polarizer optical element including two beam splitter-polarizer plates, joined to one another; first and second optical reflectors configured to modify, respectively, a trajectory of first and second light beams reflected such that the reflected and transmitted light beams are projected to form one and same stereoscopic image; first, second, and third polarization modulators configured to selectively switch the optical polarization, respectively, of a transmitted light beam, of the first and of the second reflected light beams, between the first and second states of optical polarization; and a control circuit for the polarization modulators.
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8.发明授权Stereoscopic 3D projection system with improved level of optical light efficiency 有权立体3D投影系统具有提高的光学效率水平公开(公告)号：US09594255B2
公开(公告)日：2017-03-14
申请号：US14750227
申请日：2015-06-25
Applicant: Volfoni R&D EURL
Inventor： Stephen Palmer
CPC classification number: G02B27/26 , G02B5/3041 , G02B5/3083 , G02B27/2264 , G02B27/283 , G02F1/13363 , G03B21/56 , H04N13/337 , H04N13/341 , H04N13/363
Abstract: A time-multiplexed stereoscopic 3d projection system including a beam-splitting element to split the randomly polarized image-beam generated by a single-lens projector into one primary image-beam, possessing a first state of linear polarization, and two secondary image-beams, both possessing a second state of linear polarization. The polarization states are mutually orthogonal. The primary and secondary image-beams recombine to form a complete image on the surface of a polarization-preserving projection-screen. There are polarization modulators that modulate the first and second states of linear polarization between a left and right circular polarization state. There is a contrast enhancement film in the optical-path of the primary or secondary image-beams located between the polarization modulator and the projection-screen. The contrast enhancement film comprises a stack of at least three uniaxially stretched retardation-films which perturb the circular polarization state of said image-beams and which possess an in-plane retardation value substantially equal to 140 nm, 270 nm, or 540 nm.
Abstract translation: 一种时分复用立体3D投影系统，包括分束元件，将由单透镜投影仪产生的随机偏振图像光束分解为具有第一状态的线性偏振的一个主图像束，以及两个次级图像束 都具有第二种线性极化状态。 极化状态是相互正交的。 初级和次级图像光束重新组合以在偏振保留投影屏幕的表面上形成完整的图像。 存在调制左和右圆极化状态之间的线性极化的第一和第二状态的偏振调制器。 位于偏振调制器和投影屏之间的主要或次要图像光束的光路中存在对比度增强膜。 对比度增强膜包括至少三个单轴拉伸延迟膜的堆叠，其扰乱所述图像束的圆偏振状态并且具有基本上等于140nm，270nm或540nm的面内延迟值。
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公开(公告)号：US20160124238A1
公开(公告)日：2016-05-05
申请号：US14894393
申请日：2014-05-27
Applicant: VOLFONI R&D
Inventor： Minh HOANG , Christophe BROSSIER , Bertrand CAILLAUD , Simon-Pierre DELORD
IPC: G02B27/26 , G03B35/26 , G02B27/28 , G02B27/22 , G02B13/16 , G02B26/08 , G03B21/28 , G03B21/16 , G02F1/01 , G02B13/02
CPC classification number: G02B27/26 , G02B13/02 , G02B13/16 , G02B26/0825 , G02B27/2264 , G02B27/283 , G02F1/0136 , G03B21/16 , G03B21/28 , G03B35/26 , H04N13/341 , H04N13/363
Abstract: An optical polarization device for a stereoscopic image projector, including: a polarizer optical element including two beam splitter-polarizer plates, joined to one another; first and second optical reflectors configured to modify, respectively, a trajectory of first and second light beams reflected such that the reflected and transmitted light beams are projected to form one and same stereoscopic image; first, second, and third polarization modulators configured to selectively switch the optical polarization, respectively, of a transmitted light beam, of the first and of the second reflected light beams, between the first and second states of optical polarization; and a control circuit for the polarization modulators.
Abstract translation: 一种用于立体图像投影仪的光偏振装置，包括：包括两个彼此结合的分光偏振器板的偏振器光学元件; 第一和第二光学反射器被配置为分别修改反射的第一和第二光束的轨迹，使得反射和透射的光束被投射以形成一个和相同的立体图像; 第一，第二和第三偏振调制器被配置为分别在第一和第二反射光束状态之间选择性地切换第一和第二反射光束的透射光束的光学偏振; 以及用于偏振调制器的控制电路。
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公开(公告)号：US20200089016A1
公开(公告)日：2020-03-19
申请号：US16574903
申请日：2019-09-18
Applicant: VOLFONI R&D
Inventor： Stephen PALMER
Abstract: The present invention relates to a time-multiplexed stereoscopic 3d projection system that provides a higher level of on-screen image-brightness and image quality as compared to other prior-art technologies based on a single-beam architecture. The invention is based on the insight that a polarization beam-splitting element can be arranged to split an incident image-beam generated by a projector into one transmitted image-beam and at least one reflected image-beam, wherein each of said transmitted and reflected image-beams possess the same common state of polarization. Furthermore, by utilization of at least one reflecting surface, polarization rotator, polarization modulator, polarization-preserving projection-screen and passive polarized viewing-glasses, a stereoscopic 3d projection system is disclosed that provides for a high level of on-screen image-brightness and image quality.
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