Patents by Inventor Jiuzhi Xue
Jiuzhi Xue has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8085369Abstract: Self-compensating, quasi-homeotropic liquid crystal devices overcome the contrast reducing effects of smaller pretilt angles. The devices exhibit extremely high contrast ratio but at the same time suppress fringe field-induced disclination lines in high pixel density and small pixel size quasi-homeotropic displays. The surface pretilt and cell twist angles are set at values that, in combination, contribute to establishing a cuspate singularity in the contrast ratio for normally incident light in response to a drive signal switching the liquid crystal device to the OFF director field state that provides nearly 0% optical efficiency. The OFF director field state corresponds to a subthreshold drive level that provides for the liquid crystal device self-compensation for in-plane optical retardation.Type: GrantFiled: June 20, 2011Date of Patent: December 27, 2011Assignee: Cuspate, LLCInventors: Terry J. Scheffer, Jiuzhi Xue
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Publication number: 20110249226Abstract: Self-compensating, quasi-homeotropic liquid crystal devices overcome the contrast reducing effects of smaller pretilt angles. The devices exhibit extremely high contrast ratio but at the same time suppress fringe field-induced disclination lines in high pixel density and small pixel size quasi-homeotropic displays. The surface pretilt and cell twist angles are set at values that, in combination, contribute to establishing a cuspate singularity in the contrast ratio for normally incident light in response to a drive signal switching the liquid crystal device to the OFF director field state that provides nearly 0% optical efficiency. The OFF director field state corresponds to a subthreshold drive level that provides for the liquid crystal device self-compensation for in-plane optical retardation.Type: ApplicationFiled: June 20, 2011Publication date: October 13, 2011Applicant: Cuspate, LLCInventors: Terry J. Scheffer, Jiuzhi Xue
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Patent number: 7990600Abstract: An optically addressed, photoconductive spatial light modulator (SLM) operates in a transmissive mode and is capable of modulating a wide spectrum of visible light. There is no pixel structure or native pixel resolution in the SLM. The SLM has no photodiodes and does not rectify. A light projection system (100) in which one or more SLMs (128, 130, 132) are placed includes a write (image definition) UV light path (102) and a read (illumination) visible light path (104) to form a color image projection display. The write UV light propagates from an image display pattern source (120) and either sequentially or continuously writes image patterns on the photoconductive SLMs. The read visible light propagates through the SLM and is modulated by an electro-optical material, the optical properties of which change in response to the image structure carried by the write light. The result is a high efficiency display system that delivers high resolution color images through a projection lens (190) onto a display screen.Type: GrantFiled: May 24, 2005Date of Patent: August 2, 2011Assignee: Compound Photonics LimitedInventors: Jonathan A. Sachs, Howard V. Goetz, David Keith, Lin Li, Steven H. Linn, Alexander Parfenov, Stephen E. Brice, Terry J. Scheffer, James A. Van Vechten, Jiuzhi Xue
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Patent number: 7973998Abstract: The present invention discloses a multilayer dielectric optical structure wherein one of the optical materials in the multilayer structure shows an optically isotropic state above and a birefringent state below a characteristic temperature Tc near the room temperature. The optical structure reflects a predetermined wavelength range of electromagnetic radiation above the Tc but allow the same to transmit through below the Tc. The predetermined wavelength can be the near infrared radiation from 700 nm to 2500 nm, and the optical structure rejects solar heat in warm summer days but admits the same to interior on a colder winter day.Type: GrantFiled: May 19, 2008Date of Patent: July 5, 2011Assignee: Serious Materials, Inc.Inventor: Jiuzhi Xue
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Patent number: 7965359Abstract: Self-compensating, quasi-homeotropic liquid crystal devices (100, 200, 300, 400) overcome the contrast reducing effects of smaller pretilt angles. The devices exhibit extremely high contrast ratio but at the same time suppress fringe field-induced disclination lines in high pixel density and small pixel size quasi-homeotropic displays. The surface pretilt (520, 540) and cell twist (570) angles are set at values that, in combination, contribute to establishing a cuspate singularity in the contrast ratio for normally incident light in response to a drive signal switching the liquid crystal device to the OFF director field state that provides nearly 0% optical efficiency. The OFF director field state corresponds to a subthreshold drive level that provides for the liquid crystal device self-compensation for in plane optical retardation.Type: GrantFiled: July 26, 2007Date of Patent: June 21, 2011Assignee: Cuspate, LLCInventors: Terry J. Scheffer, Jiuzhi Xue
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Publication number: 20100118380Abstract: The present invention discloses a multilayer dielectric optical structure wherein one of the optical materials in the multilayer structure shows an optically isotropic state above and a birefringent state below a characteristic temperature Tc near the room temperature. The optical structure reflects a predetermined wavelength range of electromagnetic radiation above the Tc but allow the same to transmit through below the Tc. The predetermined wavelength can be the near infrared radiation from 700 nm to 2500 nm, and the optical structure rejects solar heat in warm summer days but admits the same to interior on a colder winter day.Type: ApplicationFiled: January 15, 2010Publication date: May 13, 2010Inventor: Jiuzhi Xue
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Publication number: 20090284670Abstract: A window having electrically controllable transmission and reflection includes a layer of liquid crystal material and polarizers on either side thereof. Different combinations of absorptive and reflective polarizers are disclosed. These different combinations can be used in different applications to achieve the desired results. Transparent, conductive layers are provided to apply an electrical field to the liquid crystal material so as to selectively control the rotation of the polarization of light passing therethrough.Type: ApplicationFiled: April 27, 2009Publication date: November 19, 2009Inventor: Jiuzhi Xue
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Publication number: 20090262291Abstract: Self-compensating, quasi-homeotropic liquid crystal devices (100, 200, 300, 400) overcome the contrast reducing effects of smaller pretilt angles. The devices exhibit extremely high contrast ratio but at the same time suppress fringe field-induced disclination lines in high pixel density and small pixel size quasi-homeotropic displays. The surface pretilt (520, 540) and cell twist (570) angles are set at values that, in combination, contribute to establishing a cuspate singularity in the contrast ratio for normally incident light in response to a drive signal switching the liquid crystal device to the OFF director field state that provides nearly 0% optical efficiency. The OFF director field state corresponds to a subthreshold drive level that provides for the liquid crystal device self-compensation for in plane optical retardation.Type: ApplicationFiled: July 26, 2007Publication date: October 22, 2009Inventors: Terry J. Scheffer, Jiuzhi Xue
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Publication number: 20090219603Abstract: The present invention discloses a multilayer dielectric optical structure wherein one of the optical materials in the multilayer structure shows an optically isotropic state above and a birefringent state below a characteristic temperature Tc near the room temperature. The optical structure reflects a predetermined wavelength range of electromagnetic radiation above the Tc but allow the same to transmit through below the Tc. The predetermined wavelength can be the near infrared radiation from 700 nm to 2500 nm, and the optical structure rejects solar heat in warm summer days but admits the same to interior on a colder winter day.Type: ApplicationFiled: May 19, 2008Publication date: September 3, 2009Inventor: Jiuzhi Xue
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Patent number: 7525604Abstract: A window having electrically controllable transmission and reflection includes a layer of liquid crystal material and polarizers on either side thereof. Different combinations of absorptive and reflective polarizers are disclosed. These different combinations can be used in different applications to achieve the desired results. Transparent, conductive layers are provided to apply an electrical field to the liquid crystal material so as to selectively control the rotation of the polarization of light passing therethrough.Type: GrantFiled: March 15, 2006Date of Patent: April 28, 2009Assignee: Naxellent, LLCInventor: Jiuzhi Xue
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Publication number: 20080239458Abstract: An optically addressed, photoconductive spatial light modulator (SLM) operates in a transmissive mode and is capable of modulating a wide spectrum of visible light. There is no pixel structure or native pixel resolution in the SLM. The SLM has no photodiodes and does not rectify. A light projection system (100) in which one or more SLMs (128, 130, 132) are placed includes a write (image definition) UV light path (102) and a read (illumination) visible light path (104) to form a color image projection display. The write UV light propagates from an image display pattern source (120) and either sequentially or continuously writes image patterns on the photoconductive SLMs. The read visible light propagates through the SLM and is modulated by an electro-optical material, the optical properties of which change in response to the image structure carried by the write light. The result is a high efficiency display system that delivers high resolution color images through a projection lens (190) onto a display screen.Type: ApplicationFiled: May 24, 2005Publication date: October 2, 2008Inventors: Jonathan A. Sachs, Howard V. Goetz, David Keith, Lin Li, Steven H. Linn, Alexander Parfenov, Stephen E. Brice, Terry Scheffer, James A. Van Vechten, Jiuzhi Xue
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Patent number: 7379144Abstract: An optical device includes a ferroelectric liquid crystal material. This optical device has a first and a second substrate. A first alignment treatment is applied to a surface of the first substrate, the first alignment treatment being intended to induce an orientation of at least a portion of the ferroelectric liquid crystal material along a first alignment direction with a first pretilt angle ?1 with respect to a plane parallel to the first substrate. A second alignment treatment is applied to a surface of the second substrate, the second alignment treatment being intended to induce an orientation of at least another portion of the ferroelectric liquid crystal material along a second alignment direction with a second pretilt angle ?2 with respect to a plane parallel to the second substrate.Type: GrantFiled: June 9, 2000Date of Patent: May 27, 2008Assignee: Displaytech, Inc.Inventors: Jiuzhi Xue, Beth L. Ellis, Stephen H. Perlmutter, Charles Crandall
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Patent number: 7300167Abstract: An adjustably opaque window including an external pane, an internal pane, a light transmission control layer and a shock-absorbing layer is provided. The external pane and the internal pane provide a cavity between them, and the light transmission control layer and the shock-absorbing layer are positioned in the cavity. The shock-absorbing layer is a flexible sheet that supports and protects the light transmission control layer. The light transmission layer consists of liquid crystal cells. The transmission ratio of the cells can be controlled variably.Type: GrantFiled: December 9, 2005Date of Patent: November 27, 2007Assignee: LCT Enterprises, LLCInventors: Primal Fernando, Noel Clark, Jiuzhi Xue
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Publication number: 20060274218Abstract: A window having electrically controllable transmission and reflection includes a layer of liquid crystal material and polarizers on either side thereof. Different combinations of absorptive and reflective polarizers are disclosed. These different combinations can be used in different applications to achieve the desired results. Transparent, conductive layers are provided to apply an electrical field to the liquid crystal material so as to selectively control the rotation of the polarization of light passing therethrough.Type: ApplicationFiled: March 15, 2006Publication date: December 7, 2006Inventor: Jiuzhi Xue
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Publication number: 20060098290Abstract: An adjustably opaque window including an external pane, an internal pane, a light transmission control layer and a shock-absorbing layer is provided. The external pane and the internal pane provide a cavity between them, and the light transmission control layer and the shock-absorbing layer are positioned in the cavity. The shock-absorbing layer is a flexible sheet that supports and protects the light transmission control layer. The light transmission layer consists of liquid crystal cells. The transmission ratio of the cells can be controlled variably.Type: ApplicationFiled: December 9, 2005Publication date: May 11, 2006Inventors: Primal Fernando, Noel Clark, Jiuzhi Xue
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Publication number: 20050068629Abstract: An adjustably opaque window including an external pane, an internal pane, a light transmission control layer and a shock-absorbing layer is provided. The external pane and the internal pane provide a cavity between them, and the light transmission control layer and the shock-absorbing layer are positioned in the cavity. The shock-absorbing layer is a flexible sheet that supports and protects the light transmission control layer. The light transmission layer consists of liquid crystal cells. The transmission ratio of the cells can be controlled variably.Type: ApplicationFiled: September 26, 2003Publication date: March 31, 2005Inventors: Primal Fernando, Noel Clark, Jiuzhi Xue
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Patent number: 6870163Abstract: Bistable and analog FLC devices employing chiral nonracemic liquid crystal materials exhibiting de Vries smectic A phases. The invention provides certain liquid crystal material that can be employed in both bistable and analog device configurations. The invention also provides a method for identifying liquid crystal materials that will exhibit both bookshelf structure in SSFLC cells and provide V-shaped switching in an analog device configuration.Type: GrantFiled: September 1, 2000Date of Patent: March 22, 2005Assignee: Displaytech, Inc.Inventors: Jiuzhi Xue, David M. Walba
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Patent number: 6636681Abstract: A variable optical attenuator having a multiple quantum well structure (MQWS), a feedback system that provides a feedback signal, and a current control that utilizes the feedback signal to regulate the attenuation of the MQWS. In one embodiment, the MQWS is part of a photo intrinsic diode, and in another embodiment it is part of a self-electro-optic effect device (SEED). Preferably, there are a plurality of MQWSs, which may be arranged in a serial stack or may be arranged in a plane parallel to the MQWS layers, with light passed from one MQWS to the next via prisms. Preferably, the beam is separated into component wavelengths by a demultiplexer, each wavelength is attenuated by one or more MQWSs designed to attenuate that wavelength, and the beam is then recombined with an optical multiplexer. In another embodiment, the attenuator is combined with an erbium-doped fiber amplifier (EDFA) to provide an amplifier having an essentially flat gain as a function of wavelength.Type: GrantFiled: May 7, 2001Date of Patent: October 21, 2003Assignee: Photonport Technologies, Inc.Inventors: Lianhua Ji, Jiuzhi Xue
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Patent number: 6507330Abstract: A method of operating a liquid crystal cell includes DC-balancing by displaying an inverse image with electric fields of increased magnitude relative to the image producing electric fields. While the inverse image is displayed the image is prevented from being visible by either turning off the light source or re-directing or blocking the light from reaching the viewing area. The image producing electric fields and the inverse image producing electric fields are such that the cumulative time integral of the electric fields that are present in one direction across the liquid crystal material is substantially equal to the cumulative time integral of the electric fields that are present in the opposite direction during the given period of time during the operation of liquid crystal cell. The time duration of the inverse image portion is shorter than the time duration of the image portion by an amount proportional to the increased magnitude of the additional electric fields.Type: GrantFiled: March 14, 2001Date of Patent: January 14, 2003Assignee: Displaytech, Inc.Inventors: Mark A. Handschy, Jiuzhi Xue, Lianhua Ji
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Publication number: 20020164146Abstract: A variable optical attenuator having a multiple quantum well structure (MQWS), a feedback system that provides a feedback signal, and a current control that utilizes the feedback signal to regulate the attenuation of the MQWS. In one embodiment, the MQWS is part of a photo intrinsic diode, and in another embodiment it is part of a self-electro-optic effect device (SEED). Preferably, there are a plurality of MQWSs, which may be arranged in a serial stack or may be arranged in a plane parallel to the MQWS layers, with light passed from one MQWS to the next via prisms. Preferably, the beam is separated into component wavelengths by a demultiplexer, each wavelength is attenuated by one or more MQWSs designed to attenuate that wavelength, and the beam is then recombined with an optical multiplexer. In another embodiment, the attenuator is combined with an erbium-doped fiber amplifier (EDFA) to provide an amplifier having an essentially flat gain as a function of wavelength.Type: ApplicationFiled: May 7, 2001Publication date: November 7, 2002Applicant: Photonport Technologies, Inc.Inventors: Lianhua Ji, Jiuzhi Xue