Patents by Inventor Philip J. Ralli
Philip J. Ralli 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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Publication number: 20230267863Abstract: The present disclosure generally relates to micro-ribbon structures used in display systems and methods of fabrication thereof. Individual fibers are made using an extrusion process whereby a core surrounded by an ink portion is extruded to create an individual fiber. The ink portion may include both an inner portion that is in contact with the core and an outer shell portion over the inner portion. The individual fibers are then bonded to adjacent fibers to create micro-ribbon structures. The micro-ribbon structures are of one color and spaced from adjacent micro-ribbon structures of a different color by a light blocking fiber. The micro-ribbon structures are each bonded to the light blocking fiber to create the color stripes used in the display system.Type: ApplicationFiled: February 23, 2022Publication date: August 24, 2023Applicant: Prysm Systems, Inc.Inventors: Robert L. GRAVES, Philip J. RALLI
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Patent number: 10317787Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: GrantFiled: August 3, 2018Date of Patent: June 11, 2019Assignee: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Publication number: 20180348621Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: ApplicationFiled: August 3, 2018Publication date: December 6, 2018Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Patent number: 10095099Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: GrantFiled: June 23, 2017Date of Patent: October 9, 2018Assignee: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Patent number: 9995997Abstract: A multi-layer display screen capable of being tiled without a visible gap between tiled screens and methods of using said device are described herein. In one embodiment, a system includes a light generator configured to produce light and a multi-layer screen with a plurality of layers. The multi-layer screen can be configured to permit the light from the light generator to propagate therethrough. The plurality of layers can include an opaque region layer having a plurality of opaque regions and a first layer comprising one or more abutted layers disposed within a common plane, the abutted layers spaced apart by a gap, wherein the gap is coincident with the opaque region.Type: GrantFiled: October 2, 2013Date of Patent: June 12, 2018Assignee: PRYSM, Inc.Inventors: Roger A. Hajjar, Philip J. Ralli, John L. Ritter
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Publication number: 20170363945Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: ApplicationFiled: June 23, 2017Publication date: December 21, 2017Applicant: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Patent number: 9690181Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: GrantFiled: October 8, 2015Date of Patent: June 27, 2017Assignee: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Publication number: 20170104964Abstract: A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.Type: ApplicationFiled: October 8, 2015Publication date: April 13, 2017Applicant: Prysm, Inc.Inventors: Robert L. Graves, Michael P. McMahon, Philip J. Ralli
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Publication number: 20150241765Abstract: A multi-layer display screen capable of being tiled without a visible gap between tiled screens and methods of using said device are described herein. In one embodiment, a system includes a light generator configured to produce light and a multi-layer screen with a plurality of layers. The multi-layer screen can be configured to permit the light from the light generator to propagate therethrough. The plurality of layers can include an opaque region layer having a plurality of opaque regions and a first layer comprising one or more abutted layers disposed within a common plane, the abutted layers spaced apart by a gap, wherein the gap is coincident with the opaque region.Type: ApplicationFiled: October 2, 2013Publication date: August 27, 2015Applicant: PRYSM, INC.Inventors: Roger A. Hajjar, Philip J. Ralli, John L. Ritter
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Patent number: 8809811Abstract: Embodiments of fluorescent display screens having an intermediate layer between a light-emitting fluorescent layer and an excitation filter layer are disclosed. The intermediate layer includes (1) a low-index layer disposed between the light-emitting fluorescent layer and the excitation filter layer and (2) an index bridging layer disposed between the low-index layer and the excitation filter layer. The insertion of the low-index layer and the index bridging layer according to the above configuration reduces the sensitivity of the excitation coupling to the non-uniformities in the excitation filter layer and variability in the output frequency of the excitation source, leading to improved uniformity of display intensity without significant compromise in the excitation coupling efficiency. A index bridging region made of a hard coat also provides abrasion resistance and provides structure rigidity to the adjacent excitation filter layer.Type: GrantFiled: September 13, 2012Date of Patent: August 19, 2014Assignee: Prysm, Inc.Inventor: Philip J. Ralli
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Publication number: 20140071684Abstract: Embodiments of fluorescent display screens having an intermediate layer between a light-emitting fluorescent layer and an excitation filter layer are disclosed. The intermediate layer includes (1) a low-index layer disposed between the light-emitting fluorescent layer and the excitation filter layer and (2) an index bridging layer disposed between the low-index layer and the excitation filter layer. The insertion of the low-index layer and the index bridging layer according to the above configuration reduces the sensitivity of the excitation coupling to the non-uniformities in the excitation filter layer and variability in the output frequency of the excitation source, leading to improved uniformity of display intensity without significant compromise in the excitation coupling efficiency. A index bridging region made of a hard coat also provides abrasion resistance and provides structure rigidity to the adjacent excitation filter layer.Type: ApplicationFiled: September 13, 2012Publication date: March 13, 2014Inventor: Philip J. Ralli
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Patent number: 7717564Abstract: A projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. The intrinsic polarizer can be an intrinsic polarizer stack including a U.V. curable adhesive.Type: GrantFiled: May 21, 2008Date of Patent: May 18, 2010Assignee: Seiko Epson CorporationInventors: Philip J. Ralli, Pradnya V. Nagarkar, James N. Gordon, Ikuko Ebihara, Charles L. Bruzzone, Giorgio B. Trapani
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Patent number: 7643211Abstract: An intrinsic polarizer, including a sheet of PVA-type matrix that includes vinylene polymer blocks, the sheet defining a pass polarization axis and a block polarization axis perpendicular to the pass polarization axis, light having an electrical vector parallel to the pass polarization axis being substantially transmitted through the sheet and light having an electrical vector parallel to the block polarization axis being substantially absorbed by the vinylene blocks, the sheet exhibiting a dichroic ratio of more than 100.Type: GrantFiled: December 19, 2008Date of Patent: January 5, 2010Assignee: Seiko Epson CorporationInventors: Michael K. Gerlach, Gerald N. Nkwantah, Jonathan M. Mack, Pradnya V. Nagarkar, Philip J. Ralli
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Patent number: 7573637Abstract: An improved method of forming an intrinsic polarizer, referred to as a K-type polarizer, includes stretching a polymeric film a first stretching step. The polymeric film comprises a hydroxylated linear polymer which is converted after the first stretching step to form dichroic, copolymer polyvinylene blocks aligned in the polymeric film. The polymeric film is stretched in a second stretching step while converting the hydroxylated linear polymer. This method produces an improved K-type polarizer with excellent polarizing and color characteristics. For example, the dichroic ratio is higher than 100, the color shift for light passed through the polarizer in a crossed configuration is low, and the absorption of light in the blue region of the visible spectrum is more than one half of the absorption for light in the middle of the visible spectrum.Type: GrantFiled: August 3, 2004Date of Patent: August 11, 2009Assignee: Seiko Epson CorporationInventors: Michael K. Gerlach, Gerald N. Nkwantah, Jonathan M. Mack, Pradnya V. Nagarkar, Philip J. Ralli
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Publication number: 20090134535Abstract: An improved method of forming an intrinsic polarizer, referred to as a K-type polarizer, includes stretching a polymeric film a first stretching step. The polymeric film comprises a hydroxylated linear polymer which is converted after the first stretching step to form dichroic, copolymer polyvinylene blocks aligned in the polymeric film. The polymeric film is stretched in a second stretching step while converting the hydroxylated linear polymer. This method produces an improved K-type polarizer with excellent polarizing and color characteristics. For example, the dichroic ratio is higher than 100, the color shift for light passed through the polarizer in a crossed configuration is low, and the absorption of light in the blue region of the visible spectrum is more than one half of the absorption for light in the middle of the visible spectrum.Type: ApplicationFiled: December 19, 2008Publication date: May 28, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Michael K. Gerlach, Gerald N. Nkwantah, Jonathan M. Mack, Pradnya V. Nagarkar, Philip J. Ralli
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Publication number: 20090135482Abstract: An intrinsic polarizer, including a sheet of PVA-type matrix that includes vinylene polymer blocks, the sheet defining a pass polarization axis and a block polarization axis perpendicular to the pass polarization axis, light having an electrical vector parallel to the pass polarization axis being substantially transmitted through the sheet and light having an electrical vector parallel to the block polarization axis being substantially absorbed by the vinylene blocks, the sheet exhibiting a dichroic ratio of more than 100.Type: ApplicationFiled: December 19, 2008Publication date: May 28, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Michael K. Gerlach, Gerald N. Nkwantah, Jonathan M. Mack, Pradnya V. Nagarkar, Philip J. Ralli
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Publication number: 20080218698Abstract: A projection system including an intrinsic polarizer is disclosed. The projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. An intrinsic polarizer stack including a U.V. curable adhesive is also disclosed.Type: ApplicationFiled: May 21, 2008Publication date: September 11, 2008Inventors: PHILIP J. RALLI, Pradnya V. Nagarkar, James N. Gordon, Ikuko Ebihara, Charles L. Bruzzone, Giorgio B. Trapani
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Patent number: 7391569Abstract: A projection system including an intrinsic polarizer is disclosed. The projection system includes a light source producing illumination light, an imager disposed to receive the illumination light, and a projection lens disposed to receive the illumination light from the imager. The imager includes an intrinsic polarizer. An intrinsic polarizer stack including a U.V. curable adhesive is also disclosed.Type: GrantFiled: May 18, 2005Date of Patent: June 24, 2008Assignee: 3M Innovative Properties CompanyInventors: Philip J. Ralli, Pradnya V. Nagarkar, James N. Gordon, Ikuko Ebihara, Charles L. Bruzzone, Giorgio B. Trapani
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Patent number: 7057682Abstract: A polarizer is used with a liquid crystal display (LCD) cell whose liquid crystal molecules are switched in the plane of the cell. The LCD has birefringent properties that are different from other types of LCD cell and, unlike other types of LCD, the image contrast is maintained and there is little color shift in the dark state when a low birefringence polarizer is used with the SIP LCD cell. In one embodiment, the x-z retardation of the layers between the polarization-sensitive absorbing layer and the LCD is less than 20 nm. In another embodiment, the x-z birefringence is less than 0.0005. The low levels of retardation and birefringence may be achieved by omitting the commonly used cellulose triacetate layer between the polarization-sensitive absorbing layer and the LCD.Type: GrantFiled: December 24, 2003Date of Patent: June 6, 2006Assignee: 3M Innovative Properties Co.Inventors: Philip E. Watson, Philip J. Ralli, John J. Cael
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Patent number: 6122079Abstract: Reflective image-providing displays illuminated with chromatically-adjusted holographically diffused light are provided. In one particular and preferred embodiment, a liquid crystal display component is presented comprising a liquid crystal display element backed with a reflective transmission holographic diffuser. Chromatic adjustment is effected by the inclusion in said liquid crystal display component of a compensatory filter layer of relatively low density designed to restore the ambient color balance of input light, the balance being otherwise upset by transit through said liquid crystal display element. Achromatically illuminated images of good contrast are displayed and viewed from the liquid crystal display component under ambient lighting conditions.Type: GrantFiled: February 28, 1997Date of Patent: September 19, 2000Assignee: Polaroid CorporationInventors: John C. Branca, Jr., Philip J. Ralli, Michael M. Wenyon