Patents by Inventor Tri D. Pham

Tri D. Pham 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).

  • Publication number: 20190219743
    Abstract: Optical diffusing films are made by microreplication from a structured surface tool. The tool is made using a 2-part electroplating process, wherein a first electroplating procedure forms a first metal layer with a first major surface, and a second electroplating procedure forms a second metal layer on the first metal layer, the second metal layer having a second major surface with a smaller average roughness than that of the first major surface. The second major surface can function as the structured surface of the tool. A replica of this surface can then be made in a major surface of an optical film to provide light diffusing properties. The structured surface and/or its constituent structures can be characterized in terms of various parameters such as optical haze, optical clarity, Fourier power spectra of the topography along orthogonal in-plane directions, ridge length per unit area, equivalent circular diameter (ECD), and/or aspect ratio.
    Type: Application
    Filed: October 10, 2018
    Publication date: July 18, 2019
    Inventors: Tri D. Pham, Steven H. Kong, Haiyan Zhang, Joseph T. Aronson, Michael R. Leaf, Gary T. Boyd, Nicholas A. Johnson, Qingbing Wang
  • Patent number: 10295710
    Abstract: Optical diffusing films are made by microreplication from a structured surface tool. The tool is made using a 2-part electroplating process, wherein a first electroplating procedure forms a first metal layer with a first major surface, and a second electroplating procedure forms a second metal layer on the first metal layer, the second metal layer having a second major surface with a smaller average roughness than that of the first major surface. The second major surface can function as the structured surface of the tool. A replica of this surface can then be made in a major surface of an optical film to provide light diffusing properties. The structured surface and/or its constituent structures can be characterized in terms of various parameters such as optical haze, optical clarity, Fourier power spectra of the topography along orthogonal in-plane directions, ridge length per unit area, equivalent circular diameter (ECD), and/or aspect ratio.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: May 21, 2019
    Assignee: 3M Innovative Properties Company
    Inventors: Tri D. Pham, Steven H. Kong, Haiyan Zhang, Joseph T. Aronson, Michael R. Leaf, Gary T. Boyd, Nicholas A. Johnson, Qingbing Wang
  • Publication number: 20190094418
    Abstract: Optical films for redirecting light are described, and optical systems, such as display systems, incorporating such optical films are described. The optical film may include a first structured surface including a plurality of prismatic structures, and a second structured surface opposing the first structured surface and including a plurality of microstructures. An effective transmission of the optical film is not more than 1% less than a film with a comparable construction except for a smooth, non-structured second surface.
    Type: Application
    Filed: November 9, 2018
    Publication date: March 28, 2019
    Inventors: Robert A. Yapel, Joseph T. Aronson, Matthew R.C. Atkinson, Gary T. Boyd, Slah Jendoubi, Mitchell A.F. Johnson, Scott R. Kaytor, Steven H. Kong, Fei Lu, Tri D. Pham, Robert B. Secor, Steven D. Solomonson
  • Patent number: 10156661
    Abstract: An optical film having a structured surface is described. At least 90% of the structured surface has a slope magnitude that is less than about 5 degrees. The optical film may have an optical haze of less than about 10% and an optical clarity of less than about 50%, or may have an optical haze of less than about 7.5% and an optical clarity of less than about 60%, or may have an optical haze of less than about 3% and an optical clarity of less than about 65%.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: December 18, 2018
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Robert A. Yapel, Joseph T. Aronson, Matthew R. C. Atkinson, Gary T. Boyd, Slah Jendoubi, Mitchell A. F. Johnson, Scott R. Kaytor, Steven H. Kong, Fei Lu, Tri D. Pham, Robert B. Secor, Steven D. Solomonson
  • Publication number: 20180224582
    Abstract: An optical film assembly comprising a first optical film, a coupling member, and a second optical film wherein the first optical film comprises a prismatic film, the second optical film comprises a diffuser, wherein the coupling member is bonded to the first optical film and to the second optical film such that the first optical film and second optical film are physically coupled, and the coupling member is bonded to at least one of the first optical film and the second optical film non-continuously such that an optically effective air gap is provided. Also, a method for making such optical film assemblies.
    Type: Application
    Filed: August 5, 2016
    Publication date: August 9, 2018
    Inventors: Qingbing Wang, Encai Hao, Tri D. Pham, Daniel J. Theis, Matthew S. Stay
  • Publication number: 20180217300
    Abstract: A diffuser including opposing structured first and second major surfaces is described. The first major surface includes a first plurality of surface structures providing a uniform first haze. The second major surface includes a first portion adjacent an edge and a second portion adjacent the first portion. The first portion includes a first region and a second region between the first region and the second portion. The second major surface includes a second plurality of surface structures providing a uniform second haze over the second portion and providing a third haze in the first portion. The third haze in the first region is higher than the second haze, and the third haze in the second region is monotonically decreasing. The second portion has a surface area of at least 90 percent of a surface area of the second major surface.
    Type: Application
    Filed: April 14, 2016
    Publication date: August 2, 2018
    Inventors: Gary T. Boyd, Tri D. Pham, Nicholas A. Johnson, Oanh V. Pham, Sara S. Merritt, Stephen J. Etzkorn, Haiyan Zhang, Corey D. Balts, Joseph T. Aronson
  • Patent number: 9625640
    Abstract: Optical films, optical stacks including the optical films, and display systems including the optical films are described. The optical film includes a first major surface that may include a plurality of first microstructures that extend along a first direction. The optical film also includes a second major surface that is opposite to the first major surface and includes a plurality of second microstructures. The second major surface has an optical haze that is not greater than about 3% and an optical clarity that is not greater than about 85%.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: April 18, 2017
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Joseph T. Aronson, Slah Jendoubi, Mitchell A. F. Johnson, Scott R. Kaytor, Tri D. Pham, Robert A. Yapel, Joseph A. Zigal, Steven J. McMan, Steven D. Solomonson, Steven Hin-Chung Kong, Fei Lu, Gary T. Boyd
  • Patent number: 9618791
    Abstract: The present disclosure describes an optical stack that includes an asymmetric diffuser. As described herein, use of an asymmetric diffuser in an optical stack reduces undesirable defects in a display while maintaining optical gain and/or contrast of the display. The asymmetric diffuser is less diffusive along a first direction that is parallel with linearly extending structures of an associated light directing film.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: April 11, 2017
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Adam D. Haag, Tri D. Pham, Steven H. C. Kong, Stephen J. Etzkorn, Robert L. Endres, Matthew B. Johnson
  • Publication number: 20160216413
    Abstract: A microstructured diffuser is described comprising a light transmissive film comprising a first microstructured surface comprising a plurality of peaks and valleys. A coating is disposed on the first microstructured surface. The coating partially fills the valleys forming a second microstructured surface.
    Type: Application
    Filed: September 24, 2014
    Publication date: July 28, 2016
    Inventors: Nathaniel K. Naismith, William F. Edmonds, Jason S. Petaja, Brandt K. Carter, Jeffrey L. Solomon, Sara S. Merritt, Tri D. Pham
  • Patent number: 9383482
    Abstract: The present invention concerns antireflective films comprising a high refractive index layer (60) and low refractive index layer (80) disposed on the high refractive index layer. The antireflective films have a microstructured surface (70) that can be derived from a microreplicated tool.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: July 5, 2016
    Assignee: 3M Innovative Properties Company
    Inventors: Christopher B. Walker, Jr., Christopher P. Tebow, Tri D. Pham, Steven H. Kong, Joseph T. Aronson, Kyle J. Lindstrom, Michael K. Gerlach, Michelle L. Toy, Taun L. McKenzie, Anthony M. Renstrom, Robert A. Yapel, Mitchell A. F. Johnson
  • Publication number: 20160146982
    Abstract: Brightness enhancing films with embedded diffusers are described. More specifically, films including a birefringent substrate, a prismatic layer carried by the substrate having linear prisms, and an embedded structured surface disposed between the substrate and the prismatic layer are disclosed. The embedded structured surface may include closely-packed structures. Processes for producing embedded structured surfaces having particular topographies are also disclosed.
    Type: Application
    Filed: December 5, 2013
    Publication date: May 26, 2016
    Inventors: Gary T. Boyd, Steven H. Kong, Tri D. Pham, Qingbing Wang
  • Publication number: 20160103270
    Abstract: Optical films, optical stacks including the optical films, and display systems including the optical films are described. The optical film includes a first major surface that may include a plurality of first microstructures that extend along a first direction. The optical film also includes a second major surface that is opposite to the first major surface and includes a plurality of second microstructures. The second major surface has an optical haze that is not greater than about 3% and an optical clarity that is not greater than about 85%.
    Type: Application
    Filed: November 24, 2015
    Publication date: April 14, 2016
    Inventors: Joseph T. Aronson, Slah Jendoubi, Mitchell A.F. Johnson, Scott R. Kaytor, Tri D. Pham, Robert A. Yapel, Joseph A. Zigal, Steven J. McMan, Steven D. Solomonson, Steven Hin-Chung Kong, Fei Lu, Gary T. Boyd
  • Patent number: 9229239
    Abstract: Light redirecting film is disclosed. The light redirecting film includes a first major surface that includes a plurality of first microstructures that extend along a first direction. The light redirecting film also includes a second major surface that is opposite to the first major surface and includes a plurality of second microstructures. The second major surface has an optical haze that is not greater than about 3% and an optical clarity that is not greater than about 85%. The light redirecting film has an average effective transmission that is not less than about 1.75.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: January 5, 2016
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Joseph T. Aronson, Slah Jendoubi, Mitchell A. F. Johnson, Scott R. Kaytor, Tri D. Pham, Robert A. Yapel, Joseph A. Zigal, Steven J. McMan, Steven D. Solomonson, Steven Hin-Chung Kong, Fei Lu, Gary T. Boyd
  • Publication number: 20150293272
    Abstract: Optical diffusing films are made by microreplication from a structured surface tool. The tool is made using a 2-part electroplating process, wherein a first electroplating procedure forms a first metal layer with a first major surface, and a second electroplating procedure forms a second metal layer on the first metal layer, the second metal layer having a second major surface with a smaller average roughness than that of the first major surface. The second major surface can function as the structured surface of the tool. A replica of this surface can then be made in a major surface of an optical film to provide light diffusing properties. The structured surface and/or its constituent structures can be characterized in terms of various parameters such as optical haze, optical clarity, Fourier power spectra of the topography along orthogonal in-plane directions, ridge length per unit area, equivalent circular diameter (ECD), and/or aspect ratio.
    Type: Application
    Filed: November 19, 2013
    Publication date: October 15, 2015
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Tri D. Pham, Steven H. Kong, Haiyan Zhang, Joseph T. Aronson, Michael R. Leaf, Gary T. Boyd, Nicholas A. Johnson, Qingbing Wang
  • Patent number: 8947799
    Abstract: Light directing film is disclosed. The light directing film includes a first structured major surface and an opposing second major surface. The first structured major surface includes a plurality of unitary discrete structures. Each unitary discrete structure includes a light directing portion that is primarily for directing light and includes a plurality of first side facets. Each first side facet makes an angle with the plane of the light directing film in a range from about 35 degrees to about 55 degrees. Each light directing portion also includes a first base that is defined by the plurality of first side facets and has a first minimum dimension. Each light directing portion also has a first maximum height. Each unitary discrete structure also includes a bonding portion that is primarily for bonding the light directing film to a surface. The bonding portion is disposed on and between the plurality of first side facets and includes a plurality of second side facets.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: February 3, 2015
    Assignee: 3M Innovative Properties Company
    Inventors: William F. Edmonds, Vivian W. Jones, Keith M. Kotchick, Tri D. Pham, John F. Van Derlofske, III
  • Publication number: 20140355125
    Abstract: Example light management films are described. In one example, an optical stack comprises a first light directing film comprising a structured major surface opposite a second major surface, the structured major surface comprising a plurality of linear structures extending along a first direction, the light directing film having an average effective transmission of at least 1.3; and an asymmetric light diffuser disposed on the light directing film and being more diffusive along a second direction and less diffusive along a third direction orthogonal to the second direction, the second direction making an angle with the first direction that is greater than zero and less than 60 degrees.
    Type: Application
    Filed: December 18, 2012
    Publication date: December 4, 2014
    Inventors: Gary T. Boyd, Qingbing Wang, Tri D. Pham
  • Patent number: 8888333
    Abstract: Light redirecting film is disclosed. The light redirecting film includes a first major surface that includes a plurality of first microstructures that extend along a first direction. The light redirecting film also includes a second major surface that is opposite to the first major surface and includes a plurality of second microstructures. The second major surface has an optical haze that is in a range from about 4% to about 20% and an optical clarity that is in a range from about 20% to about 60%. The light redirecting film has an average effective transmission that is not less than about 1.55.
    Type: Grant
    Filed: August 11, 2010
    Date of Patent: November 18, 2014
    Assignee: 3M Innovative Properties Company
    Inventors: Robert A. Yapel, Mitchell A. F. Johnson, Tri D. Pham, Joseph T. Aronson, Steven D. Solomonson, Scott R. Kaytor, Steven J. McMan, Fei Lu, Steven H. Kong, Slah Jendoubi, Gary T. Boyd
  • Publication number: 20140313587
    Abstract: Light redirecting film is disclosed. The light redirecting film includes a first major surface that includes a plurality of first microstructures that extend along a first direction. The light redirecting film also includes a second major surface that is opposite to the first major surface and includes a plurality of second microstructures. The second major surface has an optical haze that is not greater than about 3% and an optical clarity that is not greater than about 85%. The light redirecting film has an average effective transmission that is not less than about 1.75.
    Type: Application
    Filed: February 21, 2014
    Publication date: October 23, 2014
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Joseph T. Aronson, Slah Jendoubi, Mitchell A.F. Johnson, Scott R. Kaytor, Tri D. Pham, Robert A. Yapel, Joseph A. Zigal, Steven J. McMan, Steven D. Solomonson, Steven Hin-Chung Kong, Fei Lu, Gary T. Boyd
  • Publication number: 20140285749
    Abstract: The present disclosure describes an optical stack that includes an asymmetric diffuser. As described herein, use of an asymmetric diffuser in an optical stack reduces undesirable defects in a display while maintaining optical gain and/or contrast of the display.
    Type: Application
    Filed: November 21, 2012
    Publication date: September 25, 2014
    Inventors: Adam D. Haag, Tri D. Pham, Steven H.C. Kong, Stephen J. Etzkorn, Robert L. Endres, Matthew B. Johnson
  • Patent number: 8827532
    Abstract: Lightguides are disclosed. More particularly, lightguides that include a lightguiding layer and a light extracting layer having a structured surface are disclosed. The light guiding layer is optically coupled to a first set of structures of the structured surface at given locations, and is not optically coupled to a second set of structures at given locations, thereby producing total internal reflection at the second locations. The selective optical coupling may be achieved by a number of different contemplated means as discussed herein. The lightguides allow for distribution of light along with redirection towards an image viewer without a number of commonly required optical elements in backlights.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: September 9, 2014
    Assignee: 3M Innovative Properties Company
    Inventors: Qingbing Wang, Gary T. Boyd, Tri D. Pham, Robert Lee Erwin, David Scott Thompson