CA2247625A1 - Display brightness enhancement film - Google Patents

Display brightness enhancement film

Info

Publication number
CA2247625A1
CA2247625A1 CA002247625A CA2247625A CA2247625A1 CA 2247625 A1 CA2247625 A1 CA 2247625A1 CA 002247625 A CA002247625 A CA 002247625A CA 2247625 A CA2247625 A CA 2247625A CA 2247625 A1 CA2247625 A1 CA 2247625A1
Authority
CA
Canada
Prior art keywords
film
disperse phase
chosen
display brightness
brightness enhancement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002247625A
Other languages
French (fr)
Other versions
CA2247625C (en
Inventor
Richard C. Allen
Lockwood W. Carlson
Andrew J. Ouderkirk
Michael F. Weber
Arthur L. Kotz
Timothy J. Nevitt
Carl A. Stover
Biswaroop Majumdar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining And Manufacturing Company
Richard C. Allen
Lockwood W. Carlson
Andrew J. Ouderkirk
Michael F. Weber
Arthur L. Kotz
Timothy J. Nevitt
Carl A. Stover
Biswaroop Majumdar
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/610,092 external-priority patent/US5825543A/en
Application filed by Minnesota Mining And Manufacturing Company, Richard C. Allen, Lockwood W. Carlson, Andrew J. Ouderkirk, Michael F. Weber, Arthur L. Kotz, Timothy J. Nevitt, Carl A. Stover, Biswaroop Majumdar filed Critical Minnesota Mining And Manufacturing Company
Publication of CA2247625A1 publication Critical patent/CA2247625A1/en
Application granted granted Critical
Publication of CA2247625C publication Critical patent/CA2247625C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3008—Polarising elements comprising dielectric particles, e.g. birefringent crystals embedded in a matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers

Abstract

An optical film is provided which comprises a disperse phase of polymeric particles disposed within a continuous birefringent matrix in combination with light directing materials to enable control of light emitted from a lighting fixture or display. The film is oriented, typically by stretching, in one or more directions. The size and shape of the disperse phase particles, the volume fraction of the disperse phase, the film thickness, and the amount of orientation are chosen to attain a desired degree of diffuse reflection and total transmission of electromagnetic radiation of a desired wavelength in the resulting film, and the light directing materials are chosen to control the direction of polarized light reflected from or transmitted by the optical film.
CA002247625A 1996-02-29 1997-02-28 Display brightness enhancement film Expired - Fee Related CA2247625C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US08/610,092 1996-02-29
US08/610,092 US5825543A (en) 1996-02-29 1996-02-29 Diffusely reflecting polarizing element including a first birefringent phase and a second phase
US08/807,262 US6111696A (en) 1996-02-29 1997-02-28 Brightness enhancement film
PCT/US1997/003871 WO1997032226A1 (en) 1996-02-29 1997-02-28 Brightness enhancement film
US08/807,262 1997-02-28

Publications (2)

Publication Number Publication Date
CA2247625A1 true CA2247625A1 (en) 1997-09-04
CA2247625C CA2247625C (en) 2006-05-30

Family

ID=27086190

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002247625A Expired - Fee Related CA2247625C (en) 1996-02-29 1997-02-28 Display brightness enhancement film

Country Status (9)

Country Link
US (1) US6760157B1 (en)
EP (1) EP0883824B1 (en)
JP (2) JP4870248B2 (en)
CN (1) CN1121622C (en)
AU (1) AU713583B2 (en)
BR (1) BR9707795A (en)
CA (1) CA2247625C (en)
DE (1) DE69721505T2 (en)
WO (1) WO1997032226A1 (en)

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US6760157B1 (en) 2004-07-06
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AU713583B2 (en) 1999-12-02
DE69721505T2 (en) 2003-11-20
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JP4870248B2 (en) 2012-02-08
EP0883824B1 (en) 2003-05-02
AU2528597A (en) 1997-09-16
BR9707795A (en) 1999-07-27
CN1216114A (en) 1999-05-05
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CA2247625C (en) 2006-05-30
WO1997032226A1 (en) 1997-09-04

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