WO2009102731A3 - Devices and methods for enhancing brightness of displays using angle conversion layers - Google Patents

Devices and methods for enhancing brightness of displays using angle conversion layers Download PDF

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Publication number
WO2009102731A3
WO2009102731A3 PCT/US2009/033698 US2009033698W WO2009102731A3 WO 2009102731 A3 WO2009102731 A3 WO 2009102731A3 US 2009033698 W US2009033698 W US 2009033698W WO 2009102731 A3 WO2009102731 A3 WO 2009102731A3
Authority
WO
WIPO (PCT)
Prior art keywords
light
angle
displays
methods
devices
Prior art date
Application number
PCT/US2009/033698
Other languages
French (fr)
Other versions
WO2009102731A8 (en
WO2009102731A2 (en
Inventor
Ion Bita
Gang Xu
Marek Mienko
Lai Wang
Russell W. Gruhlke
Original Assignee
Qualcomm Mems Technologies, Inc.
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
Application filed by Qualcomm Mems Technologies, Inc. filed Critical Qualcomm Mems Technologies, Inc.
Publication of WO2009102731A2 publication Critical patent/WO2009102731A2/en
Publication of WO2009102731A3 publication Critical patent/WO2009102731A3/en
Publication of WO2009102731A8 publication Critical patent/WO2009102731A8/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/001—Optical devices or arrangements for the control of light using movable or deformable optical elements based on interference in an adjustable optical cavity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide

Abstract

Various embodiments of the present invention relate to enhancing the brightness of displays that employ illumination systems. In some embodiments, the illumination systems include light guides (802), diffractive microstructure (910), and light-turning features (903). The diffractive microstructure may be configured to receive ambient light at a first angle and produce diffracted light at a second angle greater than the first angle and greater than the critical angle for of light guide. The light is thereby guided within the light guide. The light-turning features may be configured to turn the light guided within the light guide out of a light guide and onto, for example, the pixels (901) of a spatial light modulator at near normal incidence.
PCT/US2009/033698 2008-02-12 2009-02-10 Devices and methods for enhancing brightness of displays using angle conversion layers WO2009102731A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2814508P 2008-02-12 2008-02-12
US61/028,145 2008-02-12

Publications (3)

Publication Number Publication Date
WO2009102731A2 WO2009102731A2 (en) 2009-08-20
WO2009102731A3 true WO2009102731A3 (en) 2009-11-26
WO2009102731A8 WO2009102731A8 (en) 2010-01-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/033698 WO2009102731A2 (en) 2008-02-12 2009-02-10 Devices and methods for enhancing brightness of displays using angle conversion layers

Country Status (2)

Country Link
US (2) US8040589B2 (en)
WO (1) WO2009102731A2 (en)

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