CA2174528A1 - Backlighting apparatus employing an array of microprisms - Google Patents

Backlighting apparatus employing an array of microprisms

Info

Publication number
CA2174528A1
CA2174528A1 CA002174528A CA2174528A CA2174528A1 CA 2174528 A1 CA2174528 A1 CA 2174528A1 CA 002174528 A CA002174528 A CA 002174528A CA 2174528 A CA2174528 A CA 2174528A CA 2174528 A1 CA2174528 A1 CA 2174528A1
Authority
CA
Canada
Prior art keywords
light
microprisms
array
slab waveguide
microprism
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
CA002174528A
Other languages
French (fr)
Other versions
CA2174528C (en
Inventor
Karl Wayne Beeson
Scott Moore Zimmerman
Paul Michael Ferm
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.)
Honeywell International Inc
Original Assignee
Karl Wayne Beeson
Scott Moore Zimmerman
Paul Michael Ferm
Alliedsignal Inc.
Honeywell International 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22529283&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2174528(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Karl Wayne Beeson, Scott Moore Zimmerman, Paul Michael Ferm, Alliedsignal Inc., Honeywell International Inc. filed Critical Karl Wayne Beeson
Publication of CA2174528A1 publication Critical patent/CA2174528A1/en
Application granted granted Critical
Publication of CA2174528C publication Critical patent/CA2174528C/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Abstract

An improved backlighting apparatus comprising a slab waveguide (6) that accepts light rays generated by a light source (4) and transmits the light rays via total internal reflection. Attached on one face of the slab waveguide is an array of microprisms (28), with each microprism (28) having a light input surface (30) parallel to a light output surface (32) and at least one sidewall (33) tilted at an angle from the direction normal to the surface of the waveguide (6) such that light rays escape from the slab waveguide (6), reflect off the tilted sidewall (33) and emerge from the microprism (28) as a light source substantially perpendicular to the light output surface (32). An array of microlenses may be positioned to accept the output of the microprisms so that the light exiting from the microlenses is substantially more perpendicular. The backlight apparatus is advantageously used as a backlighting means for flat panel electronic displays.
CA002174528A 1993-11-05 1994-11-02 Backlighting apparatus employing an array of microprisms Expired - Fee Related CA2174528C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/149,219 US5396350A (en) 1993-11-05 1993-11-05 Backlighting apparatus employing an array of microprisms
US08/149,219 1993-11-05
PCT/US1994/012650 WO1995012782A1 (en) 1993-11-05 1994-11-02 Backlighting apparatus employing an array of microprisms

Publications (2)

Publication Number Publication Date
CA2174528A1 true CA2174528A1 (en) 1995-05-11
CA2174528C CA2174528C (en) 2006-07-11

Family

ID=22529283

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002174528A Expired - Fee Related CA2174528C (en) 1993-11-05 1994-11-02 Backlighting apparatus employing an array of microprisms

Country Status (16)

Country Link
US (1) US5396350A (en)
EP (1) EP0727028B1 (en)
JP (1) JP2706574B2 (en)
KR (1) KR100348734B1 (en)
CN (1) CN1097196C (en)
AT (1) ATE180322T1 (en)
AU (1) AU1087795A (en)
CA (1) CA2174528C (en)
DE (1) DE69418617T2 (en)
DK (1) DK0727028T3 (en)
ES (1) ES2132597T3 (en)
FI (1) FI961880A0 (en)
GR (1) GR3030897T3 (en)
SG (1) SG47942A1 (en)
TW (1) TW259861B (en)
WO (1) WO1995012782A1 (en)

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EP0727028A1 (en) 1996-08-21
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WO1995012782A1 (en) 1995-05-11
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US5396350A (en) 1995-03-07
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DK0727028T3 (en) 1999-11-08
EP0727028B1 (en) 1999-05-19

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