WO2007081632B1 - Optical apparatus with flipped compound prism structures - Google Patents

Optical apparatus with flipped compound prism structures

Info

Publication number
WO2007081632B1
WO2007081632B1 PCT/US2006/061941 US2006061941W WO2007081632B1 WO 2007081632 B1 WO2007081632 B1 WO 2007081632B1 US 2006061941 W US2006061941 W US 2006061941W WO 2007081632 B1 WO2007081632 B1 WO 2007081632B1
Authority
WO
WIPO (PCT)
Prior art keywords
light
optical apparatus
pluralities
features
major surface
Prior art date
Application number
PCT/US2006/061941
Other languages
French (fr)
Other versions
WO2007081632A1 (en
Inventor
William J Cassarly
Original Assignee
Optical Res Associates
Avery Dennison Corp
William J Cassarly
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 Optical Res Associates, Avery Dennison Corp, William J Cassarly filed Critical Optical Res Associates
Publication of WO2007081632A1 publication Critical patent/WO2007081632A1/en
Publication of WO2007081632B1 publication Critical patent/WO2007081632B1/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
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
    • 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
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide

Abstract

An optical apparatus comprises a light source, an optical member and a spatial light modulator. The optical member comprises optically transmissive material and has a textured major surface receiving light from the light source. The textured surface comprises first and second pluralities of non-intersecting elongate features. The pluralities are angled with respect to each other by less than about 90° and intersect each other so as to form total internal reflection structures. The spatial light modulator has rows or columns of pixels for receiving light from the optical member at a major surface. The light source may be (i) a light guide, or (ii) a source of light providing, to the optical member, light having a peak luminance that is shifted from a normal direction to the textured major surface by more than about 30°.

Claims

AMENDED CLAIMS received by the International Bureau on 26 June 2007 (26.06.07)WHAT IS CLAIMED IS:
1. An optical apparatus comprising: a) a light guide; b) an optical member comprising a body of optically transmissive material and having a textured major surface; the optical member being oriented such that the textured major surface receives light from said light guide and then said light passes through said body; the textured surface comprising first and second pluralities of non-intersecting elongate features; the pluralities being angled with respect to each by less than about 90° and intersecting each other so as to form total internal reflection structures; and c) a spatial light modulator with rows or columns of pixels for receiving light from the optical member at a major surface.
2. The optical apparatus of Claim 1, wherein the pluralities are angled with respect to each by about 60° or less.
3. The optical apparatus of Claim 1 , wherein the pluralities are angled with respect to each other by about 30s or less.
4. The optical apparatus of Claim 1 , wherein the first and second pluralities of non- intersecting elongate features have different pitches.
5. The optical apparatus of Claim 4, wherein the first and second pluralities of non- intersecting elongate features have pitches that are sufficiently different from each other that the textured surface has an appearance that is rotated more than 15 ' from rows or columns of pixels of the spatial light modulator.
6. The optical apparatus of Claim 1 , wherein: a) more than one elongate feature of the first plurality of features each has a cross-sectional shape that varies from an adjacent cross-sectional shape of an adjacent one of another elongate feature of the first plurality of features; and b) the cross-sectional shapes being taken along largest dimension of the associated elongate feature.
7. The optical apparatus of Claim 6, wherein said more than one elongate feature comprises at least 40 percent of the elongate features of the first plurality of features.
AMENDED SHEET (ARTICLE 19)
65
8. The optical apparatus of Claim 6, wherein said first-mentioned cross-sectional shape varies from the second-mentioned cross-sectional shape in pitch or height.
9. The optical apparatus of Claim 6, wherein: a) more than one elongate feature of the second plurality of features each has a cross-sectional shape that varies from an adjacent cross-sectional shape of an adjacent one of another elongate feature of the second plurality of features; and b) the cross-sectional shapes being taken along largest dimension of the associated elongate feature.
10. The optical apparatus of Claim 5, wherein; a) the first and second pluralities of non-intersecting elongate features are angled at plus and minus about 5° from the direction of the rows or columns of pixels of the spatial light modulator; and b) the pitches of said first and second pluralities are respectively about 31 and about 41 μm, respectively.
11. The optical apparatus of Claim 1, further comprising a dlffuser situated between the optical member and the spatial light modulator; the diffuser being combined with the optical member.
12. The optical apparatus of Claim 11, wherein the diffuser asymmetrically scatters light passing therethrough.
13. The optical apparatus of Claim 1, wherein the πoπ-intersectiπg elongate features comprise non-linear features.
14. The optical apparatus of Claim 13, wherein the non-linear features undulate across said textured major surface of the optical member.
15. The optical apparatus of Claim 13, wherein the non-linear features undulate In a direction normal to said textured major surface of the optical member.
16. The optical apparatus of Claim 1, wherein said pluralities intersect each other only once.
17. The optical apparatus of Claim 1 , wherein;
AMENDED SHEET (ARTICLE 19)
66 a) the first and second pluralities of features have peak sections facing the light guide; and b) the peak sections being flattened and wetted to the light guide.
18. The optical apparatus of Claim 1, wherein: a) the light guide has an array of extractors to extract light from the light guide; said array comprising a plurality of rows or columns of extractors; and b) said first and second pluralities of features being angled with respect to the rows or columns of extractors.
19. The optical apparatus of Claim 1, wherein the textured surface comprises more than two pluralities of non-intersecting elongate features; said pluralities being angled with respect to each other and intersecting each other so as to form total Internal reflection structures.
20. An optical apparatus comprising: a) a source of light; b) an optical member comprising a body of optically transmissive material and having a textured major surface; the optical member being oriented such that the textured major surface receives light from said source of light and then said light passes through said body; the textured surface comprising first and second pluralities of non-intersecting elongate features; said pluralities being angled with respect to each other by less than 90° and Intersecting each other so as to form total Internal reflection structures; and c) a spatial light modulator with rows or columns of pixels for receiving light from the optical member at a major surface; and d) said source of light providing, to said optical member, light having a peak luminance that is shifted from a normal direction to said textured major surface by more than about 30°.
21. The optical apparatus of Claim 20, wherein said source of light comprises: a) a light emitter; and b) a light guide with rows or columns of extractors of light, for receiving light from the light emitter.
AMENDED SHEET (ARTICLE 19)
67
22. The optical apparatus of Claim 20, wherein the pluralities are angled with respect to each by about 60° or less.
23. The optical apparatus of Claim 20, wherein the pluralities are angled with respect to each other by about 30° or less.
AMENDED SHEET (ARTICLE 19)
68
PCT/US2006/061941 2006-01-13 2006-12-12 Optical apparatus with flipped compound prism structures WO2007081632A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US75908606P 2006-01-13 2006-01-13
US60/759,086 2006-01-13
US11/594,434 2006-11-08
US11/594,434 US7545569B2 (en) 2006-01-13 2006-11-08 Optical apparatus with flipped compound prism structures

Publications (2)

Publication Number Publication Date
WO2007081632A1 WO2007081632A1 (en) 2007-07-19
WO2007081632B1 true WO2007081632B1 (en) 2007-09-07

Family

ID=37742283

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/061941 WO2007081632A1 (en) 2006-01-13 2006-12-12 Optical apparatus with flipped compound prism structures

Country Status (2)

Country Link
US (1) US7545569B2 (en)
WO (1) WO2007081632A1 (en)

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