Light guide for use with backlit display
First Claim
1. A light guide comprising:
- a light guide body including a light re-directing side positioned opposite from a light output side, the light guide body also including a light input side that extends between the light re-directing side and the light output side and a distal side positioned opposite from the light input side;
a plurality of elongate prisms located adjacent the light output side of the light guide body, the prisms extending side-by-side relative to one another along lengths, the prisms including upper edges defining heights of the prisms, the upper edges extending along the lengths of the prisms, and each upper edge including a plurality of edge segments having different magnitudes of slope;
a plurality of generally flat first surfaces located adjacent the light redirecting side of the light guide body for directing light through the light guide body by total internal reflection, the generally flat first surfaces being positioned at different heights with the generally flat first surfaces being positioned progressively higher as one moves in a direction from the light input side of the light guide body toward the distal side of the light guide body; and
extractor facets located adjacent the light re-directing side of the light guide body for reflecting light toward the light output side of the light guide body, the extractor facets being aligned at oblique angles relative to the generally flat first surfaces, and the extractor facets providing at least portions of the height differences between the generally flat first surfaces.
1 Assignment
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Accused Products
Abstract
A light guide including a light guide body having a light re-directing side positioned opposite from a light output side. A plurality of elongate prisms are located adjacent the light output side of the light guide body. The prisms extend side-by-side relative to one another along lengths. The prisms include upper edges defining heights of the prisms. The upper edges extend along the lengths of the prisms. Each upper edge includes a plurality of edge segments having different magnitudes of slope. The light guide also includes a plurality of light extraction structures located adjacent the light re-directing side of the light guide body for reflecting light toward the light output side. The light extraction structures include elongated projections each having a plateau segment and first and second facets. The elongated projections are separated by lands that are recessed relative to the plateau segments. The first and second facets extend from the plateau segments to the lands.
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Citations
38 Claims
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1. A light guide comprising:
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a light guide body including a light re-directing side positioned opposite from a light output side, the light guide body also including a light input side that extends between the light re-directing side and the light output side and a distal side positioned opposite from the light input side;
a plurality of elongate prisms located adjacent the light output side of the light guide body, the prisms extending side-by-side relative to one another along lengths, the prisms including upper edges defining heights of the prisms, the upper edges extending along the lengths of the prisms, and each upper edge including a plurality of edge segments having different magnitudes of slope;
a plurality of generally flat first surfaces located adjacent the light redirecting side of the light guide body for directing light through the light guide body by total internal reflection, the generally flat first surfaces being positioned at different heights with the generally flat first surfaces being positioned progressively higher as one moves in a direction from the light input side of the light guide body toward the distal side of the light guide body; and
extractor facets located adjacent the light re-directing side of the light guide body for reflecting light toward the light output side of the light guide body, the extractor facets being aligned at oblique angles relative to the generally flat first surfaces, and the extractor facets providing at least portions of the height differences between the generally flat first surfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A light guide comprising:
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a wedge-shaped light guide body that narrows in thickness from a first end to a second end, the light guide body including a light re-directing side positioned opposite from a light output side, the light re-directing side and the light output side extending between the first and second ends, the light guide body further including a light input surface located at the first end, the light input surface extending between the light redirecting side and the light output side;
a plurality of elongate prisms integral with the light output side of the light guide body, the prisms extending side-by-side relative to one another along lengths, the prisms including upper edges defining heights of the prisms, the upper edges extending along the lengths of the prisms, each upper edge including a plurality of edge segments having different magnitudes of slope, the magnitudes of slope varying randomly from edge segment to edge segment; and
a plurality of light extraction structures integral with the light re-directing side of the light guide body for reflecting light toward the light output side, the light extraction structures including elongated projections each having a plateau segment and first and second facets, the elongated projections being separated by lands that are recessed relative to the plateau segments, the first and second facets extending from the plateau segments to the lands.
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26. A display comprising:
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a light source;
a light gating device;
a light guide for directing light from the light source to the light gating device, the light guide including;
a light guide body including a light re-directing side positioned opposite from a light output side, the light guide body also including a light input side that extends between the light re-directing side and the light output side and a distal side positioned opposite from the light input side;
a plurality of elongate prisms located adjacent the light output side of the light guide body, the prisms extending side-by-side relative to one another along lengths, the prisms including upper edges defining heights of the prisms, the upper edges extending along the lengths of the prisms, and each upper edge including a plurality of edge segments having different magnitudes of slope;
a plurality of generally flat first surfaces located adjacent the light redirecting side of the light guide body for directing light through the light guide body by total internal reflection, the generally flat first surfaces being positioned at different heights with the generally flat first surfaces being positioned progressively higher as one moves in a direction from the light input side of the light guide body toward the distal side of the light guide body; and
facets located adjacent the light re-directing side of the light guide body for reflecting light toward the light output side of the light guide body, the facets being aligned at oblique angles relative to the generally flat first surfaces, and the facets providing at least portions of the height differences between the generally flat first surfaces. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification