US Patent No: 6,773,126
Number of patents in Portfolio can not be more than 2000
Light panel with improved diffraction
Stats
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Aug 10, 2004
Issued date -
Nov 27, 2001
filing date -
09/979,944
serial no -
In Force
status
Importance
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Abstract
A light panel that includes a light source and a panel element operatively connected to the light source. The panel element includes a substantially transparent light transmitting material and is operative as a waveguide panel inside which light beams received from the light source propagate with total reflection. A diffractive outcoupling system is arranged on the panel element over a light surface of the panel element and is operative to outcouple the light beams from inside the panel element. The diffractive outcoupling system includes a plurality of local grating elements. The local grating elements have a plurality configurations and are optimized such that a diffraction efficiency is a function of location.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,428,912 Indirectly illuminated sign | 43 | 1993 | |
| 5,542,201 Indirectly illuminated sign | 14 | 1995 | |
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| 6,011,602 Lighting apparatus with a light guiding body having projections in the shape of a trapezoid | 113 | 1997 | |
| 6,247,826 Illumination device and bulletin board device | 24 | 1998 | |
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| 5,703,667 Light guide plates and light guide plate assembly utilizing diffraction grating | 73 | 1996 | |
| 6,196,691 Light guide plate for point source | 73 | 1999 | |
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| 6,396,409 Status indicating device of a portable computer | 5 | 2001 | |
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| 5,481,440 Circuit pack with light pipes | 25 | 1993 | |
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| 5,506,929 Light expanding system for producing a linear or planar light beam from a point-like light source | 104 | 1994 | |
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| 5,748,106 Method and apparatus for controlling transponder signaling | 38 | 1996 | |
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| 5,892,599 Miniature fingerprint sensor using a trapezoidal prism and a holographic optical element | 42 | 1996 | |
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| 5,299,109 LED exit light fixture | 38 | 1992 | |
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| 5,105,568 Illuminated sign having stencil panel and reflector panel | 27 | 1991 | |
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| 5,742,433 Diffractive optical device including grating elements with different grating periods and duty ratios | 57 | 1996 | |
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| 5,761,540 Illumination device with microlouver for illuminating an object with continuous diffuse light | 23 | 1997 | |
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| 6,199,995 Light guide plate, planer light source unit and reflection-type liquid-crystal display device | 25 | 1999 | |
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| 6,151,166 Color separation element and image display device using same | 29 | 1998 | |
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| 6,036,328 Plane-shaped lighting device and a display using such a device | 35 | 1998 | |
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| 5,122,890 Electro-optic animated displays and indicators employing electro-optical cells and mosaic segment polarizer | 24 | 1990 | |
| 6,144,480 Optical arrangement for processing an optical wave | 34 | 1999 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 10, 2016 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |