ILLUMINATION DEVICE WITH HOLOGRAPHIC LIGHT GUIDE
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United States of America Patent
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Issued Date -
Dec 31, 2009
app pub date -
Oct 14, 2008
filing date -
Jun 30, 2008
priority date (Note) -
Abandoned
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Abstract
An illumination device includes a holographic film and a light source, such as a point light source. The point light source is positioned at an edge of the holographic film and has a light emitting face that faces the edge of the holographic film. The holographic film includes a hologram formed of diffractive refractive index structures. The density of the diffractive refractive index structures increases with increasing distance from the light source. Light is propagated from the light source through the holographic film, such as by total internal reflection. The diffractive refractive index structures turn the light, thereby causing the light to propagate out of the holographic film in a desired direction. In some embodiments, the light propagating out of the holographic film has a high uniformity across the surface of the holographic film.
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