Illumination apparatus for display device using hologram-based light guide plate (LGP)
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United States of America Patent
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Dec 28, 2010
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N/A
app pub date -
Dec 14, 2005
filing date -
Dec 14, 2004
priority date (Note) -
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Abstract
An illumination apparatus and method for a display device designed such that light is incident on a hologram or hologram pattern at an angle for which diffraction efficiency is the highest. The illumination apparatus includes at least one point light source which emits light and a light guide plate (LGP) which has the at least one point light source disposed on a side thereof and a hologram pattern on a top surface which permits the light incident from the point light source to exit from the top surface. The side of the LGP facing the point light source is inclined such that the light is incident obliquely on the hologram pattern at an altitude angle which provides high diffraction efficiency.
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