Coherent backlight unit and three-dimensional image display device including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsYunhee KIM, Hoon SONG, Sunil KIM, Seokho SONG
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Abstract
A coherent backlight unit and a 3D image display device including the coherent backlight unit are provided. The coherent backlight unit includes a light source, a light guide plate, a first diffraction grating, a second diffraction grating, and a reflective optical element. The light source irradiates a coherent light and the reflective optical element reflects the coherent light that is propagating toward one of the side surfaces from the inner side of the light guide plate toward the inner side of the light guide plate.
Claims20
A coherent backlight apparatus comprising:
- a light source configured to irradiate a coherent light;
- a light guide plate that has a flat panel shape, the light guide plate comprising a first flat panel surface and a second flat panel surface;
- a first diffraction grating provided on one from among the first flat panel surface and the second flat panel surface and configured to diffract the coherent light irradiated from the light source toward an inner side of the light guide plate;
- a reflective optical element provided on at least one from among a plurality of side surfaces of the light guide plate and configured to reflect the coherent light that propagates toward the at least one from among the plurality of side surfaces from the inner side of the light guide plate toward the inner side of the light guide plate;
- and
- a second diffraction grating provided on the first flat panel surface and configured to discharge the coherent light that is totally reflected by the light guide plate to an outside of the light guide plate.
A coherent backlight apparatus comprising:
- a light source configured to irradiate a coherent light;
- a light guide plate that has a flat panel shape;
- a first diffraction grating provided on a flat panel surface of the light guide plate and configured to diffract the coherent light irradiated from the light source toward an inner side of the light guide plate;
- a second diffraction grating provided on a flat panel surface of the light guide plate and configured to discharge the coherent light that is totally reflected by the light guide plate to an outside;
- and
- a retro-reflective surface provided at least on one from among a plurality of side surfaces of the light guide plate and configured to form a single optical path for the coherent light that is totally reflected by the light guide plate.
Dependencies are inferred from the claim text.