Backlight using planar hologram for flat display device
AssigneeSamsung Electronics Co., Ltd.
InventorsMoon-Gyu Lee, Hwan-Young Choi, Jin-Seung Choi, Jee-Hong Min
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Abstract
The backlight for a flat display device including a light source, a light guide plate and a surface hologram is provided. The light guide plate is installed at one side of the light source, and light from the light source travels in the light guide plate while being totally reflected. The surface hologram is formed on at least one surface of the light guide plate. The surface hologram has a pattern of a predetermined grating interval and a predetermined grating depth in order to diffract light at a predetermined angle toward the light guide plate.
Claims18
A backlight for a flat display device comprising:
- a visible light source;
- a light guide plate installed at one side of the light source, in which light from the light source travels while being totally reflected;
- a planar hologram formed on at least one surface of the light guide plate, the planar hologram having a pattern of a predetermined grating interval and a predetermined grating depth in order to diffract light at a predetermined angle toward the light guide plate;
- and
- a light path changing unit installed at one side of the light guide plate, the light path changing unit changing the path of light traveling in the light guide plate to make light incident upon the planar hologram at an angle near the angle providing the maximum diffraction efficiency.
Dependencies are inferred from the claim text.