| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device for a liquid crystal dsiplay device having high light transmittance, low power consumption and uniform luminance distribution and achieving high optical design efficiency and a low price, and to provide an optical device. <P>SOLUTION: Parallel light collimated by an off-axis parabolic mirror 10 is reflected by a cylindrical convex total reflection surface 5 disposed in a rice terrace shape to expand a luminous flux in a width of a liquid crystal sub pixel and luminous flux density made incident on a liquid crystal is made uniform by increasing reflection surface step differences of the cylindrical convex surface in inverse proportion to the luminous flux density. With a basic unit in which a light quantity of 1/3 of emission light of a rice terrace-shaped light guide plate 1 is transmitted through a sub pixel existing in a perpendicular direction of an incident part and in which a light quantity of 2/3 of one is reflected by a reflection surface 7 inclined in a stripe direction, reflected by a liquid crystal facing side reflection surface 8 in a stripe distributing element 2 and made incident on two liquid crystal sub pixels, the emission light quantity is distributed to three sub pixels in the same stripe. Distribution to separated positions is made possible by a reflection system of a transmission/reflection separation part and color display is made possible without using color filters by adopting a plurality of color light sources. <P>COPYRIGHT: (C)2009,JPO&INPIT |
