Patent ID: 8042963

Claim:
An optical member comprising: a base body having a first surface and a second surface opposite to the first surface, the second surface receiving light from a plurality of light sources; a plurality of light-concentrating lenses formed on the first surface at a predetermined pitch; and a plurality of light-diffusing patterns respectively formed at positions of the second surface respectively corresponding to the light sources to reduce an amount of light reflected by the light-concentrating lenses, each of the light-diffusing patterns including curved surfaces extending in a first direction and having a width which is in a range determined by the following inequality H ×tan {90°− a −cos −1 (1/ n )}< D<H ×tan {90°−3 a +cos −1 (1/ n )}, in which ‘H’ is a distance between the light sources and the second surface, ‘a’ is an angle between an external surface of one of the light-concentrating lenses and the first surface, ‘n’ is a refractive index of the light-concentrating lenses, and ‘D’ is the width of each light-diffusing pattern.