Patent ID: 7663713
Filing Date: 2010-02-16
Classification: G02B,Y10S

Abstract:
1. A liquid crystal display device comprising: a liquid crystal panel; and an illumination device which is arranged on a back surface of said liquid crystal panel; wherein said illumination device includes a light guide plate and a plurality of spot light sources on at least one side surface of said light guide plate; wherein said light guide plate includes a large number of upper-surface arcuate cross-sectional grooves in the direction orthogonal to said one side surface on an upper surface thereof which faces said liquid crystal panel; wherein a large number of light-incident-surface arcuate cross-sectional grooves are formed in the thickness direction of said light guide plate on at least a portion of said one side surface which faces a position at which said plurality of spot light sources are arranged; and wherein a relationship between a contact angle Oa of the upper-surface arcuate cross-sectional grooves and a contact angle Ea of the light-incident-surface arcuate cross-sectional grooves is set as