Patent ID: 7350958
Filing Date: 2008-04-01
Classification: G02B,Y10S

Abstract:
1. A planar light guide plate for a backlight unit having an LED light source, comprising: a pair of wide planes facing each other; and a narrow plane formed between the pair of wide planes and constituting a thickness of the light guide plate, wherein the narrow plane has an incident plane constituted on a section of the narrow plane facing the LED light source, the incident plane having a plurality of elliptic cylinder-shaped grooves carved into the incident plane in a thickness direction of the light guide plate, and one of the wide planes constitutes an exiting plane from which light entered from the LED light source exits, wherein the carved elliptic cylinder-shaped grooves extend in a thickness direction of the exiting plane of the light guide plate such that ellipses corresponding to the respective elliptic cylinder-shaped grooves are partially overlapped with each other.