LED flat lighting

摘要

PURPOSE: An LED flat light having a light guide plate which is unnecessary for a diffusing plate is provided to maximize illumination efficiency by manufacturing a light guide plate having a cylindrical shaped groove. CONSTITUTION: An LED flat light comprises a light guide plate(10), an LED light source(20) irradiating light to the light guide plate, and a reflective sheet(30). A plurality of cylindrical grooves is formed on a rear surface or light discharging surface of the light guide plate. The plurality of cylindrical grooves is composed of a vertical cylinder shaped groove(13) which is gradually arranged more densely as getting far away from an LED light source. The plurality of the cylindrical grooves includes a horizontal cylinder shaped groove(15) which is parallel to light radiated from the LED light source. The vertical cylinder shaped groove is densely arranged.