Light Guiding Plate for Surface Light Source Device and Back Light Unit using the Same

摘要

PURPOSE: A light guide plate for a surface light source device and a back light unit using the same are provided to enhance front brightness and improve the regularity of brightness. CONSTITUTION: A light guide plate(100) for a surface light source device comprises an incidence surface(120), an emitting surface(130), and a back side(140). Lights are incident from a lamp arranged along a predetermined axis to the incidence surface. The emitting surface emits the incident lights. The back side is faced to the emitting surface. A plurality of unit cells(160) having micro prism patterns is dispersedly arranged in the back side. A prism arranging axis(151) in which a ridge direction of the micro prism patterns constitutes and a lamp arranging axis(111) in which an arrangement direction of the lamp constitutes make an alternate angle.