Patent ID: 8297824

Claim:
A tabular light guide plate which receives incident light from a side, unifies the levels of the received incident light, and emits uniform light from a plane of the light guide plate, the light guide plate comprising: an incident surface formed on one side of the tabular light guide plate for receiving the incident light; a light emitting plane formed on one plane along an upper surface of the tabular light guide plate for emitting the uniform light; a light deflecting region formed at a portion of the tabular light guide plate corresponding to the light emitting plane; and a light flux unifying region formed at a portion of the tabular light guide plate between the incident surface and the light deflecting region, wherein the light flux unifying region guides the incident light towards the light deflecting region, and wherein the light flux unifying region has one plane thereof formed with a plurality of parallel grooves forming a zigzag surface, the plurality of parallel grooves (i) being formed along a lower surface of the tabular light guide plate and (ii) extending vertically from the incident surface.