HOLOGRAPHIC LIGHT GUIDE PLATE

A holographic light guide plate is disclosed, and comprises: a light guide unit for guiding light; a first holographic optical element arranged on one surface or an opposite surface of the light guide unit so that light output from a light source can be input and guided onto the light guide unit, to thereby diffract the input light; a second holographic optical element arranged on one of the one surface and the opposite surface of the light guide unit to receive light guided through the light guide unit by being diffracted from the first holographic optical element, and to partially diffract the received light so that the received light is directed to the other of the one surface and the opposite surface of the light guide unit; a third holographic optical element arranged on a surface opposite to a surface on which the second holographic optical element of the light guide portion is arranged to receive light diffracted from the second holographic optical element and to guide, by diffraction, the received lig