Backlight unit for flat panel display and flat panel display apparatus having the same

摘要

Provided are a backlight unit (100) for a flat panel display (500) and a flat panel display apparatus having the same. The backlight unit (100) for a flat panel display (500) displaying a predetermined image includes: a light source (151) emitting light; a light guide panel (120) having an incident surface (121) facing the light source (151) and an exit surface (120a), wherein light incident through the incident surface (121) propagates by total internal reflection and exits through the exit surface (120a) for irradiating on the flat panel display (500); and a holographic pattern (125) that includes a plurality of diffraction gratings that are continuously repeated on at least one of the exit surface (120a) of the light guide panel (120) and the opposing surface (120b) and diffracts light propagating through the light guide panel (120). A depth of the diffraction grating progressively increases away from the incident surface (121) along a length direction of the light guide panel (120). The backlight unit (100) for a flat panel display (500) and the flat panel display apparatus having the same has a simple structure that can acquire surface light using a holographic pattern (125) while achieving uniform brightness distribution across the entire light-emitting surface.