Backlight unit and image display apparatus having the same

摘要

A backlight unit (50,50'') includes a light guiding plate (70); a light source module (80) that is disposed in at least one side of the light guiding plate and includes a plurality of light sources (81) emitting light toward a side surface (71) of the light guiding plate; an under chassis (60) supporting the light guiding plate and the light source module; and a gap maintaining unit (90;94,95,96) maintaining a gap of a constant width between the side surface of the light guiding plate and the plurality of light sources of the light source module when a length of the light guiding plate is changed.