Patent ID: 7616269
Filing Date: 2009-11-10
Classification: G02F

Abstract:
1. An illumination apparatus for a display device comprising: a housing; a light source disposed inside the housing; and an optical sheet that has a plurality of corner portions and that is housed inside the housing in a condition in which a circumference of the optical sheet is surrounded by a wall portion of the housing such that the optical sheet receives light from the light source inside the housing; wherein a tip of at least one of the corner portions of the optical sheet has a shape in which the tip has been trimmed by a line segment extending between two edges that define the corner portion, at the wall portion of the housing an opposing surface is disposed along the line segment of the corner portion so as to correspond to the shape of the corner portion at which the tip has been trimmed, and when the optical sheet is housed in the housing in a state in which a top surface and a bottom surface thereof are inverted, one of other corner portions thereof is disposed at an area at which the opposing surface of the housing is provided and comes to a standstill on the opposing surface.