Patent ID: 7787076
Filing Date: 2010-08-31
Classification: G02B,G02F

Abstract:
1. A liquid crystal display backlight unit wherein said unit comprises: a light source having a shape with a longitudinal direction and disposed on a back side and on an outside of a side of the liquid crystal panel having a rectangular plate shape, with said longitudinal direction along said side; and a reflector reflecting light, radiated from a periphery of said light source, so as to be incident on a back surface of the liquid crystal panel; wherein said reflector includes: a main reflecting surface portion facing the back surface of the liquid crystal panel; and a light source back-side reflecting surface portion facing at least a region, not facing the back surface of the liquid crystal panel, of the periphery of said light source; wherein said light source back-side reflecting surface portion of said reflector comprises, as a shape in a cross-section perpendicular to said longitudinal direction of said light source, a mountain-shaped portion defined by two inclined concave surfaces and projecting toward said light source, wherein said light source, as a shape in a cross-section perpendicular to said longitudinal direction, has an oblong circular shape or an elliptic shape and is disposed so that a major-axis direction of the oblong circle or the ellipse forms an angle of 90 degrees or less with respect to a line segment connecting a center of the oblong circle or the ellipse and a center of the liquid crystal panel in a direction perpendicular to said side thereof.