Surface light source apparatus and display apparatus using same

摘要

A surface light source apparatus capable of keeping a high in-plane brightness uniformity and a high light utilization efficiency without increasing the size of a frame, and also to provide a display apparatus including the surface light source apparatus. The surface light source apparatus includes a point light source, and a light guide plate having a hole formed near first side surface that is one side surface thereof, the hole being formed at a position where the point light source is to be arranged. The first side surface of the light guide plate has, in a portion thereof near the hole, a prism having a saw-toothed shape in a cross-section thereof parallel to a front surface of the light guide plate.

主权项

1. A surface light source apparatus comprising:
a point light source; and a light guide plate having a hole formed near one side surface thereof, said hole being formed at a position where said point light source is to be arranged, wherein said one side surface of said light guide plate has, in a portion thereof near said hole, a prism having a saw-toothed shape in a cross-section thereof parallel to a front surface of said light guide plate; a wall surface of the light guide plate that defines a side surface of the hole has a first protrusion protruding toward a center of the hole; the first protrusion is disposed at a portion of the side surface of the hole that is closest to the one side surface; said first protrusion is a convex lens having a focal point thereof positioned at a center of light emission of said point light source; and a conic constant K of a curved surface of said convex lens satisfies −1