Patent ID: 7465084
Filing Date: 2008-12-16
Classification: G02B

Abstract:
1. A light guiding plate comprising: a light reflecting surface provided by a first main surface of the light guiding plate; a light emitting surface provided by a second main surface of the light guiding plate; a light incident surface provided by a side surface of the light guiding plate; wherein a Z axis direction is defined as a direction orthogonal to said first and second main surfaces, an X axis direction is defined as a direction orthogonal to said light incident surface, and a Y axis direction is defined as a direction orthogonal to said z-axis direction and said x-axis direction; and wherein said light reflecting surface includes a plurality of prisms formed along the x-axis direction of the light reflecting surface and projecting both inwardly towards the light emitting surface and outwardly away from said light emitting surface, a lengthwise direction of the prisms being formed in the y-axis direction, said cross-sectional shape of said prisms includes an inwardly extending triangle and an outwardly extending triangle, such that said inwardly extending triangle and said outwardly extending triangle share an edge that extends substantially orthogonal to the light reflecting surface, and wherein the prisms are comprised of a light-transmitting medium that allows a portion of a light incident on one part of a prism to travel through the prism and exit at another part of the prism.