Patent ID: 8416363
Filing Date: 2013-04-09
Classification: G02B

Abstract:
1. A liquid crystal display backlight device, comprising: a laser light source that emits laser light; and a light guiding unit that transforms the laser light from the laser light source into a linear laser light by substantially vertical reflection, and transforms the linear laser light into a planar laser light, and emits the planar laser light, wherein the laser light enters into the light guiding unit as substantially parallel light, the light guiding unit includes a light guiding plate that has a planar reflection surface for transforming the linear laser light into the planar laser light by reflecting substantially vertically the linear laser light by a plurality of reflection surfaces that are formed along an entrance direction of the linear laser light, and the planar reflection surface includes a triangular prism array or trapezoidal prism array, and a sequence of points connecting at least one vertex of vertexes of each triangular prism or each trapezoidal prism of the triangular prism array or the trapezoidal prism array is expressed by a polynomial of degree 2 or more.