Patent ID: 8256932
Filing Date: 2012-09-04
Classification: F21V

Abstract:
1. A light diffusion plate comprising: a main body, and a plurality of diffusion particles dispersed in the main body, the main body comprising: a first surface, the first surface having a flat surface; and a second surface opposite to the first surface of the main body, the second surface defining a plurality of rectangular structures and a plurality of quadrilateral pyramid depressions, each rectangular structure defining four adjacent triangular pyramid depressions, each side of the rectangular structures borders one side of one quadrilateral pyramid depression; wherein each rectangular structure takes up a substantially same area projected on the second surface as each quadrilateral pyramid depression, each triangular pyramid depression of the rectangular structure comprises three triangular surfaces; each quadrilateral pyramid depression comprises four triangular surfaces; the four triangular pyramid depressions of each rectangular structure are closely connected and together with sidewalls thereof cooperatively form a four-pointed star having sixteen edges; each rectangular structure is surrounded by four quadrilateral pyramid depressions, and each quadrilateral pyramid depression is surrounded by four rectangular structures; wherein corners of each of the plurality of the rectangular structures borders with four other of the plurality of the rectangular structures at the corners; sidewalls on each side of adjacent triangular pyramid depressions share a same edge, the same edges of the four triangular pyramid depressions of each rectangular structure collectively form vertices of a first V-shaped ridge aligned in a first direction, a second V-shaped ridge aligned in a second direction, a third V-shaped ridge aligned in a third direction, and a fourth V-shaped ridge aligned in a fourth direction, and each triangular pyramidal depression is defined by three of the four V-shaped ridges aligned in four different directions; each side of the rectangular structure is about the same length and that each side of the rectangular structure is about the same length as a side of the quadrilateral pyramid depression.