DIFFUSER PLATE

摘要

PURPOSE: A diffusing plate with a pattern is provided to improve the uniformity of light and the brightness by periodically and iteratively forming a region including different patterns. CONSTITUTION: A diffusing plate is formed on a lighting source part including a plurality of lamps(30). A region(20) including at least two patterns which are different with each other in a one side or both sides is periodically and iteratively formed. The region includes a first pattern(21) and a second pattern(22). A b is same with or greater than a/6 and same with or less than 2a/3. The a is distance between the centers of adjacent lamps. The b is iterative period of the region including different patterns. The first pattern is 1/3b~2/3b.