| 摘要 |
PURPOSE: A LED lamp saving type diffuser plate is provided to improve brightness and uniformity with the less number of LED lamps than existing LED lamps. CONSTITUTION: A base material layer(120) has a light receiving surface for receiving light. A pattern layer(110) having multiple quadrangular pyramid shapes is formed in one surface of the base material layer. The multiple quadrangular pyramid shapes are closely arranged. The quadrangular pyramid shape has a bottom surface having a square shape of which one side is 30-300 micro meters in length and a side surface having a regular triangle shape. An apex angle of the quadrangular pyramid shape is rounded to have the radius of curvature. The distribution of a brightness value in a diffuser plate is 2A=B and 2A'=B. |
