Patent ID: 8236433
Filing Date: 2012-08-07
Classification: C23C,G02B,Y10T

Abstract:
1. An antireflection structure, comprising: a substrate layer having a substrate refractive index; a first inorganic layer disposed on the substrate layer and having a first refractive index different from the substrate refractive index, wherein a thickness of the first inorganic layer is in a range of 1 to 40 nm; a second inorganic layer disposed on the first inorganic layer and having a second refractive index smaller than the first refractive index; a third inorganic layer disposed on the second inorganic layer, wherein the thickness of the third inorganic layer is in a range of 1 to 40 nm; and a fourth inorganic layer disposed directly on the third inorganic layer, wherein the first and the third inorganic layers consist of a first material, and the second and the fourth inorganic layers consist of a second material different from the first material.