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An anti-reflective coating is an optical thin film used to reduce light reflection at interfaces and enhance light transmittance, effectively improving image quality and overall optical efficiency. The principle is based on destructive interference of light, which reduces reflection loss caused by differences in refractive index, thereby enhancing visual comfort.
Depending on the structure, it can be classified into single-layer and multi-layer coatings: single-layer coatings are mainly optimized for a specific wavelength or narrow spectral band; multi-layer coatings can cover a broader spectral range and can be adjusted for specific angles of incidence to enhance performance. Common materials include SiO₂, TiO₂, and Si₃N₄, which offer stable refractive indices and good environmental durability, and can be combined as needed.
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