Anti-Reflection Layer Gradient Structure for Display Devices

The anti-reflection layer is divided into three distinct inorganic sub-layers (first, second, and third sub-layers) with different refractive indices, arranged in a gradient structure. This segmentation allows each layer to contribute differently to the overall anti-reflection performance, achieving superior reflectance reduction compared to single-layer coatings while maintaining a manageable manufacturing process.

The patent employs a composite structure combining multiple inorganic materials with different refractive indices (such as silicon oxide, silicon nitride, and magnesium fluoride) in a layered configuration. This composite approach enables optimization of the anti-reflection properties by selecting materials with specific refractive indices for each sub-layer, creating a gradient that effectively minimizes external light reflectance across the visible spectrum.

The patent optimizes the refractive index parameter by selecting specific materials for each sub-layer (first sub-layer with lower refractive index, second sub-layer with intermediate refractive index, third sub-layer with higher refractive index). This parameter optimization allows the anti-reflection coating to achieve effective reflectance reduction with more relaxed thickness tolerance compared to designs requiring extreme precision.

The patent specifies thickness ranges for each sub-layer that may be slightly excessive or optimized for ease of manufacturing rather than theoretical minimum requirements. This approach ensures that even with normal manufacturing variations, the anti-reflection performance remains effective, reducing the need for ultra-precise thickness control.