Display Device Inorganic Layer Refractive Index Gradient

The patent divides the inorganic layer into multiple sub-layers (first inorganic layer, second inorganic layer, third inorganic layer) with different refractive indices. This segmentation allows each layer to contribute differently to reducing external light reflectance while maintaining display quality. The first inorganic layer has a first refractive index, the second has a second refractive index less than the first, and the third has a third refractive index less than the second but greater than the organic layer, creating a gradient that progressively reduces reflection.

The patent changes the refractive index parameter across multiple inorganic layers to optimize light reflection characteristics. By systematically varying the refractive index from the first inorganic layer to the second and third layers, the display device reduces external light reflectance while maintaining internal light transmission efficiency, thereby improving visibility without sacrificing display quality.

The inorganic layer is segmented into three functional sub-layers, each with specific refractive index characteristics. This segmentation approach manages complexity by dividing a single complex function (reflectance reduction) into multiple simpler layers with defined roles, making the overall structure more manageable while achieving superior performance.

The patent employs a composite structure combining inorganic layers with different refractive indices and an organic layer with specific optical properties. The inorganic layers provide refractive index gradient for reflection control, while the organic layer with refractive index less than the second inorganic layer provides additional optical management, creating a composite system that achieves reflectance reduction through material combination rather than structural complexity alone.