Display Device Refractive Layers for Lower External Reflectance

The light control member is segmented into multiple functional layers including an inorganic layer, first light control layer, second light control layer, and color filter layer. Each layer performs a specific function: the inorganic layer provides refractive index matching, the light control layers manage light transmission and reflection, and the color filter layer enhances color accuracy. This segmentation allows the system to reduce external light reflectance effectively while maintaining manageable complexity through functional specialization.

The patent employs composite material structures where an inorganic layer is combined with organic light control layers and color filter materials. The inorganic layer provides specific refractive index properties (first refractive index greater than second refractive index of light control layers), while the organic layers provide light control functionality. This composite approach enables simultaneous achievement of reflectance reduction and light conversion efficiency without excessive complexity.

The patent specifies precise refractive index parameters for different layers: the inorganic layer has a first refractive index greater than the second refractive index of the light control layers, and the third refractive index of the color filter layer is greater than the second refractive index. These parameter specifications enable optimized light conversion efficiency through refractive index matching. The patent also specifies thickness parameters (inorganic layer: 2.5-3.5 kÅ, second light control layer: 0.5-3.5 kÅ) to achieve desired optical performance while providing manufacturable tolerance ranges.

The inorganic layer serves as an intermediary between the wavelength control layer and the light control layers. Its refractive index is specifically designed to be greater than that of the light control layers, creating a gradient that facilitates smooth light transition and reduces reflection losses. This intermediary structure simplifies manufacturing by providing a clear functional boundary and reference for aligning subsequent layers.

The patent optimizes the inorganic layer thickness to a specific range of 2.5-3.5 kÅ (250-350 nm). This parameter optimization achieves the right balance: it is thick enough to provide effective refractive index matching and reduce external light reflectance, but not so thick as to significantly attenuate the light signal. The precise thickness control enables the layer to function as an anti-reflective coating while maintaining high light transmittance for the display function.

The patent employs a proven anti-reflective coating structure where the inorganic layer replicates the functional characteristics of single-layer anti-reflective coatings but with enhanced performance through the refractive index gradient. By copying and adapting established anti-reflective principles to this multi-layer configuration, the patent achieves reflectance reduction without the need for excessive layer thickness that would compromise light transmittance.