Display Device With Blue-to-Yellow Conversion for High-Luminance White Light

The patent introduces a yellow-wavelength conversion layer as an intermediary component that converts blue light to yellow light. This layer acts as a mediator between the blue light source and the final white light output, enabling high-luminance yellow light emission without relying on direct yellow electroluminescence materials. The wavelength conversion layer includes a yellow phosphor that converts a portion of blue light to yellow light, solving the limitation of insufficient yellow light luminance in conventional OLED and QLED structures.

The patent segments the light-emitting structure into distinct functional layers: a blue light-emitting layer and a separate yellow-wavelength conversion layer. This segmentation allows each layer to be optimized independently - the blue light-emitting layer focuses on generating high-luminance blue light, while the yellow-wavelength conversion layer focuses on converting blue light to yellow light with high efficiency. The segmented structure resolves the contradiction by enabling high white light luminance through the combination of blue and yellow light while maintaining manageable device complexity through functional separation.

The patent replaces the direct electroluminescence mechanism for yellow light generation with a photoluminescence-based wavelength conversion mechanism. Instead of using yellow electroluminescence materials that require complex fabrication processes and yield insufficient luminance, the invention uses a yellow phosphor in a wavelength conversion layer that converts blue light to yellow light. This substitution of the light generation mechanism simplifies manufacturing while achieving high yellow light luminance, as the yellow phosphor can be incorporated using conventional phosphor deposition techniques.