OLED Substrate Doping for Crosstalk Reduction

The patent applies local quality by doping impurities (such as fluorine, chlorine, or oxygen) selectively in the inter-subpixel regions of the hole transport layer and hole injection layer. This creates localized regions with modified electrical properties - the doped inter-subpixel regions have reduced lateral conductivity to prevent crosstalk, while the undoped subpixel regions maintain the necessary conductivity for device operation. This resolves the contradiction by preserving ease of manufacture through a single-layer structure while eliminating crosstalk through localized modification.

The patent replaces the mechanical fine metal mask system with a chemical doping approach. Instead of relying on mechanically fabricated masks with progressively finer features, the invention uses ion implantation or other doping techniques to modify the electrical properties of organic layers. This substitution achieves high manufacturing precision (reduced crosstalk) without the escalating complexity and cost associated with higher-resolution fine metal masks, as the doping process can be applied using existing semiconductor fabrication equipment.