OLED Pixel Isolation via Hydrophobic Barriers

The charge transport layers are segmented into pixel-specific regions by the hydrophobic patterns. The first hydrophobic pattern divides the hole injection layer into regions corresponding to individual pixels, and the second hydrophobic pattern divides the hole transfer layer into pixel-specific regions. This segmentation prevents charge carriers from leaking into adjacent pixels while maintaining high conductivity within each pixel region, thus resolving the cross talk issue without sacrificing luminance efficiency.

The hydrophobic patterns serve as intermediary barrier structures between adjacent pixel regions. These patterns have lower electric conductivity than the charge transport layers and act as insulating barriers that prevent charge carrier leakage. The intermediaries (hydrophobic patterns) allow the charge transport layers to maintain high conductivity for efficient charge transport while blocking the harmful cross talk effect between adjacent pixels.

The hydrophobic patterns are formed on the substrate before coating the charge transport layers. These pre-formed patterns create hydrophobic barriers that guide the coating process, allowing the charge transport layers to be deposited without additional patterning steps. The preliminary action of forming hydrophobic patterns enables subsequent simple coating while preventing charge carrier leakage through the hydrophobic barriers.

The hydrophobic patterns act as intermediary structures that enable both simple manufacturing and effective charge carrier isolation. By serving as pre-formed barriers, they allow the charge transport layers to be coated uniformly without complex patterning while still preventing charge carrier leakage into adjacent pixels through the hydrophobic/low-conductivity properties of the patterns.

Instead of relying solely on increasing pixel defining layer thickness, the invention changes the parameter of electric conductivity by introducing hydrophobic patterns with lower conductivity than the charge transport layers. This parameter change provides effective charge carrier isolation without requiring excessive thickness, thereby reducing manufacturing precision requirements while maintaining pixel isolation effectiveness.

The hydrophobic patterns serve as intermediary barrier structures that enhance pixel isolation without requiring thick pixel defining layers. These patterns provide additional isolation functionality through their low conductivity properties, allowing thinner pixel defining layers to achieve the same isolation effect, thus reducing manufacturing precision requirements while effectively preventing charge carrier leakage.