OLED Pixel Insulating Structure for Leakage Current Blocking

The insulating layer is divided into multiple sub-layers (first insulating layer, second insulating layer, third insulating layer) with different materials and functions. Each layer serves a specific purpose: the first layer provides base insulation, the second layer blocks leakage current through its specific material properties, and the third layer provides additional insulation and structural support. This segmentation allows effective leakage current prevention while maintaining manufacturing feasibility through sequential deposition processes.

The patent employs a composite insulating layer structure combining different materials with complementary properties. The first insulating layer uses one material system, the second insulating layer uses a different material system with superior leakage blocking characteristics, and the third insulating layer uses yet another material. This composite approach leverages the strengths of each material to achieve comprehensive leakage current prevention that a single material cannot provide.

Instead of uniformly increasing the insulating layer thickness across all areas, the patent applies different thicknesses to different layers at different locations. The second insulating layer, which provides the primary leakage blocking function, is strategically positioned and sized to provide sufficient protection only where needed between pixels. The first and third layers provide supplementary insulation. This localized approach prevents leakage current effectively while minimizing the overall distance occupied by insulating structures between emission areas.

The patent transitions from a single-dimensional (single-layer) insulating structure to a multi-dimensional (multi-layer stacked) structure. By adding the vertical dimension with multiple stacked layers, the patent achieves superior leakage blocking capability without proportionally increasing the horizontal footprint. The layered configuration provides enhanced insulation through cumulative thickness and material diversity while maintaining compact lateral dimensions that keep emission areas close together.