Display Device Insulating Layer Recess for Leakage Current Reduction

The patent transitions from a two-dimensional groove structure to a three-dimensional recess structure with specific aspect ratio requirements (depth/width ≥ 0.5). This dimensional change allows the recess to extend deeper into the insulating layer, creating sufficient separation between the organic layer and the insulating layer interface, thereby preventing interface contact while maintaining leakage current reduction.

The patent specifies precise geometric parameters for the recess structure, including depth, width, and aspect ratio (depth/width ≥ 0.5). By controlling these parameters, the design ensures that the recess is deep enough to prevent organic layer contact with the insulating layer interface while maintaining manufacturability. This parameter optimization resolves the contradiction between leakage current reduction and interface contact prevention.

The patent applies local quality by creating recess structures specifically at the boundaries between adjacent pixels, while maintaining the organic layer thickness in the light-emitting regions. This localized modification increases resistance at pixel boundaries to prevent leakage current, while preserving the electrical properties needed for light emission in the active pixel areas, thus enabling high pixel density without color mixture.

The patent segments the insulating layer at pixel boundaries by forming recess structures that create electrical isolation between adjacent pixels. This segmentation approach allows each pixel to be electrically independent while maintaining close proximity for high resolution, effectively preventing leakage current between pixels even at high densities.

The patent optimizes the recess depth parameter by establishing a minimum aspect ratio (depth/width ≥ 0.5) rather than requiring excessive depth. This parameter optimization achieves sufficient electrical isolation to prevent leakage current while maintaining manufacturability. The specific ratio requirement provides a clear manufacturing target that balances performance with fabrication complexity.

The patent applies partial action by forming recesses only at the critical boundary regions between pixels, rather than throughout the entire insulating layer. This selective approach achieves leakage current prevention at pixel interfaces without unnecessarily increasing manufacturing complexity across the entire display structure.