OLED Display Substrate Barrier Grooves for Opening Encapsulation

The patent divides the opening into multiple regions by forming annular partition grooves that segment the opening into a first region (closer to the edge) and a second region (closer to the center). This segmentation allows different functional layers to be positioned in different regions, creating a barrier structure that prevents moisture and oxygen from reaching the flexible display layer while maintaining the opening's flexible display function.

The patent introduces a vertical dimension to the encapsulation structure by forming annular partition grooves that extend from the first surface toward the second surface of the substrate. This creates a three-dimensional barrier structure with bottom walls and side walls, transforming the traditional two-dimensional planar encapsulation into a multi-layered vertical barrier that blocks moisture and oxygen pathways.

The patent applies local quality by making the annular partition groove depth selective rather than uniform throughout. The groove extends from the first surface toward the second surface but does not necessarily penetrate completely through, creating different barrier heights at different locations. This allows effective moisture and oxygen blocking while reducing the overall manufacturing precision requirements compared to a full穿透 structure.

The patent creates a nested structure where the annular partition groove forms a barrier within the substrate thickness, and the flexible display layer is positioned in the space above the groove's bottom wall. This nested arrangement provides effective encapsulation without requiring the groove to extend through the entire substrate thickness, thereby reducing manufacturing complexity.