Display Panel Outer Dummy Traces for Etching Uniformity

The patent applies local quality by creating different metal wire density zones: the first area (near display area) has higher wire density for electrical connection, while the second area (outer non-display area) has lower wire density to prevent non-uniformity. This spatial variation in wire distribution resolves the contradiction between ensuring electrical connectivity and maintaining etching uniformity across the substrate.

The patent segments the non-display area into two distinct zones: a first area adjacent to the display area containing signal lines for electrical connection, and a second area (outer non-display area) with outer dummy traces. This segmentation allows concentrated wiring where needed while distributing wires evenly across the entire substrate to maintain composition uniformity and prevent blank areas.

The outer dummy traces in the second area serve multiple functions: they act as etching references to improve manufacturing precision, provide mechanical support to prevent substrate deformation, and maintain metal wire distribution uniformity. By making these structures multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved etching uniformity.