OLED Array Substrate Layout for Stable Driving Current

The patent applies asymmetry by designing the second signal line with a branched structure where the branch extends in a direction substantially perpendicular to the first signal line. This asymmetric configuration breaks the parallel alignment between signal lines and anode layers, reducing electromagnetic interference while maintaining manufacturing feasibility. The branch structure creates non-parallel overlapping projections that minimize interference pathways.

The patent transitions from a two-dimensional parallel arrangement to a three-dimensional overlapping configuration. By creating overlapping projections between the anode layer and signal lines with branched structures, the design utilizes vertical layering to reduce in-plane interference. The orthographic projections overlap in the plan view while the actual conductive paths are separated in the vertical dimension through different conductive layers.

The patent implements feedback mechanisms through pixel driving circuits that include transistors configured to regulate driving current. The circuits monitor and adjust the current supplied to each OLED subpixel, compensating for variations and ensuring consistent brightness. The overlapping conductive structures also provide feedback by stabilizing the electrical connection between signal lines and anode layers.

The patent changes the geometric parameters of the conductive structures, specifically the overlapping area between anode layers and signal lines. By optimizing the overlap dimensions and configurations, the design improves electrical contact stability and current distribution uniformity, which directly affects brightness consistency across all subpixels.

The patent segments the second signal line into a main body and a branch, creating distinct functional zones. The main body provides the primary current path with controlled overlapping projection, while the branch extends perpendicularly to provide additional contact points without significantly increasing overall complexity. This segmentation allows optimization of electrical contact while maintaining manageable structural complexity.

The patent merges multiple functions into the branched signal line structure. The same conductive features that create overlapping projections for improved electrical contact also serve as the signal transmission pathways. The first and second signal lines are integrated into a unified conductive network that simultaneously provides electrical contact, current distribution, and signal routing functions.