Multi-layered Alignment Lines for LED Display Fabrication

The patent transitions from a single-layer alignment line to a multi-layered alignment line structure, adding vertical dimensionality to improve alignment precision. The alignment lines are formed in multiple layers (first alignment line layer, second alignment line layer, third alignment line layer) with different heights, enabling more precise positioning of light emitting devices in three-dimensional space while maintaining reasonable structural complexity.

The alignment line structure is segmented into multiple independent layers, each serving specific alignment functions. The first alignment line layer provides base alignment, the second alignment line layer provides intermediate alignment, and the third alignment line layer provides fine alignment. This segmentation allows each layer to be optimized independently for its specific alignment task, improving overall alignment precision.

The alignment lines are constructed using composite material structures with different conductive properties in different layers. The first alignment line layer uses a first conductive material, the second alignment line layer uses a second conductive material, and the third alignment line layer uses a third conductive material. This composite approach allows optimization of electrical conductivity for voltage transfer while managing manufacturing complexity through standardized multi-layer fabrication processes.

The second alignment line layer acts as an intermediary conductive path between the first and third alignment line layers. This intermediate layer facilitates efficient voltage transfer by providing a dedicated conductive pathway that reduces voltage drop, while the multi-layer structure allows each intermediary layer to be manufactured using established semiconductor fabrication techniques.