Fiducial Alignment Marks for LED Chip Bonding Accuracy

The patent applies preliminary action by pre-forming grooves in the conductive pads before the bonding process. These grooves are created in advance to guide the conductive material and accommodate thermal expansion, establishing a tolerance buffer that prevents misalignment issues during actual bonding operations.

The patent changes the geometric parameters of the conductive pad structure by introducing grooves with specific dimensions (depth and width). This structural parameter modification allows the pad to accommodate dimensional changes during bonding while maintaining electrical connection, effectively reducing the stringency of placement accuracy requirements.

The patent modifies the geometric parameters of conductive pads by adding grooves, which is a relatively simple structural change that can be integrated into existing manufacturing processes. This parameter modification provides tolerance compensation without requiring complex manufacturing equipment or multi-step alignment procedures.

The conductive pad is segmented by introducing grooves that divide the pad structure into distinct regions. This segmentation creates channels for conductive material flow and establishes reference features for alignment, simplifying the bonding process while maintaining reliability.

The fiducial alignment marks are formed by removing the reflective metal layer in specific patterns, creating non-reflective regions that contrast with the surrounding reflective conductive pads. This optical contrast enables easy detection and alignment during manufacturing while maintaining process simplicity.

The fiducial alignment marks serve as intermediary reference features between the conductive pads and the LED die. These marks provide a common reference framework that simplifies alignment operations without adding complex manufacturing steps, acting as a mediator that translates between different component geometries.