Laser Dicing Energy Adjustment for Seal Ring-Safe Wafer Trenches

The patent replaces the mechanical sawing system with a laser dicing system. The laser beam ablates the wafer material to form trenches without physical contact, eliminating mechanical forces that cause inconsistent trench depths and seal ring damage. This substitution of mechanical action with optical/thermal action resolves the contradiction between manufacturing precision and reliability.

The patent employs adjustable laser parameters including energy level, pulse duration, and scanning speed to optimize the dicing process. By dynamically controlling these parameters, the system achieves consistent trench depths across different wafer regions while preventing excessive energy input that could damage seal rings, thus resolving the precision-reliability contradiction.

The patent applies different laser energy levels to different regions of the wafer based on local material properties and structural requirements. The system adjusts laser parameters dynamically as it scans across the wafer, applying lower energy near seal rings to prevent damage while maintaining higher energy in bulk material regions for efficient trench formation, thus achieving grooving consistency without seal ring damage.

The patent implements a feedback control mechanism where the laser system monitors processing conditions and adjusts energy levels in real-time. This feedback loop ensures that the laser energy remains within safe thresholds to prevent seal ring damage while maintaining consistent grooving quality, resolving the contradiction between precision and harmful effects.

The patent divides a single laser source into multiple parallel laser beams using optical splitting components. This segmentation allows simultaneous dicing of multiple tracks or parallel processing of the wafer surface, significantly improving dicing efficiency without requiring multiple independent laser sources, thus achieving higher productivity with moderate system complexity.

The patent designs the laser system with adjustable parameters and multiple operating modes that can adapt to different wafer materials and thicknesses. The single laser source can be configured to handle various semiconductor materials through parameter adjustment, providing multi-functionality that improves productivity across different applications without proportionally increasing device complexity.