Micro-LED Transfer Stamp Using UV Photochromism

The patent applies parameter changes by utilizing UV irradiation to alter the surface energy characteristics of the stamp material. This causes a reversible change in the hydrophilicity/hydrophobicity of the stamp surface, enabling controlled adhesion and release of micro-LEDs during the transfer process, thereby simplifying the transfer operation and improving yield.

The patent implements dynamics by making the stamp's surface properties dynamically changeable through UV irradiation. The stamp transitions between adhesive and non-adhesive states, allowing the transfer process to be controlled in two stages: first adhering micro-LEDs to the stamp, then releasing them onto the array substrate, thus reducing process complexity and improving transfer efficiency.

The patent applies periodic action by using sequential UV and visible-ray irradiation to cyclically change the stamp's surface properties. UV irradiation creates a high-adhesion state for picking up micro-LEDs, while subsequent visible-ray irradiation creates a low-adhesion state for release, enabling efficient periodic transfer cycles without manual intervention.

The patent replaces mechanical separation processes with optical control. Instead of using mechanical force to separate micro-LEDs from the stamp, the patent uses visible-ray irradiation to optically induce hydrophobicity changes on the stamp surface, causing automatic release of micro-LEDs and eliminating complex mechanical separation mechanisms.