HETEROGENEOUS CHIPLET ID USING PHOTOLUMINESCENCE IN uASSEMBLER SYSTEM

Abstract: a machine vision system and method uses photoluminescence light response of micro-leds to identify types of micro-leds (e.g., red, green, or blue) that are used to assemble a micro-led display. excitation light (e.g., ultraviolet excitation light) in a certain wavelength range is illuminated on a random pool of heterogeneous micro-leds consisting of materials, for example, that photoluminesce in three different colors-red, green, or blue. the micro-led is optically excited and will emit either red, green, or blue, photoluminescence light based on the type of the micro-led. the machine vision system uses a camera device that includes color response sensors to differentiate the type of micro-led. the orientation of the micro-led can also be detected. the machine vision system, based on the type, location, and orientation of the heterogeneous micro-leds, provides image-data based optical feedback to a microassembler system to move the micro-leds on a planar working surface according to an electrostatic template.

Inventor(s): Jeng PING LU, Sourobh RAYCHAUDHURI, Eugene Michael CHOW, Thomas WUNDERER, Patrick Yasuo MAEDA

CPC Classification: G01N21/8806 ({Specially adapted optical and illumination features})

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