Abstract

An online non-contact fault detection Method of LED chips is presented based on the photovoltaic effect in diodes. By observing the photo-generated current in the bonding lead frame of a LED chip, the LED chip and its electric connection with the lead frame during packaging are checked. The fault detection principle is described in detail in this paper. By using the method based on the law of electromagnetic induction, the photo-generated current can be measured without any touch. The experimental results show that the method can be easily realized, and thus can be used for online fault detection of LED chips in packaging.

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