Abstract
An online non-contact fault detection technique of LED chips is presented based on the photovoltaic effect in diodes. By observing the current in the bonding lead frame of a LED chip, which is induced by illuminating the 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. Red, yellow and green LED chips are tested in the experiment. 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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