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676 results about "Situated display" patented technology

High-power LED (light-emitting diode) chip packaging quality detecting method

InactiveCN103364707ARealize online contact detectionIndividual semiconductor device testingControl systemHemt circuits
The invention relates to a high-power LED (light-emitting diode) chip packaging quality detecting method, and relates to a contact-type detecting method based on a PN junction photovoltaic effect. During the process of packaging a high-power LED chip, firstly, a uniform light field generated by a light source device (1) is irradiated vertically on light receiving surfaces of to-be-detected LEDs (3) and a standard LED (4) on a stand; secondly, photo-generated current signals generated on the PN junction are respectively guided into a signal sampling comparison circuit (6) by utilizing a pin fixture (5), and then the voltage values generated by each detected LED and the standard LED are compared and are subjected to difference value amplifying treatment; treated voltage difference values pass through a simulation switch (7), and are provided for a central control system (8) for analog-digital conversion and analysis, and the position of the LEDs with unqualified packaging quality is displayed on a display screen (9), and meanwhile an alarm is sent out. The method is used for eliminating errors generated by fixture contact resistors through introducing in the uniform light field and the standard LED and performing subtracting treatment for photo-generated signals, and guaranteeing the detection accuracy.
Owner:PUTIAN UNIV
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