Quality detection method for LED (Light Emitting Diode) nixie tube

Abstract

The invention discloses a quality detection method for an LED (Light Emitting Diode) nixie tube. A host circuit board, the LED nixie tube and a double-path stabilized voltage power supply are included; the host circuit board comprises a microprocessor, eight common-cathode digit driver transistors, eight common-anode digit driver transistors, a common-cathode segment driver transistor, a common-anode segment driver transistor and eight LED nixie tube section current-limiting resistors; each section of the nixie tube is lighted circularly, if a certain section or more than two sections are simultaneously lighted, the microprocessor judges that the tube has an open circuit or short-circuit fault and sends out an audio instruction to stop a testing process; and if no audio instruction is sent out, an instruction is sent out to simultaneously switch on eight section switch-on loops, so that eight sections of the LED nixie tube are simultaneously lighted, and whether brightnesses of all sections are uniform and consistent is observed. The method has the advantages of convenience for manufacturing of the devices, low cost and high cost performance; and mass quality detection of the factory LED nixie tube can be effectively solved.

Description

technical field [0001] The invention relates to the field of quality detection of monochromatic LED digital tubes, in particular to a quality detection method of LED digital tubes. Background technique [0002] LED digital tube is the main device for information display. It is a character form composed of simple LED light-emitting elements in a module. Commonly there are "8" character tubes, "m" character tubes and other styles. This type of LED digital display device has been widely used in various industrial equipment and household appliances for a long time, and the LED industry has maintained a momentum of continuous growth. Each LED component manufacturer will make great efforts in product quality control in order to establish its own brand and gain a competitive advantage. Therefore, LED products must undergo strict quality inspection before leaving the factory in order to find problems in production and products. The occurrence of these problems, on the one hand, is...

AI Technical Summary

Problems solved by technology

These problems arise, on the one hand, because the LED light-emitting elements and the modules supporting the digital tubes are purchased in batches, so it is impossible to guarantee that the quality of these components is fully qualified; on the other hand, because the LED digital tube production process involves many Many links still rely on manual operation, so during the assembly process, accidental scratches by workers will damage the tiny copper-clad wires and cause LED digital tube failures

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