The digital tube is a semiconductor light emitting device whose basic unit is a light emitting diode. The digital tube can be divided into seven segments of digital tubes and eight segments of digital tubes according to the number of segments. The eight-segment digital tube has one more LED unit than the seven-segment digital tube. That is, one decimal point (DP) can indicate the digital tube more accurately. What to display; according to how many can be displayed (8) can be divided into 1, 2, 3, 4, 5, 6, 7 and other digital tubes.
According to the connection mode of the LED unit, it can be divided into a common anode digital tube and a common cathode digital tube. The common anode digital tube refers to the digital tube that connects all the anodes of the light-emitting diodes together to form a common anode (COM). The common anode digital tube should be connected to the common pole COM to +5V when applied, when the cathode of a field LED When it is low, the corresponding field is lit. When the cathode of a certain field is high, the corresponding field is not lit. The common cathode digital tube refers to a digital tube that connects the cathodes of all the light-emitting diodes together to form a common cathode (COM). When the common cathode digital tube is applied, the common pole COM should be connected to the ground line GND, when a field LED is used. When the anode is high, the corresponding field is lit. When the anode of a field is low, the corresponding field is not lit.
Third, the digital tube structureThe digital tube is composed of 8 light-emitting diodes (hereinafter referred to as fields), which can be used to display numbers 0~9, characters A ~ F, H, L, P, R, U, Y, symbol "-" and decimal point. ". The outline structure of the digital tube is shown in the figure below. The digital tube is divided into two structures: a common cathode and a common anode.
The anodes (diode positive ends) of the eight LEDs of the common anode digital tube are connected together. Usually, the common anode is connected to a high level (generally connected to the power supply), and the other pins are connected to the output of the circuit. When the output of a certain driving circuit is low, the field connected to the terminal is turned on and lights up. Various numbers or characters can be displayed depending on different combinations of illuminating fields. At this time, the segment drive circuit is required to absorb the rated segment conduction current, and the corresponding current limiting resistor is determined according to the external power supply and the rated segment conduction current.
The cathodes (diode negative ends) of the eight LEDs of the common cathode digital tube are connected together. Usually, the common cathode is connected to a low level (generally grounded), and the other pins are connected to the output of the circuit. When the output of a certain driving circuit is high, the field connected to the terminal is turned on and lights up, and various numbers or characters can be displayed according to different combinations of the illuminating fields. At this time, the segment drive circuit is required to provide the rated segment conduction current, and the corresponding current limiting resistor is determined according to the external power supply and the rated segment conduction current.
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