LED Digital Tube Commonly Used Segments

LED digital tube commonly used segments

  The number of segments commonly used in led digital tubes is generally 7 segments, some plus a decimal point, and the other is similar to the 3-digit "+1" type. The number of digits is half, 1, 2, 3, 4, 5, 6, 8, 10, etc.... The led digital tube is divided into two types: common cathode and common anode according to the connection method of LED. Understand LED These characteristics are very important for programming, because different types of digital tubes have different programming methods in addition to their hardware circuit differences.

       It is the internal circuit of common cathode and common anode digital tubes. Their light-emitting principles are the same, but their power supply polarities are different. The colors are red, green, blue, yellow, etc. LED digital tubes are widely used in instruments, clocks, stations, home appliances and other occasions. When choosing, pay attention to product size, color, power consumption, brightness, wavelength, etc. The following will introduce the internal pin pictures of commonly used LED digital tubes.

This is a 7-segment, two-digit, 10-pin LED digital tube with a decimal point. Figure 2 Pin definition Each stroke corresponds to a letter indicating that DP is a decimal point. By controlling the COM terminal of each LED digital tube in turn by time-sharing, each digital tube is controlled and displayed in turn, which is dynamic driving.

The lighting time of each digital tube is 1-2ms. Due to the persistence of human vision and the afterglow effect of light-emitting diodes, although each digital tube is not lit at the same time, as long as the scanning speed is fast enough, People's impression is a set of stable display data without flickering. The effect of dynamic display is the same as that of static display, which can save a lot of I/O ports and lower power consumption.

Extended information

Power Estimation

1. Static real pixels (equal spacing and non-equal spacing are the same): 16*8 real pixel single module maximum power consumption 16*8*3*0.02=7.68 16 - 16 pixels wide; 8 - 8 pixels Point height; 3 - each pixel point consists of three currents; 0.02 - estimates the size of each current.

Note: 2R1G1B real pixel two red LEDs connected in series only count as one current.

2. Static virtual pixels (equal spacing) 2R1G1B: The maximum power consumption of a single module is 16*8*4*0.02=10.24 16-16 pixels wide; 8-8 pixels high; 4-each pixel The point is composed of 4 currents; 0.02—estimates the size of each current.

Note: 2R1G1B virtual pixel two red LEDs are separated and each tube is counted as one current.

3. Scan real image (1R1G1B) or (2R1G1B): Take the P10 full-color four-scan 16*16 module as an example, the maximum power consumption of a single module (16*16*3*0.02)/4=3.84 16-16 pixels Point width; 16 - 16 pixels high; 3 - 3 currents per pixel; 0.02 - estimate the size of each current; 4 - 1/4 scan.

Note: 1R1G1B real pixel four LED lamps are connected in parallel to calculate one current; the estimated utilization rate of each power supply of the scanning board is 80%.

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