LED (Light Emitting Diode), light-emitting diode, is a solid-state semiconductor device, which can directly convert electricity into light. The heart of LED is a semiconductor wafer, one end of which is attached to the LED on a bracket, one end is a negative electrode, and the other end is connected with the positive pole of the power supply, so that the whole chip is encapsulated by epoxy resin. The semiconductor chip is made up of two parts, one part is the P type semiconductor, in which the hole is dominant, the other end is the N type semiconductor. But when these two semiconductors are connected, they form a "P-N junction". When the current through the wire to the chip, the electron will be pushed to the P area, in the P area of the electron and hole compound, and then will be in the form of photon energy, which is the principle of LED luminescence. The wavelength of light is the color of light, which is determined by the material that forms the P-N junction. First, what is the LED digital tube? Also known as LED guardrail tube, LED guardrail lamp, LED light; this product to be used for contour building installation, KTV door or advertising signs, and road and bridge guardrail lighting project; can achieve the colorful water, chase, scan and other effects; if a LED digital tube screen (LED digital sign) can produce all kinds of flash animation and flower type, you can also play video and text pattern. In two, LED digital tube according to the classification effect can be divided into: single color color (red, yellow, blue, green, white); seven can be divided into: single segment colorful gradient jump; really really six, eight segments, 12 segments, 16 segments, 32 segments, 48 segments. According to the control method is divided into: internal control and external control. Internal control: internal LED fence tube is the program directly into the IC chip LED guardrail tube, directly connected to the power out of flower type; external control is simply need external controller; controller is divided into offline system and online system; on-line system is refers to the attachment control system work on a computer (for the LED digital tube screen); offline system is not attached to the computer, after the electrical connection can input control signal to drive the LED guardrail tube. In three, LED digital tube installed outside the control of the LED tube to clear signal, usually from male to female head for signal input, output signal; signal direction and then according to the manufacturers to provide the installation diagram, if wrong, have to break down and wear, also time-consuming fee funds. The other is the power installation: if DC (DC) LED digital tube must pay attention, under normal circumstances: small plug two core power, red is positive, the blue line is negative; after the installation must first check the circuit, confirm the OK, and then power; otherwise it will cause LED digital tube burn, seriously affect the project acceptance.
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