What is the working principle of Shandong LED display screen?

　　The Shandong LED display screen is a liquid crystal, a very special substance. It can flow like a liquid and also has some optical properties of crystals. Liquid crystal is an organic compound, as discovered by Austrian botanist Reinitzer in 1888, with molecules arranged regularly between solid and liquid states. The arrangement of liquid crystal molecules has a certain order, which is very sensitive to external conditions such as temperature and electromagnetic fields. The electric field changes the arrangement of LCD molecules, affecting optical properties, which is called the electro-optic effect.

　　Usually, two glass substrates are coated with alignment films, and the liquid crystal screen is oriented along grooves. Because the glass substrate faces the groove at 90 degrees, the molecules on the liquid crystal screen are neatly arranged in the same plane like blinds. When the molecular orientation shifts from one angle to another, it gradually twists 90 degrees. In other words, the phase difference between the two layers of molecular arrangement is 90 degrees. The commonly used LCD style is nematic, where molecules are elongated rods about 1-10 nm in length and width (1 nm = 10 Å). Under the influence of electric current and electric field, LCD molecules rotate regularly by 90 degrees, producing differences in transmittance, functioning as on and off switches.

　　What are the precautions for Shandong LED display screen?

　　Precautions for the switch

　　1. Power-on sequence: When turning on the screen: first turn on the power, then turn on the screen. When turning off the screen: first turn off the screen, then turn off the power.

　　2. When switching LED displays, there should be an interval of more than 5 minutes.

　　3. The computer must enter the engineering control software before turning on the screen power.

　　4. Do not turn on the screen in full-screen mode because the system's inrush current is large at this time.

　　5. The system's inrush current is large at this time; do not turn on the screen when out of control.

　　a. The computer has not entered the control software or other programs.

　　b. The computer cannot be powered on.

　　c. The control part is not powered on.

　　6. When the ambient temperature is too high or cooling conditions are poor, avoid keeping the screen on for a long time.

　　7. When a part of the LED display screen is very bright, turn off the screen promptly; do not keep the screen on for a long time in this state.

　　8. If the display power switch trips frequently, immediately check the main screen or replace the power switch.

　　9. Regularly check the firmness of the hooks. If there is any looseness, adjust, reinforce, or replace the crane in time.

　　10. According to the environment of the display screen and control part, avoid insect bites; if necessary, place rodent repellents.

　　What are the precautions for the control part of the Shandong LED display screen?

　　1. For the computer and control part power lines, the neutral and live wires must not be reversed, so insert them correctly in their original positions. If there are peripherals, connect them first and then test whether the casing is charged.

　　2. When moving computers or other control devices, before powering on, first confirm whether the connection cables and instrument panels are loose.

　　3. The positions and lengths of communication cables and flat connection cables cannot be freely changed.

　　4. If abnormalities such as short circuits, tripping, burning wires, or smoke occur after moving, do not repeat electrical tests; consult promptly.