1. Power supply: Inferior power supply will cause overload operation of the power supply, frequent screen failures, and even fires.

2. Lamp beads: Inferior LED lamp beads have short life, large heat generation, large color difference, and fast attenuation, which seriously affects the display effect and life of the large screen.

3. PCB board: its own material is inferior, the copper coating is too thin, the design is unreasonable, and the poor craftsmanship leads to burrs on the copper wire, etc., which will cause short circuits and become the root of fire hazards.

4. Wire: The quality of wire on the market is uneven. Many wire spools are copper-clad aluminum, which looks like copper wire but are actually aluminum alloy wire; this kind of wire is generally used for temporary wire and cannot be used for regular products. superior.

1. LED brightness: the brightness of light-emitting diodes is generally expressed by luminous intensity (Luminous Intensity), the unit is candela cd; 1000ucd (microcandela) = 1 mcd (millicandela), 1000mcd = 1 cd. The light intensity of a single LED for indoor use is generally 500ucd-50 mcd, while the light intensity of a single LED for outdoor use should generally be 100 mcd-1000 mcd, or even more than 1000 mcd.

2, LED pixel module: LEDs are arranged in a matrix or pen segments, and are pre-made into standard size modules. Commonly used indoor display screens are 8*8 pixel module, 8-character 7-segment digital module. The outdoor display screen pixel module has specifications such as 4*4, 8*8, 8*16 pixels. The pixel module used in outdoor display screens is also called a collective tube bundle module because each pixel is composed of more than two LED tube bundles.

3. Pixel and pixel diameter: Each LED light-emitting unit (dot) in the LED display screen that can be individually controlled is called a pixel (or pixel). Pixel diameter ∮ refers to the diameter of each pixel, in millimeters.

4. Resolution: The number of rows and columns of pixels on the LED display screen is called the resolution of the LED display screen. Resolution is the total number of pixels of the display screen, which determines the information capacity of a display screen.

5. Grayscale: Grayscale refers to the degree of changes in the brightness of the pixel's luminescence. The grayscale of a primary color generally has 8 to 12 levels. For example, if the gray level of each primary color is 256 levels, for a dual primary color screen, the display color is 256×256=64K colors, which is also called a 256-color display screen.

6. Dual-primary color: Most color LED display screens are dual-primary color screens, that is, each pixel has two LED dies: one is a red light die and the other is a green light die. The pixel is red when the red light die is bright, the pixel is green when the green light die is bright, and the pixel is yellow when the red and green die are on at the same time. Among them, red and green are called primary colors.

7. Full color: Red and green double primary colors plus blue primary color, three primary colors constitute full color. Since the technology for forming a full-color blue tube and a pure green tube core is now mature, the market basically uses full-color.

1. If the LED display is installed against the wall, it depends on how much the LED display can protrude. If it can protrude one meter from the wall, it is recommended to choose the fan according to the area, and the fan should be installed on the side of the screen. Arranged in sequence above the. If the LED display purchased by the customer is an outdoor full-color LED display with a size of 80 square meters, six axial fans with a diameter of about 600mm should be selected. Special attention should be paid to ensure that the fan is exhausted to the outside and equipped with a protective net to prevent the technician repairing the display from sucking clothes in and causing personal injury when repairing the display. In addition, aluminum alloy shutters should be installed on the air outlet of the fan on the outside aluminum-plastic panel to achieve the effect of waterproofing.

Wall-mounted full-color LED displays can also be equipped with air conditioners. Make sure that the air conditioner host is placed in place and does not affect the overall appearance of the wall. The choice of air conditioner is required. Generally, 1.5P, 2P and 3P air conditioners are the most used. The calculation of 12 square 1P air conditioners in northern cities; and the calculation of 9 square 1P air conditioners in southern cities. If the area of the LED outdoor display is relatively large, the air conditioner should be customized directly by the manufacturer. If the area is not large, you must go to a specialty store to buy it. However, the display cooling air conditioner has a call compensation function.

2. If the LED display is installed with a column, it is best to use a fan to dissipate heat. The fan is installed on the aluminum-plastic plate on the back of the large screen, and it is best to lean upwards and make it into the form of blinds for rain. Rain does not enter the display screen. If it is a double column, open several shutters in the middle of the double column. This window is the air inlet, and the fan above is the air outlet, so that complete air convection is formed and the heat dissipation effect is better.

1. Fan heat dissipation, use a long-life and high-efficiency fan inside the lamp housing to enhance heat dissipation. This is a common method with low cost and good effect.

2. Use aluminum fins, which is the most common way of heat dissipation. Use aluminum fins as part of the shell to increase the heat dissipation area.

3. Aerodynamics uses the shape of the lamp housing to create convective air, which is the lowest cost method of enhancing heat dissipation.

4. Surface radiation heat dissipation treatment. The surface of the lamp housing is treated with radiation heat dissipation. The simpler is to apply radiation heat dissipation paint, which can take the heat away from the surface of the lamp housing by radiation.

5. Integration of heat conduction and heat dissipation-the use of high thermal conductivity ceramics, the purpose of lamp housing heat dissipation is to reduce the operating temperature of the LED high-definition display chip, because the expansion coefficient of the LED chip is very different from the expansion coefficient of our usual metal heat conduction and heat dissipation materials. The LED chip cannot be directly welded to avoid high and low temperature thermal stress from damaging the LED display chip.

6. Heat pipe heat dissipation, using heat pipe technology to conduct heat from the LED display chip to the shell radiating fins.

7. The thermally conductive plastic shell is filled with thermally conductive material when the plastic shell is injection molded, so as to increase the thermal conductivity and heat dissipation capacity of the plastic shell.

1. Make a 3V DC power supply that is easy to connect to the light-emitting diode by yourself. It is best to use a battery to make it. You can use two button batteries, which are installed in a small plastic tube and lead out two probes as positive and negative outputs. The tail end is directly made into a switch with shrapnel. When in use, the positive and negative probes correspond to the positive and negative of the light-emitting diode. On the negative pin, press and hold the switch at the end, and the luminous tube will emit light.

2. Secondly, combine a photoresistor and a digital multimeter to form a simple light measuring device. Lead the photoresistor with two thin wires and connect them directly to the two test leads of the digital multimeter. The multimeter is placed at the 20K position (depending on the photoresistor, Try to make the reading as accurate as possible). Note that the measured value is actually the resistance value of the photoresistor. Therefore, the brighter the light, the smaller the value.

3. Take an LED light-emitting diode and use the above 3V direct current to light it. The light-emitting head is facing and close to the photosensitive surface of the connected photoresistor. At this time, the multimeter reads to distinguish the brightness of the LED.

1. Maintain the humidity of the environment where the full-color LED display is used, and do not let anything with moisture into the full-color LED display. Powering on a full-color display that contains humidity will cause corrosion of the components of the full-color display, resulting in permanent damage.

2. To avoid problems that may be encountered, we can choose passive protection and active protection, try to keep the items that may cause damage to the full-color display screen away from the screen, and wipe the screen as gently as possible when cleaning the screen, The possibility is minimized.

3. The large screen of the LED full-color display has the closest relationship with our users, and it is very necessary to do a good job in cleaning and maintenance. Long-term exposure to outdoor environments such as wind, sun, dust, etc. will easily become dirty. After a period of time, there must be a piece of dust on the screen. This needs to be cleaned in time to prevent the dust from wrapping the surface for a long time to affect the viewing effect.

4. It is required that the power supply is stable and the grounding protection is good. Do not use it under severe natural conditions, especially strong thunder and lightning.

5. It is strictly forbidden to enter the screen body such as water, iron powder and other easily conductive metal objects. The large screen of the LED display should be placed in a low-dust environment as much as possible. Large dust will affect the display effect, and too much dust will cause damage to the circuit. If water enters due to various reasons, please cut off the power immediately and contact the maintenance personnel until the display panel in the screen is dry before use.

6. The switch sequence of the LED display: A: First turn on the control computer to make it run normally, then turn on the large screen of the LED display; B: Turn off the LED display first, then turn off the computer.

7. Don't stay in full white, full red, full green, full blue, etc. for a long time during playback, so as to avoid excessive current, excessive heating of the power cord, damage to the LED light, and affect the service life of the display. Do not disassemble or splice the screen at will!

8. It is recommended that the large LED screen has a rest time of more than 2 hours a day, and the large LED screen should be used at least once a week during the rainy season. Generally, turn on the screen at least once a month and light it for more than 2 hours.

9. The surface of the large screen of the LED display can be wiped with alcohol, or use a brush or vacuum cleaner to remove dust. It cannot be wiped directly with a damp cloth.

10. The large LED display screen needs to be checked regularly for normal operation and whether the circuit is damaged. If it does not work, it should be replaced in time, and the circuit should be repaired or replaced in time if it is damaged. The internal wiring of the LED display is forbidden to touch by non-professionals to avoid electric shock or damage to the wiring; if there is a problem, please professionally repair it

1. According to the viewing distance:P generally represents the pixel pitch, and the value after P mainly refers to the distance between two pixels, which we usually call the pixel pitch. And the smaller the value of the dot pitch, the higher the unit pixel, the clearer the display screen, and the more suitable for viewing at close range.Therefore, for outdoor LED displays, the distance is very close, generally P6 or P8, P10 or P12 for the farther, P16 or P20 for the farther

As the LED electronic display screen is used for a long time, some failures may occur. If the LED electronic display screen has the following brightness problems, you can check it by comparison: Ⅰ. The whole screen is not bright (black screen)

In fact, the cause of the LED display screen is nothing more than the power supply, the adapter, the board card, and the worst result is that the LED lamp bead burns out. One of the most common faults is the power supply, including damage to the adapter, loose power supply, and unstable voltage