Outdoor LED Screen
LEGIDATECH LED provides energy-saving outdoor LED display products and various pixel spacing for hotels, shopping malls, governments, subways, enterprises, banks, stock exchange centers, train stations, airports, etc. Why do most outdoor advertising LED Displays use DIP LED displays?
The reason is that the LED display has a stronger environmental adaptability, can waterproof, moisture-proof and dust-proof, and can automatically adjust the brightness of the cooling block according to the environmental brightness to meet the visual needs of the human eye.
Common application scenarios include the exterior led wall screens of shopping malls and the text advertisements on the front doors of shopping malls. When selecting the LED display, we can choose the right point spacing product according to the budget and viewing distance, and choose the right installation and maintenance method according to the installation location.
1.Outdoor LED screen introduction
2.Outdoor LED display installation ideas
3.Outdoor full-color LED display cabinet how to do waterproof treatment?
4.Outdoor LED sign 10 advanced technical parameters
5.Outdoor LED video wall compared to LCD display
6.LED display for reference
7.LED outdoor signs will be affected by many factors, resulting in unsatisfactory display or malfunctioning solutions.
8. What should we do if the outdoor LED display module is broken? Five common outdoor LED display module fault repair methods
1.The first chapter outdoor LED display screen introduction
Outdoor LED screen is generally composed of sheet metal box or aluminum profile box using building block splicing outdoor led display system,
strong current control system, weak current control system, structural frame system, ventilation system and steel structure frame decoration six parts.
According to customer needs, sometimes also need to include civil construction, steel column, concrete column, wall hanging steel structure installation engineering system.
1.1 Display cabinet
It is the main part of the outdoor LED display, which is composed of outdoor LED display module, sheet metal box, LED receiving card and switching power supply.
1.2 Weak current control system
The system is mainly composed of LED video processor and LED sending card and LED receiving card. The main function of the control system is data acquisition, logic operation, buffering, to produce a variety of scanning signals and gray control signals. The system is equivalent to the brain and nerves of the human body, controlling the display information and signals of the display screen. The control systems are made by brands such as Novastar and Linsn Control Systems.
1.3 Strong current control system
The system is the power source of led display, because the supply voltage of the outdoor LED module is low voltage 5V, the switching power supply of the led outdoor display will convert 380V\220V AC to control the input voltage of the display box.
1.4 Type 6 network cables are shielded for data transmission. Optical fiber cables can be used for long distances.
Display data and various control signals are transmitted to the screen through twisted pair or optical fiber cable.
1.5 Computer and its peripherals
The main function of this part is to produce video and sound, referred to as video source.
1.6 Box connection piece
Responsible for the box connection fixed on the outer frame to form the entire display body, in the installation of outdoor LED display box pay attention to the strength and flatness of the steel structure.
2. Outdoor LED display installation idea matters
For outdoor LED display, because it is used outdoors. So it is inevitable to be treated differently from ordinary indoor LED display. Outdoor LED screen installation requirements are also different from ordinary indoor LED. In the installation must be done in the details. Otherwise it could lead to trouble. Outdoor LED screen installation six ideas:
1.Installation of outdoor LED screen building objects should be installed lightning rod.
The main body and shell of the display are well grounded, and the grounding resistance is less than 3 ohms, so that the large current caused by lightning can be released in time; Outdoor LED signs may be subject to strong electric and magnetic interference caused by lightning.
2.Waterproof measures of the LED video wall itself
The screen body and the joint part of the screen body and the building must be strictly waterproof and leakproof; Screen body should have good drainage measures, once the water can be discharged smoothly; Pay attention to waterproof, moisture-proof. Outdoor LED screen installed in the outdoors, often sun and rain, wind blowing dust cover, poor working environment. The switching power supply and circuit board are wet or seriously damp will cause short circuit or even fire, causing failure or even fire, resulting in losses;
3.Circuit piece selection
Choose an industrial-grade circuit chip with a working temperature between -40 ° C and 80 ° C to prevent the winter temperature from being too low so that the display can not start and to prevent the temperature from being too high so that the outdoor LED signs crashes.
4.Install ventilation equipment to cool down, if necessary, install air conditioning in the LED outdoor signage frame, so that the internal temperature of the led screen body is between -10 ° C and 40 ° C.
Axial fan is installed behind and above the screen body to discharge heat; Outdoor LED screen itself must produce a certain amount of heat when working, if the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may not work properly, or even be burned, so that the led sign system can not work normally;
The installation precautions of outdoor LED electronic display involve the use and safety of the product in the future, and must be treated strictly and seriously.
3:.Outdoor full color LED display cabinet how to do waterproof treatment?
Outdoor LED sign will be subjected to rain and other environments, especially outdoor LED advertising display for a long time in the outdoor playing environment. So must do a good job of waterproof treatment, then the full color LED signage waterproof box is how to do waterproof? What are the special requirements for the box structure? As the outdoor LED module plus closed box structure is processed to form an outdoor display waterproof box, the waterproof box is assembled into an outdoor full-color display. So LED outdoor signs box is the basic unit of the led display body.
The advantages of LED cabinet structure are as follows:
One is easy to dispatch, aging, on-site maintenance;
Second, it is easy to package and transport;
Third, it is convenient to install and disassemble on site.
The LED outdoor sign outdoor waterproof box is equipped with a led display module in front of the box, and the display drive circuit board is fixed inside the box. The switching power supply is installed on the back cover of the box. In the back cover of the box is also installed with exhaust fans, stamping window and so on. The internal and external surface of the box is sprayed with plastic treatment, with anti-corrosion, moisture-proof, anti-oxidation, flame retardant and other functions, to provide security for the work of the led display body.
As far as the structure of the outdoor LED screen is concerned, the first module should be an outdoor waterproof module, the back of the second module should be brushed with three anti-paint, third, the box should be a waterproof box, sealing is better.
You can do waterproof test, sprinkling water on the surface of the display test. After a number of tests, the outdoor LED screen waterproof box IP protection level to reach IP65 in order to achieve the true sense of waterproof, in addition to the LED video wall box structural perishable parts roughly screen body part of the metal column, circuit board, terminal, connector; Water vapor sensitive components for the circuit board, electronic components pin. Other component kits, all engineering plastics (polycarbonate), epoxy, rubber, etc., are not sensitive to water vapor.
From the current market demand point of view, more users in the LED full color display waterproof box structure began to have more requirements, began to thin, easy to disassemble the box development, but from a professional point of view, not completely closed, thin and light will certainly be able to play a waterproof effect, just like your computer case, box structure only play a dust-proof, anti-foreign body and other functions, If a large area of water, will certainly cause internal damage, and the space is too small, is not conducive to heat dissipation.
Therefore, the specific protection function of the outdoor full-color LED display depends on the IP level of the factory to decide.
4. Outdoor LED display 10 advanced technical parameters
1. clarity: according to the viewing distance point to determine the required area of the screen body, clarity “40000 pixels/m2; The distance is 5-50 meters; The 16-bit data interface is adopted to further improve the clarity of the picture. When used, the color is vivid, the image is clear, and it can ensure that the LED display has enough brightness and the bright and clear video image when the lamp attenuation exceeds 30%.
Refresh rate: Super 5 type twisted-pair shielded wire and high-performance control IC are used between the processor and the screen body, which can design the high refresh rate of the screen body at ≥1920HZ. To ensure that there is no water ripple and flash when the video is played. In order to ensure the outdoor LED display full digital loss low and anti-electromagnetic interference signal transmission, so the power supply and signal transmission to be technically special treatment.
2,.brightness: the led screen body brightness design is above 5500cd/m2, not only to ensure the normal use of P5 outdoor LED display color lifelike, clear image, but also to ensure that the led display in the case of tube attenuation does not exceed 30% with enough brightness and video image bright and clear.
3.control mode: choose self-designed control system, and 240 hours of uninterrupted power-on aging screening, and then select a highly reliable control system. And in the control mode using double redundant hot backup, once there is a problem immediately by another signal line access, continue to work normally, smooth connection.
4. raw materials: All raw materials of outdoor LED display are selected high-quality products, the main LED lights are selected high-quality led lights;
5.three product aging process: first of all, the automatic production line module for 24 hours of power aging, and then a single box for 48 hours of power aging, simulate the on-site assembly of the finished display for 72 hours of power aging, passed before arriving at the site assembly.
6.Product quality control: All products are manufactured in strict accordance with ISO9001-2000 quality system documents. (See quality certificate), will be strictly in accordance with the waterproof grade IP65 test, to achieve complete waterproof effect. LED outdoor display installation and commissioning: strictly according to the design scheme of the LED display installation and commissioning, the installation level reached C level (LED display installation level).
7.the system software (ready for the screen body re-application) : the operating system adopts WindowsXP and supports the Windows series products provided by Microsoft. All application software is Windows as the operating platform and friendly interface. The player software has rich clock functions. It can display the current date and time. The display clock synchronized with the computer time can be analog clock or digital clock. The software adopts advanced thread technology, which can play text, animation, clock, photo, audio and so on.
8.perfect system function design (ready for screen body re-application) : This system can meet the requirements of assembly, performance, TV broadcast and advertising broadcast. The LED display system of this project has multimedia, multi-channel, real-time transmission of high-speed communication data and video interface, which can easily introduce various forms of information sources into the computer network system to achieve unified control of various audio and video input. The detailed functions are as follows:
9. video playback function can display true color dynamic video images
◇ can high-fidelity broadcast closed-circuit television, satellite TV programs; A variety of video signal input and output interfaces: composite video, Y/C video (S_Video), YpbPr, VGA(RGBHV), DVI, HDMI, SDI(HDSDI);
◇ Can play video programs such as video recorder, dvd player (VCD, DVD, ld) in high fidelity; Has the function of superimposing text, animation and static pictures on the video screen; Real-time editing and playback functions such as panorama, close-up, slow motion and special effects can be realized through editing equipment. Brightness, contrast, saturation and chroma can be adjusted by software with a range of 256 levels; With image freezing function
◇ Video superposition (VGA+Video), image (Video), VGA three display modes
◇ Horizontal/vertical position compensation function; With display synchronization function.
10.computer graphic information play function can display a variety of computer information, text, graphics, drawings and two, three-dimensional animation; Has a rich way to play, display rolling information, notifications, slogans, etc., storage data information capacity. The led outdoor display body can open multiple Windows, display calendar, clock, insert a single line of flowing text. There are a variety of Chinese fonts and font types to choose from, as well as English, Spanish, French, German, Greek, Japanese, Latin, Russian and many other foreign languages. The broadcasting system has multimedia software, which can flexibly input and broadcast a variety of information. There are more than 20 kinds of broadcasting methods, such as left and right rolling, up and down rolling, left and right pushing, up and down pushing, diagonal pushing, diffusion, fan type, rotation, zoom and so on. Through the network connection, the network data information is displayed. Equipped with network interface, can be connected with the computer, share network resources, with standard audio signal output interface to achieve audio and image synchronization.
5. Outdoor LED display compared with LCD display
Outdoor LED display to create more and more advertising value, LED display products have attracted attention, widely used in commercial advertising, live broadcast, traffic guidance, stage interpretation and other fields. In view of these problems, the four points for attention of LED display are summarized.
LED display four advantages
In the outdoor advertising market, LED large screen advertising has become an important media for outdoor advertising communication due to its strong suitability with the target consumer group, strong visual impact and expressive force, flexible advertising update, low cost of thousand people, and large coverage rate of the audience.
Compared with LCD brush screen machine, the advantages of outdoor LED display are mainly reflected in the following points:
1.the area ductility, LCD display area is large, it is difficult to achieve seamless splicing, LED screen can be extended arbitrarily, and achieve seamless splicing.
2.LCD screen luminous flux attenuation is fast, generally run for about a year and a half, it needs to be replaced, but LED video wall under the same operating conditions for at least five years no problem,
3. LED screen brushing machine can use interactive technology to enhance the interaction between the screen brushing machine as an advertising medium and the advertising audience, such as customized touch screen, to achieve cloud technology broadcast control management, etc.
4.In terms of display effect, the high brightness, wide viewing Angle and good color restoration ability of the LED display are also superior to the LCD screen. LED screen brush machine is generally used in airports, shopping malls, hotels, high-speed rail, subway, movie theaters, exhibitions, office buildings, etc., the target customer consumption power is strong, with huge advertising value
6.LED display selection reference
LED production process requirements are very high, and not all enterprises have the corresponding strength, resulting in the quality of LED display on the market is uneven, LED lighting optical system design requirements are very precise, LED tube and condenser cup size are very small, the relative position of the two with high requirements, small deviation, The position of the light to the stage will have a big gap. In order to meet the design requirements, the manufacturer with strict process requirements will screen the consistency of a large number of LED tubes. Taking into account the gap between the thickness of the solder paste of the LED tube on the circuit board, the manufacturer will use an automated laser welding process.
In addition, the heat dissipation problem directly affects the luminous efficiency of LED, the current high quality LED display from the design and process to solve the heat dissipation problem, can have more than 30,000 hours of life, but the design or process of poor LED display may only thousands of hours or even shorter life.
Professional development, design, strict production management, enterprises from the selection of components, materials, from advanced automated operation machinery to the strict quality control of the production process (including the aging of the intermediate components), each link affects the quality of the LED display.
So how to distinguish the quality of LED screen? The following points hope to bring you some inspiration.
- Flatness LED display surface flatness should be within ±1mm, to ensure that the display image does not distort, local convex or concave will lead to the viewing Angle of the display appears dead. The flatness is mainly determined by the production process.
- The brightness of the indoor full color screen should be above 800cd/m2, the brightness of the outdoor full color screen should be above 1500cd/m2, in order to ensure the normal work of the display, otherwise it will be because the brightness is too low and can not see the image displayed, the size of the brightness is mainly determined by the quality of the LED tube core.
The size of the viewing Angle directly determines the number of the display audience, so the larger the better, the size of the viewing Angle is mainly determined by the packaging of the tube core.
- The white balance effect is one of the most important indicators of the display screen, color science when the ratio of red, green and blue three primary colors is 1:4:6:0.16 will show pure white, if the actual proportion is a little deviation will appear white balance deviation, display screen control system to decide, the tube core also has an impact on the color reduction.
Generally, we should pay attention to whether the white is blue, yellowish green phenomenon, the quality of the white balance is mainly by the display
- The reducibility of color refers to the reducibility of the display screen to the color, both the display screen display color should be highly consistent with the color of the playback source, so as to ensure the reality of the image.
- There is no Mosaic, dead point phenomenon Mosaic refers to the small four squares that appear on the display screen and are usually steady or black, both module necrosis phenomenon, the main reason is that the quality of the connector used by the display screen is not up to standard.
Dead point refers to a single point that is usually steady or black on the LED display, and the number of dead points is mainly determined by the quality of the tube core.
- Color block refers to the existence of a more obvious color difference between adjacent modules, the transition of color to the module as a unit: the phenomenon of color blocks is mainly caused by the poor control system, the gray level is not high, and the scanning frequency is low.
7.LED outdoor signs will be affected by many factors, resulting in unsatisfactory display or malfunctioning solutions:
1, power interference:
Interference factors: power supply fluctuation, power supply noise, etc.
Solution: Use stable power supply, and add power filter, voltage regulator and other equipment to reduce the fluctuation and noise of the power supply. Free to teach you LED display power south.
2, signal line interference:
Interference factor: the signal line is subject to electromagnetic interference or crosstalk.
Solution: Use a signal line with good shielding performance, and keep the distance between the signal line and the power line to reduce electromagnetic interference. If conditions permit, you can use optical fiber to transmit signal signal line interference.
3, temperature interference:
Interference factors: The temperature is too high or too low, resulting in abnormal work of the LED display.
Solution: Ensure that the ventilation of the LED display is good to avoid overheating. In a cold environment, you can use a heating device to maintain the normal operating temperature of the display. 4, environmental light interference:
Interference factors: strong ambient light exposure leads to unclear display content.
Solution: Adjust the brightness and contrast of the display screen, so that it can adapt to the intensity of the ambient light, while choosing the appropriate display installation position.
5, electromagnetic interference:
Interference factor: Electromagnetic radiation generated by nearby devices interferes with the display screen.
Solution: Increase shielding measures, such as metal shielding, to reduce the impact of electromagnetic radiation on the LED display.
6, data transmission interference:
Interference factors: interference on the data transmission line leads to data transmission errors.
Solution: Using differential signal transmission, adding data error correction code and other technologies to improve the reliability of data transmission.
7, ground interference:
Interference factors: poor grounding leads to signal interference.
Solution: Ensure a good ground connection to avoid interference from the ground circuit.
8, electrostatic interference:
Interference factors: static electricity may cause damage to the LED display.
Solution: Use anti-static measures, such as adding static protection devices and static elimination devices, to ensure that the display works properly.
The comprehensive application of the above solution can effectively reduce the signal interference of the LED display screen and ensure the stability and good display effect. If you still encounter professional LED display maintenance services under special circumstances.
8.Outdoor LED display in the process of use, it is inevitable that there will be bad lights, local black screens and other imagination, generally because there is a problem on the LED display module.
Outdoor LED display module failure and solutions:
Led screen module is broken how to do? Five common outdoor LED display module failure maintenance methods
1, LED display group continuous not bright or abnormal:
This phenomenon usually leads to a large area of LED display black screen phenomenon
1.Check the signal direction of the first abnormal module of the cable and power line contact is good, such as module no LED display bright, it indicates that there is no power input, please check the power part (can be checked by a multimeter), such as the appearance of color (there is a bright spot of color confusion) it indicates that the module has no signal input, please check whether the input end of the first abnormal module of the cable contact is close, Can be unplugged several times test, such as the problem can still be replaced with a new row of wires
2.Replace the bad LED light beads (out of control point) on the LED display screen:
After the single light detection to confirm the LED damage, according to the actual needs, selective use of the following maintenance methods
2-1 front maintenance: Use the corresponding type of screwdriver to remove the fixed mask screw from the front (pay attention to keep the screw), remove the mask, and replace the lamp (please change the lamp according to the following method), after the lamp change and colloidal seal, restore the original mask, tighten the screw (please pay attention not to press the lamp when the screw is on), and finally, if there is colloidal residue on the surface of the LED display, please carefully remove the colloidal.
2-2 Maintenance on the back: Use the corresponding type of screwdriver to remove the screw from the back (pay attention to keep the screw well), remove the signal bar cable, do not remove the power cable for safety, to prevent accidents, carefully remove the module from the sheet metal hole, move to the back of the box, and then according to the front maintenance method of the single module to maintain the lamp (please change the lamp according to the following method of changing the lamp) or overhaul other.
- Change the lamp
The colloids around the damaged LED display are removed with sharp tools (such as tweezers), and the LED pins are clearly exposed in the line of sight, the right hand holds the LED display with tweezers, the left hand uses a soldering iron (the temperature is about 40 degrees, too high temperature will cause damage to the LED display) contact the solder, and do a little stay (not more than 3 seconds, If more than time but do not meet the disassembly requirements, please cool down and try again) will melt the solder, with tweezers to remove the LED display.
Insert the LED lamp bead of the correct model of the LED display that meets the requirements into the hole of the PCB circuit board, (the long foot of the LED lamp is the positive electrode, the short foot is the negative electrode, the “square hole” on the PCB is the LED positive pin jack, the “round hole” is the LED negative pin jack), melt a little solder wire and glue it on the soldering iron head. Adjust the direction of the LED display with tweezers to make it smooth, weld the solder to the LED and PCB connection, and seal the LED display with the same type of colloid (PH =7).
- Change the IC, if there is a constant color block on the outdoor LED module, you can determine the IC on the circuit board is broken. Need to replace the IC in time.