|How to buy a good LED display wall?|
In recent years, the demand for LED large screens has soared, causing various large and small factories to mushroom up. In the meantime, each family said that they are good at home, customers are difficult to distinguish ugly, and most of them are price-oriented. But as the saying goes, buyers are not as good as sellers, generally referring to how buyers are savvy to price, to ask sellers, but it is still difficult to savvy sellers, so that sellers account for the cheap. The result is that like the 500,000 BMW did not buy but bought 300,000 Jetta.
However, as a LED panel manufacturer with integrity, the important information in the industry should be told to the buyer in advance for them to choose, without information asymmetry.
After the development of these years, the LED full-color large screen seems to be a mature industry. In fact, whether it is domestic or foreign manufacturers, there is still a long way to go, especially for outdoor large screens. After most of the products have been in operation for two years. It is difficult to maintain the user's expectations.
Why is this so?
There is a big misunderstanding here. Most people think that the main materials of the screen are LED and IC life of 100,000 hours. It runs at 365 days/year and 24 hours/day. The service life is more than 11 years, so most customers only care about it. Use well-known LEDs and ICs. In fact, these two are only necessary conditions, not sufficient conditions, because the reasonable use of three types of red, green and blue lamps is more important for the display. For lamps of different colors, it is necessary to make it work at its best. A good display will be more important. The reasonable adjustment of the IC also helps to overcome the unreasonable wiring problem of the PCB. Just as a car has good engine and circuit control, it may not be a good car. The key factor here is this:
Since LEDs and ICs are semiconductor devices, they are critical to the environmental conditions, preferably at room temperature of about 25 ° C, and have the best working mechanism. But in fact, a large outdoor screen will be used in different temperature environments, summer may be above 60 °C, winter may be below -20 °C. When the manufacturer produces the product, it is based on 25 °C as the test condition, and the different products are classified into different files. The actual operating conditions are 60 °C or -20 °C. At this time, the LED and IC work efficiency and performance are inconsistent, which may belong to the first gear. It will become a multi-file, the brightness will be inconsistent, and the screen will naturally change. This is because the red, green and blue lamps have different brightness attenuation and decrease under different temperature conditions. At 25 ° C, the white balance is normal, but at 60 ° C, three colors of LED The brightness is reduced, and the attenuation values are inconsistent, so the brightness of the entire screen is reduced and the color cast is lost, and the quality of the entire screen is degraded. And what about IC? The IC's operating temperature range is from -40 ° C to 85 ° C. Because the outside temperature is too high, the temperature inside the box rises. If the temperature inside the box exceeds 85 °C, the IC will be unstable due to excessive temperature, or the temperature drift will be different and the current between the channels or the difference between the sheets will be too large. Lead to the flower screen.
At the same time, the power supply is also very important. Because the power supply is under different temperature conditions, its working stability, output voltage value and load capacity will be different. Because it is responsible for logistics support, its support capability directly affects The quality of the screen.
The design of the cabinet is also very important for the display screen. On the one hand, it is the circuit protection function, on the other hand, it is a safety function, and at the same time, it is also dustproof and waterproof. But more importantly, the design of the thermal circuit system for ventilation and heat dissipation is good. As the startup time increases and the external temperature increases, the thermal drift of the components also increases, resulting in poor image quality.
All of these factors are interrelated and affect the quality and longevity of the display. Therefore, when selecting screens, customers should also comprehensively observe and analyze and make correct judgments.
The effect of temperature on the large screen is not only the case. It is assumed that the customer has purchased a large screen with a width of 10 meters and a height of 6 meters (60 square meters). Although the total area is not large, the internal composition is the individual unit boxes, between the unit boxes. The temperature is not necessarily balanced, the temperature inside the box is also affected by the air convection and the temperature is inconsistent, resulting in different temperatures between the unit boxes or inside the unit case, resulting in inconsistent working efficiency of the semiconductor device, thus showing the illumination of the LED lamp The brightness is inconsistent and looks like a "flower" screen. Don't underestimate the outdoor temperature. Just think about the example of cooking eggs in a car in the summer. What's more, the LED display should still be illuminated after the summer exposure. (The emitted light is stronger than the sunlight), and its light will be hot. These are the influencing factors.
Fighting against hot and cold temperatures, not only fragile LEDs, ICs and other semiconductor devices, but also sturdy ABS, masks, iron boxes, connectors, all kinds of solder joints, masks are exposed to sunlight and low temperature after the rain Under the multiple pinch of gas, the partial deformation angle is as high as 2-3mm, and the ultraviolet irradiation also changes the color of the mask plate. Under the various climate changes of the year, the mask plate seen by the audience itself will change color. The slab, the deformation will block the illuminating angle of the illuminating tube to produce a dark area of light; the deformation will also affect the bending of the PCB, resulting in the solder joint not being secure, resulting in a solder joint that causes the LED to illuminate. Moreover, due to the moisture and oxidation of the air, the oxidized contact surface of the connector is reduced, and with the slight influence of vibration and deformation, the micro-scale plating of the connector does not form a tight contact, resulting in a signal or power interruption, and the large screen is faulty.
Deformation and mechanical fatigue can also affect the iron box and the outer frame, resulting in unevenness of the screen body, the module and the iron box can not be tightly matched, and some water leakage and other consequences.
Therefore, to choose a good large screen, the first line must choose a good light tube, durable and adaptable, and must not be underestimated for other materials and process evaluation, just like a car, a few people's repair shop, can also piece together A car, a factory of tens of thousands of people is also assembling a car, the number of kilometers and the guarantee factor of the car should be far apart. The waterproof and anti-deformation of the outdoor screen, the processing technology and the key accessories are the same, and the difference is a thousand miles.
In addition to the quality of the main components such as LEDs and ICs, it is also important to communicate with the seller beforehand. It not only directly affects the quality, success or failure of the entire project, but also allows users to allocate the resources more rationally, avoid unnecessary waste, loss and hidden dangers, and even increase considerable profits.
Manufacturers should also actively provide simulation solutions or better proposals for users on actual needs and operability, to help customers rationally analyze, plan, and make the most cost-effective solutions, in order to become a reliable partner for users. Communication matters generally include the following:
1. Clarify your own needs, budget and expected results;
2. Explain in detail the demand for the project and the future development plan, requiring the seller to provide the best implementation plan, even the project's expandable functions and expand the budget and plan to avoid unnecessary problems caused by the project not suitable for future development needs. Waste of resources;
3. Provide or require the manufacturer to analyze the project installation and application environment, predict the incidents and propose preventive and corrective measures, and then make a comprehensive assessment of the entire project plan;
4. Different LED production processes, screen assembly processes and installation technology experience will directly affect the construction period, cost, safety performance, display effect and quality, service life and maintenance cost of the entire project. Therefore, it must be known from the manufacturer or in many aspects beforehand. Compare the performance characteristics of products and projects in all aspects, and choose the solution that best suits your needs;
5. Understand the strength, integrity, service content and quality of the manufacturers. These are the basis and guarantee for the good and long-term cooperation of the project.
Clearly understand the consumption, easy to use, I wish every customer who needs a large screen, can buy a product that they are satisfied with, and also wish the big screen display industry in the constant demand of users, go to the poor, and achieve A higher quality level.