Help you Misunderstanding teach you how to buy a good LED display

In recent years the demand increase Meng LED big screen, (Xi'an LED display of the total distribution company 13,572,469,943) resulting mushrooming growth of plants of various sizes, each said their own good instant customer difficile ugly, but mostly price-oriented. But not as good as the saying goes, buyers sellers fine, generally refers to how smart buyers to keep the prices down, to ask the seller, the seller still too difficult to smart, let the seller an advantage. Results like BMW did not buy half a million three hundred thousand to buy a Jetta. However, as one of the integrity of the manufacturer, should be important information within the industry have told buyers for their choice not to engage in information asymmetry. LED full-color large screen after years of development, at first glance seems to have a mature industry, in fact, whether domestic or foreign manufacturers, is still long way to go, especially outdoor big screen, most of the products after two years of operation , it is difficult to maintain in the expectations of the user. Why is this so? First, there is a big misunderstanding here, most people believe that the main material LED screen, IC life have reached 100,000 hours, 365 days / year, 24 hours / day operation, the service life of 11 years, so most customers only care about with well-known LED and IC. In fact, these two conditions is a necessary, but not sufficient condition, because the rational use of red, green, and blue lamp, more important to display different colors for the lamp to make it work in the best condition, for a good display will be more important. IC reasonable adjustment, but also help to overcome the irrational PCB routing problem. As if a car with a good engine and circuit control, does not necessarily become a good car. The key factor there is this: As the LED, IC are semiconductor devices, their environmental requirements for critical conditions, preferably at about room temperature 25 ℃, the best working mechanism. But in fact a large outdoor screens will be applied at different temperatures in the summer may be more than 60 ℃, winter may be below -20 ℃. When the manufacturers of products based on 25 ℃ as the test conditions, the classification of different product sub-file, the fact that operating conditions of 60 ℃ or -20 ℃, then inconsistent LED, IC efficiency and performance, may originally belonging to a file will become a multi-speed, brightness inconsistent screen body will naturally become spent. This is because under different temperature conditions, red, green, and blue light brightness decay and fall is different, at 25 ℃, the white balance is normal, but at 60 ℃, three color LED The brightness has decreased, and the attenuation values ??do not match, so the entire screen brightness will have dropped and the color cast of the phenomenon, the entire screen quality will drop. The IC it? IC's operating temperature range is -40 ℃ -85 ℃. Because the outside temperature is too high and lead to the cabinets temperature, if the inside temperature exceeds 85 ℃, IC is because the temperature is too high and lead to job insecurity, or drift arising between different channel current or tablets difference between too large resulting in the video. Meanwhile, the power supply is also very important, because the power under different temperature conditions, the job stability, output voltage and load capacity will be different, because it bears a logistical role, so its direct impact on the security capability quality screens. Cabinet design is also very important for the display, one is its circuit protection, on the other hand is your safety, as well as dust-proof, waterproof. But more important is the thermal loop ventilation system design is good, with the power to extend the time and outside temperature, the thermal drift components will increase, resulting in deterioration of image quality. These factors are interrelated, it will affect the display quality and life. So when customers choose the screen, but also a comprehensive observation and analysis to make the right judgments. Effect of temperature on the big screen not only that, assuming the customer bought a 10-meter wide and six meters (60 square meters) of large-screen, although the total area is small, but the internal composition of each unit box between each unit box temperature is not necessarily balanced by the air flow cabinets temperature will affect the temperature is inconsistent between the unit cabinet or cause the temperature inside the housing unit is not the same, bringing the efficiency of semiconductor devices are inconsistent, thus the performance of LED light emitting brightness inconsistent, looks "flower" screen. Do not underestimate the outdoor temperature, as long as you think of summer in the car example can be cooked eggs can imagine. Moreover, LED display to display still under exposure in the summer light. (Stronger than the light emitted by the sun to be effective), the luminous will certainly heat, these are all factors. And hot and cold temperatures to fight not only the fragile squeamish LED, IC and other semiconductor devices, including solid ABS, masks, metal box, connectors, various types of welding points, mask exposure in the sun and cold rain wet shave frozen Multiple gas under attack, and deformed part Qiaojiao up to 2-3mm, another ultraviolet irradiation also masks the color change board, so a year under a variety of climate change, the audience can see the mask plate itself will change, there are spot plate, deformation will block cover emitting angle of the arc tube produce light dark areas; deformation also affects the curvature of PCB board, resulting in solder joints is not solid, generated when the light off when Weld makes the LED. And due to moisture and oxidation resulting in reduced air connector contact oxidation surface, plus the subtle influence of vibration and deformation, connectors micron coating did not form close contacts, resulting in signal or power interruptions, a large screen failure. This paper from China LED display network http://www.led8.com/news/customer_buy/2008/416/ Yi Lu Zero One One wantonly eight three one three D II II Jiu Jiu Lu Qi KB6C46EEAIDGA.html