In recent years, demand for large LED screens has soared, resulting in a mushrooming of factories of all sizes, all of a sudden saying they are good, customers are hard to tell, and most of them are price-oriented. But as the saying goes, buyers are not as good as sellers, basically refers to how smart buyers to pressure prices, to ask sellers, but also difficult to smart sellers, let sellers take advantage of. It's like buying a $300,000 Jetta instead of a $500,000 BMW.
However, as an honest manufacturer, we should inform the buyers of important information in the industry in advance, so that they can choose, and do not engage in information asymmetry.

LED full-color large screen after the development of the past few years, it seems to have been a mature industry, in fact, whether domestic or foreign manufacturers, is still a long way to go, especially outdoor large screen, the vast majority of products after two years of operation, it is difficult to maintain in the user's expectations.

Why is that?

Here first there is a big misunderstanding, most people think that the main material of the screen LED, IC life has reached 100,000 hours, according to 365 days/year, 24 hours/day operation, service life has more than 11 years, so most customers only care about the use of well-known LED and IC. In fact, these two are only necessary conditions, rather than sufficient conditions, because the reasonable use of red, green, blue three kinds of tubes, more important to the display, for different colors of tubes, to make it work in the best state, for a good display will be more important. The reasonable adjustment of IC also helps to overcome the unreasonable wiring problem of PCB. Just as a car with a good engine and circuit control does not necessarily make a good car. Here are the key factors:

As LED and IC belong to semiconductor devices, they are picky about the use of environmental conditions, the best room temperature about 25℃, its working mechanism is the best. But in fact a large outdoor screen will be used in different temperatures, which may be above 60℃ in summer and below -20℃ in winter. When the manufacturer produces products with 25℃ as the test conditions, the classification of different products, but the actual operation conditions of 60℃ or -20℃, then LED, IC work efficiency and performance is inconsistent, may originally belong to a file will become a multi-file, brightness is inconsistent, screen body also naturally changed flower. This is because in different temperature conditions, red, green, blue three kinds of lamp brightness attenuation and decline is different, at 25℃, the white balance is normal, but at 60℃, the brightness of the three colors of LED decreased, and its attenuation value is inconsistent, so will produce the whole screen brightness decline and color bias phenomenon, the quality of the whole screen will decline. And IC? The operating temperature range of IC is -40℃ - 85℃. Due to the outside temperature is too high and lead to the temperature rise in the box, if the temperature in the box exceeds 85℃, IC will be due to the temperature is too high and lead to instability, or temperature drift and different between the channel current or sheet difference is too large and lead to flower screen.

At the same time, the power supply is also very important, because the power supply under different temperature conditions, its working stability, output voltage value and load capacity will be different, because it bears the role of logistics support, so its support ability directly affects the quality of the screen.

Box design is also very important for the display screen, on the one hand is its circuit protection, on the other hand is the safety role, as well as dust-proof, waterproof effect. But more important is whether the design of the heat loop system of ventilation and heat dissipation is good. With the extension of the boot time and the increase of the external temperature, the thermal drift of the components will also increase, resulting in poor image quality.

All of these factors are interrelated and affect the quality and longevity of the display. So the customer in the screen selection, but also to comprehensive observation and analysis, to make a correct judgment.

The influence of temperature on the screen is not only that, assuming the customer bought a 10 meters wide 6 meters (60 square meters) of the screen, although the total area is not big, but the internal composition is each unit box, the temperature between each unit box is not necessarily balanced, the temperature inside the box will also be affected by air convection and temperature inconsistency, resulting in the unit box, Or the internal temperature of the unit box is not the same, which brings the working efficiency of the semiconductor device is inconsistent, which is manifested as the luminance of the LED lamp is inconsistent, and looks like the "flower" screen. Don't underestimate the outdoor temperature. Just think of hard-boiled eggs in cars in the summer. In addition, the LED display should still glow in the summer sun. (the light emitted is more effective than the sun's), and its light must be heated, which are all factors.

And hot and cold temperature struggle not only fragile LED, IC and other semiconductor devices, but also including solid ABS, face mask, iron box, connectors, all kinds of welding points, face mask in the sun exposure and low temperature scraping and freezing after rain moisture under the multiple clamping, partial deformation Angle up to 2-3mm, the other ultraviolet irradiation also makes the mask plate color change, In this way, under a variety of climate changes in a year, the mask plate seen by the audience will change color, there are spots, deformation will block the luminous Angle of the light tube to produce dark areas; Deformation will also affect the curvature of PCB board, resulting in unstable welding points, resulting in virtual welding that makes LED light on and off. In addition, due to the moisture and oxidation of the air, the oxidation contact surface of the connector is reduced. Coupled with the slight influence of vibration and deformation, the micron level coating of the connector does not form tight contact, resulting in signal or power interruption and the failure of the large screen.

Deformation and mechanical fatigue will also affect the iron box and the outer frame, resulting in uneven screen body, mold and iron box can not fit tightly, partial water leakage and other consequences.

Therefore, to choose a good screen, the first line must choose a good tube, durable adaptability, and other materials and process assessment must not be underestimated, just like the car, a few people's repair shop, can also piece together a car, tens of thousands of people in the factory is assembling a car, but the number of miles of the car and the guarantee coefficient should be very far away. Outdoor screen waterproof anti deformation, processing technology and key accessories, miss is as good as a thousand miles.

In addition to considering the quality of major components such as LED and IC, prior communication with the seller is also very important. It not only directly affects the quality of the whole project, success or failure, but also often enables users to allocate resources more reasonably, avoid unnecessary waste, losses and hidden dangers, and even increase considerable earnings.

Manufacturers should also take the initiative to provide users with simulation schemes or better suggestions on actual needs and operability, help customers with reasonable analysis and planning, and make the most cost-effective scheme, in order to become users' trusted partner. Communication matters generally include the following points:

1, clear their own needs, investment budget and expected best results;

2. Specify the demand for the project and the future development plan in detail, and ask the seller to provide the best implementation plan, even the project's extendable functions and expansion budget and plan, so as to avoid unnecessary waste of resources caused by the project not suitable for the future development needs;

3. Provide or request the manufacturer to analyze the installation and application environment of the project, predict and propose prevention and solution measures for the occurrence of the project, and then make a comprehensive evaluation of the whole project plan;

4, different LED production process, screen assembly process, installation technology experience, will directly affect the project duration, cost, safety performance, display effect and quality, service life and maintenance costs, so must be from the manufacturer or many aspects of understanding, compare the performance characteristics of the product and project in all aspects, choose the most suitable for their needs;

5. Understand the strength, integrity, service content and quality of the manufacturer, which are the basis and guarantee of good and long-term cooperation of the project.

Clearly to consumption, easy to use, I wish every need to use large screen customers, can buy a satisfactory product, but also wish the large screen display industry in the user's continuous requirements, to inferior and excellent, to achieve a higher level of quality.