How to buy a good Led
display from industry situation and now shows itself characteristics analysis.
Let you buy screen has well prepared.
LED large screen surge in demand in recent years, resulting in various factories have growth, said in a flash all their good, resembles the customer good ugly, and mostly price oriented.
But as the saying goes, buyers than sellers, generally refers to how smart buyers to demand, to ask the seller, but also difficult to savvy sellers, let the seller account for cheap.
Results like five hundred thousand BMW didn't buy it bought three hundred thousand jetta.
Small make up, however, as a manufacturer with good faith, will tell the important information within the industry prior to buyer, for them to choose, no information asymmetry.
Full-color LED large screen after these years of development, has rough look into mature industry, in fact, both domestic and foreign manufacturers, is still a long way, especially outdoor large screen, most of the products after two years of operation, it is difficult to keep within the expectations of users.
Why is this so?
First of all, there was a huge mistake here, most people think that the main material of the LED screen, IC life 100000 hours, 365 days per year, 24 hours/days running, service life is more than 11 years, so most of the customers only care about with well-known LED and IC.
Actually both was necessary, rather than sufficient conditions, because red, green, blue three kinds of the rational use of the tubes, more important, to display to the tubes of different colors, to make it work in the best condition, for a good display will be more important.
Reasonable regulation of IC, also helps to overcome the unreasonable PCB wiring problem.
Like a car with a good engine and circuit control, not necessarily can become a good car.
Here is the key factor is this: because LED, IC are semiconductor devices, they are critical of the use of environmental requirements, best at room temperature 25 ℃ or so, its working mechanism is the best.
This is because under the condition of different temperatures, red, green, blue three kinds of the brightness of the light attenuation and drop is different, at 25 ℃, the white balance is normal, but at 60 ℃, the three colors of the brightness of the leds are decreased, and the attenuation values are not consistent, so will produce the whole screen brightness decline and the phenomenon of partial color, the quality of the whole screen will drop.
The IC?
Working temperature range is in - IC
40℃—
85℃。
Due to ambient temperature is too high the casing temperature, if the temperature over 85 ℃, IC, because temperature is too high, cause of the work is not stable, or the channel between current extraction and temperature drift or caused by too much difference between flowers screen.
At the same time, the power supply is also very important, because the power under the condition of different temperatures, the working stability, output voltage and load capacity will also be different, because it's for the logistics function, therefore its ability to directly affect the quality of the screen.
Cabinet design for the display screen is also very important, on the one hand, it is the circuit protection, on the other hand is a safe, as well as dustproof and waterproof effect.
But more important is whether the ventilation cooling system of hot circuit design is good, with the increase of boot time and outside temperature, the components of the thermal drift also increases, resulting in image quality becomes poor.
These factors are interrelated, will affect the display quality and longevity.
So customers in the selection screen, also want to comprehensive observation analysis, make the right judgment.
The effects of temperature on screen is not only that, assume that the customer bought a 10 m wide 6 meters high,
60 square meters)
Total area of the screen, although is not big, but the internal composition is each unit box, box temperature does not necessarily equilibrium between each unit, the casing temperature will also be affected by air convection and temperature, lead to unit between the box body, the temperature inside the box body or unit, a semiconductor device efficiency, so as to show the leds luminous intensity inconsistencies, look 'flower' screen.
Don't look down upon outdoor temperature, you just think about the summer in the car can be boiled eggs example too clear.
Besides the LED display screen should be displayed under the summer sun will shine.
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