Let's talk about characteristics influencing the quality of LED screens and signs.
LED screen brightness, contrast and color palette support
These characteristics are important first of all if it is planned to use an outdoor LED screen and signs in daytime.
If it is impossible to prevent the LED screen from direct sunbeams.
In this case you should choose a system with brightness of no less than 8 000 cd/m2 and even 12 000 cd/m2. But if the outdoor screen does not face direct sunbeams (for example it is installed on a porch of a building, and the building protects it from the sun), the digital screen brightness of 5 000 cd/m2 could be enough.
Digital outdoor screen resolution
It is a very interesting technical criterion. Our eyes can’t perceive and apprehend small type (even if the resolution of the digital screen is the greatest) even from a distance of optimum recognition. The linear size of the outdoor screen or sign will be so small that you need to have better than normal eyesight or use binoculars to see at least something. Thus, you will simply waste your money.
Besides, it is necessary to take into account one more purely technical detail. All signs and screens as newest lamp or LED or plasma displays are digital initially, and any television signal - PAL, SECAM with 240-320 lines - is analog, not digital. Even some engineers mix these things up. Therefore there appeared such a concept as “sufficient resolution” - about 160x120 pixels - which allows you to transfer the majority of TV signals.
I.e. the better is the resolution of the large outdoor digital sign or screen, the less work is spent on transformation and the better is the quality. On the other hand, if it is 100 000 or 500 000$ more for you, maybe it is reasonable to limit your demands with “sufficient” or even smaller resolution. It is proved on practice (Moscow, Omsk, Novosibirsk) that it is quite possible to work even with resolutions of 120x90 or 80x60. Linear sizes, the area of vision and the scope of the audience are much more important for getting advertising tenders. But still optimal resolution of digital outdoor screen should be 160x120 pixels.
Operational and climatic characteristics and modes of operation of the outdoor digital screens
· Repair ability. It is a main characteristic. It is very important in Russia and CIS whether there is a service center or company that can make repairs or replace parts (as Western companies provide guarantees for everything). Therefore it is necessary to notice not only who guarantees what, but also how these guarantees are carried out. Thus it is better if the operating of the electronic screen is not so complicated and if the screen is quite repairable. Do not turn advertizing business into engineering research.
· Working temperature. It is better in Russia and the countries of CIS if the working temperature varies from -50 to +50°C.
· 24/7 working mode. It is optional, but if the digital outdoor screen is reliable and repairable, then it usually provides this mode also. The digital screen should consist of modules and should be mobile for sports, cultural and political campaigns. The outdoor digital screen must have direct video broadcasting mode for sports, cultural, political campaigns.
Now, as we stated providing the basic characteristics, we can choose among various types of digital outdoor screens taking into account price criteria applying to specific place and situation. It is necessary to find a compromise between the linear sizes, brightness, “sufficient resolution” and the type and cost of the whole digital outdoor advertising system. Thus it is necessary to take into account the upgrade ability of a system. I.e. is it possible to begin with one type (for example not so expensive for a certain linear size, but having insufficient resolution), and then in due course (in one or two years), to upgrade it (for example, only the electronic part) to more accomplished?