One, life 100 thousand hours
Issued technical data makes clear LED material manufacturer the life of LED illuminant issues 1O 10 thousand hours for good position. Good position shows in the lab condition of constant voltage constant current leaves the time that LED illuminant goes to not to give off light completely from glow, 1O 10 thousand hours of amount to 11 years.
More or less is of the Cheng Shui of a cask decide by lowermost board, LED shows what screen uses at present to be civilian the parts of an apparatus that tastes level, service life does not exceed 8 years. The function that serves as indication screen is to watch, when only ability sees well in the evening, shining when indication screen is inexplicability it is eligible, have use value.
A car can leave 15 years, if unused discard as useless 3 years. Use environment and method are very old to the life influence of the product.
2, abide by GB
LED indication screen is general and normative promulgate for the ministry 1995 standard. Still have a lot of companies up to now so-called accord with national level, see the level at that time 8 when develop in science and technology years again later, not be a standard any more. Say out of control is nodded for example, GB is extremely, with φ 3.75 indoor double base lubricious indication screen is exemple. The indication screen that makes 640x480 standard resolution commonly is 7 smooth rice, every make the same score rice to be 43264 a little bit, press GB to be able to have place of 90 out of control. Such indication screen is in who still buys sheet today.
3, software is completely free
The common fault that indication screen industry puts generally in course of study of the state-owend enterprise in the move -- produce only not research and development. Only at present a few enterprise has original software. Using pilfer edition now break the law.
4, the price is low
Should see performance/price ratio and not be pure see the value.
5, gray scale grade
As double base the gray scale of indication screen of color and complete color is a main index. The indication screen that there are a lot of 16 classes and 64 classes gray scale on the market at present pretends to be 256 class gray scale. Its control cost to have the pilot 1/5 of 256 class gray scale only. The simplest method is to broadcast the VCD of a more intense campaign appearance to examine LED to show to whether can see well on screen.
6, should buy be about best
All purchasing power originate need, satisfy need and have certain lead. Blind pursuit bought wasteful very much fund the function that he does not need.