The LED display is an important new type of flat panel displays, due to its high brightness, clear picture quality, colorful, make it display in a public multimedia field thriving, a lot of billboards, movie billboards will be designed for LED lights display, vehicle led bulbs, so a huge market space. When we judge a full-color display screen is good or bad, mainly to assess from the following aspects:
1 Consistency
LED full-color screen, better consistency, the entire screen brightness should be balanced, no obvious color.
2. Dead pixels
Dead pixels is not greater than 0.03% in the indoor LED displays, outdoor LED street light screen, dead pixels should be less than 0.3%, and for the discrete-like.
3, Security
No security risks, leakage current and ground leakage current shall not exceed 3.5mA (AC RMS); anti-point intensity.
4 Appearance
The LED display frame no scratches. Outdoor LED display screen pixel pipe installation should be consistent, no loose shell and tube rupture phenomenon?
5 Structure
LED display part can be steel, aluminum, wood and other materials, the requirements of the rugged and beautiful.
6. Flatness
vehicle led bulbs, Display screen surface flatness to within ± 1mm to ensure that the displayed image is not distorted, locally raised or recessed cause the display viewing angle of dead ends.
7. Brightness and viewing angle
Indoor full color display brightness to 800cd / m² or more, the outdoor full color display brightness 1500 cd / m² or more, in order to ensure the normal work of the display, otherwise it will be because the brightness is too low and can not see the show images.Directly determine the size of the viewing angle display screen audience, and therefore the bigger the better. The size of the viewing angle is mainly determined by the die package.
8 whether the mosaic, dead phenomenon
Mosaic is appears on the display lit or normally black box, that is, modules necrosis, mainly due to the connectors for the display quality, but off. Dead appears on the display lit or normally black single point of vehicle led bulbs, the point of death, how much to determine the die is good or bad.
9 with or without color in LED Products
Color is more obvious color difference between adjacent modules, the color of the transition module, cause the color phenomenon is caused by poor control system, the gray level is not high, low scanning frequency the.