The quality of a full-color led display can be mainly from the following aspects to sign:
1. Flatness
Surface flatness of the display to within ± 1mm, in order to ensure the display image is not distorted, partial raised or recessed will lead to the display viewing angle appears dead. The quality of flatness is determined mainly by the production process.
2. Brightness and viewing angle
Indoor full color brightness to the 800cd / m2 or more, outdoor brightness full color to the 1500cd / m2 or more, to ensure the normal operation of the display, otherwise it will be too low and can not see because of the brightness of the displayed image. The size of the brightness of the LED die is good or bad decision.
How much screen size of the viewing audience directly depends on the angle, and therefore the bigger the better. The size of the viewing angle from the die is encapsulated to decide.
3. The balance effect
White balance is one of the most important indicators of the display. Red, green and blue color science taken in the ratio of 1: 4.6: 0.16 pure white will show, if the actual proportion of any deviation occurs the white balance bias, usually pay attention to whether there are bluish white, yellow green phenomenon. White balance is mainly determined by the quality of the display control system, die on the reduction of color also have an impact.
The color reduction
Color reduction refers to the color display of color reduction, both display height should be consistent with the color of the playback source, so as to ensure realistic images.
5. Have mosaics, dead phenomenon
Mosaic refers to appears on the display lit or normally black small four-square, both modules necrosis, connector quality mainly used for the display, but off.
Dead point is steady appear on the display or normally black single point, how good or bad from the die to determine the dead point.
6. Have color
Color refers to the existence of obvious color difference between adjacent modules, transition colors in module units, the color phenomenon is mainly caused by the control system is poor, the gray level is not high, low scanning frequency caused.