Full color LED display quality judgment standard

1.Smoothness

LED display surface roughness to within ± 1mm to ensure that the display image does not occur distorted, local highlights or recession will lead to LED display viewing angle of the dead angle. The degree of flatness is determined by the production process.

2. Brightness and viewing angle

Indoor full color LED display brightness to 800cd / m2 above, outdoor full color LED display brightness to 1500cd / m2 or more, in order to ensure the normal work of the display, otherwise it will be too bright because the brightness is not clear display Image. The brightness of the size of the LED die is mainly determined by the good or bad.

The size of the visual angle directly determine the number of LED display audience, so the bigger the better. The viewing angle is mainly determined by the way the die is encapsulated.

3. White balance effect

White balance effect is one of the most important indicators of LED display. Color when the red, green and blue primary colors ratio of 1: 4.6: 0.16 will show a pure white, if the actual ratio of a little deviation will appear white balance deviation, generally have to pay attention to whether the white blue, partial Yellow-green phenomenon. White balance is mainly determined by the control system to determine the screen, the color of the reductive also affected.

4. The reduction of color

Color reduction is the LED display on the color of the reduction, both the display screen to play with the color of the source to maintain a high degree of consistency, so as to ensure the image of the realism.

5. whether the mosaic, dead phenomenon

Mosaic refers to the LED display on the bright or often black small square box, both the module necrosis, the main reason for the LED display used by the connector quality is not related.

Death point refers to the LED display on the bright or often black single point, the number of dead spots mainly by the die is good or bad to decide.

6. No color blocks

Color block is a significant difference between adjacent modules, the color of the transition to the module as a unit, causing the color phenomenon is mainly due to poor control system, gray level is not high, the scanning frequency caused by low.