Flatness
The surface roughness of the display should be within ± 1mm to ensure that the displayed image does not distort, and the local bulge or recess will cause the viewing angle of the display to appear dead. The degree of flatness is determined by the production process.
2. Brightness and viewing angle
Indoor full color of the brightness to 800cd / m2 or more, outdoor full color brightness to 1500cd / m2 or more, in order to ensure the normal work of the display, otherwise because the brightness is too low to see the displayed image. The brightness of the size of the LED die is mainly determined by the good or bad.
The size of the viewing angle directly determines the number of display screen 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 the display. Color when the red, green and blue three primary colors ratio of 1: 4.6: 0.16 will show a pure white, if the actual ratio of a slight deviation will appear white balance deviation, the general attention to whether the white blue, 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 display of 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 display appears on the bright or often black small squares, both module necrosis, the main reason for the display screen used by the quality of the connector, but off.
Dead point refers to the display appears 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 refers to the adjacent module there is a significant difference between the color, the color of the transition to the module as a unit, causing the color phenomenon is mainly by the control system is poor, gray level is not high, the scanning frequency caused by low.