1. Flatness The surface flatness of the display should be within ± 1mm to ensure that the displayed image does not distort, and that the local protrusion 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 5500cd / m2 or more, in order to ensure the normal work of the display, otherwise it will be because the brightness is too low to see the Display the image. The brightness of the size of the led tube is 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. LED display white balance effect White balance effect is one of the most important indicators of the 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 proportion of a slight deviation will appear white balance deviation, generally pay 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 have an impact.
4. Red color reduction of LED color color reproduction refers to the 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 that the image of the realism that is consistent with the natural color, To ensure the effect of realistic.
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 is the display screen 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. Whether the color block color block is adjacent to the module there is a significant difference between 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, scanning The frequency is low.
7. blind spot rate control: blind spot rate is usually a bright spot, dead point, dark spots, outdoor screen blind spot rate is less than 3 million, the indoor screen blind rate to control in two thousandths.