1. Surface flatness: in accordance with the conventional standard surface roughness to within ± 1mm, this purpose is to ensure that the display image does not distort, local bulge or recess will lead to the visual angle of the display appears dead.
2. Color reproduction: the color is the most can reflect the LED display is a good or bad standard, the color of the reduction of color reproduction is the display of color reproduction, both the display screen to show the color and the source The color to maintain a high degree of consistency, so as to ensure the realism of the image.
3. Brightness: indoor LED full color display brightness to 800cd / m2 above, outdoor LED full color display 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 Unclear the displayed image. Brightness of the size of the LED die is determined by the good or bad, so the quality of LED chips is very important.
4. Viewing angle: the size of the viewing angle directly determines the number of display audience, so the bigger the better. The viewing angle is mainly determined by the way the LED die is encapsulated.
5. White balance effect can determine a display of good or bad: red, green and blue primary colors ratio of 1: 4.6: 0.16 will show a pure white, a slight deviation in the emergence of a small imbalance, the late use of the effect This is an important factor.
6. Whether the mosaic, dead phenomenon: mosaic refers to the display appears on the bright or often black small box, both module necrosis, the main reason for the display used by the IC or connector quality, but off The Dead point is the display of the screen appears on the bright or often black single point, the number of dead spots mainly by the die is good and bad and the manufacturer's anti-static measures are perfect to decide.
7. There are no color blocks: color block is adjacent to the module there is a significant difference between the color, the color of the transition to the module as a unit, causing color phenomenon is mainly poor by the control system, gray level is not high, Scanning frequency is low.
8. Security: LED display is composed of a number of boxes, each box must have to do foreigner grounding protection, grounding resistance should be less than 0.1 Europe. And can withstand high pressure, 1500V1min no breakdown. The logo and slogan must be warned at the high voltage input and the power supply high voltage wiring.
9. Packaging transport: LED display is valuable goods, the weight is very large, manufacturers use packaging is very important. Generally according to a single box to the packaging, the box must have a protective effect on the surface of the box, the box in the transport of internal activities within the space is not. The outer box must be clearly marked.
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