1. Is it a monochrome screen, a dual-color screen or a full-color screen;
2, Is it a dot matrix screen or a patch screen or a direct insertion screen;
3, What is the pixel pitch;
4. What brand of light-emitting chip is used;
5. What brand is used to package the LED lamp beads (Mulinsen, Jingtai, Xinguangtai, National Star)