The mobile phone is installed with 9 1kds. Select Education in the upper left corner of the software. When the broadcast channel passes the advertising spot, TV will appear in the upper right corner. This is a screen projection option. You can play it by selecting the TV you want to project.

The sequential sampling, transmission and reproduction of TV signals from point to surface are completed by scanning. Television scanning systems vary from country to country. In China, there are 25 frames per second with 625 lines per frame. Each line is scanned from left to right, and each frame is divided into odd lines and even lines from top to bottom according to interlacing, so as to reduce flicker.

Image information is transmitted during scanning. When the scanning electron beam returns to the line retrace line before the start of the next line from the end of the previous line, and the field retrace line after each field is scanned from top to bottom, it should be blanked. During the blanking period of the line field, the line field synchronization signal is transmitted to synchronize the received and transmitted scanning, thus accurately reproducing the original image.