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Where does the TV menu appear?
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Television (TV/Video): Short for color TV set, which uses electricity to instantly transmit moving visual images. Similar to movies, TV uses the visual residual effect of human eyes to gradually change the still image frame by frame to form a visually moving image.

The transmitter of the TV system converts every tiny part of the scene into electrical signals according to the brightness and chromaticity, and then transmits them in turn. At the receiving end, the brightness and chromaticity of each tiny part are displayed according to the corresponding geometric position to reproduce the whole original image.

Television principle:

The sequential sampling, transmission and reproduction of TV signals from the TV set to the ground 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.