TV uses three colors red, blue and green (RBG) the colors are passed inline starting at the top working down at 2.8 millions lines per second when the beam runs across the screen it is done with the color combination coded to project a set color at a set point and it starts again over and over at 2.8 million lines per second
A television uses three primary colors for images. The images are formed by these colors in varying degree of brightness. A TV can reconstruct an image from a series of brightness measurements. It uses these measurements and controls the electron beam with them as they sweep across the screen of the picture tube. The picture is painted one dot at a time.