Learn about the Creation of TV Images

Female Speaker: A TV image is made of hundreds of line that are in turn made up hundreds of dots, when a color television receives video it decodes the signal into 3 separate signals, one for each of the primary colors, Red, Green, and blue. The colors you see on your television are created by adding various levels of these 3 colors. In side the tv two about 3 electron guns one for each color, that emit beams which scan the screen and a series of lines, in each line are rows of dots the dots are in groups of 3, red, green and blue which are made of color phosphor's that glow, instead of by the electron beams, as the beams scans line by line across the two, triggering the tiny dots a color image is reconstructed.

To make sure that the beams from the electrons guns hit the right color dots. A black shuttle mask with holes for each dot is placed between the dots and the guns. In American TV's the beams scan 525 lines 30 times a second. The combination of the speed of the scan and the lack affect of the glowing phosphor's creates the illusion of a continuos image on the screen.


Transcription by: Scribe4you Transcription Services