#Cathode ray tube television free#

Depending on which electron beam is firing and which color phosphor dots are being hit, a spectrum of colors is produced. Rather, the screen is coated with red, green, and blue phosphors that are arranged in stripes. It is mainly used for entertainment, information and education. Additionally, the phosphor coating is not just white. The moving images that it receives from a nearby broadcasting station is projected in three dimensions by the cathode ray tube or CRT and it also has an audio decoder to reproduce the sounds from the transmitted radio signals through the audio speakers. They are called the red, green, and blue beams. In a color television, three electron beams are present. Color television followed, as the medium became more popular, and demands for a more realistic image increased.

In this technology, the phosphor is white. The resulting pattern of glowing and dark phosphors is what is interpreted by the brain as a moving image.īlack and white television was the first to be developed, as it utilized the simplest technology. This process occurs very quickly-about 30 times each second-producing multiple images each second. The electron beam can be focused in a coordinated way on different part of the phosphor screen, effectively painting the screen (a raster pattern). When an electron hits a phosphor, the phosphor glows. The screen is coated with a molecule called phosphor. The electrons travel to the far end of the tube where they encounter a flat screen.

#Cathode ray tube television free#

The central region is almost free of air, so that there are few air molecules to deflect the electrons from their path. The electrons are also focused electronically into a tight beam, which passes into the central area of the television screen. As electrons exit the cathode, they are attracted to the anode. The cathode is located at the back of the tube. A cathode ray tube contains a positively charged region (the anode) and a negatively charged region (the cathode).