Close-up of coloured strips making up a TV image

Close-up of coloured strips making up a TV image

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Close-up of part of a television screen showing two colours; green and magenta. The red, green and blue phosphor strips which make up the image are clearly visible. The colour seen by the eye at a given spot on the screen is made up of varying proportions of red, green & blue light, the strips being close enough together to be perceived by the eye as a single colour. The three colours are controlled by three separate electron beams, which scan across the screen line by line, producing a complete picture twenty five times each second. Variations in the intensity of the scanning beams control the intensity of the three colours at different points on the screen.

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Keywords: close-up, colour, making up tv, technology, television, television screen

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