How does television produce image? cathode ray tube

Описание: A standard TV set turns the video signal into beams of tiny particles called electrons. It shoots these beams at the back of the screen through a picture tube. The beams “paint” the pixels on the screen in a series of rows to form the picture. The TV set sends the audio signal to loudspeakers, which reproduce the sound.

LCD and plasma TVs form the picture differently. They do not use a picture tube and electron beams. Because they do not hold a picture tube, LCD and plasma TVs are much thinner and lighter than standard TVs. They can even hang on a wall.

LCD stands for liquid crystal display. Liquid crystal is a substance that flows like a liquid but has some tiny solid parts, too. The display sends light and electric current through the liquid crystal. The electric current causes the solid parts to move around. They block or let light through in a certain way to make the picture on the screen.

A plasma display has tiny colored lights containing a gas called plasma. Electric current sent through the plasma causes it to give off light, which makes the picture.
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