Explain refresh cathode ray tube
Explain refresh cathode ray tube?
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♦ A beam of electrons, emitted by an electron gun, passes through focusing and deflection systems that direct the beam toward specified positions on the phosphor coated area.
♦ The phosphor that emits a small spot of light at each position contacted by the electron beam.
♦ One way to keep phosphor glowing is to redraw the picture repeatedly by quickly directing the electron beam back over the same points
♦ This type of display is called is called refresh CRT
♦ Primary components of electron gun
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