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Cathode Ray Tube -computer graphics.


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CRT (Cathode ray tube):

CRT ( Cathode ray tube) Made By: Ameena Bano BCA 4 th semester


Definition The cathode ray tube (CRT) is a  vacuum tube  containing an  electron gun  (a source of electrons) and a  fluorescent  screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen. 




Working Heater element is energized by alternating current to obtain high emission of electron from cathode. Control grid is bised negative with respect to cathode it controls the density of electron beam to focus the electron beam on the screen focusing anode is used. the focusing anode opperate at a potential of twelve hundred (1200 V) and accelerating anode at 2000 V to accelerate the electron beam.

Major Components:

Major Components The basic CRT consists of four major components. Electron Gun Focussing & Accelerating Anodes Horizontal & Vertical Deflection Plates Evacuated Glass Envelope


Properties   They are produced by the negative electrode, or cathode, in an evacuated tube, and travel towards the anode.  They travel in straight lines and cast sharp shadows.  They have energy and can do work.  They are deflected by electric and magnetic fields and have a negative charge.  They are beams of tiny, negatively charged particles called electrons.


Application In cathode ray socilloscope As a display device in radar In televisions In computer Monitors

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