Radar CRT Display

Cathode Ray Tube Cut-away

CRT: Cathode-ray Tube. An electron tube that has an electron gun, a deflection system, and a screen. This tube is used to display visual electronic signals. An electron beam is focused on a luminescent screen than varied in position and intensity to produce a visible pattern. CRT displays are in decline, and are being replaced by Flat screen LCD displays that reduce weight, take up less space, and consume less power. Flat screens handle shock better than CRTs.

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CRT Defnitions
ANODE. A positive electrode of an electrochemical device (such as a primary or secondary electric cell) toward which the negative ions are drawn..

CATHODE. In an electron tube the electrode that is the source of current flow.

CRT. Acronym for Cathode-Ray Tube.

CONTROL GRID. The Control Grid of a CRT is used to control the brightness of the screen, as the Control Grid limits or controls the amount of electronics passing through it hitting the screen. The more electrons allowed to hit the screen, the brighter the output of the CRT.

DISPLAY. The face of the CRT that is used to display information. See Screen.

DEFLECTION COILS. In a cathode-ray tube [CRT], coils used to bend an electron beam a desired amount.

ELECTRON GUN. An electrode of a CRT that is equivalent to the cathode and control grid of conventional tubes. The electron gun produces a highly concentrated stream of electrons.

ELECTROSTATIC DEFLECTION. The method of deflecting an electron beam by passing it between parallel charged plates mounted inside a cathode-ray tube. CRT, Internal View.

FILAMENT. The cathode of a thermionic tube, usually a wire or ribbon, which is heated by current passing through it.

FOCUSING ANODE. An electrode of a CRT that is used to focus the electrons into a tight beam.

GRAPHIC COATING. TBD, Text in review.

HEATER. See Filament.

HORIZONTAL-DEFLECTION PLATES. A pair of parallel electrodes that moves the electron beam from side to side in a CRT.

NECK. The long narrow portion of the glass tube.

PERSISTANCE. The length of time a phosphor dot glows on a CRT before disappearing.

PHOSPHOR. A layer of luminescent material that is applied to the internal portion of the screen, the inner face of the CRT.

PINS. Leads on the tube neck for connection and interfacing.

SCREEN. The surface of a cathode-ray tube that produces a visible image or pattern.

VACUUM TUBE. An electron tube evacuated such that its electrical characteristics are essentially unaffected by the presence of residual gas. Vacuum Tube graphic.

VERTICAL DEFLECTION PLATES. A pair of parallel electrodes in a CRT that moves the electron beam up and down.

YOKE. A set of coils placed around the end of the neck of a CRT to magnetically deflect the electron beam before it hits the back of the CRT screen.

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