Difference Between CRT and LCD

CRT vs LCD Difference

Summary: Difference Between CRT and LCD is that CRT is a desktop/pc monitor that contains a cathode-ray tube. A cathode-ray tube (CRT) is a large, sealed glass tube.

While A LCD is a desktop/pc monitor that uses a liquid crystal display to produce images. These monitors produce sharp, flicker-free images.

The main component of CRT is the vacuum tube while in LCD is the main component is liquid crystal.

Comparison Chart

BASIS FOR COMPARISON CRT LCD
Stands For CRT stands for “Cathode Ray Tube“ LCD stands for “Liquid Crystal Display“.
Major components Vacuum glass tube, phosphor screen, electron gun, deflection plates. Glass plates, nematic liquid crystal, internal light source.
Size CRT is weighted, bulky, and large in size. LCD is light, compact, and thin in size.
Weight Heavier Lighter
Power Consumption It consumes High power. It consumes low power.
Power Consumption It consumes High power. It consumes low power.
Image Flickering Image Flickering is there in CRT. No Image Flickering is there on LCD.
Color CRT is like Black. LCD is like White.
Image Retention Image Retention is not there in CRT. Image Retention is there on LCD.
Cost It is less expensive. It is more expensive.
Image Forming Electron Gun is used to form images. Liquid crystals are used to form images.
Response CRT having a good response. LCD has a slow response.
Benefits Panels weigh less than plasma; use less energy; light; thinner; emits less electromagnetic radiation; no bleeding or smearing Easy to move as cannot be wall-mounted; good picture quality; cheaper; wide viewing quality; sharper image quality; multiple resolutions
Limitations Picture slightly less natural and “filmlike” than plasmas; slower refresh rate; limited viewing angle; blacks are brighter; susceptible to burn-out and image persistence; dead or stuck pixels may appear Heavier, small screens; old technology (obsolete); susceptible to burn-ins
Where Used CRT is used in Televisions and was used in old
computer monitors.		 LCD is used in flat screens.




CRT(Cathode Ray Tubes)

CRT(Cathode Ray Tubes)
CRT(Cathode Ray Tubes)
    • It is an evacuated glass
    • An electron gun at the rear of the tube produce a beam of electrons which is directed towards the screen of the tube by a high voltage typically 15000 to 20000 volts
    • The inner side screen is coated with phosphor substance which gives light when it is stroked by
    • Control grid controls the velocity of electrons before they hit the
    • The control grid voltage determines how many electrons are actually in the electron beam. The negative the control voltage is the fewer the electrons that pass through the
    • Thus control grid controls the Intensity of the spot where the beam strikes the
    • The focusing system concentrates the electron beam so it converges to a small point when hits the phosphor coating.
    • Deflection system directs beam which decides the point where the beam strikes the
    • The deflection system of the CRT consists of two pairs of parallel plates which are vertical and horizontal deflection
    • The voltage applied to vertical and horizontal deflection plates is control vertical and horizontal deflection respectively.

There are two techniques used for producing images on the CRT screen:

  1. Vector scan/Random scan
  2. Raster scan display