CE-201 Lect_2
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Transcript of CE-201 Lect_2
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(Display, Input & Output Devices)
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Lecture-2
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Cathode-ray Tube (CRT) Monitors
Direct-View Storage Tubes (DVST) monitors
Flat-Panel Displays
! Plasma panels
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Thin-film electroluminescent displays
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Light-emitting Diode (LED)
! Liquid-crystal displays (LCD)
3D Viewing Devices
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which contains a series of holes aligned with the phosphor-dot patterns.
Color CRT
A CRT monitor displays color pictures by using a combination of phosphors
that emit different color light. A range of color is generated by combiningemitted light from different phosphors.
Beam penetrating methods – for random scan monitors
! Two layers of phosphor (Red-outer & Green-inner) are coated inside the
CRT screen.
!
Display color depend on depth of penetration of electron beam
!
Picture quality not good.
Shadow-mask methods - for raster scan monitors
! produce much wider range of colors.
! Shadow mask CRT has three phosphor color dots (RGB) at each pixel
positions and also three guns.
!
Three guns are deflected and focused as a group onto the shadow mask,
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LCD ...l
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Stereoscopic projection (3D movie & image)- two views of a objec2t1
Three-Dimensional Viewing Devices
3D-images are devised using a technique that reflects a CRT image from a
vibrating flexible mirror, which changes the focal length due to vibration.
The vibration is synchronized with the display of an object on a CRT.
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