CE-201 Lect_2

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    (Display, Input & Output Devices) 

    Lecture-2

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    Cathode-ray Tube (CRT) Monitors 

    Direct-View Storage Tubes (DVST) monitors

    Flat-Panel Displays 

    !  Plasma panels 

    Thin-film electroluminescent displays 

    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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