 Display Devices Display Devices  Display Hardware  Components of CRT Components of CRT  Refresh CRT Refresh CRT  Electron Gun  Focussing system.

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Presentation transcript:

 Display Devices Display Devices  Display Hardware  Components of CRT Components of CRT  Refresh CRT Refresh CRT  Electron Gun  Focussing system Focussing system  Deflection System Deflection System  Properties of CRT Properties of CRT

 The display systems are often referred to as Video Monitor or Video Display Unit (VDU).

 Video Display Devices  The primary output device in a graphics system is a monitor. BACK

Components of Cathode Ray Tube (CRT) 1.Electron Guns 2.Electron Beams 3.Focusing Coils 4.Deflection Coils 5.Anode Connection 6.Shadow Mask 7.Phosphor layer 8.Close-up of the phosphor coated inner side of the screen

BACK

L Refresh CRT: One way to keep the phosphor glowing is to redraw the picture repeatedly by quickly directing the electron beam back over the same points.

 The free electrons are then accelerated towards the phosphor coating by a high positive voltage.

 A positively charged metal coating on the inside of the CRT envelope near the phosphor screen. A positively charged metal

 An accelerating anode.

 Intensity of the electron beam is controlled by setting voltage level on the control grid. BACK

 The focusing system is needed to force the electron beam to converge into a small spot as it strikes the phosphor.  Electrostatic focusing is commonly used in computer graphics monitor.

 With electrostatic focusing, the electron beam passes through a positively charged metal cylinder that forms an electrostatic lens. BACK

 Horizontal deflection is accomplished with one pair of coils, and vertical deflection by the other pairs.  The proper deflection amounts are attained by adjusting the current through the coil. BACK

 The time taken by the emitted light from the screen to decay to one-tenth of its original intensity. Properties of CRT

 The intensity is greatest at the center of the spot, and decrease with Gaussian distribution out to the edges of the spot. Properties of CRT

 Resolution: The maximum number of points that can be displayed without overlap on a CRT. Overlap Properties of CRT

 This numbers gives the ratio of vertical points to horizontal points necessary to produce equal length lines in both directions on the screen. Properties of CRT BACK