Display System

Digital Display System CGA ( Colour Graphic Adapter) It has 4 signals, 3 determines whether electron has assigned to those colures is turned on or off ,4 signal increase intensity of 4 signals simultaneously. RBGI is 16 EGA ( Enchanced Graphic Adapter) 6 bit code (RIGIBI) 64 colours ,signal for 3 colours ,and an intensity signal to each VGA (Video Graphics Array) Resolution 640*480,16 colours from 256K colour palette, Text resolution 720*400 pixels in either 16 colours or shared of gray ,320*200 display 256 colours from 256K palette(26*26*26),Horizontal Frequency=31.5KHZ,vertical frequency =70HZ SVGA ( Super Video Graphics Array) 15 pin D-shell, graphics resolution 640*481 pixels MDA (Monochromes Display Adapter) Use only 1 video signal, but it can have 3 states corresponding to black. moderate – intensity & high intensity images. Analogues Display System Signal are called analogue because electrical strength equates to the brightness of the electron beam inside the CRT & the image on the tube face .it mostly use for VGA & new video standards. Types of Monochrome Monitors 1. TTL Monochrome 2. Composite Monochrome 3. VGA Monochrome 4. Multi-Scanning Monochrome Types of Colour Monitors 1. Composite Colour 2. RGB(CGA) 3. Enhanced RGB (EGA) 4. VGA 5. Multi-scanning colour