Video controller in raster scan system. Monitor. Interactive raster graphics systems typically employ several processing units. The video controller accesses a frame buffer in system memory to refresh the screen. In addition to the central processing unit a special purpose processor called the video controller or display controller is used to control the operation of the display device. In addition to the CPU, a special-purpose processor, called the video controller is used to control the operation of the display device. • It’s a rectangular array of points or dot. Deflection Voltage : In the output circuitry, it is video controller who generates horizontal and vertical deflection voltage with the help of which monitor can sweep its beam across screen during raster scan. Jul 15, 2025 ยท Functions of Video Controller in Raster Scan System are explained following below. Interactive raster-graphics systems typically employ several processing units. System Bus. tl411 l5oi5n 31wp8 ogn dfsi bvv5g mhaf9g nnh ynt hzfg9o