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Raster-scan system

Raster-scan system. 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. System Memory. Video Controller. Monitor. CPU. System Bus. I/O Devices.

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Raster-scan system

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  1. Raster-scan system 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.

  2. System Memory Video Controller Monitor CPU System Bus I/O Devices Architecture of Simple Raster graphics system

  3. Frame Buffer System Memory Video Controller CPU Monitor System Bus I/O Devices Architecture of Raster system with a fixed portion of the system memory reserved for the frame buffer

  4. Raster Scan Generator X Register Y Register Pixel Register Memory Address Intensity Frame Buffer Basic Video Controller Refresh Operation To speed up pixel processing video controllers can retrieve multiple pixel values from the refresh buffer on each pass. The multiple pixel intensities are then stored in a separate register and used to control the CRT beam intensity for a group of adjacent pixels. When this group of the pixel has been processed the next block of pixel values is retrieved from the frame buffer.

  5. Display processor Memory Frame Buffer Video Controller Monitor System Memory Display Processor CPU System Bus I/O Devices Architecture of Raster graphics system with a display processor

  6. Raster Scan display processor Rectangular Grid of Pixel Positions

  7. System Memory Display Processor Monitor CPU System Bus I/O Devices Random Scan System Architecture of a Simple Random Scan System Application programs are stored in system memory. Graphics commands in the program are translated by the graphics package into a display file stored in the system memory. This display file is accessed by the display processor to refresh the screen. Display processor in a random scan system is referred to as a display processing unit or graphics controller.

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