Raster scan type CRT display system having an image rolling function
System with joystick to control velocity vector of a display cursor
Cartographic indicator system
Moving map display
Vehicle-mounted navigator Patent #: 4513377
ApplicationNo. 06/526158 filed on 08/24/1983
US Classes:345/590, Gamut clipping or adjustment340/995.17, Display change based on vehicle position340/995.18Particular data storage
ExaminersPrimary: Brigance, Gerald L.
Assistant: Brier, Jeffery
Attorney, Agent or Firm
International ClassG09G 5/34 (20060101)
Foreign Application Priority Data1982-08-30 JP
AbstractAn image display system is disclosed which includes an image filing device to pre-store data on the entire area of a large sized image; a CRT unit to partially display this large sized image on its display screen at the same scale; and an image memory to temporarily store a partial image of the large sized image, that will be displayed on this CRT as well as its surrounding image. When display area scrolling is directed by a scroll direction input device, image information which is newly required due to the given scrolling operation is read out under the control of the CPU, and the unnecessary image information is replaced or written over by the new image information, with semi-realtime, in the memory area in which the image information which became useless due to the scrolling operation had been stored in the image memory. Thus, the display image area concerning the scroll and its surrounding image area always prepared in the image memory, thereby allowing for a smooth scrolling operation.