Method for dynamically viewing image elements stored in a random access memory array
Display terminal with modularly attachable features
Apparatus and method for scrolling text and graphic data in selected portions of a graphic display
Real time toroidal pan
Display controlling apparatus
Video processing architecture Patent #: 4517654
ApplicationNo. 06/582202 filed on 02/21/1984
US Classes:715/806, Window memory structure345/534, Memory access timing signals345/684, Scrolling345/686Memory addressing
ExaminersPrimary: Brigance, Gerald L.
Attorney, Agent or Firm
International ClassesG09G 5/40 (20060101)
G09G 5/14 (20060101)
AbstractBy selecting the starting time of the display readout of a pel buffer raster generation, the pel data is mapped to a display screen with an arbitrary displacement with respect to the screen for relocation or scrolling of the pel image on the screen. To compensate for non-congruency between the pel data window and screen viewport definitions and to provide scrolling on a pel basis, the positioning of the window on the screen includes fine adjustment achieved by a determinable delay between the scanning of the buffer and the generation of the screen raster. The display circuits include means to extend the window background to fill in gaps between the edges of a window of pel data chosen to be displayed and a larger screen viewport in which it is to be displayed. System read/write access times to the buffer are interleaved with and synchronized to the data fetch times of the display.