Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1996-07-17
2000-05-23
Nguyen, Chanh
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345125, G09G 534
Patent
active
060670681
ABSTRACT:
A system to scroll a first image inside a window of a second image displayed on a display screen. The system includes storage of the second image in a VRAM, designation of display addresses in the VRAM corresponding to a location of the window on the display screen, storage of the first image in a memory different from the VRAM, definition of a pointer indicating a first portion of the image to be displayed in the window, and copying of the first portion of the first image from the memory to the VRAM at the display addresses based on the pointer. The system further includes display of the first portion of the first image in the window of the second image, acceptance of user interface commands to scroll the first image and changing the value of a pointer in response thereto, the changed value indicative of a second portion of the first image to be displayed in the window, and repetition of the copying step and the displaying step with respect to the second portion.
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Canon Business Machines, Inc.
Nguyen Chanh
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