Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1991-02-05
1993-10-19
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345134, G09G 300
Patent
active
052549836
ABSTRACT:
A gray scale binary field corresponding to each of the pixels on a raster scan oscilloscope display. Each gray scale binary field has a portion of its bits assigned to correspond to the graphical information and a portion of its bits assigned to correspond to the sampled current and prior waveforms. A decrementing state machine, in a predetermined cycle of operation, periodically reads all of the gray scale binary fields in the display memory of the oscilloscope, decrements each value by a predetermined amount such as the binary value of one, and re-writes the decremented binary values back into the display memory. As these decremented gray scale binary fields are displayed, the older waveforms become uniformly more faded with the oldest waveform having the dimmest illumination. In a typical mode of operation, the predetermined cycle of operation corresponds to the sampling of each new waveform from the system under test so that each subsequent prior waveform is decremented by the predetermined amount. In order to minimize flicker, the first prior waveform is still illuminated at full brightness, along with the current waveform. However, the second prior waveform and all older prior waveforms linearly fade in illumination.
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Yokogawa Electric Corporation Instruction Manual, DL 1200A Im 7006-01U, 4th Edition, Feb. 1991.
Long David W.
Weller Dennis J.
Hewlett--Packard Company
Weldon Ulysses
Wu Xiao M.
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