Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1997-05-28
1999-08-03
Powell, Mark R.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
348184, G09G 536
Patent
active
059331291
ABSTRACT:
A signal waveform display system for displaying waveforms of one or two input signals on a display screen is provided which comprises first-third input switching circuits, first and second trigger generators, first and second horizontal sweep generators, and a composite horizontal sweet generator. The trigger generators respectively generates first and second trigger pulses synchronously with the input signals provided thereto through the first and second input switching circuits. The sweep generators are triggered by the trigger pulses and generate first and second sweep signals having variable time periods, respectively. The composite sweep generator generates a composite sweep signal including lower portions of the first sweep signal which are smaller than a reference voltage, and upper portions of the second sweep signal which are higher than the reference voltage. The input signals are selectively provided to a vertical axis driving circuit, and the composite sweep signal is provided to a horizontal axis driving circuit, thereby the waveforms on different time scales can be laterally displayed on the screen.
REFERENCES:
patent: 3857059 (1974-12-01), Larson
patent: 4677481 (1987-06-01), Nicholas
patent: 4731586 (1988-03-01), Perkins
patent: 5526042 (1996-06-01), Ozawa et al.
Egami Haruhisa
Furuse Tohru
Leader Electronics Corp.
Nguyen Thu
Powell Mark R.
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