Analog graphic display method and apparatus

Patent · Tue Aug 13 04:00:00 EDT 1991

OSTI ID:7083839

Kronberg, J W

Disclosed are an apparatus and method for using an output device such as an LED to show the approximate analog level of a variable electrical signal wherein a modulating AC waveform is superimposed either on the signal or a reference voltage, both of which are then fed to a comparator which drives the output device. Said device flashes at a constant perceptible rate with a duty cycle which varies in response to variations in the level of the input signal. The human eye perceives these variations in duty cycle as analogous to variations in the level of the input signal. 21 figures.

• DOE Contract Number: AC09-76SR00001
• Assignee: PTO; EDB-94-111368
• Patent Number(s): A; US 5039978
• Application Number: PPN: US 7-461964
• OSTI ID: 7083839
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
ANALOG SYSTEMS
COMPARATOR CIRCUITS
COMPUTER OUTPUT DEVICES
COMPUTER-GRAPHICS DEVICES
DESIGN
DISPLAY DEVICES
ELECTRONIC CIRCUITS
LIGHT EMITTING DIODES
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SIGNALS