Programmable scan control circuit for providing bar graph displa

Details Programmable scan control circuit for providing bar graph displa Programmable scan control circuit for providing bar graph displa

1981-03-17

1983-11-15

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 340754, 340791, G09G 306

Patent

active

044158912

ABSTRACT:
A programmable display device comprises a bar graph display panel having an anode, a series of spaced cathodes connected in groups representing respective phases and a reset cathode at one end of such series; and a scan control circuit for that display panel including a first programmable memory, such as, a PROM, having an output providing a clocking waveform representing a plurality of phase pulses and a reset pulse and being addressed to develop the phase pulses and reset pulse in a repeated cathode scanning cycle, a second programmable memory, desirably constituted by a plurality of PROMs and operated synchronously with the phase pulses for generating an analog ramp voltage of a slope and dynamic range determined by the second programmable memory, a comparator comparing the ramp voltage with a d.c. voltage characteristic of level of an audio or other signal to be displayed and providing a comparison output for energizing the anode in each cathode scanning cycle for an interval thereof in which such d.c. voltage exceeds the ramp voltage, and a circuit by which the phase pulses and reset pulse are applied to the series of cathodes in each cathode scanning cycle to provide a glow in the panel during energizing of the anode, with such glow occurring over a length of the panel representing the signal level to be displayed. Desirably, the first programmable memory may cause repetitive pulses in one of the phases so that an intensified segment is provided at a selected location along the glow on the display panel.

REFERENCES:
patent: Re30172 (1979-12-01), Saxon
patent: 3922666 (1975-11-01), Inami et al.
patent: 4027197 (1977-05-01), Coleman
patent: 4155084 (1979-05-01), Klees
patent: 4240073 (1980-12-01), Seats et al.
patent: 4253096 (1981-02-01), Kmetz

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