Modulator circuit for a matrix display device

Details Modulator circuit for a matrix display device Modulator circuit for a matrix display device

1980-04-14

1982-10-05

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340792, 358241, G09G 322

Patent

active

043530621

ABSTRACT:
A modulator circuit for a matrix display device, the modulator circuit having pulse width and pulse amplitude control. The current amplitude for a selected picture element (row address-column address) varies during the pulse width of an excitation pulse in correspondence with the number of counting positions of a counting circuit used for determining the pulse width.
A column conductor has an associated column excitation circuit in which a counting circuit for determining the excitation pulse width controls excitation switches which pass selectively currents from current source I.sub.A . . . 64I.sub.A of a current source circuit to the column conductor. The initial setting of the counting circuit determines the excitation pulse width, and the count positions of the counting circuit select the currents to be passed to the column conductor as the counting circuit is stepped by clock pulses to measure the duration of the excitation pulse.

REFERENCES:
patent: 4021607 (1977-05-01), Amano
patent: 4193095 (1980-03-01), Mizushima
patent: 4210934 (1980-07-01), Kutaragi

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