Brightness control device for light emitting display of electron

Details Brightness control device for light emitting display of electron Brightness control device for light emitting display of electron

1980-09-25

1982-11-09

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315 77, 3151691, 315178, 315210, 315295, 315307, H05B 3702

Patent

active

043587135

ABSTRACT:
A brightness control device for a light emitting display of an automotive vehicle electronic meter wherein the brightness of the light emitting display is controlled in response to the variable duty factor output pulse signal produced by an illumination controller for an illumination lamp of an ordinary meter. A circuit is provided for securing the minimum brightness of the light emitting display. The circuit is rendered operative when a lighting switch is turned off to limit the amplitude of a pulse voltage applied to one terminal of the light emitting display.

REFERENCES:
patent: 4090189 (1978-05-01), Fisler
patent: 4241294 (1980-12-01), Fisler

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