Brightness control circuit for LED displays

Details Brightness control circuit for LED displays Brightness control circuit for LED displays

1976-05-20

1978-05-16

Wilbur, Maynard R.

Communications: electrical

Systems

With specific power supply

340340, 340324R, 315169TV, G09B 1300, H05B 3900, H05B 4100

Patent

active

040901890

ABSTRACT:
A brightness control circuit for use with light emitting (LED) displays, or comparable electronic displays that are energized from a source of DC potential that supplies periodic pulses of constant peak current to the display elements, the display brightness being controlled as a function of the pulse duty cycle so as to achieve a uniform and continuous control of the display over a relatively wide range of brightness levels, extending particularly into the lower brightness region. Energizing current is coupled to the display by a transistor switching means actuated at a given frequency and with a duty cycle that is a function of the brightness control setting.

REFERENCES:
patent: 3493956 (1970-02-01), Andrews et al.

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