Pager with automatically illuminated display

Details Pager with automatically illuminated display Pager with automatically illuminated display

1984-09-25

1987-02-17

Brigance, Gerald L.

Communications: electrical

Continuously variable indicating

With meter reading

3403111, 340765, 116263, G09G 318

Patent

active

046443509

ABSTRACT:
A pager comprising a light sensor which is responsive to light externally illuminating the pager to generate a first signal when the sensed light is below a predetermined luminance value. The first signal is supplied to a coincidence gate which provides a coincidence output when it detects the coincidence of the first signal with a second signal that is generated when there is a message on a display. The coincidence output feeds a light source to illuminate the display to make it visible under poor lighting conditions.

REFERENCES:
patent: 3437004 (1976-02-01), Natori et al.
patent: 3849979 (1974-11-01), Tanji
patent: 4536761 (1985-08-01), Tsunoda et al.

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