Low power uniform high luminous intensity digital display

Details Low power uniform high luminous intensity digital display Low power uniform high luminous intensity digital display

1975-05-19

1976-11-23

Jackmon, E. S.

Communications: electrical

Land vehicle alarms or indicators

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

340334, G04B 1930, G09B 1300

Patent

active

039928730

ABSTRACT:
A light emitting digital display for use in subminiature assemblies such as miniaturized wrist watches. A crystal controlled frequency reference operates in conjunction with integrated circuitry for providing scanning of a number of display digits and for scanning of individual segments in each digit. The digit scan frequency is above the frequency resolution capability of an observers eye and the segment scan feature allows only one segment in the entire display to be energized at any instant. The segment duty cycle is therefore on the order of the ratio of one to the total number of segments in the display, which allows high peak current to be passed through each segment while maintaining a low average current. The high peak current provides for a high luminous intensity display. A finger switch having two exposed electrodes is actuated by placing a biological segment across the electrodes thereby causing the display to appear. An associated photosensitive device provides a signal indicative of ambient light level for continuously varying the brightness of the display to afford a desired contrast to the eye of an observer. The photosensitive device is also sensitive to the brightness level of individual segments and provides a signal for instantaneous adjustment of current through each segment to provide for uniform brightness therebetween. A set switch is provided including a Hall effect device for sequencing the display to a predetermined point by placing a magnetic field proximate to the assembly while actuating the finger switch.

REFERENCES:
patent: 3781852 (1973-12-01), White et al.
patent: 3787752 (1974-01-01), Delay

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