Communications: electrical – Systems – With specific power supply
Patent
1977-01-28
1978-07-04
Trafton, David L.
Communications: electrical
Systems
With specific power supply
315297, 340336, G09F 932
Patent
active
040991717
ABSTRACT:
The brightness of given LED segments of each digit section of an LED display device for providing illuminated displays of selected alphanumeric characters is controlled by controlling the amount of energy provided to each given digit section for illumination of the given LED segments in accordance with the selection of the character to be displayed by the given digit section. For example, when a character having only three illuminated segments, such as a "7" is displayed, less current is provided to the digit section than when a character having six illuminated segments, such as a "0" is displayed, thereby providing an apparent uniform brightness as to both characters.
REFERENCES:
patent: 3412315 (1968-11-01), Hehenkamp
patent: 3925690 (1975-12-01), Spence
patent: 3986186 (1976-10-01), Cochran
patent: 4029991 (1977-06-01), Schultz
R. T. Gill, "Multiplexing and Individual Addressing the Man I Seven-Segment Display," Electronic Special Products, Nov. 1969.
Howard Borden and Richard Kniss, "Strobing Makes Longer LED Alphanumeric Displays Practical," Electronics, Mar. 2, 1970, pp. 126-130.
R. T. Gill, "Segmented Array Simplifies External Address Circuitry Required for Numeric Display, Strobing Permits Time-Sharing of Logic and Drive," Electronics, Mar. 2, 1970, pp. 132-135.
Hewlett Packard, "Monolithic Solid State Seven Segment Displays," Application Note 933, Nov. 1970.
"Solid State Module Makes for Light Reading," By members of the Technical Staff, Solid State Laboratory, Electronics, Sept. 2, 1968, pp. 74-81.
National Semiconductor Corporation
Trafton David L.
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