Communications: electrical – Visual indication – Using light emitting diodes
Reexamination Certificate
1999-10-28
2001-06-05
Goins, Davetta W. (Department: 2736)
Communications: electrical
Visual indication
Using light emitting diodes
C340S815530, C340S815560, C340S815650, C345S111000
Reexamination Certificate
active
06243021
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the field of electronic instruments for indicating and measuring variable parameters such as temperature, viscosity, and density, and for indicating states such as achievement of or regression from a limit of a variable parameter.
OBJECTS OF THE INVENTION
A first object of the invention is to provide an improved electronic instrument having pairs of light emitting diode elements which, when energised, are of two respective colours and which are so arranged relative to each other that when energised simultaneously they display a third colour which is a derivative of their respective colours.
A second object of the invention is to provide an arrangement, of pairs of light emitting diode elements, which permits display, when the elements are energised, of almost all of the letters of the alphabet and also the numerals from “0” to “9” with a clarity hitherto obtainable only with a greater number of diode elements.
SUMMARY OF THE INVENTION
According to the invention there is provided an electronic instrument having a display comprising a group of light emitting diode elements, the diode elements of a first portion of the group being of a first colour when energised, the diode elements of a second portion of the group being of a second colour when energised, the respective individual diode elements of the first portion of the group being each juxtaposed to a respective individual diode element of the second portion of the group such that when both of the juxtaposed diode elements are energised at the same time they collectively display a third colour which is a derivative of their respective colours.
REFERENCES:
patent: 4705406 (1987-11-01), Havel
patent: 4707171 (1987-11-01), Havel
patent: 4845745 (1989-07-01), Havel
patent: 4929936 (1990-05-01), Friedman et al.
Hollander J. Steven
Leontiev Daniel
Nastase Stefan Serban
Drucker William A.
Goins Davetta W.
Newport Electronics, Inc.
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