Electronic visual display unit for alphanumeric characters

Details Electronic visual display unit for alphanumeric characters Electronic visual display unit for alphanumeric characters

1976-07-06

1978-07-04

Trafton, David L.

Communications: electrical

Systems

With specific power supply

340324R, 340378R, 350 64, H05B 3300, G09F 932

Patent

active

040991725

ABSTRACT:
A display using at least one LED to create at least one entire dot matrix for alphanumeric characters. This is obtained by interposing between the LED and the observer a special rotating prism of transparent material. Two of the opposite faces of the prism are parallel to the axis of rotation, two other faces are inclined with respect to said axis of an angle .alpha., while the remaining two faces are inclined with respect to the same axis of an angle 2 .alpha.. In consequence of the rotation of the prism and of the different inclination of its faces, the virtual image of the LED is successively positioned at all of the points of a matrix of 5 columns. The turning on of the LEDs of the display is synchronized with the rotation of the prism by means of a sensing device cooperating with a strobe wheel and the emitted light is modulated according to the desired character, so that for each LED a full alphanumeric character is displayed according to a dot matrix.

REFERENCES:
patent: 1747433 (1930-02-01), Genest
patent: 2070460 (1937-02-01), Traub
patent: 2644031 (1953-06-01), Klyce
patent: 2976361 (1961-03-01), Stamps
patent: 2976362 (1961-03-01), Stamps
patent: 3651258 (1972-03-01), Ammann
patent: 3744048 (1973-07-01), Treichel
patent: 3820123 (1974-06-01), Ammann

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