Display device and display unit for use therein

Details Display device and display unit for use therein Display device and display unit for use therein

1974-11-26

1977-01-18

Pitrelli, John F.

Card, picture, or sign exhibiting

Check, label, or tag

Reinforced

40 37, G09F 930, G09F 1334

Patent

active

040031497

ABSTRACT:
A display device consists of rows and columns of display units each capable of either an illuminated or a dark condition whereby selection of suitable units for illumination can form a display character. The character can be caused to progress along the device by connecting the units in two groups of alternate units and by energizing these groups alternately to cause each unit momentarily to assume a master relationship towards the next downstream unit and hence transfers its state of illumination to such downstream unit. Energization is pneumatic, each unit containing a shutter that acts, when moved between two positions, both to change the state of such unit and as a valve controlling air flow to the next downstream unit.

REFERENCES:
patent: 3530606 (1970-09-01), O'Keefe
patent: 3748764 (1973-07-01), Schilter

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