Title: Display device and display unit for use therein

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.

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Inventors: de Vries, Peter

Application Number: 527270
Filing Date: 1974-11-26
Publication_date: 1977-01-18
Assignee:
Primary Class(es): 40/452 40/447, 40/477
Other Classes:
US Patent Ref:

3530606	Sep, 1970	O'Keefe	40/28.
3748764	Jul, 1973	Schilter	40/37.

Other Refs:
Primary Examiner: Pitrelli, John F.
Assistant Examiner:
Attorney: