Browse Prior Art Database

Flying Film Display

IP.com Disclosure Number: IPCOM000076674D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR [+2]

Abstract

This display concept involves a rotating film in the form of a cylinder and a strobing light source. A low-mass cylinder 5 consists of a film strip on which translucent characters appear on an opaque background. A full character set occurs in stripes or tracks positioned on 1/8'' centers along the cylinder. A set of tracks such as tracks 1, 2, 3 is provided, one track for each character position with the same character appearing simultaneously in all character positions in a row. If the cylinder is rotated at 3600 RPM, every character set in every character position will pass the viewing slit 60 times per second, but only those characters which are backlighted will be visible to the observer.

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Flying Film Display

This display concept involves a rotating film in the form of a cylinder and a strobing light source. A low-mass cylinder 5 consists of a film strip on which translucent characters appear on an opaque background. A full character set occurs in stripes or tracks positioned on 1/8'' centers along the cylinder. A set of tracks such as tracks 1, 2, 3 is provided, one track for each character position with the same character appearing simultaneously in all character positions in a row. If the cylinder is rotated at 3600 RPM, every character set in every character position will pass the viewing slit 60 times per second, but only those characters which are backlighted will be visible to the observer. Light-emitting diodes (LED's), one per character position, provide the fast-strobe light required to selectively backlight the character.

When the character "A" appears in the viewing slit, the light-emitting diodes for those positions where "A's" are to be displayed are selectively pulsed in parallel. This is accomplished as follows. A code read from the cylinder, or contained in a counter 6, is used to identify the character next to appear in the viewing slit. This code is compared with all of the character codes contained in the buffer store 7, which is addressed by a Memory Address Register 8. The compare circuit 9 comprises a plurality of logical AND circuits, one for each counter position. Wherever comparison occurs, a signal on line 10 sets all lat...