Browse Prior Art Database

Single Tube Line Spot Display

IP.com Disclosure Number: IPCOM000093505D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Karlsbakk, O: AUTHOR

Abstract

A single flying-spot display is adapted to present information. Apparatus 20 delays the information obtained while display tube 22 is in a read cycle. Apparatus 20 then permits the delayed information to be displayed in tube 22 during a write cycle. The read and write cycles alternate for each bit of information.

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Single Tube Line Spot Display

A single flying-spot display is adapted to present information. Apparatus 20 delays the information obtained while display tube 22 is in a read cycle. Apparatus 20 then permits the delayed information to be displayed in tube 22 during a write cycle. The read and write cycles alternate for each bit of information.

The conventional flying-spot display employs two cathode ray tubes, one for pickup and one for display. These two tubes can be combined into one by dividing their timing cycle into two parts, a read time and a write time. During read time, the beam in the display tube is at the pickup part of the tube and during the write time, the beam is in the display part of the tube.

During read time, the beam is pointed at a certain spot on tube
22. The photodevice picks up the signal and puts it into a conventional one bit delay line, not shown, included in apparatus 20. During write time, which immediately follows, the beam is pulled into the display position and the delay bit sensed by the photodevice is provided to the intensity grid of tube 22. The beam is then pulled back into the read position and a new bit is sensed for display immediately afterwards.

By cutting a mask with digits and letters and placing it in front of the pickup portion of tube 22, any one of these characters can be scanned and by logic decoding placed into desired positions on the tube 22 display sections. The digits consist of a matrix of dots where each dot...