Browse Prior Art Database

Display Centering and Expansion System

IP.com Disclosure Number: IPCOM000096376D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 57K

Publishing Venue

IBM

Related People

Carlson, JW: AUTHOR

Abstract

This display system is responsive to the display screen address of a selected or key message to relocate the display of the key and adjacent messages in a positionally expanded manner. The display device of the system can be, for example, a shaped beam CRT 10. Such is adapted to display a succession of symbols or messages on its screen at various positions as determined by signals fed to the X and Y deflection yokes 12 and 14 on the tube.

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Display Centering and Expansion System

This display system is responsive to the display screen address of a selected or key message to relocate the display of the key and adjacent messages in a positionally expanded manner. The display device of the system can be, for example, a shaped beam CRT 10. Such is adapted to display a succession of symbols or messages on its screen at various positions as determined by signals fed to the X and Y deflection yokes 12 and 14 on the tube.

The key message is identified by a photosensing device 16. Device 16 is positioned manually to respond to the pulse of light of the message, thus producing a signal pulse on line 18. This signal is applied to sample gates 20 and 22 so as to store the X and Y address of the key message in registers 24 and 26. This information is fed to respective X and Y Operator Generator circuitries 28 and 30, together with identification of the level of expansion to be effected as determined by manual switch 32. In response to these inputs, generators 28 and 30 yield X and Y Operators which are stored in registers 34 and 36, respectively.

The X and Y display addresses of each successive message to be displayed are entered via cables 38 and 40 into the accumulators of respective adders 42 and 44. The other operands fed to the adders 42 and 44 are the X and Y Operators which have been complemented by operation of circuits 46 and 48. In other words, the X and Y operators are subtracted from the contents of the respective accumulators. This in effect relocates the area to be centered and expanded to the lower left-hand corner of the display screen.

Expansion of that display area to fill the screen area can then be effected by multiplication, carried out by shifting the contents of the accumulators. A shift control 50, responsive to the setting of the expansion level select switch 32, is provided for this purpose. If, after the subtraction step, the contents of one or the other of the accumulators is negative or if, upon shifting, there is an overflow at either of the accumulators, then the original display address of the message...