Browse Prior Art Database

Display Character Set Increase

IP.com Disclosure Number: IPCOM000096648D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Weber, EV: AUTHOR

Abstract

This high speed visual data display device has a proportionately large character set in comparison to the memory capacity utilized. A complete set of italicized characters is made available to the display device without adding to the memory of character shapes. An italicized character is obtained by sending a fraction of the vertical deflection drive signal to the horizontal deflection circuit. This causes the displayed character to lean to the right or left. It is thus distinguishable from the normal upright characters.

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Display Character Set Increase

This high speed visual data display device has a proportionately large character set in comparison to the memory capacity utilized. A complete set of italicized characters is made available to the display device without adding to the memory of character shapes. An italicized character is obtained by sending a fraction of the vertical deflection drive signal to the horizontal deflection circuit. This causes the displayed character to lean to the right or left. It is thus distinguishable from the normal upright characters.

The cathode ray tube 1 is such that the electrostatic plates 2 scan a small area which is deflected to any position by magnetic deflection coils 3. An information signal from data source 4 actuates the appropriate location in character shape memory 5. The character shape information in memory 5 controls the generation of variable-slope voltage ramps in character generators 6 and 7. The horizontal and vertical variable-slope voltage ramps are applied to deflection plates 2. This causes the cathode ray tube beam to write the desired corresponding character on screen 8.

Character positioning on screen 8 is accomplished by horizontal and vertical ramp generators 9 and 10 through the magnetic deflection yokes 3. These move the beam about screen 8 in a raster fashion. A sawtooth voltage from sawtooth generator 11 is applied to deflection plates 2 during character writing to counteract the raster. Switch 12 is closed when...