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Browse Prior Art Database

Display System

IP.com Disclosure Number: IPCOM000091536D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Criscimagna, TN: AUTHOR

Abstract

A CRT graphic display system is associated with a digital computer processing unit CPU for generating a display in response to digital signals provided by the CPU. Where the display is required to either generate or manipulate complex functions or both, the amount of time required of the CPU for generating the required functions can become excessive. This is because of the great number of digital operations which can be required.

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Display System

A CRT graphic display system is associated with a digital computer processing unit CPU for generating a display in response to digital signals provided by the CPU. Where the display is required to either generate or manipulate complex functions or both, the amount of time required of the CPU for generating the required functions can become excessive. This is because of the great number of digital operations which can be required.

In this system, the CPU is freed of having to generate the required display functions by providing for generation in the display using analog techniques. The digital data provided by CPU 10 corresponding to each point of the display is successively set up in respective display digital storage registers 12. The outputs of the latter are applied to digital-to-analog function generators 14 for analog generation of X and Y deflection yoke signals for X and Y deflection yokes 18 of cathode ray tube 20. Since many digital operations can be required for complex function generation or manipulation or both, the use of digital-to- analog conversion permits analog function generation. Such provides the advantage of considerable simplification and potentially higher generation speeds as well as greatly reducing the time required of CPU 10. The latter is then free for other work once it sets up registers 12. The resolution of the system can be varied by varying the size of the point-to-point steps provided by CPU 10.

The drawing shows a system f...