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Publication numberUS3786478 A
Publication typeGrant
Publication dateJan 15, 1974
Filing dateAug 17, 1972
Priority dateAug 17, 1972
Publication numberUS 3786478 A, US 3786478A, US-A-3786478, US3786478 A, US3786478A
InventorsKing P
Original AssigneeMassachusettes Inst Technology
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cathode ray tube presentation of characters in matrix form from stored data augmented by interpolation
US 3786478 A
Abstract
Apparatus is disclosed for displaying a selected character on the face of a cathode ray tube at a particular location from information previously stored in a memory. The cathode ray tube is swept in a raster scan with a superimposed sinusoidal deflection in the y-axis direction. The intensity modulation which produces a dot-like representation of a character occurs at a particular time during the scan depending upon the desired location of the character. The intensity modulation as a function of time is unique for each character and occurs along the sinusoidal deflection. The required storage capacity of the memory storing the character information is reduced by an interpolation technique.
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Description  (OCR text may contain errors)

United States Patent 1191 King, Jr.

[ CATIIODE RAY TUBE PRESENTATION OF CHARACTERS IN MATRIX FORM FROM STORED DATA AUGMENTED BY INTERPOLATION [75] Inventor: Paul Allen King, Jr., Cambridge,

Mass.

[73] Assignee: Massach usettes Institute of Technology, Cambridge, Mass.

221 Filed: Aug. 17, 1972 211 App]. N0.: 281,596

Related US. Application Data [63] Continuation of Ser. No. 50,641, June 29, 1970.

[52] US. Cl 340/324 AD, l78/D1G. 3 [51] Int. Cl. G06f 3/14 [58] Field of Search 340/324 AD;

[56] References Cited UNITED STATES PATENTS 3,396,377 8/1968 Strout 340/324 AD 3,422,737 1/1969 Bailey, Jr. .l 340/324 AD 1 Jan. 15, 1974 3,573,789 4/1971 Sharp et al l78/DIG. 3

Primary ExaminerThomas B. Habecker Assistant ExaminerMarshall M. Curtis Attorney-Thomas Cooch et al. and Arthur A. Smith, Jr.

[57] ABSTRACT Apparatus is disclosed for displaying a selected character on the face of a cathode ray tube at a particular location from information previously stored in a memory. The cathode ray tube is swept in a raster scan with a superimposed sinusoidal deflection in the y-axis direction. The intensity modulation which produces a dot-like representation of a character occurs at a particular time during the scan depending upon the desired location of the character. The intensity modulation as a function of time is unique for each character and occurs along the sinusoidal deflection. The required storage capacity of the memory storing the character information is reduced by an interpolation technique.

7 Claims, 34 Drawing Figures l sz PATENTEU 3,786,478

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Contents Contents Window Output Output Rule of SR1 of SR2 matrix time value used ABCDE FGHIJ E load word 01110 1 .0 0 1. 5 0 00111 0 E] 2 0 1 #1 2 5 1 011 105219595 3 0 1 #1 3 5 l 01 110 [g] u. 0 1 #1 load new word 7-5 0 095100 10011 [10 i 8. o 0 8. 5 0 05259510 01001 E! 9. 0 0

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INVENTOR PAUL ALLEN KING, JR.

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PAUL ALLEN KING, JR BY ATTORNEY PAIENIEB 51W 3. 786.478

sum 18 0F 26 AT YNRNEY

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3396377 *Jun 29, 1964Aug 6, 1968Gen ElectricDisplay data processor
US3422737 *Dec 27, 1965Jan 21, 1969Xerox CorpVariable font character generator
US3573789 *Dec 13, 1968Apr 6, 1971IbmMethod and apparatus for increasing image resolution
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3893100 *Dec 20, 1973Jul 1, 1975Data Royal IncVariable size character generator with constant display density method
US3918039 *Nov 7, 1974Nov 4, 1975Rca CorpHigh-resolution digital generator of graphic symbols with edging
US3999167 *Nov 1, 1974Dec 21, 1976Fuji Xerox Co., Ltd.Method and apparatus for generating character patterns
US4081799 *Mar 3, 1976Mar 28, 1978Sperry Rand CorporationCharacter generation system for a visual display terminal
US4107662 *Feb 17, 1976Aug 15, 1978Hitachi, Ltd.Character generator for visual display devices
US4158838 *Jan 16, 1978Jun 19, 1979Hughes Aircraft CompanyIn-raster symbol smoothing system
US4193122 *Nov 28, 1977Mar 11, 1980Gould Inc.Connecting line generator
US4203102 *Nov 2, 1978May 13, 1980International Business Machines CorporationCharacter display system
US4297694 *May 16, 1979Oct 27, 1981Thomson-CsfSymbol generator for a graphic console
US4408199 *Sep 12, 1980Oct 4, 1983Global Integration Technologies, Inc.Ideogram generator
US4445185 *Mar 22, 1982Apr 24, 1984Chesebrough-Pond's Inc.Video inspection system
US4476462 *Nov 16, 1981Oct 9, 1984The United States Of America As Represented By The Department Of Health And Human ServicesUse of context to simplify two-dimensional computer input
US4697177 *Dec 26, 1984Sep 29, 1987High Resolution Television, Inc.High resolution dot-matrix character display
US4794387 *Jan 3, 1986Dec 27, 1988Sanders Royden C JunEnhanced raster image producing system
US4796016 *May 5, 1986Jan 3, 1989U.S. Philips CorporationPixel rounding method and circuit for use in a raster scan display device and a raster scan display device comprising such circuit
US4856920 *Apr 22, 1987Aug 15, 1989Sanders Royden C JunDot matrix printing and scanning
US4967372 *May 16, 1986Oct 30, 1990The United States Of America As Represented By The Department Of Health And Human ServicesAutomatic orientation and interactive addressing of display
US6529637Mar 3, 1995Mar 4, 2003Pixel Instruments CorporationSpatial scan replication circuit
US6545686Feb 2, 1999Apr 8, 2003Oak Technology, Inc.Cache memory and method for use in generating computer graphics texture
US7382929Oct 1, 2001Jun 3, 2008Pixel Instruments CorporationSpatial scan replication circuit
US7822284Jun 10, 2004Oct 26, 2010Carl CooperSpatial scan replication circuit
US7986851Feb 9, 2009Jul 26, 2011Cooper J CarlSpatial scan replication circuit
EP0020927A1 *Apr 25, 1980Jan 7, 1981International Business Machines CorporationDisplay system with major and minor raster scans
WO1987003124A1 *Nov 18, 1986May 21, 1987Sanders Royden C JunRaster scanning system for enhanced resolution
Classifications
U.S. Classification345/12, 345/601, 345/25, 345/27
International ClassificationG09G1/18, G09G1/14
Cooperative ClassificationG09G1/18
European ClassificationG09G1/18