GB1358071A - Display control apparatus - Google Patents

Display control apparatus

Info

Publication number
GB1358071A
GB1358071A GB1515371*[A GB1515371A GB1358071A GB 1358071 A GB1358071 A GB 1358071A GB 1515371 A GB1515371 A GB 1515371A GB 1358071 A GB1358071 A GB 1358071A
Authority
GB
United Kingdom
Prior art keywords
incremental
deflection
maximum
values
arc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1515371*[A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Services Ltd
Original Assignee
Fujitsu Services Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Services Ltd filed Critical Fujitsu Services Ltd
Priority to GB1515371*[A priority Critical patent/GB1358071A/en
Priority to AU42094/72A priority patent/AU464271B2/en
Priority to US00252297A priority patent/US3778667A/en
Priority to DE2223256A priority patent/DE2223256C3/en
Priority to FR7217299A priority patent/FR2139541A5/fr
Publication of GB1358071A publication Critical patent/GB1358071A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/08—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system
    • G09G1/10—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system the deflection signals being produced by essentially digital means, e.g. incrementally

Abstract

1358071 Cathode-ray tube displays INTERNATIONAL COMPUTERS Ltd 12 May 1972 [15 May 1971] 15153/71 Heading H4T The Specification is concerned with drawing arcuate lines on the screen of a cathode-ray display tube (by appropriate X and Y deflection of the beam) with an accuracy such that the maximum difference in position of the chord actually traced and the true arcuate path is less than the spot resolution of the tube beam for each incremental deflection of the beam such incremental deflections specifying the radius of the arc in binary code form so that the maximum radial value for an arc is 2<SP>n</SP>-1 where n is the maximum capacity of a binary register. This is, notionally, taken as 2<SP>n</SP> and it is shown that for the maximum, expressible, radius the maximum incremental angle of beam deflection # (see Fig. 1) may be assumed to be 2(2)¢/2n/2. From this incremental deflections are derived (in terms of the values in the registers) and assuming the arc is to be drawn relative to an initial angle #, the start co-ordinates X = R cos # and Y = R sin # are calculated and held in respective binary position registers and by "right-shifting" the values in the appropriate registers by half its capacity n( = 2n/2) and by n + 1 places ( = 2<SP>n+1</SP>) the actual incremental values #X and #Y may be obtained. These are then employed for beam deflection and additionally are added to the values standing in the register to provide the "start position" for the next incremental deflection. Two schematic arrangements for carrying out the arrangement are described with reference to Figs. 2 and 3 (neither shown) one of which includes means responsive to the end of a quadrant for changing the incrementing or decrementing of the beam position register.
GB1515371*[A 1971-05-15 1971-05-15 Display control apparatus Expired GB1358071A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB1515371*[A GB1358071A (en) 1971-05-15 1971-05-15 Display control apparatus
AU42094/72A AU464271B2 (en) 1971-05-15 1972-05-10 Improvements in or relating to display control apparatus
US00252297A US3778667A (en) 1971-05-15 1972-05-11 Display control apparatus for drawing accurate lines
DE2223256A DE2223256C3 (en) 1971-05-15 1972-05-12 Device for controlling the drawing of circularly curved lines on a display surface
FR7217299A FR2139541A5 (en) 1971-05-15 1972-05-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1515371*[A GB1358071A (en) 1971-05-15 1971-05-15 Display control apparatus

Publications (1)

Publication Number Publication Date
GB1358071A true GB1358071A (en) 1974-06-26

Family

ID=10053979

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1515371*[A Expired GB1358071A (en) 1971-05-15 1971-05-15 Display control apparatus

Country Status (5)

Country Link
US (1) US3778667A (en)
AU (1) AU464271B2 (en)
DE (1) DE2223256C3 (en)
FR (1) FR2139541A5 (en)
GB (1) GB1358071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257355A (en) * 1986-10-01 1993-10-26 Just Systems Corporation Method and apparatus for generating non-linearly interpolated data in a data stream

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1145275A (en) * 1965-07-22 1969-03-12 Int Computers Ltd Improvements in or relating to graphic display systems
US3555538A (en) * 1967-02-15 1971-01-12 Bunker Ramo Display apparatus
US3540032A (en) * 1968-01-12 1970-11-10 Ibm Display system using cathode ray tube deflection yoke non-linearity to obtain curved strokes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257355A (en) * 1986-10-01 1993-10-26 Just Systems Corporation Method and apparatus for generating non-linearly interpolated data in a data stream

Also Published As

Publication number Publication date
FR2139541A5 (en) 1973-01-05
AU4209472A (en) 1973-11-15
DE2223256C3 (en) 1979-09-06
DE2223256B2 (en) 1979-01-04
US3778667A (en) 1973-12-11
DE2223256A1 (en) 1972-11-23
AU464271B2 (en) 1975-08-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee