IE38117B1 - Display device with means for drawing vectors - Google Patents

Display device with means for drawing vectors

Info

Publication number
IE38117B1
IE38117B1 IE927/73A IE92773A IE38117B1 IE 38117 B1 IE38117 B1 IE 38117B1 IE 927/73 A IE927/73 A IE 927/73A IE 92773 A IE92773 A IE 92773A IE 38117 B1 IE38117 B1 IE 38117B1
Authority
IE
Ireland
Prior art keywords
delta
deflection
numbers
shifted
axis
Prior art date
Application number
IE927/73A
Other versions
IE38117L (en
Original Assignee
Digital Equipment Corp
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 Digital Equipment Corp filed Critical Digital Equipment Corp
Publication of IE38117L publication Critical patent/IE38117L/en
Publication of IE38117B1 publication Critical patent/IE38117B1/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Television Scanning (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

A system for displaying (straight lines) of variable length and angle on a cathode ray tube with the beam deflection rate being substantially constant regardless of line length or angle. Each line is defined by its starting point and deflection components DELTA X and DELTA Y) along axes in a rectangular coordinate system. Two binary numbers identify the deflection components. Both numbers are shifted to the left in respective DELTA X and DELTA Y registers until a "one" in one of the numbers reaches the leftmost stage in its register. This number corresponds to a deflection component along the "major" axis, i.e., the axis with the larger deflection. X and Y multiplying digital-to-analog converters receive a common ramp voltage and the respective shifted numbers. The larger number, after being shifted, controls the ramp voltage slope so an output signal from the multiplying digital-to-analog converter associated with the major axis has a constant slope when any length line is drawn. Hence, all lines are drawn with the same constant velocity component along the major axis. [US3800183A]
IE927/73A 1972-06-08 1973-06-07 Display device with means for drawing vectors IE38117B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00260897A US3800183A (en) 1972-06-08 1972-06-08 Display device with means for drawing vectors

Publications (2)

Publication Number Publication Date
IE38117L IE38117L (en) 1973-12-08
IE38117B1 true IE38117B1 (en) 1978-01-04

Family

ID=22991105

Family Applications (1)

Application Number Title Priority Date Filing Date
IE927/73A IE38117B1 (en) 1972-06-08 1973-06-07 Display device with means for drawing vectors

Country Status (7)

Country Link
US (1) US3800183A (en)
JP (1) JPS4963344A (en)
CA (1) CA998756A (en)
DE (1) DE2329446A1 (en)
FR (1) FR2188877A5 (en)
GB (1) GB1393653A (en)
IE (1) IE38117B1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115863A (en) * 1976-12-07 1978-09-19 Sperry Rand Corporation Digital stroke display with vector, circle and character generation capability
US4298945A (en) * 1978-05-12 1981-11-03 Eltra Corporation Character generating method and apparatus
US4199815A (en) 1978-05-12 1980-04-22 Electra Corporation Typesetter character generating apparatus
US4218751A (en) * 1979-03-07 1980-08-19 International Business Machines Corporation Absolute difference generator for use in display systems
US4254468A (en) * 1979-05-03 1981-03-03 Eltra Corporation Typesetter character generating apparatus
US4365305A (en) * 1981-01-05 1982-12-21 Western Electric Company, Inc. Vector generator for computer graphics
US4491925A (en) * 1981-06-19 1985-01-01 Raytheon Company Precision time tracking line generator
US4500879A (en) * 1982-01-06 1985-02-19 Smith Engineering Circuitry for controlling a CRT beam
US4532504A (en) * 1982-09-09 1985-07-30 Sperry Corporation Slew length timer
US4686642A (en) * 1984-10-18 1987-08-11 Etak, Inc. Method and apparatus for generating a stroke on a display

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544835A (en) * 1966-04-15 1970-12-01 Ametek Inc Digitally controlled generation of a trace
US3582705A (en) * 1969-07-15 1971-06-01 Information Int Inc Vector display system
US3586874A (en) * 1969-08-13 1971-06-22 Gen Electric Integrated circuit periodic ramp generator

Also Published As

Publication number Publication date
JPS4963344A (en) 1974-06-19
GB1393653A (en) 1975-05-07
CA998756A (en) 1976-10-19
US3800183A (en) 1974-03-26
FR2188877A5 (en) 1974-01-18
IE38117L (en) 1973-12-08
DE2329446A1 (en) 1973-12-20

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