EP0069994A2 - Méthode et dispositif pour l'affichage d'informations alphanumériques et graphiques sur des écrans à balayage à trame - Google Patents

Méthode et dispositif pour l'affichage d'informations alphanumériques et graphiques sur des écrans à balayage à trame Download PDF

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Publication number
EP0069994A2
EP0069994A2 EP82106105A EP82106105A EP0069994A2 EP 0069994 A2 EP0069994 A2 EP 0069994A2 EP 82106105 A EP82106105 A EP 82106105A EP 82106105 A EP82106105 A EP 82106105A EP 0069994 A2 EP0069994 A2 EP 0069994A2
Authority
EP
European Patent Office
Prior art keywords
dark
light
pulse
circuit arrangement
edges
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.)
Granted
Application number
EP82106105A
Other languages
German (de)
English (en)
Other versions
EP0069994A3 (en
EP0069994B1 (fr
Inventor
Horst Ing.Grad. Fleissner
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.)
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6136894&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0069994(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority to AT82106105T priority Critical patent/ATE16535T1/de
Publication of EP0069994A2 publication Critical patent/EP0069994A2/fr
Publication of EP0069994A3 publication Critical patent/EP0069994A3/de
Application granted granted Critical
Publication of EP0069994B1 publication Critical patent/EP0069994B1/fr
Expired legal-status Critical Current

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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
    • G09G1/002—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Definitions

  • the invention relates to a method and a circuit arrangement for improving the reproduction of alphanumeric characters and graphics on raster screens according to the preamble of claim 1.
  • Luminous dots or lines are generated by the brightness control on image display devices writing raster lines.
  • the deflection speed of the beam or light spot is generally assumed.
  • the length of a luminous line to be displayed is assumed to be the product of beam deflection speed and time according to the following formula: where 1 L is the length of a line, V Str is the beam deflection speed and t Imp is the control pulse duration for the brightness control.
  • a glowing line is therefore always longer than it should or should be, which is particularly important when it comes to the shortest occurring line, the point.
  • the reproduction quality is particularly deteriorated with dark characters on a light background.
  • the line is written shorter than required.
  • Fig. 1 illustrates this relationship.
  • the invention has for its object to improve the image impression of text and graphics on raster screens, especially when rendering dark characters on a light background, without great effort.
  • a circuit arrangement for carrying out this method is specified in claim 4.
  • a dark line can be made longer compared to a light line or a light line compared to a dark line.
  • the other pulse edge can be delayed by reversing the polarity of the diode provided in the circuit arrangement according to the invention. If the resistor provided is designed as a trimming resistor, the delay time can be set and thus adapted to different requirements.
  • Fig. 1 the pulse sequence shown above identifies the brightness control pulse.
  • the dotted continuous areas 1, 1 'located underneath and at a distance from one another represent adjacent traces of light or "lines" of the write beam.
  • the two areas 2 and 4 each mark a bright "dot” or “line” that is too wide.
  • the area 3 or dark "point” located between these two areas 2 and 4 is too narrow.
  • the control signal is deformed into a trapezoid or even a triangle, which is shown in FIG. 2, which shows a light point that is too short but a dark point that is too long .
  • the Deformation of the control pulse means that the glowing points appear shorter than the dark points or that the glowing points appear even darker than glowing lines.
  • FIG. 2a again shows the original pulse sequence (brightness control pulse) and FIG. 2b shows the pulse sequence at the output of the brightness control stage with the deformed control pulsesJ
  • FIG. 2c the two adjacent "lines" 1 and 1 'are shown again.
  • a too short "point” 5 or a too short light line 7 and a dark "point” 6 located between these two are drawn. Only the part of the impulse that generates the greatest brightness, i.e. only the line part corresponding to the tip of the triangle is actually perceived by the eye.
  • Fig. 3 which schematically illustrates the line generation of the method according to the invention
  • the original pulse sequence is shown above again (Fig. 3a).
  • the image reproduction can be improved if the pulse duration for light lines is shortened and the pulse duration for dark lines is extended.
  • FIG. 3b and according to the invention by a corrected one Pulse train in which the rising edges are delayed by ⁇ t; the pulse edge at the transition from dark to light is delayed, while the edge at the transition from light to dark remains unaffected.
  • 3c shows a bright "point” 8 and a bright line 10 corresponding to their respective associated pulses and between the two lines 8 and 10 a dark " Point "9, which is the same length as the bright" point "8.
  • the light spot has no sharply delimiting outline; rather, the brightness decreases with increasing diameter, but this is not perceived by the naked eye.
  • the visual impression is decisive for the degree of edge deceleration.
  • the deflection speed and the control pulse duration it must be dimensioned such that a light point and a dark point appear to be of the same length.
  • the limit frequency of the monitor is too low, the image impression can be improved in this case by keeping the dark-light edge unchanged while the light-dark edge is delayed.
  • the pulse does not reach the peak value and the individual illuminated dot appears darker than a line.
  • the pulse can reach the peak value and even assume a trapezoidal shape.
  • the red dot also reaches its full brightness and becomes wider.
  • FIG. 4b assigned to FIG. 4a shows a pulse diagram, the individual pulse sequences ⁇ , ⁇ , ⁇ , s of which represent the pulses occurring at the respectively marked locations in FIG. 4a.
  • the other edge can be delayed by reversing the polarity of the diode D.
  • the resistor R is designed as a trimming resistor, the delay time can be set and thus adapted to different requirements.
  • a significantly simplified structure of the circuit arrangement results if the Schmitt trigger ST is constructed, for example, in integrated TTL technology.

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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Studio Circuits (AREA)
EP82106105A 1981-07-14 1982-07-08 Méthode et dispositif pour l'affichage d'informations alphanumériques et graphiques sur des écrans à balayage à trame Expired EP0069994B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106105T ATE16535T1 (de) 1981-07-14 1982-07-08 Verfahren und schaltungsanordnung zur verbesserung der wiedergabe alpha-numerischer zeichen und grafik auf rasterbildschirmen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3127817 1981-07-14
DE19813127817 DE3127817A1 (de) 1981-07-14 1981-07-14 "verfahren und schaltungsanordnung zur verbesserung der wiedergabe alpha-numerischer zeichen und grafik auf rasterbildschirmen"

Publications (3)

Publication Number Publication Date
EP0069994A2 true EP0069994A2 (fr) 1983-01-19
EP0069994A3 EP0069994A3 (en) 1983-03-30
EP0069994B1 EP0069994B1 (fr) 1985-11-13

Family

ID=6136894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106105A Expired EP0069994B1 (fr) 1981-07-14 1982-07-08 Méthode et dispositif pour l'affichage d'informations alphanumériques et graphiques sur des écrans à balayage à trame

Country Status (4)

Country Link
EP (1) EP0069994B1 (fr)
JP (1) JPS5818683A (fr)
AT (1) ATE16535T1 (fr)
DE (2) DE3127817A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4734691A (en) * 1985-03-04 1988-03-29 International Business Machines Corporation Video bit transition advancement circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549295A (en) * 1983-06-21 1985-10-22 International Business Machines Corporation System for identifying defective media in magnetic tape storage systems
JPS6310377A (ja) * 1986-07-01 1988-01-16 Nec Corp デイスク制御装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1311283A (en) * 1969-09-12 1973-03-28 Marconi Co Ltd Electronic character generating apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4734691A (en) * 1985-03-04 1988-03-29 International Business Machines Corporation Video bit transition advancement circuit

Also Published As

Publication number Publication date
DE3267411D1 (en) 1985-12-19
EP0069994A3 (en) 1983-03-30
ATE16535T1 (de) 1985-11-15
EP0069994B1 (fr) 1985-11-13
JPS5818683A (ja) 1983-02-03
DE3127817A1 (de) 1983-02-10

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