EP0189140A2 - Système de commande pour des dispositifs d'affichage à balayage à trame - Google Patents

Système de commande pour des dispositifs d'affichage à balayage à trame Download PDF

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Publication number
EP0189140A2
EP0189140A2 EP86100588A EP86100588A EP0189140A2 EP 0189140 A2 EP0189140 A2 EP 0189140A2 EP 86100588 A EP86100588 A EP 86100588A EP 86100588 A EP86100588 A EP 86100588A EP 0189140 A2 EP0189140 A2 EP 0189140A2
Authority
EP
European Patent Office
Prior art keywords
character
signals
image
memory
bwsp
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.)
Withdrawn
Application number
EP86100588A
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German (de)
English (en)
Other versions
EP0189140A3 (fr
Inventor
Bernd Dipl.-Ing.(Fh) Kretzschmar
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0189140A2 publication Critical patent/EP0189140A2/fr
Publication of EP0189140A3 publication Critical patent/EP0189140A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/30—Control of display attribute
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed

Definitions

  • the invention relates to a control for raster vision devices according to the preamble of claim 1.
  • Refresh memories are known, e.g. B. from the magazine "Electronics" 1980, Issue 21, pages 107 to 114, in which each pixel on the screen of a display device working according to the line screening method is assigned a memory cell in which the representation such as brightness, color of the associated pixel in coded form is saved.
  • the cell contents of the image repetition memory are read out cyclically in synchronism with the scanning of the line screen and fed to a color table in which they are decoded. In a subsequent digital / analog conversion, the video signals for the three primary colors are obtained.
  • Such pixel-graphic display devices have the advantage that they can be used to display virtually any image. However, they require a great deal of effort and the image construction takes a long time.
  • the images are often built up in raster display devices in such a way that the screen is divided into character fields which each consist of several pixels.
  • the contents of the character fields are coded as character signals.
  • a character generator is used for decoding.
  • Attribute signals can be added to the character signals. For example, specify the colors in which the character and background should be rendered.
  • Such semigraphic viewing devices have the Disadvantage that the freedom of movement of the image is limited.
  • the present invention has for its object to provide a display device control, which combines the advantage of the speed of semigraphic display devices with the advantage of any image display of pixel-graphic display devices with not significantly increased effort.
  • the problem essentially consists in quickly entering the attribute signals for the color of the character and its background depending on the output signals of the character generator into the image repetition memory for each character field.
  • a first attribute signal could be made available in a register in a first write-in process and entered from there into the image repetition memory as a function of the output signals of the character generator.
  • a second write-in process could be carried out accordingly with a second attribute signal.
  • Such a solution would have the advantage of little circuitry, but the disadvantage of the large amount of time required for two writes.
  • the object described above is achieved according to the invention with the measures specified in the characterizing part of claim 1.
  • the new display control which allows a high working speed with little effort, consists essentially in the fact that the output signals of the character generator and a uniform attribute signal per character field in the image repetition memory can be entered.
  • the distinction between the color of the character and that of the character background is only made in the color table. This solution may require an expansion of the image repetition memory and the color table; however, this is far less expensive than a multiplexer with 16 to 64 stages.
  • PR is a processor that forms a visual computer with an image memory BSP.
  • image memory BSP together with signals A0, Al ... Ai ..., which can be the image memory addresses
  • signal combinations are contained, namely in a first part ZC of the cell a character signal which indicates the shape of a character to be displayed, and in one second part AT attribute signals, of which the first six digits indicate the color of the character and the second six digits indicate the color of the background.
  • the attribute signals are entered in decoded form. In general, however, the attribute signals will be encoded to save memory space.
  • the signals or addresses A0, Al ... indicate in which character field on the screen of the display device SG the cell content is to be displayed. It is therefore z. B.
  • Each drawing field consists of several pixels, in the simplified example 5 x 5 points.
  • the picture Since the screen only has a short persistence, the picture must be cyclical, e.g. B. be refreshed with a repetition frequency of 50 Hz.
  • an image repetition memory BWSP is available, the cells P0, Pl, P2 ... each are assigned to a pixel, expediently in the order in which the pixels are scanned. This means that the content of cell PO is shown in the pixel located in the upper left corner of the screen, the content of cell P1 in the pixel located to the right, etc.
  • the number of pixels per line is e.g.
  • the image repetition memory BWSP is thus read out cyclically, its content being decoded in a color table FT, the output signals of which are converted into color video signals in a digital / analog converter.
  • the processor PR reads out the information, forming base addresses for the image repetition memory BWSP from the character field numbers Ai and encoding the attribute information contained in the area AT, e.g. B. in the signal combination 110.
  • the content of the area ZC of the image memory BSP is supplied to a character generator ZG as the base address, which is supplemented by subaddresses 000, 001 ... 100, which correspond to the raster lines of the character fields.
  • the shape of the character to be displayed in the example a cross or a "+" character, is stored in the memory cells with the addresses thus formed.
  • the contents of these cells are successively stored in the BWSP image repetition memory taken over, as already mentioned above, under addresses determined by the character field Ai. For speed reasons, the contents of several cells are expediently transmitted in parallel.
  • the upper left pixel of the character field Ai is assigned to the cell Pn, so that the signals "0", “0", “1”, “0", “0” are entered in the cells Pn ... Pn + 4.
  • "110" is written into each of these cells as an attribute signal.
  • the signals for the second line of the drawing field Ai are entered in cells Pz + n, Pz + n + 1 ... Pz + n + 4 and the third line of the drawing field in cells P2z + n ..
  • the four-digit signal combinations "0110” and "1110" contained in the BWSP refresh memory indicate two different colors, which can be selected by loading the color table FT appropriately.
  • the character and the character background are thus represented in different colors, one of which is described with the decoded digital number "10", “11”, “00” and the other with "00", "01”, "11", where a pair of binary signals indicate the brightness of a basic color.
  • the invention has been described using a very simple example. However, it can also be used if more than two colors are to appear in a drawing field.
  • the character generator ZG does not emit a signal of one bit per pixel, but of two or more bits.
  • Corresponding storage space must then also be made available in the image repetition memory.
  • the attribute information also need not only specify colors, but can also contain information about brightness, blinking, blinking frequency, blinking phase and the like. It can then z. B. also weaken the so-called staircase effect, which occurs when a line intersects the raster lines at an acute angle, in which in the transition area from one cell to the next pixels in both lines are displayed with reduced brightness. It can apparently improve the character resolution.
EP86100588A 1985-01-24 1986-01-17 Système de commande pour des dispositifs d'affichage à balayage à trame Withdrawn EP0189140A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3502314 1985-01-24
DE3502314 1985-01-24

Publications (2)

Publication Number Publication Date
EP0189140A2 true EP0189140A2 (fr) 1986-07-30
EP0189140A3 EP0189140A3 (fr) 1990-05-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100588A Withdrawn EP0189140A3 (fr) 1985-01-24 1986-01-17 Système de commande pour des dispositifs d'affichage à balayage à trame

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EP (1) EP0189140A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004461A1 (fr) * 1986-12-05 1988-06-16 Ncr Corporation Appareil pour commander l'affichage de caracteres au moyen d'attributs visuels appliques a ces derniers
US5012232A (en) * 1986-12-05 1991-04-30 Ncr Corporation Bit mapped memory plane with character attributes for video display
CN114338787A (zh) * 2021-12-30 2022-04-12 重庆天智慧启科技有限公司 一种智能消防报警系统及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847390A1 (de) * 1978-11-02 1980-05-08 Hartmann & Braun Ag Verfahren zur darstellung mehrfarbiger zeichen auf dem bildschirm eines datensichtgeraetes
WO1982001614A1 (fr) * 1980-10-27 1982-05-13 Equipment Corp Digital Generateur d'image graphique et de texte pour un affichage a balayage a canevas
US4364037A (en) * 1981-06-15 1982-12-14 Cromemco Inc. Transition data image processor
WO1983002509A1 (fr) * 1982-01-18 1983-07-21 Honeywell Inc Procede et appareil de commande de l'affichage d'un systeme graphique a trame genere par ordinateur
EP0099469A2 (fr) * 1982-06-24 1984-02-01 Loewe Opta Gmbh Dispositif de représentation de textes, graphiques et symboles sur des écrans de moniteurs et/ou avec des imprimantes par points

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847390A1 (de) * 1978-11-02 1980-05-08 Hartmann & Braun Ag Verfahren zur darstellung mehrfarbiger zeichen auf dem bildschirm eines datensichtgeraetes
WO1982001614A1 (fr) * 1980-10-27 1982-05-13 Equipment Corp Digital Generateur d'image graphique et de texte pour un affichage a balayage a canevas
US4364037A (en) * 1981-06-15 1982-12-14 Cromemco Inc. Transition data image processor
WO1983002509A1 (fr) * 1982-01-18 1983-07-21 Honeywell Inc Procede et appareil de commande de l'affichage d'un systeme graphique a trame genere par ordinateur
EP0099469A2 (fr) * 1982-06-24 1984-02-01 Loewe Opta Gmbh Dispositif de représentation de textes, graphiques et symboles sur des écrans de moniteurs et/ou avec des imprimantes par points

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004461A1 (fr) * 1986-12-05 1988-06-16 Ncr Corporation Appareil pour commander l'affichage de caracteres au moyen d'attributs visuels appliques a ces derniers
US5012232A (en) * 1986-12-05 1991-04-30 Ncr Corporation Bit mapped memory plane with character attributes for video display
CN114338787A (zh) * 2021-12-30 2022-04-12 重庆天智慧启科技有限公司 一种智能消防报警系统及方法
CN114338787B (zh) * 2021-12-30 2023-07-04 重庆天智慧启科技有限公司 一种智能消防报警系统及方法

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Publication number Publication date
EP0189140A3 (fr) 1990-05-30

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