EP0062702A1 - Dispositif d'affichage de caractères sur un écran - Google Patents

Dispositif d'affichage de caractères sur un écran Download PDF

Info

Publication number
EP0062702A1
EP0062702A1 EP81109428A EP81109428A EP0062702A1 EP 0062702 A1 EP0062702 A1 EP 0062702A1 EP 81109428 A EP81109428 A EP 81109428A EP 81109428 A EP81109428 A EP 81109428A EP 0062702 A1 EP0062702 A1 EP 0062702A1
Authority
EP
European Patent Office
Prior art keywords
characters
colors
arrangement according
control unit
relatively
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
EP81109428A
Other languages
German (de)
English (en)
Other versions
EP0062702B1 (fr
Inventor
Otmar Popp
Bernhard Gutmann
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
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0062702A1 publication Critical patent/EP0062702A1/fr
Application granted granted Critical
Publication of EP0062702B1 publication Critical patent/EP0062702B1/fr
Expired legal-status Critical Current

Links

Images

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
    • 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 an arrangement for displaying characters on a screen of a display unit, by means of which the characters can be displayed in different colors and by means of which, in addition to the characters, multicolored graphic patterns and / or multicolored television images can also be displayed.
  • the screen content which is referred to as the page, is divided, for example, into 960 character fields, which are arranged in 24 lines with 40 character fields each.
  • the character field consists of 8x10 or 8x12 pixels, by means of which the individual characters are displayed.
  • the same grid can also be used to display fine graphic characters that can span one or more character fields.
  • each field is divided into 2x3 graphic elements and the graphic patterns can be constructed from the possible combinations of light and dark graphic elements.
  • the characters and graphic patterns can be displayed in the basic colors common to television, red, green and blue and their complementary colors yellow, cyan and magenta as well as in white and black. In the display, these colors can also be selected as background colors.
  • the invention is therefore based on the object of specifying an arrangement by means of which a particularly good readability of characters with different colors is achieved on a screen of a display unit.
  • the object is achieved in the arrangement of the type mentioned in the introduction in that a control unit is provided which, when characters with relatively dark colors are displayed, brightens these colors relative to the relatively bright colors that can be represented.
  • the arrangement according to the invention has the advantage that it requires little effort and can be easily installed in existing display units. A pleasant picture appears on the screen for the viewer. Compared to an increase in the overall brightness, the arrangement has the advantage that flickering of the relatively bright colors is avoided and that . Colors in the representation of the graphic patterns or the television pictures are not changed. The hue is also retained when the characters are displayed, since the colors are only brightened up. The mixed colors are not changed and the color contrast is therefore also retained.
  • control unit emits control signals to the display unit when the characters are displayed in the relatively dark colors, by means of which these colors are brightened. It is particularly advantageous here if the control signals increase the brightness of the characters shown by adding corresponding portions of the primary colors.
  • control unit increases the overall brightness of the display on the screen when displaying the characters in the relatively dark colors and generates signals by means of which the brightness of the displayed relatively bright colors is reduced.
  • a decoding unit which outputs ordered color signals to the characters to be displayed and which contains an image memory in which data words associated with the characters and the associated colors are stored
  • the control unit has a converter contains, which converts the relatively dark colors associated first code words into second code words which are assigned to the corresponding lightened colors. It is particularly advantageous that the converter is connected upstream of the image memory, in which the second code words can be stored instead of the first code words. Another possibility is that the converter is arranged between the image memory and an image repetition memory. The image repetition memory does not have to contain the content of a complete page. For example, it may be sufficient if only the content of one line is stored in the image repetition memory.
  • Good readability of the characters can also be achieved in that the display unit displays the characters with an increased frame rate and that the characters with the relatively dark colors are displayed more frequently than the characters with relatively bright colors or that the control unit emits signals to the display unit by means of which the brightness signals in the representation of the characters in relation moderately bright colors are periodically blocked temporarily.
  • control unit when using a flat screen, in which the display is carried out using a large number of illuminated dots, it is advantageous for the control unit to generate signals which, when the characters with the relatively dark colors are displayed, trigger a display with more illuminated dots on the display unit than when displaying the characters with the relatively bright colors.
  • the arrangement is used in an advantageous manner when the primary colors blue and red are provided as relatively dark colors and when the colors white, yellow and cyan are provided as relatively bright colors.
  • control unit Since the brightness of the characters with the primary colors blue and red are different, it is advantageous if the control unit generates signals by means of which the primary color blue is brightened more than the primary color red relative to the relatively bright colors.
  • An application of the arrangement proves to be particularly useful if alphanumeric characters and / or linear graphical characters are provided as characters.
  • a particularly advantageous representation of the characters on the screen is achieved if the relative brightening of the relatively dark colors occurs only when the characters have a dark background color.
  • characters AZ and GZ and a graphic pattern GM are shown in the section from a teletext page shown in FIG. 1, characters AZ and GZ and a graphic pattern GM are shown.
  • Alphanumeric characters AZ and a graphic character GZ formed from fine lines are shown as characters.
  • the characters AZ and GZ and the graphic pattern GM are arranged in character fields ZF, the limits of which are shown only for reasons of clarity, but are not visible on the screen.
  • Each character field ZF is divided into an invisible grid of 8x12 pixels BP when characters are displayed. Because of the different. Brightness of the pixels BP, the characters AZ are displayed on the screen.
  • the graphic characters GZ can be displayed in the same grid as the alphanumeric characters AZ. You can also span several ZF character fields.
  • the characters AZ and GZ can be displayed in the three primary colors red, green, blue, the mixed colors yellow, cyan and magenta and in the colors black and white. However, the color cannot be changed within a ZF drawing field.
  • the basic colors, the mixed colors and the colors black and white can also be used as the background.
  • the character fields ZF are divided into 2x3 graphic elements GE.
  • the graphic patterns GM are then represented from character fields ZF with different combinations of the graphic elements GE.
  • the graphic elements GE and the background color can also assume the basic colors, the mixed colors and the colors black and white.
  • the characters AZ and GZ are displayed on the screen in relatively dark colors such as red or blue, there is a risk, particularly in the case of a dark background, that the characters AZ, GZ are not clearly legible. This is particularly the case if, as shown in FIG. 1, a graphic pattern GM, for example with a relatively bright color, such as white, yellow or cyan, comes very close to the characters AZ or GZ in blue or red color.
  • a control unit SE is arranged between an image control unit BST and a display unit AE which is provided with the screen.
  • the image control unit BST is designed in a known manner. It contains switching units via which color signals coming from a television receiver or color signals coming from a teletext decoder can be switched through to the display unit AE. Switching units of this type are generally known and are described, for example, in the journal "Wireless World” May 1976, pages 64-68.
  • the color signals R, G and B assigned to the primary colors red, green and blue are supplied to the display unit AE via delay elements V.
  • the color signals R, G, B are supplied to the control unit SE.
  • the color signals are analog signals, the instantaneous values of which determine the colors to be displayed and their brightness.
  • the color signals are binary signals that assume the binary values 0 or 1. In the representation of the color red, for example, only the color signal R has the binary value 1. In a corresponding manner, in the representation of the color blue or green only the color signal B or G has the binary value 1.
  • the color black is represented in that all color signals have the binary value 0 and when displaying the color white, all color signals have the binary value 1.
  • the mixed colors yellow, cyan and magenta are represented in that the color signals R and G, G and B or R and B have the binary value 1 .
  • the teletext decoder determines that a teletext page is to be displayed, the corresponding color signals R, G and B are supplied to the display unit AE.
  • the color signals are supplied to the display unit AE in a known manner.
  • the image control unit BST When representing alphanumeric characters AZ or graphic characters GZ, the image control unit BST generates corresponding signals SAZ or SGZ. If one of these signals occurs, an OR gate G1 in the control unit SE outputs a signal S1 to two AND gates U1 and U2. If the characters are to be displayed in blue color, the color signal B has the binary value 1, while the color signals R and G have the binary values 0.
  • the AND gate U1 outputs a signal S2 via a switching stage SS1 and an analog OR gate G2 as signal S3 to the display unit AE.
  • this signal S3 which serves as a brightness signal
  • the blue characters are lightened relative to the relatively bright colors, such as white, yellow or cyan.
  • the brightening can take place in a known manner in that portions of the primary colors red and green are generated by corresponding additional color signals in the display unit AE. It is also possible to supply the signal S3 to the grid of a picture tube designed as a cathode ray tube in order to increase the brightness.
  • a signal S4 is generated by means of the AND gate U2, which brightens them when the characters are displayed in red color.
  • the amplitude of the signals S2 or the signals S4 and thus the signals S3 can be changed so that the basic colors red and blue can be brightened to different extents. It is particularly advantageous here if the blue color is lightened more than the red color.
  • the delay elements V are to compensate for. Additional transit times are provided, which arise through the AND gates U1 and U2, through the switching stages 'SS1 and SS2 and the OR gate ' G2, so that the signals S3 occur simultaneously with the corresponding color signals.
  • control unit SE it is achieved in a simple manner that when displaying characters in the relatively continuous colors red and blue, these are brightened relative to the relatively bright colors.
  • the relative brightening of the relatively dark colors can also take place in that the display unit AE is designed for a higher frame rate and that the characters AZ and GZ are displayed with relatively bright colors with a lower frame rate than the characters AZ and GZ with relatively dark colors.
  • a higher frame rate is set with signal S3, so that the relatively dark colors then appear brightened.
  • a screen formed from a multiplicity of luminous dots for example a flat screen
  • the relative brightening of the relatively dark colors can take place in that the relatively bright colors are displayed with a smaller number of luminous dots, while the signal S3 is caused that correspondingly more luminous dots are used in the representation of the characters in the relatively dark colors.
  • the relative brightening of the relatively dark colors is achieved by increasing the overall brightness when displaying teletext pages and by selectively darkening the relatively bright colors when displaying graphic patterns GM or when displaying background colors .
  • the videotex decoder in the image control unit BST again outputs the signals SAZ and SGZ.
  • the signals SAZ and SGZ each have the binary value 0, so that three AND gates U3 to U5 are enabled.
  • the AND gates U3, U4 or U5 emit a signal S5, S6 or S7-which is transmitted via a switching stage SS3, SS4 or SS5 and an analog OR gate G3 are supplied as signal S8 to the display unit AE and darkens these colors so that the relatively dark colors appear lightened in this way relative to the relatively bright colors.
  • the delay elements V are in turn provided to compensate for the delay times by the AND elements U3 to U5, the switching stages SS3 to SS5 and the OR element G3. Switching levels SS3 to SS5 in turn can be used to set the level of darkening for each color individually.
  • the signal S8 is expediently fed to the grid of the cathode ray tube in order to reduce the brightness of the corresponding colors.
  • the signal S8 can be used to reduce the frame rate in the display of the relatively bright colors, so that the relatively dark colors also appear brightened here.
  • signal S8 can be used to reduce the number of activated illuminated dots when displaying the relatively bright colors.
  • Another way to selectively darken the relatively bright colors is to use the signal S8 to chop the corresponding brightness signal, i.e. is periodically interrupted briefly. This can be done, for example, by an AND operation with a clock signal output by an oscillator.
  • control unit SE is part of the image control unit BST. From the teletext decoder, only an image memory BSP is shown, in which data words associated with the characters to be displayed and graphic patterns are stored. These data words contain, for example, 16 binary characters, of which 8 are assigned to the alphanumeric characters AZ to be displayed or the graphic elements GE and of which a further 8 binary characters represent control characters which identify the color or the type of representation or which indicate that they are data words which are assigned to the alphanumeric characters AZ or the graphic elements GE. For the representation of the colors, first code words consisting of 3 binary characters are provided in accordance with the color signals R, G and B.
  • the image control unit is that the image memory BSP is already being expanded in such a way that second code words formed from 4 binary characters are provided for the colors.
  • the refresh memory is BWS. not required and the converter UM1 is connected upstream of the image memory BSP.
  • the converter UM2 can also be designed in such a way that, as shown in FIGS. 2 and 3, it generates additional brightness signals in accordance with the signals S3 and S8 in order to control the grid of the picture tube, the frame rate or the number of illuminated dots of a flat picture tube to change.
  • the converter UM1 can also be designed such that it passes the color signals R, G and B unchanged to the image repetition memory BWS even when characters are displayed. This can be the case, for example, if the characters are displayed on a light background.
  • the converter UM1 can contain a memory in which the background color applicable to the respective character field is temporarily stored and, depending on its content, the relatively dark colors can be brightened.
  • Such a buffer can also be used in the arrangements be provided according to Figures 2 or 3, so that in this case, the relative brightening of the relatively dark colors only takes place if they are displayed on a dark background.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Color Television Systems (AREA)
EP19810109428 1981-03-27 1981-10-30 Dispositif d'affichage de caractères sur un écran Expired EP0062702B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112249 1981-03-27
DE19813112249 DE3112249C2 (de) 1981-03-27 1981-03-27 Anordnung zum Darstellen von Zeichen an einem Bildschirm

Publications (2)

Publication Number Publication Date
EP0062702A1 true EP0062702A1 (fr) 1982-10-20
EP0062702B1 EP0062702B1 (fr) 1985-10-09

Family

ID=6128524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810109428 Expired EP0062702B1 (fr) 1981-03-27 1981-10-30 Dispositif d'affichage de caractères sur un écran

Country Status (3)

Country Link
EP (1) EP0062702B1 (fr)
CA (1) CA1200631A (fr)
DE (1) DE3112249C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271952A1 (fr) * 1986-12-15 1988-06-22 Koninklijke Philips Electronics N.V. Unité d'affichage multicouleur, comportant un dispositif de commande pour la sélection de couleurs

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4965825A (en) 1981-11-03 1990-10-23 The Personalized Mass Media Corporation Signal processing apparatus and methods
US7831204B1 (en) 1981-11-03 2010-11-09 Personalized Media Communications, Llc Signal processing apparatus and methods
USRE47642E1 (en) 1981-11-03 2019-10-08 Personalized Media Communications LLC Signal processing apparatus and methods
US4931785A (en) * 1986-06-17 1990-06-05 Ascii Corporation Display apparatus
US5140312A (en) * 1986-06-17 1992-08-18 Ascii Corporation Display apparatus
US5339094A (en) * 1987-08-11 1994-08-16 Murrell Nicholas J VDU line marker
DE3910486C2 (de) * 1989-03-31 1996-10-02 Siemens Ag Echtzeitverfahren zur Darstellung von Farbinformationen auf Schwarzweißmonitoren
JP3025809B2 (ja) * 1989-08-11 2000-03-27 インターナシヨナル・ビジネス・マシーンズ・コーポレーシヨン 表示装置
DE4029163C1 (fr) * 1990-09-14 1992-01-02 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig Hollaend. Stiftung & Co Kg, 8510 Fuerth, De
JPH0573249A (ja) * 1991-09-12 1993-03-26 Toshiba Corp 表示制御装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829613A (en) * 1972-12-29 1974-08-13 Cit Alcatel Color intensity control system
EP0004197A2 (fr) * 1978-03-13 1979-09-19 Rca Corporation Dispositif d'affichage du type télévision de signaux vidéo ou de signaux graphiques
DE2829431A1 (de) * 1978-07-05 1980-01-17 Saba Gmbh Schaltungsanordnung zum einblenden von zeichen in verschiedenen farben auf dem bildschirm eines sichtgeraetes
DE2946953A1 (de) * 1979-11-21 1981-06-04 Loewe Opta Gmbh, 8640 Kronach Farbmonitor mit einer schaltungsanordnung zur einblendung farbiger alphanumerischer zeichen und/oder graphischer symbole

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2803746C2 (de) * 1978-01-28 1980-06-26 Saba Gmbh, 7730 Villingen Schaltungsanordnung zum Einblenden von Zeichen in verschiedenen Farben auf dem Bildschirm eines Sichtgerätes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3829613A (en) * 1972-12-29 1974-08-13 Cit Alcatel Color intensity control system
EP0004197A2 (fr) * 1978-03-13 1979-09-19 Rca Corporation Dispositif d'affichage du type télévision de signaux vidéo ou de signaux graphiques
DE2829431A1 (de) * 1978-07-05 1980-01-17 Saba Gmbh Schaltungsanordnung zum einblenden von zeichen in verschiedenen farben auf dem bildschirm eines sichtgeraetes
DE2946953A1 (de) * 1979-11-21 1981-06-04 Loewe Opta Gmbh, 8640 Kronach Farbmonitor mit einer schaltungsanordnung zur einblendung farbiger alphanumerischer zeichen und/oder graphischer symbole

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271952A1 (fr) * 1986-12-15 1988-06-22 Koninklijke Philips Electronics N.V. Unité d'affichage multicouleur, comportant un dispositif de commande pour la sélection de couleurs

Also Published As

Publication number Publication date
CA1200631A (fr) 1986-02-11
DE3112249C2 (de) 1986-09-18
EP0062702B1 (fr) 1985-10-09
DE3112249A1 (de) 1982-10-07

Similar Documents

Publication Publication Date Title
DE3788401T2 (de) Anzeigegerät.
DE2932525C2 (fr)
DE69123604T2 (de) Elektrophoretische anzeigetafel unter verwendung von graustufenfähigkeit mit flächenmodulation
DE68906051T2 (de) Farbanzeigegeraet.
DE2851772C2 (de) Schaltungsanordnung für ein Farbdatensichtgerät
DE69019778T2 (de) Anzeigesystem für Instrumente.
DE19811022A1 (de) Aktivmatrix-Flüssigkristallanzeige
DE2063243C3 (de) Einrichtung zur farbigen Wiedergabe von Bildzeilen auf einem Bildschirm eines Datensichtgerätes
DE3736195A1 (de) Raster-scan-videoanzeigegeraet
EP0062702B1 (fr) Dispositif d'affichage de caractères sur un écran
EP0005178B1 (fr) Circuit pour améliorer la qualité des caractères d'un dispositif d'affichage à balayage à trame
DE3232223A1 (de) Verfahren und schaltungsanordnung zur verringerung des flimmerns bei video-wiedergabeeinrichtungen mit ineinandergeschobenen halbbildern
DE2951447C2 (de) Anzeigeeinrichtung zur Darstellung von in Spalten und Zeilen angeordneten Rasterpunkten von Zeichenmustern
DE1914764B2 (de) Schaltungsanordnung zur Formatge staltung der Darstellung von Symbolen auf lichtausstrahlenden Flachen
EP0006131A1 (fr) Procédé de transmission d'enregistrements contenant des représentations mixtes à un écran de visualisation, particulièrement dans des installations téléphoniques
DE3516416C2 (fr)
DE3240473A1 (de) Verfahren zur wiedergabe von bildschirmtext-seiten auf dem monochromen bildschirm eines grautonfaehigen fernsehmonitors
EP0954175B1 (fr) Télétexte comprenant la fonction de transparence
DE4432175B4 (de) Videosignalverarbeitungseinrichtung für OSD-Signale
DE4029163C1 (fr)
DE2520378A1 (de) Positionsprogrammierte farbbildroehre
DE69929583T2 (de) Digitale Addressierung einer flachen Anzeigetafel
DE2602126C2 (de) Anzeigevorrichtung
EP0281502A1 (fr) Méthode d'affichage de couleurs individuelles en les remplaçant par des niveaux de gris
DE3415320C2 (de) Verfahren zum Ausdrucken eines farbigen Fernsehbildes

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19811030

AK Designated contracting states

Designated state(s): CH FR GB IT NL SE

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH FR GB IT LI NL SE

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19871031

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881030

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19881031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19890501

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19901022

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910124

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19911031

Ref country code: CH

Effective date: 19911031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19920630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 81109428.3

Effective date: 19890614