EP0136304A1 - Cathode ray tube for simultaneously displaying graphic and alphanumeric information - Google Patents

Cathode ray tube for simultaneously displaying graphic and alphanumeric information

Info

Publication number
EP0136304A1
EP0136304A1 EP84900762A EP84900762A EP0136304A1 EP 0136304 A1 EP0136304 A1 EP 0136304A1 EP 84900762 A EP84900762 A EP 84900762A EP 84900762 A EP84900762 A EP 84900762A EP 0136304 A1 EP0136304 A1 EP 0136304A1
Authority
EP
European Patent Office
Prior art keywords
ray tube
cathode ray
alphanumeric information
screen
information
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Withdrawn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
EP84900762A
Other languages
German (de)
French (fr)
Inventor
Stig Bertil Ram
Anders Claesson
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP0136304A1 publication Critical patent/EP0136304A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/04—Display arrangements
    • G01S7/06—Cathode-ray tube displays or other two dimensional or three-dimensional displays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/04—Display arrangements
    • G01S7/06—Cathode-ray tube displays or other two dimensional or three-dimensional displays
    • G01S7/22—Producing cursor lines and indicia by electronic means

Definitions

  • the invention refers to a cathode ray tube (CRT) for simultaneously displaying graphic and alphanumeric information.
  • CTR cathode ray tube
  • Computer systems for processing position information from radar monitoring equipment are often used for controlling and guiding air and maritime traffic. Furthermore, other kinds of information, such as route, arrival time, collision risk etc., are collected and processed. All this information is displayed to traffic controlles who, with the aid of it, control traffic in progress.
  • the radar images which are displayed are reproduced at a frequency corresponding to the rotational speed of the radar scanner, which is normally of the magnitude of one revolution per second.
  • the requirement for obtaining an acceptable display of the radar scans is that the CRT display persistence time is long. This long persistence time is a disadvantage when displaying alphanumeric information. When such information is changed the display will be blurred, due to the persistence time. Furthermore, the fluorescent coating will be destroyed if stationary information is continuously displayed. To avoid these problems the radar information is generally displayed on one CRT having a long persistence time, while the alphanumeric information is displayed on another CRT having a short perisistence time. This solution, however, is both expensive and voluminous.
  • the invention relates to a CRT, which solves the aforementioned problems with simultaneously displaying the graphic and alphanumeric information. This is done by the screen of the CRT being provided with one zone having a short, and another zone having a long persistence time.
  • the characterizing features of the invention are disclosed in claims 1 and 2.
  • Figure 1 illustrates a display screen in accordance with the invention displaying radar image and alphanumeric information.
  • a radar image of an airplane in the air is desplayed in the upper zone A of the screen.
  • Superposed on the radar image there is displayed a computer-generated image.
  • the latter is a stylized map of the area in question, airplane identification symbols etc.
  • This zone A is provided with a fluorescent coating 1 of a material with the commercial denotation P26, this coating having a persistence time of about 50 seconds. Persistence time is defined as the time it takes for luminescence to deteriorate to 5% of its initial value.
  • a computer-generated alphanumeric image is displayed in the lower zone B of the screen. It may, for example, contain information as to the route, calculated arrival time etc for different airplanes.
  • This zone B of the screen is provided with a fluorescent coating 2 with the commercial denotation P39. This coating has a persistence time of about two seconds.
  • Figure 2 illustrates the screen in length section, where the front glass 3 of the screen is provided with a fluorescent coating 1 of the material P26 over one part of its surface, and with a coating of the material P39 over another part of its surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

Tube à rayons cathodiques pour l'affichage d'informations graphiques, de préférence des images radar, ainsi que d'informations alphanumériques, de préférence de tableaux, conçu de sorte que l'écran du tube à rayons cathodiques est pourvu de revêtements fluorescents possédant des temps de persistance différents sur des parties différentes de la surface de l'écran.Cathode ray tube for displaying graphic information, preferably radar images, as well as alphanumeric information, preferably tables, designed such that the screen of the cathode ray tube is provided with fluorescent coatings having different persistence times on different parts of the screen surface.

Description

CATHODE RAY TUBE FOR SIMULTANEOUSLY DISPLAYING GRAPHIC AND ALPHANUMERIC INFORMATION
TECHNICAL FIELD
The invention refers to a cathode ray tube (CRT) for simultaneously displaying graphic and alphanumeric information.
BACKGROUND ART
Computer systems for processing position information from radar monitoring equipment are often used for controlling and guiding air and maritime traffic. Furthermore, other kinds of information, such as route, arrival time, collision risk etc., are collected and processed. All this information is displayed to traffic controlles who, with the aid of it, control traffic in progress. The radar images which are displayed are reproduced at a frequency corresponding to the rotational speed of the radar scanner, which is normally of the magnitude of one revolution per second. The requirement for obtaining an acceptable display of the radar scans is that the CRT display persistence time is long. This long persistence time is a disadvantage when displaying alphanumeric information. When such information is changed the display will be blurred, due to the persistence time. Furthermore, the fluorescent coating will be destroyed if stationary information is continuously displayed. To avoid these problems the radar information is generally displayed on one CRT having a long persistence time, while the alphanumeric information is displayed on another CRT having a short perisistence time. This solution, however, is both expensive and voluminous.
DISCLOSURE OF INVENTION
The invention relates to a CRT, which solves the aforementioned problems with simultaneously displaying the graphic and alphanumeric information. This is done by the screen of the CRT being provided with one zone having a short, and another zone having a long persistence time. The characterizing features of the invention are disclosed in claims 1 and 2.
BRIEF DESCRIPTION OF DRAWINGS
The invention, the characterizing features of which are apparent from the following patent claims, will now be described in detail with reference to the accompanying drawing, on which Figure 1 illustrates a display screen with the displayed information split up into zones, and Figure 2 illustrates a length section of the screen.
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 1 illustrates a display screen in accordance with the invention displaying radar image and alphanumeric information. A radar image of an airplane in the air is desplayed in the upper zone A of the screen. Superposed on the radar image there is displayed a computer-generated image. The latter is a stylized map of the area in question, airplane identification symbols etc. This zone A is provided with a fluorescent coating 1 of a material with the commercial denotation P26, this coating having a persistence time of about 50 seconds. Persistence time is defined as the time it takes for luminescence to deteriorate to 5% of its initial value.
A computer-generated alphanumeric image is displayed in the lower zone B of the screen. It may, for example, contain information as to the route, calculated arrival time etc for different airplanes. This zone B of the screen is provided with a fluorescent coating 2 with the commercial denotation P39. This coating has a persistence time of about two seconds.
Figure 2 illustrates the screen in length section, where the front glass 3 of the screen is provided with a fluorescent coating 1 of the material P26 over one part of its surface, and with a coating of the material P39 over another part of its surface.

Claims

1 Cathode ray tube for simultaneously displaying graphic and alphanumeric information, characterized in that the screen of the CRT is split into various zones each provided with a fluorescent coating having desired persistence time.
2 CRT as claimed in claim 1, characterized in that the screen of the CRT is split into zones, one zone (A) having a fluorescent coating (1) with a long persistence time for displaying the graphic image, and a zone (B) having a fluorescent coating (2) with a short persistence time for displaying the alphanumeric information.
OMPI
EP84900762A 1983-02-09 1984-02-01 Cathode ray tube for simultaneously displaying graphic and alphanumeric information Withdrawn EP0136304A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8300656A SE435331B (en) 1983-02-09 1983-02-09 IMAGES FOR SIMILAR PRESENTATION OF GRAPHIC AND ALPHANUMERIC INFORMATION
SE8300656 1983-02-09

Publications (1)

Publication Number Publication Date
EP0136304A1 true EP0136304A1 (en) 1985-04-10

Family

ID=20349938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84900762A Withdrawn EP0136304A1 (en) 1983-02-09 1984-02-01 Cathode ray tube for simultaneously displaying graphic and alphanumeric information

Country Status (6)

Country Link
EP (1) EP0136304A1 (en)
JP (1) JPS60500431A (en)
DK (1) DK479484A (en)
IT (1) IT8419507A0 (en)
SE (1) SE435331B (en)
WO (1) WO1984003174A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0693635B2 (en) * 1986-12-19 1994-11-16 日本電気株式会社 Small radio
FR2680933B1 (en) * 1991-08-30 1997-09-26 Sextant Avionique DEVICE FOR CONTROLLING THE LOCKING VOLTAGE OF A CATHODE RAY TUBE BY MEASURING LUMINANCE.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1510798A (en) * 1974-05-06 1978-05-17 Ball Brothers Res Corp Colour display device
FR2296336A1 (en) * 1974-12-27 1976-07-23 Thomson Csf VIDEO IMAGE DISPLAY SYSTEM AND ESPECIALLY RADAR VIDEO IMAGES ON A COLOR CATHODIC TUBE
FR2487120A1 (en) * 1980-07-18 1982-01-22 Thomson Csf Multicolour information display CRT for aircraft - uses screen coated on area with different colour compounds to provide separate monochrome display areas

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8403174A1 *

Also Published As

Publication number Publication date
SE435331B (en) 1984-09-17
WO1984003174A1 (en) 1984-08-16
DK479484D0 (en) 1984-10-05
IT8419507A0 (en) 1984-02-08
JPS60500431A (en) 1985-03-28
DK479484A (en) 1984-10-05
SE8300656L (en) 1984-08-09
SE8300656D0 (en) 1983-02-09

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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: 19840914

AK Designated contracting states

Designated state(s): DE FR GB NL

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19850326

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CLAESSON, ANDERS

Inventor name: RAM, STIG, BERTIL