EP0328164A2 - Cathode pour dispositif plat de visualisation à faisceau d'électrons - Google Patents
Cathode pour dispositif plat de visualisation à faisceau d'électrons Download PDFInfo
- Publication number
- EP0328164A2 EP0328164A2 EP89106228A EP89106228A EP0328164A2 EP 0328164 A2 EP0328164 A2 EP 0328164A2 EP 89106228 A EP89106228 A EP 89106228A EP 89106228 A EP89106228 A EP 89106228A EP 0328164 A2 EP0328164 A2 EP 0328164A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wires
- cathode
- anode
- wire
- plane
- 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.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
- H01J31/123—Flat display tubes
- H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
- H01J31/126—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using line sources
Definitions
- the invention relates to a cathode arrangement for a flat electron beam image display device.
- it is about a cathode arrangement with a plurality of cathode wires between a counter electrode and a pull anode.
- a cathode arrangement with counter electrode, cathode wires and pull anode is known from JP 60-185343 A.
- the counter electrode is segmented in order to be able to compensate for location-dependent emission differences with the aid of a location-dependent counter electrode voltage, such as occur along each cathode wire due to a potential drop from the edge to the center of the wire.
- each cathode wire in the pull anode In both known cathode arrangements, a single transmitting line is assigned to each cathode wire in the pull anode. In the initially mentioned arrangement, numerous holes are arranged along a row in the train anode. In the other arrangement, each train anode row is formed by a slot.
- the traction anode is constructed in such a way that it no longer has only one pass line for each heating wire, but rather each has several pass lines.
- two adjacent pulling wires and two adjacent focusing wires run in different planes. With the help of these wires, electrons are made a respective cathode wire is drawn and they are deflected so that they pass successively through different pass lines in the pull anode.
- two puller wires are placed at a positive voltage in relation to a heating wire so that it emits electrons.
- a negative voltage is applied to the focusing wires. Focusing must take place in the area where the electrons emerge from the heating wire, which is why the focusing wires, like the heating wires, lie behind the pulling wires.
- FIG. 1 shows a schematic section through an image display device in the row direction (viewing direction is the column direction).
- a front plate 1 forms, with a trough 2 arranged on its rear side, a closed housing which is evacuated. There is a coating of phosphorus on the inside of the front panel, of which only six pixels 3 are shown.
- a control arrangement 4 is attached, which will not be discussed in detail here. This is followed by a pull anode 5 which is perforated in accordance with the pixels on the front plate 1.
- a counter electrode 6 is applied to the inside of the tub 2. In front of it, there are heating wires 7 coated in a periodic arrangement, all of them lying in a plane parallel to the counterelectrode 6.
- the longitudinal extension of the heating wires 7 is at right angles to the plane of the drawing. In further levels between the heating wires 7 and the pulling anode 5 there are focusing wires 8, pulling wires 9 and shaped wires 10. All heating wires 7, focusing wires 8, pulling wires 9 and shaped wires 10 run parallel to one another.
- a flat cathode can be simulated for a flat image display device.
- the counter electrode 6 and the heating wires 7 are at a potential of 0 volts.
- the heating wires 7 are only energized for the time of the line return and then emit electrons in the time of the line traversing.
- the heating wires can also be energized only during the image change time. There is a positive voltage in the range of 150-500 V at the pulling wires 9, as a result of which the electrons are accelerated in the direction of the pulling wires 9.
- This sheet-like electron beam passes through the holes arranged in rows in the pulling anode 5 and through the control arrangement 4 and then strikes the pixels located in one row.
- a voltage is applied to the shaped wires 10 which is opposite the voltage to the Pull wires 9 is negative and for example - 40 V.
- these and / or the shaped wires 10 are subjected to deflection voltages which change in such a way that the leaf-shaped electron beam of each heating wire 7 successively strikes successive lines. This makes it possible to draw electrons from only one heating wire at a time and to block the electron emission from the other heating wires. This is achieved in that only the two pulling wires 9 adjacent to the respective heating wire are supplied with the positive voltage and the other pulling wires are at zero potential. When the last line in the area of the respective heating wire 7 is reached, the next heating wire 7 is switched over. The deflection voltage on the focusing wires 8 and / or shaped wires 10 is now changed so that the sheet-shaped electron beam now generated hits the first line for this heating wire 7.
- the electrode beam is switched from line to line as described. By removing electrons from only one heating wire 7 in each case, a very large reduction in the power loss is achieved. Due to the pulsed energization of the heating wire that is switched on, the potential freedom of the heating wires is achieved during the image display.
- the distance between the heating wires 7 and the counter electrode 6 should be chosen as large as possible so that a change in position of the heating wires shows the least possible influence. Each the greater this distance, the greater the absolute value of the negative voltage at the counter electrode.
- the brightness control for individual pixels can either take place with the aid of a segmented counterelectrode, as described in DE 35 29 041 A1, or in that the brightness of the electron beams output by the cathode arrangement is varied by a subsequent electrode, as in the EP A-0 079 607.
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19890106228 EP0328164A3 (fr) | 1985-11-21 | 1986-11-18 | Cathode pour dispositif plat de visualisation à faisceau d'électrons |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3541164 | 1985-11-21 | ||
| DE19853541164 DE3541164A1 (de) | 1985-11-21 | 1985-11-21 | Flache bildwiedergabevorrichtung |
| EP19890106228 EP0328164A3 (fr) | 1985-11-21 | 1986-11-18 | Cathode pour dispositif plat de visualisation à faisceau d'électrons |
Related Parent Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86115973.9 Division | 1986-11-18 | ||
| EP86115973A Division EP0226817A3 (fr) | 1985-11-21 | 1986-11-18 | Tube-image plat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0328164A2 true EP0328164A2 (fr) | 1989-08-16 |
| EP0328164A3 EP0328164A3 (fr) | 1990-10-31 |
Family
ID=25838045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19890106228 Ceased EP0328164A3 (fr) | 1985-11-21 | 1986-11-18 | Cathode pour dispositif plat de visualisation à faisceau d'électrons |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0328164A3 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119442A1 (de) * | 1981-05-15 | 1982-12-09 | Siemens AG, 1000 Berlin und 8000 München | Flache bildwiedergaberoehre |
| JPS5884581A (ja) * | 1981-11-16 | 1983-05-20 | Matsushita Electric Ind Co Ltd | 画像表示装置 |
| JPS60185343A (ja) * | 1984-03-02 | 1985-09-20 | Matsushita Electric Ind Co Ltd | 平板型表示装置 |
-
1986
- 1986-11-18 EP EP19890106228 patent/EP0328164A3/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP0328164A3 (fr) | 1990-10-31 |
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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 |
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| AC | Divisional application: reference to earlier application |
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| AK | Designated contracting states |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA UNTERHALTUNGSELEKTRONIK (DEUTSCHLAND) GMBH |
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| PUAL | Search report despatched |
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| 17P | Request for examination filed |
Effective date: 19901119 |
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| 17Q | First examination report despatched |
Effective date: 19930623 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
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| 18R | Application refused |
Effective date: 19931217 |