EP0087140A2 - Method for reducing the background luminosity in the lower image region of a gas-discharge display panel - Google Patents
Method for reducing the background luminosity in the lower image region of a gas-discharge display panel Download PDFInfo
- Publication number
- EP0087140A2 EP0087140A2 EP83101569A EP83101569A EP0087140A2 EP 0087140 A2 EP0087140 A2 EP 0087140A2 EP 83101569 A EP83101569 A EP 83101569A EP 83101569 A EP83101569 A EP 83101569A EP 0087140 A2 EP0087140 A2 EP 0087140A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- cathode
- reducing
- lower image
- gas
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004904 shortening Methods 0.000 claims description 4
- 241000283986 Lepus Species 0.000 claims 1
- 230000009257 reactivity Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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
- 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
- G09G3/22—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 using controlled light sources
- G09G3/28—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/282—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using DC panels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/38—Cold-cathode tubes
- H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
- H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
- H01J17/498—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with a gas discharge space and a post acceleration space for electrons
Definitions
- the invention relates to a method for reducing the background brightness in the lower image area of a gas discharge display device.
- a gas discharge display device with a cathode which consists of a plurality of cathode strips which are isolated from one another, parallel to one another and can be controlled separately, is known from DE-OS 26 43 915.
- the division of the cathode into individual cathode strips which are insulated from one another is a further development of a surface cathode as is known from DE-OS 24 12 869 and is used for image reproduction in so-called flat screens or gas discharge displays.
- Such a display device essentially consists of a gas discharge (plasma) and a post-acceleration space, which are separated from one another by a perforated control disk provided with row and column lines.
- the cathode On the flat screen, the cathode is divided into strips parallel to the anode rows. Of these strips, only one is connected as the active cathode, one after the other from top to bottom. After switching off the bottom cathode, the top cathode should be re-ignited as soon as possible (for reasons of image brightness and flickering). If the top picture lines of the screen are now switched on (the column lines are then at potential for transmission), if the pause until the first cathode is re-ignited is not selected at least as long as the decay time of the gas discharge in the area of the last cathode occurs. Depending on the type of gas, this is in the range of a few milliseconds. This means that there should be a pause of 10 to 20% of the active image build-up time between the image runs in order to avoid this background lighting. This would lead to a corresponding reduction in screen brightness.
- the present invention is therefore based on the object of avoiding this reduction in screen brightness. To achieve this object, it is proposed according to the invention in a method of the type mentioned at the outset that the plasma is clocked after the end of the image (lower image area) backwards to the first cathode.
- the anode rows are preferably not selected individually in the plasma return phase and the first anode parts are activated during the return phase.
- An anode row is expediently activated in the corresponding cathode region.
- the image brightness is increased by shortening the dark phase between the image runs or the image change frequency is increased and thus the flickering is reduced by shortening the pause with a constant image construction time.
- the method according to the invention is to be further explained on the basis of a time course of the cathode currents shown in the figure of the drawing.
- the figure shows the time course T of the cathode currents.
- the cathodes are activated in sequence during the image build-up time T B.
- T KR can expediently be selected equal to the line selection time T Z.
- the gap between two images is then 1% of the image construction time. With helium as the filling gas, the gap without the plasma return is approx. 2.5 ms, ie approx. 20%.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Reduzierung der Untergrundhelligkeit im unteren Bildbereich einer Gasentladungsanzeigevorrichtung.The invention relates to a method for reducing the background brightness in the lower image area of a gas discharge display device.
Eine Gasentladungsanzeigevorrichtung mit einer Kathode, die aus mehreren Kathodenstreifen besteht, die voneinander isoliert parallel zueinander liegen und getrennt ansteuerbar sind, ist aus der DE-OS 26 43 915 bekannt. Die Aufteilung der Kathode in einzelne voneinander isolierte Kathodenstreifen ist eine Weiterentwicklung einer Flächenkathode, wie sie aus der DE-OS 24 12 869 bekannt ist und für die Bildwiedergabe bei sogenannten Flachbildschirmen bzw. Gasentladungs-Displays verwendet wird.A gas discharge display device with a cathode, which consists of a plurality of cathode strips which are isolated from one another, parallel to one another and can be controlled separately, is known from DE-OS 26 43 915. The division of the cathode into individual cathode strips which are insulated from one another is a further development of a surface cathode as is known from DE-OS 24 12 869 and is used for image reproduction in so-called flat screens or gas discharge displays.
Eine solche Anzeigevorrichtung besteht im wesentlichen aus einem Gasentladungs (Plasma)- und einem Nachbeschleunigungsraum, die durch eine gelochte, mit Zeilen- und Spaltenleitungen versehene Steuerscheibe voneinander getrennt sind.Such a display device essentially consists of a gas discharge (plasma) and a post-acceleration space, which are separated from one another by a perforated control disk provided with row and column lines.
Beim flachen Bildschirm wird die Kathode in zu den Anodenzeilen parallele Streifen unterteilt. Von diesen Streifen ist jeweils nur einer als aktive Kathode geschaltet, und zwar der Reihe nach von oben nach unten. Nach dem Abschalten der untersten Kathode sollte die oberste Kathode möglichst bald (aus Gründen der Bildhelligkeit und des Flimmerns) neu gezündet werden. Wenn nun die obersten Bildzeilen des Bildschirms hellgeschaltet werden (die Spaltenleitungen liegen dann auf Durcrlaβpotential), tritt ein Untergrundleuchten über der letzten Kathode auf, wenn die Pause bis zum Neuzünden der ersten Kathode nicht mindestens solange gewählt wird, wie die Abklingzeit der Gasentladung im Bereich der letzten Kathode dauert. Je nach Gasart liegt dies im Bereich einiger Millisekunden. Das heißt zwischen den Bilddurchläufen müßte eine Pause von 10 bis 20 % der-aktiven Bildaufbauzeit liegen, um dieses Untergrundleuchten zu vermeiden. Dies würde zu einer entsprechenden Reduzierung der Bildschirmhelligkeit führen.On the flat screen, the cathode is divided into strips parallel to the anode rows. Of these strips, only one is connected as the active cathode, one after the other from top to bottom. After switching off the bottom cathode, the top cathode should be re-ignited as soon as possible (for reasons of image brightness and flickering). If the top picture lines of the screen are now switched on (the column lines are then at potential for transmission), if the pause until the first cathode is re-ignited is not selected at least as long as the decay time of the gas discharge in the area of the last cathode occurs. Depending on the type of gas, this is in the range of a few milliseconds. This means that there should be a pause of 10 to 20% of the active image build-up time between the image runs in order to avoid this background lighting. This would lead to a corresponding reduction in screen brightness.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, diese Reduzierung der Bildschirmhelligkeit zu vermeiden. Zur Lösung dieser Aufgabe wird bei einem Verfahren der eingangs genannten-Art erfindungsgemäß vorgeschlagen, daß das Plasma nach dem Bildende (unterem Bildbereich) rückwärts zur ersten Kathode getaktet wird.The present invention is therefore based on the object of avoiding this reduction in screen brightness. To achieve this object, it is proposed according to the invention in a method of the type mentioned at the outset that the plasma is clocked after the end of the image (lower image area) backwards to the first cathode.
Die Anodenzeilen werden dabei vorzugsweise in der Plasmarücklaufphase nicht einzeln selektiert und die ersten Anodenteile während der Rücklaufphase aktiviert. Zweckmäßigerweise wird jeweils eine Anodenzeile im entsprechenden Kathodenbereich aktiviert.The anode rows are preferably not selected individually in the plasma return phase and the first anode parts are activated during the return phase. An anode row is expediently activated in the corresponding cathode region.
Gemäß einer Weiterbildung der Erfindung wird die Bildhelligkeit durch Verkürzen der Dunkelphase zwischen den Bilddurchläufen erhöht beziehungsweise -die Bildwechselfrequenz erhöht und damit das Flimmern bei konstanter Bildaufbauzeit durch Verkürzen der Pause reduziert.According to a further development of the invention, the image brightness is increased by shortening the dark phase between the image runs or the image change frequency is increased and thus the flickering is reduced by shortening the pause with a constant image construction time.
Anhand eines in der Figur der Zeichnung dargestellten zeitlichen Verlaufes der Kathodenströme soll das erfindungsgemäße Verfahren weiter erläutert werden. Unter der Annahme, daß der Bildschirm sechs Kathoden enthält, zeigt die Figur den zeitlichen Verlauf T der Kathodenströme. Während der Bildaufbauzeit TB werden die Kathoden der Reihe nach aktiviert. Die Auswahlzeit einer Kathode beträgt TKH = TB/6. Bei TB = 12 ms ist TKH = 2 ms. Nach dem Abschalten der sechsten Kathode werden nun die Kathoden in umgekehrter Reihenfolge eingeschaltet. Die Auswahlzeit TKR kann zweckmäßigerweise gleich der Zeilenauswahlzeit TZ gewählt werden. Die Zeit Tp zwischen Bildende und Bildanfang beträgt dann 4x TZ. Bei TZ = 30 us ist Tp = 120 /us. Die Lücke zwischen zwei Bildern beträgt dann 1 % der Bildaufbauzeit. Bei Helium als Füllgas beträgt die Lücke ohne den Plasmarücklauf ca. 2,5 ms, d.h. ca. 20 %.The method according to the invention is to be further explained on the basis of a time course of the cathode currents shown in the figure of the drawing. Assuming that the screen contains six cathodes, the figure shows the time course T of the cathode currents. The cathodes are activated in sequence during the image build-up time T B. The selection time of a cathode is T KH = T B / 6. With T B = 12 ms, T KH = 2 ms. After switching off the sixth cathode, the cathodes are now switched on in the reverse order. The selection time T KR can expediently be selected equal to the line selection time T Z. The time Tp between the end of the image and the beginning of the image is then 4x T Z. At T Z = 30 us, Tp = 120 / us. The gap between two images is then 1% of the image construction time. With helium as the filling gas, the gap without the plasma return is approx. 2.5 ms, ie approx. 20%.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823206451 DE3206451A1 (en) | 1982-02-23 | 1982-02-23 | METHOD FOR REDUCING THE UNDERGROUND BRIGHTNESS IN THE LOWER IMAGE AREA OF A GAS DISCHARGE DISPLAY DEVICE |
| DE3206451 | 1982-02-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0087140A2 true EP0087140A2 (en) | 1983-08-31 |
| EP0087140A3 EP0087140A3 (en) | 1984-05-23 |
Family
ID=6156467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83101569A Withdrawn EP0087140A3 (en) | 1982-02-23 | 1983-02-18 | Method for reducing the background luminosity in the lower image region of a gas-discharge display panel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0087140A3 (en) |
| JP (1) | JPS58160991A (en) |
| DE (1) | DE3206451A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3852215T2 (en) * | 1987-06-19 | 1995-04-06 | Toshiba Kawasaki Kk | System for controlling the display zone for a plasma display device. |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2643915A1 (en) * | 1976-09-29 | 1978-03-30 | Siemens Ag | PICTURE DISPLAY DEVICE |
| EP0031921A1 (en) * | 1979-12-28 | 1981-07-15 | Siemens Aktiengesellschaft | Gas discharge display device comprising at least one spacer frame limiting the post-acceleration space |
-
1982
- 1982-02-23 DE DE19823206451 patent/DE3206451A1/en not_active Withdrawn
-
1983
- 1983-02-18 EP EP83101569A patent/EP0087140A3/en not_active Withdrawn
- 1983-02-21 JP JP2749783A patent/JPS58160991A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2643915A1 (en) * | 1976-09-29 | 1978-03-30 | Siemens Ag | PICTURE DISPLAY DEVICE |
| EP0031921A1 (en) * | 1979-12-28 | 1981-07-15 | Siemens Aktiengesellschaft | Gas discharge display device comprising at least one spacer frame limiting the post-acceleration space |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58160991A (en) | 1983-09-24 |
| DE3206451A1 (en) | 1983-09-08 |
| EP0087140A3 (en) | 1984-05-23 |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
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| PUAL | Search report despatched |
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| AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 19850124 |
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| REG | Reference to a national code |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GEFFCKEN, WALTER, DIPL.-ING. |