DE3206451A1 - METHOD FOR REDUCING THE UNDERGROUND BRIGHTNESS IN THE LOWER IMAGE AREA OF A GAS DISCHARGE DISPLAY DEVICE - Google Patents
METHOD FOR REDUCING THE UNDERGROUND BRIGHTNESS IN THE LOWER IMAGE AREA OF A GAS DISCHARGE DISPLAY DEVICEInfo
- Publication number
- DE3206451A1 DE3206451A1 DE19823206451 DE3206451A DE3206451A1 DE 3206451 A1 DE3206451 A1 DE 3206451A1 DE 19823206451 DE19823206451 DE 19823206451 DE 3206451 A DE3206451 A DE 3206451A DE 3206451 A1 DE3206451 A1 DE 3206451A1
- Authority
- DE
- Germany
- Prior art keywords
- image
- brightness
- cathode
- gas discharge
- display device
- 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- Withdrawn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 description 11
- 238000004904 shortening Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 8
- 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
- 230000002123 temporal effect Effects 0.000 description 1
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
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)
Description
SIEMENS AKTIENGESELLSCHAFT Unser ZeichenSIEMENS AKTIENGESELLSCHAFT Our mark
Berlin und München 82 P 1 1 1 8 DEBerlin and Munich 82 P 1 1 1 8 DE
Verfahren zur Reduzierung der Untergrund elllgke it imProcess for reducing the subsurface thickness in the unteren Bildbereich einer Gasentladungsanzeigevorrichtunglower image area of a gas discharge display device
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 indicator having a cathode, which consists of several cathode strips, which are isolated from one another, lie parallel to one another and can be controlled separately is known from DE-OS 26 43 915. The division of the cathode into individual isolated from each other Cathode strip is a further development of a flat cathode, as it is known from DE-OS 24 12 869 and is used for the display of 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 chamber, separated from each other by a perforated control disk with row and column lines are.
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 Durchlaßpotential),In the case of a flat screen, the cathode is divided into strips parallel to the anode rows. From these strips only one is connected as an active cathode at a time, in sequence from top to bottom «After switching off the bottom cathode should be the top cathode as soon as possible (for reasons of image brightness and Flickering) can be re-ignited. If the top lines of the screen are now switched to light (the Column lines are then at forward potential),
Rb 1 Gae / 16.02.1982Rb 1 Gae / 02/16/1982
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 °/o der aktiven Bildaufbauzeit liegen, um dieses Untergrundleuchten zu vermeiden. Dies würde zu einer entsprechenden Reduzierung der BiIdschirmhelligkeit führen.an underground glow occurs over the last cathode on if the pause until reignition of the first cathode is not chosen at least as long as the decay time the gas discharge lasts in the area of the last cathode. Depending on the type of gas, this is in the range of a few Milliseconds. This means that there would have to be a pause of 10 to 20% of the active image build-up time between the image runs to avoid this underground lighting. This would lead to a corresponding reduction in the brightness of the screen to lead.
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 reducing the brightness of the screen avoid. To solve this problem, it is proposed according to the invention in a method of the type mentioned at the outset that that the plasma is clocked backwards to the first cathode after the end of the image (lower image area).
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 in the plasma return phase not individually selected and the first anode parts activated during the return phase. Appropriately one anode row is activated in the corresponding cathode area.
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 development of the invention, the image brightness is reduced by shortening the dark phase between the Image cycles increased or the frame rate increased and thus the flicker at constant Image build time reduced by shortening the pause.
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,Based on a temporal course of the cathode currents shown in the figure of the drawing, the inventive Procedures are further explained. Assuming that the screen contains six cathodes,
zeigt die Figur den zeitlichen Verlauf T der Kathodenströme. Während der Bildaufbauzeit Tp werden die Kathoden der Reihe nach aktiviert. Die Auswahlzeit einer Kathode beträgt Tg1J ■ Tß/6· Bei Tß * 12 ms ist Tgg = 2 ms. Nach dem Abschalten der sechsten Kathode werden nun die Kathoden in umgekehrter Reihenfolge eingeschaltet. Die Auswahlzeit Tg» kann zweckmäßigerweise gleich der Zeilenauswahlzeit Τχ gewählt werden. Die Zeit Tp zwischen Bildende und Bildanfang beträgt dann 4 χ T^. Bei T^ = 30 >us ist Tp s 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 figure shows the time course T of the cathode currents. During the image build-up time T p , the cathodes are activated one after the other. The selection time of a cathode is Tg 1 J · Tß / 6 · With T ß * 12 ms, Tgg = 2 ms. After the sixth cathode has been switched off, the cathodes are switched on in the reverse order. The selection time Tg »can expediently be chosen equal to the line selection time Τχ. The time Tp between the end of the image and the beginning of the image is then 4 χ T ^. At T ^ = 30> us, Tp s is 120 / us. The gap between two images is then 1 % of the image build-up time. With helium as the filling gas, the gap without the plasma return is approx. 2.5 ms, ie approx. 20 %.
6 Patentansprüche
1 Figur6 claims
1 figure
Claims (6)
Priority Applications (3)
| 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 |
| EP83101569A 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 |
| JP2749783A JPS58160991A (en) | 1982-02-23 | 1983-02-21 | Lowering of background brightness for gas discharge type display unit |
Applications Claiming Priority (1)
| 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3206451A1 true DE3206451A1 (en) | 1983-09-08 |
Family
ID=6156467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19823206451 Withdrawn 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 |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0087140A3 (en) |
| JP (1) | JPS58160991A (en) |
| DE (1) | DE3206451A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0295690A2 (en) * | 1987-06-19 | 1988-12-21 | Kabushiki Kaisha Toshiba | Display area control system for plasma display apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2643915C2 (en) * | 1976-09-29 | 1983-10-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Display device |
| DE2952528C2 (en) * | 1979-12-28 | 1985-10-10 | Siemens AG, 1000 Berlin und 8000 München | Gas discharge indicator |
-
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
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0295690A2 (en) * | 1987-06-19 | 1988-12-21 | Kabushiki Kaisha Toshiba | Display area control system for plasma display apparatus |
| EP0295690A3 (en) * | 1987-06-19 | 1991-03-27 | Kabushiki Kaisha Toshiba | Display area control system for plasma display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0087140A2 (en) | 1983-08-31 |
| EP0087140A3 (en) | 1984-05-23 |
| JPS58160991A (en) | 1983-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8140 | Disposal/non-payment of the annual fee for main application |