EP0457637A1 - Verfahren zur Luminanzsteuerung einer wechselspannungsbetriebenen Plasmaanzeigetafel - Google Patents

Verfahren zur Luminanzsteuerung einer wechselspannungsbetriebenen Plasmaanzeigetafel Download PDF

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Publication number
EP0457637A1
EP0457637A1 EP91401145A EP91401145A EP0457637A1 EP 0457637 A1 EP0457637 A1 EP 0457637A1 EP 91401145 A EP91401145 A EP 91401145A EP 91401145 A EP91401145 A EP 91401145A EP 0457637 A1 EP0457637 A1 EP 0457637A1
Authority
EP
European Patent Office
Prior art keywords
maintenance
electrodes
cells
signals
line
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Withdrawn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
EP91401145A
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English (en)
French (fr)
Inventor
Michel Gay
Jacques Deschamps
Serge Salavin
Michel Specty
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.)
Thales Electron Devices SA
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Thomson Tubes Electroniques
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Filing date
Publication date
Application filed by Thomson Tubes Electroniques filed Critical Thomson Tubes Electroniques
Publication of EP0457637A1 publication Critical patent/EP0457637A1/de
Withdrawn legal-status Critical Current

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    • 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
    • G09G3/288—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 AC panels
    • G09G3/291—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 AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—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 AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G3/288—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 AC panels
    • G09G3/298—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 AC panels using surface discharge panels

Definitions

  • the invention relates to a method for adjusting the luminance of a screen of the alternating plasma panel type, making it possible in particular to act by lines or by bands in order to create localized highlights or sub-glosses of the screen.
  • Plasma panels of the alternative type called in the following description "PaP.Ac" have a memory property which makes it possible to dissociate the addressing functions (command to write or erase information), maintenance of light discharges which is used to produce most of the useful light.
  • a conventional method of adjusting the overall luminance of the screen consists in adjusting the frequency of maintenance signals which carry out the maintenance of the discharges, maintenance by which cells in the "registered" state produce light.
  • the operation and structure of "PaP.Ac" are in themselves well known.
  • the panels are for example of the type with two crossed electrodes to define a discharge cell, as described for example in a French patent in the name of THOMSON-CSF published with the number 2.417.848; addressing discharges and maintenance discharges being carried out between two same electrodes.
  • These panels can also be of the coplanar maintenance type, with for example three electrodes crossed to define a cell, so that addressing discharges and maintenance discharges can take place between different electrodes, as described in particular in a European patent application EP-A-0135 382 and in a French patent application published with the number 2 629 265.
  • a classic addressing method consists in operating line by line: in this case all the cells of a line are controlled to be put all in the same state, the "erased" state for example (semi-selective operation) and this operation is followed by a selective operation during which one or more selected cells of this same line are "registered".
  • the semi-selective and selective operations are carried out for each line during an addressing phase, with a time offset from one line to the next line which corresponds to the duration of a line cycle.
  • each line cycle generally the addressing phase is followed by a specific maintenance phase, so that, for each cell line, between two consecutive addressing phases, the cells in the "registered" state are activated by the service signals.
  • these panels generally comprise an array of electrodes called column electrodes, whose function is only an addressing function and which are crossed with pairs of maintenance electrodes; each pair being formed an address-maintenance type electrode having an addressing function plus a maintenance function, and an electrode having only a maintenance function.
  • Each crossing of a column electrode with a pair of electrodes defines a cell, such that the cells are arranged in rows and columns; each row of cells corresponds to a pair of maintenance electrodes.
  • Selective addressing is carried out between a column electrode and a addressing-maintenance electrode; semi-selective addressing (an entire line) can be carried out between the two electrodes of the same pair. Maintenance discharges are obtained by applying maintenance signals to two electrodes of the same pair.
  • voltage slots are permanently applied to all cell lines, slots which form maintenance signals during the maintenance phases, and which constitute basic slots during the addressing phases; Address slots (registering or deleting) are superimposed on these basic slots only on the address-maintenance electrode of the addressed line.
  • the basic slots have substantially the same amplitude as the slots for maintenance signals, so that they can generate at least one light discharge.
  • maintenance addressing electrodes are individualized, whereas on the contrary the maintenance only electrodes simultaneously receive identical slots and are generally connected together.
  • the method of the invention is simple to implement and it applies as well to the adjustments of the luminance in the intermediate cases mentioned above as to adjust the overall luminance.
  • the process of the invention also finds a particularly interesting application in polychrome "PaP. Ac", for color balancing.
  • a method for controlling an alternative plasma panel said panel comprising a plurality of cells arranged in rows and columns, the method consisting in controlling the "written" or “deleted” state of the cells and applying maintenance signals to the cells so as to activate the cells in the "registered” state, is characterized in that it consists in inhibiting the transmission of one or more maintenance signals to the cells of at least one line so as to reduce the luminance of this line.
  • FIG. 1 shows an alternative plasma panel 1 to which a preferred mode of the method of the invention can be applied.
  • the panel 1 is of the coplanar maintenance type. It comprises a network of column electrodes X1 to X4 which are crossed in a conventional manner with pairs of maintenance electrodes P1 to P9 arranged in rows. Each pair P1 to P9 of electrodes comprises an address-maintenance electrode Y1 to Y9 and a maintenance-only electrode E1 to E9: the address-maintenance electrodes Y1 to Y9 fulfill an addressing function on the one hand in cooperation with the column electrodes X1 to X4 and, on the other hand, a maintenance function with the maintenance-only electrodes. Consequently, these address-maintenance electrodes Y1 to Y9 must be individualized and they are each connected to a separate output of a line 3 address register, which delivers SAE signals useful for addressing and maintenance. .
  • the maintenance only electrodes E1 to E9 only provide a maintenance function, they can therefore all be connected to the same output of a pulse generator 4, from which they receive maintenance signals SE.
  • the column electrodes X1 to X4 provide an addressing function, they are therefore individualized and each connected to a separate output of a column addressing register 5 delivering addressing signals SA.
  • the operating commands and the synchronization of the two address registers 3, 5 and of the generator 4 are managed in the traditional way by a control device 12.
  • Each crossing of a column electrode X1 to X4 with a pair P1 to P9 of electrodes defines a cell C1 to C36, the cells thus being arranged in rows L1 to L9 and in columns.
  • a characteristic of the method consists in eliminating, that is to say in not applying, to at least one line L1 to L9 of cells, the maintenance signals SE delivered by the pulse generator 4; this being obtained by not applying these maintenance signals to the corresponding maintenance-only electrode E1 to E9.
  • the second, third, seventh and eighth maintenance-only electrodes E2, E3, E7 and E8 are not supplied with maintenance signals, maintenance discharges do not occur for the cells formed by the pairs P2, P3, P7, P8 i.e. the lines L2, L3, L7, L8.
  • the cells of these lines produce less light and constitute areas of under-brightness on the screen, compared to the lines of cells L1, L4, L5, L9 which are normally supplied.
  • the maintenance signals SE are not suppressed but their transmission to the cells is inhibited.
  • the passage from one luminance level to the other can be done globally for the whole screen, it suffices to cut the general transmission of the maintenance signal SE or to establish it using the switch I1 for example.
  • the luminance modifications can also be carried out in packets of one or more contiguous lines as already explained above, for lines whose positions are predetermined or not.
  • these lines can be separated from the others, and for example connect them by the same packets to the generator 4 by means, for example, of a second switch I2 for each packet, as shown in FIG. 1 with the maintenance lines E3, E4 only.
  • Another method consists in implanting only maintenance electrodes for the lines L1 to L9 which are desired to be brighter. For example, if it is expected that the second and third lines L2, L3 will be brighter, only the second and third maintenance-only electrodes E2, E3 are implanted and not the others.
  • Another interesting possibility offered by the method of the invention applies to the adjustment of the colors of a polychrome panel.
  • each color can be given two levels of intensity.
  • the cells of lines L1, L4, L7 can correspond to the blue color B; the cells of lines L2, L5, L8 in the color red and the cells of lines L3, L6 and L9V in the color green. If these three groups of lines are connected to generator 4 each via a switch (not shown), two intensity levels can be obtained for each color.
  • the maintenance signals SE delivered by the generator 4 has the effect of reducing the potential difference generated between the two electrodes of the pairs P1 to corresponding P9, that is to say to reduce the amplitude of the rising or falling edges previously mentioned, to the point that no discharge occurs between these two electrodes.
  • the above-mentioned effect is obtained by acting on at least one of the address-maintenance electrodes Y1 to YE9 by not transmitting to this electrode a part SAE signals useful for maintenance.
  • FIGS. 2a, 2b and 2c to be read at the same time illustrate by way of nonlimiting example the maintenance signals applied to the pairs P1 to P9:
  • FIG. 2a represents the signals SAE applied to the address-maintenance electrodes Y1 to Y9;
  • FIG. 2b represents the signals SE applied to the maintenance only electrodes E1 to 9 and
  • FIG. 2c illustrates the differences in potential SAE-SE generated between the two electrodes of the same pair P1 to P9 by the application of these signals or of one of these signals.
  • the signal SE reverses and passes from the negative voltage -V2 to a positive voltage + V2, which generates a new negative variation of the difference SAE- SE which passes to a negative value - V3, variation which is added to that already produced at time t1 and which generates a discharge of maintenance (not illustrated).
  • the signal SAE goes from -V1 to + V1 and causes a new positive variation of the difference SAE-SE which goes to + V3, from which results a new maintenance discharge.
  • this voltage square wave of the signal SE is not transmitted to one or more maintenance electrodes E1 to E9, the maintenance discharges of the instants t3 ′ and t4 are eliminated for the pairs P1 to P9 corresponding. Indeed, because at each of these instants t3 ′ and t4 there is only one edge coming from the SAE signal, the maintenance is "truncated" and if the voltages are correctly adjusted, the light discharge is not not produce.
  • FIGS. 3a to 3e illustrate by way of nonlimiting example a case where the maintenance, for three pairs of electrodes P1, P2, P3 for example, is carried out differently for each pair by playing on the signals SE applied to the electrodes only for maintenance E1, E2, E3.
  • FIG. 3a represents addressing signals SA applied to the column electrodes X1 to X9;
  • FIG. 3b represents the SAE signals applied simultaneously and in the same way to all the address-maintenance electrodes Y1 to Y9;
  • FIGS. 3c, 3d, 3e respectively represent signals SE1, SE2, SE3 applied to the first, second and third electrodes only for maintenance E1, E2, E3.
  • the maintenance signals SE2 transmitted to the second electrode only for maintenance E2 are at the maximum number, and consequently, the luminance of the second line L2 is maximum, for example Lmax equal 100 cd / m2.
  • the maintenance signals SE3 transmitted to the third electrode only for maintenance E3 are in an intermediate number, 2 of 5 for example: in this case the luminance of the third line L3 is equal to the minimum luminance Lmin + 2/5 of Lmax-Lmin, i.e. 58 cd / m2.
  • the invention can also be applied to non-coplanar panels, that is to say to panels comprising only two electrodes crossed to form a cell.
  • a plasma panel could be represented by FIG. 1 by removing all the maintenance-only electrodes.
  • the line electrodes would be grouped for example into two packets, one of which would receive the maximum number of maintenance signals and the other of which would receive 2 signals out of 5, the lines with higher luminance would for example have 30 cd / m2 and the lines with lower luminance would have about 12 cd / m2.
  • the addressing cycles represent in practice a significant part of frame time, for example, for a screen of 480 lines refreshed every 20 ms, the addressing occupies approximately 480 x 20 ⁇ s / line, or 9.6 ms which represent 48% of the total time.
  • This constraint can be circumvented by inserting maintenance cycles of reduced duration between the addressing phases.
  • FIGS 4a, 4b, 4c illustrate such an organization, which can be applied particularly, but not exclusively, in the case of alternative plasma panels with two crossed electrodes per cell.
  • FIG. 4a represents SX addressing signals applied to the column electrodes.
  • FIG. 4b represents addressing signals and maintenance signals applied to a line electrode, corresponding to a line Li for which the maximum luminance is desired.
  • FIG. 4c shows addressing and maintenance signals applied to the line electrode of a following line Li + 1 for which a reduced luminance is desired.
  • each addressing phase comprises a basic erasure slot CBe within an erasure cycle CE, followed by an enrollment cycle CI comprising a basic slot CBi registration.
  • the addressing phases PA1, PA2 have a duration of the order of 20 ⁇ s and in the case for example of a panel of 480 lines, the time available for the PE maintenance phases is 21.6 ⁇ s; this authorizes a maximum of 4 consecutive maintenance cycles CS1 to CS4 each having a shorter duration than an erasure or CE registration cycle, C1, which allows 5 levels of luminance.
  • the first addressing phase PA1 is used for addressing this line, and consequently and in a conventional manner, on the one hand, an erasure pulse IE is superimposed on the erasure slot Cbe and, on the other hand, a registration pulse Ii is superimposed on the basic inscription slot CBi.
  • the first addressing phase PA1 is followed, for the line Li, by the 4 maintenance cycles CS1 to CS4. Then the maintenance phase PE1 is followed by a second addressing phase PA2, and so on.
  • the line Li + 1 also sees the addressing phase PA1, followed by a maintenance phase PE1, itself followed by a second addressing phase PA2, etc ...; the addressing of the line Li + 1 being carried out during the second addressing phase PA2.
  • the number of maintenance cycles CS1 to CS4 transmitted is less than that which is transmitted for the line Li.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (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)
  • Control Of Gas Discharge Display Tubes (AREA)
EP91401145A 1990-05-15 1991-04-30 Verfahren zur Luminanzsteuerung einer wechselspannungsbetriebenen Plasmaanzeigetafel Withdrawn EP0457637A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9006032A FR2662291A1 (fr) 1990-05-15 1990-05-15 Procede de reglage de la luminance d'un panneau a plasma alternatif.
FR9006032 1990-05-15

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EP0457637A1 true EP0457637A1 (de) 1991-11-21

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EP91401145A Withdrawn EP0457637A1 (de) 1990-05-15 1991-04-30 Verfahren zur Luminanzsteuerung einer wechselspannungsbetriebenen Plasmaanzeigetafel

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EP (1) EP0457637A1 (de)
JP (1) JPH04229896A (de)
FR (1) FR2662291A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774746A1 (de) * 1995-11-17 1997-05-21 Thomson Tubes Electroniques Steuerverfahren für eine Anzeigetafel und Anzeigetafel zur Durchführung dieses Verfahrens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3028087B2 (ja) 1997-07-08 2000-04-04 日本電気株式会社 プラズマディスプレイパネルの駆動方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284480A1 (de) * 1987-03-13 1988-09-28 Thomson-Csf Verfahren zur Farbensteuerung einer polychromen Plasmaanzeigevorrichtung und dieses Verfahren verwendende Plasmaanzeigevorrichtung
FR2635902A1 (fr) * 1988-08-26 1990-03-02 Thomson Csf Procede de commande tres rapide par adressage semi-selectif et adressage selectif d'un panneau a plasma alternatif a entretien coplanaire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284480A1 (de) * 1987-03-13 1988-09-28 Thomson-Csf Verfahren zur Farbensteuerung einer polychromen Plasmaanzeigevorrichtung und dieses Verfahren verwendende Plasmaanzeigevorrichtung
FR2635902A1 (fr) * 1988-08-26 1990-03-02 Thomson Csf Procede de commande tres rapide par adressage semi-selectif et adressage selectif d'un panneau a plasma alternatif a entretien coplanaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 27, no. 10B, mars 1985, pages 6105-6106, New York, US; "AC Plasma brightness control scheme" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774746A1 (de) * 1995-11-17 1997-05-21 Thomson Tubes Electroniques Steuerverfahren für eine Anzeigetafel und Anzeigetafel zur Durchführung dieses Verfahrens
FR2741468A1 (fr) * 1995-11-17 1997-05-23 Thomson Tubes Electroniques Procede de commande d'un ecran de visualisation et dispositif de visualisation mettant en oeuvre ce procede
US5867135A (en) * 1995-11-17 1999-02-02 Thomson Tubes Electroniques Method for the control of a display screen and display device implementing this method

Also Published As

Publication number Publication date
JPH04229896A (ja) 1992-08-19
FR2662291A1 (fr) 1991-11-22

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