[go: up one dir, main page]

EP0793212A1 - Steuerverfahren für eine Bildanzeigetafel mit Halbtönen und Anzeigeeinrichtung zur Durchführung dieses Verfahrens - Google Patents

Steuerverfahren für eine Bildanzeigetafel mit Halbtönen und Anzeigeeinrichtung zur Durchführung dieses Verfahrens Download PDF

Info

Publication number
EP0793212A1
EP0793212A1 EP97400389A EP97400389A EP0793212A1 EP 0793212 A1 EP0793212 A1 EP 0793212A1 EP 97400389 A EP97400389 A EP 97400389A EP 97400389 A EP97400389 A EP 97400389A EP 0793212 A1 EP0793212 A1 EP 0793212A1
Authority
EP
European Patent Office
Prior art keywords
sub
periods
cells
state
lines
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.)
Granted
Application number
EP97400389A
Other languages
English (en)
French (fr)
Other versions
EP0793212B1 (de
Inventor
Eric Thomson-CSF SCPI Benoit
Philippe Thomson-CSF SCPI Zorzan
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 SA
Vantiva SA
Original Assignee
Thomson Multimedia SA
Thomson CSF SA
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 Thomson Multimedia SA, Thomson CSF SA filed Critical Thomson Multimedia SA
Publication of EP0793212A1 publication Critical patent/EP0793212A1/de
Application granted granted Critical
Publication of EP0793212B1 publication Critical patent/EP0793212B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current
    • 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
    • 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
    • G09G3/297—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 opposed discharge type panels

Definitions

  • the present invention relates to a method for controlling image display screens displaying halftones. It applies to screens whose elementary image points are cells operating with two stable states and having a memory effect, and more particularly in the case where the half-tones of the image are obtained by a modulation of the duration of light emission.
  • the invention also relates to an image display device implementing the method.
  • memory effect is meant the effect which allows cells to maintain one or the other of two stable states, when a signal having commanded this state has disappeared.
  • Such display screens are constituted for example by plasma panels (abbreviated as "PAP"), of the direct current type with memory, or of the alternating type, or even for example by screens whose elementary cells use a phenomenon "peak effect" to each produce an electron beam.
  • PAP plasma panels
  • Such display screens are constituted for example by plasma panels (abbreviated as "PAP"), of the direct current type with memory, or of the alternating type, or even for example by screens whose elementary cells use a phenomenon "peak effect" to each produce an electron beam.
  • PAP plasma panels
  • These are flat screen display devices, which operate on the principle of an electric discharge in gases.
  • the PAP generally have two insulating tiles defining a space filled with gas.
  • the slabs support two or more networks of crossed electrodes.
  • Each intersection of electrodes defines a cell to which a small gas space corresponds.
  • electrical discharges can be caused in each of these spaces, by applying appropriate voltages to the two corresponding crossed electrodes.
  • the discharge current always takes place in the same direction, unlike the PAP type alternating whose operation is based on an excitation in alternating mode of the electrodes.
  • the electrodes are covered with a dielectric material, so that, not being in contact with the gas, electric charges accumulate on the dielectric with each discharge in the gas.
  • This memory effect is used by means of alternative signals called maintenance signals, applied to all cells to activate those which are in the "on” state, that is to say cause in these cells discharges say maintenance which produce the light, without modifying their "on” state or modifying the state of those which are in the "off” state.
  • Some alternative PAPs use only two crossed electrodes to define and control a cell, as described, for example, in the French patent published with No. 2,417,848.
  • the two crossed electrodes are used both for addressing (that is to say the setting to the "on” state or the setting to the "off” state of the cell), and the maintenance discharges.
  • PAPs of the "coplanar maintenance" type as known in particular from the European patent document EP-A-0 135 382.
  • each cell is defined at the intersection between a so-called “addressing" electrode "and a pair of parallel electrodes.
  • the maintenance discharges are carried out using the two parallel electrodes, and the addressing is carried out using one of these two electrodes and the addressing electrode.
  • the elementary cell of a PAP only knows two states: the "on” state or the "off” state. Since analog modulation of the amount of light emitted by a pixel, i.e. by a cell, is not possible, the production of halftones is accomplished by modulating the duration of light emission of the pixel in an image period, or in other words by modulating the time during which the cell is put in the "on" state within the image period.
  • Figure 1 shows schematically an alternative PAP. To simplify the description, the latter is of the type with two crossed electrodes to define a cell, as described in French patent 2,417,848 cited above.
  • the PAP comprises an array of electrodes Y1 to Y4 called “row electrodes”, crossed with a second array of electrodes called “column electrodes” X1 to X4. Each intersection of row and column electrodes corresponds to a cell C1 to C16. These cells are thus arranged in line L1 to L4 and in columns CL1 to CL4.
  • Each row electrode Y1 to Y4 is connected to an output circuit SY1 to SY4 of a line 1 control device, and each column electrode C1 to C4 is connected to an output circuit SX1 to SX4 of a column 2 control device .
  • Each output SY1 to SY4 of the line 1 control device delivers voltage slots which form the previously mentioned maintenance signals. These maintenance signals are thus applied simultaneously to all the line electrodes Y1 to Y4.
  • FIGS. 2a to 2d represent maintenance signals applied respectively to the line electrodes Y1 to Y4.
  • FIG. 2a shows in particular that the maintenance signals are formed of a succession of voltage slots, established on either side of a reference potential Vo which is often the ground potential. These slots vary between a negative potential V1 where they have a level, and a positive potential V2 where they have another level.
  • the reference potential Vo is applied to the column electrodes X1 to X4 in such a way that the application of the maintenance signals develops, between the cells C1 to C16, alternately positive and negative voltages, of 150 V for example, which generate discharges. in all PAP cells which are in the "on" state.
  • the cells are put into the “on” or “off” state by addressing operations which are managed by the image management device 3. They can consist, for example, of superimposing signals specific addressing on niche maintenance signals.
  • the line electrodes Y1 to Y4 are individualized, that is to say connected to an output circuit SY1 to SY4 specific to each of them, and each output circuit comprises for example a mixing circuit (not represented) by means of which it receives the maintenance signals and the addressing signals which come from different channels.
  • the maintenance signals have a period p which can be for example 10 microseconds, during which the addressing of all the cells belonging to a selected line L1 to L4 takes place, that is to say of all the cells defined using a selected line electrode Y1 to Y4.
  • the addressing may for example be of a type such that, at this time to, the signal applied to this electrode Y1 (and only to this one) is a negative erasure transition Tne, of duration (shown in broken lines) greater than the other transitions, and which causes the setting to "off" of all the cells connected to this line electrode Y1.
  • Tne negative erasure transition
  • a so-called inscription window C1 is superimposed (in positive) on this plateau.
  • This registration window is to put all cells connected to this row electrode in the "on” state, except those whose column electrodes X1 to X4 deliver a so-called “masking” signal (not shown) which effect of inhibiting the effects of the Cl registration window.
  • This operation can be repeated at each of the following periods of the maintenance signals at times t2 and t3, t4 and t5, t6 and t7 where the addresses of the lines L2, L3, L4 are thus produced respectively corresponding to the line electrodes Y2, Y3, Y4.
  • the first line L1 is addressed again.
  • FIG. 3 illustrates the division of the image period PI into n sub-periods S1, S2, ..., Sn with n equal to 4 in the example.
  • the image period PI begins at time to with a first sub-period S1 which lasts a time To, and ends at a time Ta.
  • a second sub-period S2 begins at time ta and lasts a time equal to 2 TB to end at time tb, where a third sub-period S3 begins.
  • the third sub-period S3 lasts a time equal to 4 TB and ends at an instant tc.
  • a fourth sub-period S4 begins at time tc and lasts a time equal to 8 TB, until the end of the period PI which marks the instant to 'of a following image period.
  • the sub-periods S1, S2, S3, S4 respectively have a duration of the order of 1.33 ms; 2.66 ms; 5.33 ms and 10.66 ms.
  • each line L1 to L4 can be addressed four times during the image period of this line, at the instants to, ta, tb and tc. It is therefore possible for each line L1 to L4 to put each cell C1 to C16, in the "off” state or in the "on” state at each of these instants, that is to say at each start of sub- periods S1 to Sn, and each cell retains this state until the start of the next sub-period where it is again put into one or the other of the two states "off", "on”.
  • the cells which are put in the "lit” state by the beginning of one or more sub-periods S1 to Sn they are activated by the maintenance signals and they produce light during the duration of this or these sub-periods. It is therefore possible by combination of the n sub-periods S1 to Sn to obtain 2 n -1 different durations of light emission by each cell, durations which each correspond to a desired luminance level for this cell during the image period PI, plus the zero luminance level which corresponds to the case of a cell which is put in the "off” state for all the sub-periods S1 to Sn of this image period.
  • This principle of controlling the luminance levels of the cells of a line L1 to L4 applies to all the lines, of course with a time shift from one line to another; for example from a line L1 to the next line L2 with an offset which corresponds to a period p of the maintenance signal as shown in FIG. 2, and which can for example be of the order of 10 microseconds.
  • the image period PI has the same duration for all the lines L1 to L4, whatever the number N of these lines, with a time offset for example of a period between two consecutive lines, an offset which is found in the distribution of sub-periods S1 to Sn.
  • the desired luminance levels for the different cells of each line L1 to L4 correspond to video input luminances which are coded and stored in the image management device 3, generally using n bits of different weights each corresponding to one of the sub-periods S1 to Sn.
  • the cells C1 to C16 in the "on" state being activated by the maintenance signals delivered by the line 1 control device, they constitute a load applied to the latter.
  • the maintenance signals can be produced in various ways, which are known per se.
  • the line control device comprises for this purpose at least one amplifier A which delivers the maintenance signals to the output circuits SY1 to SY4, either directly as shown in FIG. 1, or through several output stages (not shown) each assigned to supply several output circuits, that is to say several line electrodes Y1 to Y4.
  • the maintenance signals supplied by amplifier A must be supplied by amplifier A under a current which can vary considerably depending on the content of the image, i.e. depending on the number of cells which are in the "on” state.
  • the amount of charges applied actually at a given cell C1 to C16 depends on the overall content of the image. In other words, the higher the charge applied to amplifier A, the more the luminance of the cells in the "on" state which constitute this charge is reduced.
  • FIG. 4 represents an image formed mainly of a peripheral zone Z1 with low luminance, and of a second zone Z2 at high luminance and having a constant video coding.
  • FIG. 4 represents an image formed mainly of a peripheral zone Z1 with low luminance, and of a second zone Z2 at high luminance and having a constant video coding.
  • the second area Z2 is made of two surfaces contiguous R1, R2, the second R2 of which is located in the center of the first R1, and which one wishes to display on these two surfaces different but similar luminances: for example a luminance I2 corresponding to a video coding equal to 128 (in the case of video coding on 8 bits (i.e. with 8 sub-periods as previously explained) for the second surface R2, and a luminance I1 coded 127 for the first surface R1.
  • a known solution consists in reducing the source impedances and the connection impedances, and the impedances presented by the electrodes themselves. This is obtained by a choice and a selection of the components, by a particularly careful drawing and realization of the paths of the discharging currents as well as by multiplying the paths offered to the discharging currents (in particular by putting in parallel several power transistors , at the level of the maintenance signal amplifier (s) (such as amplifier A) as well as in the output circuits (such as circuits SY1 to SY4).
  • the maintenance signal amplifier such as amplifier A
  • the object of the present invention is to limit the variations in luminance as a function of the content of the image, and to reduce or even eliminate highlighting defects.
  • the invention proposes to act on the load in a relatively simple and inexpensive manner.
  • the invention relates to a method for controlling a display screen whose elementary image points are cells. arranged in rows and columns, the cells being placed either in a state called “off", or in a state called “on” in which they are activated by signals delivered by a control device, the cells in the state “on” producing light and constituting a load applied to the control device, the method consisting for each line, as a function of a desired level of luminance for each cell, putting each cell in the "off” state or in the "on” state during n successive sub-periods of different durations distributed during a given cycle time, the method being characterized in that it further consists in acting on the order of distribution of the sub-periods, so to reduce variations in the load applied to the control device.
  • the invention also relates to an image display device comprising cells arranged in rows and in columns, the cells being placed either in a so-called “off” state, or in a so-called “on” state in which they are activated by signals delivered by a control device, the cells in the "on” state constituting a load applied to the control device, the cells being put in the "on” state or in the "off” state during sub-periods of different durations applied to each line, the sub-periods being distributed successively under the control of an image management device, characterized in that the image management device comprises means for distributing the sub-periods to at minus two consecutive rows of cells with different distribution orders for each row.
  • FIGS. 5a, 5b For two lines of close or consecutive cells such as for example the second and the third line L2, L3 (already shown in FIG. 1), which both would pass in the peripheral zone Z1 and in the surfaces R1 and R2 (fig. 4) , a charge Q constituted by the cells in the "lit" state, for each of these two lines L2, L3 is shown in FIGS. 5a, 5b.
  • FIG. 5a illustrates the variations of the charge Q for the second line L2 over time and for the image configuration of FIG. 4, and FIG. 5b illustrates these variations for the third line L3.
  • the charge Q and its variations are the same, that the description which is given below therefore applies to the two lines, and that the time marks are valid for these two lines.
  • there is a time difference between these two lines which corresponds to the time interval required to address two consecutive lines, as already explained in connection with FIG. 2.
  • This time interval which is for example of the order of 10 microseconds is therefore very small and not very significant compared to that of a PI image period of 20 ms which is used to show the evolution of the charge Q of the lines L2, L3.
  • the number of cells in the "on" state is constant for the seven sub-periods S1 to S7 which follow one another at times t1, t2, t3, t4, t5, t6, and the charge Q therefore has a value Q1 constant up to 'at the end of the seventh sub-period S7 at an instant t7.
  • the sum (in duration) of the sub-periods S1 to S7 defines the luminance level 127.
  • the charge Q shows a strong increase and passes from the first value Q1 to a second value Q2, at time t7 when the eighth sub-period S8 begins.
  • the latter having a duration equal to 1/2 image period, it ends at a time tFP which marks the end of the image period Pl.
  • the method of the invention consists in distributing the n sub-periods S1 to Sn in a different order for the two lines of cells considered, and therefore in distributing the activation times differently for these two lines. cells within the image period Pl.
  • the sequencing of the sub-periods S1 to S8 can be such that for the third line L3 it begins with the eighth sub-period S8 , as shown in Figure 5c.
  • FIG. 5c represents the variations of the charge Q of the third line L3, during an image period Pl.
  • the eighth sub-period S8 begins, which substantially ends at time t7.
  • the load has the second value Q2.
  • the charge formed by the second line L2 has the first lower value Q1, generated by the activation of the cells by the seven sub-periods S1 to S7).
  • the eighth sub-period S8 ends, and the succession of the seven sub-periods S1 to S7 begins.
  • the charge constituted by the third line L3 passes from the high value Q2 to the first value Q1 which is lower (unlike what happens at this time for the second line L2, whose charge then goes from the first value Q1 to the second value Q2 which is higher).
  • the seventh sub-period S7 ends (for the third line L3) at the end of the image period PI, at the instant tFP where a new image period begins.
  • this distribution sequence according to the invention must start with the seventh sub-period S7, it can be followed by the eighth sub-period S8 then by the sub-periods S1 to S6.
  • the advantageous effect of compensating for variations in the load of two consecutive lines can also be obtained with a sequencing of the partially inverted type for the two consecutive lines, as soon as it is different, between these two lines, for example organized by an inversion from 64 (S7) for one and from 128 (S8) for the other.
  • the means useful for implementing the method of the invention already exist essentially, in most image management devices 3 such as that shown in FIG. 1, which are used to control a display screen.
  • FIG. 6 schematically shows, by functional blocks, some of the functions in themselves known which are provided by an image management device 3 of the plasma panel.
  • It comprises for example a video input circuit 10 which performs an adaptation of the video signals, and classifies them for example for each row of cells, as a function of the luminance to be displayed by each cell.
  • the video input circuit 10 delivers video data which is applied to a video coding circuit 11.
  • the latter can for example include a coding table TC, with the help of which it defines the different sub-periods S1 to Sn during which each cell of a given line must be activated during a PI image period, to restore the desired luminance level.
  • the video coding circuit 11 delivers coded data to a memory circuit 12, which can for example include as many memory planes PM1, PM2, ... PMn as there are sub-periods S1 to Sn.
  • a memory circuit 12 can for example include as many memory planes PM1, PM2, ... PMn as there are sub-periods S1 to Sn.
  • Each sub-period S1 to Sn can thus correspond to a memory plane in which, for each line L1, L4, the addresses of cells C1 to 16 are stored, which must be set to the "on" state.
  • the memory circuit 12 by exchange of information with the row and column control devices 1, 2 (shown in FIG. 1), determines the execution of the "on” or “off” state of the various cells of each line, at the start of each of the sub-periods S1 to Sn which are distributed for each line within an image period PI.
  • the memory circuit 12 can for this purpose comprise a sequencer circuit 13, connected to each of the memory planes PM1 to PMn, and which for each line can then determine the order of distribution of the sub-periods S1 to Sn, so that for a given line, this distribution operates according for example to a simple sequencing such as the conventional mode shown in FIG. 5a, and that for the following line it operates according to the so-called sequencing mode reversed, shown in Figure 5c.
  • This can be achieved in a simple manner, for example by programming the sequencer 13, so as to alternate a simple sequencing and a reverse sequencing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
EP97400389A 1996-02-27 1997-02-21 Steuerverfahren für eine Bildanzeigetafel mit Halbtönen und Anzeigeeinrichtung zur Durchführung dieses Verfahrens Expired - Lifetime EP0793212B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9602393A FR2745410B1 (fr) 1996-02-27 1996-02-27 Procede de commande d'un ecran de visualisation d'image affichant des demi-teintes, et dispositif de visualisation mettant en oeuvre le procede
FR9602393 1996-02-27

Publications (2)

Publication Number Publication Date
EP0793212A1 true EP0793212A1 (de) 1997-09-03
EP0793212B1 EP0793212B1 (de) 2000-03-15

Family

ID=9489603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400389A Expired - Lifetime EP0793212B1 (de) 1996-02-27 1997-02-21 Steuerverfahren für eine Bildanzeigetafel mit Halbtönen und Anzeigeeinrichtung zur Durchführung dieses Verfahrens

Country Status (7)

Country Link
US (1) US6067060A (de)
EP (1) EP0793212B1 (de)
JP (1) JPH09237061A (de)
KR (1) KR970064172A (de)
CN (1) CN1110941C (de)
DE (1) DE69701413T2 (de)
FR (1) FR2745410B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002508090A (ja) * 1998-03-23 2002-03-12 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ ディスプレイ駆動
JP4700366B2 (ja) * 2005-02-14 2011-06-15 三洋電機株式会社 オンスクリーン表示回路
EP1768087A1 (de) * 2005-09-22 2007-03-28 Deutsche Thomson-Brandt Gmbh Verfahren und Vorrichtung zur rekursiven Kodierung von Luminanzwerten in Teilfeldkodewörter bei einer Anzeigevorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306011A2 (de) * 1987-08-31 1989-03-08 Sharp Kabushiki Kaisha Verfahren zum Steuern eines Anzeigegerätes
WO1994009473A1 (en) * 1992-10-15 1994-04-28 Rank Brimar Limited Display device
WO1995027971A1 (en) * 1994-04-11 1995-10-19 The Secretary Of State For Defence Ferroelectric liquid crystal displays with greyscale

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417848A1 (fr) * 1978-02-21 1979-09-14 Thomson Csf Methode d'effacement d'un panneau a plasma et systemes de visualisation par panneau a plasma utilisant cette methode
FR2605444A1 (fr) * 1986-10-17 1988-04-22 Thomson Csf Procede de commande d'un ecran matriciel electrooptique et circuit de commande mettant en oeuvre ce procede
US5233340A (en) * 1989-09-16 1993-08-03 Sharp Kabushiki Kaisha Method of driving a display device
US5302966A (en) * 1992-06-02 1994-04-12 David Sarnoff Research Center, Inc. Active matrix electroluminescent display and method of operation
US5751264A (en) * 1995-06-27 1998-05-12 Philips Electronics North America Corporation Distributed duty-cycle operation of digital light-modulators
JP3568644B2 (ja) * 1995-09-01 2004-09-22 シャープ株式会社 液晶表示装置およびその駆動方法
US5729243A (en) * 1995-12-21 1998-03-17 Philips Electronics North-America Corporation Multi-frame-rate operation of digital light-modulators

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306011A2 (de) * 1987-08-31 1989-03-08 Sharp Kabushiki Kaisha Verfahren zum Steuern eines Anzeigegerätes
WO1994009473A1 (en) * 1992-10-15 1994-04-28 Rank Brimar Limited Display device
WO1995027971A1 (en) * 1994-04-11 1995-10-19 The Secretary Of State For Defence Ferroelectric liquid crystal displays with greyscale

Also Published As

Publication number Publication date
KR970064172A (ko) 1997-09-12
DE69701413T2 (de) 2000-09-07
US6067060A (en) 2000-05-23
FR2745410A1 (fr) 1997-08-29
EP0793212B1 (de) 2000-03-15
FR2745410B1 (fr) 1998-06-05
JPH09237061A (ja) 1997-09-09
CN1180274A (zh) 1998-04-29
CN1110941C (zh) 2003-06-04
DE69701413D1 (de) 2000-04-20

Similar Documents

Publication Publication Date Title
EP0635819B1 (de) Verfahren und Einrichtung zur Steuerung einer Mikrospitzenanzeigevorrichtung
FR2816095A1 (fr) Procede de pilotage et circuit de pilotage d'un panneau d'affichage plasma
FR2635902A1 (fr) Procede de commande tres rapide par adressage semi-selectif et adressage selectif d'un panneau a plasma alternatif a entretien coplanaire
FR2738654A1 (fr) Procede de pilotage pour un affichage plasma permettant un affichage d'echelle de gris ameliore et affichage plasma correspondant
FR2738379A1 (fr) Procede de pilotage d'affichage par echelle de gris d'un dispositif d'affichage a cristaux liquides
FR2794563A1 (fr) Procede d'adressage de panneau d'affichage au plasma
FR2772502A1 (fr) Procede de compensation des differences de remanence des luminophores dans un ecran de visualisation d'images
EP3079142B1 (de) Bildanzeigeverfahren auf matrix-bildschirm
FR2762704A1 (fr) Procede d'adressage pour ecran a plasma base sur une repetition de bits sur une ou plusieurs lignes
FR2822284A1 (fr) Procede d'affichage d'images video sur panneau d'affichage a plasma et panneaux d'affichage a plasma correspondant
FR2811127A1 (fr) Dispositif d'affichage a plasma et procede de pilotage de celui-ci
EP1958182B1 (de) Videosystem mit einer durch ein verbessertes adressierungsverfahren gesteuerten flussigkristallmatrixanzeige
FR2829275A1 (fr) Procede d'affichage d'images video sur un dispositif d'affichage et panneau d'affichage a plasma correspondant
EP0774746A1 (de) Steuerverfahren für eine Anzeigetafel und Anzeigetafel zur Durchführung dieses Verfahrens
EP0641475B1 (de) Darstellungsverfahren von verschiedenen grauwerten und system zur durchführung dieses verfahrens.
EP0793212B1 (de) Steuerverfahren für eine Bildanzeigetafel mit Halbtönen und Anzeigeeinrichtung zur Durchführung dieses Verfahrens
EP0907945B1 (de) Verfahren zum aktivieren von bildschirmzellen und anzeigegerät zur durchführung dieses verfahrens
FR2762703A1 (fr) Procede et dispositif d'adressage a code tournant pour ecrans a plasma
EP0951711B1 (de) Verfahren zur adressierungsansteurung einer wechselstromplasmaanzeigetafel
FR2776414A1 (fr) Procede et dispositif pour adressage de panneaux a plasma
EP0793213A1 (de) Ansteuerungsverfahren für einen Anzeigebildschirm nach dem Prinzip der Modulation der Lichtemissionszeit und Anzeigevorrichtung, die dieses Verfahren verwendet
EP1771838B1 (de) Bildanzeigevorrichtung und steuerungsverfahren für die anzeigevorrichtung
EP1131810B1 (de) Adressierverfahren und plasmaanzeige basierend auf separaten gerade und ungerade numerierten linienadressen
WO2007065908A1 (fr) Afficheur matriciel sequentiel couleur a cristaux liquides
FR2769115A1 (fr) Procede de commande d'un panneau de visualisation alternatif integrant une ionisation

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19970909

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON MULTIMEDIA

Owner name: THOMSON-CSF

17Q First examination report despatched

Effective date: 19980508

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON MULTIMEDIA

Owner name: THOMSON-CSF

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69701413

Country of ref document: DE

Date of ref document: 20000420

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20000517

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030124

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030217

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030320

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040901

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041029

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050221