DE2720261A1 - ARRANGEMENT FOR CONTROLLING A FLAT SCREEN DISPLAY DEVICE AND METHOD OF OPERATING THE ARRANGEMENT - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT Our mark

Berlin and Munich 77 P 7 5 2 1 FRG

Arrangement for controlling a flat panel display device and experience for operating the arrangement

The invention relates to an arrangement for controlling a flat panel display device with a vacuum system which contains a thermal cathode as an electron source and a hole matrix for row and column control as well as electrodes connected in groups.

In a known image display device, a thermal cathode, a matrix of holes with an electrode arrangement for the Row and column controls as well as the screen in a vacuum chamber arranged. This display device contains, for example, the control of 512 512 pixels with binary signals controllable electrodes, which are arranged in 18 planes parallel to one another and one behind the other. The electrodes of the individual levels are separated from each other by insulating plates

I ^ separates the one assigned to each pixel for the electron flow Holes included. The electrodes are designed as conductive strips attached to the perforated plate and also with the Provided holes assigned to pixels. The electrodes of the individual levels are summarized in groups and labeled as one all control lines. Of the 18 electrode levels, 9 are provided for row control and 9 for column control. Due to the large number of electrode levels and the insulating layers arranged between them, there is a relatively large amount thick control arrangement. It thus arises for those released from the cathode and accelerated towards the anode

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809845/0408

Electrons J anger ¥ fi <- ir d ^ n channels from each other him depends holes arranged> ier matrices are formed and are associated with the einzflr.ien Bil.dpunkteii (IEE Transact, on Electron Devices, Vol ED ~.? O. No. ν., Nov. 75, pages 1052-1061).

It is now an object of the invention to reduce the control arrangement of this known vacuum image display device to make the number of electrode levels flatter and) the row and column control by special grouping of the electrodes of the pixels with digital control pulses according to various logical code systems.

To solve this problem, the a> According to the invention, at least two separately controllable at least for the holes of the individual cells .jf? ve »Jl <j Electrodes are provided and arranged in separate planes parallel to the flat sides of at least one hole matrix. From the electrodes on the same level are at least three adjacent) grouped together in row groups and from these electrodes In each case one electrode of the various row groups forms an electrode group. In the second level all form electrodes the same group of rows an electrode group. The largest controllable number of lines is therefore the product of the number of »Electrode groups of the first and second level.

In a special embodiment of the control arrangement, in which even more rows can be controlled with the same number of electrode groups per level, electrodes from further row groups are connected cyclically at a predetermined distance to the corresponding control line of this level and with a third level, in the now all each a group cycle of the previous level associated with adjacent electrodes are jointly controllable, complemented, the number of jointly controllable groups of electrodes of different levels is then preferably equal gewähl ^{"fi h.} leather further plane is the number of controllable Zeiler, * Ane further increased power. With a given line ^ ci · "-rti '^ t the connection

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ORIGINAL INSPECTED

77Ρ 7 52 1 FRG

between the number of levels E and the number of groups η per level from the relationship Z = η '. In a special embodiment of the control arrangement, in which the electrodes in more than

2 levels are arranged, a common one can be used for all electrodes Hole matrix can be provided.

A line is highlighted when all of the electrodes assigned to it Control voltage obtained with forward potential. It is darkened if at least one of the electrodes assigned to it a control voltage with blocking potential, e.g. - 5 V against Cathode.

Preferably it can also be used for the electrodes for column control the same arrangement and division into groups and phases is provided be.

In a special embodiment of the control arrangement with electrodes that are arranged in more than 2 levels, and one common hole matrix, this matrix can preferably be on both Flat sides can be provided with grooves running in the direction of the rows or columns, in which the electrodes are arranged. These grooves then run parallel to one another and the grooves on one flat side, in which, for example, the control electrodes for line control are arranged at right angles to the grooves on the other flat side of the matrix, in which the electrodes for the column control are housed are. In this embodiment, the grooves can be advantageous so far into the matrix on both flat sides that their crossing points each have a hole for the electron flow in the Form display device.

In a further embodiment of the display device as Color television picture tubes can each have 3 adjacent column electrodes be associated with fluorescent coatings of the anode. These editions are then chosen so that they correspond to the 3 basic colors; the first will then fluoresce, for example, green, the next blue and the third red and this assignment to the

3 basic colors are then repeated cyclically, each through the

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3 following columns. Corresponding to the strip-shaped column electrodes can stab the pads for the anodes in strips designed and adapted in their expansion to the size of the column electrodes. For common televisions? becomes the width that's this strip a few tenths of a MAllimetei, tteisplelswein »0.3 m> n, be. Also weave the stripe shape int? punctiform design this chasing up of the anode serving as a screen borrowed. Nor is it necessary for the holes to be in the matrix are round, but they can also be used, for example, as elongated holes be designed.

Sequential control of the individual pixels in rows and columns is required to operate this arrangement. To the consequencex control of the rows are the individual tax groups of the first Electrode level bright control pulses supplied one after the other in repetitive control phases. At the same time they hold Control groups of the second and further levels light control impulses, which last so long, wit »the date of a tax phase of each previous level.

The display device essentially consists of a thermal cathode, a so-called hot cathode, which extends at least approximately over the entire image size on the back of the device and at least one matrix on the flat sides of which the control electrodes are arranged in separate levels, and a fluorescent screen as anode . The whole system is housed in a gas-tight vacuum system, which preferably consists of glass I
is evacuated.

Glass can exist and to a vacuum of at least 10 "· ^ Torr

To further explain the invention, reference is made to the drawing, in whose Figure 1 an embodiment of a control arrangement according to the invention is illustrated schematically. In Figure 2, a special embodiment of a matrix with the control electrodes is shown in perspective. FIG. 3 shows the circuit of the electrodes for the line control and in FIGS. K to 11 the signal curve is explained in diagrams. In Figure 12 is an example of the circuit of.

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ORIGINAL INSPECTED
COPY

77P 7 52 1 RRD trotting, which are arranged in 3 ^T --f \ nen: and for an Oe zimalco ^H n-St ^ 'iPitmg ■ voive ^ hon.

According to Vigur 1 enthHH «lu« vacuum JU Ic. rm? * i ^ device a thermal · = »cathode iü, p.lue Loohrretrix: 6 with flpktrogen 8 and iür dj.» / '»Ileitt'ortsf-hrJ Lurf. _r <^ n? further J..ochra? trir 12 with electrodes 1 * 4 and 16 for the Spe? t ^ nf ort circuit and an anode 20. The entire arrangement is to be arranged in a closed vacuum system, of which only the front wall 2.2 and the rear wall 2'-4 are shown in the figure.

The thpmlscl'i? Cathode 2, which preferably consist of heating wires k Vatui, is arranged between the rear wall 2k and the matrix 6 and extends over the entire image area. The GlühdrJUite 4 of the thermal cathode 2 run along the Ze.U * n, dt * are formed from the holes of the individual matrices. ]>"The holes 28 of the matrix 6 should, for example, form the top row 30. The rows of holes that are arranged vertically below one another are referred to as columns

?. · '> Τ.öcher ? ^r> of the matrix 12 form, for example, the right column 31 of the matrix 12. Between the thermal cathode 2 and the anode 20 eir> e constant voltage * is applied, for example, 3 kV, the emitted electrons from the cathode soft through the holes of the two matrices to the anode and thus to the

^} - *? Luminous screen of the display device accelerated. The height of the anode tension is chosen so that sufficient brightness of the screen is obtained. For black-and-white reproduction, sensitive fluorescent layers such as zinc oxide can be used to keep the anode voltage low.

_{Since 3 color components, red f} green and blue, are required for color reproduction for each pixel, 3 adjacent matrix points are available as color triples for point information. Therefore, the control electrodes 14 and 16 for the column control, which are used for horizontal advancement, form 3 groups with regard to the colors, namely one for red, one for blue and one for green. One of these groups should

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ORIGINAL INSPECTEQ COPY

ss attached to the matrix of the matrix 12 lu in Figure 1 arranged first 3 '"polten Ir ^ tr"? ff s. their? v parent holes with a ° r dashed Umr? ", invention are sided. The in the figure with a dashed Umrandur'p · ⁷ W provided upper holes'} you matrix 1 "form d> * nr: eu *" of the anode 20 has a color point in "tie * rather wines 36 form the nM.chstor holes of Spaltenelektroder" 14 and.. 1b also has a colored point on the anode 20. For this purpose, the anode 20 is provided with a special overlay 38. This overlay can consist _{, for example, of strips;} and from the inside in the figure are only indicated 3 and designated by 39 to 41. These strips 39 to 41 are adapted in their shape and size to the columns of the matrix 12. The strips 39 to 41 are assigned to the groups 34 and 36 and consist of a material that repeats one of the basic colors, green, blue or red, in particular others made of green, blue, or red phosphorus. In the practical embodiment, the preamble of the strips 39 to 41 is in each case about a few tenths? »L τητι, for example etv / a 0.3 ran, V -? Trapen. Except for the one in the

? '"* Figure aivfirt-interpreted strip form of the edition 38 can however also βu.s other geometric structures, for example from individual ones There are squares, rectangular or circular supports. The pc editions are then each for one color in the Direction c'ct strips 39 to 41 arranged one below the other.

In the embodiment according to FIG. 1, all are control electrodes shown as wires. However, the electrodes can also consist of flat strips, for example by vapor deposition of conductor material each one flat side of the relevant hole matrix can be produced.

In the embodiment of the vacuum image display device according to As in FIG. 1, FIG. 2 shows the thermal cathode 2 and the anode 20 with a special embodiment of a matrix 44 arranged between the walls 22 and 24 of a vacuum system. The matrix 44 can, for example, consist of a flat glass body exist, which on its one flat side with vertical shooters 46 and on the opposite flat side with horizontal

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ORIGINAL INSPECTED _copy

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Slots 48 is provided., Between the slots 46 are laughing webs 50 formed by the material of the matrix 44 that has not been removed, on which wire- or strip-shaped »electrodes 52 b? w 54, which are used to control the column, so perpendicular and parallel are arranged to each other that dlo electrodes 52 in a plane and the electrodes 54 in Girier running parallel thereto further level. These electrode planes are then in the direction of movement of the thermal cathode emitted electrons one behind the other »arranged.

In the same way, the remaining parts of the slots are made on the opposite flat side of the matrix 44 Formed webs 60 which are provided with electrodes 62 and 64, respectively. The electrodes 62 and 64 are horizontal with respect to the matrix 44 arranged and are used for row control. The depth of the slots 46 and 48 can now preferably be chosen so that A hole 66 is created in each case at their crossing points within the matrix 44. These holes are then used to control the Electrons move from the cathode 2 to the anode 20, which is the screen the display device forms.

In the control arrangement according to FIG. 3 for a vacuum image display device according to the invention, the thermal cathode with 2, the first matrix with 6, the electrodes for the line control with 8 and 10, the second matrix with 12 and the Electrodes for the Column Steuen.mg with 14 and 16 and the anode with 20 designated. Between the "thermal cathode 2" and the anode 20 there is an unspecified direct voltage source which supplies an anode voltage U. of, for example, 3 kV. The row electrodes 8 are arranged in a plane marked I and the row electrodes 10 in a plane marked II also include a clock generator 68 of a control device 69, which _{supplies clock pulses U T} at its output, which are predetermined to a shift register 70, preferably designed as a ring counter, the stages of which are denoted by 71 to 74. If the display device is used for television picture reproduction, the clock pulses U _T The ring counter 70 is used for control

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COPY ORIGINAL INSPECTED

the Zeilerielektroden 8 Ir ι ·; γ rCbeiit I, Ί · Λλ further Schieberegistor HO, dp -. vorzugsweiun nfjr-nfallp se.tiv designed as a ring counter and its identification with stiffeners 81-8} denote s.lnt * · ;: .!>·; Ί <. for .control of the cells ¹ "U 1 He Ink trode H) in or: F: b» »ne 11.

Km from the Zeileaelektro M in dor Kt) PPP i form of OBVR>, the first line of each db seen the prst ", fifth and ninth an electrode group ^r t., Din with ej.r <c> m common connection conductor provided and level 71 of £ Jc: hlebH register 7 ^r > ango-

JO are closed. Similarly Where J se are the second ??, sixth un 'tenth electrode connected to a Ft * a farther Stauergruppo bj: is provided raeinsamen terminal conductor and connected to the stage 72nd The third, seventh and eleventh electrodes form a third control group C ₁ , which is connected to the stage 73. A"

fourth control group d .. is formed for the fourth, eighth and twelfth ^ ¹ cell electrode, Π. · * - ^ e Onjipp «ta *: attached to dir * Gtu.fr>"? ■ '* .

In the plane II '.nit the lil ^ k + roi' ^ M 10 we-'dfn .V-> veil.s j \ #r = f> UF? 0? Inandf "rfolgende electrodes fi! ^v t <? r tax grxiDne a-, zvisarar; »narrow grasps and are at level 91 de:» Schlf »b» r2p: t r-ters BO ^ rif; * - closed. Similarly // else the electrodes of the control Rupr ^ · b ₂ to the Stn.fe 82 and the third electrode group are connected to stage c ,, 83rd In the same way, electrodes in both levels I and II, assigned to further rows, are connected to IAe control groups.

The control electrodes would be used individually to switch the image points switched, so would for the row and column progression Although one level of electrodes is sufficient in each case, the expenditure on switching and control elements would be correspondingly large, because each individual control electrode then requires an electronic switching element, for example a transistor. To the invention therefore the electrodes for the row and possibly also for the column advancement in several Arranged levels, the electrode are combined in a special way in groups. Each of the electrodes 8 and 10 can connected between two voltage levels opposite the cathode 2

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COPY ORIGINAL INSPECTED

will. I ¹ ^ i tine ΰρι · -ν \\ - Μ: £ ϊ. · Όομ * 1, zh zero volts, makes the holes of the Mfltriy ⁽ . Dor rjugi-hcir -igtm line for the electrons to the anode? .O through] !, 'ί-ig, which the Leu cn ^J. screen represents. The other level, e.g. - ^ V, blocks (U-? electrons.

Only when all electrodes assigned to the same Bi Id pur * f. Are pitted can dip electrons pass through the matrix hole assigned to the image point in the anode.

The lines are switched on with clock pulses from a control voltage, the period duration of which corresponds to the light duration of a line. These clock pulses are taken from the clock generator 68 or, in the case of television picture playback, from a video signal and cause the subsequent shift register 70 to generate its output pulses U ^ ₁

Vj to TJ, -, / νου step to step one after the other.

Trr! Xi βς: πτη'.ΐ! after- figure Λ, * i \ Csxi. the St. your voltage U ^ over the .'fit t - ".- f, cf> tra '; - r rs *; ,, ro.il 7ΐ · - Ze't I ₀ a clock pulse Vm from Tnkt ^ tbe? ¹ bK on Đỏ eic * ^'1 Stuip 71 όο, α ^ chiebpregister ·; 70 ge-C irr b ρ η wf-rM ^£ * n mils;...' xe 'OD' Tak ^*:..: "i ^v ! lF ^r . ' _T v / iid the shift register VO p.nprei-ept- and the; ^; 71 g - jf »; 5t f ^ bt NEN / \ Uy uspangsimpvls ₁ with a potential of bp.l--.5idejswei.se - 5 V against the cathode on <. * - * e n her r'isoordnehr Stcnerfcrupp ¹ 'of the row electrodes 8 in the plane. J. This AirsgHnisinj.pu.ls U ^, whose length is from t ₀ to 2 *> t. n ^ ch Fi gui ¹ 5, the Lpucbtdauer L determines the top line and represent the same period T the Taktjirpulse U ^ _1, it is also supplied to the CO shift register as an input. The first stage 81 of the shift register 80 then gives an output.! Rcpuls U, ^, which the electrodes of the first fit-your group a _? in t ^ er level II is fed. The lighting duration L of a line will be 6/4 / usec for example with 625 lines and 25 frames per second. In contrast, the control signal predetermined by the shift register 80 for the control phases of the electrodes in level II lasts until all control groups ^7C in level I have been controlled through one after the other. Thus, between t and t ₁ , only the two control electrodes assigned to the upper row carry a pass signal at the same time, and thus only this row is controlled. At time t ^ becomes with

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ORIGINAL INSPECTED COPY

_{A new control signal U 72 of} the second control group b .. of level I is supplied to a new clock pulse U ™ according to FIG. 6 from the stage 72. Since the second electrode of control group a ₂ assigned to this group of lines in level II according to FIG. 9 still has a pass _{signal, line 2 will light up until time t 2,} electrode group C ₁ according to FIG. 7 is controlled with control signal Uy. Correspondingly, according to FIG. 8 at time t, with a new clock pulse U _T, stage Ik will control its assigned control group d ₁ of level I with its output signal Uy ^ and the fourth line will light up, since control group a ₂ in level II with its Control signal Ug ₁ according to Figure 9 still has a pass signal. In a corresponding manner, according to FIG. 5, at time t ^ a new control pulse Uy _{1 is} supplied to the associated electrode group a .. in level I, which at the same time excites shift register 80 for controlling level II, which according to FIG _Q2 controls group b _2. After the line advance has passed through the second control phase _{, the third control group C 2 of} the electrodes 10 in level II _{is controlled at time te with the next control pulse Uy 1} according to FIG. 11 from the stage 83 of the shift register 80 with the control pulse Ug.

For the usual television picture with a 625 line system, the Grouping of the electrodes can also be selected in a simple manner so that the odd-numbered ones are initially used when viewing television images and then cycle through the even-numbered lines.

The column control of the device, i.e. the scanning of the pixels in each row, can be carried out in the same way as the line control can be done. The switching speed of the column control, i.e. the frequency of the clock voltage U «, must be as follows be chosen large so that all pixels of the line are sequentially controlled during the lighting period of a line. If the brightness of the screen is not sufficient with point-by-point control, the image information of an entire line can be in be temporarily stored in a multi-level intermediate register. Then all point signals of a line are then at the same time fed to the column electrodes in one plane and

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each of which connected to one of the shift register outputs is.

The control of the brightness of the display device for a television picture display can be done by a further, vertically built-in electrode level or via the electrode system already available for column control by the Column control pulses are modulated in their amplitude with the brightness. If the anode voltage is kept sufficiently low control of the brightness in the anode circuit is also possible.

The flat panel display device can also be used to display variables that change over time. The horizontally arranged electrode system is then used for the Y deflection kung and the vertically arranged electrode system for the X-deflection. The time base can be set using one of the incremental procedures being controlled.

With an arrangement of the row electrodes in 3 levels I to III according to FIG. 12, control with the decimal code is possible. These row electrodes, which are not designated in more detail in the figure and are shown only by a small circle, can, for example, be arranged on 2 hole- matrices that the electrodes of level I on the right flat side of the first matrix and the electrodes of the Level III is on the left flat side of the second matrix of holes and the level II electrodes are located between these two matrices. In this arrangement the electrodes of level I are each wells arranged in 10 control groups, which are connected to 10 common control lines. These control lines form the first decade and are denoted _{by D 1 in the figure.} In level I, the first, eleventh, twenty-first, and thirty-first lines, and so consecutively, each line at a distance of 10 electrodes following a control group. In the same way, the second, twenty-second, thirty-second and those following at a distance of 10 electrodes are connected to form a group. The control lines of the decade D ₁ are in the figure

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denoted by a to k. For example, the screen may contain 1000 lines to be controlled with a three-digit decimal code. Correspondingly, 10 consecutive electrodes of the second level, for example electrodes 1 to 10 and electrodes 11 to 20, are combined to form a control group, which at the same time form a control phase and are connected to a common control line, of which only the one in the figure the first three and the last are shown and denoted _{by a 2} , b ₂ , C ₂ and k _2. These control lines a ₂ to k ₂ form the second decade D ₂ . In this embodiment, several groups of tens of control electrodes are connected to a common control line, each of which is 90 electrodes apart in the relevant electrode plane, ie electrodes 1 to 10 and electrodes 101 to 110 and 201 to etc. are formed _{on control line a 2} One steering group at a time. In the same way, electrodes 11 to 20 and 111 to 120 as well as 211 to 220 etc. are connected _{to control lines b 2} of decade D _2. In level III, 100 electrodes are combined into a group, the control lines of which form the third decade D i. For the sake of simplicity, only the first two of these control lines are shown and electrodes 1 to 1 to and the control line b are assigned to electrodes 101 to 200, of which only 3 are indicated in the figure. In the same way, electrodes 101 to 200, 201 to 300, up to the last 901 to 1000, which are not shown in the figure, are each connected to a control line of decade D.

For each of these decades, for example, one shift register can be used be provided, which is preferably connected as a ring counter and after a signal pass back to its first level switches back. These 3 ring counters then each have 10 control levels. The electrodes of the first control group in level II receive a control signal that causes the electrons to pass through the relevant rows and lasts as long as until the electrodes of all control groups of level I are switched through one after the other. After the signal has passed through the second tax group of level II receives the first 10 lines

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their signal, which lasts until all control groups of the
Level I have been switched through again one after the other. Of the electrodes in level III, the electrodes receive the
first control group, which are assigned to the electrodes of lines 1 to 100, a pass signal for the electrons until the control groups of level I in 10 control phases 100 times and accordingly also the control groups of level II in a control phase 10 times in succession. To light control 100 rows of electrodes of level I, only 10 signal changes are required for the electrodes of level II and only a single signal with a corresponding duration is required for the electrodes of level III.

8 claims
12 figures

80984.5 / 0408

Claims (8)

77P 7521 FRG claims 2720261 1. ) Arrangement for controlling a flat display device with a vacuum system which contains a thermal cathode as an electron source and a hole matrix for row and column control as well as electrodes connected in groups, characterized in that at least for the holes (28) of the individual rows (30) In each case at least two separately controllable electrodes (8, 10) are provided and are arranged in separate planes (I, II) parallel to the flat sides of at least one hole matrix (6), and that of the electrodes (8) of the same plane (I) at least each three adjacent groups of rows (x ^ to x,) are combined, and that of these electrodes (8) in each case one electrode of the different row groups (x ^ to x,) form a jointly controllable electrode group (a,. to d ₁ ), and that in the further levels (II, III) all electrodes (10, 11) of the same group of rows (X ₁ to X 1) form a jointly controllable electrode group (a ₂ to Cg or a 1, b 1) en. 2. Arrangement according to claim 1, characterized that the number of electrode groups is the same in all planes. 3. Arrangement according to claim 1 or 2, characterized in that more than 2 electrode levels one common hole matrix (44) are assigned (Fig. 2). 4. Arrangement according to claim 3, characterized in that the hole matrix (44) on both flat sides are provided with grooves (46 or 48) running in the direction of the rows or the columns, in which the electrodes (52 and 54 or 62 and 64) are arranged and their intersection points each form a hole in the matrix (44). 5. Arrangement according to one of claims 1 to 4, characterized in that also for the holes (29) of the individual columns (31) of a matrix (12) at least, lewsils 2 separately controllable electrodes (Ik, Ki) are provided, which are arranged in separate planes parallel to the flat sides of at least one hole matrix (12) (Fig. 1). 6. Arrangement according to claim 5, characterized in that in each case 3 adjacent column electrodes (34, 36) fluorescent coatings (3β) assigned to the anode (20) are, each of which its edition (39 or 40 or 41) is assigned to one of the 3 basic colors (Fig. 1). 7. Arrangement according to claim 6, characterized in that the supports (39 to 41) are strip-shaped are designed (Fig. 1). 8. A method for operating the arrangement according to any one of claims 1 to 7, characterized in that for sequential control of the lines (30) the individual control groups (a ₁ to d ₁ ) of the first slektrode level (I) successively in repetitive control phases HeI! Control pulses (Uy ₁ to Uy ^) are supplied, and that at the same time the control groups (a «to C ₂ or a ,, b,) of the further electrode planes (II, III) light control pulses (Uq ₁ to Uq,) receive the same length the duration of a control phase of the previous level (I or II) (Fig. 4 to 11). 809845/0408