DE2264109B2 - Displacement gas discharge matrix display device - Google Patents

Description

The invention relates to a displacement gas discharge mstrix display device according to the preamble of claim 1.

In a known display device with two base plates and two electrode groups and one The gas discharge space arranged in between is displayed by alternately selecting the two Generates electrode groups, which requires a complex control circuit (US-PS 34 99 167).

In another known display device, a display takes place by exciting an electroluminescent phosphor, the display according to Turning off the excitation stops (US-PS 32 62 010). A display device has also been proposed (DE-PS 22 39 446) in which the Display pattern itself is shifted on the screen. After shifting the display pattern to the The shift is ended at the desired point in order to obtain a fixed display for J5.

Finally, it is proposed in DE-PS 22 39 446 to provide electrode fields on both base plates of a display device.

The invention is based on the object of providing a display device of the proposed type (DE-PS 22 39 446) with improved writing and reading options. This object is achieved by the features of the characterizing part of claim 1. Further developments of the invention are specified in the subclaims ⁴ ^.

The invention leads to the advantages that the display and displacement discharges are independent, which enables non-destructive reading, multiple writing and flicker-free writing and that the number of write driver amplifiers required can be reduced.

The invention is described by way of example with reference to the drawing.

F i g. 1 shows a perspective view of a partial illustration in section of an exemplary embodiment of a Display device according to the invention;

FIG. 2 is a sectional view of the main part of the display device of FIG. 1;

F i g. 3 is a schematic diagram for explaining the principle of the invention;

Fig. 4 is a circuit diagram for explaining an embodiment of the invention;

5A, 5B, 6A, 6B, 7A, 7B, 8A and 8B show the course of the signals to explain the ^{mode of operation M of} other exemplary embodiments of the invention, and

Figures 9 to 13 are schematic representations of the Electrode assemblies used in other embodiments of the invention.

Description of a preferred embodiment

1 and 2 show a perspective view Sectional view of part of a plasma display panel used in the display arrangement according to FIG Invention use can bark. The plasma display panel consists of a lower part 10, which the Forms a shift layer for the discharge spots, and an upper part 20 serving as a display layer

The lower part 10 comprises a lower base plate 11 on which a plurality of displacement _{electrodes a I 1} ύ 1 ... a 2 ... are arranged in parallel and at regular intervals. Further, a start electrode w and maintenance electrodes ArI and JEr 2 are provided. These electrodes are covered with a dielectric layer ί 2, e.g. B. made of glass with a low melting point, which carries insulating partitions 13 which form the displacement channels for the discharge point, which run in the perpendicular direction with respect to the electrodes.

While the upper part 20 serves as a display layer and consists of a transparent upper base plate 21, a large number of electrodes yia, yib, y2a, y2b ... parallel and at regular intervals are arranged on its underside on which a plurality of insulating partition walls 23 are arranged in a direction perpendicular to the electrodes.

The upper and lower parts 20 and 10 are arranged adjacently but apart from one another with a view to their perpendicularly intersecting electrodes leaving a space with an ionizable gas trapped therein between the parts 20 and 10 include.

The lower part 10, i.e. H. the shift layer, has electrodes which are driven in such a way that a lateral discharge is sequentially shifted between adjacent electrodes.

3 shows the above-mentioned electrode control, in which the displacement electrodes a 1, b I ₁ c 1, a 2 ... are periodically connected to the common power supply lines A, B, C and D. The power supply lines A, B, C and D are fed with four pulse voltages which are successively shifted in phase with respect to the neighboring ones.

In the upper part 20, ie in the display layer , adjacent electrodes are connected in pairs, for example yia and y 1 b, y 2a and y 2b ... in such a way that a maintenance voltage for the discharge and a write-in voltage are supplied to electrodes in pairs at suitable times .

Referring to FIG. 3, the operating principle of the plasma display panel will be described below. The process begins with the application of an ignition voltage to the maintenance electrodes k 1 and k 2 in order to initiate a discharge between them. Thereafter, the discharge is maintained by applying a float voltage. In this state, after a displacement voltage is applied to the starting electrode w, a discharge is triggered between the electrodes k 2 and w. Thereafter, the application of a displacement voltage to the electrodes a 1 and b 1 leads to a discharge between them. Then the application of a displacement voltage to the electrodes b 1 and c 1, after the voltage at the electrode a 1 is switched off, leads to a discharge between the electrodes bi and c 1.

This displacement process is achieved by the excitation current effect, i. That is, it is exploited the phenomenon that an ignition voltage VFl between

Electrodes that are adjacent to a discharge area, drops below the normal ignition voltage VF , which is done by supplying electrons, ions and metastable atoms from the area of the discharge to the adjacent electrodes

ίο displacement voltage Vi such that VFi <Vi <VF and by applying a displacement voltage Vi to the power supply A to D in successive steps, a discharge point can be moved to the end of the panel.

is By applying a writing voltage to selected pairs of electrodes in conjunction with the above Discharge point shift described in the shift layer 10 becomes a discharge point a position between the display electrode pairs generated which corresponds to the position of the just-moved discharge spot example, if a write-in voltage to the Anzeigcciekiroden y \ a and yib z \ i such time applied to the one discharge spot Ps in the shift layer 10 between the electrodes d 1 and c 1 is shifted, a discharge light spot is formed by the discharge spot Pd Pd is a wall voltage generated so that thereafter the discharge spot Pd yia by a sustain voltage between the electrodes and yib is maintained.

In this way, the desired display can be made in the display layer 20 by applying a write-in voltage to the display electrodes in connection with the times at which the discharge spot is shifted

J5 can be achieved in the shift layer.

In the shifting and displaying operations described above, the partition walls 13 on the shifting layer 20 separate the discharge spot Ps created between adjacent electrodes, in a number of such spots corresponding to the number of

Corresponding to display electrode pairs, which have a

sc-.iebungskanal along each display electrode pair form. The partition walls 23 on the display layer 20 'separate the luminous discharge spot Pd between the display electrodes of each pair and the position of which corresponds to a displacement discharge and thus defines fine picture elements. The effect of these partitions 13 and 23 can also be passed through Use of auxiliary electrodes for a shield reach voltage, also through strip-shaped

Layers of a material of relatively small secondary

emission coefficients or with the help of electrodes, whose pattern is expanded at predetermined points

Referring to FIG. 4, the

detailed operation of an embodiment of the display arrangement according to the invention is described. The aforementioned plasma display panel bears the reference number 1. The displacement electrodes are on each other opposite sides of the panel 1 led out,

μ which is denoted by Xi, Xl, Yi and K2. A maintenance signal generator 30 is controlled by clock pulses from a clock pulse generator 3t to generate a maintenance signal. After a data signal has been received by a matching circuit 32

ii5 a control signal is separated and fed to a shift logic circuit 33 so .vie an operating mode logic circuit 34 through which an AND gate circuit 35 K is opened, with the bistable at the same time

Flip-flops 36 and 37 are set as shown.

By opening the AND gate circuit 35K , a driver amplifier 38 for supplying the maintenance voltage is applied with a maintenance signal, while the other of these drivers 39 is applied with a maintenance signal whose phase is shifted by a phase shifter 40 by the amount π. Thereafter, a voltage exceeding the ignition voltage VF is applied to the sustain electrodes ki and k2 obtained from the drive amplifiers 38, 39 for the sustain voltage to cause a trigger discharge. The AND gate circuits 41a, 41i>, ... and 41n on the VI electrode side are opened by the set output from the flip-flop 36, and two maintenance voltages as shown in Fig. 5B are applied to the display electrodes each Pair of

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and 44 applied by logic circuit 42 and 44 controlled by logic circuit 42 for the maintenance voltages. At the same time, the AND gate circuits 45a, 456 ... and 45n on the side of the X 1 electrode are also opened by the set output signal of the bistable multivibrator 37 as preparation for the shift operation.

After a start signal has been supplied to the shift logic circuit 33, the AND gate circuit 35 W is opened in order to control a start driver amplifier 46 which applies a voltage to the start electrode w which is shown in FIG. 5A is denoted VW, that is, with a voltage Vl and a sustaining voltage ± Vs / 2 within a predetermined period of time. At the same time, the four-stage counter 47 begins counting.

Pulse trains VA to VD, as shown in FIG. 5A, and which include a shift voltage V2, a maintenance voltage ± Vs / 2 and overlap each other, are supplied to the power supplies A to D from the drive amplifiers 48a to 48c / for shifting via the AND gate circuits 45a to 45m, which is determined by the set output signal the bistable flip-flop 37 have been opened. In this case, the pulse trains VA and VC are shifted by 180 ° with respect to the phase of the pulse trains VB and VD by a ^ phase shifter 50a and 506 accordingly.

The discharge spot generated in this manner between the electrodes k 2 and w is by means of the tripping current, generated by the triggering discharge between the He ^h altungselektroden k 1 and k 2, gradually to the right in accordance with the activity of the Ringzählschaltung 47 moved. For this skin, the starting voltage Vl, the displacement voltage V2 and the maintenance voltage are chosen so that they meet the following relationships with respect to the ignition voltage VFl between the electrodes, which are subject to the influence of the excitation current effect from the neighboring region:

I Vl + V2 | > VFl I V2 + Vi / 2 I> VFl

Furthermore, pulse trains of the voltage ± Vs / 2, as shown in FIG. 5B, are those of the two Driver amplifiers 43 and 44 supplied maintenance signals, soft at the terminals of the display electrodes Pairs of the display layer on the side of the electrode Y 1 are, as described above, shifted in phase from one another by 180 °.

The display information received by the matching circuit 32 is decoded by a decoder 51 for each line and supplied to the write driver amplifiers 52a, 52b, ... 52n at times corresponding to the position of the discharge shift in the shift layer. The output of each

κι the write driver amplifier is via the OR gate

icrcircuits 53a, 53 £> and 53n to an electrode

of each pair of display electrodes and combined with the maintenance voltage Vs / 2 corresponding to the is fed to another electrode. At the same time will

-, -> a light discharge triggered at one point, which corresponds to the discharge that results in the displacement layer due to the excitation current effect the discharge was triggered in the shift layer.

in a write-in voltage V3, corresponding to the Write information is supplied at the times of the float voltage indicated by small circles in F i g. 5B, and at which a luminous discharge is caused. In the absence of a registered

r, information, the maintenance voltage Vs / 2 is also supplied at times indicated by small circles. In Fig. 5B, reference characters denote Vy \ a. VyXb, Vy2a ... voltages which are fed to the electrodes yia.yXb.y 2a ...

jo If there was once a luminous discharge, it becomes a Wall voltage is generated, and thereafter the discharge can only be maintained by applying a float voltage. Thus, if the Discharge on one side of the displacement layer

j-, is shifted, the discharge on the side of the Display shift kept quiet. An ignition voltage between the electrodes of a display electrode pair is caused by the excitation current effect Discharge in the shift layer, for example assumed to be VF2, this is the case chosen that the relationship applies:

V3 + Vs / 2> VF2 <VFl

After completing the writing of an image grid

the four-stage ring counter 47 is reset to ZERO by a control signal. The result of this is that only the discharge between the sustain electrodes Jt 1 and Ar 2 on the side the shift layer is preserved, and the Information shared between the electrodes each Display electrode pair is inscribed, dur-h the Maintenance voltage is maintained, which was supplied to them on the side of the Vl electrode. Of the Course of the maintenance voltage, which each display The pair of electrodes is supplied within the period T2 in Fig. 5 The period Π represents the period of the writing process and the period T2 the period of the display process.

The display on the display layer can also be in

in a direction perpendicular to the display electrodes. This is described below. In order to achieve such a shift in the display, the flip-flops 36 and 37 reset what with the help of the output signal from the operating mode logic circuit 34. Accordingly, the AND gate circuits 45a, 456, ... and 45 / J locked on the side of the X-electrode, and the Gate 54a, 54f> ... and 54 / j on the side of the

V electrodes are open. Furthermore, the AND gate circuits 41a, 4Xb ... and 41 η on the VI electrode side for supplying the reverberation voltage are blocked and the L'ND gate sounds 55a, 55b, ... and 55n are open so that two types of float voltages can be applied to the side of the A "2 electrode.

The ring counter 47 begins under these conditions with the counting operation, whereby the discharge spot on the display layer according to the switching on the displacement driver amplifiers 48, 43, 43i, 48c and 48d is shifted.

In order to achieve this displacement effect, it is necessary to send information to the display electrodes before the time of the write operation, so that a display on every other pair of display electrodes can be done. In this way, the information is sent to either even or odd

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Display is made in the same way as in the shift layer by means of the display electrode pairs moved, which have not been applied with the information. After the content of the When the display has been moved to a predetermined location, the flip-flops 36 and 37 are set again to allow a fixed display.

The following is a description of the operation as the display pattern on the display layer transferred to the shift layer and to a desired location in the shift layer is moved. This is then transferred back to the display layer in order to be displayed there will.

First, the trickle discharge is ended, and the bistable flip-flops 36 and 37 become reset. A transmission driver amplifier 56 is operated using the output of the mode logic circuit 34 controlled. A transmission voltage from the transmission driver amplifier 56 becomes over all electrodes on the side of the X2 electrode an OR gate 57 is supplied, whereby the luminous discharge pattern on the display layer can be transferred into the shift layer. To this The point in time is the discharge pattern between the electrodes of adjacent electrode pairs in the Shift layer has been sustained by a sustaining voltage applied by the side of the A "2 electrodes is fed. The bistable flip-flops 36 and 37 are then connected by the Mode logic circuit 34 reset, and the display pattern that is transferred into the shift layer is shifted along the display electrodes according to the contents of the ring counter 47.

As soon as the display pattern has shifted to a predetermined position, a control signal is supplied to the write-in driver amplifiers 52a, 52b, ... and 52n so that a write-in signal is applied to all electrodes on the Y ! Electrode side, whereby the discharge pattern in the shift layer is transferred again to the display layer. Thereafter, the display pattern transferred back into the display layer is maintained by means of a maintenance voltage applied to the Yi electrode side.

After the display has been maintained for a desired period of time, a clear pulse is sent to the

Electrodes of all An / cigeelekltodeitpaate from the side of the Vl FJeklrode / u supplied to the point in time shown in FIG. 5B is denoted by Ε / *. The wall voltage is also deleted by the delete pulse to delete the display. A new writing process is then initiated, as previously described. For this purpose, 5B respectively, reference numerals 7 * 1, T 2 and 7 "3 g in F i. The writing period, the display period and the next writing period. The voltages Va to Vd, which are the power supply lines A supplied to D, may also only by the Pulses VI are formed; however, for a high-speed displacement, it is appropriate that the voltages VA to VD are composed of pulses V2 and Vs / 2, as was the case in the aforementioned embodiment, since the wall voltage is extinguished very quickly after the displacement discharge will.

The F i g. 6A and 6B are representations of the Sigrisl curves for explanation d? ^r Operation of another embodiment of the invention. VK 1 and VK 2 denote voltages which are fed to the maintenance electrodes k X and k 2. The voltages VKX and VK 2 are chosen such that 2Vk> VF applies. In the process, an induction discharge is generated and continuously maintained by the pulses Vs. The voltages VA to VD supplied to the current conductors A to D correspond to those shown in Fig. 5A, through which a discharge is shifted in the manner described above. The electrodes yla. y2b, y3a, y4b, / 5a ... are applied with the voltages VyXb, Vy 2a, VyIb, VyAa, Vy 5d, Vy 6a , each being composed of pulses Vs and V4. The pulses of the voltages Vy Xb, Vv 2a, Vy3b, Vy4a ... are shifted in phase with respect to the above-mentioned voltages VyIa, Vy2b, VYZA ... and the pulse V4 is in each case selected in such a way in its amplitude, that the relationship V4 + Vs> VF2 applies. Furthermore, the pulses of the voltages VyIa _1, Vy2b, Vy 3a, Vy4b .

In the above embodiment, the pulses for shifting the excitation discharge are supplied at the same time as the hold pulses, so that there is a possibility of a discharge between opposing electrodes, which leads to incorrect operation. This can be avoided by shifting the times at which the pulses of the voltages VA to VD and VyIa, Vylfe, Vy 2a, Vy2b are fed, as shown in FIGS. 7A and 7B negative pulse pairs 2N. However, N can be chosen in such a way that it forms a desired component, that is to say '/ 2. The ones with small circles in FIG. The points in time indicated in FIG. 7B represent the points in time at which the write-in pulses are supplied, as is the case with FIGS. 5B and 6B is the case

FIGS. 8A and 8B show signal curves for explaining the mode of operation of a further example of the invention in which the dielectric layer 12 in FIGS. 1 and 2 are omitted The electrodes ArI. Ar2, W, Al, b \, el, dl ... are arranged in the exposed Gaseniiadungsraum In the present embodiment, DC voltages ACi and VKZ which a level V6 to V5

obtained, applied to the maintenance electrodes ki and kl in order to obtain the triggering discharge. DC voltages VW and VA to VD of amplitude V6 are periodically fed to the power supply lines IV and A to D. The conditions for the corresponding voltages are as follows:

(V5 + V5)>VF> VF \ <VFV (Vft + Vy)> VF \ (VVs 12 + V7)> VF2

VFV denotes the discharge voltage / between opposing electrodes and V 7 denotes a write-in voltage. For this ("all

are the voltages Vy \ a. Vy \ b, VyIa. Vy 2b the

same as in the K i g. Figures 5A and 5B are shown; however, their course can be as in FIGS. 6A and 6B can be chosen.

In the exemplary embodiments referred to above, which are based on FIGS. Referring to 1 through 7, there will be a discharge between the electrodes caused by the dielectric layer and shifted so that the arrangement according to this embodiment is hereinafter referred to as "indirect discharge system". In which Embodiment according to FIG. 8, a discharge is triggered directly between adjacent electrodes and shifted so that this arrangement is hereinafter referred to as the "direct discharge system".

In either discharge system, dielectric layer 22 is on top of the display layer for storage and storage Display arranged. The display panel of the indirect discharge system allows a shift operation on the display layer and a transfer operation of the display pattern information from the display layer to the shift layer.

Accordingly, in an indirect discharge system, non-destructive reading can be achieved by holding the Display in the display layer can be achieved, which is done after the write operation, by the Discharge is transferred into the shift layer as a triggering discharge. A consecutive one Shifting the display in the shifting layer as well as a subsequent readout of the shifted Information by means of a brightness detector or a discharge current detector, which at the end of the Displacement attached to the displacement layer can be made. In a similar way can also be read with destruction of the information by successively shifting the display on the display layer.

Further, the display can be effected in parallel by transferring the display on the display layer to the shift layer. The display in the display layer is erased, the transmitted display is shifted to the shift layer and the display is shifted back into the display layer. In addition, a large number of reproductions with the same content can be achieved if the number of ^; j; e is left untouched in the display layer. In addition, after the first writing period, by writing in further information without erasing the first written information and rewriting, a second discharge shift can be achieved, so that various types of writing are possible.

The display panel with direct discharge has no storage function in the shift layer, see above that the shift layer can only serve to shift the trigger discharge and not the Displacement of the display, multiple writing and non-destructive reading as above described permitted. Since the display can be shifted on the display layer, a perform destructive reading. In the case of destructive reading, non-destructive reading can also be used be made possible by the fact that rewriting means are provided.

The number of write driver amplifiers for the display layer can be reduced by referring to Figs. 9 and 10 is switched to the solid and broken lines by means of a gate arrangement. If, for example, the electrodes are divided by y \ ay \ b, ... \ n π electrodes in FIG. 9, the writing operation can be carried out with a number of 1 / n driver amplifiers corresponding to the number of electrodes. However, the writing speed is decreased by the ratio Mn . In FIG. 10, the electrodes are alternately exchanged, so that this method is also suitable for a field display with an interline.

FIG. 11 is a batch writing or a line break with the help of the division of the starting electrodes w \, and w2 possible, as stated in the case of Figure 9, however, the electrode A i, ft I. el, d \ ... as previously fed continuously. Fig. 12 shows the case in which the starting electrodes w \, wi '... correspond to the electrodes yia, y \ b, y2a. Y2b, ... are divided and connected to the power supply lines Wi and Wl. as will be so that an interlaced display and the like. possible in the embodiment of Fig. 10.

Fig. 13 illustrates another embodiment of the invention in which display is made on a large screen and a small number of conductors are used. The writing can be achieved with the help of the logical products on the power supply lines Y 1 to Ym and WX to Wn . If, for example, the power supply lines K1 and W2 are selected, then a writing takes place at the electrode y2i at a location to which the discharge has been shifted. It is possible to make the selection mxn with the help of the digits m and π of the power supply lines Yl to Ym and IVl to Wn . Accordingly, the number of driver amplifiers can be reduced significantly.

In addition 9 sheets of drawings

Claims (4)

Claims, - 1. Displacement gas discharge matrix display device with the features a) two parallel opposing base plates, dSe enclose a gas discharge space between sieves, b) a plurality of parallel, periodically interconnected electrodes on one plate, c) a dielectric Layer to cover electrodes, d) lateral, flat gas discharges between two adjacent electrodes, whereby these gas discharges can be shifted step by step from electrode to electrode by displacement voltage pulses and e) a large number of partition walls running perpendicular to the electrodes, so that the between two electrodes burning discharge is separated into a multitude of individual discharge spots, characterized in that 1) the second base plate (21) also carries a large number of parallel electrodes (yla ...) which are perpendicular to the electrodes (al, b \ ...) on the first plate (IO) VCrIaUfCn, 2) at least the electrodes (yla) are provided on the second plate (21) and covered with the dielectric layer (22) the partition walls (23) ..., in number to the number of electrodes on UiT erstt.i plate (10 ) corresponds, and 3) this two-way base plate (21) designed in this way serves as a display plate (IiO), with lateral, flat discharge spots (Pd) being ignited at a predetermined display point by a writing voltage pulse when the gas discharge burning on the first plate (10) ( Ps) has reached the position opposite the display point by shifting it 2. Display device according to claim 1, characterized in that the electrodes (a I, b \ ...) on the first plate (sliding plate 10) are covered with a dielectric layer (12) and with that of the number of electrodes on the display plate (20 ) corresponding number of perpendicular to the electrodes (a 1, b 1 ...) extending partition walls (13) are provided, and that the display on the display plate (20) unchanged on the sliding plate (110) by applying a transmission voltage from a transmission driver (56) can be transferred to the electrodes of the sliding plate. 3. Display device according to claim 2, characterized in that at one end of the sliding plate (10) one of brightness detectors or Discharge current detectors existing reading devices; is provided, whereby the on the The display transferred to the sliding plate can be read out by moving it step-by-step. 4. Display device according to one of claims to 3, characterized in that the electrodes of the display plate (20) in groups (y \ a, ... \ yUa, ...) can be switched on one after the other and the writing in these groups takes place one after the other. 5, display device according to one of claims 2 to 4, characterized in that the electrodes of the display plate (20) are periodically connected to one another and the connected electrodes are simultaneously acted upon with writing voltage pulses, and that each period (yii, yl2, .. .; y21, y22,.,.) a start electrode (w \, w2 ...) of a corresponding length is assigned to the sliding plate (10) so that the writing takes place in one period after the other by adding the to the individual start electrodes (w 1, v / 2, ...) associated discharges are shifted one after the other.