JPS5924891A - Discharge display panel driving system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving method for a so-called AC type plasma display panel, which is an external electrode type discharge display panel.

In this type of plasma display panel (hereinafter abbreviated as display panel), a plurality of generally transparent row electrode groups parallel to each other and a plurality of generally opaque column electrode groups parallel to each other are arranged in an IJ wax-like arrangement, A method is generally known in which an ionizable gas is interposed between the two electrode groups and the intersections of two selected row electrodes and two selected column electrodes are displayed by discharge light emission. In the above display panel, the electrode selection method of the row electrode group and the column electrode group is controlled in response to the input signal.
It is possible to display a c-maru image. For example, one of the row electrode group and the column electrode group sequentially and time-divisionally selects A and scans each electrode of one electrode group, for example, the column electrode group, and scans each electrode of the other electrode group, for example, the row electrode group. By selectively controlling the electrodes according to the input ID while maintaining synchronization with the scanning, the entire optical image corresponding to the input signal can be displayed on the display panel surface. In an external electrode type display panel, it is necessary to drive it with an AC voltage, and the drive signal applied to the row electrode group and column electrode group includes a high frequency pulse called a toggle pulse.

If you turn on the display panel of the upper NQ after it has been left unlit for a long period of time without discharging and emitting light, the gas in the display panel is hardly ionized, so it will not be excited and the signal will not be applied. After that, it takes time to start leaving the device unattended, which has the drawback of shortening the so-called turn-on time.

Furthermore, even when the non-selected intersection of the display panel is in the 'yrfc' state, there is a drawback that the turn-on time continues.

In order to eliminate all of these drawbacks, all the IJ intersections of the plasma display panel are set to a selected state only once per period in which the column electrodes or row electrodes are scanned, regardless of the input signal, and these A method has been proposed in which the matrix intersection points are momentarily illuminated to hasten the turn-on time. (Japanese Patent Application No. 54-161967) In such a system, when all the row and column electrodes are selected regardless of the input signal, these selection signals and the high-frequency discharge pulse in the drive signal are generally asynchronous, and the selection signal has priority.

Therefore, regardless of the potential state of the high-frequency discharge pulse in the drive signal, if the selection signal is input, the high-frequency discharge pulse is fixed at the "high" or 6-low level. Considering these electrodes, if the selection number 100 is input, the high frequency discharge pulse at that time is fixed to 1". On the other hand, the row electrodes form cells with the opposing column electrodes in the display panel, and these cells act as capacitive loads, so when the display panel is discharged with a high-frequency discharge pulse to emit light, A discharge current flows when the state of electrical connection changes twice in cycles. In such a state, if selection 1g is input that fixes the high frequency discharge voltage to all "high", the above discharge 'tk flow will merge when rising to "city" in the 6th low 2nd period. Although it is an OT function, the above-mentioned discharge current cannot flow sufficiently during the 1-high period, and a potential drop sound occurs during the ``sieve'' period. It had the disadvantage that it was impossible to momentarily light up all the matrix intersections of the display panel.

SUMMARY OF THE INVENTION The object of the present invention is to provide a five-drive type that improves the above-mentioned drawbacks.

That is, according to the present invention, the column electrode group and the row 'tL electrode group are provided so as to face each other at a predetermined distance with a dielectric layer in between, and the discharge is filled with an ionizable gas. Display panel (I) One of the row and column electrode groups is sequentially scanned in a time-division manner, the other electrode group is selectively controlled by an input signal corresponding to the scan, and a high-frequency discharge pulse is applied between the selected row and column electrodes. A means for applying a first drive signal containing a first drive signal to cause one discharge light to be emitted at the matrix intersection of the corresponding two electrodes, and corresponding to scanning, all row and row electrodes are instantaneously selected irrespective of the input signal, and a first drive signal is applied between the selected row and row electrodes. 2 of 1
It is characterized by having means for applying a drive signal to momentarily cause the matrix intersections of the corresponding row and column electrodes to emit one discharge, and means for synchronizing the second drive (i) with the high-frequency discharge pulse in the first drive signal. A driving method for a discharge display panel is obtained.

Next, an embodiment of the present invention will be described with reference to the N side.

FIG. 1 is a block diagram showing an example of an l driving method of a plasma display panel according to FIG.

Input signal 1 is sent to pulse controller 1 in data controller 2Vc.
The waveform is shaped by the control pulse 21 obtained from 1 and applied to the row driver 3, where it is mixed with the retouch pulse obtained from the toggle pulse generator 7, and then applied to the drive voltage of the display panel 4. The voltage is stepped up and applied to each corresponding electrode of the row electrode group.

On the other hand, the clock pulse 13 from the pulse generator 8 is converted by the encoder 12 into a binary number pit corresponding to the number of electrodes in the column electrode group. Bit 1 from encoder 12
The number is decoded into a decimal number by the decoder 10,
Pulses equal to the number of electrodes in the column electrode group 6 are generated sequentially, and further, the waveform is shaped by the control noculus 21, and all of the toggle pulses are mixed at 'fc back column dryno (-9) to reach a drive voltage of display no<neA/4.
The column drive becomes No. 23 after being bumped up, and each electrode in the 1st column electrode group 6 is sequentially moved? 'KA selection, scan. Row electrode group 5
The selection is based on the input signal 1 and the scanning of the column electrode group 6 and 71.
Therefore, the entire optical image corresponding to the input signal 1 can be displayed on the display channel 4.

In this embodiment, control from the pulse indexing section 11) sets all the row and column electrode groups to the full-width selection state only once per cycle in which the column electrode groups are scanned by the control of the pulse indexing section 11. By synchronizing with the high frequency discharge pulse generated by the toggle pulse generator 7 under the control of the control node 21, all the IJs of the display panel 4 are controlled.
The intersection of the two electrodes is illuminated to ensure ionization of the gas in the valley between both electrode groups, thereby shortening the turn-on time.

FIG. 2 is similar to FIG. 1. FIG. 3 is a block diagram showing the details of the control operation by the control pulse 21, and FIG. 3 shows the voltage waveform at the trough for fully explaining the present invention.

First, in FIGS. 2 and 3, a reset pulse 31 having a period equal to the refresh period T of the column electrode group 6 is waveform-shaped in the pulse controller 11 and controlled to have a period T and a pulse width equal to the period t of the clock pulse 13. pulse 2
Get 1. The control pulse 21 is input to the toggle signal generator 14 and controls the generation of toggle signals in a synchronized manner. The controlled toggle signal is input to the base of the transistor T'rt, and its collector output is further input to the pace of the transistor Tr2 to generate a high frequency discharge pulse. When the hit toggle signal is I (high), transistor l1lr□ is on, so transistor Tr2
is turned off, and the driving voltage vo becomes atmospheric.

Next, when the toggle signal is LOW, all h column 1
h, the poles of the transistors Trt' and Tr2 are off and on, respectively, and the drive voltage Vo is the transistor T r
2* diode D1 and a second drive voltage vO' (2Vo) is obtained at its output. As shown in FIG. 3(b) Ic, the toggle No. 1B generated by the toggle signal generator is generated so as to rise in synchronization with the rising edge of the control pulse 21.

On the other hand, the input signal 1 that has passed through the data control section 2 is connected to the control 1 pulse 21 (or game) 32 r+ with one of the gates connected to the control 1 pulse 21.
+ is input to the row driver 3 together with the negative frequency emission pulse, and the output of the 11 drive 1g 22 as shown in FIG. 3(d) is obtained. Now IlN simply drive 4
It is assumed that all N numbers 22 have the same waveform.

On the other hand, the pulse from the decoder 10 passes through the NOR gate 33, one of whose gates is connected to the control unit pulse 21, and is input to the column driver 9 along with the high-frequency discharge pulse, and its output is shown in FIGS. 3(e), (f), ( A column drive signal 23 as shown in g) is obtained.

A composite signal p of the row drive signal 22 and column drive signal 23b is as shown in FIG. 3(h), and this composite signal p is applied to the display panel 4 between the row and column electrode groups 5 and 6. When the composite signal p is selected by the input signal 1 and scanning, a first driving voltage (2) is applied between the selected row and column electrodes 5, 6, which is slightly higher than the discharge start voltage of the display panel. A driving signal is applied to cause the matrix intersection corresponding to the input signal 1 to emit zero discharge.

Furthermore, the composite signal p is τ! , τ3, all matrix electrodes 5 and 6 are selected regardless of the input signal 1, and a drive signal having a drive voltage (Vo) is applied between both electrodes, and all matrix intersections of the display panel 4 are completely reliably selected. A discharge 9 is emitted. At this time, since the control pulse 21 and the high-frequency discharge pulse are rotated at the rising timing of both, τ1 due to the flow of the discharge current. Since no potential drop occurs during the τ2 period, all the IJ intersections can be reliably discharged and emitted light. Display panel 4 discharge '1 (i currents remain in opposite directions during periods τ11 and τ), and this discharge is usually referred to as a pair of discharges.

As described above, regardless of the input signal 1, all matrix intersections of the display panel 4 are brought into the selected state and discharge is performed once every period T, so there is no turn-on delay.

Also, even if the display panel is left unlit for a long time M and then is driven again, all matrix intersections become selected at regular intervals, so the probability of ionization of the gas interposed between the matrix electrodes increases. It can be easily turned on in a short period of time.

All of the above matrix intersection points are discharged only once in the T period, and on the other hand, there are n discharges in the T period due to the matrix drive signal corresponding to the normal input signal, including n toggle pulses, and the contrast ratio of the brightness of both is 1. :2n Totoru. Usually, n is 20 or more, and the contrast ratio is 1:40 or less, which provides a practically sufficient display.

When n is small, the turn-on delay can be improved without deteriorating the display quality by correspondingly increasing the discharge period of all the matrix intersections.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing the control operation of the control pulse shown in FIG. 1.
FIG. 3 is a waveform diagram showing voltage waveforms at various parts in an embodiment of the present invention. Reference numbers are given as follows. 1...Input signal, 2...Data control section, 3...Row driver? -A, 4...display panel, 5...row electrode group, 6...
・Column 'l! Pole group, 7... Toggle pulse generator,
8... Clock pulse generator, 9...
Column driver, 10... Tecoder, 11...
...Pulse control filS% 12... Encoder, 13... Clock pulse % 14...
... Toggle signal generator, 21 ... Control pulse, 2
2... Row drive signal, 23... Column drive signal, 31... Reset pulse, 32...
...Or Gate, :13 ・-=...Noah Gate.

Claims (1)

[Claims] Row? ! The electrode group and the column electrode group of a discharge display panel are arranged such that the row electrode group and the row electrode group face each other at a predetermined distance with a dielectric layer interposed therebetween, and the space is filled with an ionizable gas. One electrode group is sequentially scanned in a time-division manner, the other electrode group is selectively controlled by an input signal corresponding to the scanning, and a first drive signal including a high-frequency discharge pulse is applied between the selected row and column electrodes. , a means for discharging and emitting light at the matrix intersections of the corresponding two electrodes, and a second drive No. 11 is applied between the selected matrix electrodes to instantaneously set all the matrix electrodes to a selected state regardless of the input signal in correspondence with the scanning. , momentarily discharge the matrix intersection of the corresponding matrix electrodes,
A method for driving a discharge display panel, comprising means for emitting light and means for synchronizing the second drive signal with a high-frequency discharge pulse in the first drive signal.