JPS6244277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving an external electrode type discharge display panel (so-called plasma 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 row electrode groups parallel to each other are arranged in a matrix. A method is generally known in which an ionizable gas is interposed between a group of electrodes, and the intersection of a selected row electrode and a selected column electrode is displayed by discharge light emission.

In the display panel, an optical image corresponding to the input signal can be displayed by controlling the electrode selection method of the row electrode group and the column electrode group in accordance with the input signal. For example, each electrode of one of the row electrode group, column electrode group, and column electrode group, for example, each electrode of the column electrode group, is sequentially selected in a time-sharing manner;
An optical image corresponding to the input signal is displayed on the display panel surface by scanning and selectively controlling each electrode of the other electrode group, for example, the row electrode group, according to the input signal while maintaining synchronization with the scanning. can do. An external electrode type display panel needs to be driven by 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.

After the above display panel is left unlit for a long period of time without discharging and emitting light,
When lighting this, the gas in the display panel is hardly ionized, so it is difficult to be excited, and it takes time to start the discharge after the signal is applied, which has the disadvantage that the so-called turn-on time becomes long.

Furthermore, when a non-selected intersection of the display panel is newly brought into a selected state, the turn-on time similarly becomes longer.

To eliminate these drawbacks, all matrix intersections of a plasma display panel are scanned only once every other period or more than the period in which the column or row electrodes are scanned, regardless of the input signal. A method has been proposed in which a selected state is set and these matrix intersection points are momentarily lit to hasten the turn-on time.

However, when all the matrix intersections of the display panel are turned on at the same time, the load becomes extremely large, so the capacity of the driver must be increased, and the cost also increases.

The present invention improves these drawbacks by dividing the matrix intersections into unit blocks and lighting all the matrix intersections in each unit block for a moment, thereby reducing the increase in the driver's load. This speeds up the turn-on time.

The details of the present invention will be explained below with reference to Examples.

FIG. 1 is a block diagram showing an embodiment of a method for driving a plasma display panel according to the present invention.

The input signal 1 is applied to the trailing driver 3 whose output is controlled by the control pulse 21 obtained from the pulse control section 11 in the data control section 2, and is mixed with the toggle pulse obtained from the toggle pulse generator 7 in the row driver 3. Thereafter, the voltage is stepped up to the drive voltage of the display panel 4 and applied to each corresponding electrode of the row electrode group 5.

On the other hand, clock pulse 1 from pulse generator 8
3 is converted by the encoder 12 into binary bits corresponding to the number of electrodes in the column electrode group. The bit signal from the encoder 12 is sent to the decoder 10.
It is decoded into a decimal number and sequentially generates pulses equal to the number of electrodes in the column electrode group 6, and is further stepped up to the drive voltage of the display panel 4 by mixing toggle pulses in the rear row driver 9 whose output is controlled by the scan control 14. The column drive signal 23 is used to sequentially select and scan each electrode of the column electrode group 6. Since the selection of the row electrode group 5 corresponds to the input signal 1 and the scanning of the column electrode group 6, an optical image corresponding to the input signal 1 can be displayed on the display panel 4.

In this embodiment, the column electrode group 6 is divided into unit blocks, and once during the period in which the column electrodes 6 in the unit block are scanned, the control pulses from the pulse controller 11 are used to divide the column electrodes 6 in the corresponding unit block. All the column electrode groups 5 and the row electrode groups are brought into a selected state, and their matrix intersections are turned on momentarily to ensure the ionization of the gas interposed between both electrode groups, thereby shortening the turn-on time.

2 and 3 are detailed block diagrams of the data control section 2 and scan control section 14 in FIG. 1, and FIG. 4 is a voltage waveform diagram of each section for explaining the present invention.

In FIGS. 2, 3, and 4, the control pulse 21 is obtained by dividing a clock pulse having a period τ by six, and has a pulse width τ and a period T (6τ). That is, in the embodiment, a unit block is formed by five column electrode groups, and all of these five column electrode groups and row electrode groups are set to a selected state once, for example, in a period of τ ₁ , and all of these matrices are After lighting the intersection, the five column electrodes in the unit block are scanned by normal scanning during the following five clock periods. A step-by-step explanation will be given below.

In the data control section 2, the input signal 1 is input to an OR gate 2, one of the gates of which is connected to the control pulse 21.
4, the signal is input to the row driver 3 together with the toggle pulse, and a row drive signal 22 as shown in FIG. 4C is obtained at its output. To simplify the explanation, it is assumed that all row drive signals 22 are the same.

On the other hand, the pulses from the decoder 10 are input to the column driver 9 along with toggle pulses through the NOR gate 25, one of whose gates is connected to the second decoder 26, and the column drive signal 23 as shown in FIG. 4 d to i is input to the output thereof. obtain. Row drive signal 22
The composite signal P of the column drive signal 23 and column drive signal 23 is shown in FIG.
k, l, m, and this composite signal P is applied between the row and column electrode groups 5 and 6 of the display panel 4. That is, the matrix intersection of the first unit block is input in the period τ ₁ , the matrix intersection of the second unit block is input in the period τ ₂ , and similarly, the matrix intersection of the nth unit block is input in the period τ _o. Regardless of the signal, the voltage becomes higher than the discharge start voltage of the display panel, causing discharge and light emission. The discharge currents of the display panel 4 are in opposite directions when τ rises and falls, but these discharges are usually referred to as a pair of discharges. As described above, each group of five column electrodes is divided into unit blocks, and all matrix intersections in each unit block are τ
₁ , τ ₂ .... τ _o because it enters the selected state and emits light regardless of the input signal, so the matrix driver will not be overloaded and the turn-on delay of the display panel can be improved. . In the present invention, the matrix intersections of five column electrodes and all row electrodes are explained as a unit block, but the matrix intersections in a unit block can be increased or decreased depending on the load of the display panel and the load capacity of the matrix driver. Of course, the same effect can be obtained even if

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining one embodiment of the present invention, FIGS. 2 and 3 are detailed block diagrams of the data control section and scan control section in FIG. 1, respectively, and FIGS. It is a voltage waveform diagram of each part for explaining the present invention. In the figure, 1... input signal, 2... data control unit, 3... row driver, 4... display panel, 5... row electrode group, 6... column electrode group, 7...
Toggle pulse generator, 8...Pulse generator, 9...
... Column driver, 10 ... Decoder, 11 ... Pulse control section, 12 ... Encoder, 13 ... Clock pulse, 14 ... Scanning control section, 21 ... Control pulse, 22 ... Row drive signal, 23 ... Column Drive signal, 24...OR gate, 25...NOR gate, 26...second decoder, respectively.

Claims (1)

[Claims] 1 A group of parallel column electrodes whose surfaces are covered with a dielectric layer are formed on the first insulating substrate,
A group of parallel row electrodes whose surfaces are covered with a dielectric layer are formed on the second insulating substrate.
and a second insulating substrate, with the respective dielectric layers inside, the column electrode groups and the row electrode groups are arranged at predetermined intervals to form matrix intersections, and the periphery is hermetically sealed. One of the row or column electrode groups of an external electrode type discharge display board whose interior is filled with ionizable gas is sequentially scanned in a time-division manner, and the other electrode group is scanned in synchronization with this. In a time-division driving method for an external electrode type discharge display panel that displays an optical image corresponding to an input signal by selectively controlling the A time division driving method for an external electrode type discharge display panel, characterized in that all matrix intersection points within a block are instantaneously selected and emitted by discharge, independently of an input signal.