JPH04178687A - Driving method for plasma display - Google Patents

Abstract

PURPOSE:To realize a gradation display at every lighting cells by alternately setting a period that a voltage applied to a scanning electrode in a holding period and the period that the voltage applied to a data side electrode and stopping the voltage applied on a data side electrode according to the brightness selection of data. CONSTITUTION:Pulse-like voltages applied on a data electrode at the time of lighting are 1-B, 1-C, and 1-D, and synthetic voltage waveforms with a pulse- like voltage 1-A applied on the scanning electrode are 1-F, 1-G, and 1-H. On the other hand, a pulse-like voltage applied on the data electrode at the time of putting-off, is 1-E, and the synthetic waveform with 1-A is 1-I. Brightness at the time of the lighting can be switched in three steps, by operating the pulse-like voltages applied on the data electrode and stopping discharging in the middle of the holding period.

Description

DETAILED DESCRIPTION OF THE INVENTION ['Industrial Application Field] The present invention relates to a method for driving a plasma display, and in particular to an AC refresh type plasma display (PDP).
).

[Conventional technology]

Conventionally, as a driving method for this type of A or C refresh type plasma display (PDP), the voltage waveform applied to one of the external electrode groups facing each other through an insulator and a discharge space is It has a divided pulse shape, and the other electrode group applies a pulse voltage of the opposite phase to the voltage waveform applied to the one electrode group when lighting is to be performed, and applies a voltage of the same phase when not lighting. It was shown in 1984 that stable operation was achieved by
8318. This driving method is generally called a phase selection method.

A driving method that improved this phase selection method was published in JP-A No. 6.
3-27893. This improved driving method has a period (address period) in which waveform voltages with inverse phase and in-phase with the voltage waveform applied to the row electrodes are applied to the column electrodes, depending on the presence or absence of display, similar to the conventional phase selection method. The -scanning period includes a period during which the address state is maintained (hold period) in which a voltage completely unrelated to the waveform of the voltage applied to the row electrodes is applied to the column electrodes, which is different from the conventional phase selection method. The power consumed during the period when similar voltages are applied is the same as in the conventional phase selection method, but a voltage completely unrelated to the waveform of the voltage applied to the row electrodes, that is, a DC voltage is applied to the column electrodes. Since the power consumed during the period during which the rows xi are set is negligible, the power consumption can be reduced.

FIG. 2 shows a timing chart of the voltage arrangement of this conventional driving method. FIG. 2A shows a pulsed voltage applied to the second row of the plasma display, and during the scanning period H, a is the address period and b to f are the hold periods. Figure 2 2-B and 2-C are r-th
Regarding the voltage waveforms applied to the f1 column (lighted) and the ri column (unlit), a pulse voltage is applied during the address period, or a DC voltage is applied during the bold period. Figure 2 2 - Ri is the pulsed voltage applied to the lit cell in (L, row 1m column), and Figure 2 2 - E is the pulsed voltage applied to the unlit cell in (L row, n column). be.

[Problem to be solved by the invention]

In the conventional driving method described above, since lighting and extinguishing during the halt period are controlled by the address period, the lighting period during the bold period cannot be controlled for each lit cell.
It only had binary control (on or off), and could not support gradation display.

[Means to solve the problem]

In the present invention, a voltage is sequentially applied in a time-division manner to one scanning electrode group of a plasma display panel whose electrodes are covered with a dielectric material, and scanning is performed in advance in synchronization with the voltage applied to each scanning electrode. In a refresh drive method for a plasma display in which a voltage is applied to other data-side electrode groups according to the presence or absence of data, - a period during which a pulsed voltage is applied to the scan electrodes during a hold period within the scan period; Periods in which pulsed voltages are applied to the data side electrodes alternate, and the voltage applied to the data side electrodes is stopped according to the data brightness selection, thereby making it possible to display gradations for each lit cell. It is.

〔Example〕

Next, a detailed explanation will be given with reference to the drawings. FIG. 1 is a timing chart of voltage arrangement in an embodiment according to the present invention. The plasma display panel used in the driving method of the present invention consists of two glass plates each having electrode groups covered with a dielectric material, the electrode groups facing each other, the respective electrode groups intersecting each other at right angles, and the intersection point being the light emitting point for display. It is designed to be a point.

In FIG. 1, 1-A is a pulsed voltage applied to the scan electrode of the second row, 1-B is a pulsed voltage applied to the data electrode of the mth column, and l-C is the data of the nth column. A pulsed voltage applied to the electrodes, 1-E is a pulsed voltage applied to the data electrodes of the p-th column, 1-E is a pulsed voltage applied to the data electrodes of the 9th column, 1. -F is the state of the voltage applied to the cell (L row, 1m column), 1-G is the state of the voltage applied to the cell (L row, n column), l-H is the (L row, p column) cell 1-1 is the state of the voltage applied to the (L row, q column) cell.

Further, H represents one scanning period, a is an address period, and b~
f represents a hold period.

The difference between this embodiment and the conventional example shown in FIG. 2 is that during the hold periods C and e, the pulsed voltage applied to the scan electrodes in the second row is stopped, and instead, the pulse voltage applied to the scan electrodes in the m-th and n-th columns is This is the point where data is applied to the pole.

Now, according to this embodiment, the pulse voltage applied to the data electrode during lighting is 1. -B, 1-C, 1-D〈Figure 2 2
-B), and the combined voltage waveforms with the pulsed voltage 1-A (corresponding to Figure 2 1-A) applied to the scanning electrode are 1-F, l-G, 1-H (corresponding to 1-A in Figure 2). 2 (corresponding to Figure 2-D). Further, the pulse voltage applied to the data electrode when the light is turned off is 1-E (corresponding to FIG. 2-2-C), and 1. - The composite waveform with A is ]-■ (corresponding to Fig. 2-2-E).

(L, row 1m column) Cell (], -F) is a cell in which a discharge generated by a pulsed voltage with an amplitude of 2 o during the address period is applied alternately during each divided hold period b to f. It is maintained by the row pulsed voltage (1, -A, ) and the mth column pulsed voltage. On the other hand, (L, row, n column) cell (1-G) is the same as (I-row, 1m column) cell (1-F) until the hold period d, but the applied voltage is DC during period C. Therefore, the charges within the cell generated by the discharge up to period d are recombined, and the vehicle power discharge starting voltage increases. Therefore, by setting the e period appropriately,
The pulsed voltage of period f does not lead to re-discharge. At this time,
The brightness of the cell (row L, column n) is lower than that of the cell (row L, column 1m), which does not discharge during periods e to f. Similarly, by setting the C period appropriately for the cell (L row, 1p column),
Compared to the cell (L row, 1m column) in which discharge did not occur after period d, compared to the cell (L row, n column) that was discharged during period C to f,
The brightness decreases for periods C to d. Therefore, the brightness during lighting can be switched to three levels by manipulating the pulsed voltage applied to the data electrodes and stopping the discharge in the middle of the hold period.

〔Effect of the invention〕

As explained above, the present invention has two main features: a period in which a voltage is applied to the scan tai in the hold period, and a period in which a voltage is applied to the data side t8i.
By alternately setting the period during which voltage is applied to i and stopping the voltage applied to the data-side electrode according to the data brightness selection, gradation display for each lit cell can be realized.

[Brief explanation of drawings]

FIG. 1 is a timing chart of voltage arrangement according to an embodiment of the present invention, and FIG. 2 is a timing chart of voltage arrangement according to a conventional driving method. 1-A, 2-A... Pulse voltage applied to the scan electrode of the second row, 1-B, 2'-B... Pulse voltage applied to the data electrode of the m-th column, l -C, 2-C... Pulse voltage applied to data ti in the nth column, l-D.
... Pulse voltage applied to the data electrodes of the second column, 1
-E... Pulse voltage applied to the data electrode of the 9th column, 1-F, 2-D... (I- row. m column) Voltage applied to the cell, 1-G, 2- E...<
L row, n column> Voltage applied to the cell, l-H...(L
Row, n column) Voltage applied to the cell, ]-■...(L,
Row, q column) Voltage applied to the cell.

Claims (1)

[Claims] A voltage is sequentially applied in a time-division manner to one scanning electrode group of a plasma display panel whose electrodes are covered with a dielectric material, and the other scanning electrodes are scanned in synchronization with the voltage applied to each scanning electrode. In a refresh drive method for a plasma display in which a voltage is applied to the data-side electrode group according to the presence or absence of data, the display is performed in an address state and in a hold state during at least one scanning period. In addition, a period in which a voltage is applied to the scan electrode and a period in which a voltage is applied to the data side electrode alternately exist during the hold state, and the voltage is applied to the data side electrode according to the data brightness selection. A method for driving a plasma display characterized by stopping the.