JP2751266B2 - Driving method of plasma display - Google Patents

Description

The present invention relates to a driving method of a plasma display,
Especially, AC refresh type plasma display (PDP)
In the driving method of

[Conventional technology]

Conventionally, as a driving method of this type of AC refresh type plasma display (PDP), a voltage waveform applied to one of an external electrode group facing each other via an insulator and a discharge space is time-divided. Pulsed,
To the other electrode group, a stable operation is performed by applying a pulse voltage of the opposite phase when lighting the voltage waveform applied to the one electrode group, and applying the same phase voltage when not lighting the voltage. This is shown in JP-B-55-48318. This driving method is generally called a phase select method.

A driving method that improves this phase select method is disclosed in
63-27893. This improved driving method includes a period (address period) in which a waveform of a voltage applied to a row electrode and a waveform voltage having an anti-homologous phase are applied to a column electrode according to the presence or absence of a display, as in the conventional phase selection method. One scan period includes a period (hold period) in which an address state in which a voltage having no relation to the waveform of the voltage applied to the row electrode is applied to the column electrode is maintained. The power consumed during the same voltage application period is the same as the conventional phase select method,
A voltage completely unrelated to the waveform of the voltage applied to the row electrode,
That is, since the power consumed during the period when the DC voltage is applied to the column electrodes is such that the power consumed between the column electrodes is negligible, the power consumption can be reduced after all.

FIG. 2 shows a timing chart of the voltage arrangement of this conventional driving method. FIG. 2A shows a pulse-like voltage applied to the L-th row of the plasma display. The address period a and the hold period b in one scanning period H are shown.
And the potential difference is the same. FIG. 2B and FIG. 2C show voltage waveforms applied to the m-th column (lit) and the n-th column (unlit). A pulse-like voltage is applied during the address period, but a DC voltage is applied during the hold period. Applied. FIG. 2D is a pulse voltage applied to the (L row, m column) lighting cells, and FIG. 2E is a pulse voltage applied to the (L row, n column) lighting cells. is there. As described above, in the conventional method, the voltage applied to the row electrode serving as the scanning electrode has the same magnitude (V _H = V _O ) in the address period and the hold period.

[Problems to be solved by the invention]

In the above-described conventional driving method, since the potential difference of the pulse voltage applied to the scan electrode is the same in the address period and the hold period in one scanning period, when the pulse voltage in the address period that determines whether to turn on or off is increased. However, the pulse voltage in the hold period for maintaining the discharge also increases, and there is a disadvantage that the non-selected dots that should not be turned on start discharging by the pulse voltage in the hold period.

Further, as is well known, in the AC refresh type driving method, since the brightness increases as the number of discharge pulses during one scanning period increases, the frequency of the pulse-like voltage applied to the scanning electrodes during the holding period is changed during the address period. It is usually higher than that of. However, if the hold period is shortened and the address period is lengthened so as to avoid the start of discharge of the non-selected dots due to the pulse voltage on the scanning side during the hold period, the number of discharge pulses is reduced for the above-described reason, resulting in a decrease in luminance. There were drawbacks.

An object of the present invention is to provide a driving method which eliminates the above-mentioned disadvantages of the driving method of the conventional AC refresh type plasma display.

[Means for solving the problem]

According to the present invention, a voltage is sequentially applied to one scanning electrode group of a plasma display panel in which electrodes are coated with a dielectric in a time-division manner, scanning is performed, and the scanning is performed in synchronization with the voltage applied to each scanning electrode. In a plasma display refresh driving method in which a voltage is applied to another data-side electrode group according to the presence or absence of data, a pulse applied to a scan electrode in an address period and a hold period in one scan period The potential difference between the pulse voltages is changed, and the pulse voltage applied during the hold period is lower than that applied during the address period.

〔Example〕

Next, a detailed description will be given with reference to the drawings. FIG. 1 is a timing chart of a voltage arrangement according to an embodiment of the present invention. The plasma display panel used in the driving method of the present invention includes two glass plates each having an electrode group covered with a dielectric, the electrode groups opposing each other, each of the electrode groups being orthogonal, and the intersection point indicating light emission for display. Designed to be a point.

In FIG. 1, 1-A is a pulse voltage applied to the scan electrodes in the L-th row, 1-B is a pulse voltage applied to the data electrodes in the m-th column, and 1-C is a data electrode in the n-th column. , 1-D is the state of the voltage applied to the (L row, m column) cell, and 1-E is the state of the voltage applied to the (L row, n column) cell. . H represents one scanning period, a represents an address period, and b represents a hold period.

The present embodiment differs from the conventional example shown in FIG. 2 only in the voltage applied to the scan electrodes during the hold period represented by _VH , and is otherwise the same.

Now, according to this embodiment, the value of V _H Whereas in the conventional driving method is a V _H = V _O, and has a V _H <V _O. The pulse voltage applied to the data electrode when the light is turned off is 1-C (corresponding to FIG. 2-C), and the pulse voltage 1-A applied to the scan electrode (see FIG. 2-A). The corresponding voltage waveform is 1-E (corresponding to 2-E in FIG. 2). this is,
This voltage is applied to the (L row, n column) cells to be turned off. When 1-E is compared with 2-E in FIG. 2, the address period is exactly the same, but is applied during the hold period. The voltage is lower in 1-E according to the present embodiment. Therefore, it is possible to avoid the start of the discharge of the non-selected dots due to only the pulse voltage in the hold period, and to stabilize the display operation.

Finally, the merit of increasing the potential difference of the pulse voltage applied to the scan electrode in the address period will be described below. First,
Potential V _{0 of the} pulsed voltage applied to the cells to be discharged to
+ V ₁ is large, so easy to discharge. Therefore, as the discharge current increases, the amount of light emitted per discharge also increases. That is, the brightness increases. On the other hand, boosting the voltage on the scanning side also means increasing the potential difference applied to the light-off cells in the address period. However, this effect can be sufficiently absorbed by increasing the voltage applied to the data side electrode. Further, the increase in the voltage on the data side also means the increase in the potential difference applied to the lighting cell. As a result, the voltage applied to each cell during the address period for determining whether to turn on or off can be sufficiently high at the time of lighting and sufficiently low at the time of turning off the light, and the number of address pulses can be reduced as compared with the related art.
Generally, the frequency of the pulse in the hold period is higher than that in the address period. Therefore, when the number of address pulses is reduced, the total number of pulses in the address and hold periods can be increased, and the luminance can be increased.

〔The invention's effect〕

As described above, according to the present invention, the display operation can be stabilized and the luminance can be increased by making the potential difference of the pulse voltage applied to the scan electrode during the hold period lower than that during the address period.

[Brief description of the drawings]

FIG. 1 is a timing chart of a voltage arrangement according to one embodiment of the present invention, and FIG. 2 is a timing chart of a voltage arrangement of a conventional driving method. 1-A, 2-A: pulse voltage applied to the scan electrodes in the L-th row, 1-B, 2-B: pulse voltage applied to data electrodes in the m-th column, 1-C, 2- C: pulse-like voltage applied to the data electrode in the n-th column, 1-D, 2-D ... (L row, m column) voltage applied to the cell, 1-E, 2-E ... (L row, n columns) voltage applied to the cell.

Claims (1)

(57) [Claims] 1. A voltage is sequentially applied to one scanning electrode group of a plasma display panel in which electrodes are coated with a dielectric in a time-division manner, and scanning is performed, and the voltage is synchronized with the voltage applied to each scanning electrode. Then, in the refresh driving method of the plasma display in which a voltage is applied to another data side electrode group in accordance with the presence or absence of data, a driving period and a holding state are displayed in an address state at least during one scanning period. Driving the plasma display, wherein the voltage applied to the scan electrodes during the hold state is lower than the voltage applied to the scan electrodes during the address state. Method.