JPH0648426B2 - Driving method for plasma display - Google Patents

Description

The present invention relates to a method of driving a plasma display, and more particularly, to an AC refresh type plasma display (PD).
P) driving method.

Conventionally, as a method of driving an AC refresh type plasma display (PDP) of this type, a voltage waveform applied to either one of an insulator and an external electrode group facing each other via a discharge space is time-divided. Applied to the other electrode group, a pulse voltage of opposite phase is applied to the other electrode group when lighting the voltage waveform applied to the one electrode group, and a DC voltage is applied to the other electrode group when not lighting. It is generally known that stable operation is exhibited by doing.

In the conventional driving method described above, the power consumption of the driving circuit is maximized when a pulse voltage having an opposite phase corresponding to lighting is applied to all the data-side electrode groups. Further, the brightness of the AC refresh PDP is determined by the number of pulses included in a unit time, but if the number of pulses is increased, the power consumption of the drive circuit increases, so that the drive frequency is limited and sufficient brightness is obtained. There was a drawback that was difficult.

On the other hand, if there is a temporal shift between the high frequency pulses applied to the scan electrode group and the data electrode group, there is a drawback that the drive voltage range is narrowed.

Furthermore, when a transparent electrode is used for the data side electrode, a distributed constant circuit is formed by the stray capacitance between this transparent electrode and the electrode, and the output of the drive circuit and the waveform at the tip of the transparent electrode are formed. , And the voltage are different, there is a drawback that uneven brightness occurs.

The present invention provides a driving method which eliminates the above-mentioned drawbacks of the conventional AC refresh type plasma display driving method.

That is, depending on the presence / absence of display, a pulse voltage having a phase opposite to that of the waveform of the voltage applied to the row electrodes, as in the conventional driving method, or
One scanning period includes a period in which the DC voltage is applied to the column electrodes and a period in which a voltage having no relationship with the waveform of the voltage applied to the row electrodes is applied to the column electrodes. The power consumed during the period when a similar voltage is applied is the same as that in the conventional driving method, but a voltage that has nothing to do with the waveform of the voltage applied to the row electrodes, that is, a DC voltage is applied to the column electrodes. The power consumed during a certain period is remarkably low because the power consumed between the column electrodes is negligible.

The driving method of the AC refresh type plasma display of the present invention is such that two glass plates each having an electrode group formed on a glass plate and the electrode group coated with a dielectric material are opposed to each other with the dielectric material facing each other and maintaining an appropriate interval. When a panel-shaped voltage is applied between the electrodes of a plasma display panel that has a structure in which neon gas is sealed inside and it is hermetically sealed with glass frit, only one electrode is applied. When a panel voltage is applied to maintain the other electrode at 0 potential and a discharge is generated between the electrodes, the discharge voltage of one discharge cell in the plasma display panel is the minimum single discharge start voltage (VDmin), When the discharge voltage of all cells of the plasma display panel is defined as the maximum discharge start voltage (VDmax), one electrode of the plasma display, which is lower than VDmin, is used. Jo voltage (V0) in advance by applying a, to the other electrode, at the same time applying a pulse voltage of opposite phase (V1), VDmax <| V0 | + | V1 |
This is an improved method of driving by utilizing the fact that the discharge is started when the condition of is satisfied.

When a pulsed voltage that is higher than the maximum single discharge start voltage is applied to one electrode and a DC voltage is applied to the other electrode, all cells in the panel start to discharge, but the discharge is started after the voltage is applied. It takes a long time to start, and the discharge delay time in the AC refresh method is generally 5 microseconds or more, though it depends on the applied voltage. On the other hand, the response of the discharge after the discharge is started is very distant and is 100 nanoseconds or less.

The driving method of the AC refresh type plasma display of the present invention utilizes this discharge delay phenomenon. A pulsed voltage higher than the one-sided discharge starting voltage of one electrode is applied to display the same as the conventional driving method. According to the presence or absence, a DC voltage or a pulsed voltage of opposite phase is applied to the other electrode to discharge the discharge cells to be discharged, and then the pulsed voltage of the other electrode is removed to apply it to only one electrode. By maintaining the state with a pulsed voltage for one electrode and returning to a state similar to the conventional driving method before the non-lighted cell is lighted with the pulsed voltage of one electrode, the PD
This is a method of driving P.

That is, if the state of being driven by the conventional driving method is defined as the address state, and the state of maintaining the address state by applying the pulsed voltage to one electrode is defined as the hold state, the driving method of the present invention is It is characterized by alternately repeating the state and the hold state.

Next, a detailed description will be given with reference to the drawings.

FIG. 1 is a timing chart of voltage arrangement according to the first embodiment of the present invention. FIG. 2 is a timing chart for explaining the timing of the pulsed voltage applied to the scan electrodes.

The plasma display panel used in the driving method of the present invention comprises two glass plates each having an electrode group coated with a dielectric, the electrode groups being opposed to each other, the respective electrode groups being orthogonal to each other, and the intersection being a light emitting point of the display. Is designed to be.
In order to drive this plasma display panel, generally, the first electrode is selected only during the H period by the horizontal synchronizing signal shown in 2-E of FIG. 2 and the wave shown in 2-A of FIG. 2 is selected. A pulsed voltage with a high value V0 is applied to the first electrode. In the case of a panel having m horizontal electrodes and n vertical electrodes, n vertical electrodes are selected and driven with respect to the first horizontal electrode.

Next, after a certain period (blanking period), the second
Electrode is selected, and V0 is applied only during the H period like the first electrode.
A pulsed voltage having a peak value of is applied to the second electrode. (See FIG. 2B) The pulsed voltage is applied to the third electrode after the pulsed voltage is applied to the second electrode, and thereafter, this operation is sequentially repeated, and the vertical synchronization signal is transmitted. Time until entering (V)
Continue. The vertical synchronization signal shown in FIG. 2D returns the state in which the first electrode can be selected.

That is, the scanning of the method is sequentially scanned by the horizontal synchronizing signal, and is returned to the original state by the vertical synchronizing signal input after all the horizontal electrodes are scanned. The vertical sync signal matches the refresh frequency of the display, typically 60
Selected over cycles. On the other hand, the number of horizontal synchronizing signals included in one period of the vertical synchronizing signal matches the number of scanning lines,
Generally, the number of scan lines does not match the number of scan electrodes of the panel, and the number of scan lines is larger than the number of scan electrodes of the panel.

FIG. 1-A shows the pulsed voltage applied to the first row electrodes, and 1-B and 1-C in FIG. 1 are the m-th column and the n-th column, respectively.
It shows the pulsed voltage applied to the column electrodes.

1-C and 1-D in FIG. 1 are the first row electrode and the m-th electrode, respectively.
7 shows voltage waveforms applied to discharge light emitting point (1 row, m column) cells and (1 row, n column) cells formed at the intersections of the column electrodes and the nth column electrode.

Since the voltage waveform applied to the m-th column electrode has an opposite phase to the voltage waveform applied to the first-row electrode, (1 row, m
(Column) cell lighting mode.

On the other hand, since the voltage applied to the n-th column electrode is a DC voltage of 0 potential (1 row, n column), the cell is in the non-lighting mode,
That is, it is a light-off mode. The pulsed voltage applied to the (1st row, mth column) cell is represented by the potential difference between the pulsed voltage applied to the first row electrode and the mth column electrode, and has a waveform 1-D in FIG. . The pulse-like voltage applied to the cell (1 row, n columns) is also represented by the potential difference as shown in FIG. 1-E.

According to the driving method of the present invention, during the H period in which the row electrodes are selected, the pulse voltage or the DC voltage is applied to the column electrodes according to the presence or absence of the display, and the DC voltage is applied regardless of the display. It is different from the conventional driving method that the period b is set.

In the present invention, the period a in the H period is defined as an address state. On the other hand, the voltage applied to the lighted cell in the period b during the H period is exactly the same regardless of whether the cell is on or off as shown in FIGS. 1-D and 1-E in FIG. Define.

In the hold mode, a pulse voltage having an amplitude (V0) is applied regardless of whether the light is turned on or off as shown by the voltage waveforms in the period (a) of FIGS. 1-D and 1-E. In this state, the state created by the address state applied prior to the above is maintained for this period, and the display is performed.

That is, the cells in the (1 row, m column) which are in the lighting state in the address state are discharged during the period (a) and the inside of the cell is filled with the charged particles generated by the discharge, so that the voltage lower than that in the address state is generated. Even in the hold state where is applied, the discharge easily starts.

On the other hand, in the non-lighted state (1 row, n column) cells in the address state, it takes a certain period of time before the discharge is started by the voltage applied in the period a + b, and if the period (a + b) is appropriately selected. The voltage at which discharge does not start can be determined.

[Brief description of drawings]

FIG. 1 shows an applied voltage waveform according to an embodiment of the present invention. FIG. 1-A shows the pulse voltage applied to the scan electrodes of the first row, FIG. 1-B shows the m-th column data side electrode, and FIG. 1-C shows the n-th column data electrode. The respective pulse voltages are shown. 1-D and 1-E are (1 row, m column) (1
(Row, n column) shows the state of voltage applied to the cell. FIG. 2 shows the state of the pulsed voltage applied to the scan electrodes.

Claims (1)

[Claims] 1. A voltage is sequentially applied to one scanning electrode group of a plasma display panel whose electrodes are covered with a dielectric material in a time-division manner and scanning is performed, and the scanning electrodes are synchronized with the voltage applied to each scanning electrode. In the refresh driving method of the plasma display in which a voltage is applied to other data side electrode groups according to the presence or absence of data, a period for holding display in an address state and a hold state for at least one scanning period. A driving method of a plasma display, comprising: The address state and the hold state referred to here are defined as follows. That is, during one scanning period in which one scanning electrode is selected, the data-side electrode corresponding to the cell to be displayed has a pulsed voltage of the opposite phase synchronized with the pulsed voltage applied to the scanning electrode, It is created in the address state by stopping the address state and the pulse state voltage applied to the data side electrode while applying a DC voltage to the data side electrode corresponding to the cell that should not be displayed. The state during the period in which only the charged particles and the pulsed voltage applied to the scanning electrode are driven is defined as the hold state.