JP2743669B2 - Driving method of plasma display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving an AC (AC) refresh type plasma display.

[0002]

2. Description of the Related Art A plasma display panel has a glass plate on which a plurality of scanning electrodes are arranged in parallel with each other and is covered with a dielectric, and a plurality of data-side electrodes are arranged in parallel with each other and is covered with a dielectric. The scanning electrode and the data-side electrode are disposed so as to face each other so as to be orthogonal to each other in a plan view. The intersection of the scan electrode and the data electrode in a plan view is a display cell, and a predetermined signal is supplied to the scan electrode and the data electrode to generate a discharge between the scan electrode and the data electrode. Thus, each display cell can be turned on.

FIG. 3 shows a conventional phase select type A
FIG. 4 is a timing chart showing a driving method of a C refresh type plasma display. The symbol A ₂ is the k-th
Signal supplied to the scan electrode lines (hereinafter, the scanning of the electrode signal), and reference numeral B ₂ are selected column signals to the data side electrodes (first p columns) (hereinafter, referred to as the data side electrode signal), and code C ₂ is the signal supplied to the data side electrodes of non-selected columns (first column q). Further, reference symbol a indicates an address period, reference symbol b indicates a hold period, reference symbol c indicates an auxiliary pulse period, and reference symbol e.
Denotes one scanning period, and symbol d denotes a display pulse period.

[0004] sequentially supplies the scan electrode signal A ₂ to the plurality of scan electrodes. The scan electrode signal A ₂ is 1 scanning period, and time-divided into an address period a, the hold period b and the auxiliary pulse period c, 3 pieces larger address pulse the address period a in relatively pulse width of a plurality (Fig. ), A plurality of hold pulses having a relatively small pulse width are provided in the hold period b, and one auxiliary pulse is provided in the auxiliary pulse period c.

On the other hand, a data-side electrode signal B ₂ is supplied to the selected column. The data-side electrode signal B ₂ gives a pulse having a phase opposite to that of the address pulse and the auxiliary pulse during the address period a and the auxiliary pulse period c. Thus, as shown in reference numeral D _2, in the selected cell (k, p), a pulse is given amplitude is large in the address period a, the cell is turned discharge occurs. Once a discharge occurs, the discharge continues even with a hold pulse having a small amplitude, and the cell is turned on until the hold pulse is no longer applied. Thereafter, in the auxiliary pulse period c, discharge is generated only once by one auxiliary pulse, and one scanning period ends.

[0006] In addition, the data-side electrode signal C ₂
Supply. The data-side electrode signal C ₂ gives the phase of the pulse for the address pulses in the address period a, is intended to provide a pulse of opposite phase to the auxiliary pulse to the auxiliary pulse. Thus, as shown by reference numeral E _2, the amplitude of the signal applied to the non-selected cells in the address period a (k, q) is reduced, the discharge is not generated in the non-selected cell,
It goes into a non-lighting state. Thereafter, discharge occurs only once in the auxiliary pulse period c.

In this method, the luminance of the selected cell changes substantially in proportion to the total number of pulses in one scanning period e.

[0008]

However, the driving method of the conventional plasma display has the following problems. That is, in the conventional driving method, the luminance of the selected cell changes substantially in proportion to the total number of pulses in one scanning period e, but the luminance of the non-selected cell is one pulse of the auxiliary pulse and is always constant. . Therefore, when the number of pulses in the display pulse period d is large (that is, when high luminance is set),
The contrast ratio between the selected cell and the non-selected cell becomes excessively high, and it becomes easy to feel glare and afterglow. When the number of pulses in the display pulse period d is small (that is, at the time of setting the low luminance), the contrast ratio between the selected cell and the non-selected cell becomes too low, and the luminance of the non-selected cell becomes conspicuous.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and can prevent glare and afterglow at the time of setting a high luminance, and can prevent a decrease in contrast ratio at the time of setting a low luminance. An object of the present invention is to provide an excellent plasma display driving method.

[0010]

According to a method of driving a plasma display according to the present invention, one scanning period includes an address period in which an address pulse is applied to generate a discharge in a selected cell of a plasma display panel, and a discharge in the selected cell. Time division into a hold period in which a hold pulse is applied to maintain the duration and an auxiliary pulse period in which an auxiliary pulse is applied to generate a discharge even in a non-selected cell, and the total number of the address pulse and the hold pulse is changed. In the plasma display driving method for changing the brightness of the selected cell, the number of the auxiliary pulses is changed according to the total number of the address pulses and the hold pulses.

[0011]

According to the present invention, the number of auxiliary pulses applied during the auxiliary pulse period is changed according to the total number of address pulses and hold pulses. That is, at the time of high luminance setting in which the total number of pulses of the address pulse and the hold pulse is large, the contrast ratio between the selected cell and the non-selected cell is suppressed by increasing the number of auxiliary pulses to reduce glare and afterglow. To avoid. In addition, at the time of low luminance setting where the total number of pulses of the address pulse and the hold pulse is small,
For example, by setting the number of auxiliary pulses to one, a decrease in the contrast ratio is avoided. Thereby, the visibility of the plasma display can be improved.

[0012]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a timing chart showing a driving method of a plasma display according to a first embodiment of the present invention. The plasma display panel includes a glass plate in which a plurality of scanning electrodes are arranged in parallel with each other and coated with a dielectric, and a glass plate in which a plurality of data-side electrodes are arranged in parallel with each other and coated with a dielectric. Are arranged so that the scanning electrode and the data-side electrode face each other so as to be orthogonal to each other in a plan view.

In FIG. 1, reference numeral A ₁ denotes a scan electrode signal supplied to the k-th scan electrode when high luminance is set, and reference numeral B ₁ denotes a data-side electrode signal supplied to the selected column (p-th column). , codes C ₁ is a data-side electrode signal supplied to the non-selected columns (first column q). Further, reference numeral D ₁ is the signal supplied to the scan electrode during the low brightness setting, reference numeral G ₁₁ is a data-side electrode signal supplied to the selected column, reference numeral G ₁₂ in the data-side electrode signal supplied to the non-selected column is there.

The present embodiment differs from the prior art in that the number of auxiliary pulses is changed between when high luminance is set and when low luminance is set. That is, in the present embodiment, at the time of high luminance setting in which the number of pulses in the display pulse period d is large, two auxiliary pulses are given in the auxiliary pulse period c. Accordingly, two pulses having phases opposite to those of the auxiliary pulse are applied to the selected cell column and the non-selected cell column in the auxiliary pulse period c.
Therefore, in the present embodiment, the contrast ratio between the selected cell and the non-selected cell at the time of setting the high luminance is reduced as compared with the related art, and the glare and the afterimage are suppressed.

On the other hand, when the number of hold pulses is low, which is あ る that of the high luminance setting, the number of auxiliary pulses is one.
One. For this reason, it is possible to prevent a decrease in the contrast ratio when the low luminance is set.

In the method of this embodiment, as described above, the number of auxiliary pulses is changed between when setting the high luminance and when setting the low luminance. It is possible to suppress a decrease in the contrast ratio when setting the luminance. Therefore, the visibility of the plasma display is improved as compared with the related art.

FIG. 2 is a timing chart showing a driving method of a plasma display according to a second embodiment of the present invention.

[0019] In FIG. 2, reference numeral E ₁ is a scanning electrode signal supplied to the scan electrode during a high brightness setting, reference numeral H ₁₁ data electrode side signal supplied to the selected column, code H ₁₂ is supplied to the non-selected column This is a data electrode side signal. Further, reference numeral F ₁ is a scanning electrode signal supplied to the scan electrode during the low brightness setting, reference numeral I ₁₁ is the data electrode side signal supplied to the selected column, reference numeral I ₁₂ is the data electrode side signal supplied to the non-selected column is there.

The present embodiment differs from the first embodiment in that the number of auxiliary pulses is changed for each frame when low luminance is set. That is, at the time of setting the high luminance, two auxiliary pulses are given for each frame, as in the first embodiment. However, at the time of low brightness setting, 1
The number of auxiliary pulses is changed for each frame. That is, in the odd-numbered frame, the number of auxiliary pulses is set to two,
In the even-numbered frame, the number of auxiliary pulses is one. Therefore, the average number of auxiliary pulses in one scanning period at the time of setting the low luminance is 1.5 pulses.

Also in this embodiment, the same effect as in the first embodiment can be obtained because the number of auxiliary pulses per scanning period is changed according to the total number of address pulses and auxiliary pulses during one scanning period. And the contrast ratio can be more finely adjusted.

[0022]

As described above, according to the present invention, 1
Since the number of auxiliary pulses is changed according to the total number of address pulses and hold pulses during the scanning period, glare and afterglow at the time of setting high luminance can be avoided, and
It is possible to avoid a decrease in the contrast ratio at the time of setting the low luminance. Thereby, there is an effect that the visibility of the plasma display is improved.

[Brief description of the drawings]

FIG. 1 is a timing chart showing a driving method of a plasma display according to a first embodiment of the present invention.

FIG. 2 is a timing chart illustrating a driving method of a plasma display according to a second embodiment of the present invention.

FIG. 3 is a timing chart showing a driving method of a conventional phase select type AC refresh type plasma display.

[Explanation of symbols]

 a; address period b; hold period c; auxiliary pulse period d; display pulse period e; one scanning period

Claims (1)

(57) [Claims] 1. One scanning period includes an address period in which an address pulse is applied to generate a discharge in a selected cell of a plasma display panel, a hold period in which a hold pulse is applied in order to sustain a discharge in the selected cell, and an unselected cell. In the method of driving a plasma display, the luminance of the selected cell is changed by changing the total number of the address pulse and the hold pulse by time-division with an auxiliary pulse period of providing an auxiliary pulse to generate a discharge. A method of driving a plasma display, wherein the number of the auxiliary pulses is changed according to the total number of the address pulses and the hold pulses.