JP2616663B2 - Driving method of plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called dot matrix type memory type AC plasma display panel used for personal computers and office workstations, which have been remarkably advanced in recent years, and wall-mounted televisions, which are expected to develop in the future. The present invention relates to a method for erasing a driving device.

[0002]

2. Description of the Related Art A conventional AC plasma display panel has a structure shown in FIG. In FIG. 5, (A) is a plan view, and (B) is an xx ′ cross-sectional view of (A). The plasma display panel includes a first insulating substrate 11 made of glass, a second insulating substrate 12 also made of glass, a row electrode 13, a column electrode 14, a discharge gas space 15 filled with a discharge gas such as He, Xe, or the like. A partition 16 for securing a gas space and separating pixels, a phosphor 1 for converting ultraviolet light generated by discharge of a discharge gas into visible light
7. Insulating layer 18a covering row electrodes, insulating layer 1 covering column electrodes
8b, a protective layer 19 made of MgO or the like for protecting the insulator from electric discharge. Note that in FIG.
Reference numeral 20 indicates a pixel. If the phosphors 17 are painted in three colors for each pixel, a plasma display capable of color display can be obtained.

[0003] Next, FIG. 6 shows only the electrodes of the plasma display panel. In FIG.
Is a plasma display panel, 22 is the first insulating substrate 1
A sealing portion for bonding the first and second insulating substrates 12 together, sealing a discharge gas therein and hermetically sealing them, _{Su 1} , _{Su 2,.}
.., S _um-1 , S _um are sustain electrodes, S _{c 1} ,
S _c2 ,..., S _{cm -1} and S _cm are scanning electrodes, and the row electrodes 13 are obtained by alternately combining these. Also, D
₁ , D ₂ ,..., D _n−1 , D _n indicate column electrodes.

FIG. 7 is a diagram showing an example of a driving voltage waveform and a light emission waveform of the plasma display panel shown in FIGS. In FIG. 7, a waveform (A) is a voltage waveform applied to sustain electrodes S _{u 1} , S _{u 2} ,..., S _um-1 , S _um , and a waveform (B) is applied to scan electrode S _{c 1} . voltage waveforms, waveform (C) is the voltage waveform applied to the scan electrode S _{c 2,} waveform (D), the scanning electrodes S _{cm -} voltage waveform applied to _1, waveform (E) is the scanning electrode S _cm the applied voltage waveform, waveform (F) is the voltage waveform applied to the column electrode D _j, waveform (G) is, light emission waveform of the pixel connected to the scan electrode S _{c 1,} waveform (H) is the scanning electrode S _cm 5 shows a light emission waveform of a connected pixel. Sustain electrodes _{Su 1} , _{Su 2} ,
, _Sum-1 and _Sum are applied with the sustain pulse 1. Further, the scanning electrodes S _{c 1} , S _{c 2} ,.
_{cm - 1} In, S _cm, are applied in addition to the sustain pulse 2 common to these electrodes, the erase Pasuru 4 and scan pulse 3 line-sequentially in a separate timing to each scanning electrode. If there is emission data, a data pulse 5 is applied to each column electrode Dj in synchronization with the scanning pulse 3.

In the plasma display panel having the structure shown in FIGS. 5 and 6, when a scan pulse and a data pulse are applied between the scan electrode and the column electrode at the same timing to cause a write discharge, the adjacent discharge is maintained thereafter. The sustain discharge is sustained between the electrode and the scan electrode by the sustain pulse 1 and the sustain pulse 2. Such a function is called a memory function. The erasing pulse applied to the scanning electrode is a narrow erasing pulse and a thick line erasing pulse as shown in FIG. 8 ("Plasma Display", edited by Kenichi Owaki and Yoshinori Yoshida, Kyoritsu Shuppan Co., Ltd .: November 15, 1983). It is described in the first edition, 1st edition, page 90).

[0006]

However, each of the erase pulses shown in FIG. 8 has a disadvantage. The narrow erase pulse 4a shown in FIG. 8A has a large erase operation margin for a fixed load, but is weak against fluctuations in pulse shape and voltage. For example, as the screen size increases, the number of cells to be erased changes greatly depending on the display image. Such a large load change greatly distorts the applied pulse waveform. In particular, a narrow erase pulse that needs to be applied with a controlled pulse width is easily affected by waveform distortion, and it has been difficult to uniformly erase a large screen panel regardless of the display screen state. The wide erase pulse 4b shown in FIG. 8 (b) weakens wall charges by generating a weak discharge with a wide applied pulse of a low voltage, so that the number of cells to be erased with a large screen is reduced. Less susceptible to fluctuations. However, since the wide erase pulse has a narrow erase operation margin, it is weak to the change in erase voltage due to the variation between cells in a large screen, and it has been difficult to operate within the erase operation margin.

[0007]

According to the present invention, in a method of driving a dot matrix display type AC plasma display panel having a memory function, an erasing pulse for terminating light emission is at least a first portion and a second portion. of
Part, wherein said first part is
A high-voltage pulse that causes a discharge across the cell
Start with a pulse voltage waveform that is narrow enough to
The second portion has a pulse waveform equal to or lower than the discharge sustaining voltage.
The first portion is wider than the first portion and has a lower voltage.
Thus, a method for driving a plasma display panel characterized by having a pulse voltage waveform is obtained. In addition, the second
The part has the same polarity as the first part and is equal to or lower than the discharge sustaining voltage.
After the pulse waveform, the discharge sustaining voltage is opposite in polarity to the first part.
It is characterized by having a pulse waveform of a pressure or less.

[0008]

FIG. 5 shows a plasma display panel according to the present invention.
The one shown in FIG. 6 was used, and He-Xe was used as the filling gas. In addition, the same driving waveform as that of the related art shown in FIG. 7 except for the erase pulse was used as the driving waveform.

FIG. 1 shows a first embodiment of an erase pulse according to the present invention. The erase pulse 7 is the first part 7 of the erase pulse.
a and the second portion 7b of the erase pulse. The first portion 7a of the erase pulse was set to a voltage (150 V) other than the voltage of the low voltage pulse 7b in order to ensure that all cells in the panel could start weak discharge. However, the pulse width is 100
Since it is as narrow as ~ 500 ns, wall charges are hardly formed.

After that, before the first portion 7a of the erase pulse returns to the reference potential, a voltage (100 V) equal to or lower than the sustaining voltage is applied.
Then, the second part 7 of the erase pulse having a pulse width of 3 μs
By applying b, the weakening of the wall charge and space charge was performed by the weak discharge to obtain an erase discharge. Regarding the pulse width of the second part of the erasing pulse shown here, an erasing margin was obtained at 300 ns or more, and it could be used for practical use.

As described above, by the driving method in which the first portion 7a of the erase pulse and the second portion 7b of the erase pulse are continuously applied, the first portion 7a of the erase pulse has the activity contributing to the discharge in all the cells. Many particles could be generated, and a weak discharge for erasing could be reliably generated by the second portion 7b of the erasing pulse. Therefore, the erasing operation margin has been greatly improved. Moreover, even in a large screen panel, the main erasing discharge is a kind of wide erasing by the second portion 7b of the erasing pulse, so that it is resistant to load fluctuation. As described above, a stable display image can be provided.

FIG. 2 shows a second embodiment of the erase pulse according to the present invention. As shown in FIG. 2, after the end of the first portion 8a of the erase pulse, a second portion 8b of the erase pulse having a polarity opposite to that of the first portion 8a was applied. As in the embodiment of FIG. 1, in the first portion 8a of the erase pulse, a large number of active particles contributing to the discharge can be generated in all the cells, and the second portion 8a of the erase pulse can be generated.
Since the weak discharge of b can be reliably generated, the erasing operation margin is greatly improved.

FIG. 3 shows a third embodiment of the erase pulse according to the present invention. First part 7 of erase pulse shown in FIG.
First, a first portion 9a of the same erasing pulse as that of a and a second portion 9b of the same erasing pulse as the second portion 7b of the erasing pulse are applied first. This is followed by a second part 9b of the erase pulse.
At the same time, the second portion 9c of the erase pulse constituting the second portion of the erase pulse was applied. The erasing pulse 9c had a voltage equal to or lower than the discharge starting voltage and had a pulse width of 300 ns. As described above, by combining a low-voltage pulse having a reverse polarity as the second part of the erase pulse, the charge that could not be erased in the second part 9b of the erase pulse is replaced by the second part of the erase pulse. By 9c, weak discharge was again carried out, and the body was weakened. As a result, the stability of the erasing operation margin is greatly increased even with a large load change, and a display image can be stably provided.

FIG. 4 shows a fourth embodiment of the erase pulse according to the present invention. FIG. 4 is different from the case of FIG. 1 and returns to the reference potential momentarily after the end of the first portion 10a of the erase pulse. Thereafter, the second part 10b of the erase pulse was applied while the active particles and space charge in the discharge by the first part 10a of the erase pulse depended. The erasing mechanism is the same as that of the first embodiment shown in FIG. As described above, if there is a trigger effect on the low voltage pulse of the second part of the erase pulse, the first part of the erase pulse which is always the trigger pulse and the second part of the erase pulse which is the low voltage erase pulse
May not be completely continuous.

In the above embodiment, the case where only one set of erase pulses is applied has been described, but a plurality of sets of erase pulses may be applied. As a result, the erasing operation margin for a large load change can be further expanded.

Further, in the above embodiment, an example was described in which the erase pulse of the present invention was applied to scan erasing. However, the present invention is not limited to this, and the erase pulse of the present invention is applicable to the case where the entire panel is simultaneously erased. Can also be applied.

In the above embodiment, the case where the AC surface discharge memory type plasma display panel having the structure shown in FIGS. 5 and 6 is driven has been described. However, the present invention is not limited to this. The present invention can be applied to any discharge type plasma display panel.

[0018]

As described above, when driving a memory type AC plasma display panel, the introduction of the first part of the erasing pulse of the present invention reliably generates a weak discharge which triggers an erasing discharge. The erasing operation can be reliably performed by the second portion of the erasing pulse. Therefore, even when the load fluctuates greatly, as in the case of displaying a moving image, the erasing operation can be performed stably over the entire surface of the panel, so that the display quality is significantly improved.

[Brief description of the drawings]

FIG. 1 is an erase pulse waveform showing a driving method according to a first embodiment of the present invention.

FIG. 2 is an erase pulse waveform showing a second embodiment of the driving method of the present invention.

FIG. 3 is an erase pulse waveform showing a third embodiment of the driving method according to the present invention.

FIG. 4 is an erase pulse waveform showing a driving method according to a fourth embodiment of the present invention.

FIG. 5 is a plan view and a cross-sectional view of a plasma display panel.

FIG. 6 is a configuration diagram of a plasma display panel focusing on electrode arrangement.

FIG. 7 is a driving voltage waveform of a plasma display panel,
FIG. 3 is a diagram showing a light emission waveform.

FIG. 8 is an explanatory diagram of a line width erase pulse and a wide width erase pulse in the plasma display panel.

[Explanation of symbols]

1, 2 sustain pulse 3 scanning pulse 4, 7 to 10 erase pulse 4a narrow erase pulse 4b wide erase pulse 5 data pulse 6 emission waveform 11 first insulating substrate 12 second insulating substrate 13 row electrode 14 column electrode 15 discharge gas space 16 partition 17 phosphor 18a, 18b insulating layer 19 protective layer 20 pixel 21 plasma display panel 22 seal portion _{D 1, D 2, ···,} D n - 1, D n column electrodes S _{u 1,} S _{c 1,} ···, S _um, S _cm row electrodes _{S u 1, S u 2,} ···, S um - 1, S um sustain electrodes _{S c 1, S c 2,} ···, S cm - 1, S _cm scanning electrode

Claims (2)

(57) [Claims] In a method of driving a dot matrix display type AC plasma display panel having a memory function, at least an erase pulse for terminating light emission is provided .
A first part and a second part, wherein the first part is
A high voltage that generates a discharge in all necessary cells in the panel
Pressure pulse, narrow enough to not form wall charge
A pulse voltage waveform, wherein the second portion is a discharge sustaining voltage.
A pulse waveform less than or equal to the pressure, the width being greater than the first portion.
A method for driving a plasma display panel, comprising a thick pulse voltage waveform having a low voltage . 2. The second portion has the same polarity as the first portion.
The first part after the pulse waveform having the characteristic and the voltage equal to or lower than the sustaining voltage.
The pulse waveform has a polarity opposite to that of the minute and is equal to or lower than the sustaining voltage.
The plasma display according to claim 1, wherein:
Panel driving method.