JPH0736408A - Method for driving plasma display panel - Google Patents

Abstract

PURPOSE:To stabilize erase operation by the driving of a plasma display panel. CONSTITUTION:In a method for driving a dot matrix display type AC plasma display panel having a memory function, an erase pulse for ending emission is constituted of a first part 7a of the erase pulse and a second part 7b of the erase pulse. The first part 7a of the erase pulse applies a pulse voltage having a pulse width narrower than that of the second part 7b of the erase pulse and high voltage so that weak discharge are surely started in all cells in the panel. The voltage of a discharge maintaining voltage or below is applied to the next second part 7b of the erase pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called dot matrix type memory type AC plasma display panel for use in personal computers, office workstations, wall-mounted televisions, etc., which are expected to grow in recent years. The present invention relates to a method of erasing a drive device.

[0002]

2. Description of the Related Art A conventional AC type plasma display panel has a structure shown in FIG. In FIG. 5, (A) is a plan view and (B) is a sectional view taken along line xx ′ of (A). This 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 and Xe, and a discharge. A partition wall 16 that secures a gas space and divides pixels, and a phosphor 1 that converts 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 discharge. In addition, in FIG.
Reference numeral 20 indicates a pixel. A plasma display capable of color display can be obtained by separately applying the phosphor 17 to each pixel in three colors.

Next, FIG. 6 shows one in which only the electrodes of the plasma display panel are focused. In FIG. 6, 21
Is a plasma display panel, 22 is the first insulating substrate 1
A sealing part for bonding the first and second insulating substrates 12 together, sealing the discharge gas inside and hermetically sealing, S _{u 1} , S _{u 2} ,.
.., S _{um -1} , and S _um are sustain electrodes, S _{c 1} ,
S _c2 , ..., S _{cm -1} , 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 represent column electrodes.

FIG. 7 is a diagram showing an example of drive voltage waveforms and light emission waveforms of the plasma display panel shown in FIGS. In FIG. 7, a waveform (A) is a voltage waveform applied to the sustain electrodes S _{u 1} , S _{u 2} , ..., S _{um −1} , S _um , and a waveform (B) is applied to the scan electrode S _{c 1} . Waveform waveform (C) is a voltage waveform applied to scan electrode S _{c 2} , waveform (D) is a voltage waveform applied to scan electrode S _{cm −1} , and waveform (E) is a scan electrode S _cm . The applied voltage waveform, waveform (F) is the voltage waveform applied to the column electrode D _j , waveform (G) is the light emission waveform of the pixel connected to the scan electrode S _{c 1} , and waveform (H) is the scan electrode S _cm . The light emission waveforms of connected pixels are shown. Sustain electrodes S _{u 1} , S _{u 2} ,
The sustain pulse 1 is applied to S _{um −1} and S _um . Further, the scan electrodes S _{c 1} , S _{c 2} , ..., S
_{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 light emission data, the 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 the scan pulse and the data pulse are applied between the scan electrode and the column electrode at the same timing to perform the write discharge, the adjacent discharge is maintained thereafter. The sustain discharge is sustained by sustain pulse 1 and sustain pulse 2 between the electrode and the scan electrode. Such a function is called a memory function. Further, the erase pulse applied to the scan electrodes is a narrow erase pulse and a thick line erase pulse as shown in FIG. The first edition, 1st edition, is described on page 90).

[0006]

However, each of the erase pulses shown in FIG. 8 has its drawbacks. The narrow erase pulse 4a shown in FIG. 8A has a large erase operation margin with respect to a fixed load, but is weak against variations in pulse shape and voltage. For example, as the screen size increases, the number of cells to be erased changes greatly depending on the displayed image. Such a large load fluctuation distorts the applied pulse waveform greatly. In particular, a narrow erase pulse that needs to be controlled with a narrow pulse width and is applied is easily affected by waveform distortion, and it is difficult to uniformly erase a large screen panel regardless of the display screen state. Further, the thick erase pulse 4b shown in FIG. 8B weakens the wall charges by generating weak discharge by a wide application pulse of low voltage. Less susceptible to fluctuations. However, since the wide erase pulse has a narrow erase operation margin, it is vulnerable to fluctuations in the erase voltage due to cell-to-cell variations in a large screen, making it 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, at least a first portion of an erase pulse for ending light emission and sustaining of discharge are provided. A method for driving a plasma display panel, comprising a second portion having a pulse voltage waveform equal to or lower than a voltage, the first portion having a pulse voltage waveform having a narrower width and a higher voltage than the second portion. Is obtained.

[0008]

EXAMPLE As a plasma display panel, as shown in FIG.
6 was used, and He-Xe was used as the filling gas. The drive waveform used was the same as the conventional drive waveform shown in FIG. 7, except for the erase pulse.

FIG. 1 shows a first embodiment of the 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 can 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 (100V) which is lower than the sustaining voltage.
Then, the second portion 7 of the erase pulse having a pulse width of 3 μs
By applying b, weakening of the wall charges and space charges by weak discharge was performed, resulting in erasing discharge. Regarding the pulse width of the second portion of the erase pulse shown here, an erase margin was obtained when it was 300 ns or more, and it could be used for practical purposes.

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 in this way, in the first portion 7a of the erase pulse, the activity that contributes to discharge in all cells is activated. A large number of particles could be generated, and a weak discharge for erase could be reliably generated by the second portion 7b of the erase pulse. Therefore, the erase operation margin is greatly improved. Moreover, even in a large-screen panel, the main erasing discharge is a kind of wide-width erasing by the second portion 7b of the erasing pulse, so it is resistant to load fluctuations. As described above, a stable display image can be provided.

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

FIG. 3 shows a third embodiment of the erase pulse of the present invention. The first part 7 of the erase pulse shown in FIG.
First, the first portion 9a of the same erase pulse as a and the second portion 9b of the same erase pulse as the second portion 7b of the erase pulse are applied. This is followed by a second part 9b of the erase pulse.
At the same time, the second portion 9c of the erase pulse, which constitutes the second portion of the erase pulse, was applied. The erase pulse 9c had a voltage equal to or lower than the discharge start voltage and a pulse width of 300 ns. As described above, by combining the pulse having the low polarity with the low voltage as the second portion of the erase pulse, the charges that cannot be erased in the second portion 9b of the erase pulse are transferred to the second portion of the erase pulse. With 9c, weak discharge was performed again, and weakened. As a result, the stability of the erasing operation margin is 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 of the present invention. Unlike FIG. 1, FIG. 4 returns to the reference potential momentarily after the end of the first portion 10a of the erase pulse. Then, the second portion 10b of the erase pulse was applied while the active particles and the space charge in the discharge by the first portion 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 for the low voltage pulse of the second portion of the erase pulse, the first portion of the erase pulse that is always the trigger pulse and the second portion of the erase pulse that is the low voltage erase pulse.
The part does not have to be completely continuous.

In the above embodiments, 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 erase operation margin for large load fluctuations can be further expanded.

Further, in the above embodiments, the example in which the erase pulse of the present invention is applied to the scan erase has been described, but the present invention is not limited to this, and the erase pulse of the present invention erases the entire panel all at once. Can also be applied.

In the above embodiments, 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, and the AC surface is not limited thereto. Any discharge type plasma display panel can be applied.

[0018]

As described above, when the memory type AC plasma display panel is driven, the introduction of the first portion of the erase pulse of the present invention surely causes the weak discharge which triggers the erase discharge, The second portion of the erase pulse makes it possible to reliably perform the erase operation. Therefore, even in the case of a large load fluctuation such as a moving image display, the erase operation can be stably performed over the entire panel, and the display quality is remarkably improved.

[Brief description of drawings]

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

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

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

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

FIG. 7 is a driving voltage waveform of a plasma display panel,
It is a figure which shows and a light emission waveform.

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

[Explanation of symbols]

1, 2 Sustain pulse 3 Scan pulse 4, 7 to 10 Erase pulse 4a Narrow erase pulse 4b Wide erase pulse 5 Data pulse 6 Light 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 scan electrode

Claims (1)

[Claims] 1. A method of driving a dot matrix display type AC plasma display panel having a memory function, wherein an erasing pulse for terminating light emission comprises at least a first portion and a pulse voltage waveform equal to or lower than a discharge sustaining voltage. The method for driving a plasma display panel according to claim 1, wherein the first portion has a pulse voltage waveform having a narrower width and a higher voltage than the second portion.