JP2003005704A - Driving method for plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that, when gentle initialization pulse is impressed to scan electrodes, an intense discharge is generated and then a luminescent spot is generated in a plasma display. SOLUTION: In this driving method, a thin-width pulse whose polarity is the same as that of an initialization pulse is impressed to a scan electrode prior to the impressing of the initialization pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display driving method.

[0002]

2. Description of the Related Art FIG. 7 is a schematic view of the structure of a general surface discharge type AC-PDP.

The data side driving section 33 is connected to the m number of data side electrodes 30 arranged on the plasma display panel, and the scan side driving section 34 is connected to the n number of scan side electrode groups 31 which intersect the data side electrodes 30 vertically. And the sustain-side drive unit 35 is connected to the n sustain-side electrode groups 32 arranged in parallel to the scan-side electrode group 31.

FIG. 8 is a schematic view of a cell structure of a general AC discharge type plasma display.

As shown in FIG. 8, a scan side electrode group 31, a sustain side electrode group 32, and a dielectric 41 are provided on the surface of the front plate 40.
And the protective film 42 is arranged, and the data side electrode 30, the dielectric 45, the cell partition wall 43 and the phosphor 46 are arranged on the surface of the back plate 44. In addition, gas 4
7 is enclosed. Reference numeral 50 is a phosphor surface near the data side electrode 30, 51 is a protective film surface near the scan side electrode group 31, and 52 is a protective film surface near the sustain side electrode group 32.

In the AC discharge type plasma display, gradation is expressed by dividing one frame image into a plurality of subfields. Further, one subfield is divided into four periods to control the discharge of gas in the cell. The four periods will be described with reference to FIG.

FIG. 5 shows a driving waveform of a general conventional AC discharge type plasma display.

In the initialization period 61, a pulse Pst is applied to accumulate wall charges in all cells in order to facilitate discharge. In the writing period 62, writing discharge is performed by applying the scanning pulse Pscn and the writing pulse Pw to the data side electrode 30 and the scan side electrode group 31 of the cell to be lit. In the sustain period 63, the sustain pulse Psus is applied to light the cell written in the write period 62 and maintain the lighting. In the erasing period 64, the erasing pulse Pe is applied to erase the wall charges to stop the cell lighting.

FIG. 6 is a model diagram for explaining the movement of charges in the cell.

In the initialization period 61, a constant DC voltage is applied to the data side electrode 30 and the sustain side electrode group 32, and a positive pulse Pst is applied to the scan side electrode group 31 to cause discharge (FIG. 6 ( a)). Since the charges generated thereby are accumulated on the wall surface of the cell so as to cancel out the potential difference between the data side electrode 30, the scan side electrode group 31, and the sustain side electrode group 32, negative charges are formed on the protective film surface 51. In addition, positive charges are accumulated as wall charges on the phosphor surface 50 and the protective film surface 52. Due to this wall charge, a wall voltage V1 is generated between the writing side electrode and the scan side electrode, and a wall voltage V2 is generated between the scan side electrode and the sustain side electrode (FIG. 6B).

In the writing period 62, the scan pulse Pscn and the write pulse Pw are applied in the same direction as the wall voltage V1 to the data side electrode 30 and the scan side electrode group 31 intersecting the cells to be lit, thereby applying the gas 47. The applied voltage exceeds the discharge start voltage, and discharge occurs between the data side electrode and the scan side electrode. At this time, since a constant DC voltage is applied to the sustain-side electrode group 32 in the same direction as the wall voltage V2, the previous discharge is triggered to generate a discharge between the scan-side electrode and the sustain-side electrode (FIG. 6).
(C)). After that, the charges in the gas 47 are moved to accumulate negative charges on the phosphor surface 50 and the protective film surface 52, and positive charges are accumulated on the protective film surface 51. Due to this wall charge, a wall voltage V is applied between the scan side electrode and the sustain side electrode.
3 occurs (FIG. 6 (d)).

In the sustain period 63, the sustain discharge is performed by applying the sustain pulse Psus to the scan side electrode group 31, that is, by applying the voltage in the same direction as the wall voltage V3 between the sustain side electrode and the scan side electrode. (FIG. 6 (e)). After that, due to the electric field applied to the gas 47, negative charges are accumulated on the protective film surface 51, and positive charges are accumulated on the protective film surface 52 as wall charges to generate the wall voltage V4 (FIG. 6 (f)). ). Next, by applying the sustain pulse Psus to the sustain-side electrode group 32,
A voltage is applied in the same direction as the wall voltage V4 to cause sustain discharge (FIG. 6 (g)). Then, due to the electric field applied to the gas 47, positive charges are accumulated on the protective film surface 51 and negative charges are accumulated on the protective film surface 52 as wall charges (FIG. 6 (h)).

In the erase period 64, by applying the erase pulse Pe, the wall voltage due to the wall charges accumulated in the sustain period 63 and the voltage of the erase pulse Pe are applied to the gas 47 to generate the erase discharge (FIG. 6 (i )). Here, the charge accumulated in the cell is discharged to perform a strong discharge in the entire cell, and then the potential difference between each electrode is reduced to prevent the charge from moving to the vicinity of the electrode to reduce the wall charge. (FIG. 6 (j)). If a voltage remains applied between the scan-side electrode and the sustain-side electrode after the erasing discharge occurs, the wall charges are conversely accumulated by the voltage. An auxiliary erase pulse Pe2 is applied to erase the wall charges.

6 (e) to 6 (j) are repeated to control the light emission and discharge for each subfield to express the gradation.

[0015]

However, since the discharge due to the erase pulse depends on the wall charges formed in the sustain period, if the sufficient wall charge is not accumulated in the sustain period 63, the discharge due to the erase pulse Pe weakens and the wall is discharged. The effect of erasing charges is reduced.

Actually, at the beginning of the sustain period 63, the period in which no discharge has occurred in the gas 47 before that period lasts for a long period of time, and therefore the electric charge is small. When the sustain pulse Psus is applied in this state, the amount of electric charges in the gas 47 is small, so that the sustain discharge becomes weak and the electric charges generated by this discharge are also small. Since the charges generated at this time move to the vicinity of each electrode to form wall charges, the wall charges are also reduced. In the high gradation subfield, after this, gas 4
By sustain pulse Psus being applied before the charge in 7 is neutralized and the discharge is repeated, the sustain discharge is strengthened and the wall charge is increased, but the number of sustain pulses is 20 or less (hereinafter, low-brightness subfield). There is little wall charge. That is, the erasing period 64 is started with the wall voltage low. When the erase pulse Pe is applied in this state, the wall voltage is low, so the voltage applied to the gas 47 becomes low, and the erase discharge weakens. Therefore, the wall charges cannot be erased sufficiently.
When the initialization pulse Pst is applied in the initialization period 61 while the wall charges are not sufficiently erased, the sum of the wall voltage due to the remaining wall charges and the voltage between the scan side electrode and the sustain side electrode is applied to the gas 47. As a result, a strong discharge occurs.
After this discharge, since a large voltage is applied between the scan side electrode and the sustain side electrode, the scan side electrode group 3
A large amount of wall charge is accumulated in the vicinity of 1 and the sustain-side electrode group 32. For this reason, even in a cell in which data is not written, discharge occurs when the sustain pulse Psus is applied. As a result, it appears as a bright spot.

[0017]

In order to solve the above problems, a plasma display driving method of the present invention comprises a plurality of first row electrodes and a plurality of second row electrodes, and an initialization pulse. A method for driving an AC discharge type plasma display having an initializing period of applying a full discharge to apply a narrow pulse having the same polarity as the initializing pulse immediately before applying the initializing pulse. And

A plasma display driving method according to the present invention comprises a plurality of first row electrodes and a plurality of second row electrodes, and a voltage exceeding a discharge start voltage before a writing period for selecting a pixel to be lit. The AC discharge type plasma display driving method of applying the reset pulse according to, wherein the narrow pulse having the same polarity as the reset pulse is applied immediately before the reset pulse is applied.

The plasma display driving method of the present invention is characterized in that the rising time of the narrow pulse is 3 μs or less.

The plasma display driving method of the present invention is characterized in that the pulse width of the narrow pulse is 0.5 to 5 μs.

In the plasma display driving method of the present invention, a pulse is alternately applied to the first row electrode and the second row electrode to perform light emission discharge, and then the first row electrode or the second row electrode. A method for driving a plasma display having an erasing period in which an erasing pulse is applied to the row electrode to stop the light emission discharge, wherein the first row electrode and the second row electrode when the narrow pulse is applied. Is larger than the potential difference between the first row electrode and the second row electrode when the erase pulse is applied.

The plasma display driving method of the present invention is a method for driving a plasma display in which one field period is divided into a plurality of subfield periods to express gray scales, and the number of sustain pulses is a predetermined value. It is characterized in that the narrow pulse is applied only when lighting is performed in a subfield equal to or less than a value.

The plasma display driving method of the present invention comprises a plurality of first row electrodes and a plurality of second row electrodes, and performs gradation expression by dividing one field period into a plurality of subfield periods. An AC discharge type plasma display driving method having a sustain period in which a sustain pulse is alternately applied to the first row electrode and the second row electrode to perform a light emission discharge, wherein the number of sustain pulses is predetermined. In addition, only the voltage of the sustain pulse in the subfield that is equal to or less than the predetermined value is set higher than the voltage of the sustain pulse in the other subfields.

In the plasma display driving method of the present invention, only the voltage of the last sustain pulse in a subfield in which the number of sustain pulses is equal to or less than a predetermined value,
It is characterized in that it is made higher than the voltage of the other sustain pulses.

The plasma display driving method of the present invention comprises a plurality of first row electrodes and a plurality of second row electrodes, and performs gradation expression by dividing one field period into a plurality of subfield periods. A plasma display driving method of stopping light emission discharge by an erasing pulse, wherein the number of sustain pulses is equal to or less than a voltage of an erasing pulse of a subfield in which the number of sustain pulses is equal to or less than a predetermined value. It is characterized by making it higher than.

The plasma display driving method of the present invention is characterized in that the predetermined value is 20 or less.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention (claims 1 to 6 and 1)
The plasma display driving method of 0) is characterized in that a narrow pulse having the same polarity as that of the reset pulse is applied before the reset pulse is applied, and wall charges that cannot be erased in the erase period in the low-brightness subfield are removed. It is possible to erase by applying a narrow pulse and suppress the generation of bright spots.

According to the plasma display driving method of the present invention (claims 7, 8 and 10), only the voltage of the sustain pulse in the sub-field having the sustain pulse number of 20 or less or the voltage of the last sustain pulse of the sub-field, other sub-fields are used. It is characterized in that it is higher than the voltage of the sustaining pulse in the field.Before the transition to the erasing period, a large amount of wall charge is accumulated and the voltage applied to the gas is increased to perform strong erasing discharge and generate bright spots. Can be suppressed.

The plasma display driving method of the present invention (claims 9 and 10) is characterized in that only the erase pulse of the subfield having the number of sustain pulses of 20 or less is set higher than the voltage of the erase pulse of the other subfields. By increasing the voltage of the erase pulse, it is possible to suppress the occurrence of bright spots by making up for the lack of the wall voltage at the transition of the erase period to perform strong erase discharge in a subfield having a lower luminance than other subfields. it can.

(Embodiment 1) Embodiments of the present invention (claims 1 to 6 and 10) are shown in FIGS. 1, 5 and 8.
Will be described below.

FIG. 5 shows a voltage waveform applied to each electrode of the plasma display panel in the conventional driving method. In the conventional driving method, the voltages of the erase pulse Pe in each subfield are all the same.

In this driving method, in the low-brightness subfield, the erasing period 64 shifts to a state in which the wall charges are small, so that the erasing discharge becomes weak and the erasing of the charges becomes incomplete.

FIG. 1 is a voltage waveform of a sustain period applied to the data side electrode 30, the scan side electrode group 31, and the sustain side electrode group 32 of the plasma display panel shown in FIG. 8 in the present invention. The driving waveform in the present invention is characterized in that the narrow pulse 1 having the same polarity as the initialization pulse Pst is applied before the initialization pulse Pst is applied.

As described above, in the low-brightness subfield, the wall charges are not completely erased and remain, but the narrow pulse 1 having a higher voltage than the erase pulse Pe is applied before the initialization pulse is applied. It is necessary to erase the remaining wall charges.

More specifically, when the initializing pulse Pst is applied in the initializing period 61 while the wall charges are not sufficiently erased, the wall voltage of the gas 47 and the scan side electrode-sustain are applied to the gas 47 at the inclined portion. Since the sum of the voltages between the side electrodes is applied, a strong discharge occurs. At this time, since a large voltage is applied between the scan-side electrode and the sustain-side electrode, a large amount of wall charges are accumulated, and discharge occurs even when the sustain pulse Psus is applied even in a cell in which writing is not performed. In order to prevent this, the narrow pulse 1 is applied before the initialization pulse is applied to erase the remaining wall charges. At this time, the voltage of the narrow pulse 1 is higher than the erase pulse Pe because a voltage for discharging the remaining wall charges without discharging even if the erase pulse Pe is applied is required.
When this narrow pulse 1 is applied, the sum of the wall voltage due to the remaining wall charges and the voltage between the scan-side electrode and the sustain-side electrode is applied to the gas 47, which causes the erase discharge and the wall. The charge decreases.

After that, in the initialization period 61, the initialization pulse P
Even if st is applied, since only the voltage between the scan-side electrode and the sustain-side electrode is applied to the gas 47, strong discharge does not occur. As a result, since the discharge does not occur only by applying the sustain pulse Psus, it is possible to suppress the generation of bright spots.

Further, by making the rising edge of the narrow pulse 1 steep, it is possible to prevent discharge from occurring at a low voltage at the time of rising and reduce the wall charge. Therefore, since the discharge is not generated only by applying the sustain pulse Psus, it is possible to suppress the generation of bright spots.

Further, by reducing the pulse width of the narrow pulse 1 to reduce the potential difference between the scan side electrode and the sustain side electrode immediately after the discharge is generated, the wall charges accumulated near the electrode after the discharge is reduced. be able to. Therefore, since the discharge is not generated only by applying the sustain pulse Psus, it is possible to suppress the generation of bright spots.

(Embodiment 2) An embodiment of the present invention (claims 7, 8 and 10) will be described below with reference to FIGS. 2, 3, 5 and 8.

FIG. 8 is a schematic view of a cell structure of a general AC discharge type plasma display.

As shown in FIG. 8, a scan side electrode group 31, a sustain side electrode group 32, and a dielectric 41 are provided on the surface of the front plate 40.
And the protective film 42 is arranged, and the data side electrode 30, the dielectric 45, the cell partition wall 43 and the phosphor 46 are arranged on the surface of the back plate 44. A gas 47 for emitting and discharging light is enclosed in the space inside the cell. 50 is a phosphor surface near the data-side electrode 30, 51 is a scan-side electrode group 31
A protective film surface in the vicinity thereof and 52 are protective film surfaces in the vicinity of the sustain-side electrode group 32. This name will be used hereafter.

FIG. 5 shows a voltage waveform applied to each electrode of the plasma display panel in the conventional driving method. In the conventional driving method, the voltage of the sustain pulse Psus in each subfield is the same.

In this driving method, in the low-brightness subfield, the erasing period 64 shifts to a state in which the wall charges are small, so that the erasing discharge becomes weak and the erasing of the charges becomes incomplete.
In order to sufficiently perform the erase discharge, it is necessary to accumulate the wall charges before shifting to the erase period 64.

2 and 3 are voltage waveforms in the sustain period applied to the data side electrode 30, the scan side electrode group 31, and the sustain side electrode group 32 of the plasma display panel shown in FIG. 8 in the present invention. The driving waveform of the present invention is characterized by increasing the voltage of all sustain pulses or final sustain pulses in the low luminance subfield.

In order to accumulate the wall charges before shifting to the erase period 64, only the sustain pulses in the low luminance subfield or only the final sustain pulse are increased in voltage as compared with the sustain pulses in other subfields. As a result, a strong electric field is applied to the gas 47 to forcibly accumulate charges in each electrode that were not neutralized and accumulated in the gas in the conventional drive. As a result, when the erase pulse Pe is applied next,
The sum of the wall voltage due to the wall charge and the voltage between the scan side electrode and the sustain side electrode is applied to the gas 47,
A strong erase discharge is performed to erase the wall charges.

After that, in the initialization period 61, the initialization pulse P
Even if st is applied, since only the voltage between the scan-side electrode and the sustain-side electrode is applied to the gas 47, strong discharge does not occur. As a result, since the discharge does not occur only by applying the sustain pulse Psus, it is possible to suppress the generation of bright spots.

Further, by increasing the voltage of the pulse only to all the sustain pulses or the last sustain pulse in the low-brightness subfield, it is possible to suppress the increase in power consumption due to this.

(Embodiment 3) An embodiment of the present invention (claims 9 and 10) will be described below with reference to FIGS. 4, 5 and 8.

FIG. 5 shows a voltage waveform applied to each electrode of the plasma display panel in the conventional driving method. In the conventional driving method, the voltages of the erase pulse Pe in each subfield are all the same.

In this driving method, in the low-brightness subfield, the erasing period 64 shifts to a state in which the wall charges are small, so that the erasing discharge becomes weak and the erasing of the charges becomes incomplete.

FIG. 4 is a voltage waveform of the sustain period applied to the data side electrode 30, the scan side electrode group 31, and the sustain side electrode group 32 of the plasma display panel shown in FIG. 8 in the present invention. The drive waveform of the present invention is characterized in that the voltage is increased only for the erase pulse Pe of the low luminance subfield.

In the low-brightness subfield, since the erase period 64 is entered with the wall charges being small, the erase pulse Pe
The voltage of the erase pulse Pe must be increased in order to enhance the erase discharge due to.

More specifically, when the erase pulse Pe is applied, the sum of the wall voltage due to the wall charges accumulated in the sustain period 63 and the voltage between the scan side electrode and the sustain side electrode is applied to the gas 47. This causes an erase discharge. However, in the low-brightness subfield, the voltage applied to the gas 47 decreases because the wall charges are small. Here, by increasing the voltage of the erase pulse Pe to compensate for the decreased wall voltage, a strong erase discharge is performed and the wall charges are erased.

After that, in the initialization period 61, the initialization pulse P
Even if st is applied, since only the voltage between the scan-side electrode and the sustain-side electrode is applied to the gas 47, strong discharge does not occur. As a result, since the discharge does not occur only by applying the sustain pulse Psus, it is possible to suppress the generation of bright spots.

[0055]

The plasma display driving method of the present invention (claims 1 to 6) is characterized in that a narrow pulse having the same polarity as that of the initialization pulse is applied before the initialization pulse is applied. In the luminance subfield, wall charges that could not be erased during the erasing period can be erased by applying a narrow pulse, and the occurrence of bright spots can be suppressed.

According to the plasma display driving method of the present invention (claims 7, 8 and 10), only the voltage of the sustain pulse in the low luminance subfield or the voltage of the last sustain pulse of the subfield, and the voltage of the sustain pulse of the other subfields. It is characterized in that it is higher than that of No. 1, and a large amount of wall charge is accumulated before the shift to the erasing period to increase the voltage applied to the gas, thereby performing strong erasing discharge and suppressing the generation of bright spots.

The plasma display driving method of the present invention (claims 9 and 10) is characterized in that only the voltage of the erase pulse of the low luminance subfield is made higher than the voltage of the erase pulse of the other subfields. It is possible to suppress the generation of bright spots by supplementing the lack of the wall voltage at the time of shifting to the erasing period and performing the strong erasing discharge in the sub-field having a lower luminance than other sub-fields by increasing the voltage.

[Brief description of drawings]

FIG. 1 is a diagram showing a voltage waveform applied to each electrode according to the first embodiment of the present invention.

FIG. 2 is a diagram showing a voltage waveform applied to each electrode in the second embodiment of the present invention.

FIG. 3 is a diagram showing a voltage waveform applied to each electrode in the second embodiment of the present invention.

FIG. 4 is a diagram showing a voltage waveform applied to each electrode in the third embodiment of the present invention.

FIG. 5 is a diagram showing an example of a drive voltage waveform of a plasma display panel in a conventional drive.

FIG. 6 is a diagram for explaining discharge in a cell of a plasma display panel in conventional driving.

FIG. 7 is a block diagram showing an overall configuration of a conventional plasma display panel device in driving.

FIG. 8 is a diagram showing an example of the structure of a plasma display panel.

[Explanation of symbols]

1 Narrow pulse that suppresses the generation of bright spots Psus sustain pulse

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G09G 3/288 G09G 3/28 B

Claims (10)

[Claims] 1. A method of driving an AC discharge type plasma display, comprising a plurality of first row electrodes and a plurality of second row electrodes, and having an initialization period in which an initialization pulse is applied to perform full surface discharge. And a narrow pulse having the same polarity as that of the reset pulse is applied immediately before the reset pulse is applied. 2. A plurality of first row electrodes and a plurality of second row electrodes are provided, and an initialization pulse having a voltage exceeding a discharge start voltage is applied before a writing period for selecting a pixel to be lighted. An AC discharge type plasma display driving method, wherein a narrow pulse having the same polarity as that of the initialization pulse is applied immediately before the initialization pulse is applied. 3. The rise time of the narrow pulse is 3 μm
The plasma display driving method according to claim 1, wherein the plasma display driving method is s or less. 4. The pulse width of the narrow pulse is 0.5 to 5
The plasma display driving method according to claim 1, wherein the plasma display driving method is μs. 5. An erase pulse is applied to the first row electrode or the second row electrode after a sustain discharge operation is performed by alternately applying pulses to the first row electrode and the second row electrode. A method of driving a plasma display having an erasing period for stopping a sustain discharge operation by applying a voltage, wherein the potential difference between the first row electrode and the second row electrode when the narrow pulse is applied is the erasing. 5. The plasma display driving method according to claim 1, wherein a potential difference between the first row electrode and the second row electrode when a pulse is applied is larger than the potential difference. 6. A method of driving a plasma display, wherein one field period is divided into a plurality of subfield periods to express gray scales, wherein the number of sustain pulses is equal to or less than a predetermined value. The plasma display driving method according to any one of claims 1 to 5, wherein the narrow pulse is applied only when turned on. 7. A plurality of first row electrodes and a plurality of second row electrodes are provided, and one field period is divided into a plurality of subfield periods to perform gradation expression, and the first row electrodes are provided. And a method for driving an AC discharge type plasma display having a sustain period in which a sustain pulse is alternately applied to the second row electrodes to perform a sustain discharge operation, wherein the number of sustain pulses is equal to or less than a predetermined value. The plasma display driving method, wherein the voltage of the sustain pulse is set higher in only the subfield than the voltage of the sustain pulse in the other subfields. 8. The voltage of only the last sustain pulse in the subfield in which the number of sustain pulses is equal to or less than the predetermined value is set higher than the voltages of other sustain pulses. The plasma display driving method according to claim 7. 9. A plurality of first row electrodes and a plurality of second row electrodes are provided, and one field period is divided into a plurality of subfield periods for gradation expression, and the first row electrodes are provided. And a second row electrode are alternately applied with a pulse to perform a sustain discharge operation, and then the sustain discharge operation is stopped by an erase pulse, wherein the number of sustain pulses is a predetermined value. The method of driving a plasma display, wherein only the voltage of the erase pulse of the subfield equal to or less than the value of is set higher than that of the erase pulses of the other subfields. 10. The plasma display driving method according to claim 6, wherein the predetermined value is 20 or less.