JP2000020022A - Display device and its drive method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and its drive method by which stability of electrical discharge and saving of electrical power are attained. SOLUTION: For the initial setup period after the elapse of the initial delay period from the start of the power source, the bias potential of an address electrode 11 is raised to the setup potential SV, the write pulses Pwa for the number of lines of one screen are successively impressed to the address electrode 11. The write pulses Pwa during the initial setup period are superposed on the setup potential SV. Consequently, a potential difference ΔV0 between the write pulse Pwa to be impressed to the address electrode 11 and the write pulse Pw to be impressed to a scan electrode 12 becomes larger than the potential difference ΔV1 of the normal operation period, and a wall load is formed on the discharge cell.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device for displaying an image by controlling discharge and a driving method thereof.

[0002]

2. Description of the Related Art PDP (Plasma Display Panel)
Is advantageous in that it can be made thinner and have a larger screen. In this plasma display device, an image is displayed by utilizing light emission at the time of gas discharge.

FIG. 12 is a diagram for explaining a method of driving a discharge cell in an AC type PDP. As shown in FIG. 12, in the discharge cell of the AC type PDP, the surfaces of the electrodes 301 and 302 facing each other have the dielectric layers 303 and 30 respectively.
4 is covered.

[0004] As shown in FIG.
When a voltage lower than the discharge starting voltage is applied during 302, no discharge occurs. As shown in FIG.
When a pulse-like voltage (writing pulse) higher than the discharge start voltage is applied between the electrodes 301 and 302, a discharge occurs. When the discharge occurs, the negative charge proceeds toward the electrode 301 and is accumulated on the wall surface of the dielectric layer 303, and the positive charge proceeds toward the electrode 302 and is accumulated on the wall surface of the dielectric layer 304. The charges accumulated on the wall surfaces of the dielectric layers 303 and 304 are called wall charges. The voltage induced by the wall charges is called a wall voltage.

[0005] As shown in FIG.
Negative wall charges are accumulated on the wall of the first layer, and positive wall charges are accumulated on the wall of the dielectric layer 302. In this case, since the polarity of the wall voltage is opposite to the polarity of the externally applied voltage, the effective voltage in the discharge space decreases as the discharge proceeds,
The discharge stops automatically.

As shown in FIG. 12D, when the polarity of the externally applied voltage is inverted, the polarity of the wall voltage becomes the same direction as the polarity of the externally applied voltage, so that the effective voltage in the discharge space increases. If the effective voltage at this time exceeds the discharge starting voltage, a discharge of the opposite polarity occurs. As a result, the positive charge advances toward the electrode 301, neutralizes the negative wall charge already accumulated in the dielectric layer 303, and the negative charge
To neutralize the positive wall charges already accumulated in the dielectric layer 304.

Then, as shown in FIG. 12E, positive and negative wall charges are accumulated on the wall surfaces of the dielectric layers 303 and 304, respectively. In this case, since the polarity of the wall voltage is opposite to the polarity of the externally applied voltage, the effective voltage in the discharge space decreases as the discharge proceeds, and the discharge stops.

Further, as shown in FIG. 12 (f), when the polarity of the externally applied voltage is reversed, a discharge of the opposite polarity is generated, the negative charge proceeds in the direction of the electrode 301, and the positive charge becomes the electrode 3
It proceeds in the direction of 02 and returns to the state of FIG.

As described above, once the discharge is started by applying a write pulse higher than the discharge start voltage, the polarity of the externally applied voltage (sustain pulse) lower than the discharge start voltage is changed by the action of the wall charge. By inverting the discharge, the discharge can be maintained. Starting discharge by applying a write pulse is referred to as address discharge, and sustaining discharge by applying alternately inverted sustain pulses is referred to as sustain discharge.

[0010] As shown in FIG.
By applying an erasing pulse having a polarity opposite to the wall voltage between 302, the wall charges accumulated on the wall surfaces of the dielectric layers 303 and 304 are extinguished, and the discharge can be terminated. The pulse width of the erasing pulse is set narrow so that residual wall charges can be canceled and wall charges of the opposite polarity cannot be newly stored. Once the wall charge disappears, FIG.
As shown in FIG. 2 (h), no discharge occurs even when the next sustain pulse is applied.

FIG. 13 is a schematic diagram mainly showing the structure of a PDP (plasma display panel) of a conventional plasma display device.

As shown in FIG. 13, a PDP 1 has a plurality of address electrodes 11 and a plurality of scan electrodes (scan electrodes) 1.
2 and a plurality of sustain electrodes (sustain electrodes) 13. The plurality of address electrodes 11 are arranged in the vertical direction of the screen, and the plurality of scan electrodes 12 and the plurality of sustain electrodes 13 are arranged in the horizontal direction of the screen. The plurality of sustain electrodes 13 are commonly connected.

A discharge cell is formed at each intersection of the address electrode 11, the scan electrode 12, and the sustain electrode 13. Each discharge cell forms a pixel on the screen.

The address driver 2 drives a plurality of address electrodes 11 according to image data. The scan driver 3 drives the plurality of scan electrodes 12 in order. The sustain driver 4 drives the plurality of sustain electrodes 13 in common.

FIG. 14 is a schematic sectional view of a three-electrode surface discharge cell in an AC type PDP. Discharge cell 1 shown in FIG.
In 00, a pair of scan electrode 12 and sustain electrode 13 are formed in a horizontal direction on surface glass substrate 101, and these scan electrode 12 and sustain electrode 13 are covered with transparent dielectric layer 102 and protective layer 103. I have. On the other hand, an address electrode 11 is formed in a vertical direction on a back glass substrate 104 facing the front glass substrate 101, and a transparent dielectric layer 10 is formed on the address electrode 11.
5 are formed. A phosphor 106 is applied on the transparent dielectric layer 105.

In the discharge cell 100, the address electrode 1
A period in which an address discharge is generated between the address electrode 11 and the scan electrode 12 by applying a write pulse between the scan electrode 12 and the scan electrode 12 and then alternately inverted between the scan electrode 12 and the sustain electrode 13 By applying an appropriate sustain pulse, a sustain discharge is generated between scan electrode 12 and sustain electrode 13.

As a gradation display driving method in the AC type PDP, an ADS (Address and Display Period Separate) is used.
d; address / display period separation) method.
FIG. 15 is a diagram for explaining the ADS method. FIG.
The vertical axis indicates the scanning direction (vertical scanning direction) of the scan electrodes from the first line to the m-th line, and the horizontal axis indicates time.

In the ADS system, one field (1/60)
(Seconds = 16.67 ms) is temporally divided into a plurality of subfields. For example, when performing 256 gradation display with 8 bits, one field is divided into eight subfields. Each subfield is divided into an address period in which an address discharge for selecting a lighting cell is performed and a sustain period (light emission period) in which a sustain discharge for display is performed.

In the example of FIG. 15, one field is temporally divided into four subfields SF1, SF2, SF3 and SF4. The subfield SF1 is divided into an address period AD1 and a sustain period SUS1, the subfield SF2 is divided into an address period AD2 and a sustain period SUS2, and the subfield SF3 is divided into an address period AD
3 and a sustain period SUS3.
F4 is divided into an address period AD4 and a sustain period SUS4.

In the ADS system, the first in each subfield
Scanning by address discharge is performed on the entire surface of the PDP from the line to the m-th line, and a sustain discharge is performed at the end of the address discharge on the entire surface. That is, the sustain period is set to a period excluding the address period. Therefore, the ratio of the sustaining period in one field is as small as about 30%, and there is a limit to increasing the luminance.

In order to increase the brightness of the PDP,
Address and sustain simultaneous drive method (IEICE: TECHNI
CAL REPORT OF IEICE.EID96-71, ED96-149, SDM96-175 (19
97-01) and PP.19-24) have been proposed. FIG. 16 is a diagram for explaining the address / sustain simultaneous driving method. The vertical axis in FIG. 16 indicates the scanning direction (vertical scanning direction) of the scan electrodes from the first line to the m-th line, and the horizontal axis indicates time.

In the address / sustain simultaneous driving method,
The sustain discharge is started after the address discharge for each line. In the example of FIG. 16, one field is temporally divided into four subfields SF1, SF2, SF3, and SF4, and each subfield SF1 to SF4 has an address period AD1 to AD4 and a sustain period SUS1 to SUS4, respectively.
And

In each of the subfields SF1 to SF4, sustain periods SUS1 to SUS4 are set for each line, following the address periods AD1 to AD4. Therefore, almost all of one field is a sustain period, and high luminance can be achieved.

FIG. 17 is a timing chart showing the driving voltage of each electrode according to the conventional address / sustain simultaneous driving method. FIG. 17 shows drive voltages for the sustain electrode 13, the scan electrode 12 and the address electrode 11 on the nth to (n + 3) th lines. Where n
Is any integer.

In FIG. 17, a sustain pulse Psu is applied to the sustain electrode 13 at a constant cycle.
During the address period, a write pulse Pw is applied to the scan electrode 12. A write pulse Pwa is applied to the address electrode 11 in synchronization with the write pulse Pw. Write pulse Pw applied to address electrode 11
ON / OFF of a is controlled according to each pixel of the image to be displayed. When the write pulse Pw and the write pulse Pwa are applied simultaneously, an address discharge occurs at a discharge cell at the intersection of the scan electrode 12 and the address electrode 11, and the discharge cell is turned on.

In the sustain period after the address period, a sustain pulse Psc is applied to the scan electrode 12 at a constant cycle.
The phase of the sustain pulse Psc applied to the scan electrode 12 is the same as that of the sustain pulse Psc applied to the sustain electrode 13.
The phase is shifted by 180 degrees with respect to the phase of su. In this case, the sustain discharge occurs only in the discharge cells lit by the address discharge.

At the end of each subfield, an erase pulse Pe is applied to the scan electrode 12. Thereby,
The wall charge of each discharge cell disappears, and the sustain discharge ends. After application of the erasing pulse Pe, before the start of the next subfield, the pause pulse Pr is applied to the scan electrode 12 at a constant period.
Is applied. A period from the application of the erasing pulse Pe to the start of the next subfield is called a pause period.

[0028]

FIG. 18 is a waveform diagram showing the drive voltage of the address electrodes when the power is turned on in the conventional address / sustain simultaneous drive system.

As shown in FIG. 18, when the power switch is turned on, a write pulse Pwa is applied to the address electrode 11 in accordance with each pixel of the image to be displayed during the address period. In this case, the voltage amplitude Va of the write pulse Pwa needs to be set to a value such that wall charges are accumulated in the discharge cells. In the conventional simultaneous address and sustain driving method, as shown in FIG. 17, it is necessary to sequentially apply a write pulse Pwa having a voltage amplitude Va to the address electrode 11 in accordance with each pixel of an image to be displayed in each address period. . Thereby, the charge / discharge current at the address electrode 11 increases, and the power consumption increases.

When the voltage amplitude Va is reduced in order to reduce the power consumption, the formation of wall charges due to the application of the write pulse Pwa due to the variation of the discharge cells becomes insufficient. As a result, the discharge in each discharge cell may become unstable.

An object of the present invention is to provide a display device in which discharge is stabilized and power consumption is reduced, and a driving method thereof.

[0032]

Means for Solving the Problems (1) First invention A display device according to a first invention comprises a plurality of discharge cells and a pulse for forming wall charges in the plurality of discharge cells during a predetermined period after power-on. The apparatus includes wall charge forming means for applying a voltage, and discharge cell selecting means for selectively applying a pulse voltage for starting discharge to a discharge cell to emit light according to image data during a normal operation period.

In the display device according to the present invention, the wall charges are formed in the plurality of discharge cells by applying the pulse voltage for forming the wall charges to the plurality of discharge cells during a predetermined period after the power is turned on. During the normal operation period, the discharge start pulse voltage is selectively applied to the discharge cells to emit light according to the image data, so that discharge occurs in the discharge cells to which the discharge start pulse voltage is applied. Then, the discharge cells emit light, and wall charges leading to discharge are formed.

As described above, since the wall charges are uniformly formed in the plurality of discharge cells before the normal operation period, the discharge stability of the discharge cells during the normal operation period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell is started, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(2) Second Invention In the display device according to the second invention, in the configuration of the display device according to the first invention, the pulse voltage for forming wall charges is higher than the pulse voltage for starting discharge. It is characterized by the following.

A wall charge is uniformly formed in a plurality of discharge cells by applying a pulse voltage for forming a wall charge higher than a pulse voltage for starting discharge to the plurality of discharge cells for a predetermined period after power-on. Can be. Thus, the discharge start pulse voltage applied to the discharge cells corresponding to the normal operation period can be set low.

(3) Third invention In the display device according to the third invention, in the configuration of the display device according to the first or second invention, a predetermined period after the power is turned on is a predetermined time after the power is turned on. It will be set later.

In this case, since the pulse voltage for forming the wall charges is applied to the plurality of discharge cells after the peripheral circuit in the display device is activated, the operation of forming the wall charges to the plurality of discharge cells is stable. Done in

(4) Fourth Invention A display device according to a fourth invention is the display device according to the first, second or third invention, wherein the wall charge forming means is provided for a predetermined period after power-on. A pulse voltage for forming wall charges is generated by applying a predetermined bias voltage to the discharge cell selecting means.

In this case, when the bias voltage is applied to the discharge cell selection means, the pulse voltage for starting discharge generated by the discharge cell selection means increases by the bias voltage, and the increased pulse voltage is used for forming the wall charge. Is applied to a plurality of discharge cells. This eliminates the need for a power supply circuit that generates a high voltage, facilitates integration, and further reduces power consumption.

(5) Fifth Invention A display device according to a fifth invention is the display device according to any one of the first to fourth inventions, wherein the wall charge forming means includes a power supply to the discharge cell selection means. First voltage generating means for applying a voltage, second voltage generating means for generating a bias voltage, and second voltage generating means for applying a power supply voltage generated by the first voltage generating means for a predetermined period after power-on. And superimposing means for superimposing the bias voltage generated by the above.

In this case, during the normal operation period, the discharge cell selection means is driven by the power supply voltage generated by the first voltage generation means, and applies a pulse voltage for starting discharge to the corresponding discharge cell. For a predetermined period after power-on, the first
The power supply voltage generated by the voltage generation means increases by the bias voltage, and the discharge cell selection means is driven by the increased power supply voltage and applies a pulse voltage for forming wall charges to the plurality of discharge cells.

(6) Sixth invention A display device according to a sixth invention is the display device according to the fifth invention, wherein the superimposing means has one and the other terminals and the first voltage generating means. Holding means for holding the power supply voltage generated by the first means at one terminal, connecting the other terminal of the holding means to a reference potential during a normal operation period, and connecting the other terminal of the holding means to the second terminal for a predetermined period after power-on. Switching means for connecting to the bias voltage generated by the voltage generating means.

One terminal of the holding means is held at the power supply voltage generated by the first voltage generating means. During the normal operation period, the other terminal of the holding unit is connected to the reference potential. Thereby, one terminal of the holding means maintains the power supply voltage. During a predetermined period after the power is turned on, the bias voltage generated by the second voltage generating means is applied to the other terminal of the holding means. As a result, the power supply voltage at one terminal of the holding unit increases by the bias voltage.

As described above, since the superimposing means is constituted by the holding means and the switching means, the structure of the wall charge forming means is simplified.

(7) Seventh Invention The display device according to the seventh invention is the display device according to any one of the first to sixth inventions, in which the plurality of discharge cells emit light simultaneously at an arbitrary timing. A non-display period setting unit configured to set a non-display period of an image by stopping the image forming apparatus; wherein the wall charge forming unit includes a plurality of discharge cells for a predetermined period after the end of the non-display period by the non-display period setting unit. A pulse voltage for forming is applied.

In this case, the wall charges are uniformly formed in the plurality of discharge cells even after the non-display period, so that the discharge stability of the discharge cells in the normal operation period after the non-display period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell starts in the normal operation period after the non-display period, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(8) Eighth Invention A display device according to an eighth invention is the display device according to any one of the first to seventh inventions, wherein one of a plurality of video signals is selectively inputted. Further comprising a video signal input unit, wherein the discharge cell selecting unit selectively applies a pulse voltage for starting discharge to a discharge cell to be lit according to image data based on the video signal input by the video signal input unit. The wall charge forming means applies a wall charge forming pulse voltage to the plurality of discharge cells for a predetermined period after the video signal is switched by the video signal input means.

In this case, even after the video signal is switched, the wall charges are uniformly formed in the plurality of discharge cells, so that the discharge stability of the discharge cells during the normal operation period after the video signal is switched is improved. . In addition, since the wall charges have already been formed before the discharge of each discharge cell is started in the normal operation period after the switching of the video signal, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(9) Ninth Invention The display device according to the ninth invention has a plurality of first electrodes arranged in a first direction, and a plurality of first electrodes arranged so as to be paired with each other. A plurality of second electrodes arranged in one direction; a plurality of third electrodes arranged in a second direction intersecting the first direction; a plurality of first electrodes; a plurality of second electrodes. A plurality of discharge cells provided at the intersections of the electrodes and the plurality of third electrodes, wall charge forming means for applying a pulse voltage for forming wall charges to the plurality of third electrodes for a predetermined period after power-on,
A discharge cell selecting means for selectively applying a pulse voltage for starting discharge to a corresponding third electrode according to image data during a normal operation period.

In the display device according to the present invention, each discharge cell has a three-electrode structure. By applying a pulse voltage for wall charge formation to the plurality of third electrodes for a predetermined period after power-on, wall charges are formed in the plurality of discharge cells.
During the normal operation period, a discharge start pulse voltage is selectively applied to the corresponding third electrode according to image data, so that a discharge occurs in the discharge cell to which the discharge start pulse voltage is applied. Then, the discharge cell emits light.

As described above, since the wall charges are uniformly formed in the plurality of discharge cells before the normal operation period, the discharge stability of the discharge cells during the normal operation period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell is started, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(10) Tenth invention A display device according to a tenth invention is the display device according to the ninth invention, wherein a first pulse voltage is periodically applied to the plurality of first electrodes. First voltage applying means,
A second voltage applying means for applying a write pulse voltage to the second electrode at the start of a light emission period set for each of the electrodes, and thereafter periodically applying a second pulse voltage to the second electrode; And the discharge cell selecting means applies a pulse voltage for starting discharge to the corresponding third electrode in synchronization with the write pulse voltage generated by the second voltage applying means.

In this case, at the start of the light emission period set for each second electrode, a write pulse voltage is applied to the second electrode, and a pulse voltage for starting discharge is applied to the corresponding third electrode. Applied. As a result, discharge occurs between the second electrode and the third electrode.

After that, the first pulse voltage is periodically applied to the first electrode, and the second pulse voltage is periodically applied to the second electrode. Thereby, sustain discharge is performed between the first electrode and the second electrode.

(11) Eleventh Invention The display device according to the eleventh invention is the display device according to the ninth or tenth invention, wherein the pulse voltage for forming wall charges is a pulse voltage for starting discharge. Higher.

By applying a wall charge forming pulse voltage higher than the discharge starting pulse voltage to the plurality of third electrodes for a predetermined period after power-on, wall charges are uniformly formed in the plurality of discharge cells. can do. Thus, the discharge start pulse voltage applied to the third electrode corresponding to the normal operation period can be set low.

(12) Twelfth Invention A display device according to a twelfth invention is the display device according to the ninth, tenth or eleventh invention, wherein each field set for each second electrode is provided. Further divided into a plurality of sub-fields in time and further comprises a sub-field dividing means to set a light emitting period in each sub-field,
The discharge cell selection means applies a discharge start pulse voltage to the corresponding third electrode at the start of the light emission period set in each subfield by the subfield division means.

Each field is temporally divided into a plurality of subfields, and a discharge start pulse voltage is applied to the third electrode at the start of the light emission period of each subfield. Then, gradation display is possible.

Also in this case, since the wall charges are uniformly formed in the plurality of discharge cells during a predetermined period after the power is turned on, the stabilization of the discharge in each subfield is improved, and the voltage applied in each subfield is improved. It is possible to set a lower discharge start pulse voltage. Therefore, stable gradation display is possible, and power saving is achieved.

(13) Thirteenth Invention The display device according to the thirteenth invention is the display device according to any one of the ninth to twelfth inventions, wherein the plurality of discharge cells emit light simultaneously at an arbitrary timing. A non-display period setting unit configured to set a non-display period of an image by stopping the display; a wall charge forming unit configured to apply a plurality of third electrodes to the plurality of third electrodes during a predetermined period after the end of the non-display period by the non-display period setting unit; A pulse voltage for forming wall charges is applied.

In this case, the wall charges are uniformly formed in the plurality of discharge cells even after the non-display period, so that the discharge stability of the discharge cells in the normal operation period after the non-display period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell starts in the normal operation period after the non-display period, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(14) Fourteenth Invention A display device according to a fourteenth invention is the display device according to any one of the ninth to thirteenth inventions, wherein any one of a plurality of video signals is selectively inputted. The discharge cell selection means selectively applies a pulse voltage for starting discharge to the corresponding third electrode according to image data based on the video signal input by the video signal input means. The wall charge forming means applies a pulse voltage for wall charge formation to the plurality of third electrodes for a predetermined period after switching of the video signal by the video signal input means.

In this case, since the wall charges are uniformly formed in the plurality of discharge cells even after the switching of the video signal, the stability of the discharge of the discharge cells in the normal operation period after the switching of the video signal is improved. . In addition, since the wall charges have already been formed before the discharge of each discharge cell is started in the normal operation period after the switching of the video signal, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(15) Fifteenth Invention A method for driving a display device according to a fifteenth invention is a method for driving a display device having a plurality of discharge cells, wherein a plurality of discharge cells are provided for a predetermined period after power-on. And a pulse voltage for starting discharge is selectively applied to discharge cells to emit light in accordance with image data during a normal operation period.

In the method of driving the display device according to the present invention, the wall charges are formed in the plurality of discharge cells by applying the pulse voltage for forming the wall charges to the plurality of discharge cells during a predetermined period after the power is turned on. Is done. During the normal operation period, the discharge start pulse voltage is selectively applied to the discharge cells to emit light according to the image data, so that discharge occurs in the discharge cells to which the discharge start pulse voltage is applied. , The discharge cell emits light.

As described above, since the wall charges are uniformly formed in the plurality of discharge cells before the normal operation period, the discharge stability of the discharge cells during the normal operation period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell is started, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(16) Sixteenth Invention According to a sixteenth aspect of the present invention, in the method of driving a display device according to the fifteenth aspect, the pulse voltage for forming wall charges is a pulse for starting discharge. It is characterized by being higher than the voltage.

Applying a pulse voltage for forming a wall charge higher than a pulse voltage for starting discharge to a plurality of discharge cells for a predetermined period after power-on to form wall charges uniformly in the plurality of discharge cells. Can be. Thus, the discharge start pulse voltage applied to the discharge cells corresponding to the normal operation period can be set low.

(17) Seventeenth Invention The method for driving a display device according to the seventeenth invention is the method for driving a display device according to the fifteenth or sixteenth invention, wherein the predetermined period after the power is turned on is the time when the power is turned on. It is set after a lapse of a certain time from.

In this case, since the pulse voltage for forming the wall charges is applied to the plurality of discharge cells after the peripheral circuit in the display device is activated, the operation of forming the wall charges to the plurality of discharge cells is stable. Done in

(18) Eighteenth Invention A method for driving a display device according to the eighteenth invention is the method for driving a display device according to the fifteenth, sixteenth, or seventeenth invention, wherein the discharge is performed during a predetermined period after the power is turned on. A pulse voltage for forming wall charges is generated by superimposing a constant voltage on a pulse voltage for start.

In this case, by superimposing a constant voltage on the pulse voltage for starting discharge, the pulse voltage for starting discharge rises by a constant voltage, and the increased pulse voltage for starting discharge is changed to a pulse for forming wall charges. A voltage is applied to a plurality of discharge cells. This eliminates the need for a power supply circuit for generating a high voltage, facilitates integration, and further reduces power consumption.

(19) Nineteenth Invention A method for driving a display device according to the nineteenth invention is the method for driving a display device according to any one of the fifteenth to eighteenth inventions, wherein a plurality of discharge cells are provided at any timing. The pulse voltage for forming wall charges is applied to a plurality of discharge cells during a predetermined period after the end of the non-display period of the image set by simultaneously stopping the light emission.

In this case, the wall charges are uniformly formed in the plurality of discharge cells even after the non-display period, so that the discharge stability of the discharge cells in the normal operation period after the non-display period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell starts in the normal operation period after the non-display period, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(20) Twentieth Invention The display device driving method according to the twentieth invention is directed to the display device driving method according to any one of the fifteenth to nineteenth inventions, wherein any one of the plurality of video signals is transmitted. A pulse voltage for starting discharge is selectively applied to discharge cells to be selectively input and to emit light according to image data based on the input video signal, and a plurality of discharge cells are provided for a predetermined period after switching of the video signal. Is applied with a pulse voltage for forming wall charges.

In this case, since the wall charges are uniformly formed in the plurality of discharge cells even after the switching of the video signal, the stability of the discharge of the discharge cells in the normal operation period after the switching of the video signal is improved. . In addition, since the wall charges have already been formed before the discharge of each discharge cell is started in the normal operation period after the switching of the video signal, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(21) Twenty-First Invention In the method for driving a display device according to the twenty-first invention, a plurality of first electrodes arranged in a first direction are paired with a plurality of first electrodes, respectively. A plurality of second electrodes arranged in a first direction, a plurality of third electrodes arranged in a second direction intersecting the first direction, a plurality of first electrodes, a plurality of A method for driving a display device comprising: a second electrode and a plurality of discharge cells provided at intersections of a plurality of third electrodes, wherein a wall charge is applied to the plurality of third electrodes for a predetermined period after power-on. A pulse voltage for forming is applied, and a pulse voltage for starting discharge is selectively applied to a corresponding third electrode according to image data during a normal operation period.

In the driving method of the display device according to the present invention, the wall voltage is applied to the plurality of discharge cells by applying the pulse voltage for forming the wall charge to the plurality of third electrodes for a predetermined period after the power is turned on. Is formed. During the normal operation period, a discharge start pulse voltage is selectively applied to the corresponding third electrode according to image data, so that a discharge occurs in the discharge cell to which the discharge start pulse voltage is applied. Then, the discharge cell emits light.

As described above, since the wall charges are uniformly formed in the plurality of discharge cells before the normal operation period, the discharge stability of the discharge cells during the normal operation period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell is started, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(22) Twenty-second invention A driving method of a display device according to a twenty-second invention is the driving method of the display device according to the twenty-first invention, wherein the first pulse voltage is periodically applied to the plurality of first electrodes. After applying a write pulse voltage to the second electrode at the start of a light emission period set for each second electrode, the second
The second pulse voltage is periodically applied to the third electrode, and a pulse voltage for starting discharge is applied to the corresponding third electrode in synchronization with the writing pulse voltage.

In this case, at the start of the light emission period set for each second electrode, a write pulse voltage is applied to the second electrode, and a pulse voltage for starting discharge is applied to the corresponding third electrode. Applied. As a result, discharge occurs between the second electrode and the third electrode.

Thereafter, the first pulse voltage is periodically applied to the first electrode, and the second pulse voltage is periodically applied to the second electrode. Thereby, sustain discharge is performed between the first electrode and the second electrode.

(23) Twenty-third Invention In the display device driving method according to the twenty-third invention, in the display device according to the twenty-first or twenty-second invention, the pulse voltage for forming wall charges is the same as that for starting discharge. Is higher than the pulse voltage.

By applying a pulse voltage for forming wall charges higher than a pulse voltage for starting discharge to a plurality of third electrodes for a predetermined period after power-on, wall charges are uniformly formed in a plurality of discharge cells. can do. Thus, the discharge start pulse voltage applied to the third electrode corresponding to the normal operation period can be set low.

(24) Twenty-fourth Invention The display device driving method according to the twenty-fourth invention is the same as the driving method of the display device according to the twenty-first, twenty-second, or twenty-third invention, but set for each second electrode. Each field is temporally divided into a plurality of subfields, and a light emission period is set in each subfield, and a discharge start pulse is applied to a third electrode corresponding to the start of the light emission period set in each subfield. A voltage is applied.

Each field is temporally divided into a plurality of subfields, and a discharge start pulse voltage is applied to the third electrode at the start of the light emission period of each subfield. Then, gradation display is possible.

Also in this case, the wall charges are uniformly formed in the plurality of discharge cells during a predetermined period after the power is turned on, so that the stabilization of the discharge in each subfield is improved and the voltage applied in each subfield is improved. It is possible to set a lower discharge start pulse voltage. Therefore, stable gradation display is possible, and power saving is achieved.

(25) Twenty-fifth Invention The display device driving method according to the twenty-fifth invention is a method for driving a display device according to any one of the twenty-first to twenty-fourth inventions, wherein the plurality of discharge cells are arranged at an arbitrary timing. The pulse voltage for forming wall charges is applied to a plurality of discharge cells during a predetermined period after the end of the non-display period of the image set by simultaneously stopping the light emission.

In this case, the wall charges are uniformly formed in the plurality of discharge cells even after the non-display period, so that the discharge stability of the discharge cells in the normal operation period after the non-display period is improved. In addition, since the wall charges have already been formed before the discharge of each discharge cell starts in the normal operation period after the non-display period, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

(26) Twenty-Sixth Invention A display device driving method according to a twenty-sixth invention is directed to the display device driving method according to any one of the twenty-first to twenty-fifth inventions, wherein any one of the plurality of video signals is transmitted. Selectively inputting, selectively applying a pulse voltage for starting discharge to a corresponding third electrode according to image data based on the input video signal,
A pulse voltage for forming wall charges is applied to the plurality of third electrodes for a predetermined period after the switching of the video signal.

In this case, even after the switching of the video signal, the wall charges are uniformly formed in the plurality of discharge cells, so that the stability of the discharge of the discharge cells in the normal operation period after the switching of the video signal is improved. . In addition, since the wall charges have already been formed before the discharge of each discharge cell is started in the normal operation period after the switching of the video signal, the pulse voltage for starting the discharge can be set low. Thereby, power saving can be achieved.

[0093]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plasma display device will be described as an example of a display device according to the present invention.

FIG. 1 is a block diagram showing the configuration of a plasma display device according to one embodiment of the present invention. In the plasma display device of this embodiment, the simultaneous address and sustain driving method shown in FIG. 16 is used.

The plasma display device shown in FIG.
P (plasma display panel) 1, address driver 2, scan driver 3, sustain driver 4, discharge control timing generation circuit 5, A / D converter (analog-to-digital converter) 6, scan number converter 7, subfield converter 8 and initial setup voltage conversion circuit 8
Contains 0.

The A / D converter 6 receives the video signal VD. Further, the discharge control timing generation circuit 5, A /
A horizontal synchronizing signal H and a vertical synchronizing signal V are supplied to the D converter 6, the scan number converter 7, and the subfield converter 8.

The A / D converter 6 converts the video signal VD into digital image data, and supplies the digital image data to the scan number converter 7. The scanning number converter 7 converts the image data into P
The data is converted into image data of the number of lines corresponding to the number of pixels of DP1, and the image data of each line is provided to the subfield conversion unit 8. The image data for each line is composed of a plurality of pixel data respectively corresponding to a plurality of pixels of each line. The subfield conversion unit 8 divides each pixel data of the image data for each line into a plurality of bits corresponding to a plurality of subfields, and serially converts each bit of each pixel data to the address driver 2 for each subfield. Output.

The address driver 2 is connected to an initial setup voltage conversion circuit 80 described later. The discharge control timing generation circuit 5 generates the discharge control timing signals SC and S based on the horizontal synchronization signal H and the vertical synchronization signal V.
U is given to the scan driver 3 and the sustain driver 4, respectively.

FIG. 2 is a block diagram mainly showing the configuration of PDP 1 of the plasma display device of FIG.

As shown in FIG. 2, PDP 1 includes a plurality of address electrodes (data electrodes) 11, a plurality of scan electrodes (scan electrodes) 12, and a plurality of sustain electrodes (sustain electrodes) 13. The plurality of address electrodes 11 are arranged in the vertical direction of the screen, and the plurality of scan electrodes 12 and the plurality of sustain electrodes 13 are arranged in the horizontal direction of the screen. The plurality of sustain electrodes 13 are commonly connected.

A discharge cell is formed at each intersection of the address electrode 11, the scan electrode 12, and the sustain electrode 13,
Each discharge cell forms a pixel on the screen.

The address driver 2 converts data serially provided for each subfield from the subfield converter 8 of FIG. 1 to parallel data, and drives a plurality of address electrodes 11 based on the parallel data.

The scan driver 3 includes an output circuit 3a and a shift register 3b, and the sustain driver 4 includes an output circuit. These scan driver 3 and sustain driver 4 are connected to a common power supply circuit 22.

The shift register 3b of the scan driver 3
Supplies the discharge control timing signal SC supplied from the discharge control timing generation circuit 5 of FIG. 1 to the output circuit 3a while shifting in the vertical scanning direction. The output circuit 3a outputs a discharge control timing signal SC supplied from the shift register 3b.
, The plurality of scan electrodes 12 are sequentially driven. The sustain driver 4 drives the sustain electrode 13 in response to a discharge control timing signal SU provided from the discharge control timing generation circuit 5 of FIG.

FIG. 3 is a block diagram showing the initial setup voltage conversion circuit 80 connected to the address driver 2 and its peripheral circuits.

In FIG. 3, a power-on information DON is given to a micro processing unit (MPU) 90 from a power switch of a remote controller. MP
U90 outputs the power-on information Don to each circuit and provides an initial setup control signal ST to the initial setup voltage conversion circuit 80.

In the initial setup voltage conversion circuit 80,
The power supply circuit 81 receives the power supply voltage VDD1, the power supply circuit 82 receives the power supply voltage VDD2, and the power supply circuit 83
Supplies the power supply voltage VSS1. The initial setup voltage conversion circuit 80 applies the power supply voltages VDD and VSS to the high-level power supply terminal and the low-level power supply terminal (ground terminal) of the address driver 2, respectively. The configuration and operation of the initial setup voltage conversion circuit 80 will be described later.

In this embodiment, the address driver 2 corresponds to a discharge cell selecting means, and the initial setup voltage conversion circuit 80 and the power supply circuits 81 to 83 correspond to wall charge forming means. Further, the sustain driver 4 and the discharge control timing generation circuit 5 correspond to a first voltage application unit, the scan driver 3 and the discharge control timing generation circuit 5 correspond to a second voltage application unit, and the subfield conversion unit 8
Corresponds to a subfield dividing unit. Further, the sustain electrode 13 corresponds to the first electrode, and the scan electrode 12
Correspond to the second electrode, and the address electrode 11 corresponds to the third electrode.

FIG. 4 shows the PDP of FIG. 2 during the normal operation period.
5 is a timing chart showing a driving voltage applied to each electrode of FIG. FIG. 4 shows drive voltages for the address electrodes 11, the sustain electrodes 13, and the scan electrodes 12 on the nth to (n + 2) th lines. Here, n is an arbitrary integer.

In FIG. 4, the sustain electrode 13 has
The sustain pulse Psu is applied at a constant cycle. In the address period, the write pulse Pw is applied to the scan electrode 12.
Is applied. A write pulse Pwa is applied to the address electrode 11 in synchronization with the write pulse Pw. ON / OFF of the write pulse Pwa applied to the address electrode 11 is controlled according to each pixel of the image to be displayed.
When the write pulse Pw and the write pulse Pwa are applied simultaneously, an address discharge occurs at a discharge cell at the intersection of the scan electrode 12 and the address electrode 11, and the discharge cell is turned on.

In the sustain period after the address period, sustain pulse Psc is applied to scan electrode 12 at a constant period.
The phase of the sustain pulse Psc applied to the scan electrode 12 is the same as that of the sustain pulse Psc applied to the sustain electrode 13.
The phase is shifted by 180 degrees with respect to the phase of su. In this case, the sustain discharge occurs only in the discharge cells lit by the address discharge.

At the end of each subfield, an erase pulse Pe is applied to the scan electrode 12. Thereby,
As will be described later, the wall charge of each discharge cell is reduced to such an extent that disappearance or sustain discharge does not occur, and the sustain discharge ends. During the rest period after the application of the erase pulse Pe, the scan electrode 12
, A pause pulse Pr is applied at regular intervals. This pause pulse Pr has the same phase as the sustain pulse Psu.

In this embodiment, the write pulse Pwa corresponds to a pulse voltage for starting discharge, and the write pulse Pw corresponds to a write pulse voltage. The sustain pulse Psu corresponds to the first pulse voltage, and the sustain pulse Ps
c corresponds to the second pulse voltage.

FIG. 5 is a waveform diagram showing drive voltages applied to address electrodes and scan electrodes and an initial setup control signal when power is turned on. In FIG. 5, a drive voltage applied to the scan electrodes 12 for m lines is shown as a drive voltage for one scan electrode 12. Here, m is the number of lines on one screen of the PDP 1.

The initial setup period starts after a predetermined initial delay period has elapsed since the power switch was turned on. During the initial delay period, the initial setup control signal ST is at a low level. The length of the initial delay period is, for example, several hundred milliseconds. The length of the initial setup period is, for example, several hundred milliseconds, and is 500 milliseconds in this embodiment.

During the initial setup period, the initial setup control signal ST rises from a low level to a high level. Thereby, the bias of the address electrode 11 rises to a predetermined setup potential SV. The setup potential SV is about 50 to 100V. Setup potential S
V is maintained during the initial setup period, and the initial setup potential SV has a write pulse P generated at a constant cycle.
wa is superimposed. Thereby, the write pulse Pwa
The potential of the address electrode 12 at the time of application is SV + VA. Write pulse P in initial setup period
The number of wa corresponds to the scan electrodes 12 for m lines.
The voltage amplitude of the write pulse Pwa is VA.

In the initial setup period, a write pulse Pw is sequentially applied to the m lines of scan electrodes 12 in synchronization with the write pulse Pwa. The potential difference ΔV0 between the address electrode 11 and the scan electrode 12 when the write pulses Pw and Pwa are applied during the initial setup period
Becomes SV + VA. The initial setup potential S is set such that wall charges are accumulated in each discharge cell by the potential difference ΔV0.
V is set.

In the normal operation period after the end of the initial setup period, the bias of the address electrode 11 falls from the setup potential SV to a normal potential (for example, 0 V). During this normal operation period, as shown in FIG. 4, a write pulse Pwa is applied to each address electrode 11 according to each pixel of an image to be displayed. Also, the scan electrode 12
Is applied with a write pulse Pw at a constant period. The potential difference ΔV1 between the address electrode 11 and the scan electrode 12 when applying the write pulses Pw and Pwa in the normal operation period is VA.

In the plasma display device of this embodiment, negative wall charges are formed on the address electrodes 11 of the discharge cells of the entire screen during the initial setup period, so that the stability of the address discharge is improved.

Further, even if the voltage amplitude VA of the write pulse Pwa applied to the address electrode 11 is reduced, an address discharge can be generated in each discharge cell during the normal operation period. The voltage amplitude VA of the write pulse Pwa can be reduced by several tens of V as compared with the case where the initial setup potential SV is not applied during the initial setup period. Therefore, by reducing the voltage amplitude VA of the write pulse Pwa, the charge / discharge current at the address electrode 11 can be reduced, and power can be saved.

Further, since wall charges are formed in each discharge cell during the initial setup period, the driving voltage applied to scan electrode 12 and sustain electrode 13 can be reduced.

FIG. 6 is a circuit diagram showing a configuration of initial setup voltage conversion circuit 80 of FIG. FIG. 7 is a voltage waveform diagram showing the operation of the initial setup voltage conversion circuit 80 of FIG.

In FIG. 6, initial setup voltage conversion circuit 80 includes control signal generation circuits 85 and 86, a P-channel MOS field effect transistor (hereinafter, referred to as P-channel transistor) TP, and an N-channel MOS field effect transistor (hereinafter, N-channel MOS transistor). A channel transistor) TN,
Includes capacitors C1 and C2 and diodes D1 and D2.

The positive electrode of power supply circuit 81 is connected to node N0 via P-channel transistor TP. The negative electrode of the power supply circuit 81 is grounded. Control signal GP generated by control signal generation circuit 85 is applied to the gate of P-channel transistor TP. Node N0 is grounded via N-channel transistor TN. Control signal GN generated by control signal generating circuit 86 is applied to the gate of N-channel transistor TN.

On the other hand, the positive electrode of power supply circuit 82 is connected to node N1 via diode D1. Node N1
The capacitor C1 is connected between the node and the node N0. The negative electrode of the power supply circuit 82 is grounded.

The positive terminal of the power supply circuit 83 is connected to the node N2 via the diode D2. The capacitor C2 is connected between the node N2 and the node N0. The negative electrode of the power supply circuit 83 is grounded.

From the positive electrode of the power supply circuit 81, the power supply voltage VDD1
Occurs, the power supply voltage VDD2 is generated from the positive electrode of the power supply circuit 82, and the power supply voltage VSS1 is generated from the positive electrode of the power supply circuit 83. The power supply voltage VDD is extracted from the node N1,
The power supply voltage VSS is extracted from the node N2.

In this embodiment, the initial setup voltage conversion circuit 80 corresponds to the superimposing means. The capacitor C
1 and C2 and the diodes D1 and D2 correspond to holding means, and the P-channel transistor TP, the N-channel transistor TN, and the control signal generation circuits 85 and 86 correspond to switching means.

Next, the operation of the initial setup voltage conversion circuit 80 of FIG. 6 will be described with reference to the voltage waveform chart of FIG.

Here, the power supply voltage VDD1 generated from the power supply circuit 81 is set to 50V, the power supply voltage VDD2 generated from the power supply circuit 82 is set to 150V, and the power supply voltage VSS1 generated from the power supply circuit 83 is set to 10V.

In the initial delay period and the normal operation period, control signal G generated by control signal generation circuit 85 is applied.
The voltage of P becomes 50V, and the voltage of the control signal GN generated by the control signal generation circuit 86 becomes 10V. This turns off the P-channel transistor TP and turns on the N-channel transistor TN.

Then, the diode D1 is connected to the node N1.
, The power supply voltage VDD2 of the power supply circuit 82 is applied. Therefore, power supply voltage VDD at node N1 has a value (approximately 150 V) lower than power supply voltage VDD2 by the built-in voltage of diode D1. The node N2 has a power supply voltage V of the power supply circuit 83 via a diode D2.
SS1 is applied. Therefore, the power supply voltage VSS of the node N2 has a value (approximately 10 V) lower than the power supply voltage VSS1 by the built-in voltage of the diode D2.

In the initial setup period, the voltage of control signal GP generated by control signal generation circuit 85 is 40 V
And the voltage of the control signal GN generated by the control signal generating circuit 86 becomes 0V. As a result, the P-channel transistor TP turns on, and the N-channel transistor TN
Turns off.

Then, the power supply voltage VDD1 of the power supply circuit 81 is superimposed on the potential (approximately 150 V) stored in the capacitor C1 as a bias voltage. Thereby, the node N
The power supply voltage VDD of one is approximately 200V. In addition, the power supply voltage VDD1 of the power supply circuit 81 is superimposed on the potential (approximately 10 V) stored in the capacitor C2 as a bias voltage. As a result, the power supply voltage VSS of the node N2 becomes approximately 6
It becomes 0V.

As described above, in the initial setup period, the power supply voltages VDD,
VSS rises by the power supply voltage VDD1. Thereby, as shown in FIG. 5, the potential of the write pulse Pwa increases by the setup potential SV.

Initial setup voltage conversion circuit 80 shown in FIG.
Since the power supply voltages VDD and VSS are increased during the initial setup period by switching the bias voltage applied to the power supply voltages VDD2 and VSS1 by the P-channel transistor TP and the N-channel transistor TN, the configuration is simplified and the high voltage can be reduced. No power circuit is required. Therefore, high integration is facilitated.

FIG. 8 is a block diagram showing a configuration of a plasma display device according to another embodiment of the present invention. FIG. 9 is a block diagram showing an initial setup voltage conversion circuit connected to the address driver of the plasma display device of FIG. 8 and its peripheral circuits.

The switching circuit 92 is provided in the plasma display device of FIG. The switching circuit 92 is supplied with an input switching signal ISW from an input switching switch of the remote controller. The switching circuit 92 is supplied from an NTSC video signal NT supplied from an antenna, a Hi-Vision video signal HD supplied from an antenna, a video signal PC supplied from a personal computer video input terminal, and a first video input terminal. An A / D converter receives a video signal V1 and a video signal V2 supplied from a second video input terminal, selects one of the video signals in response to an input switching signal ISW, and uses the video signal as a video signal VD as an A / D converter. Enter 6

The discharge control timing generating circuit 5 is supplied with an image mute signal MUT from an image mute switch of the remote controller. The image mute period is set by the image mute signal MUT.
During the image mute period, the discharge control timing generation circuit 5
Are all scan electrodes 12 and sustain electrodes 13
Is set to low level. Thereby, the discharge is stopped in all the discharge cells.

As shown in FIG. 9 and FIG.
One input terminal of the R gate 91 is supplied with power-on information DON from a power switch of the remote controller,
An image mute signal MUT from an image mute switch of the remote controller is provided to another input terminal, and an input switch signal ISW from an input switch of the remote controller is further provided to another input terminal.
Is given.

The power-on information DON rises to a high level when the power switch is turned on, and falls to a low level again after a certain period. The image mute signal MUT rises to a high level during the image mute period, and falls to a low level after the end of the image mute period. The input switching signal ISW rises to a high level for a certain period when the video signal is switched, and then falls to a low level.

The output signal of OR gate 91 is applied to MPU 90. The MPU 90 responds to the fall of the output signal of the OR gate 91 by using the initial setup control signal ST.
To the initial setup voltage conversion circuit 80.

In this embodiment, the discharge control timing generation circuit 5 constitutes a non-display period setting means, and the switching circuit 92
Constitute video signal input means.

FIG. 10 is a waveform diagram showing drive voltages and initial setup control signals applied to the address electrodes and the scan electrodes after the image mute period. In FIG. 10, the drive voltage applied to the scan electrodes 12 for m lines is shown as the drive voltage for one scan electrode 12. Here, m is the number of lines on one screen of PDP1.

At the end of the image mute period, the initial setup control signal ST rises from a low level to a high level. Thereby, the bias of the address electrode 11 rises to a predetermined setup potential SV. The voltage waveform applied to the address electrode 11 and the scan electrode 12 during the initial setup period and the normal operation period is the same as the voltage waveform shown in FIG.

After the video signal is switched by the input switching signal ISW, the initial setup control signal ST
Rises from low level to high level. Thereby, the bias of the address electrode 11 rises to a predetermined setup potential SV.

FIG. 11 is a circuit diagram showing a configuration of initial setup voltage conversion circuit 80 of FIG.

Referring to FIG. 11, buffer circuits 87, 88
Is supplied with an initial setup control signal ST from the MPU 90. Buffer circuit 87 applies control signal GP to the gate of P-channel transistor TP in response to initial setup control signal ST. On the other hand, the buffer circuit 88
Supplies control signal GN to the gate of N-channel transistor TN in response to initial setup control signal ST.
The operation of the initial setup voltage conversion circuit ATU in FIG. 11 is the same as the operation of the initial setup voltage conversion circuit 80 in FIG.

In the plasma display device of this embodiment, the initial setup period is set after a certain period of time has elapsed since the power was turned on, and also after the end of the image mute period and after the switching of the video signal.

In the initial setup period, since negative wall charges are formed on the address electrodes 11 of the discharge cells of the entire screen, the stability of the address discharge is improved.

Further, the voltage amplitude VA of the write pulse Pwa can be reduced after a certain period of time has elapsed since the power was turned on, after the image mute period ends, and during the normal operation period after the switching of the video signal. Thereby, the charge / discharge current of the address electrode 11 can be reduced, and power saving can be achieved.

Further, since a wall charge is formed in each discharge cell after a lapse of a predetermined time from power-on, after an image mute period ends, and in an initial setup period after video signal switching, the scan electrode 12 and the sustain electrode 13 are formed.
Can be reduced.

In the above embodiment, the drive voltage applied to the address electrode 11 during the initial setup period is increased by the setup potential SV. However, the drive voltage applied to the scan electrode 12 during the initial setup period is decreased by the setup potential. Is also good.

[0154]

According to the display device and the method of driving the same according to the present invention, since the wall charges are formed in the plurality of discharge cells before the normal operation period, the discharge stability of the discharge cells during the normal operation period is improved. And the pulse voltage for starting discharge can be set low. Therefore, stabilization of discharge and power saving are achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a plasma display device according to an embodiment of the present invention.

FIG. 2 is a view mainly showing P of the plasma display device of FIG. 1;
Block diagram showing the configuration of the DP

FIG. 3 is a block diagram showing an initial setup voltage conversion circuit connected to an address driver and its peripheral circuits;

FIG. 4 is a timing chart showing a drive voltage applied to each electrode of the PDP of FIG. 2 during a normal operation period;

FIG. 5 is a waveform diagram showing a drive voltage and an initial setup control signal applied to an address electrode and a scan electrode when power is turned on.

FIG. 6 is a circuit diagram showing a configuration of an initial setup voltage conversion circuit.

FIG. 7 is a voltage waveform diagram showing the operation of the initial setup voltage conversion circuit of FIG.

FIG. 8 is a block diagram showing a configuration of a plasma display device according to another embodiment of the present invention.

9 is a block diagram showing an initial setup voltage conversion circuit connected to an address driver of the plasma display device of FIG. 8 and its peripheral circuits.

FIG. 10 is a waveform chart showing a drive voltage applied to an address electrode and a scan electrode after an image mute period and an initial setup control signal.

FIG. 11 is a circuit diagram showing a configuration of an initial setup voltage conversion circuit of FIG. 8;

FIG. 12 is a diagram illustrating a method for driving a discharge cell in an AC PDP.

FIG. 13 is a schematic diagram mainly showing a configuration of a PDP of a conventional plasma display device.

FIG. 14 is a schematic cross-sectional view of a three-electrode surface discharge cell in an AC type PDP.

FIG. 15 is a diagram for explaining the ADS method.

FIG. 16 is a diagram for explaining an address / sustain simultaneous driving method;

FIG. 17 is a timing chart showing a drive voltage of each electrode according to a conventional simultaneous address and sustain drive method.

FIG. 18 is a waveform chart showing a drive voltage of an address electrode when power is turned on in the conventional address / sustain simultaneous driving method.

[Explanation of symbols]

 Reference Signs List 1 PDP 2 Address driver 3 Scan driver 4 Sustain driver 5 Discharge control timing generation circuit 11 Address electrode 12 Scan electrode 13 Sustain electrode 80 Initial setup voltage conversion circuit 81, 82, 83 Power supply circuit 85, 86 Control signal generation circuit 90 MPU 91 OR Gate 92 Switching circuit TP P-channel transistor TN N-channel transistor C1, C2 Capacitor D1, D2 Diode Pwa, Pw Write pulse Psc Sustain pulse Psu Sustain pulse SV Initial setup potential ST Initial setup control signal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masanori Nakatsuji 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Junpei Hashiguchi 1006 Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 5C080 AA05 BB05 DD04 DD09 DD26 EE28 FF12 GG08 HH05 JJ02 JJ04 JJ05

Claims (26)

[Claims] 1. A plurality of discharge cells, wall charge forming means for applying a wall voltage forming pulse voltage to the plurality of discharge cells during a predetermined period after power-on, and light emission according to image data during a normal operation period A discharge cell selecting means for selectively applying a pulse voltage for starting discharge to a discharge cell to be caused to discharge. 2. The display device according to claim 1, wherein the pulse voltage for forming the wall charge is higher than the pulse voltage for starting the discharge. 3. The display device according to claim 1, wherein the predetermined period after power-on is set after a lapse of a predetermined time from power-on. 4. The wall charge generating means generates the pulse voltage for forming the wall charge by applying a predetermined bias voltage to the discharge cell selecting means during the predetermined period after power is turned on. The display device according to claim 1, 2 or 3. 5. The wall charge forming means includes: first voltage generating means for applying a power supply voltage to the discharge cell selecting means; second voltage generating means for generating a bias voltage; and the predetermined period after power-on. 5. A superimposing means for superimposing a bias voltage generated by said second voltage generating means on a power supply voltage generated by said first voltage generating means. The display device according to the above. 6. The superimposing means has one and other terminals, holding means for holding a power supply voltage generated by the first voltage generating means at the one terminal, and holding means for holding the power supply voltage during a normal operation period. Switching means for connecting the other terminal of the means to a reference potential and connecting the other terminal of the holding means to a bias voltage generated by the second voltage generating means during the predetermined period after power-on. The display device according to claim 1, further comprising: 7. A non-display period setting unit that sets a non-display period of an image by simultaneously stopping light emission of the plurality of discharge cells at an arbitrary timing, wherein the wall charge forming unit is configured to perform the non-display period. The display device according to any one of claims 1 to 6, wherein the pulse voltage for forming the wall charges is applied to the plurality of discharge cells during a predetermined period after the end of the non-display period by the setting unit. 8. A video signal input means for selectively inputting any one of a plurality of video signals, wherein the discharge cell selecting means responds to image data based on the video signal input by the video signal input means. The discharge start pulse voltage is selectively applied to the discharge cells to be caused to emit light, and the wall charge forming unit applies the pulse voltage to the plurality of discharge cells for a predetermined period after switching of the video signal by the video signal input unit. The display device according to claim 1, wherein a pulse voltage for forming wall charges is applied. 9. A plurality of first electrodes arranged in a first direction, and a plurality of second electrodes arranged in the first direction so as to be paired with the plurality of first electrodes, respectively. And a plurality of third electrodes arranged in a second direction intersecting the first direction; and a plurality of third electrodes arranged in a second direction intersecting the first direction. A plurality of discharge cells provided at the intersection; a wall charge forming means for applying a pulse voltage for forming a wall charge to the plurality of third electrodes during a predetermined period after power-on; And a discharge cell selecting means for selectively applying a pulse voltage for starting discharge to the corresponding third electrode. 10. A first voltage applying means for periodically applying a first pulse voltage to the plurality of first electrodes, and a second voltage applying means for starting a light emitting period set for each second electrode. And a second voltage applying means for periodically applying a second pulse voltage to the second electrode after applying a writing pulse voltage to the second electrode. The discharge cell selecting means further comprises: 10. The display device according to claim 9, wherein the pulse voltage for starting the discharge is applied to the corresponding third electrode in synchronization with a write pulse voltage generated by a voltage application unit. 11. The display device according to claim 9, wherein the pulse voltage for forming wall charges is higher than the pulse voltage for starting discharge. 12. The method according to claim 12, further comprising a sub-field dividing unit for temporally dividing each field set for each second electrode into a plurality of sub-fields and setting a light emission period for each sub-field, 11. The apparatus according to claim 9, wherein the means applies the pulse voltage for starting discharge to a third electrode corresponding to the start of the light emission period set in each subfield by the subfield dividing means. 1
The display device according to 1. 13. A non-display period setting unit for setting a non-display period of an image by simultaneously stopping light emission of the plurality of discharge cells at an arbitrary timing; The display device according to any one of claims 9 to 12, wherein the pulse voltage for forming the wall charges is applied to the plurality of third electrodes during a predetermined period after the end of the non-display period by the setting unit. . 14. A video signal input means for selectively inputting any one of a plurality of video signals, wherein said discharge cell selection means responds to image data based on the video signal input by said video signal input means. And selectively applying the discharge start pulse voltage to the corresponding third electrode, wherein the wall charge forming unit is configured to switch the plurality of third electrodes during a predetermined period after switching of the video signal by the video signal input unit. The display device according to claim 9, wherein the pulse voltage for forming the wall charge is applied to an electrode. 15. A method of driving a display device having a plurality of discharge cells, wherein a pulse voltage for forming wall charges is applied to the plurality of discharge cells during a predetermined period after power-on, and an image is displayed during a normal operation period. A method of driving a display device, characterized by selectively applying a pulse voltage for starting discharge to a discharge cell to emit light according to data. 16. The method according to claim 15, wherein the pulse voltage for forming the wall charges is higher than the pulse voltage for starting the discharge. 17. The method according to claim 15, wherein the predetermined period after power-on is set after a lapse of a predetermined time from power-on. 18. The wall voltage forming pulse voltage according to claim 15, wherein the pulse voltage for forming the wall charge is generated by superimposing a constant voltage on the pulse voltage for starting the discharge during the predetermined period after the power is turned on. 18. The method for driving a display device according to item 17. 19. A pulse for forming the wall charges in the plurality of discharge cells during a predetermined period after a non-display period of an image set by simultaneously stopping light emission of the plurality of discharge cells at an arbitrary timing. The method for driving a display device according to claim 15, wherein a voltage is applied. 20. A pulse signal for selectively starting to input one of a plurality of video signals and applying the pulse voltage for starting discharge to a discharge cell to emit light in accordance with image data based on the input video signal. 20. The method according to claim 15, wherein the pulse voltage for forming the wall charges is applied to the plurality of discharge cells during a predetermined period after the switching of the video signal. 21. A plurality of first electrodes arranged in a first direction, and a plurality of second electrodes arranged in the first direction so as to be paired with the plurality of first electrodes, respectively. A plurality of third electrodes arranged in a second direction intersecting the first direction; the plurality of first electrodes; and the plurality of second electrodes.
And a plurality of discharge cells provided at intersections of the plurality of third electrodes, wherein a wall charge is applied to the plurality of third electrodes for a predetermined period after power-on. A driving method for a display device, comprising applying a pulse voltage for formation and selectively applying a pulse voltage for starting discharge to a corresponding third electrode according to image data during a normal operation period. 22. A first pulse voltage is periodically applied to the plurality of first electrodes, and a write pulse voltage is applied to the second electrodes at the start of a light emission period set for each second electrode. After applying the pulse voltage, a second pulse voltage is periodically applied to the second electrode, and the discharge start pulse voltage is applied to the corresponding third electrode in synchronization with the write pulse voltage. The method of driving a display device according to claim 21, wherein 23. The method according to claim 21, wherein the pulse voltage for forming the wall charge is higher than the pulse voltage for starting the discharge. 24. Each field set for each second electrode is temporally divided into a plurality of subfields, a light emission period is set for each subfield, and the light emission period for each of the subfields is set. 24. The method of driving a display device according to claim 21, wherein the pulse voltage for starting the discharge is applied to a third electrode corresponding to the start. 25. The method according to claim 25, further comprising simultaneously stopping light emission of the plurality of discharge cells at an arbitrary timing, and setting the plurality of third electrodes to the plurality of third electrodes for a predetermined period after the end of a non-display period of an image. The method according to any one of claims 21 to 24, wherein the pulse voltage is applied. 26. One of a plurality of video signals is selectively input, and the discharge start pulse voltage is selectively applied to a corresponding third electrode in accordance with image data based on the input video signal. 26. The method according to claim 21, wherein the pulse voltage for forming the wall charges is applied to the plurality of third electrodes during a predetermined period after the switching of the video signal. .