KR20070076777A - Method for compensating temperature of plasma display panel using discharge history and plasma display apparatus - Google Patents

Abstract

A method for compensating for the temperature of a plasma display panel using discharge history and a plasma display device are provided to extend the lifespan of the PDP by accurately monitoring overall or local heating of the PDP(Plasma Display Panel). A plasma display device includes a PDP(10), driving circuits(20,30,40), a history extracting unit(60), and a controller(50). Plural discharge cells are formed on the PDP. The driving circuits drive the discharge cells on the PDP according to a predetermined driving voltage and display an image. The history extracting unit extracts discharge history of at least a portion of the discharge cells, according to the image data which is displayed during a predetermined time period. The controller controls the driving circuits according to the discharge histories and regulates the driving voltage.

Description

Temperature Compensation Method and Plasma Display Device of Plasma Display Panel Using Discharge History {METHOD FOR COMPENSATING TEMPERATURE OF PLASMA DISPLAY PANEL USING DISCHARGE HISTORY AND PLASMA DISPLAY APPARATUS}

1 is an exploded perspective view showing the structure of a conventional three-electrode AC surface discharge type PDP.

2 illustrates a driving voltage waveform applied to each electrode during each subfield.

3 exemplarily shows a configuration of a subfield arranged for gradation representation during a 1TV field in the plasma display panel.

4 is a block diagram showing a preferred embodiment of the plasma display device of the present invention.

5 illustrates a configuration of a controller 50 according to an embodiment of the present invention.

6 and 7 illustrate the placement of the reference area set on the panel 10.

8 is a view showing a processing flow in one embodiment of the temperature compensation method of the present invention.

FIG. 9 is a diagram for exemplarily describing a waveform changing action of each of the driving units 20, 30, and 40 according to the driving waveform change signal of the controller 50.

Figure 10 illustrates a block diagram of a configuration of one embodiment of the present invention such that the drive waveform is adjusted according to accumulated discharge on / off history data.

11-15 exemplarily illustrate various driving waveform changing schemes that can be used for the implementation of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature compensation method and a plasma display apparatus of a plasma display panel using a discharge history. More particularly, the present invention relates to a discharge for a predetermined period for each discharge cell or region, which is a fundamental factor of local or global temperature rise of a panel. The present invention relates to a temperature compensation method and a plasma display apparatus of a plasma display panel for extracting data quantifying a frequency or a discharge time relatively and controlling temperature of a panel according to the data to enable temperature compensation.

Plasma display devices ('Plasma Display Apparatus', 'Plasma Display Device' or 'Plasma Display Panel') are display devices using a phenomenon in which visible light is generated when ultraviolet rays generated by gas discharge excite phosphors. Plasma display devices have the advantages of being thinner and lighter than the cathode ray tube (CRT) and enabling high-definition and large screens. In general, a plasma display panel (hereinafter referred to as a 'PDP') includes a plurality of discharge cells arranged in a matrix form, and one discharge cell corresponds to one subpixel of a screen.

1 is an exploded perspective view showing the structure of a conventional three-electrode AC surface discharge type PDP. Referring to FIG. 1, each discharge cell has a scan electrode Y formed on the upper substrate 1, a sustain electrode Z, and an address electrode X formed on the lower substrate 9. The scan electrode (Y) and the sustain electrode (Z) are usually made of a transparent conductive film material such as patterned indium-tin-oxide (Indium-Tin-Oxide), in order to reduce the voltage drop due to their high resistance characteristics Bus electrodes 3 made of a metal such as chromium (Cr) are generally formed thereon.

The upper dielectric layer 4 and the passivation layer 5 are stacked on the upper substrate 1 having the scan electrode Y and the sustain electrode Z side by side. The protective film 5 is usually made of magnesium oxide (MgO) in order to prevent damage to the upper dielectric layer 4 by sputtering generated during plasma discharge and to improve emission efficiency of secondary electrons.

The lower dielectric layer 8 and the partition wall 6 are formed on the lower substrate 9 on which the address electrode X is formed, and the phosphor 7 is coated on the surfaces of the lower dielectric layer 8 and the partition wall 6. The address electrode X is formed in a direction perpendicular to the scan electrode Y and the sustain electrode Z, and the partition wall 6 is formed in a direction parallel to the address electrode X to generate ultraviolet and visible light generated by discharge. This prevents leakage to adjacent discharge cells. The phosphor 7 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B). In the discharge space provided by the upper substrate 1, the lower substrate 9, and the partition wall 6, Ne + Xe and a penning gas for gas discharge are usually enclosed.

In order to drive the AC PDP having the above-described structure, as shown in FIG. Each subfield is composed of a reset period (or an initialization period), an address period (or a write period), and a discharge sustain period. For example, each of the subfields has a length of discharge sustain periods corresponding to 2 ⁰ , 2 ¹ , 2 ² , 2 ³ , 2 ⁴ , 2 ⁵ , 2 ⁶ , 2 ⁷ , It is possible to express gradations (for example, 256 = 2 ⁸ ) to be implemented in combination.

During each subfield, a driving voltage waveform as shown in FIG. 2 is applied to each electrode. During the reset period, the lamp reset waveform Prst is applied to uniform the wall voltage state of the discharge cells of the panel, and during the address period, the scan line to input the data is selected by the scan pulse Pscn and simultaneously applied. Data is written line by line by the address pulse Pad. The discharge on / off during the corresponding subfield in the corresponding discharge cell on the panel is determined depending on whether data is written or not. ON / OFF during each subfield in the corresponding discharge cell is determined by a preset correspondence in accordance with the video data during the 1TV field. When an address discharge occurs in the corresponding discharge cell due to the voltage difference between the address pulse Pad and the scan pulse Pscn in the corresponding subfield, the wall voltage is accumulated in the corresponding discharge cell, and data is written, thereby continuing the sustain period. In the sustain pulse Psus, the sustain pulse Psus is applied between the sustain electrode and the scan electrode so that only the discharge cells to which data is written generate sustain discharge. After the sustain discharge, if necessary, an erase pulse of a predetermined voltage Ve may be further added to make the discharge cells more uniform.

The discharge is continuously generated in the discharge cell of the panel, and when heat generated in the discharge process is accumulated, the local or overall temperature rise of the panel is caused. The temperature rise of the discharge cells may cause problems such as misfiring, miswriting or afterimage.

In order to compensate for the problems caused by the temperature rise, a general plasma display apparatus adopts a method of sensing a temperature by mounting a temperature sensor at an appropriate position such as a rear surface of a panel or a support frame. However, the temperature measurement method is not a method that directly reflects the situation of each discharge cell of the panel, and thus the accuracy thereof is limited, and the temperature sensor can be attached only to a limited part of the panel, so the situation of each area of the panel is different. Since it is difficult to grasp the problem, there is a limit that the actual situation occurring in each discharge cell cannot be reflected in the driving of the plasma display panel in real time.

Disclosure of Invention The present invention is to overcome the above-mentioned problems, and does not rely on a temperature sensor, and provides data quantifying the discharge frequency or discharge time for a predetermined period of time for each discharge cell or region, which is a fundamental factor of local or global temperature rise of the panel. The present invention provides a temperature compensation method and a plasma display apparatus of a plasma display panel which enable temperature compensation by extracting and controlling a driving voltage waveform of the panel according to the data.

In addition, the present invention is to provide a temperature display method and a plasma display device of the plasma display panel that accurately reflects the overall or local heating situation of the panel over time to compensate for this.

Furthermore, the present invention provides a method for compensating a temperature of a plasma display panel and a plasma display apparatus for monitoring a temperature rise situation of each discharge cell, region, or the entire panel by analyzing image data provided to the plasma display panel. It is for.

A plasma display device according to a first aspect of the present invention for achieving the above object, the plasma display panel having a plurality of discharge cells; A driving circuit unit driving the discharge cells on the plasma display panel to display an image so as to correspond to a predetermined driving voltage waveform; A history extraction unit for extracting a discharge on / off history according to the displayed image data for a predetermined period of at least some of the discharge cells; And a controller configured to adjust the driving voltage waveform by controlling the driving circuit unit according to the discharge on / off history.

Here, the at least some discharge cells are those that exist in a predetermined area on a display screen of the plasma display panel, and the history extractor records the discharge on / off history of the discharge cells that exist in the predetermined area. It may be to extract.

In order to extract the discharge on / off history, the history extraction unit may be used in various ways. For example, the display screen of the plasma display panel may be divided into a plurality of areas to belong to at least some of the areas. Extracting the discharge on / off histories for the discharge cells, extracting the discharge on / off history for the entire display screen of the plasma display panel, or sampling a plurality of discharge cells of the plasma display panel. A method of extracting the discharge on / off history for the number of discharge cells may be used.

In addition, the history extraction unit, to extract the discharge on / off history, it is possible to know the degree of temperature rise quantitatively by accumulating the displayed image data for the predetermined period for the discharge cells of the at least some region. In this case, the accumulation and reset of the image data may be repeated to monitor the temperature rising state according to the predetermined period unit.

Further, the discharge on / off history is configured to be related to the ratio of the on time to the time when the at least some discharge cells were off during the predetermined period, and used as a quantitative parameter indicating the degree of temperature rise in the region. It is also possible.

Herein, when the discharge on / off history value exceeds a predetermined reference value, the controller may recognize that the plasma display panel is at a high temperature and adjust the driving voltage waveform, but only for a portion of the panel. It is also possible to carry out the treatment. In this case, the controller may adjust the driving voltage waveform by using the discharge on / off history as a feedback value.

The control unit may recognize that the discharge on / off history value is higher and change the driving voltage waveform so as to alleviate it, and adjust the slope of the reset waveform among the driving waveforms to be lowered, or adjust the reset waveform. Adjust to lower the peak voltage level, reduce the rise and / or fall time of the reset waveform, adjust to reduce the number of reset pulses per unit frame, adjust to reduce the number of sustain pulses, or reset interval Various driving voltage waveform adjustment schemes may be used, such as adjusting the minimum voltage level of the signal to be high, adjusting the width of the sustain pulse to be large, or adjusting the voltage level of the sustain pulse to be low.

According to a second aspect of the present invention, there is provided a plasma display apparatus comprising: a plasma display panel having a plurality of discharge cells; A driving circuit unit driving the discharge cells on the plasma display panel to display an image so as to correspond to a predetermined driving voltage waveform; A history extraction unit for accumulating image data values displayed for a predetermined period of at least some of the discharge cells; And a controller configured to control the temperature of the plasma display panel by adjusting the driving voltage waveform by using the accumulated image data value as a feedback value.

According to a third aspect of the present invention, there is provided a plasma display apparatus comprising: a plasma display panel having a plurality of discharge cells; A driving circuit unit which displays an image by driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform; A history extraction unit for accumulating image data values displayed for a predetermined period of at least some of the discharge cells; And a controller configured to determine whether the partial region of the plasma display panel is at a high temperature based on the image data values accumulated for the predetermined period.

A temperature compensation method of a plasma display panel according to a fourth aspect of the present invention includes driving a plasma display panel having a plurality of discharge cells and driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform to display an image. A temperature compensation method performed in a plasma display device having a driving circuit unit, the method comprising: extracting a displayed discharge on / off history for a predetermined period of at least some of the discharge cells; And adjusting the driving voltage waveform by controlling the driving circuit unit according to the discharge on / off history for the predetermined period.

A temperature compensation method of a plasma display panel according to a fifth aspect of the present invention includes driving a plasma display panel having a plurality of discharge cells and driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform to display an image. A temperature compensation method performed in a plasma display device having a driving circuit unit, the method comprising: accumulating image data displayed for a predetermined period on at least some of the discharge cells; And adjusting the driving voltage waveform by using the accumulated image data value as a feedback value.

A temperature compensation method of a plasma display panel according to a sixth aspect of the present invention includes driving a plasma display panel having a plurality of discharge cells and driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform to display an image. A temperature compensation method performed in a plasma display device having a driving circuit unit, the method comprising: accumulating image data displayed for a predetermined period on at least some of the discharge cells; And determining whether the at least some region of the plasma display panel is at a high temperature based on the image data values accumulated for the predetermined period.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing a preferred embodiment of the plasma display device of the present invention. The illustration which is not necessary in description of this invention was abbreviate | omitted. The illustrated plasma display device includes a plasma display panel 10, a plurality of sustain electrodes Z ₁ , Z ₂ ,... _N , and a plurality of scan electrodes Y ₁ , Y ₂ formed in the panel 10. , ... _{n n} ) and the sustain electrode driver 30, the scan electrode driver 20, and the address electrode driver 40 driving the plurality of address electrodes X ₁ , X ₂ , ... X _n , respectively. Include. In addition, a control unit 50 for outputting a control signal to each of the driving units 20, 30, and 40 according to the image data is provided.

The input image data is converted into a form suitable for display on the plasma display panel 10 through a process such as gamma correction and error diffusion in the image processing unit 80, and the control unit 50 and the driving circuit unit 20, 30, 40. ) Is displayed as an image on the plasma display panel 10.

Meanwhile, the history extractor 60 analyzes the image data to extract discharge on / off history for a predetermined reference region on the panel. For example, the history extractor 60 may be configured to extract, on at least some of the discharge cells on the panel 10, discharge on / off histories according to the displayed image data for a predetermined period of time. The data extracted by the history extraction unit 60 is transferred to the control unit 50 and used to adjust the driving waveform to compensate for the temperature of the panel 10.

The discharge on / off history data may be in various forms, quantifying the discharge frequency, the discharge duration, or the like for a predetermined period which directly contributes to the temperature rise of the corresponding reference region on the panel 10, thereby releasing the panel by the discharge. Refers to the data defined to predict the degree of temperature rise in (10). For example, accumulate image data values input for a predetermined period of time with respect to the reference area set on the panel 10, obtain and accumulate APL (average image level) for the corresponding area, or maintain subfields with discharge on. A value defined to relatively represent the difference in discharge frequency or duration, such as accumulating the number of pulses, is sufficient. In addition to the parameters illustrated above, various types of parameters may be defined.

For example, it may be possible to calculate the ratio of the time when the predetermined discharge cell is turned off during the predetermined period and use the value as discharge on / off history data of the corresponding discharge cell. A plurality of discharge cells constituting a predetermined region may be averaged or summed to estimate the degree of temperature rise in the region. The specific calculation method or region designation method of the discharge on / off history data may be variously modified by those skilled in the art in addition to the above-described methods.

6 and 7 illustrate a reference area set on panel 10. As illustrated in FIG. 6, the reference area set on the panel 10 divides the screen of the panel 10 into a plurality of areas 110, and displays image data input to discharge cells corresponding to each area. Processing to obtain the discharge on / off history data for each area, without discharging the data for the entire panel 10, and obtains the discharge on / off history data for each area for several designated areas as shown in FIG. You can also

In addition, the discharge on / off history data is obtained for only a plurality of discharge cells sampled in the reference region without obtaining discharge on / off history data for all the discharge cells in the reference region to represent the temperature trend of the reference region. It can also be used as a value. If necessary, the reference area may be the entire panel.

5 illustrates a configuration of a controller 50 according to an embodiment of the present invention. Parts unnecessary for the description of the present invention are omitted. The compensator 54 in the illustrated control unit 50 generates the converted drive signal to change the drive waveform with reference to the discharge on / off history data provided from the history extraction unit 60, and each drive unit 20, 30. , 40). The storage unit 52 stores discharge on / off history data corresponding to a predetermined reference area set on the panel 10. The discharge on / off history data is a value accumulated based on a predetermined period according to the transition of the image data, and if necessary, the discharge on / off history data may be reset and accumulated again. This reset action is performed so that the discharge on / off history data can accurately represent the actual discharge cell temperature when continuous data accumulation is unnecessary or incorrect, such as when the plasma display device is turned off and then turned on again. It is to.

If necessary, the temperature compensation function with reference to the discharge on / off data of the present invention in parallel with the temperature sensor installed in the rear panel as in the prior art may be configured to be performed together.

The degree of temperature increase of the discharge on / off history data obtained and how much the driving waveform should be changed accordingly can be referred to a look-up table obtained through experiments or the like. have. More specifically, since the discharge on / off history data is a value for relative comparison of the discharge frequency or duration, which is a direct cause of the temperature increase in each reference region of the panel, the absolute temperature value change is based on the discharge on / off history data. In order to know whether or not it is appropriate to change the driving waveform, a method such as a preliminary experiment may be used, and the results of the preliminary experiment are stored in the device in the form of a look-up table and controlled by the controller 50. It can be used as a database for.

8 is a view showing a processing flow in one embodiment of the temperature compensation method of the present invention.

The image data signal input for each TV field is analyzed (S10), and data for each reference region on the panel 10 is extracted (S20). Convert the obtained data into a format suitable for processing into discharge on / off history data values (suitable data processing such as normalization can be performed), accumulate the converted data values (S30), and increase the timer value ( S40).

The timer value is compared with the set reference value to determine whether the predetermined reference time has elapsed (S50). Otherwise, the above-described processing is repeated for the video data of the next TV field. At this time, when the predetermined reference time has elapsed, the accumulated data value is output as the discharge on / off history data value (S60), and the degree of temperature increase of the corresponding area is predicted by referring to the look-up table generated by a preliminary experiment. Alternatively, or after determining the degree of change of the driving voltage waveform, the driving voltage waveform is changed based on the result (S80). After the above processing, the timer is reset, and the discharge on / off history data values accumulated for the previous period are reset (S90), and the processing for the next time interval is performed again.

FIG. 9 is a diagram for exemplarily describing a waveform changing action of each of the driving units 20, 30, and 40 according to the driving waveform change signal of the controller 50. The illustrated circuit shows only a part of the scan driving circuit 20, and is composed of the fifth, sixth and seventh switching elements S5, S6, and S7, and the first resistor R1 and the capacitor Ca. The waveform generator 25 is illustrated. The illustrated reset waveform generator 25 is a circuit for generating a ramp reset waveform as shown in FIG. 2. It is known that the continuous weak discharge is generated by the lamp reset waveform generated here, so that the discharge cells of all panels have a uniform wall charge distribution.

For example, the rising slope of the ramp reset waveform may be controlled by adjusting the size of the variable resistor R1. In addition, the duration of the rising section of the ramp reset waveform can be adjusted by changing the on time of the switching signal input to the gate terminal of the sixth switching element S6. On the other hand, the maximum voltage (Vsetup) of the lamp reset waveform can be changed by the Vsetup supply (not shown) that supplies it. As described above, the rising slope (or falling slope), the maximum voltage, the rise time, and the like of the lamp reset waveform can all be appropriately controlled.

9 illustrates a method of adjusting the rise time by controlling the width of the gate signal. In general, the ramp reset waveform continues rising during the gate turn-on time of the sixth switch S6. In the related art, the gate turn-on time is usually fixed at every subfield or every frame. However, in the present invention, the gate signals g1 and g2 are differentially inputted by dividing the low temperature condition (the condition where the panel temperature is low and other side effects are not concerned even if sufficient reset is performed) and the high temperature condition, so that the rise time even at the same rising slope. A way of controlling to vary is proposed.

In this way, it is possible to change the rise time without changing the duration of the entire lamp reset waveform, so that the lamps can be changed without significantly changing the drive circuit configuration or significantly changing the switching signal scheme for the drive switches. The reset waveform can be easily controlled.

Figure 10 illustrates a block diagram of a configuration of one embodiment of the present invention such that the drive waveform is adjusted according to accumulated discharge on / off history data. As illustrated, when the discharge on / off history data is extracted and accumulated in the history extractor 60, the comparator 56 in the controller 50 compares the output value with a predetermined reference value Vref1. In accordance with the difference, it is determined whether it is a high temperature condition or a low temperature condition, and the drive signal generation unit 58 generates a control signal according to the Vsetup supply unit 27 or the reset waveform generation unit 25 provided in the reset driving circuit. Can provide.

The drive signal generated by the drive signal generator 58 is an appropriate component in the drive circuit depending on which parameter (rising slope or falling slope of the lamp reset waveform, gate turn-on time, Vsetup magnitude, etc.) to be controlled is selected. Delivered.

11-15 exemplarily illustrate various driving waveform changing schemes that can be used for the implementation of the present invention. The driving waveform changing method illustrated in FIG. 11 is a case where the magnitude of the ramp reset waveform Prst is changed. If it is determined that the reference region of the panel is low temperature according to the obtained discharge on / off history data, the size of the lamp reset waveform Prst (Vset1) is sufficient as shown in (a), so that it is sufficient for all the discharge cells on the panel. Allow initialization to be performed. However, if it is determined that the reference region of the panel is high temperature, excessive reset can sustain the temperature rise and cause other side effects, so that the magnitude Vset2 of the lamp reset waveform Prst is reduced as shown in (b). .

The driving waveform changing method illustrated in FIG. 12 is a case where the magnitude of the highest voltage Vset1 of the ramp reset waveform Prst is changed. If it is determined that the reference region of the panel is low temperature according to the obtained discharge on / off history data, the maximum voltage Vset1 of the lamp reset waveform Prst is sufficiently high as shown in (a), so that all discharge cells on the panel Allow enough initialization to be performed. However, if it is determined that the reference region of the panel is high temperature, excessive reset may continue to rise in temperature and cause other side effects, so as shown in (b), the maximum voltage magnitude Vset3 of the lamp reset waveform Prst is changed. Make it small.

The driving waveform changing method illustrated in FIG. 13 is a case of changing the number of ramp reset waveforms Prst in a unit subfield or a 1TV field. If it is determined that the reference region of the panel is low temperature according to the obtained discharge on / off history data, the number of lamp reset waveforms Prst is sufficient as shown in (a), and sufficient initialization of all the discharge cells on the panel is performed. To be possible. However, if it is determined that the reference region of the panel is high temperature, excessive reset may continue to raise the temperature and cause other side effects, so that the number of lamp reset waveforms Prst is reduced as shown in (b).

In order to alleviate the temperature rise by adjusting the reset waveform, a method of adjusting such that the lowest voltage level (voltage before the ramp rise) of the reset section may be used in addition to those listed above.

The driving waveform changing method illustrated in FIG. 14 is a case where the number of the sustain pulses Psus1 in the unit subfield or the 1TV field is changed. If it is determined that the reference region of the panel is low temperature according to the obtained discharge on / off history data, the number of sustain pulses Psus1 is sufficient as shown in (a) so that the image on the panel can have sufficient luminance. However, if it is determined that the reference region of the panel is a high temperature, excessively high luminance may continue to rise in temperature and cause other side effects, so that the number of sustain pulses Psus2 is reduced as shown in (b). Alternatively, a method may be used such that the duty ratio of the sustain pulses, not the number of sustain pulses, is reduced, or the width between the sustain pulses is increased.

The driving waveform changing method illustrated in FIG. 15 illustrates a case of changing data values in the 1TV field. If it is determined that the reference area of the panel is high temperature according to the discharge on / off history data obtained, excessively high luminance can cause the temperature rise to cause other side effects, so as shown in (b), the data value is lowered to reduce the Temperature is controlled by adjusting the frequency and duration to reduce. Such a method by changing the data is represented by changing the waveform of the address section when the same data is input. The change of data has an advantage that it can be differentially performed for each area or discharge cells of the panel without significantly changing the configuration of the present plasma display panel.

Preferred embodiments of the present invention described above are merely illustrative of the present invention, and the present invention may be variously modified from these examples and may take various forms. Therefore, the invention should not be construed as limited to the particular forms mentioned in the description, but includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood that.

According to the present invention, it is possible to extract data quantifying the discharge frequency or discharge time for a predetermined period of time for each discharge cell or region, which is a fundamental factor of the local or global temperature rise of the panel, without using a temperature sensor, and according to the data, Provided are a temperature compensation method and a plasma display apparatus of a plasma display panel which enable temperature compensation by controlling a driving voltage waveform.

In addition, according to the present invention, it is possible to accurately compensate for the overall or local heating situation of the plasma display panel with time.

Furthermore, according to the present invention, it is possible to accurately monitor the temperature rise of each discharge cell, region, or the entire panel by analyzing image data provided to the plasma display panel.

Claims (25)

A plasma display panel having a plurality of discharge cells; A driving circuit unit driving the discharge cells on the plasma display panel to display an image so as to correspond to a predetermined driving voltage waveform; A history extraction unit for extracting a discharge on / off history according to the displayed image data for a predetermined period of at least some of the discharge cells; And And a controller configured to adjust the driving voltage waveform by controlling the driving circuit unit according to the discharge on / off history. The method of claim 1, The at least some discharge cells exist in a predetermined area on a display screen of the plasma display panel, and the history extractor extracts the discharge on / off history of the discharge cells existing in the predetermined area. Plasma display device, characterized in that. The method of claim 1, The history extractor may divide the display screen of the plasma display panel into a plurality of regions and extract the discharge on / off histories for the discharge cells belonging to at least some of the regions, respectively. Device. The method of claim 1, And the history extractor extracts a discharge on / off history of the entire display screen of the plasma display panel. The method of claim 1, And the history extracting unit extracts discharge on / off histories of a plurality of sampled discharge cells among the plurality of discharge cells of the plasma display panel. The method of claim 1, And the history extracting unit accumulates image data displayed during the predetermined period of the discharge cells of the at least some region to extract the discharge on / off history. The method of claim 1, And the history extracting unit repeats accumulation and reset of the image data in order to monitor a temperature rising state according to the predetermined period unit. The method of claim 1, And the discharge on / off history is related to the ratio of the time when the at least some discharge cells were off to the time when the at least some discharge cells were off during the predetermined period. The method of claim 1, And when the discharge on / off history value exceeds a predetermined reference value, the controller recognizes that the plasma display panel is at a high temperature and adjusts the driving voltage waveform. The method of claim 1, And when the discharge on / off history value of the partial region exceeds a predetermined reference value, the controller recognizes that the local high temperature occurs in the plasma display panel and adjusts the driving voltage waveform. The method of claim 1, And the control unit adjusts the driving voltage waveform by using the discharge on / off history as a feedback value. The method of claim 1, And the control unit recognizes that the discharge on / off history value is high as the temperature is high, and changes the driving voltage waveform to mitigate this. The method of claim 1, And the control unit adjusts the slope of the reset waveform among the driving waveforms to be lower as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the highest voltage level of the reset waveform among the driving waveforms as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the rise and / or fall time of the reset waveform among the driving waveforms as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the number of reset pulses per unit frame in the driving waveform to be smaller as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the number of sustain pulses in the driving waveform to be smaller as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the lowest voltage level of a reset section of the driving waveform to be higher as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the width of the sustain pulse in the driving waveform to be larger as the discharge on / off history value is larger. The method of claim 1, And the control unit adjusts the voltage level of the sustain pulse in the driving waveform to be lower as the discharge on / off history value is larger. A plasma display panel having a plurality of discharge cells; A driving circuit unit driving the discharge cells on the plasma display panel to display an image so as to correspond to a predetermined driving voltage waveform; A history extraction unit for accumulating image data values displayed for a predetermined period of at least some of the discharge cells; And And a controller configured to control the temperature of the plasma display panel by adjusting the driving voltage waveform by using the accumulated image data value as a feedback value. A plasma display panel having a plurality of discharge cells; A driving circuit unit driving the discharge cells on the plasma display panel to display an image so as to correspond to a predetermined driving voltage waveform; A history extraction unit accumulating image data values displayed for at least some of the discharge cells for a predetermined period of time; And And a controller configured to determine whether the partial region of the plasma display panel is at a high temperature based on the image data values accumulated for the predetermined period. A temperature display method of a plasma display apparatus having a plasma display panel having a plurality of discharge cells and a driving circuit unit which displays an image by driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform. Extracting the displayed discharge on / off history for a predetermined period of time for at least some of the discharge cells; And And adjusting the driving voltage waveform by controlling the driving circuit unit according to the discharge on / off history for the predetermined period. A temperature display method of a plasma display apparatus having a plasma display panel having a plurality of discharge cells and a driving circuit unit which displays an image by driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform. Accumulating image data displayed for at least some of the discharge cells for a predetermined period of time; And And adjusting the driving voltage waveform by using the accumulated image data value as a feedback value. A temperature display method of a plasma display apparatus having a plasma display panel having a plurality of discharge cells and a driving circuit unit which displays an image by driving the discharge cells on the plasma display panel so as to correspond to a predetermined driving voltage waveform. Accumulating image data displayed for a predetermined period of time on at least some of the discharge cells; And And determining whether the at least some region of the plasma display panel is at a high temperature based on the image data values accumulated for the predetermined period.

Images