KR20100035472A - Plasma display apparatus and method for driving the same - Google Patents

Abstract

PURPOSE: A plasma display apparatus and a method for driving the same are provided to perform a reset discharge of a subfield by removing a subfield according to an average illuminance level. CONSTITUTION: A plasma display apparatus comprises a plasma display panel, a driving part, a temperature detection part(550), an APL operation unit(610), and a subfield controller(620). The plasma display panel comprises a plurality of scan electrodes, sustain electrodes, and a plurality of address electrodes. The driving unit supplies a driving signal to a driving electrode. The temperature detection unit detects the temperature of a panel. The APL operation unit computes the average brightness level per a unit frame of an image signal. The subfield controller removes one or more subfield among a plurality of subfields of the unit frame.

Description

Plasma display apparatus and method for driving same

The present invention relates to a plasma display apparatus and a driving method thereof, and more particularly, to a plasma display apparatus and a driving method thereof, in which a subfield is omitted according to a detected temperature and a calculated average luminance level.

The plasma display panel (hereinafter referred to as PDP) displays an image by excitation and emitting phosphors by vacuum ultraviolet rays (VUV) generated when the inert gas is discharged.

Such a PDP is not only large in size and thin in thickness, but also has a simple structure and is easy to manufacture, and has a high luminance and high luminous efficiency compared to other flat display devices. In particular, the AC surface-discharge type 3-electrode plasma display panel has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge to protect the electrodes from sputtering caused by the discharge.

The plasma display panel is time-divided into a reset period for initializing all cells, an address period for selecting cells, and a sustain period for causing display discharge in the selected cells in order to realize gray levels of an image. Driven.

On the other hand, when the plasma display panel is driven, the temperature around the panel may increase due to the discharge, thereby limiting the subsequent discharge.

SUMMARY In order to solve the above problems in the plasma display device, a technical object of the present invention is to provide a plasma display device and a driving method thereof in which a subfield is omitted according to the detected temperature and the calculated average brightness level. There is a purpose.

Plasma display device according to an embodiment of the present invention for solving the above problems, a plasma display panel having a plurality of scan electrodes and sustain electrodes formed on the upper substrate and a plurality of address electrodes formed on the lower substrate, On the basis of a driver for supplying a drive signal to the plurality of electrodes, a temperature detector for detecting the temperature of the panel, an APL calculator for calculating the average brightness level per unit frame of the input image signal, and based on the detected temperature and the average brightness level, And a subfield controller for omitting at least one of the plurality of subfields in the unit frame.

A plasma display device driving method according to an embodiment of the present invention for solving the above problems, the plasma having a plurality of scan electrodes and sustain electrodes formed on the upper substrate and a plurality of address electrodes formed on the lower substrate Detecting a temperature of the display panel, calculating an average luminance level per unit frame of the input image signal, and at least one subfield of the plurality of subfields in the unit frame according to the detected temperature and the calculated average luminance level. Omitting the step.

According to the present invention configured as described above, the subfield is omitted according to the detected temperature and the calculated average luminance level, so that the reset discharge can be stably performed in the next reset period of the subfield in which the discharge is not performed. In particular, when the detection temperature of the panel is high and the average luminance level is lower than or equal to the predetermined value, omitting the subfields prevents unstable priming due to high temperatures from affecting the next reset section. Thus, the reset discharge is stably performed. Furthermore, the timing margin in the unit frame can be ensured for the subfields omitted.

Hereinafter, a plasma display device and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating an embodiment of a structure of a plasma display panel.

As shown in FIG. 1, the plasma display panel includes a scan electrode 11, a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and the bus electrodes 11b and 12b. 12b) may be formed of a metal such as silver (Ag) or chromium (Cr) or a lamination of chromium / copper / chromium (Cr / Cu / Cr) or a lamination of chromium / aluminum / chromium (Cr / Al / Cr). have. The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 11c to absorb external light generated outside the upper substrate 10 to reduce reflection. A black matrix (BM, 15) is arranged that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10, the first black matrix 15 and the transparent electrodes 11a and 12a formed at positions overlapping the partition wall 21. And the second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be simultaneously formed and thus not physically connected. .

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, the lower dielectric layer 23 and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

Meanwhile, in one embodiment of the present invention, although the R, G and B discharge cells are shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe, and He + Ne + Xe for discharging may be injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

FIG. 2 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel are preferably arranged in a matrix form as shown in FIG. 2. The plurality of discharge cells are provided at the intersections of the scan electrode lines Y1 to Ym, the sustain electrode lines Z1 to Zm, and the address electrode lines X1 to Xn, respectively. The scan electrode lines Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrode lines Z1 to Zm may be driven simultaneously. The address electrode lines X1 to Xn may be driven by being divided into odd-numbered lines and even-numbered lines or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 2. For example, a dual scan method in which two scan electrode lines among the scan electrode lines Y1 to Ym are simultaneously scanned is possible. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down or left and right in the center portion of the panel.

3 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. The unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8 and a sustain section S1, ..., S8.

Here, according to an embodiment of the present invention, the reset period may be omitted in at least one of the plurality of subfields. For example, the reset period may exist only in the first subfield or may exist only in a subfield about halfway between the first subfield and all the subfields.

In each address section A1, ..., A8, a display data signal is applied to the address electrode X, and scan pulses corresponding to each scan electrode Y are sequentially applied.

In each of the sustain periods S1, ..., S8, a sustain pulse is alternately applied to the scan electrode Y and the sustain electrode Z to form wall charges in the address periods A1, ..., A8. Sustain discharge occurs in the discharge cells.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gradations, each subfield in turn has different sustains at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of pulses can be assigned. In order to obtain luminance of 133 gradations, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

The number of sustain discharges allocated to each subfield may be variably determined according to weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, a plasma display panel may be driven by dividing one frame into eight or more subfields, such as 12 or 16 subfields.

The number of sustain discharges allocated to each subfield can be variously modified in consideration of gamma characteristics and panel characteristics. For example, the gray level assigned to subfield 4 may be lowered from 8 to 6, and the gray level assigned to subfield 6 may be increased from 32 to 34.

4 is a timing diagram illustrating an embodiment of a drive signal for driving a plasma display panel.

The subfield is a wall formed by a pre-reset section and a pre-reset section for forming positive wall charges on the scan electrodes Y and negative wall charges on the sustain electrodes Z. It may include a reset section for initializing the discharge cells of the entire screen by using the charge distribution, an address section for selecting the discharge cells, and a sustain section for maintaining the discharge of the selected discharge cells. have.

The reset section includes a setup section and a setdown section. In the setup section, rising ramp waveforms (Ramp-up) are simultaneously applied to all scan electrodes to generate fine discharges in all discharge cells. Thus, wall charges are generated. In the set-down period, a falling ramp waveform (Ramp-down) falling at a positive voltage lower than the peak voltage of the rising ramp waveform (Ramp-up) is simultaneously applied to all the scan electrodes (Y), thereby eliminating discharge discharge in all the discharge cells. Generated, thereby eliminating unnecessary charges during wall charges and space charges generated by the setup discharges.

In the address period, a scan signal having a negative scan voltage Vsc is sequentially supplied to the scan electrode, and a positive data signal is applied to the address electrode X at the same time. The address discharge is generated by the voltage difference between the scan signal and the data signal and the wall voltage generated during the reset period, thereby selecting the cell. On the other hand, in order to increase the efficiency of the address discharge, a sustain bias voltage Vzb is applied to the sustain electrode during the address period.

During the address period, the plurality of scan electrodes Y may be divided into two or more groups, and scan signals may be sequentially supplied to each group. Each of the divided groups may be further divided into two or more subgroups. Scan signals may be supplied sequentially. For example, the plurality of scan electrodes Y is divided into a first group and a second group, and scan signals are sequentially supplied to scan electrodes belonging to the first group, and then scan electrodes belonging to the second group Scan signals may be supplied sequentially.

According to an embodiment of the present invention, the plurality of scan electrodes Y may be divided into a first group located at an even number and a second group located at an odd number according to a position formed on a panel. In another embodiment, the panel may be divided into a first group positioned above and a second group positioned below the center of the panel.

The scan electrodes belonging to the first group divided by the above method are further divided into a first subgroup located at an even number and a second subgroup located at an odd number, or the first group. The first subgroup positioned above and the second group positioned below may be divided based on the center of the.

In the sustain period, a sustain pulse having a sustain voltage Vs is alternately applied to the scan electrode and the sustain electrode to generate sustain discharge in the form of surface discharge between the scan electrode and the sustain electrode.

The width of the first sustain signal or the last sustain signal among the plurality of sustain signals alternately supplied to the scan electrode and the sustain electrode in the sustain period may be greater than the width of the remaining sustain pulses.

The present invention is not limited by the waveforms shown in FIG. 4. For example, the pre-reset period may be omitted, and the polarity and voltage level of the driving signals shown in FIG. 4 may be changed as necessary. In addition, the single sustain driving may be performed by applying the sustain signal to only one of the scan electrode (Y) and the sustain (Z) electrode to generate a sustain discharge.

5 is a block diagram schematically illustrating a plasma display device according to an embodiment of the present invention, and FIG. 6 is a simplified internal block diagram of the controller of FIG. 5.

5 to 6, the plasma display apparatus 500 of the present invention includes a plasma display panel 510, an X driver 520, a Y driver 530, a Z driver 540, and a temperature detector ( 550 and the controller 560.

First, the plasma display panel 510 includes a plurality of scan electrodes and sustain electrodes formed on the upper substrate, and a plurality of address electrodes formed on the lower substrate. Detailed description of the plasma display panel 510 will be omitted with reference to FIGS. 1 and 2.

Next, the X driver 520 is connected to the address electrode lines X1 to Xn, the Y driver 530 is connected to the scan electrode lines Y1 to Ym, and the Z driver 540 is connected to the sustain electrode lines Z1 to Zm. Supply the drive signal of. For example, the X driver 520, the Y driver 530, and the Z driver 540 may supply driving signals as shown in FIG. 4 to the electrode lines.

Next, the temperature detector 550 detects the temperature of the plasma display panel 510 or its surroundings. For example, when the X driver 520, the Y driver 530, and the Z driver 540 are implemented in the form of an IPM (Intellectual Power Module), the temperature detector 550 may detect the temperature of the IPM. In addition, when a heat sink is attached to the IPM to dissipate heat, the temperature detector 550 may detect the temperature around the plasma display panel 510 in various ways such as to detect the temperature of the heat sink. It is possible.

Next, the controller 560 processes the input image signal and outputs driving control signals to the driving units 520, 530, and 540, respectively.

Referring to FIG. 6, the controller 560 may include an APL calculator 610, a subfield controller 620, and a sustain pulse controller 630.

The APL calculator 610 calculates an average image level (APL) per unit frame of the input image signal. When the data of the input image signal is assumed to be 8 bits, the image signal may be divided into 256 steps from 0 to 255 according to the luminance value. The output of the APL calculator 610 may be a value of 0 to 255 as an average image level, or may be a value obtained by converting the value of 0 to 255 to 0 to 100%.

The subfield controller 620 omits at least one of the plurality of subfields in the unit frame based on the detected temperature and the calculated average brightness level per unit frame.

For example, when the detected temperature is equal to or greater than the first temperature and the calculated average luminance level is equal to or less than the reference value, the subfield controller 620 may omit the last subfield among the plurality of subfields in the unit frame. Here, the first temperature is 40 ° C, the reference value may be 70%. Detailed operations of the subfield controller 620 will be described later with reference to FIG. 7.

The sustain pulse controller 630 may vary the number of sustain pulses based on the detected temperature and the calculated average brightness level per unit frame. Detailed operations of the sustain pulse controller 630 will be described later with reference to FIG. 7.

In addition, although not shown in the drawing, the controller 560 may include a scaling unit (not shown) that scales the input video signal to the resolution of the plasma display panel, and inversely gamma corrects the input video signal to correct the video signal. An inverse gamma correction unit (not shown) for linearly changing a luminance value different from the gray scale value, a gain control unit (not shown) for amplifying the inverse gamma corrected video data by an effective gain, and data from the gain control unit (not shown) An error diffuser (not shown) for finely adjusting the luminance value by diffusing an error component into adjacent cells, and a subfield mapping unit for mapping data input from the error diffuser (not shown) for each pre-stored subfield ( And a data arranging unit (not shown) for arranging the input video data from the subfield mapping unit (not shown) and supplying the video data to the X driver 510. Can.

FIG. 7 is a diagram for describing operations of the subfield controller and the sustain pulse controller of FIG. 6.

First, in order to describe the operations of the subfield controller 620 and the sustain pulse controller 630 of FIG. 7, it is assumed that the average luminance level is equal to or less than a reference value.

The subfield controller 620 may omit the last subfield of the plurality of subfields in the unit frame when the detected temperature is greater than or equal to the first temperature. FIG. 7B discloses reducing the number of subfields from 10 to 9 in 10 or more sections of the plurality of temperature sections. Section 10 of FIG. 7B may correspond to a case where the above-described first temperature is higher.

The sustain pulse controller 630 may vary the number of sustain pulses supplied to at least one of the scan electrode Y and the sustain electrode Z according to the detected temperature. FIG. 7A shows that when the detected temperature is within the normal range, the number of sustain pulses supplied to the R, G, and B discharge cells per frame is 1024, and the detected temperature is high (above the first temperature). , The number of sustain pulses supplied to the R, G, B discharge cells per frame can be set to 700.

On the other hand, the sustain pulse control unit 630 may vary the number of sustain pulses by dividing the detected temperature section into a plurality as shown in FIG. 7 (b). For example, the number of sustain pulses may be reduced in the high temperature section. In addition, it is also possible to omit at least one subfield among the plurality of subfields. Subfield omission may be performed by the subfield controller 620.

Although not shown in FIGS. 7A and 7B, the sustain pulse controller 630 has a high average image level APL per unit frame calculated by the APL calculator 610 as well as the detected temperature. The number of sustain pulses allocated as a result can be reduced.

8 and 9 illustrate driving signals and reset discharges according to an exemplary embodiment of the present invention.

First, in FIG. 8, when n frames are composed of 10 subfields, K sustain pulses are allocated to the ninth subfield 9SF in the sustain period, and L sustain pulses are assigned to the 10th subfield 10SF. Is assigned.

When the calculated average luminance level is lower than or equal to the reference value, the data pulse of the address section is not supplied so that sustain discharge is not performed in the sustain section of the tenth subfield 10SF, which is the last subfield of the n frame. That is, no address discharge is performed, so that despite the supply of the sustain pulse, the sustain discharge is also not performed.

Here, the reference value of the average brightness level may be set to 70%. When the average luminance level per unit frame is 70%, gray levels are not allocated to the last subfield of the unit frame. That is, even if the sustain pulses are set to L, addressing is not performed and gray scale expression is not performed.

However, in this case, when the detection temperature of the panel is high (above the first temperature), due to unstable priming due to the high temperature, the reset discharge in the reset period of the next frame (n + 1 frame) is unstable. As a result, high temperature misfiring occurs.

For example, the first temperature may be set to 40 ° C. When the temperature of the panel is 40 ° C. or higher, the possibility of unstable reset discharge of the next frame is increased due to unstable priming in the discharge cell.

In the drawing, the setup discharge 810 of the next frame (n + 1 frame) is smoothly performed, but the erase discharge is not smoothly performed.

In order to prevent this, according to an embodiment of the present invention, when the detection temperature of the plasma display panel is a high temperature (above the first temperature) and the calculated average luminance level is below the reference value, at least one of the plurality of subfields in the unit frame One subfield, especially the last subfield, is omitted.

FIG. 9 shows that the last subfield is omitted when the detection temperature of the plasma display panel is high (above the first temperature) and the calculated average luminance level is lower than or equal to the reference value. Hereinafter, the differences will be mainly described in comparison with FIG. 8.

For example, in the n frame of FIG. 9, J sustain pulses are allocated to the ninth subfield 9SF in the sustain period, and the tenth subfield 10SF may be omitted.

Although the address discharge and the sustain discharge are not performed as in the 10th subfield 10SF of FIG. 8, this is caused by the unstable priming due to the high temperature by supplying a sustain pulse or the like. This is to prevent the reset discharge from becoming unstable in the reset period of +1 frame).

As a result, by omitting the last subfield of the n frame, the reset discharge of the n + 1 framer can be performed stably. In the figure, the setup discharge 910 and the erase discharge 920 are performed smoothly. In addition, due to the omission of the last subfield, a timing margin can be secured for a shortened time.

On the other hand, when the detection temperature of the plasma display panel is high temperature (above the first temperature) and the calculated average luminance level is lower than or equal to the reference value, it is also possible to reduce the number of sustain pulses in addition to subfield omission. That is, it is possible to reduce the number of sustain pulses at which actual sustain discharge is performed.

Assuming that the sustain period in which the actual sustain discharge is performed is the ninth subfield 9SF, the sustain in the ninth subfield 9SF of FIG. 9 is more than the number of sustains (K) in the ninth subfield 9SF of FIG. The number J may be smaller.

Meanwhile, the above-described first temperature is 40 ° C., and the reference value may be 70%, but is not limited thereto and may be variously set.

10 is a flowchart schematically illustrating a method of driving a plasma display device according to an embodiment of the present invention.

Referring to the drawings, first, the temperature detection of the plasma display panel and the average luminance level per unit frame of the input image signal are calculated (S1010).

The temperature detection may be performed by the temperature detector 550 as shown in FIG. 5, and may detect the temperature of the plasma display panel or the surroundings thereof. For example, the temperature of the IPM or the temperature of the heat sink can be detected.

The average luminance level may be calculated by the APL calculator 610 as shown in FIG. 6.

Next, at least one subfield of the plurality of subfields in the unit frame is omitted according to the detected temperature and the average luminance level (S1020).

For example, when the detected temperature is a high temperature, that is, the first temperature or more and the average luminance level is less than or equal to the reference value, the last subfield of the plurality of subfields may be omitted. Here, the first temperature is 40 ° C, the reference value may be 70%.

This makes it possible to prevent unstable priming due to high temperature from affecting the next reset interval of. On the other hand, according to the omission of the last subfield, a timing margin can be secured for a shortened time.

Although not shown in the drawings, the method may further include varying the number of sustain pulses supplied to at least one of the scan electrode and the sustain electrode according to the detected temperature and the average brightness level.

In addition, the detected temperature may be divided into a plurality of temperature sections, and the number of sustain pulses allocated to each temperature section may be further reduced as the temperature increases.

For example, as the detected temperature and the average brightness are higher, the number of sustain pulses can be reduced. In addition, it is possible to divide the detected temperature into a plurality of temperature sections, and to reduce the number of sustain pulses allocated to each temperature section as the detected temperature is higher.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made to the branches. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

1 is a perspective view illustrating an embodiment of a structure of a plasma display panel.

2 is a cross-sectional view illustrating an embodiment of an electrode arrangement of a plasma display panel.

FIG. 3 is a timing diagram illustrating an embodiment of a method of time-divisionally driving a plasma display panel by dividing one frame into a plurality of subfields.

4 is a timing diagram illustrating an embodiment of driving signals for driving a plasma display panel.

5 is a block diagram schematically illustrating a plasma display device according to an embodiment of the present invention.

6 is a simplified internal block diagram of the controller of FIG. 5.

FIG. 7 is a diagram for describing operations of the subfield controller and the sustain pulse controller of FIG. 6.

8 and 9 illustrate driving signals and reset discharges according to an exemplary embodiment of the present invention.

10 is a flowchart schematically illustrating a method of driving a plasma display device according to an embodiment of the present invention.

Claims (12)

A plasma display panel including a plurality of scan electrodes and sustain electrodes formed on an upper substrate, and a plurality of address electrodes formed on a lower substrate; A driving unit supplying a driving signal to the plurality of electrodes; A temperature detector detecting a temperature of the panel; An APL calculator configured to calculate an average luminance level per unit frame of an input image signal; And And a subfield controller configured to omit at least one subfield among a plurality of subfields in the unit frame based on the detected temperature and the average brightness level. The method of claim 1, The subfield controller, And if the detected temperature is equal to or greater than the first temperature and the calculated average luminance level is equal to or less than a reference value, the last subfield of the plurality of subfields in the unit frame is omitted. The method of claim 2, The first temperature is 40 ℃, the reference value is a plasma display device, characterized in that 70%. The method of claim 1, And a sustain pulse controller configured to vary the number of sustain pulses supplied to at least one of the scan electrode and the sustain electrode based on the detected temperature and the average brightness level. The method of claim 4, wherein The sustain pulse control unit, And the number of the sustain pulses is reduced as the detected temperature and the average luminance level are higher. The method of claim 4, wherein The subfield controller, And dividing the detected temperature into a plurality of temperature sections and reducing the number of sustain pulses allocated to each temperature section as the detected temperature increases. Detects the temperature of the plasma display panel including a plurality of scan electrodes and sustain electrodes formed on the upper substrate and a plurality of address electrodes formed on the lower substrate, and calculates an average luminance level per unit frame of the input image signal. Doing; And Omitting at least one subfield from among a plurality of subfields in the unit frame according to the detected temperature and the calculated average luminance level. The method of claim 7, wherein The omission step, And when the detected temperature is equal to or greater than the first temperature and the calculated average luminance level is equal to or less than a reference value, the last subfield of the plurality of subfields in the unit frame is omitted. The method of claim 8, Wherein the first temperature is 40 ° C., and the reference value is 70%. The method of claim 7, wherein And varying the number of sustain pulses supplied to at least one of the scan electrode and the sustain electrode based on the detected temperature and the average brightness level. The method of claim 10, The variable step, And the number of the sustain pulses is reduced as the detected temperature and the average luminance level are higher. The method of claim 10, The variable step, And dividing the detected temperature into a plurality of temperature sections and reducing the number of sustain pulses allocated to each temperature section as the detected temperature is higher.

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