KR100705810B1 - Plasma Display Apparatus - Google Patents

Abstract

The present invention relates to a plasma display device, and more particularly, to stabilize the entire driving process by stabilizing address discharge, particularly during driving of a plasma display panel having a high volume content ratio of xenon, while reducing power consumption and driving efficiency. A plasma display device for improving.

The plasma display device according to the present invention variably adjusts the magnitude of the scan reference voltage applied to the scan electrode during the address period according to the plasma display panel including xenon gas, the temperature detector for detecting the temperature of the plasma display panel, and the temperature. It characterized in that it comprises a first scan driver for supplying.

Description

Plasma Display Apparatus

1 is a perspective view showing the structure of a typical plasma display panel.

2 is a diagram illustrating a method of implementing image gradation of a conventional plasma display panel.

3 is a view showing a driving waveform of a conventional plasma display device.

4 illustrates a plasma display device according to a first embodiment of the present invention.

5 is a view illustrating a driving waveform of the plasma display device according to the first embodiment of the present invention.

6 illustrates a plasma display device according to a second embodiment of the present invention.

7 illustrates a driving waveform of the plasma display device according to the second embodiment of the present invention.

8 is a diagram illustrating a plasma display device according to a third embodiment of the present invention.

9 illustrates driving waveforms of a plasma display device according to a third exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to stabilize the entire driving process by stabilizing address discharge, particularly during driving of a plasma display panel having a high volume content ratio of xenon, while reducing power consumption and driving efficiency. A plasma display device for improving.

In general, a plasma display panel forms a unit cell with a space between partition walls formed between a front substrate and a rear substrate, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne +). A main discharge gas such as He) and an inert gas containing a small amount of xenon (Xe) are filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 is a perspective view showing the structure of a typical plasma display panel.

As shown in FIG. 1, the plasma display panel is coupled in parallel with a front substrate 100, which is a display surface on which an image is displayed, and a rear substrate 110, which forms a rear surface, with a predetermined distance therebetween.

The front substrate 100 is based on the front glass 101, and scan electrodes 102 (Y electrodes) and sustain electrodes 103 (Z electrodes), that is, mutually discharged in one discharge cell and maintain light emission of the cells. The scan electrode 102 and the sustain electrode 103 formed of a transparent electrode a made of a transparent ITO material and a bus electrode b made of a metal material are formed in pairs. Scan electrode 102 and sustain electrode 103 are covered by one or more dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and on top of dielectric layer 104 to facilitate discharge conditions. A protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear substrate 110 is arranged with the stripe-type (or well-type) partition walls 112 to form a plurality of discharge spaces, that is, discharge cells, based on the rear glass 111. In addition, a plurality of address electrodes 113 (X electrodes) for performing address discharge to generate vacuum ultraviolet rays are disposed in parallel with the partition wall 112. The upper surface of the rear substrate 110 is coated with R, G, B phosphors 114 that emit visible light for image display during address discharge. A white dielectric 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113 and reflect the visible light emitted from the phosphor 114 to the front substrate 100.

A method of implementing gray levels of an image in such a plasma display panel will now be described with reference to FIG. 2.

2 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display panel.

As shown in FIG. 2, in the conventional method of expressing a gray level of a plasma display panel, a frame is divided into several subfields having a different number of emission times, and each subfield has a reset period (RPD) for initializing all cells. ) Is divided into an address period APD for selecting a cell to be discharged and a sustain period SPD for implementing gradation according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 through SF8, and eight subfields SF1 through. SF8) are each divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the cell to be discharged is caused by the voltage difference between the address electrode and the transparent electrode which is the scan electrode. The sustain period is increased at the rate of 2 ⁿ (n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. As described above, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges. Referring to the driving waveform of the plasma display panel as shown in FIG.

3 illustrates a driving waveform of a conventional plasma display panel.

As shown in FIG. 3, the conventional plasma display panel is driven by being divided into a reset period for initializing all cells, an address period for selecting a cell to be discharged, and a sustain period for maintaining discharge of the selected cell.

In the reset period, the rising ramp waveform is simultaneously applied to all the scan electrodes in the setup period. This rising ramp waveform causes a weak dark discharge within the full discharge cells. By this setup discharge, positive wall charges are accumulated on the address electrode and the sustain electrode, and negative wall charges are accumulated on the scan electrode.

In the set down period, after the rising ramp waveform is supplied, the falling ramp waveform begins to fall from the positive voltage lower than the peak voltage of the rising ramp waveform and falls to a specific voltage level below the ground (GND) level. By causing the discharge, the wall charges excessively formed on the scan electrodes are sufficiently erased.

By this set-down discharge, wall charges such that the address discharge can stably occur remain uniformly in the cells.

In the address period, a negative scan signal is sequentially applied to the scan electrodes, and a positive data signal is applied to the address electrodes in synchronization with the scan signal. As the voltage difference between the scan signal and the data signal and the wall voltage generated in the reset period are added, address discharge is generated in the discharge cell to which the data signal is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The sustain electrode is supplied with a positive voltage Vzb to reduce the voltage difference between the scan electrode and to prevent mis-discharge with the scan electrode during the set-down period and the address period.

In the sustain period, a sustain signal Su is alternately applied to the scan electrode and the sustain electrodes. In the cell selected by the address discharge, as the wall voltage and the sustain signal in the cell are added, a sustain discharge, that is, a display discharge occurs between the scan electrode and the sustain electrode every time the sustain signal is applied.

In this way, the driving process of the plasma display panel in one subfield is completed.

However, in consideration of the sophisticated discharge mechanism of the plasma display panel, the driving process of the plasma display panel in one subfield includes various problems. In particular, the address discharge between the scan electrode and the address electrode may be excessive or insufficient during the address period. In this case, there is also a problem that the driving process of the plasma display panel is lowered as a result, which affects subsequent discharge processes.

In particular, the effects of the mixing ratio of the temperature of the panel and the inert gases injected into the discharge space on the address discharge will be described.

It is common to inject xenon (Xe) gas together with neon (Ne), helium (He) or a mixture of neon and helium (Ne + He) in the discharge space in order to increase the luminous efficiency in driving the plasma display panel. to be.

However, when the mixing ratio of xenon (Xe) gas is increased, the luminous efficiency is increased but the discharge start voltage is increased, thereby increasing the power consumption.

In addition, heat generated due to various factors in the discharge space or the driving apparatus when driving the plasma display panel having a high mixing ratio of xenon (Xe) gas affects the charge distribution in the discharge space. In particular, at high temperatures, since the movement of the space charge in the discharge space becomes active, recombination occurs easily, resulting in loss of wall charges, thereby causing mis-discharge.

Therefore, a means for stabilizing the entire driving process by stabilizing the address discharge is particularly required during the driving process of the plasma display panel having a high mixing ratio of xenon (Xe) gas.

In order to solve this problem, the present invention stabilizes the entire driving process by stabilizing address discharge, particularly during the driving process of the plasma display panel having a high volume content ratio of xenon, while reducing power consumption and improving driving efficiency. The purpose is to provide.

In accordance with another aspect of the present invention, a plasma display device includes a plasma display panel including xenon gas, a temperature detector for detecting a temperature of the plasma display panel, and a scan electrode for an address period according to the temperature. And a first scan driver configured to variably adjust and apply an applied scan reference voltage.

The volume content ratio of xenon gas is characterized in that 8% or more.

The scan reference voltage is characterized by being positive.

The magnitude of the scan reference voltage is proportional to the temperature.

The magnitude of the scan reference voltage is greater than the magnitude of the subfield reference voltage and less than the magnitude of the sustain pulse.

In addition, the plasma display device according to the second exemplary embodiment of the present invention includes a plasma display panel including xenon gas, a temperature detector for detecting a temperature of the plasma display panel, and a scan voltage from a positive scan reference voltage to a scan voltage during an address period. And a second scan driver configured to variably adjust the magnitude of the falling scan pulse.

The volume content ratio of xenon gas is characterized in that 8% or more.

The scan voltage is characterized by being negative.

The magnitude of the scan voltage is proportional to the temperature.

The magnitude of the scan voltage is more than 1/2 times and less than 2/3 times of the sustain pulse size.

In addition, the plasma display device according to the third embodiment of the present invention includes a plasma display panel including xenon gas, a temperature detector for detecting the temperature of the plasma display panel, and a scan reference voltage applied to the scan electrode during the address period. And a third scan driver configured to variably adjust and supply a magnitude of a scan pulse falling from the scan reference voltage to the scan voltage.

The volume content ratio of xenon gas is characterized in that 8% or more.

The scan reference voltage is positive and the scan voltage is negative.

The scan reference voltage and the magnitude of the scan voltage are proportional to the temperature.

The magnitude of the scan reference voltage is greater than or equal to the magnitude of the subfield reference voltage and less than or equal to the magnitude of the sustain pulse, and the magnitude of the scan voltage is 1/2 or more times or less than 2/3 times the magnitude of the sustain pulse.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments of the plasma display device according to the present invention.

4 is a diagram illustrating a plasma display device according to a first embodiment of the present invention.

As shown in FIG. 4, the plasma display device according to the first embodiment of the present invention has address electrodes X1 to Xm, scan electrodes Y1 to Yn, and sustain in a reset period, an address period, a sustain period, and an erase period. Plasma display panel 400 for expressing an image by generating a gas discharge in a discharge space containing xenon gas by applying a predetermined driving pulse to electrode Z, and a temperature detector for detecting the temperature of plasma display panel 400. 46, the data driver 42 for supplying data to the address electrodes X1 to Xm formed on the rear panel (not shown), and the scan electrodes Y1 to Yn to select the scan line during the address period. A driving device for driving the scan electrodes Y1 to Yn by applying voltages including the scan reference voltage Vsc1 whose size is adjusted according to the scan pulse and the temperature detected by the temperature detector 46. One scan driver 43, a sustain driver 44 for driving the sustain electrode Z as a common electrode, a timing controller 41 for controlling the drivers 42, 43, 44, and each driver 42, And a driving voltage generator 45 for supplying a driving voltage to the 43 and 44.

Hereinafter, functions and operations of the components of the plasma display device according to the first embodiment of the present invention will be described in detail.

First, although not shown, the plasma display panel 400 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals with a discharge space including xenon gas interposed therebetween. For example, the scan electrodes Y1 to Yn and the sustain electrode Z are formed in pairs, and on the rear panel, the address electrodes X1 to Y cross the scan electrodes Y1 to Yn and the sustain electrode Z. Xm) is formed.

The temperature detector 46 detects the temperature of the plasma display panel 400.

The data driver 42 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like not shown, and then data mapped to a subfield pattern preset by the subfield mapping circuit is supplied. The data driver 42 samples and latches data under the control of the timing controller 41, and then supplies the data to the address electrodes X1 to Xm.

The first scan driver 43 is at least one of a rising pulse or a gradually falling pulse that gradually rises to the scan electrodes Y1 to Yn to initialize the whole screen during the reset period under the control of the timing controller 41. Apply a reset waveform comprising one.

In addition, the first scan driver 43 may scan pulses and the temperature detector 46 at the scan electrodes Y1 to Yn to select a scan line during the address period after the reset waveform is supplied to the scan electrodes Y1 to Yn. The scan reference voltage Vsc1 whose size is adjusted according to the detected temperature is applied.

In addition, the first scan driver 43 supplies a sustain pulse to the scan electrodes Y1 to Yn to allow sustain discharge to occur in the selected cell in the address period during the sustain period.

The sustain driver 44 supplies the first bias voltage Vzb1 with the positive polarity to the sustain electrode Z during the at least part of the reset period and the second bias voltage Vzb2 during the address period under the control of the timing controller 41. Thereafter, the first pulse driver 43 alternately operates with the first scan driver 43 to supply a sustain pulse to the sustain electrode Z.

The timing controller 41 receives the vertical / horizontal synchronization signal and generates timing control signals CTRX, CTRY, and CTRZ required for each driving unit, and transmits the timing control signals CTRX, CTRY, and CTRZ to the corresponding driving units 42, 43, Each of the driving units 42, 43, and 44 is controlled by supplying to 44. The timing control signal CTRX applied to the data driver 42 includes a sampling clock for sampling data, a latch control signal, an energy recovery circuit, and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRY applied to the first scan driver 43 includes a switch control signal for controlling the on / off time of the energy recovery circuit and the driving switch element in the first scan driver 43. The timing control signal CTRZ applied to the sustain driver 44 includes a switch control signal for controlling the on / off time of the energy recovery circuit and the drive switch element in the sustain driver 44.

The driving voltage generator 45 includes the subfield reference voltage Vref, the sustain voltage Vs, the first bias voltage Vzb1, the second bias voltage Vzb2, the data voltage Va, and the scan voltage Vy. Various driving voltages required by each of the driving units 42, 43, and 44 including the scan reference voltage Vsc1 are generated. These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

Hereinafter, the operation principle of the plasma display device according to the first embodiment of the present invention will be described in detail with reference to FIG. 5.

As shown in FIG. 5, in the plasma display device according to the first exemplary embodiment, a reset period RP for initializing all cells, an address period AP for selecting a cell to be discharged, and a discharge of a selected cell are shown. The driving period is divided into a sustain period SP for maintaining the erase period and an erase period EP for erasing the unnecessary charges.

A characteristic feature of the present invention lies in the voltage applied to the scan electrodes Y1 to Yn during the address period AP, and the temperature of the plasma display panel at the scan electrodes Y1 to Yn during the address period AP. It is characterized in that it supplies the scan reference voltage Vsc1 whose size is adjusted accordingly.

Hereinafter, the voltage applied to each period and its function will be described in detail.

First, in the reset period RP, the rising ramp waveform PR is simultaneously applied to all the scan electrodes Y1 to Yn in the setup period SU. Due to the rising ramp waveform PR, a weak dark discharge occurs in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrodes X1 to Xm and the sustain electrode Z, and negative wall charges are accumulated on the scan electrodes Y1 to Yn.

Subsequently, in the set down period SD to which the falling ramp voltage NR is applied, the positive wall charges of the address electrodes X1 to Xm are kept as they are, and are discharged between the sustain electrodes Z and the scan electrodes Y1 to Yn. The positive wall charges of the sustain electrode Z are erased, and the sustain electrode Z and the scan electrodes Y1 to Yn divide a large amount of negative charges accumulated on the scan electrodes Y1 to Yn.

By this set down discharge, the wall charges such that the address discharge can stably occur remain uniformly in the cells.

In addition, in order to reduce wall charges to an appropriate level, the first bias voltage Vzb1 having a positive polarity is applied to the sustain electrode Z during the set down period SD. The scan electrodes Y1 to Yn to which the falling ramp voltage NR is applied have a relatively low voltage level with respect to the sustain electrode Z to which the positive first bias voltage Vzb1 is applied. As the polarity is reversed compared to SU), wall charges accumulated in the setup period SU are erased to an appropriate level.

Next, in the address period AP, the positive data pulse voltage Va is applied to the address electrodes X1 to Xm, and the scan pulse SCNP falling from the scan reference voltage Vsc1 to the scan electrodes Y1 to Yn is synchronized. When applied, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the address electrodes X1 to Xm and the scan electrodes Y1 to Yn due to wall charges formed during the reset period RP are applied. As the wall voltage between them is added, address discharge occurs.

In this case, the address discharge may be smoothly generated by adjusting the size of the scan reference voltage Vsc1 applied to the scan electrodes Y1 to Yn according to the temperature of the plasma display panel.

The volume content ratio of xenon gas on the discharge space is preferably 8% or more. As such, by setting the volume content ratio of the xenon gas to 8% or more, it is possible to provide a plasma display device having improved luminous efficiency.

It is preferable that the scan reference voltage Vsc1 be positive. By adjusting the scan reference voltage Vsc1 to the positive polarity, the address discharge of the plasma display panel containing 8% or more of xenon gas is stabilized.

The size of the scan reference voltage Vsc1 may be adjusted to be proportional to the temperature of the plasma display panel. As such, adjusting the size of the scan reference voltage Vsc1 to be proportional to the temperature of the plasma display panel takes into account the wall charge loss caused by the temperature rise of the plasma display panel.

The scan reference voltage Vsc1 has a magnitude greater than or equal to the subfield reference voltage Vref and preferably supplied below the magnitude Vs of the sustain pulse SUSP. As such, adjusting the magnitude of the scan reference voltage Vsc1 to be greater than the magnitude of the subfield reference voltage Vref and less than or equal to the magnitude Vs of the sustain pulse SSUS smoothly generates the address discharge, while causing excessive address discharge. This is to improve the driving efficiency of the plasma display device by preventing the degradation of the contrast ratio characteristic and the mis-discharge.

On the other hand, in the sustain electrode Z, the voltage difference between the scan electrodes Y1 to Yn is reduced during the set down period SD and the address period AP so as to prevent erroneous discharge from the scan electrodes Y1 to Yn so as to prevent the discharge of the positive electrode. The bias voltage Vzb2 is supplied.

Next, in the sustain period SP, a sustain pulse SUSP that rises from the subfield reference voltage Vref to the sustain voltage Vs is applied to the scan electrodes Y1 to Yn and the sustain electrodes Z alternately. . The cell selected by the address discharge has a sustain discharge, i.e., between the scan electrodes Y1 to Yn and the sustain electrode Z every time the sustain pulse SSUS is applied as the wall voltage and the sustain pulse SSUS in the cell are added. Display discharge occurs.

Finally, in the erasing period, in consideration of the fact that the last sustain pulse SSUS is applied to the scan electrodes Y1 to Yn in the sustain period SP, the rising pulse type erasing pulse ER is applied to the sustain electrode Z. Eliminate unnecessary charges.

In this way, the driving process of the plasma display device according to the first embodiment of the present invention in one subfield is completed.

As described in detail above, the plasma display device according to the first embodiment of the present invention regulates the level of the scan reference voltage applied to the scan electrode during the address period according to the temperature of the plasma display panel to stabilize the address discharge. While stabilizing the process, a plasma display device for reducing power consumption and improving driving efficiency is provided.

6 is a diagram illustrating a plasma display device according to a second embodiment of the present invention.

As shown in FIG. 6, the plasma display device according to the second exemplary embodiment of the present invention has address electrodes X1 to Xm, scan electrodes Y1 to Yn, and sustain in a reset period, an address period, a sustain period, and an erase period. A temperature for detecting the temperature of the plasma display panel 600 and the plasma display panel 600 which express an image by generating a gas discharge in a discharge space containing xenon gas by applying a predetermined driving pulse to the electrode Z. A data driver 62 for supplying data to the detector 66, address electrodes X1 to Xm formed on the rear panel (not shown) of the plasma display panel 600, and to select a scan line during the address period. The scan electrodes Y1 to Yn are applied to the scan electrodes Y1 to Yn by applying voltages including scan pulses whose magnitude is adjusted according to the temperature detected by the temperature detector 66. A second scan driver 63 for driving, a sustain driver 64 for driving the sustain electrode Z serving as a common electrode, a timing controller 61 for controlling the drivers 62, 63, and 64, and each driver And a driving voltage generator 65 for supplying driving voltages to the 62, 63, and 64.

The plasma display device according to the second embodiment of the present invention has the same operation principle as the components except for the second scan driver 63 compared to the plasma display device according to the first embodiment of the present invention. The description will focus on the operation principle of the second scan driver 63 and the description of the remaining components will be replaced with the description of the first embodiment of the present invention.

The second scan driver 63 includes at least one of rising pulses gradually rising or falling pulses gradually falling on the scan electrodes Y1 to Yn to initialize the entire screen during the reset period under the control of the timing controller 61. Apply a reset waveform comprising one.

Also, the second scan driver 63 detects the temperature detected by the temperature detector 66 at the scan electrodes Y1 to Yn to select the scan line during the address period after the reset waveform is supplied to the scan electrodes Y1 to Yn. Apply a scan pulse scaled according to temperature.

In addition, the second scan driver 63 supplies a sustain pulse to the scan electrodes Y1 to Yn to enable sustain discharge to occur in the selected cell in the address period during the sustain period.

Hereinafter, the operation principle of the plasma display device according to the second embodiment of the present invention will be described in detail with reference to FIG. 7.

As shown in FIG. 7, the plasma display device according to the second embodiment of the present invention has a reset period RP for initializing all cells, an address period AP for selecting a cell to be discharged, and discharge of a selected cell. The driving period is divided into a sustain period SP for maintaining the erase period and an erase period EP for erasing the unnecessary charges.

The operation of the plasma display device according to the second embodiment of the present invention except for the address period AP is the same as that of the plasma display device according to the first embodiment of the present invention. The description focuses on the operation principle of the AP and the description of the remaining components is replaced with the description of the first embodiment of the present invention.

During the address period AP, the scan pulses falling from the scan data voltage Vsc to the scan voltage (-Vy2) from the scan data voltage Va to the positive electrodes and the scan electrodes Y1 to Yn are positive. When the SCNP is synchronously applied, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the address electrodes X1 to Xm and the scan electrodes due to wall charges formed during the reset period RP The address discharge occurs as the wall voltage between Y1 and Yn) is added.

At this time, by adjusting the size of the scan voltage (-Vy2) applied to the scan electrodes (Y1 to Yn) (Vy2) according to the temperature of the plasma display panel, the size of the scan pulse (SCNP) as a result, the address discharge smoothly Can be generated.

The volume content ratio of the xenon gas on the discharge space is preferably 8% or more. As such, by setting the volume content ratio of the xenon gas to 8% or more, it is possible to provide a plasma display device having improved luminous efficiency.

The scan voltage (-Vy2) is preferably made negative. Thus, by adjusting the scan voltage (-Vy2) to be negative, the address discharge of the plasma display panel containing 8% or more of xenon gas is stabilized.

The size Vy2 of the scan voltage -Vy2 is preferably adjusted to be proportional to the temperature of the plasma display panel. As described above, adjusting the magnitude Vy2 of the scan voltage -Vy2 to be proportional to the temperature of the plasma display panel takes into account the wall charge loss caused by the temperature rise of the plasma display panel.

It is preferable that the magnitude Vy2 of the scan voltage -Vy2 is adjusted to 1/2 or more times and 2/3 times or less of the sustain pulse SUSP magnitude Vs and supplied.

 Thus, adjusting the magnitude Vy2 of the scan voltage (-Vy2) to 1/2 or more times and 2/3 times or less of the sustain pulse (SUSP) size Vs smoothly generates an address discharge, while excessive address discharge This is to improve the driving efficiency of the plasma display device by preventing the deterioration of the contrast ratio characteristic, the mis-discharge, and the like.

On the other hand, in the sustain electrode Z, the voltage difference between the scan electrodes Y1 to Yn is reduced during the set down period SD and the address period AP so as to prevent erroneous discharge from the scan electrodes Y1 to Yn so as to prevent the discharge of the positive electrode. The bias voltage Vzb2 is supplied.

In this way, the driving process of the plasma display device according to the second embodiment of the present invention in one subfield is completed.

As described in detail above, the plasma display device according to the second embodiment of the present invention adjusts the magnitude of the scan voltage applied to the scan electrode during the address period according to the temperature of the plasma display panel, and consequently, adjusts the magnitude of the scan pulse. By stabilizing the address discharge and thereby stabilizing the entire driving process, a plasma display device for reducing power consumption and improving driving efficiency is provided.

8 is a diagram illustrating a plasma display device according to a third embodiment of the present invention.

As shown in FIG. 8, the plasma display device according to the third exemplary embodiment of the present invention has address electrodes X1 to Xm, scan electrodes Y1 to Yn, and sustain in a reset period, an address period, a sustain period, and an erase period. Plasma display panel 800 for expressing an image by generating a gas discharge in a discharge space containing xenon gas by applying a predetermined driving pulse to electrode Z, and a temperature detector for detecting the temperature of plasma display panel 800 A data driver 82 supplying data to the address electrodes X1 to Xm formed on the rear panel (not shown) of the plasma display panel 800, and a scan to select a scan line during the address period. Scan by applying voltages including a scan reference voltage and a scan pulse whose magnitude is adjusted according to the temperature detected by the temperature detector 86 to the electrodes Y1 to Yn. A third scan driver 83 for driving the poles Y1 to Yn, a sustain driver 84 for driving the sustain electrode Z which is a common electrode, and a timing controller for controlling each of the drivers 82, 83, and 84; 81, and a drive voltage generator 85 for supplying a drive voltage to each of the drive units 82,83,84.

The plasma display device according to the third embodiment of the present invention has the same operation principle as the components except for the third scan driver 83 compared with the plasma display device according to the first embodiment of the present invention. The description will focus on the operation principle of the third scan driver 83 and the description of the remaining components will be replaced with the description of the first embodiment of the present invention.

The third scan driver 83 has at least one of rising pulses gradually rising or falling pulses gradually falling on the scan electrodes Y1 to Yn to initialize the entire screen during the reset period under the control of the timing controller 81. Apply a reset waveform comprising one.

Also, the third scan driver 83 detects the temperature detected by the temperature detector 86 at the scan electrodes Y1 to Yn to select the scan line during the address period after the reset waveform is supplied to the scan electrodes Y1 to Yn. Apply a scan pulse and scan reference voltage scaled by temperature.

In addition, the third scan driver 83 supplies a sustain pulse to the scan electrodes Y1 to Yn to allow sustain discharge to occur in the selected cell in the address period during the sustain period.

Hereinafter, the operation principle of the plasma display device according to the third embodiment of the present invention will be described in detail with reference to FIG. 9.

As shown in FIG. 9, in the plasma display device according to the third exemplary embodiment, a reset period RP for initializing all cells, an address period AP for selecting a cell to be discharged, and a discharge of a selected cell are shown. The driving period is divided into a sustain period SP for maintaining the erase period and an erase period EP for erasing the unnecessary charges.

The operation of the plasma display device according to the third embodiment of the present invention except for the address period AP is the same as that of the plasma display device according to the first embodiment of the present invention. The description focuses on the operation principle of the AP and the description of the remaining components is replaced with the description of the first embodiment of the present invention.

During the address period AP, the data pulse voltage Va of the positive polarity is applied to the address electrodes X1 to Xm, and the scan pulses falling from the scan reference voltage Vsc3 to the scan voltage -Vy3 are applied to the scan electrodes Y1 to Yn. When the SCNP is synchronously applied, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the address electrodes X1 to Xm and the scan electrodes due to wall charges formed during the reset period RP The address discharge occurs as the wall voltage between Y1 to Yn) is added.

At this time, the scan reference voltage Vsc3 and the magnitude Vy3 of the scan voltage (-Vy3) applied to the scan electrodes Y1 to Yn are adjusted according to the temperature of the plasma display panel, and as a result, the magnitude of the scan pulse SCNP is adjusted. By adjusting, address discharge can be generated smoothly.

The volume content ratio of the xenon gas on the discharge space is preferably 8% or more. As such, by setting the volume content ratio of the xenon gas to 8% or more, it is possible to provide a plasma display device having improved luminous efficiency.

Preferably, the scan reference voltage Vsc3 is made positive and the scan voltage -Vy3 is made negative. In this way, the scan reference voltage Vsc3 is made positive and the scan voltage (-Vy3) is made negative to stabilize the address discharge of the plasma display panel containing 8% or more of xenon gas.

It is preferable to adjust the magnitude Vsc3 of the scan reference voltage Vsc3 and the magnitude Vy3 of the scan voltage -Vy3 to be proportional to the temperature of the plasma display panel. As such, adjusting the magnitude Vsc3 of the scan reference voltage Vsc3 and the magnitude Vy3 of the scan voltage (-Vy3) in proportion to the temperature of the plasma display panel takes into account the wall charge loss caused by the temperature rise of the plasma display panel. will be.

The magnitude Vsc3 of the scan reference voltage Vsc3 is adjusted to be greater than or equal to the magnitude Vref of the subfield reference voltage and less than or equal to the magnitude Vs of the sustain pulse SSUS, and the magnitude Vy3 of the scan voltage Vy3 is It is preferable to adjust and supply to 1/2 times or more and 2/3 times or less of the sustain pulse SUSP magnitude Vs.

 In this manner, the magnitude Vsc3 of the scan reference voltage Vsc3 is adjusted to be equal to or greater than the magnitude Vref of the subfield reference voltage and equal to or less than the magnitude Vs of the sustain pulse SSUS, and the magnitude Vy3 of the scan voltage (-Vy3). ) Is more than 1/2 times the sustain pulse (SUSP) size (Vs) and less than 2/3 times adjusts the address discharge smoothly, while lowering the contrast ratio characteristics and mis-discharge that can be caused by excessive address discharge. The purpose of the present invention is to improve driving efficiency of the plasma display device.

On the other hand, in the sustain electrode Z, the voltage difference between the scan electrodes Y1 to Yn is reduced during the set down period SD and the address period AP so as to prevent erroneous discharge from the scan electrodes Y1 to Yn so as to prevent the discharge of the positive electrode. The bias voltage Vzb2 is supplied.

In this way, the driving process of the plasma display device according to the third exemplary embodiment of the present invention in one subfield is completed.

As described in detail above, the plasma display device according to the third embodiment of the present invention adjusts the magnitude of the scan reference voltage and the scan voltage applied to the scan electrode during the address period according to the temperature of the plasma display panel, and as a result, the scan pulse. The present invention provides a plasma display device which stabilizes the address discharge by controlling the size of the power source, stabilizes the entire driving process, reduces power consumption, and improves driving efficiency.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all aspects, and the scope of the present invention is indicated by the following claims rather than the foregoing detailed description, and the meanings of the claims and All changes or modifications derived from the scope and equivalent concepts thereof should be construed as being included in the scope of the present invention.

As described in detail above, the present invention adjusts the size of at least one of the scan reference voltage and the scan pulse applied to the scan electrode during the address period according to the panel temperature during the driving of the plasma display panel having a high volume content ratio of xenon. By stabilizing the address discharge to stabilize the entire driving process, while reducing the power consumption and improves the driving efficiency is provided.

Claims (15)

A plasma display panel comprising xenon gas; A temperature detector detecting a temperature of the plasma display panel; And a first scan driver configured to variably adjust and supply a scan reference voltage applied to the scan electrode according to the temperature. The method of claim 1, And a volume content ratio of the xenon gas is 8% or more. The method of claim 2, And the scan reference voltage is positive. The method according to any one of claims 1 to 3, The magnitude of the scan reference voltage is proportional to the temperature. The method of claim 4, wherein The magnitude of the scan reference voltage is greater than the magnitude of the subfield reference voltage and less than the magnitude of the sustain pulse. delete delete delete delete delete A plasma display panel comprising xenon gas; A temperature detector detecting a temperature of the plasma display panel; And a third scan driver configured to variably adjust and supply a scan reference voltage applied to the scan electrode during the address period and a scan pulse falling from the scan reference voltage to the scan voltage according to the temperature. Device. The method of claim 11, And a volume content ratio of the xenon gas is 8% or more. The method of claim 12, And the scan reference voltage is positive and the scan voltage is negative. The method according to any one of claims 11 to 13, And the magnitude of the scan reference voltage and the scan voltage is proportional to the temperature. The method of claim 14, The magnitude of the scan reference voltage is greater than the magnitude of the subfield reference voltage and less than the magnitude of the sustain pulse. And the scan voltage is 1/2 or more times and 2/3 or less times the sustain pulse size.

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