KR100791356B1 - Method and device for driving plasma display panel reflecting temperature of driving parts - Google Patents

Abstract

The present invention directly detects the temperature of a heat generating component that has a high degree of heat generation such as a sustain pulse supply FET, a data driver IC, and a scan IC included in the driving circuit, which has a high influence on the driving reliability of the AC PDP. It is to make it possible.

According to an aspect of the present invention, there is provided a method of driving a plasma display panel, the method comprising: sensing a temperature of at least one heating component included in a circuit module for driving the panel; And adjusting the driving waveform of the panel according to the sensed temperature of the heat generating component.

Plasma display panel, PDP, temperature, control, drive waveform, drive device, drive method

Description

TECHNICAL AND DEVICE FOR DRIVING PLASMA DISPLAY PANEL REFLECTING TEMPERATURE OF DRIVING PARTS}

1 schematically shows the configuration of an AC PDP apparatus SET having a PDP as a display element.

2 illustrates one method commonly used to drive an AC PDP panel.

3 is a waveform diagram illustrating a driving method during the one subfield, respectively.

4 is a schematic diagram illustrating board placement on a frame of an AC PDP set.

5 shows an embodiment of the PDP driving apparatus of the present invention.

6A to 6C are views for exemplarily describing various methods for generating a waveform adjustment signal in a control unit of the PDP driving apparatus of the present invention.

7 is a flowchart illustrating an embodiment of a PDP driving method of the present invention.

8 illustrates a change in driving waveform according to a video signal level increase and decrease.

9 illustrates changes in driving waveforms due to gray level increase and decrease.

The present invention relates to a driving method and a driving apparatus of a plasma display panel, and more particularly, by directly sensing the temperature of each driving component constituting the driving circuit of the plasma display panel and adjusting the driving waveform applied to the panel accordingly. SUMMARY OF THE INVENTION An object of the present invention is to provide a driving method and a driving apparatus for a plasma display panel which can improve the reliability of the driving circuit by improving the degree of freedom in brightness control and preventing local overheating.

In general, a plasma display panel (PDP) is one of the most widely used flat panel display devices, and displays an image by exciting and emitting phosphors by ultraviolet rays generated during gas discharge. Done.

Fig. 1 schematically shows the configuration of an AC PDP apparatus SET having the PDP 10 as a display element. The illustrated AC PDP device SET includes a PDP panel 10, a plurality of sustain electrodes Z ₁ , Z ₂ , ... Z _n , and a plurality of scan electrodes Y ₁ , which are formed in the PDP panel 10. Y ₂ , ... Y _n ) and sustain drive circuit 30, scan drive circuit 20 and data drive circuit 40 which respectively drive a plurality of address electrodes X ₁ , X ₂ , ... X _n . ). In addition, a control unit 50 is provided to control the respective driving circuits 20, 30, and 40 according to the received image data, and each of the driving circuits 20 and 30 is controlled by the control unit 50. 40 outputs the drive waveforms illustrated in FIG. 3 to each electrode for one sub-field.

2 illustrates one method commonly used to drive an AC PDP panel. In order to drive the AC PDP panel, as shown in FIG. 2, there are generally a plurality of subfields of different brightness (for example, eight) during one TV field representing a unit image, and each subfield It consists of a reset period (or an initialization period), an address period (or a writing period), and a sustain discharge period (or 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.

3 is a waveform diagram illustrating a driving method during the one subfield, respectively. First, the initialization period R serves to make the wall charge states of all cells the same so that subsequent address discharges can occur under the same initial conditions. In addition, in the address period W, in order to select cells to be turned on and cells to be turned off in correspondence with the image signal in the discharge sustain period 300 which follows, the scan electrodes Y perpendicular to each other in the respective cells and The discharge is generated between the address electrodes X to form a desired wall charge. In the subsequent discharge sustain period S, a discharge sustain voltage lower than the discharge start voltage is applied between the scan electrode Y and the sustain electrode Z so that sustain discharge is sustained only for the cells ON in the address period. In the address period, discharge between the scan electrode Y and the address electrode X has already occurred so that subsequent sustain discharge occurs only in the cell where the wall charge has been formed.

4 is a schematic diagram illustrating board placement on a frame 70 of an AC PDP set. As shown in the drawing, the frame 70 is installed on the rear surface of the PDP panel 10 to support the panel 10 and perform a heat sink function, as well as various PDP driving circuit boards 121, 122, 130, 140, 150 are mounted thereon. In particular, a scan buffer board 122 having a scan driving IC corresponding to each scan electrode, a Y driving board 121 having a scan electrode driving circuit except for the scan driving IC, and a Z driving board equipped with a sustain electrode driving device. (130), the data driver board 140 for driving the address electrode (X) and the control board 150 for controlling their operation, between each of the boards 121, 122, 130, 140, 150 and the panel ( Flexible Printed Circuits 61, 62, 63, 64, 65, 66 for electrical connection therewith are provided.

A lot of heat may be generated in each circuit component for driving the AC PDP panel 10, and it is difficult to expect smooth driving and reliability of the AC PDP panel 10 without proper cooling. In particular, in recent years, since the discharge cells tend to be highly detailed, the driving elements have to be more densely mounted, and thus the heat dissipation problem is further increased.

Therefore, in order to smoothly control the temperature when the AC PDP panel 10 is driven, the temperature sensor 60 for detecting the temperature state of the panel 10 and controlling the driving state accordingly is shown as shown in the control board 150. ) Can be installed. However, this method only detects the overall ambient temperature, and thus, there is a limit that the precision of the control is lowered because it is impossible to control according to the actual temperature of the panel 10 itself or the actual temperature of each circuit component.

Meanwhile, the present applicant has invented a 'plasma display driving device' in which a temperature sensor is installed on a heat sink (corresponding to the frame) disposed on the rear surface of the panel so as to accurately detect the temperature of the panel itself and enable more stable driving. , Has applied for a patent (Korean Patent Registration 10-0549666).

However, such a prior art temperature detection and AC PDP driving method and driving device using the same are merely used to sense and control the temperature of the AC PDP panel 10 or the ambient atmosphere temperature as a result of the driving, There is a limit that the temperatures can be independent of the temperature of the components constituting the actual driving circuit, according to the above-mentioned conventional techniques to accurately measure and reflect the temperature of each heating component to ensure the reliability of the driving IC, etc. Can not expect efficient optimal drive of.

The present invention has been made to solve the above problems, and the temperature of the heat generating component having a high degree of heat generation such as the sustain pulse supply FET, the data driver IC, and the scan IC included in the driving circuit has a high effect on the driving reliability of the AC PDP. This is to detect and reflect this to the operation of the AC PDP.

In addition, the present invention is to provide a PDP driving method and a driving device that can sense the temperature of the heat generating component included in the drive circuit, and thereby appropriately control the drive waveform to mitigate the cause of heat generation.

Furthermore, the present invention senses the temperature of the heating component included in the driving circuit, and thereby controls the temperature by increasing or decreasing the number of sustain pulses, increasing or decreasing the video signal level, or to increase the reliability of the AC PDP drive, The purpose is to enable more natural brightness.

In order to achieve the above object, a method of driving a plasma display panel according to a first aspect of the present invention includes: sensing a temperature of at least one heating component included in a circuit module for driving the panel; And adjusting the driving waveform of the panel according to the sensed temperature of the heat generating component.

Here, the temperature sensing step may include sensing the temperature of the data driver IC, including sensing the temperature of the scan driver IC, or sensing the temperature of the sustain pulse supply FET. It may be to include.

The driving waveform adjusting step may be to adjust the number of sustain pulses, adjust the video signal level, or increase or decrease the gray level according to the temperature of the one or more heating parts.

Meanwhile, the temperature sensing step may be to divide the circuit module into several parts and to sense the temperature of the heat generating parts belonging to each of the partitioned parts.

At this time, the step of adjusting the drive waveform, the temperature detected from each part partitioned in the circuit module divided into several reference intervals, and the predetermined drive waveform according to the temperature of each part and the reference interval to which the temperature belongs. It may be to adjust.

According to a second aspect of the present invention, there is provided a driving apparatus of a plasma display panel, comprising: means for detecting a temperature mounted on at least one heating component provided in a circuit module for driving the panel; And control means for adjusting the drive waveform of the panel according to the sensed temperature of the heat generating component.

Here, the temperature sensing means may be to sense the temperature of the heat generating parts belonging to each part of the circuit module divided into several parts.

On the other hand, the control means, by dividing the temperature detected from each part partitioned in the circuit module into several reference intervals, and the predetermined drive waveform according to the temperature of each partitioned portion and the reference interval to which the temperature belongs It may be to adjust.

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

5 shows an embodiment of the PDP driving apparatus of the present invention. The PDP driving apparatus of the illustrated embodiment includes a scan driving circuit 20, a sustain driving circuit 30, and a data drive circuit 40 as in the basic arrangement of the general driving circuit shown in FIG. 1.

The scan drive circuit 20 includes an energy recovery circuit 21, a first switch Y1, and a second switch Y2 related to the supply of the sustain pulse and the energy recovery operation during the sustain period. The scan drive circuit 20 also includes a Y-rising ramp waveform generator 23, a first capacitor C1 and a first diode D1 that are involved in the generation of a ramp SETUP waveform during the initialization period. And a Y-fall ramp waveform generator 25 that is involved in the generation of the ramp SETdown waveform during the initialization period.

In addition, the scan driving circuit 20 applies the scan switch Ysc, the second diode D2, the second capacitor C2, and the scan low switch Yscl that are involved in the sequential selection operation of each address line during the scan period. Equipped. Furthermore, a pass bottom switch Yb and a pass top switch Yt are provided for appropriately turning on / off the path between the respective circuit portions during each period during the driving.

Generally, the circuit configuration illustrated above is mounted on the Y drive board 121 shown in FIG. In addition, the scan driving IC 27 directly connected to the scan electrodes of the AC PDP 10 at the end of the scan driving circuit 20 is usually mounted on the scan buffer board 122 of FIG.

On the other hand, the sustain drive circuit 30 includes an energy recovery circuit 31 related to the supply and the energy recovery operation of the sustain pulse during the sustain period, and a first switch Y1 and a second switch Y2. The sustain drive circuit 30 is generally mounted on the Z drive board 130 of FIG. 4. The data driver circuit 40 mounted on the data driver board 140 is provided with a data driver IC to supply image data to the data electrodes during the address period.

The circuit configurations of the scan driving circuit 20, the sustain driving circuit 30, and the data driver circuit 40 described above are one example in general, and many various applications and modifications are known in the art.

Part of the PDP driving device that greatly affects the reliability of driving is particularly the data driver IC 40, the FETs (Y1, Y2 and FETs in the energy recovery circuit) related to the output of the sustain pulse, the scan driving IC ( 27) and so on. Since the above-described driving method for temperature compensation is not a method of directly monitoring each heating component, the number of sustain pulses is adjusted by sensing the temperature of the entire atmosphere or the panel temperature as a result of driving. Since it was a way of doing this, there existed a problem that exact temperature control and optimal correspondence were difficult. Therefore, as the number of sustain pulses decreases, an unnecessary level of luminance decreases or a failure occurs due to a temperature rise of each driving IC, and thus there is a limit in securing reliability of each component.

In the present invention, as shown in FIG. 5, the temperature of the heat generating component in each driving circuit is directly sensed. For example, the first sensing signal S1 is sensed by sensing the temperature of the FETs related to the supply of the sustain pulse, and the second sensing signal S2 is scanned by sensing the temperature of the heating component related to the generation of the setup waveform. Sensing the temperature of the driving IC to sense the third sensing signal S3, sensing the temperature of the data driver IC to sense the fourth sensing signal S4, and the temperature of the FETs related to the output of the sustain pulse in the sustain driving circuit. To output the fifth sensing signal S5. Appropriate sensing positions and target heat generating components may be appropriately selected as necessary. For this purpose, a representative device that most influences the reliability of driving may be selected through experiments.

The temperature sensor is preferably mounted directly on each heat generating component. For temperature sensors, not only conventional bimetals, thermocouples, thermistors, resistance temperature sensors, etc., but also IC temperature sensors using P-N junctions can be utilized. In particular, the IC temperature sensor has an advantage that it is easy to integrate into each heat generating component.

The controller 50 shown in FIG. 5 inputs temperature sensing signals sensed from each heat generating component to adjust driving waveforms to compensate for temperature or prevent deterioration of PDP driving characteristics due to high temperature. The adjustment of the drive waveform may be used alone or in combination with increasing or decreasing sustain pulses, increasing or decreasing gray levels, adjusting video signal levels, or other suitable manner. On the other hand, the reset waveform adjustment scheme such as increasing or decreasing the slope of the reset ramp waveform, the highest voltage level, or the like may also be applied alone or in combination with others as necessary.

6A to 6C are diagrams for illustrating various methods for generating a waveform adjustment signal in the controller 50 of the PDP driving apparatus of the present invention. An input circuit 340 is configured to input a temperature sensing signal (temperature sensor output) into the controller 50, and a switching circuit 320 is configured between the output of the input circuit 340 and the ground terminal 315. do. The input circuit 340 compares the reference temperature value 330 with the temperature sensor output and outputs the result to the switching circuit 320, and a control signal is output from the output terminal 310 of the switching circuit 320. Output to the circuit part. If necessary, as shown in Figs. 6B and 6C, signals sensed from several sensors may be combined through a logic circuit to adjust appropriate driving waveforms, respectively.

7 is a flowchart illustrating an embodiment of a PDP driving method of the present invention. As shown in the drawing, the PDP driving method of the present invention inputs temperature data for each pre-selected heat generating component at every frame (S10), and generates each current heat on a predetermined look-up table based on the respective temperatures. Determining a section corresponding to the temperature of the component (S20), adjusting the driving waveform according to the setting value of the corresponding section stored in the form of a look-up table (S30), and each driving circuit according to the adjusted driving waveform The control signal may be output to (S40), and then the process may proceed to the next frame.

Here, the look-up table stored in the controller 50 may include, for example, the following data.

FET temperature range for sustain pulses Data Driver IC Temperature Range Scan Drive IC Temperature Range Holding Pulse Count Adjustment Factor Video signal level adjustment factor    (High temperature) w ℃ ~ x ℃  w ℃ ~ x ℃ w ℃ ~ x ℃ 0.74 0.80 x ℃ ~ y ℃ 0.76 0.85 y ℃ ~ z ℃ 0.78 0.90  x ℃ ~ y ℃ w ℃ ~ x ℃ 0.80 0.95 x ℃ ~ y ℃ 0.82 1.0 y ℃ ~ z ℃ 0.84 1.05  y ℃ ~ z ℃ w ℃ ~ x ℃ 0.86 1.10 x ℃ ~ y ℃ 0.88 1.15 y ℃ ~ z ℃ 0.90 1.20    (Medium) x ℃ ~ y ℃  w ℃ ~ x ℃ w ℃ ~ x ℃ 0.92 0.80 x ℃ ~ y ℃ 0.94 0.85 y ℃ ~ z ℃ 0.96 0.90  x ℃ ~ y ℃ w ℃ ~ x ℃ 0.98 0.95 x ℃ ~ y ℃ 1.0 1.0 y ℃ ~ z ℃ 1.02 1.05  y ℃ ~ z ℃ w ℃ ~ x ℃ 1.04 1.10 x ℃ ~ y ℃ 1.06 1.15 y ℃ ~ z ℃ 1.08 1.20    (Low temperature) y ℃ ~ z ℃  w ℃ ~ x ℃ w ℃ ~ x ℃ 1.1 0.80 x ℃ ~ y ℃ 1.12 0.85 y ℃ ~ z ℃ 1.14 0.90  x ℃ ~ y ℃ w ℃ ~ x ℃ 1.16 0.95 x ℃ ~ y ℃ 1.18 1.0 y ℃ ~ z ℃ 1.2 1.05  y ℃ ~ z ℃ w ℃ ~ x ℃ 1.22 1.10 x ℃ ~ y ℃ 1.24 1.15 y ℃ ~ z ℃ 1.26 1.20

As illustrated in the look-up table, several sections are set based on the temperature of the heating components in each driving circuit, and corresponding driving waveform adjustment factors (for example, sustain pulse number adjustment factors or The control unit 50 can set the video signal level adjustment factor and increase or decrease the number of sustain pulses and the video signal level according to the factor.

In addition, it may be possible to set the temperature range differently than illustrated above, and various modifications may be made in determining which parameter to adjust to adjust the driving waveform.

8 illustrates a change in driving waveform as the level of the video signal is increased or decreased. Originally, in the case of a frame that needs to be driven as shown in FIG. 8A, when a temperature rise of the data drive IC or the sustain pulse FET is detected, the frame can be displayed by reducing the level of the video signal as shown in (b). Can be.

In addition, Fig. 9 shows the change of the driving waveform according to the gradation increase and decrease. Originally, in the case of a frame that needs to be driven as shown in FIG. 9B, when a temperature rise of the sustain pulse FET is detected, the frame may be displayed with a higher gray number as shown in (a). In this way, the total length of the initialization section and the address section per frame becomes long, and the length of the sustain section becomes relatively short, thereby suppressing the temperature rise of the sustain pulse FET.

  In addition, in the case of a frame that is originally to be driven as shown in FIG. 9A, when a temperature rise of the data drive IC is detected, the frame may be displayed with a lower gray level as shown in (b). In this way, the total length of the initialization section and the address section per frame is reduced, thereby suppressing the temperature rise of the data drive IC.

The AC PDP driving method and driving apparatus of the present invention can be modified and applied in various forms within the scope of the technical idea of the present invention. After all, the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, and are not intended to limit the scope of the technical idea of the invention, the scope of the present invention is not limited to the claims described below, but equivalent to them. It should be judged including the scope.

According to the present invention, the temperature of a heat generating component having a high degree of heat generation such as a sustain pulse supply FET, a data driver IC, and a scan IC included in a driving circuit having a high influence on the driving reliability of the AC PDP is directly sensed and driven by the AC PDP. Will be reflected in.

In addition, the present invention provides a PDP driving method and a driving apparatus for sensing the temperature of the heat generating component included in the driving circuit and appropriately controlling the driving waveform to mitigate the cause of heat generation.

Furthermore, according to the present invention, the temperature of the heat generating component included in the driving circuit is sensed, and accordingly, the temperature is controlled by increasing or decreasing the number of sustain pulses, increasing or decreasing the video signal level, or securing the reliability of the AC PDP driving. It is possible to achieve a more natural brightness by driving with a variable luminance and a signal level applied.

Claims (11)

In the driving method of the plasma display panel, Sensing a temperature of at least one heating component included in a circuit module for driving the panel; And And adjusting a driving waveform of the panel according to the sensed temperature of the heat generating component. The method of claim 1, The temperature sensing step includes the step of sensing the temperature of the data driving IC. The method of claim 1, The temperature sensing step includes the step of sensing the temperature of the scan driving IC. The method of claim 1, The temperature sensing step includes the step of sensing the temperature of the sustain pulse supply FET. The method of claim 1, In the driving waveform adjusting step, the number of sustain pulses is adjusted according to the temperature of the one or more heating parts. The method of claim 1, The driving waveform adjusting step, the gray scale is increased or decreased according to the temperature of the at least one heat generating component. The method of claim 1, In the temperature sensing step, the circuit module is divided into several parts, and the method of driving a plasma display panel, characterized in that for sensing the temperature of the heating components belonging to each of the partitioned parts. The method of claim 7, wherein The driving waveform adjusting step may be performed by dividing a temperature detected from each part partitioned in the circuit module into several reference sections, and adjusting the temperature of each part and a predetermined driving waveform according to the reference section to which the temperature belongs. A driving method of a plasma display panel, characterized in that. In the driving apparatus of the plasma display panel, Means for sensing a temperature mounted on at least one heating component provided in a circuit module for driving the panel; And And control means for adjusting the driving waveform of the panel according to the sensed temperature of the heat generating component. The method of claim 9, And the temperature sensing means senses a temperature of heat generating parts belonging to each part of the circuit module partitioned into several parts. The method of claim 10, The control means divides the temperature sensed from each part partitioned in the circuit module into several reference sections, and adjusts the temperature of each partitioned section to a predetermined drive waveform according to the reference section to which the temperature belongs. A drive device for a plasma display panel.

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