JP2001134197A - Temperature compensating device and temperature compensating method for display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature compensating device and a temperature compensating method of a display panel capable of protecting the display panel by compensating the temperature of the display panel without using a temperature detector. SOLUTION: This device and method protect a PDP(plasma display panel) 106 by counting a time when the luminance detected by a luminance detector 115 or the like exceed prescribed values as a duration with a time counting part 121 and by estimating the temperature of the PDP 106 with a microcomputer 120 while using the detected luminance or the like and the duration of the luminance and by controlling the luminance with a signal processing part 101 or the like based on the result of the estimation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature compensation device and a temperature compensation method for compensating a temperature of a display panel.

[0002]

2. Description of the Related Art As a conventional temperature compensating device for compensating the temperature of a display panel, for example, the one described in Japanese Patent Application Laid-Open No. 9-6283 is known.

FIG. 2 is a block diagram showing the configuration of the temperature compensating device described in the above publication. The conventional temperature compensation device shown in FIG. 2 is a PDP (Plasma Display Panel)
1, an address driver 3 for driving the PDP 1, an X common driver 4, a Y scan driver 6, and a Y common driver 7, and a control circuit 2 for processing display data and controlling the drivers 3, 4, 6, 7 and the like. Temperature detectors 5, 8, and 10 for detecting the temperatures of the X common driver 4, the Y common driver 7 and the PDP 1, a panel heating device 9 for heating the PDP 1, and a driving pulse of each driving pulse applied to the PDP 1. A voltage conversion unit 40 for converting a voltage, an LED (light emitting diode) 70 for displaying a warning, an air cooling device 80 including a fan and the like, and a power supply for supplying power to the entire device are turned on / off.
A relay control unit 91 for turning off the power supply and a microcomputer (microcomputer) 90 for controlling the entire apparatus are provided.

[0004] In the temperature compensating device shown in FIG.
Due to a temperature change (rise) of the X common driver 4 and the Y common driver 7, the discharge characteristics of the PDP 1 and the characteristics of driving elements such as FETs (field effect transistors) constituting the X common driver 4 and the Y common driver 7 change. And PD
The luminance of P1 changes and PDP1 deteriorates. For this reason, in the temperature compensation device shown in FIG. 2, the temperature compensation of the PDP 1 is performed as described below to protect the PDP 1.

The temperatures of the PDP 1, the X common driver 4 and the Y common driver 7 are directly detected by the temperature detectors 10, 5 and 8, and the control circuit 2 controls the number of sustain discharge pulses based on the detected temperatures. The brightness of the PDP 1 is corrected by controlling the sustain discharge voltage or controlling the gradation value of the display data. In addition to the brightness control described above, based on the detected temperature, cooling of the entire device by the air cooling device 80, heating of the PDP 1 by the heating device 9, warning to the user by the LED 70, or shutting off the power by the relay control unit 91 To protect PDP1.

[0006]

However, when the temperature is detected by the temperature detector as described above, the detection result varies depending on the place where the temperature detector is mounted, and it is necessary to accurately compensate the temperature of the PDP 1. Can not. Further, in order to prevent a characteristic change or panel deterioration due to a local temperature rise of the PDP 1, a plurality of temperature detectors must be attached, which complicates the configuration of the device and increases the cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display panel temperature compensating device and a temperature compensating method capable of compensating a temperature of a display panel and protecting the display panel without using a temperature detector.

Another object of the present invention is to provide a display panel capable of compensating for the temperature of the display panel and protecting the display panel even if the temperature of the display panel changes locally without using a temperature detector. To provide a temperature compensation device and a temperature compensation method.

[0009]

Means for Solving the Problems (1) First invention A temperature compensation device for a display panel according to a first invention comprises a detecting means for detecting temperature information which can be converted into a temperature of the display panel, and a detecting means. A counting means for counting the duration of the detected temperature information; and a compensation means for compensating the temperature of the display panel according to the temperature information detected by the detection means and the duration counted by the counting means. .

In the display panel temperature compensating apparatus according to the present invention, the temperature of the display panel is estimated by detecting temperature information which can be converted into the temperature of the display panel and counting the duration of the detected temperature information. can do. Therefore, by compensating the temperature of the display panel in accordance with the temperature information and the duration, it is possible to protect the display panel by compensating the temperature of the display panel without using a temperature detector.

(2) Second invention The temperature compensation device for a display panel according to the second invention is the same as the temperature compensation device for a display panel according to the first invention,
The information processing apparatus further includes a distribution detecting unit configured to detect a distribution and an area of the temperature information detected by the detecting unit on the display panel, wherein the compensating unit is configured to detect the temperature information detected by the detecting unit and the temperature information detected by the distribution detecting unit. The temperature of the display panel is compensated according to the distribution and the area and the duration counted by the counting means.

In this case, the distribution and area of the temperature information on the display panel are detected, and the temperature of the display panel is compensated according to the temperature information, the distribution and area of the temperature information, and the duration. Therefore, even when the display is locally performed at a high luminance for a long time and the temperature of the display panel is locally increased, the temperature of the display panel can be compensated.
Therefore, even if the temperature of the display panel changes locally, the temperature of the display panel can be compensated and the display panel can be protected without using a temperature detector.

(3) Third invention A temperature compensation device for a display panel according to a third invention is the configuration of the temperature compensation device for a display panel according to the first or second invention. It includes a luminance detecting means for detecting luminance.

In this case, since the luminance of the display panel is directly detected, the temperature can be estimated from the luminance with little detection variation, and the temperature of the display panel can be estimated with high accuracy.

(4) Fourth Invention A temperature compensation device for a display panel according to a fourth invention is the temperature compensation device for a display panel according to the first or second invention. It includes data detection means for detecting display data to be displayed.

In this case, since the display data displayed on the display panel is detected, the luminance can be estimated from the gradation data of the display data, and the temperature of the display panel can be estimated.

(5) Fifth Invention A temperature compensation device for a display panel according to a fifth invention is the configuration of the temperature compensation device for a display panel according to the first or second invention. It includes pulse detection means for detecting the number of applied drive pulses.

In this case, since the number of drive pulses applied to the display panel is detected, the luminance can be estimated from the number of pulses, and the temperature of the display panel can be estimated.

(6) Sixth invention A temperature compensation device for a display panel according to a sixth invention is the configuration of the temperature compensation device for a display panel according to the first or second invention. It includes current detection means for detecting the drive current of the applied drive pulse.

In this case, since the drive current of the drive pulse applied to the display panel is detected, the luminance can be estimated from the drive current, and the temperature of the display panel can be detected.

(7) Seventh invention The temperature compensation device for a display panel according to the seventh invention comprises
In the configuration of the temperature compensation device for a display panel according to any one of the sixth inventions, the compensation means includes a luminance control means for controlling the luminance of the display panel.

In this case, since the brightness of the display panel is controlled in accordance with the temperature information and the duration, or the temperature information, the distribution and area of the temperature information, and the duration, the display is performed with high brightness for a long time. If the temperature of the display panel rises, or if the display panel is locally displayed with high brightness for a long time and the display panel temperature rises partially, the brightness of the display panel is reduced to lower the display panel temperature. Can be done.

(8) Eighth Invention A temperature compensation device for a display panel according to an eighth invention is the temperature compensation device for a display panel according to the seventh invention, wherein:
The brightness control means includes a pulse control means for controlling the number of drive pulses applied to the display panel.

In this case, since the number of driving pulses applied to the display panel is controlled in accordance with the temperature information and the duration, or the distribution and area of the temperature information, the temperature information, and the duration, the luminance is high for a long time. When the display is performed and the temperature of the display panel rises, or when the display is locally displayed at high brightness for a long time and the temperature of the display panel partially increases, the number of drive pulses is reduced. Thus, the temperature of the display panel can be reduced.

(9) Ninth Invention A temperature compensation device for a display panel according to a ninth invention is the same as the temperature compensation device for a display panel according to the seventh invention,
The brightness control means includes a voltage control means for controlling the voltage of the drive pulse applied to the display panel.

In this case, since the voltage of the drive pulse applied to the display panel is controlled in accordance with the temperature information and the duration, or the temperature information, the distribution and area of the temperature information, and the duration, the luminance is high for a long time. When the display is performed and the temperature of the display panel rises, or when the display is locally performed at a high luminance for a long time and the display panel temperature partially increases, the voltage of the driving pulse is reduced. The temperature of the display panel can be reduced.

(10) Tenth Invention The temperature compensation device for a display panel according to the tenth invention has a tenth invention.
In the configuration of the temperature compensation device for a display panel according to the invention, the brightness control means includes data control means for controlling display data displayed on the display panel.

In this case, since the display information displayed on the display panel is controlled in accordance with the temperature information and the duration, or the temperature information, the distribution and the area of the temperature information, and the duration, the display can be performed with high luminance for a long time. The brightness of the display data displayed on the display panel when the display panel temperature rises or when the display panel is locally heated at a high brightness for a long time and the display panel temperature rises partially And the temperature of the display panel can be reduced.

(11) Eleventh Invention A temperature compensation device for a display panel according to an eleventh invention is characterized in that the
In the configuration of the temperature compensation device for a display panel according to any one of the sixth to sixth inventions, the compensation means includes a cooling means for cooling the display panel.

In this case, since the display panel is cooled according to the temperature information and the duration, or the temperature information, the distribution and the area of the temperature information, and the duration, the display is performed with high luminance for a long time, and the temperature of the display panel is reduced. Rises,
Alternatively, when display is locally performed with high luminance for a long time on the display panel and the temperature of the display panel partially increases, the display panel can be cooled to lower the temperature of the display panel.

(12) Twelfth Invention A temperature compensation device for a display panel according to a twelfth invention is characterized in that:
In the configuration of the temperature compensation device for a display panel according to any one of the sixth to sixth inventions, the compensation means includes a warning means for performing a warning display for a temperature rise of the display panel.

In this case, a warning display for the temperature rise of the display panel can be displayed in accordance with the temperature information and the duration, or the temperature information, the distribution and the area of the temperature information, and the duration. The temperature of the display panel has risen if the display panel temperature has risen or if the display panel temperature has risen partially due to local high-brightness display on the display panel for a long time. Can be warned to the user.

(13) Thirteenth Invention A temperature compensation device for a display panel according to a thirteenth invention comprises a
In the configuration of the temperature compensation device for a display panel according to any one of the sixth to sixth inventions, the compensation means includes a disconnection means for cutting off a power supply for supplying power to the display panel.

In this case, the power supply for supplying power to the display panel can be cut off in accordance with the temperature information and the duration, or the temperature information, the distribution and area of the temperature information, and the duration. When the display panel temperature rises, or when the display panel is locally displayed with high brightness for a long time and the display panel temperature rises partially, the power supply that supplies power to the display panel is turned off. It can be turned off and the temperature of the display panel can be reduced.

(14) Fourteenth Invention The temperature compensation device for a display panel according to the fourteenth invention is characterized in that
In the configuration of the temperature compensation device for a display panel according to any one of the sixth to sixth inventions, the compensation means includes a heating means for locally heating the display panel.

In this case, the display panel can be locally heated in accordance with the temperature information, the distribution and area of the temperature information, and the duration, so that the display is locally displayed on the display panel with high luminance for a long time. When the temperature of the display panel partially increases, a portion where the temperature does not increase can be heated, and a temperature difference in the display panel can be eliminated.

(15) Fifteenth Invention A temperature compensation method for a display panel according to a fifteenth invention comprises a step of detecting temperature information which can be converted into a temperature of the display panel, and a continuation of the temperature information detected by the detection step. The method includes a step of counting time and a step of compensating for the temperature of the display panel according to the temperature information detected by the detection step and the duration counted by the counting step.

In the display panel temperature compensation method according to the present invention, the temperature of the display panel is estimated by detecting temperature information that can be converted to the temperature of the display panel and counting the duration of the detected temperature information. can do. Therefore, by compensating the temperature of the display panel in accordance with the temperature information and the duration, it is possible to protect the display panel by compensating the temperature of the display panel without using a temperature detector.

(16) Sixteenth Invention A temperature compensation method for a display panel according to a sixteenth invention is directed to the first invention.
In the configuration of the display panel temperature compensation method according to the fifth aspect, the method further includes a step of detecting a distribution and an area of the temperature information detected by the detection step on the display panel, wherein the compensation step includes the step of detecting the temperature detected by the detection step. The method includes a step of compensating the temperature of the display panel according to the information, the distribution and area of the temperature information detected by the distribution and area detection step, and the duration counted by the counting step.

In this case, the distribution and the area of the temperature information on the display panel are detected, and the temperature of the display panel is compensated according to the temperature information, the distribution and the area of the temperature information and the duration. Even when the display is locally performed with high luminance for a long time and the temperature of the display panel partially rises, the temperature of the display panel can be compensated. Therefore, even if the temperature of the display panel changes locally, the temperature of the display panel can be compensated and the display panel can be protected without using a temperature detector.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plasma display device will be described as an example of a display panel temperature compensating device according to the present invention. FIG. 1 is a block diagram showing a configuration of a plasma display device according to one embodiment of the present invention. In the drawing, thin arrows indicate the flow of signals, and thick arrows indicate the flow of power.

The plasma display device shown in FIG. 1 includes a signal processing unit 101, a control circuit 102, and an address driver 10.
3. Scan driver 104, sustain driver 10
5, PDP (plasma display panel) 106, relay control unit 110, voltage conversion unit 111, discharge current detection circuit 112, warning display device 113, cooling device 114, brightness detector 115, panel heating device 116, and microcomputer (microcomputer) 120. Microcomputer 1
20 includes a time counting section 121 and a luminance distribution detecting section 122 as its functions.

The PDP 106 has a plurality of address electrodes (data electrodes) 131 and a plurality of scan electrodes (scan electrodes) 1.
32 and a plurality of sustain electrodes (sustain electrodes) 133. The plurality of address electrodes 131 are arranged in the vertical direction of the screen, and the plurality of scan electrodes 132 and the plurality of sustain electrodes 133 are arranged in the horizontal direction of the screen. The plurality of sustain electrodes 133 are commonly connected. Address electrode 131, scan electrode 132
And the intersection of the sustain electrode 133 with the discharge cell 1
34 are formed, and each discharge cell 134 constitutes a pixel on the screen.

The relay control section 110 is supplied with a predetermined high voltage power PS from an external power supply, and turns on / off the supply of power to the entire apparatus. Voltage conversion section 111 converts high-voltage power output from relay control section 110 to high-voltage power for generating each drive pulse applied to PDP 106.
The discharge current detection circuit 112 outputs the high-voltage power output from the voltage conversion unit 111 to the control circuit 102,
The discharge current of scan electrode 132 and sustain electrode 133 during the sustain period is detected, and the detection result is output to microcomputer 1
Output to 20.

The display data VD is input to the signal processing unit 101, and the signal processing unit 101 performs a predetermined process on the display data VD and outputs the processed data to the control circuit 102. The control circuit 102 receives the high-voltage power input from the voltage conversion unit 111 via the discharge current detection circuit 112, and uses display data signal-processed by the signal processing unit 101,
Each control signal for controlling the address driver 103, the scan driver 104, and the sustain driver 105 and high-voltage power for driving each driver are output to each driver. Further, the control circuit 102 outputs the number of sustain pulses in the sustain period to the microcomputer 120.

The address driver 103 includes a PDP 106
Of the control circuit 10
In accordance with the control signal output from Step 2, a write pulse is applied to the corresponding address electrode 131 during a write period. The scan driver 104 is connected to each scan electrode 1
In the writing period, each driving circuit is connected to the scan electrode 132, and in accordance with a control signal output from the control circuit 102,
A write pulse is sequentially applied to the plurality of scan electrodes 132 while shifting the shift pulse in the vertical scanning direction. Thus, an address discharge is performed in the corresponding discharge cell 134.

In accordance with a control signal output from the control circuit 102, the scan driver 104 applies a periodic sustain pulse to the plurality of scan electrodes 132 during the sustain period.
Is applied. On the other hand, the sustain driver 105 is connected to the plurality of sustain electrodes 133 and, in accordance with a control signal output from the control circuit 102, causes the plurality of sustain electrodes 133 to have a phase of 180 degrees with respect to the sustain pulse of the scan electrode 132 during the sustain period. The shifted sustain pulses are applied simultaneously. As a result, sustain discharge is performed in the corresponding discharge cell 134.

The warning display device 113 is constituted by an LED (light emitting diode) or the like, and performs a predetermined warning display under the control of the microcomputer 120. Cooling device 114 cools PDP 106 under the control of microcomputer 120. Luminance detector 115 detects the luminance of the display screen of PDP 106 and outputs the detection result to microcomputer 120. The panel heating device 116 controls the PDP 1 under the control of the microcomputer 120.
06 is heated locally.

The microcomputer 120 controls the entire apparatus, and displays the display data VD, the luminance data output from the luminance detector 115, the number of sustain pulses output from the control circuit 102, and the discharge current detection circuit as temperature information. 112
When the discharge current of the sustain period output from the controller is input and each input exceeds a predetermined threshold, the duration of each data is counted by the time counter 121.

The luminance distribution detecting section 122 includes a microcomputer 120
The distribution and area of each data on the PDP 1 are obtained based on each data input to the PDP 1. For example, each data of one screen is once taken into the memory, and the display screen is divided into nine areas (vertical 3).
(Divided into three areas in the horizontal direction), each data is made to correspond to each area, and the distribution and area of each data on the display screen are detected.

The microcomputer 120 increases or decreases the sustain pulse based on the input data and the duration counted by the time counting unit 121 or the input data, the distribution and area of the data, and the duration. By controlling the control circuit 102 for control, the voltage conversion unit 111 for controlling increase / decrease of the voltage of the sustain pulse, and the signal processing unit 101 for control of gradation of display data, the brightness of the PDP 106 is controlled. Control. Further, the microcomputer 120 controls the warning display device 113, the cooling device 114, and the relay control unit 110 based on the input data and the duration or the input data, the distribution and the area of the data, and the duration. Control.

Further, the microcomputer 120 controls the panel heating device 116 based on each input data, distribution and area of each data, and duration. The panel heating device 116 includes a heater attached to each area divided by the luminance distribution detecting unit 122,
Under the control of 20, each area is individually heated by turning on or off each heater independently.

In this embodiment, the control circuit 102
The discharge current detection circuit 112, the luminance detector 115, and the microcomputer 120 each correspond to a detection unit, and the time counting unit 1
Reference numeral 21 corresponds to a counting unit, and each of the signal processing unit 101, the control circuit 102, the relay control unit 110, the voltage conversion unit 111, the warning display unit 113, the cooling unit 114, the panel heating unit 116, and the microcomputer 120 serves as a compensation unit. Equivalent to. The luminance distribution detecting section 122 corresponds to distribution detecting means, the luminance detector 115 corresponds to luminance detecting means, the microcomputer 120 corresponds to data detecting means, the control circuit 102 corresponds to pulse detecting means, and the discharge current The detection circuit 112 corresponds to a current detection unit. The signal processing unit 101, the control circuit 102, and the voltage conversion unit 111 each correspond to a luminance control unit, the control circuit 102 corresponds to a pulse control unit, the voltage conversion unit 111 corresponds to a voltage control unit, and the signal processing unit 101 corresponds to a data control unit. The cooling device 114 corresponds to a cooling unit, the panel heating device 116 corresponds to a heating unit, the warning display unit 113 corresponds to a warning unit, and the relay control unit 110 corresponds to a disconnecting unit.

Next, the temperature compensation operation of the plasma display device configured as described above will be described. The temperature compensation operation is divided into a detection operation of data that can be converted into a temperature used for the compensation operation and a compensation operation based on the detected data.

First, the operation of detecting data used for the compensation operation in the temperature compensation operation will be described. PDP10
When the cell 6 is driven, the energy of the electrons is high in the discharge cell 134 that is discharging, that is, in the light emitting portion, and heat is generated due to collision with a wall surface or the like. For this reason, in a portion with high luminance, the time during which light is emitted becomes longer, and the amount of heat generated also becomes larger,
The temperature of that part rises.

The gradation data in the display data VD corresponds to the luminance on a one-to-one basis. Even when the same gradation data is displayed, the luminance increases as the number of sustain pulses in one field period increases. And the calorific value increases. In addition, when the light emission time is long or the light emission area is large, the discharge current in the sustain period increases.

On the other hand, the temperature is determined by the light emitting time, and the duration of each data is an important factor for determining the temperature. Therefore, by detecting at least one of the luminance or data relating to the luminance, for example, display data, the number of sustain pulses, and the discharge current during the sustain period, the PDP 10 is determined based on the detected data and the duration thereof.
6 can be estimated. Therefore, in the present embodiment, a detection operation for detecting the following four types of data can be performed.

As a first data detecting operation, a luminance detecting operation will be described. The brightness detector 115 is a PDP1
06 is directly detected and output to the microcomputer 120, and the time counting unit 121 determines that the luminance is a predetermined value, for example, 250 cd /
If it exceeds m ² , counting is started, and the time exceeding a predetermined value is counted as the duration. The microcomputer 120 estimates the temperature of the PDP 106 by performing a predetermined calculation using the duration and the luminance at that time.

Next, a description will be given of a display data detection operation as a second data detection operation. Microcomputer 120
Extracts the gradation data from the input display data VD. When the gradation data exceeds a predetermined gradation value, the time counting unit 121 starts counting and continues the time when the gradation data exceeds the predetermined value. Count as time. The microcomputer 120 estimates the temperature of the PDP 106 by performing a predetermined calculation using the duration and the gradation data at that time.

Next, as a third data detection operation, an operation of detecting the number of sustain pulses in the sustain period will be described. The control circuit 102 outputs the number of sustain pulses in the sustain period to the microcomputer 120, and the time counting unit 121
Starts counting when the number of sustain pulses exceeds a predetermined value, for example, the total number of pulses in one field exceeds 1024, and counts the time that exceeds the predetermined value as the duration. The microcomputer 120 estimates the temperature of the PDP 106 by performing a predetermined calculation using the duration and the number of sustain pulses at that time.

Finally, as a fourth data detection operation, a description will be given of a discharge current detection operation in the sustain period. The discharge current detection circuit 112 detects the discharge current in the sustain period and outputs the same to the microcomputer 120. The time counting unit 121 starts counting when the discharge current exceeds a predetermined value, for example, 0.9 A, and The time during which the value is exceeded is counted as the duration. The microcomputer 120 performs a predetermined calculation using the duration and the discharge current at that time to obtain the PD.
The temperature of P106 is estimated.

Next, the operation of detecting the distribution and area of each data will be described. When the image displayed on the PDP 106 is an image having a luminance peak pattern having a display area of 10 to 20% with respect to a black background image, for example,
The temperature of the PDP 106 does not rise in the black part, and rises in the white part. As a result, a temperature difference occurs locally,
When the temperature difference increases, the PDP 106 deteriorates.
This deterioration is caused by a place where a temperature difference occurs, for example, PDP 10
6 depending on the center or end.

The luminance distribution detecting section 122 includes a microcomputer 120
Each of the above data input to the memory is once fetched into the memory for one screen, and, for example, the display screen is divided into nine areas (vertical divided into three and horizontal divided into three), and each data inputted to each area is divided. Detect the distribution and area on the display screen. The microcomputer 120 calculates each data, the area and distribution of each data,
Further, the temperature of each region of the PDP 106 is estimated based on the duration.

In the above data detecting operation, if at least one data is detected, a compensating operation to be described later can be performed using the data, and the data detecting operation can be arbitrarily combined to achieve higher accuracy. The temperature may be able to be estimated in advance. Also, when the following compensation operations are set in advance for the above data,
Instead of estimating the temperature of the PDP 106, the following compensation operations may be performed using the above data directly.

Next, five types of compensation operations based on the data detected as described above will be described. First, as a first compensation operation, a compensation operation by luminance control will be described. The compensation operation by the brightness control includes the following 3
There are different types of brightness control operations.

First, as a first luminance control operation, a gradation control operation of display data by the signal processing unit 101 will be described. When the microcomputer 120 determines that it is necessary to perform the brightness control operation based on the data detection operation, the signal processing unit 101 controls the PDP 1 under the control of the microcomputer 120.
A predetermined calculation process is performed on the gradation data of the display data VD so that the luminance of the pixel data 06 decreases.
To reduce the brightness of the PDP 106,
The temperature of the PDP 106 is reduced.

Next, as a second luminance control operation, a luminance control operation by the control circuit 102 will be described. When the microcomputer 120 determines that it is necessary to perform the brightness control operation by the above data detection operation, the control circuit 102, under the control of the microcomputer 120, reduces the number of sustain pulses in the sustain period, thereby , And the temperature of the PDP 106 is reduced.

Next, as a third luminance control operation, a luminance control operation by the voltage conversion section 111 will be described. When the microcomputer 120 determines that it is necessary to perform the brightness control operation based on the data detection operation, the voltage conversion unit 111 controls the PDP 106 by lowering the voltage of the sustain pulse in the sustain period under the control of the microcomputer 120. , And the temperature of the PDP 106 is reduced.

By performing the brightness control as described above,
Display is performed for a long time at a high luminance, and the temperature of the PDP 106 and each driver rises to affect the panel characteristics and driver characteristics. Or, display is performed at a high luminance for a long time locally, and the display is locally performed within the PDP 106. If a significant temperature difference occurs, the brightness is reduced to prevent the temperature from rising,
106 can be protected. Note that the compensation operation by the brightness control is at least one of the three operations.
If one is used, the temperature of the PDP 106 can be compensated, and any combination can be used.

Next, a compensation operation by the warning display device 113 will be described as a second compensation operation. When the microcomputer 120 determines that a warning display needs to be performed by the above data detection operation, the warning display device 113 emits an LED, for example, to warn the user that the temperature of the PDP 106 is rising. Therefore, PDP10
6 can be warned to the user that the temperature is abnormal, and when the user turns off the power, the PDP 10 is turned off.
6 can be protected. Note that the warning display is not limited to the above-described lighting of the LED and the like, and may be performed by displaying the warning on the display screen by OSD (on-screen display) or the like.

Next, as a third compensation operation, the cooling device 1
14 will be described. When the microcomputer 120 determines that the PDP 106 needs to be cooled by the above data detection operation, the cooling device 114 directly cools the PDP 106 and each driver under the control of the microcomputer 120 to lower the temperature of the PDP 106, PDP
Protect 106.

Next, as a fourth compensation operation, a compensation operation by the relay control unit 110 will be described. When the microcomputer 120 determines that the power supplied to the PDP 106 needs to be cut off by the above-described data detection operation, the relay control unit 110 controls the PD under the control of the microcomputer 120.
The power supplied to P106 is turned off, the temperature of PDP 106 is reduced, and PDP 106 is protected.

In the above-described first to fourth compensation operations, when the compensation operation is performed also using the area and distribution of each data detected by the luminance distribution detection section 122, the compensation operation is performed for each divided region. Since the temperature can be estimated,
When display is locally performed at a high luminance on the PDP 106 for a long time and a local temperature difference occurs in the PDP 106, a compensation operation such as lowering the luminance is performed.
06 can be protected.

Finally, as a fifth compensation operation, a compensation operation by the panel heating device 116 will be described. When the microcomputer 120 determines that it is necessary to increase the temperature of a part of the PDP 106 to make the temperature uniform by the data detection operation using the luminance distribution detection unit 122 among the above data detection operations, specifically, When it is detected that the temperature difference between adjacent areas exceeds a predetermined value, for example, 15 ° C., the panel heating device 116 turns on the heater attached to the lower temperature area for a certain period of time. Increase the temperature in that area. As a result, the temperature difference on the PDP 106 is eliminated, and the PDP 106 can be protected. A plurality of energization patterns may be set in advance according to the temperature difference so that the time for turning on each heater increases or decreases according to the temperature difference. Further, when the heater is turned off from on, data representing the temperature rise corresponding to the time may be added to the temperature estimation data of the turned-on region, and the temperature rise of the panel due to the heater may be taken into account.

The above second to fifth compensation operations can be performed by using the PDP 106 if at least one of the above four operations is used.
, The second compensation operation and the third compensation operation, the third compensation operation and the fourth compensation operation, the second compensation operation and the fifth compensation operation, and the fourth compensation operation. Compensation operation and 5th
, The second compensation operation, the third compensation operation, the fourth compensation operation, and the combination of the second compensation operation, the fourth compensation operation, and the fifth compensation operation.

As described above, in the present embodiment, data relating to luminance is detected, the duration of the data is counted, the temperature of PDP 106 is estimated from the data and the counting time, and the PDP 106 is operated in accordance with the result. Because it can compensate for temperature, without using a temperature detector,
With a simple configuration and low cost, the temperature of the PDP 106 can be compensated and protected. Also, when detecting the distribution and area of the data regarding the luminance on the PDP 106,
Since it is possible to detect that the display panel is locally displayed with high luminance for a long time on the PDP 106 and the temperature of the display panel is locally increased, the PDP can be performed without using a temperature detector.
Even if the temperature of the PDP 106 changes locally, the temperature of the PDP 106 can be compensated and protected.

[0077]

According to the present invention, the temperature of the display panel is estimated by detecting the temperature information which can be converted into the temperature of the display panel and counting the duration of the detected temperature information. Since the temperature of the display panel can be compensated according to the duration and the duration, the temperature of the display panel can be compensated and the display panel can be protected without using a temperature detector.

When the distribution and the area of the temperature information on the display panel are detected, the temperature of the display panel can be compensated according to the temperature information, the distribution and the area of the temperature information and the duration. Even if the temperature of the display panel changes locally without using a device, the temperature of the display panel can be compensated to protect the display panel.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of a conventional plasma display device.

[Explanation of symbols]

 Reference Signs List 101 signal processing unit 102 control circuit 103 address driver 104 scan driver 105 sustain driver 106 PDP 110 relay control unit 111 voltage conversion unit 112 discharge current detection circuit 113 warning display device 114 cooling device 115 brightness detector 116 panel heating device 120 microcomputer 121 time Counting unit 122 Luminance distribution detecting unit

Continued on the front page (72) Inventor Akira Yawata 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 5C080 AA05 BB05 DD05 DD18 DD20 EE29 FF12 HH02 JJ02 5G435 AA12 BB06

Claims (16)

[Claims] A detecting means for detecting temperature information which can be converted into a temperature of a display panel; a counting means for counting a duration of the temperature information detected by the detecting means; and a temperature information detected by the detecting means. And a compensating means for compensating the temperature of the display panel according to the duration counted by the counting means. 2. The apparatus according to claim 1, further comprising a distribution detecting unit configured to detect a distribution and an area of the temperature information detected by the detecting unit on a display panel, wherein the compensating unit includes the temperature information detected by the detecting unit and the distribution. 2. The temperature compensating device for a display panel according to claim 1, wherein the temperature of the display panel is compensated according to the distribution and area of the temperature information detected by the detecting means and the duration counted by the counting means. . 3. The temperature compensation device for a display panel according to claim 1, wherein said detection means includes a luminance detection means for detecting luminance of the display panel. 4. The temperature compensation device for a display panel according to claim 1, wherein said detection means includes data detection means for detecting display data displayed on the display panel. 5. The temperature compensation device for a display panel according to claim 1, wherein said detection means includes pulse detection means for detecting the number of driving pulses applied to the display panel. 6. The temperature compensation device for a display panel according to claim 1, wherein said detection means includes current detection means for detecting a drive current of a drive pulse applied to the display panel. 7. The apparatus according to claim 1, wherein said compensation means includes a brightness control means for controlling the brightness of the display panel.
7. The temperature compensation device for a display panel according to any one of 6. 8. The temperature compensation device for a display panel according to claim 7, wherein said brightness control means includes pulse control means for controlling the number of driving pulses applied to the display panel. 9. The temperature compensation device for a display panel according to claim 7, wherein said brightness control means includes a voltage control means for controlling a voltage of a driving pulse applied to the display panel. 10. The display panel temperature compensating device according to claim 7, wherein said brightness control means includes data control means for controlling display data displayed on the display panel. 11. The temperature compensation device for a display panel according to claim 1, wherein said compensation means includes a cooling means for cooling the display panel. 12. The display panel temperature compensating device according to claim 1, wherein said compensating means includes a warning means for performing a warning display for a temperature rise of the display panel. 13. The display panel temperature compensating device according to claim 1, wherein said compensating means includes a cutting means for cutting off a power supply for supplying power to the display panel. 14. The apparatus according to claim 2, wherein said compensating means includes a heating means for locally heating the display panel.
6. The temperature compensation device for a display panel according to any one of 6. 15. A step of detecting temperature information that can be converted into a temperature of a display panel, a step of counting the duration of the temperature information detected by the detecting step, and a step of: Compensating the temperature of the display panel according to the duration counted in the counting step. 16. The method according to claim 16, further comprising a step of detecting a distribution and an area of the temperature information detected by the detecting step on the display panel, wherein the compensating step includes the temperature information detected by the detecting step and the distribution and area. 16. The display panel according to claim 15, further comprising a step of compensating a temperature of the display panel according to a distribution and an area of the temperature information detected in the detecting step and the duration counted in the counting step. Temperature compensation method.