JP4340342B2 - Plasma display device and control method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display device, and more particularly to a plasma display device having a control function capable of controlling power consumption and a control method thereof.
[0002]
[Prior art]
The plasma display is a flat display having display cells arranged on an XY orthogonal matrix, and uses a system in which a panel is provided with a memory function (address operation) for display. That is, this is a driving method in which the brightness (luminance) is determined by the number of sustain pulse waveforms applied after the address operation.
[0003]
Conventionally, the power consumption proportional to the brightness is detected by a current, and the number of sustain pulses is controlled so that the power consumption is not more than a desired constant value.
[0004]
[Problems to be solved by the invention]
A conventional plasma display device has a configuration as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-305321. This configuration will be described with reference to FIG.
[0005]
The plasma display device in the conventional example includes a current detection means 11 for detecting the current consumption of the device, a video interface 2 for inputting various video signals, a synchronization signal and a clock, a data processing unit 3, and X and Y electrodes. A drive control unit 4 that generates a sustain light emission pulse and an address driver drive waveform, a display panel 9, an address driver 7 that writes display data, an X driver 8 that drives the display panel, and a Y driver 6 ( Hereinafter, the X and Y drivers are collectively referred to as panel drive pulse generating means) and an MPU (Micro Processing Unit) 5 that performs various controls.
[0006]
Here, the current detection means 11 detects the current of the entire apparatus and performs control using the detection result. This point will be described with reference to FIG.
[0007]
In the graph shown in this figure, the vertical axis represents the sustain power Psus consumed by the display panel 9, the X driver 8 and the Y driver 6 due to the sustain light emission current, and the horizontal axis represents the address power due to the address current in the address operation. I'm taking Padd. Here, Psx represents the maximum allowable value of sustain power, and Pax represents the maximum allowable value of address power.
[0008]
In the conventional plasma display device, Psus and Padd occupy most of the power consumption of the entire device. Therefore, when the maximum power of the device is limited, the origin, Psx, or Pax in FIG. A triangular area surrounded by a 45-degree line passing through is a displayable area, and the hypotenuse is the point where the sum of the address power Padd and the sustain power Psus is constant. Therefore, when the limit value of the power consumption of the entire apparatus is increased, the area of the triangle increases accordingly.
[0009]
Here, it is necessary to control so that the sum of the sustain power Psus and the address power Padd does not exceed Psx and Pax. For example, if the power limit value is set to Psx + Pax, in region A, the sustain power Psus exceeds Psx, so that the panel input power may be excessive. In the area B, the address power Padd exceeds Pax, so that the power consumption of the address driver may be excessive. In the C area, both the address power and the sustain power are within the limit values, and display is possible, but the power consumption increases, and in order to display the entire C area, the power source capacity needs to be at least Psx + Pax.
[0010]
However, even if the power supply capacity is increased, only detecting the power of the entire device may cause excessive current to flow to the address driver as shown in area B or excessive sustain current as shown in area A. However, there is a possibility that the input power to the display panel becomes excessive without restriction. On the other hand, if the image is applied to the area C if the limit is too much, the brightness is lowered and the image becomes dark because the power limit is applied even though the sustain power and address power are both within the allowable values. there were.
[0011]
The present invention has been made in consideration of the above problems, and a plasma display device capable of more efficiently controlling power consumption while preventing damage to an address driver and display panel due to excessive power supply, and the plasma display device The object is to provide a control method.
[0012]
Another object of the present invention is to provide a plasma display device having means for detecting power consumption of the entire device, power consumption of an address driver, and sustain power for sustain discharge.
[0013]
Another object of the present invention is to provide a plasma display apparatus and a control method thereof that can control power consumption more efficiently by controlling the number of sustain pulses and the number of display bits.
[0014]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a plasma display panel, an address driver, panel drive pulse generation means, panel drive pulse generation means and drive control means for controlling the address driver, and overall control of the apparatus. In a plasma display device comprising a control means for performing an operation and an internal power supply, a value corresponding to power consumed by the plasma display device as a whole (hereinafter referred to as device power value), corresponding to power consumed by an address operation Power value acquisition means for respectively obtaining a value to be used (hereinafter referred to as an address power value) and a value (hereinafter referred to as a sustain power value) corresponding to the power consumed by the sustain light emission operation. .
[0015]
The power value acquisition unit detects, for example, the power consumed by the internal power source, thereby detecting the power consumed by the device power detection unit that acquires the device power value, and the address driver. Address power detection means for acquiring a power value, and sustain power detection means for acquiring the sustain power by detecting a power value consumed by the panel drive pulse generation means and the plasma display panel. The address power detection means may be configured to detect address power accompanying an address operation when displaying in the next frame from data supplied to the address driver.
[0016]
Further, the power value acquisition means detects only two of the device power value, the address power value, and the sustain power value, and calculates the remaining power value from the detected two power values. It is good also as a structure to require.
[0017]
The control means, for example, decreases the number of sustain emission pulses when the device power value exceeds a predetermined device power specified value, and when the sustain power value exceeds a predetermined sustain power specified value. Controls the number of sub-fields to be displayed when the address power value exceeds a predetermined address power prescribed value.
[0018]
In addition, when the address power value exceeds a predetermined address power specified value, the control means determines the number of subfields to be displayed until the address power value becomes equal to or less than the predetermined address power specified value. If the device power value exceeds the predetermined device power specified value, the number of sustain light emission pulses is decreased until the device power value is equal to or less than the predetermined device power specified value. Implement control to keep decreasing.
[0019]
In addition, when the address power value exceeds a predetermined address power specified value, the control means determines the number of subfields to be displayed until the address power value becomes equal to or less than the predetermined address power specified value. If the device power value exceeds the predetermined device power specified value, the subfield to be displayed until the device power value becomes equal to or less than the predetermined device power specified value. It is good also as a structure which implements control so that a number may continue decreasing.
[0020]
Further, in the plasma display device according to the invention, the acquired device power value and the sustain power value are respectively compared with a predetermined value corresponding to each of the acquired device power value and the acquired power value exceeding the specified value. It is good also as a structure further provided with the selection means which selects the one with a larger part and supplies to the said control means.
[0021]
In this case, the control means is configured to perform control so that the number of sustain light emission pulses continues to be decreased according to the output value from the selection means until the output value becomes equal to or less than a specified value corresponding thereto. It is preferable that
[0022]
In order to achieve the above object, the present invention provides a control method for a plasma display apparatus that displays a multi-gradation video signal by forming one frame with a plurality of subfields having different sustain light emission periods. A value corresponding to the power consumed as a whole (device power value), a value corresponding to the power consumed with the address operation (address power value), and a value corresponding to the power consumed with the sustain light emission operation ( The number corresponding to the at least one power value obtained from the number of fields to be displayed and the number of sustain light emission pulses in accordance with the obtained at least one power value. The power consumption is controlled by adjusting.
[0023]
Here, when the device power value exceeds a predetermined device power prescribed value, the number of sustain light emission pulses is controlled to be decreased, and the sustain power value exceeds a predetermined sustain power prescribed value Is controlled to decrease the number of sustain light emission pulses, and when the address power value exceeds a predetermined address power prescribed value, control is performed to decrease the number of subfields to be displayed.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 is a block diagram showing an embodiment of a plasma display device according to the present invention. The plasma display device 1 according to the present embodiment includes a video interface 2, a data processing unit 3, a drive control unit 4, an MPU 5, which functions as control means for the device, a Y driver 6, an address driver 7, and an X driver. 8, a display panel 9, power detection units 12, 14, 15, an internal power supply 13, a video signal input terminal 1 a, a synchronization signal clock input terminal 1 b, and a power input terminal 1 c.
[0026]
The video data input from the video input terminal 1a is subjected to analog-digital conversion (A / D conversion) after adjusting the number of pixels, signal level, etc. in accordance with the standard of the display panel 9 in the video interface 2, and the digital data Is supplied to the data processing unit 3.
[0027]
Needless to say, the video interface 2 does not need to perform A / D conversion when the input signal is supplied digitally. Further, when the synchronization signal is combined with the video signal, the synchronization signal input terminal 1b is not necessary.
[0028]
The data processing unit 3 includes a memory, performs various image quality adjustments, rearranges data corresponding to the arrangement of the address driver 7, rearranges data corresponding to the driving method, and supplies the data to the address driver 7. The drive control unit 4 generates various timing signals necessary for driving the display panel. The address driver 7 writes information to be displayed on the display panel 9 and causes the display panel 9 to emit light together with the X driver 8 and the Y driver.
[0029]
On the other hand, as the power supply system, the power input from the power input terminal 1 c is detected by the power detection unit 12. This detection result is notified to the MPU 5. Since the supply voltage is considered to be constant, it can be converted into the electric energy by detecting the amount of current, and this conversion may be performed by either the MPU 5 or the electric power detection unit 12. In the present invention, the method for detecting the power is not limited to this, and the power may be detected using a method other than the detection of the current amount.
[0030]
The internal power supply 13 converts the power input into a voltage required for the address driver 7, the X driver 8, and the Y driver 6. The power detection unit 14 detects sustain discharge (sustain) power, and the power detection unit 15 detects address power, and notifies the MPU 5 of the detection result.
[0031]
Here, the power obtained by multiplying the power supplied from the power input terminal 1c by the conversion efficiency in consideration of the voltage conversion efficiency in the internal power supply 13 is considered to be approximately the sum of the address power Padd and the sustain power Psus. This is because the power consumption in other circuits is considered to be sufficiently smaller than the address power Padd and the sustain power Psus.
[0032]
Therefore, if there are any two or more of the power detection units 12, 14, 15, the remaining power can be estimated from the two calculated values obtained. For example, if there are the power detection units 14 and 15, the power consumption Pset of the entire apparatus can be estimated from the sum of Psus and Padd, which are the detection results.
[0033]
Next, the display panel driving method in this embodiment will be described with reference to FIG.
[0034]
In the plasma display, one field is composed of a plurality of subfields (SF). The number of times of light emission (time) in the sustain discharge period of each subfield is weighted so that the relative ratio becomes, for example, 1: 2:... 2n−1 (n = number of subfields). During the address period, scanning is performed for each horizontal line according to the display data to generate a slight discharge, and wall charges are accumulated only in the cells that are desired to emit light. Repeat this operation for all lines. Next, during the sustain period, a sustain pulse is simultaneously applied to the display cells on the entire screen, and only the cells in which the wall charges are formed continue to discharge and emit light.
[0035]
If this operation is repeated as many times as the number of subfields, the light emission luminance of the panel is substantially proportional to the number of times (time) of light emission of the sustain discharge. For example, to display 256 gradations, one field can be composed of 8 subfields, and can be expressed by combining the presence or absence of light emission. From this, it is understood that the number of times of addressing increases as the number of subfields to be displayed increases, and the address power Padd required at that time also increases.
[0036]
Further, the contrast of the display image is controlled by controlling the number of pulses in the sustain light emission period. When the contrast is increased, the total number of light emission pulses increases, and the difference between light and dark can be expressed greatly. In this case, it can be easily estimated that the sustain power Psus is increased.
[0037]
Therefore, the address power Padd can be controlled by increasing / decreasing the number of subfields, and the sustain power Psus can be controlled by adjusting the contrast.
[0038]
Next, the operation and effect of the plasma display device in this embodiment will be described with reference to FIG.
[0039]
In the present embodiment, an allowable power capacity is obtained from the capacity of the display panel, the amount of heat generation, and the like, and the internal power supply 13 having a power capacity larger than that of the conventional one is used. Here, it is assumed that the power capacity is increased by Pi compared to the conventional case.
[0040]
In the graph shown in FIG. 3, the vertical axis represents the sustain power Psus caused by the sustain light emission current, and the horizontal axis represents the address power Padd caused by the address current in the address operation. In the graph of FIG. 3, a triangular area surrounded by the origin, Psx, and Pax is a conventional displayable area (see FIG. 9).
[0041]
Here, when the power supply capacity is increased with the aim of improving the contrast, if the control is performed focusing only on the power consumption of the entire apparatus as in the past, for example, depending on the pattern, type, etc. of the image displayed on the screen There is a possibility that the combination of the values of the sustain power Psus and the address power Padd moves to the region (O), and even if the sustain current flows excessively, there is no limit and the input power to the display panel becomes excessive.
[0042]
Therefore, in the region (A) or the region (O) where the sustain power Psus exceeds Psx, control is performed so as to reduce the number of light emission pulses by reducing the contrast. If this control is continued to enter the area (ii) or the conventional display area, normal display can be performed.
[0043]
On the other hand, since the address power Padd exceeds Pax in the area (E), control is performed so as to reduce the number of subfields. In FIG. 2, for example, if deletion is performed from the least significant bit, the address period and the light emission period in SF1 are eliminated. As a result, the number of addresses is reduced to 7/8, and the address power Padd can be suppressed.
[0044]
That is, in the present embodiment, the following operation is performed as power consumption control.
[0045]
(1) When the power of the entire apparatus exceeds a specified value, control is performed such that the contrast is lowered and the number of light emission pulses is reduced.
[0046]
(2) When the sustain power Psus exceeds Psx, control is performed so as to reduce the number of light emission pulses by reducing the contrast.
[0047]
(3) When the address power Padd exceeds Pax, control is performed to reduce the number of subfields.
[0048]
However, in the control of (3) above, the number of display bits is reduced by 1 bit, so the number of gradations is reduced. However, when the address power Padd exceeds Pax, the address driver 7 operates frequently, and the displayed pattern is not a pattern that changes gently over a wide area, but a fine pattern that changes slightly. it is conceivable that. In such a pattern, the lack of gradation is not noticeable and the display image quality is unlikely to deteriorate.
[0049]
Further, in the present embodiment, no limitation is made in the area (i).
[0050]
According to the above control, it is possible to drive the address power Padd and the sustain power Psus into the conventional displayable area and area (i).
[0051]
Furthermore, according to the control described above, it is possible to express with high brightness in the area (i) compared to the conventional method, the image quality is improved, and the power consumption can be suppressed to the specified value.
[0052]
Next, another embodiment of the plasma display device to which the present invention is applied will be described with reference to FIG. In FIG. 4, blocks and terminals having the same functions as those in FIG. Hereinafter, a configuration different from the above embodiment will be described in detail.
[0053]
In the apparatus according to the present embodiment, the data processing unit is provided with a function of acting on the power detection unit 15 in the configuration of the embodiment of FIG. The data processing unit 3 ′ of the present embodiment detects the amount of change in the data supplied to the address driver 7, thereby determining in advance the state of the video to be displayed next, and the power consumption in the address driver 7. It has a function to detect. Therefore, the power detection unit 15 for detecting the power consumption of the address driver 7 in the above embodiment is not necessary here.
[0054]
A configuration example of the data processing unit 3 ′ of the present embodiment will be described in detail with reference to FIG. In FIG. 5, blocks and terminals having the same functions as those in FIG.
[0055]
The data processing unit 3 ′ in this example includes a data processor 31, a power detection unit 32, a frame memory 33, and a memory controller 34.
[0056]
Video data input from the video interface 2 is rearranged into data for image processing and driving of the address driver 7 by the data processor 31. The memory controller 34 generates a write control signal for the frame memory 33 from the clock and synchronization signal input from the video interface 2.
[0057]
The power detection unit 32 is arranged between the data processor 31 and the write port of the frame memory 33, calculates the amount of change of video data for a certain time, and further calculates the power consumption in the address driver 7 based on the amount of change. Then, the MPU 5 is notified of the calculation result. Data in the frame memory 33 is read in synchronization with the timing signal from the driver control unit 4 and supplied to the address driver 7.
[0058]
Note that the power detection unit 32 does not necessarily need to obtain the address power by calculation. For example, a configuration may be adopted in which CMOS buffers are inserted as many as the number of data lines and the power consumption is measured. In this case, since most of the power consumption of the CMOS device occurs when the data changes, the integrated value of the number of times the data changes is estimated by measuring the power consumption (current consumption). Power consumption can be calculated.
[0059]
Next, another embodiment of the plasma display device according to the present invention will be described with reference to FIG.
[0060]
The apparatus of the present embodiment has the same configuration as the plasma display apparatus of the embodiment of FIG. 4 except for the configuration of the MPU. In FIG. 6, blocks and terminals having the same functions as those in FIG. Hereinafter, a configuration different from the embodiment of FIG. 4 will be described in detail.
[0061]
The MPU 5 ′ of the present embodiment compares each of the data output from the power detection units 12 and 14 with a predetermined value set in advance corresponding to each, and selects the one having the larger difference 16. Here, as the specified value, for example, a maximum allowable power predetermined for power consumption and sustain power of the entire apparatus or a value less than that is used.
[0062]
Further, the MPU 5 ′ obtains a difference between the address power Padd detected by the data processing unit 3 ′ and a predetermined value corresponding thereto, and uses the difference and the selection result by the detection selection unit 16, A control command for controlling power consumption is output.
[0063]
In this embodiment, the MPU 5 ′ obtains the difference between the address power Padd and the specified value. However, the data processor 3 ′ may obtain the difference and send the result to the MPU 5 ′. In the present embodiment, the detection selection unit 16 is included in the MPU 5 '. However, the detection selection unit 16 may be realized by hardware separately from the MPU 5'. In the present embodiment, the data processing unit 3 ′ detects the address power Padd. For example, the MPU 5 ′ calculates the address power Padd using the detection results Pset and Psus of the power detection units 12 and 14. It is good also as a structure calculated | required.
[0064]
Next, the power consumption control procedure in the apparatus of the present embodiment will be described in more detail with reference to FIGS.
[0065]
First, the case where the relationship between the address power Padd and the sustain power Psus is located in (a) according to the display pattern, its type, etc. in FIG. 7 will be described with reference to the flowcharts in FIGS.
[0066]
At the position (a), the address power Padd does not exceed the specified value Pax, and there is no need for restriction. On the other hand, it is assumed that the sustain power Psus exceeds Psx by ds1, and the sustain power Psus + address power Padd also exceeds the specified power consumption value of the entire apparatus by dt1.
[0067]
Here, dt is a difference between the detection value Pset of the power consumption of the entire apparatus detected by the power detection unit 12 and a specified value corresponding to, for example, the allowable power consumption of the entire apparatus. Ds is a difference between the sustain power Psus detected by the power detection unit 14 and the specified value Psx. Further, da is a difference between the address power Padd detected by the data processing unit 3 ′ and the specified value Pax. Here, dt, ds, and da are set to be negative values when the detected power is less than a specified value.
[0068]
In the control procedure of the present embodiment, the difference dt related to the power consumption of the entire apparatus is compared with the difference ds related to the sustain power (step 1010), and the power component corresponding to the larger value is equal to or less than the specified value. The contrast is adjusted (steps 1011 to 1014).
[0069]
Note that n in the flowchart represents a step width when controlling the contrast. Here, the larger the total number of sustaining light pulses, the darker the screen, and the darker the contrast, and the contrast is the difference between each gradation. Therefore, the contrast becomes larger when the total number of light emission sustaining pulses is larger, and darker when the total number is smaller. In this example, the contrast is determined by a plurality of combinations of the number of pulses to be assigned to each subfield (a combination to be assigned to each subfield from the total number of pulses), and the step width n indicates how many of these combinations are skipped. .
[0070]
In this example, the detection selection unit 16 selects the larger data, that is, ds1 (Yes in Step 1010), and sends a command to lower the contrast from the MPU 5 ′ to the drive control unit 4 (Step 1011). This control is repeated until the sustain power Psus becomes smaller than Pax (step 1012).
[0071]
Even in the case of (b), the control procedure according to the flowchart of FIG. 10 can be applied as in the case (b).
[0072]
That is, at the position (b), the address power Padd does not exceed Pax and there is no need for restriction. On the other hand, it is assumed that the sustain power Psus exceeds Psx by ds2, and the sustain power Psus + address power Padd also exceeds the specified power consumption of the entire set by dt2.
[0073]
In this case, the detection selection unit 16 selects the larger data, that is, dt2 (No in step 1010), and sends a command to lower the contrast from the MPU 5 'to the drive control unit 4 as in the case of (A) ( Step 1013) is repeated until the power consumption of the entire apparatus becomes smaller than the specified value (step 1014).
[0074]
Next, the case where the combination of the address power and the sustain power is located in (c) of FIG. 7 will be described. The control method here is to switch according to parameters that are important in the display image.
[0075]
First, a control method when the number of bits to be displayed is emphasized will be described.
[0076]
In the position (c), the sustain power Psus does not exceed Psx, and there is no need for restriction. However, the address power Padd exceeds Pax. Therefore, as in the control procedure shown in the flowchart of FIG. 11, an instruction to reduce the number of display subfields is sent from the MPU 5 ′ to the drive control unit 4 (step 1110), and the address is changed until the address power Padd becomes less than Pax. Control is performed to reduce the power Padd (step 1111). Under the control of steps 1110 to 1111, as indicated by (1) in FIG. 7, the combination position of the address power and the sustain power in the figure moves.
[0077]
Further, it is determined whether the power consumption of the entire device (sustain power Psus + address power Padd) exceeds the specified value (step 1112), and if it exceeds the specified value as in this example (Yes in step 1112) Sends a command to lower the contrast from the MPU 5 ′ to the drive control unit 4 (step 1113), and continues the control until the sustain power Psus + address power Padd becomes a specified value of the power consumption of the entire apparatus. Under the control of steps 1112 to 1113, as indicated by (2) in FIG. 7, the combination position of the address power and the sustain power in the figure moves.
[0078]
According to the control procedure as shown in FIG. 11, it is possible to perform display while maintaining the number of display bits as much as possible.
[0079]
Further, when importance is attached to luminance, the control procedure shown in the flowchart of FIG. 12 is executed.
[0080]
That is, even after the control in steps 1210 to 1211 which is the same procedure as steps 1110 to 1111 in FIG. 11 is performed, a command to reduce the number of display subfields is sent until the power consumption Pset of the entire apparatus falls below a specified value ( Steps 1213 to 1214), address power Padd is lowered. Here, as indicated by (1) in FIG. 7 by the control of steps 1210 to 1211 and as indicated by (3) of FIG. 7 by the control of steps 1212 to 1213, the address power and the sustain power in the figure are shown. The combination position moves.
[0081]
In addition, the control of the power consumption of the entire apparatus implemented by lowering the contrast from the control of the address power implemented by reducing the number of subfields (steps 1110 to 1111 in FIG. 11 or steps 1210 to 1211 in FIG. 12) ( Whether to move to Steps 1112 to 1113) or to control the power consumption of the entire apparatus (Steps 1212 to 1213) performed by reducing the number of subfields may be switched according to the value of the sustain power Psus.
[0082]
For example, when the video to be displayed is dark, the control of Steps 1112 to 1113 that emphasizes the number of display bits is performed, and when the video is bright, the control of Steps 1212 to 1213 that emphasizes the luminance may be performed.
[0083]
The information of the power detection unit 16 is sent from the MPU 5 ′ to the drive control unit 4. However, the power detection unit 16 is provided independently and supplied directly to the drive control unit 4 without going through the MPU 5 ′. It is good also as a simple structure. According to such a configuration, there is an advantage that the load on the MPU 5 ′ is reduced.
[0084]
【The invention's effect】
According to the present invention, the power consumption of the entire device, the power consumption of the address driver and the sustain power for sustain discharge are detected, and the number of sustain pulses and the number of display bits are controlled to thereby control the address driver with excessive power supply. It is possible to provide a plasma display apparatus and a control method that can control power consumption while preventing damage to the display panel and the display panel.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a plasma display device of the present invention.
FIG. 2 is an explanatory diagram of a driving method of a conventional plasma display device.
FIG. 3 is an explanatory diagram of a power consumption control method of the plasma display device of the present invention.
FIG. 4 is a block diagram showing another embodiment of the plasma display device of the present invention.
FIG. 5 is a block diagram illustrating a configuration example of a data processing unit in the embodiment of FIG. 4;
FIG. 6 is a block diagram showing another embodiment of the plasma display device of the present invention.
FIG. 7 is an explanatory diagram of a power consumption control method in another embodiment of the plasma display device of the present invention.
FIG. 8 is a block diagram showing an example of a conventional plasma display device.
FIG. 9 is an explanatory diagram illustrating a conventional power consumption control method.
10 is a flowchart showing an example of a power control procedure in the embodiment of FIG.
FIG. 11 is a flowchart showing another example of the power control procedure in the embodiment of FIG. 7;
12 is a flowchart showing another example of the power control procedure in the embodiment of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Plasma display apparatus, 2 ... Video interface, 3 ... Data processing part, 4 ... Drive control part, 5 ... MPU, 6 ... Y driver, 7 ... Address driver, 8 ... X driver, 9 ... Display panel, 12 ... Electric power Detection unit, 13 ... internal power supply, 14 ... power detection unit, 15 ... power detection unit, 16 ... detection selection unit, 31 ... data processor, 32 ... power detection unit, 33 ... frame memory, 34 ... memory controller.

Claims (6)

A plasma display panel for displaying images;
An address driver for writing information to be displayed on the plasma display panel;
Panel drive pulse generating means for providing a pulse for driving the plasma display panel;
Drive control means for controlling the panel drive pulse generating means and the address driver;
Control means for controlling the entire plasma display device;
An internal power source that accepts an external power input and converts it into a voltage to be supplied to the address driver and the panel drive pulse generating means, and a plasma display device comprising:
The sustain power value corresponding to the power consumed by the sustain light emission operation in the plasma display panel, the address power value corresponding to the power consumed by the address operation, and the sum of the sustain power value and the address power value Power value acquisition means for detecting
The control means performs control to reduce the number of sustain light emission pulses when the sustain power value acquired by the power value acquisition means exceeds a specified value of sustain power, and the address power value is set to a specified value of address power. If it exceeds, perform control to reduce the number of subfields to be displayed,
The address power value is less than a specified value of the address power, and the sum of the sustain power value and the address power value is a value greater than the specified value of the sustain power. If exceeded, the sustain light emission pulse is set so that the sum of the sustain power value and the address power value is less than or equal to a specified value of the power of the entire plasma display apparatus, and the sustain power value is less than or equal to the specified value of the sustain power. Reduce the number,
When the address power value exceeds a specified value of the address power, and the sum of the sustain power value and the address power value exceeds a specified value of the power of the entire plasma display device, the address power value is the address power. the specified value to reduce the number of subfields to be equal to or less than, then, in response to said sustain power value, by switching the control to reduce the number of subfields to be displayed and controlled to reduce the sustain light emission pulse number, the The plasma display apparatus , wherein the drive control means is controlled so that a sum of a sustain power value and the address power value is equal to or less than a specified value of the power of the entire plasma display apparatus. The plasma display device according to claim 1,
The power value acquisition means includes
Address power detection means for obtaining the address power value by detecting power consumed by the address driver;
Sustain power detection means for obtaining the sustain power by detecting a power value consumed by the panel drive pulse generation means and the plasma display panel;
Based on the address power value detected by the address power detection means and the sustain power value detected by the sustain power detection means, the sum of the sustain power value and the address power value is obtained as the power of the entire plasma display device. Means to
A plasma display device comprising: The plasma display device according to claim 2, wherein
The plasma display apparatus characterized in that the address power detection means detects address power accompanying an address operation when displaying in the next frame from data supplied to the address driver. The plasma display device according to claim 1,
The sum of the acquired sustain power value and the address power value and the sustain power value are respectively compared with a predetermined value corresponding to each, and an excess of the acquired value with respect to the specified value The plasma display apparatus further comprises selection means for selecting the larger one and supplying the selected one to the control means . The plasma display device according to claim 4 , wherein
The plasma display device is
A plurality of subfields having different sustain light emission periods constitute one frame to display a multi-gradation video signal, and the control means outputs the output value according to the output value from the selection means. A plasma display device characterized in that control is performed so that the number of sustain light emission pulses continues to decrease until it becomes smaller than a corresponding specified value . In a control method of a plasma display device for displaying a multi-gradation video signal by constituting one frame with a plurality of subfields having different sustain light emission periods ,
Obtain the sustain power value corresponding to the power consumed by the sustain light emission operation,
Get the address power value corresponding to the power consumed by the address operation,
When the sustain power value is greater than a specified value of the sustain power, control is performed to reduce the number of sustain light emission pulses so that the sustain power is smaller than the specified value,
When the address power value is larger than a specified value of the address power, control is performed to reduce the number of subfields to be displayed so that the address power is smaller than the specified value.
The address power value is less than a specified value of the address power, and the sum of the sustain power value and the address power value is a value greater than the specified value of the sustain power. The sustain power value so that the sum of the sustain power value and the address power value is less than or equal to a specified value of the power of the entire plasma display apparatus, and the sustain power value is less than or equal to the specified value of the sustain power. Reduce the number of pulses,
When the address power value exceeds a specified value of the address power, and the sum of the sustain power value and the address power value exceeds a specified value of the power of the entire plasma display device, the address power value is the address power. The number of subfields is decreased so as to be equal to or less than a specified value of the current, and then the sum of the sustain power value and the address power value is determined according to the sustain power value so as to be equal to or less than the specified value of the power of the entire plasma display apparatus. A control method for a plasma display device , wherein the control for reducing the number of sustain light emission pulses and the control for reducing the number of subfields to be displayed are switched .

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