KR20060109651A - Plasma display device and control method thereof - Google Patents

Abstract

A plasma display device and a control method thereof are provided to perform address discharge even at low temperature by changing the lowest limit value of an image signal gain according to the temperature of a plasma display panel. A plasma display device includes a plasma display panel(100) having plural address, scan, and sustain electrodes(A1~Am,Y1~Yn,X1~Xn); a temperature sensing unit(600) detecting and outputting the temperature of the plasma display panel; a control unit(200) for deciding an automatic power control level by receiving an external image signal and calculating a load factor, selecting a lookup table corresponding to the temperature output from the temperature sensing unit, and then generating and outputting sub field data by multiplying the image signal by a gain value corresponding to the automatic power control level in the selected lookup table; and an address data driving unit applying voltage corresponding to the sub field data to the address electrode.

Description

Plasma display device and control method thereof

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

FIG. 2 is a detailed configuration diagram of the control unit of FIG. 1.

3A to 3C are diagrams showing gain values corresponding to APC levels for respective temperatures.

4 is a diagram illustrating a lower limit of a gain value corresponding to temperature.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP) and, more particularly, to a control method of a plasma display device for stabilizing address discharge.

A plasma display panel is a flat display device that displays characters or images by using plasma generated by gas discharge, and tens to millions or more of pixels are arranged in a matrix form according to their size.

In order for a plasma display panel to perform as a color display, it is necessary to implement halftones. Currently, a halftone implementation method of dividing one TV field into a plurality of subfields and controlling the time division is used. have.

Such a plasma display device has a long discharge delay when the temperature drops to a low temperature, and thus, an address discharge becomes poor.

Meanwhile, in order to reduce power consumption in the plasma display device, the number of switching of the address data is reduced by multiplying the gain by the image signal according to the load ratio.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve a conventional problem, and to provide a plasma display device and a method of controlling the same so that address discharge occurs smoothly even at low temperatures by sensing the temperature of the plasma display panel.

A plasma display device according to an aspect of the present invention for solving this problem,

A plasma display panel including a plurality of address electrodes, a plurality of scan electrodes, and a sustain electrode;

A temperature sensor configured to detect and output a temperature of the plasma display panel;

Automatic power control level is determined by receiving an external image signal, calculating a load ratio, selecting a lookup table corresponding to the temperature output from the temperature sensing unit, and then gain values corresponding to the automatic power control level in the selected lookup table. A control unit for generating and outputting subfield data by multiplying the video signal by a signal;

And an address data driver for applying a voltage corresponding to the subfield data to the address electrode.

The control unit,

An average signal level calculator for calculating a load ratio of the video signal;

An automatic power control unit for determining and outputting an automatic power control level from the load ratio;

A memory for storing a plurality of lookup tables corresponding to temperatures;

A gain controller that reads a gain value corresponding to the automatic power control level from a lockup table corresponding to a temperature output from the temperature sensor, and multiplies the video signal to output corrected data;

And a subfield data generator for generating subfield data from the corrected data output from the gain controller.

The control method of the plasma display device according to another aspect of the present invention for achieving the technical problem,

A control method of a plasma display device including a plurality of lookup tables having different lower limit gain values corresponding to an automatic power control level,

Sensing a temperature of the plasma display panel;

Calculating a load ratio of the image signal and determining an automatic power control level corresponding to the load ratio;

Selecting a lookup table corresponding to the sensed temperature and outputting corrected data by multiplying a gain value corresponding to the automatic power control level by an externally input image signal in the selected lookup table;

Generating and outputting the corrected data as subfield data.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

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

Referring to FIG. 1, a plasma display device according to an exemplary embodiment of the present invention may include a temperature sensor 600, a plasma display panel 100, a controller 200, an address electrode driver 300, and a scan electrode driver ( And a sustain electrode driver (hereinafter, referred to as an 'X electrode driver') 500.

The plasma display panel 100 includes a plurality of address electrodes A1-Am arranged in a column direction, a plurality of sustain electrodes (hereinafter referred to as 'X electrodes') (X1-Xn) and scans arranged in a row direction. Electrodes (hereinafter referred to as 'Y electrodes') Y1-Yn. The X electrodes X1 to Xn are formed corresponding to the respective Y electrodes Y1 to Yn, and generally have one end connected to each other in common. The plasma display panel 100 includes a glass substrate (not shown) in which the X and Y electrodes X1-Xn and Y1-Yn are arranged, and a glass substrate (not shown) in which the address electrodes A1-Am are arranged. Is done. The two glass substrates are disposed to face each other with the discharge space therebetween so that the Y electrodes Y1-Yn and the address electrodes A1-Am and the X electrodes X1-Xn and the address electrodes A1-Am are orthogonal to each other. At this time, the discharge space at the intersection of the address electrodes A1-Am and the X and Y electrodes X1-Xn and Y1-Yn forms a discharge cell. The temperature detector 600 detects and outputs a temperature of the plasma display panel 100 or a temperature around the plasma display panel 100. The controller 200 receives the image data and outputs an address driving signal, an X electrode driving signal and a Y electrode driving signal, and receives the image signal to generate subfield data and output the subfield data as an address electrode driving signal. In this case, the controller 200 selects a lookup table corresponding to the sensed temperature, reads a gain value corresponding to the automatic power control level from the selected lookup table, multiplies the image signal, and corrects the subfield data with the corrected data. Create The address electrode driver 300 receives an address electrode driving signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1-Am. The X electrode driver 500 receives an X electrode driving signal from the controller 200 and applies a driving voltage to the X electrodes X1 to Xn. The Y electrode driver 400 receives the Y electrode driving signal from the controller 200 and applies a voltage corresponding to the Y electrode driving signal to the Y electrodes Y1-Yn.

2 is a detailed view of the control unit 200.

Referring to FIG. 2, the controller 200 includes a first memory 210, a gain controller 220, a subfield data generator 230, an average signal level calculator 240, an automatic power controller 250, and a first memory 210. Two memories 260.

The first memory 210 stores a plurality of lookup tables corresponding to a temperature, and each lookup table stores a gain value according to the automatic power control level, and as the temperature increases, the lower limit of the gain value increases and the gain value It is decided in the range of 1 aha. The gain controller 220 selects a lookup table corresponding to the temperature output from the temperature sensing unit 600, and reads a gain value corresponding to the automatic power control level determined by the automatic power control unit 250 from the selected lookup table. The data corrected by multiplying the video signal is output. The subfield data generator 230 receives corrected data output from the gain controller 220 and generates an address electrode driving signal in the form of subfield data. The average signal level calculator 240 calculates and outputs a load ratio of the video signal. The second memory 260 stores the number of sustain pulses corresponding to the automatic power control level. The automatic power controller 250 determines the automatic power control level according to the load ratio, reads the number of sustain pulses corresponding to the automatic power control level from the second memory, and generates and outputs an X electrode driving signal and a Y electrode driving signal. do.

Next, the operation of the plasma display panel according to the embodiment of the present invention having such a configuration will be described in detail.

First, when power is applied, the temperature detector 600 detects a temperature of the plasma display panel 300 and outputs the temperature to the gain controller 220.

Meanwhile, the average signal level calculator 250 of the controller 200 receives an image signal input from the outside and calculates and outputs an average signal level, that is, a load ratio. Here, the average signal level is used as one of the methods for measuring the load ratio. Then, the automatic power control unit 250 determines the automatic power control level from the load ratio, outputs it to the gain controller 220, and reads the number of sustain pulses corresponding to the automatic power control level from the second memory 260 to obtain X. The electrode driving signal and the Y electrode driving signal are generated and output.

Then, the gain controller 220 of the control unit 200 selects a lookup table corresponding to the sensed temperature from the first memory 210, reads a gain corresponding to the automatic power control level from the selected lookup table, and inputs it externally. The corrected data is generated by multiplying the video signal. Here, an example of a lookup table corresponding to a temperature stored in the first memory 210 is illustrated in FIGS. 3A to 3C. In fact, a plurality of such lookup tables exist.

Referring to FIG. 3A, in the case of 30 degrees Celsius, a plurality of gains corresponding to 0.99 to 0.20 are applied to an automatic power control level step of 1 to 256 levels. The gain value decreases as the load factor increases, that is, as the automatic power control level increases. This reduces power consumption by multiplying the video data by a low gain at high load rates. In other words, the higher the load factor, the lower the gain to deform the image data more, and the lower the load ratio, the higher the gain to deform the image data less.

3B is a diagram showing a gain corresponding to the automatic power control level at 5 degrees Celsius.

Referring to FIG. 3B, since address discharge does not occur at 5 degrees Celsius compared to 30 degrees Celsius, the automatic power control level is 0,50 without lowering the gain after step 128 and lower limit. Thus, address discharge can occur smoothly.

3C is a diagram showing a gain corresponding to the automatic power control level at 0 degrees Celsius.

Referring to FIG. 3C, since the address discharge does not occur more smoothly at 0 degrees Celsius than at 30 degrees Celsius, compared to 5 degrees Celsius, the automatic power control level is 0, 98 without lowering the gain after step 2. Thus, address discharge can occur more smoothly.

As the temperature is lowered, the lower limit of the gain value gradually increases, and the relationship between the lower limit of the gain value and the temperature is illustrated in FIG. 4.

Referring to FIG. 4, as the temperature increases, the lower limit of the gain decreases in inverse proportion to the second order curve. The lower limit may be variously modified as necessary, and may be variously modified in a temperature range. The lower limit may be set as a temperature range that can be actually detected by the plasma display panel, and in particular, may be variously modified according to the surrounding environment.

Next, the subfield data generator 230 generates image data corrected by the gain controller 220 as a predetermined number of subfield data and outputs the subfield data to the address electrode driver 300.

Then, the address electrode driver 300 receives the address electrode drive signal and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1-Am, and the X electrode driver 500 receives the X electrode. The driving signal is received to apply the driving voltage to the X electrodes X1 to Xn, and the Y electrode driving unit 400 receives the Y electrode driving signal to apply the driving voltage to the Y electrodes Y1 to Yn.

Then, data is displayed on the plasma panel 100.

According to the exemplary embodiment of the present invention, the gain is multiplied by the image signal according to the temperature of the plasma display panel. As the temperature increases, the gain value of the look-up table having a high lower limit is multiplied to facilitate address discharge.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the exemplary embodiment of the present invention, a plasma display device and a method of controlling the same may be provided so that address discharge can be performed smoothly even at low temperatures by varying the lower limit of the gain of the video signal according to the temperature of the plasma display panel. have.

Claims (5)

A plasma display panel including a plurality of address electrodes, a plurality of scan electrodes, and a sustain electrode; A temperature sensor configured to detect and output a temperature of the plasma display panel; Automatic power control level is determined by receiving an external image signal, calculating a load ratio, selecting a lookup table corresponding to the temperature output from the temperature sensing unit, and then gain values corresponding to the automatic power control level in the selected lookup table. A control unit for generating and outputting subfield data by multiplying the video signal; And an address data driver configured to apply a voltage corresponding to the subfield data to the address electrode. The method of claim 1, The control unit, An average signal level calculator for calculating a load ratio of the video signal; An automatic power control unit for determining and outputting an automatic power control level from the load ratio; A memory for storing a plurality of lookup tables corresponding to temperatures; A gain controller that reads a gain value corresponding to the automatic power control level from a lockup table corresponding to a temperature output from the temperature sensor, and multiplies the video signal to output corrected data; And a subfield data generator configured to generate subfield data from the corrected data output from the gain controller. The method of claim 2, Each lookup table stores a gain value corresponding to an automatic power control level, and the lower the temperature, the lower the lower limit of the gain value of the lookup table. A control method of a plasma display device including a plurality of lookup tables having different lower limit gain values corresponding to an automatic power control level, Sensing a temperature of the plasma display panel; Calculating a load ratio of the image signal and determining an automatic power control level corresponding to the load ratio; Selecting a lookup table corresponding to the sensed temperature and outputting corrected data by multiplying a gain value corresponding to the automatic power control level by an externally input image signal in the selected lookup table; And generating and outputting the corrected data as subfield data. The method of claim 4, wherein And the lower the temperature, the lower the lower limit of the gain value for the automatic power control level.

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