KR100726665B1 - Plasma Display Apparatus - Google Patents

Abstract

The present invention relates to a plasma display device, and more particularly, to a plasma display device capable of reducing noise generated on a screen during driving.

In accordance with another aspect of the present invention, a plasma display apparatus includes a video scan convertor (VSC) unit for converting an image signal input from an external device into a signal for driving a plasma display panel; A driver to drive the plasma display panel using the converted signal; And a voltage supply unit supplying the voltage converted from the voltage input from the outside into different transformers to the VSC unit and the driving unit, respectively.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 is a structure schematically showing the structure of a conventional plasma display device.

2 is a diagram schematically illustrating a rear structure of a frame in a conventional plasma display device.

3 is a view showing an image implemented in a conventional plasma display panel.

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

5 is a view for explaining a voltage supply unit according to an embodiment of the present invention.

6 is a view for explaining a voltage supply unit according to another exemplary embodiment of the present invention.

7 illustrates an image implemented in a plasma display panel according to an embodiment of the present invention.

***** Explanation of symbols for main parts of drawing *****

410, 520, 620; VSC section 420, 530, 630; Driving part

430, 510, 610; Voltage supply 440; Plasma display panel

511, 611; Filters 512, 612; rectifier

513, 613; PFC 514, 614; First transformer

515; Second transformers 516, 616; Third transformer

517, 617; Fourth transformer 518, 618; Fifth transformer

The present invention relates to a plasma display device, and more particularly, to a plasma display device capable of reducing noise generated on a screen during driving.

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

1 is a structure schematically showing the structure of a conventional plasma display device. As shown in the drawing, the plasma display device excites a phosphor by a case 110 including a front cabinet 111 and a back cover 112 that determine an appearance, and vacuum ultraviolet rays caused by gas discharge inside the case. A plasma display panel 120 that implements an image, a driving device 130 including a PCB for driving and controlling the plasma display panel, and connected to the driving device to emit heat generated when the plasma display device is driven, And a frame 140 for supporting the plasma display panel.

In addition, the filter 150 and the filter 150 formed by attaching a film to a transparent glass substrate (not shown) with a predetermined distance to the front surface of the plasma display panel are supported and electrically connected to the metal back cover. Finger spring gasket (Finger Spring Gasket) 160 and Filter Supporter (Filter Supporter, 170) for connecting, and a module supporter (Module Supporter, 180) for supporting the PDP including the drive device.

In the fabrication process of the conventional plasma display device having such a structure, first, a plasma display panel that implements the image is manufactured, and then a frame and a driving device, etc., which are installed on the rear surface of the plasma display panel are assembled to form a module of the plasma display panel. To make. Subsequently, a case 110 for determining the appearance of the plasma display panel module is formed to manufacture a plasma display device as a finished product.

1 is a structure schematically showing the structure of a conventional plasma display device.

As shown in FIG. 1, the plasma display apparatus includes a case 110 including a front cabinet 111 and a back cover 112 that determine an appearance, and a phosphor by vacuum ultraviolet rays caused by gas discharge inside the case. And a plasma display panel 120 to excite the image. In addition, a driving board 130 for driving and controlling the plasma display panel 120 and supplying a voltage to each other, that is, a driving unit and a voltage supplying unit is formed on a printed circuit board, and the plasma display panel 120. And a frame 140 supporting the driving board 130 and dissipating heat generated during driving.

In addition, a filter 150 formed by attaching a film to a transparent glass substrate (not shown) with a predetermined distance to the front surface of the plasma display panel 120 and a metal at the same time while supporting the filter 150 A finger spring gasket (160) and a filter support (170) electrically connected to the back cover (160), and a plasma display panel including the plasma display panel (120) and a driving board (130). A module supporter (180) for supporting the module of the module, and the VSC (Video Scan Convertor, 190) formed on the back cover 112, and receives a video signal from the outside.

 In the manufacturing process of the conventional plasma display apparatus having such a structure, first, a plasma display panel that implements the image is manufactured, and then a frame and a driving board installed on the rear surface of the plasma display panel are assembled to form a module of the plasma display panel. To make. Thereafter, a case 110 for determining the appearance of the plasma display panel is formed to manufacture a plasma display device as a finished product.

2 is a diagram schematically illustrating a rear structure of a frame in a conventional plasma display device.

As shown in FIG. 2, a supporter bracket 210 and a driving board 230, 240, 250, 260, and 270 are provided on a rear surface of the conventional frame 200.

The supporter bracket 210 strengthens the mechanical horizontal strength of the frame 200 and supports the driving boards 230, 240, 250, 260, and 270 formed on the frame 200. Here, a mounter 220 for fastening the frame 200 and the back cover (not shown) is attached to the supporter bracket 210.

 In the driving boards 230, 240, 250, 260, and 270, a driving circuit for realizing an image is formed by applying a voltage to each electrode formed in the plasma display panel (not shown). The driving board includes a driving unit including a scan electrode driving unit 230, a sustain electrode driving unit 240, an address electrode driving unit 250, and a driving pulse control unit 260, and a voltage supply unit 270 that supplies a voltage to the driving unit. That is, the scan electrode driver 230 for applying a voltage to the scan electrode (not shown) formed in the plasma display panel, the sustain electrode driver 240 for applying a voltage to the sustain electrode (not shown) formed in the plasma display panel, An address electrode driver 250 for applying a voltage to an address electrode (not shown) formed in the plasma display panel, a drive pulse controller 260 for controlling each of the electrode drivers 230, 240, and 250, and each electrode driver And a voltage supply unit 270 for supplying voltage to the driving pulse controller 260. Here, each electrode driver 230, 240, 250 is electrically connected to each electrode of the plasma display panel through a flexible printing film (not shown).

Meanwhile, the conventional voltage supply unit includes a plurality of transformers to supply a voltage required for the plasma display device. Here, the voltage supply unit divides and supplies a large voltage applied to each electrode of the plasma display panel and a small voltage for driving each functional unit. An image implemented as shown in FIG. Noise is generated in.

3 is a view showing an image implemented in a conventional plasma display panel.

As shown in FIG. 3, the conventional plasma display apparatus generates noise in an image implemented during driving. This is because the conventional voltage supply unit supplies a small voltage of the driving unit and the VSC unit using one small voltage transformer. That is, since a large voltage driving pulse applied from the driver affects an image signal or a logic signal of a low voltage of the VSC unit, noise appears in an image to be implemented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display apparatus which can suppress noise of an image implemented by improving the plasma display apparatus.

Another object of the present invention is to provide a plasma display device capable of stably supplying voltage to each functional unit by improving the plasma display device.

In order to achieve the above object, the plasma display device of the present invention includes a video scan convertor (VSC) unit for converting an image signal input from the outside into a signal for driving the plasma display panel; A driver to drive the plasma display panel using the converted signal; And a voltage supply unit supplying the voltage converted from the voltage input from the outside into different transformers to the VSC unit and the driving unit, respectively.

The voltage supplied to the driver is characterized in that the logic voltage of the driver.

The logic voltage may be supplied from a standby transformer which converts into a standby voltage.

The voltage supplied to the VSC unit may be any one of a logic voltage or an analog signal voltage of the VSC unit.

The voltage supply unit supplies a voltage of at least one voltage level to the VSC unit using one transformer.

The logic voltage is characterized in that more than 3V 30V or less.

The voltage supply unit may further include a transformer that converts the voltage applied to the plasma display panel.

The transformer of the VSC unit and the driving unit may be connected to different ground terminals, respectively.

Hereinafter, with reference to the accompanying drawings, a specific embodiment according to the present invention will be described.

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

As shown in FIG. 4, the plasma display apparatus according to an exemplary embodiment of the present invention includes a VSC unit 410, a driver 420, a voltage supply unit 430, and a plasma display panel 440. .

The VSC unit 410 converts an image signal input from the outside into a signal suitable for driving the plasma display panel 440. That is, the image signal having an arbitrary resolution input from the outside is converted into a resolution suitable for the plasma display device. In addition, an external image signal, which is an analog signal, is converted into a digital signal for driving the plasma display device. To this end, the VSC unit includes a scaler (not shown), an A / D converter (not shown), and a video decoder (not shown). As described above, the analog signal and the digital signal are mixed in the VSC unit 410, and a logic voltage having various voltage levels is required to perform each function.

The driver 420 drives the plasma display panel 440 by using the signal converted from the VSC unit 410. To this end, the driver 420 includes a scan electrode driver, a sustain electrode driver, an address electrode driver, and a driving pulse controller. That is, the scan electrode driver for applying a voltage to the scan electrode formed on the plasma display panel 440, the sustain electrode driver for applying a voltage to the sustain electrode formed on the plasma display panel 440, and the plasma display panel 440. An address electrode driver for applying a voltage to the formed address electrode and a driving pulse controller for controlling each electrode driver form a driver 420 for driving the plasma display panel 440. The driving unit 420 needs a voltage for applying to each electrode of the plasma display panel 440, that is, a large voltage (approximately 80V to 250V). In addition, the driver 420 requires a logic voltage, that is, a small voltage (approximately 5V), for driving each functional unit.

The voltage supply unit 430 converts the voltage input from the outside into a voltage level required by the above-described VSC unit 410 and the driver 420 and supplies the voltage. In one embodiment of the present invention, unlike the conventional voltage supply to the VSC unit 410 and the driving unit 420 by using a single small voltage transformer, the voltage is converted to different transformers respectively.

This is because when the small voltages of the VSC unit 410 and the driving unit 420 are converted into one small voltage transformer and supplied, the driving pulses generated by the large voltage supplied from the high voltage transformer to the driving unit 420 are affected. to be. That is, when a large voltage driving pulse, such as a sustain pulse, is applied to the plasma display panel, a small component electrically connected to the circuit of the driving unit 420 due to electromagnetic interference (EMI) generated by the peaking component. This affects the voltage transformer. As the voltage supplied from the small voltage transformer is supplied to the VSC unit 420, noise is generated in an externally input image signal having a small potential difference of about 800 mV. The VSC unit 410 recognizes noise as an image signal and is implemented as an image on the plasma display panel 440.

Therefore, in the exemplary embodiment of the present invention, a transformer for converting the voltage to the voltage supplied to the VSC unit 410 and a transformer for converting the voltage to the voltage supplied to the driving unit 420 are provided to convert each other. At this time, each transformer is connected to a different ground terminal. For example, in FIG. 5, the first transformer 431 is for supplying a logic voltage or an analog signal voltage supplied to the VSC unit 410, and the second transformer 432 is for supplying a logic voltage supplied to the driving unit 420. It is to supply. The third transformer 433 is for supplying a large voltage applied to each electrode of the plasma display panel 440 through the driver 420. Here, the voltage applied to each electrode is preferably provided with a plurality of third transformer 433 because the voltage level is different depending on the electrode and the driving waveform. A more detailed description of the voltage driver 430 will be described later with reference to FIGS. 5 and 6.

The plasma display panel 440 is formed by bonding a front substrate (not shown) and a rear substrate (not shown) together. Scan electrodes (not shown) and sustain electrodes (not shown) are formed on the front substrate, and a plurality of address electrodes (not shown) intersecting the scan electrodes and the sustain electrodes are formed on the rear substrate. The plasma display panel 440 is supplied with a driving voltage of a large voltage from the driver 420 so that a reset period for initializing all cells, an address period for selecting a cell to be discharged, and a sustain for discharging the selected cell are maintained. The driving period is divided into a period and an erasing period for erasing wall charges in a discharged cell.

5 is a view for explaining a voltage supply unit according to an embodiment of the present invention.

As shown in FIG. 5, the voltage supply unit 510 according to an embodiment of the present invention may include a filter 511, a rectifier 512, a power factor correction (PFC) 513, a first transformer 514, and a second transformer 514. A transformer 515, a third transformer 516, a fourth transformer 517, and a fifth transformer 518 are included.

The filter 511 blocks the noise included in the external voltage from being input to the voltage supply unit 510, and simultaneously blocks the switching noise of the voltage supply unit 510 from being input to the external voltage input terminal.

The rectifier 512 converts the AC voltage input from the filter 511 into a temporary DC voltage before being converted into the DC voltage required by the VSC unit 520 or the driver 530.

The PFC 513 is a power saving circuit for improving power efficiency of the voltage supply unit 510. For example, the voltage input to the transformers 514, 515, 516, 517 and 518, which are concerned about instantaneous power leakage, is adjusted. That is, the PFC 513 corrects the voltage input to the transformer, and stably supplies the voltage to other functional units. As a result, a more stable voltage can be supplied to each component, and unnecessary power consumption can be reduced. In addition, the unnecessary waste of current can be converted into heat to prevent the temperature from rising, and electromagnetic waves can be reduced.

Each transformer 514, 515, 516, 517, 518 adjusts the voltage level input to the VSC unit 520 or the driver 530. Each transformer is as follows.

The first transformer 514 converts the voltage input from the PFC 513 to the voltage level input to the VSC unit 520. As described above, the VSC unit 520 needs a voltage having various voltage levels, such as a logic voltage or a voltage for an analog signal. Therefore, in one embodiment of the present invention, the voltage of at least one voltage level is supplied to the VSC unit 514 by using the first transformer 514. At this time, the converted voltage level is preferably 3V or more and 30V or less in consideration of the voltage used in the VSC unit 520. In addition, the first transformer 514 is a transformer for converting the voltage supplied to the driving unit 530, that is, the second transformer 515, the third transformer 516, the fourth transformer 517 and the fifth transformer 518 Is electrically insulated from

The second transformer 515 converts the voltage input from the PFC 513 to the voltage level supplied to the driver 530. The driver 530 needs a 5V voltage, which is a logic voltage as described above. Unlike the conventional 5V voltage output from the first transformer 514, the VSC unit 510 is provided by supplying a logic voltage of the driving unit 530 with the second transformer 515 in the embodiment of the present invention. It is possible to suppress the occurrence of noise in the video signal input to.

The third transformer 516 converts the voltage input from the PFC 513 into an address voltage input to the plasma display panel through the driver 530. The address voltage is applied to the address electrode of the plasma display panel in order to select a cell for display discharge.

The fourth transformer 517 converts a voltage input from the PFC 513 into a sustain voltage input to the plasma display panel through the driver 530. The sustain voltage is applied to the scan electrode or the sustain electrode of the plasma display panel to perform display discharge.

The fifth transformer 518 converts the voltage input from the PFC 513 into a voltage used in the standby mode of the plasma display device. The standby mode refers to a state in which no image is displayed on the plasma display panel when the plasma display apparatus is driven. In the standby mode, the other voltage driving the plasma display device is cut off, and at the same time, the standby mode voltage 5V is supplied to the plasma display device. When the standby mode is released and the mode is switched to the normal mode in which the image is displayed on the plasma display panel, the standby mode voltage is cut off.

As described above, according to the exemplary embodiment of the present invention, a second voltage transformer 515 is provided to convert the small voltage, that is, the logic voltage, supplied to the driving unit 530 to be applied to the image signal input to the VSC unit 520. The influence can be suppressed. According to another embodiment of the present invention, as shown in FIG. 6, noise generated when an image is implemented may be suppressed without adding a second second transformer 515.

6 is a view for explaining a voltage supply unit according to another exemplary embodiment of the present invention.

As shown in FIG. 6, the voltage supply unit 610 according to another embodiment of the present invention includes a filter 611, a rectifier 612, a PFC 613, a first transformer 614, and a third transformer 616. , A fourth transformer 617 and a fifth transformer 618.

In another embodiment of the present invention, a 5V voltage, which is a logic voltage, is supplied to the driving unit 630 by using a fifth transformer 618 that converts the voltage input from the PFC 613 into a standby mode voltage. As the standby mode voltage is blocked in the normal mode in which the image is displayed on the plasma display panel, the standby mode voltage converted by the fifth transformer 618 is not used in the normal mode. Accordingly, in another embodiment of the present invention, the voltage converted by the fifth transformer 618 is used in both the standby mode and the normal mode. That is, in the standby mode, the standby mode voltage is supplied, and in the normal mode, the driver 630 is used for supplying the logic voltage. Accordingly, a transformer different from the VSC unit 620 may be used without using the second transformer 515 of FIG. 5.

In the filter 611, the rectifier 612, the PFC 613, the first transformer 614, the third transformer 616, and the fourth transformer 617 of the voltage supply unit 610 according to another embodiment of the present invention. Description of the filter 511, rectifier 512, PFC 513, the first transformer 514, the third transformer 516 of the voltage supply unit 510 according to an embodiment of the present invention described with reference to FIG. ), And performs the same function as the fourth transformer 517 and will be omitted.

7 illustrates an image implemented in a plasma display panel according to an embodiment of the present invention.

As shown in FIG. 7, in the plasma display device according to the exemplary embodiment of the present invention, it can be seen that noise is removed from an image implemented during driving. As shown in Fig. 5 or 6, by supplying the voltage supplied to the drive unit and the VSC unit using a different transformer, the driving voltage of the large voltage applied from the drive unit affects the video signal or logic signal of the small voltage of the VSC unit, etc. Can be prevented.

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

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

As described above, the present invention has an effect of suppressing noise of an image to be implemented by improving the plasma display apparatus.

In addition, the present invention has the effect that the voltage can be stably supplied to each functional unit by improving the plasma display device.

Claims (8)

A VSC (Video Scan Convertor) unit for converting an image signal input from the outside into a signal for driving the plasma display panel; A driver to drive the plasma display panel using the converted signal; And Voltage supply unit for supplying a voltage obtained by converting the voltage input from the outside into different transformers to the VSC unit and the driving unit Plasma display device comprising a. The method of claim 1, And a voltage supplied to the driver is a logic voltage of the driver. The method of claim 2, And the logic voltage is supplied from a standby transformer which converts the standby voltage into a standby voltage. The method of claim 1, And the voltage supplied to the VSC unit is one of a logic voltage of the VSC unit and a voltage for an analog signal. The method of claim 4, wherein The voltage supply unit supplies a voltage of at least one voltage level to the VSC unit by using a transformer. The method of claim 5, And said voltage is 3V or more and 30V or less. The method of claim 1, The voltage supply unit And a transformer for converting the voltage to the voltage applied to the plasma display panel. The method of claim 1, And the transformers are connected to different ground terminals, respectively.

Images