KR20090096046A - Plasma Display Apparatus - Google Patents

Abstract

A plasma display apparatus is provided to supply a stable drive pulse with low distortion of a noise by reducing a noise supplied to a sustain electrode. In a plasma display apparatus, driving parts(200, 300) operate a plasma display panel. A first regular voltage part(410) is electrically connected with the driving part, and a second ground level voltage part(420) is spatially separated from the first regular voltage part. A reference separation controller(600) connects a first and a second reference voltage part electrically and disconnects them, and the reference connection part(220) electrically connects the sustain electrode and the second reference voltage part.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

The present invention relates to a display device, and more particularly, to a plasma display device.

In general, a plasma display apparatus is formed by attaching a plasma display panel for displaying an image and a driving unit for driving the plasma display panel to a rear surface of the plasma display panel.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form a unit discharge cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He). An inert gas containing a main discharge gas such as and a small amount of xenon is filled. A plurality of unit discharge cells described above are gathered to form one pixel. For example, a red (R) cell, a green (G) cell, and a blue (B) cell may form one pixel.

When a high frequency voltage is applied to such a unit discharge cell to discharge, an inert gas generates vacuum ultra violet rays and emits phosphors formed between the partition walls to realize an image.

The plasma display panel includes a plurality of electrodes, for example, a scan electrode (Y), a sustain electrode (Z), and an address electrode (X), each of which has driving parts for supplying a driving voltage to the electrodes of the plasma display panel. Is connected to.

Each driving unit implements an image by supplying driving pulses, such as a reset pulse in a reset period, a scan pulse in an address period, and a sustain pulse in a sustain period, to the electrodes of the plasma display panel when driving the plasma display panel. will be. Such a plasma display device has a spotlight as a display device because of its thin and light configuration.

The driving unit for driving such a plasma display panel is a field in which research is being actively conducted based on cost reduction and reliability of circuit operation.

An object of the present invention is to provide a plasma display device capable of reducing noise distortion of a driving pulse while increasing space utilization.

Plasma display device according to an embodiment of the present invention for achieving the above object is a plasma display panel including a sustain electrode, a drive unit for driving the plasma display panel, a first reference voltage unit electrically connected to the drive unit, the first A second reference voltage part spatially separated from the reference voltage part, a reference separation controller electrically connecting or disconnecting the first reference voltage part and the second reference voltage part, and a reference connection part electrically connecting the sustain electrode and the second reference voltage part; Include.

In addition, the reference connection may include a printed circuit board.

In addition, the reference separation controller may include a switching element.

In addition, the reference separation controller may include connecting the first reference voltage unit and the second reference voltage unit during the reset period and the address period, and separating the first reference voltage unit and the second reference voltage unit during the sustain period after the address period. have.

In addition, the first reference voltage unit and the second reference voltage unit may include the same material.

As described above, the plasma display device according to the embodiment of the present invention reduces the noise supplied to the sustain electrode, thereby providing a stable driving pulse with less distortion due to noise.

In addition, the plasma display device according to an embodiment of the present invention has the effect of reducing the cost while increasing the space utilization for the configuration device.

1 is for explaining a plasma display device according to an embodiment of the present invention.

Referring to FIG. 1, the plasma display apparatus according to the present invention includes a plasma display panel 100, a scan driver 200 for driving scan electrodes Y1 to Yn formed in the plasma display panel 100, and an address electrode X1. To Xm), a data driver 300 for supplying data, and a controller (not shown) for controlling the respective drivers.

The plasma display panel 100 is bonded to a front substrate (not shown) and a rear substrate (not shown) at regular intervals, and a plurality of electrodes, for example, scan electrodes Y1 to Yn and a sustain electrode (for example) are attached to the front substrate. Z1 to Zn are formed in pairs, and address electrodes X1 to Xm are formed on the rear substrate to intersect the scan electrodes Y1 to Yn and the sustain electrode Z.

The scan driver 200 scans a reset pulse for initializing the wall charge states of all the discharge cells in the previous subfield during the reset period, for example, a set up pulse that is a reset rising pulse and a set down pulse that is a reset falling pulse. Yn).

In addition, the scan driver 200 sequentially supplies scan pulses having the lowest voltage to the scan voltage (−Vy) to the scan electrodes Y1 to Yn while maintaining the scan bias voltage Vsc during the address period.

In addition, the scan driver 200 may generate a sustain discharge by supplying a sustain pulse swinging the positive sustain voltage and the negative sustain voltage during the sustain period.

Here, one end of the scan driver 200 is electrically connected to the scan electrodes Y1 to Yn, and the other end is electrically connected to one end of the first reference voltage unit 410 and the reference separation controller 600.

In this case, the sustain electrodes Z1 to Zn are electrically connected in common with the other ends of the second reference voltage unit 420 and the reference separation controller 600.

The reference separation controller 600 electrically connects or disconnects the first reference voltage unit 410 and the second reference voltage unit 420.

The data driver 300 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like, and then data mapped to each subfield is supplied by the subfield mapping circuit. The data driver 300 samples and latches data in response to the timing control signal CTRX, and then supplies the data to the address electrodes X1 to Xm. According to such data, a discharge cell that is turned on / off, i.e., a cell that generates sustain discharge, which is a display discharge, is selected in the sustain period.

The sustain pulse is supplied to the discharge cells supplied with the data pulses during the sustain period, and wall charges such that sustain discharge is generated are formed.

2 is for explaining the configuration of a plasma display device according to an embodiment of the present invention.

Referring to FIG. 2, a plasma display device according to an embodiment of the present invention is disposed between a plasma display panel including a sustain electrode, a driver for driving a plasma display panel, a plasma display panel and a driver, and generated from the plasma panel and the driver. A heat dissipation frame for generating heat, a first reference voltage unit electrically connected to the driving unit, a second reference voltage unit and a sustain electrode physically separated from the first reference voltage unit and disposed on the heat dissipation frame; And a reference connection portion electrically connecting the second reference voltage portion.

The driver includes a scan driver 200 and a data driver 300.

The scan driver 200 is electrically connected to a scan electrode (not shown) through a flexible printed circuit (FPC) 210, and the data driver 300 is connected to the flexible printed circuit 310. The address electrode (not shown) is electrically connected, and the sustain electrode (not shown) is electrically connected to the second reference voltage unit 420.

The heat dissipation frame 400 may be disposed on a rear surface of the plasma display panel (not shown) to support the plasma display panel, and may radiate heat generated from the plasma display panel to the outside. The heat dissipation frame 400 may include the scan driver 200 and the data driver 300 on a surface opposite to the surface on which the plasma display panel (not shown) is disposed, and the scan driver 200 and the scan driver 200 disposed as described above. The data driver 300 may be supported, and heat generated from the scan driver 200 and the data driver 300 may be emitted to the outside.

The control unit 500 receives the vertical / horizontal synchronization signal and the clock signal and receives timing control signals for controlling the operation timing and synchronization of the scan driver 200 and the data driver 300 in the reset period, the address period, and the sustain period. And the timing control signals are supplied to the scan driver 200 and the data driver 300 to control the scan driver 200 and the data driver 300.

The scan driver 200, the data driver 300, the heat dissipation frame 400, the control unit 500, or the like may be bonded using a conductive tape or may be connected to each other by arranging a connector.

The first reference voltage unit 410 functions to form the first reference voltage and may be formed of a predetermined area of an electrically conductive material. For example, the heat dissipation frame may be formed in a copper foil shape having a predetermined area while being spatially and electrically separated from the heat dissipation frame, or may be formed by attaching an electrically conductive material to the case of the plasma display apparatus. . In addition, it may be variously formed.

The second reference voltage unit 420 functions to form a second reference voltage by being spatially and electrically separated from the above-described first reference voltage unit 410.

As such, the second reference voltage unit 420 may be any one of the above-described examples of the first reference voltage unit 410 except for the first reference voltage unit 410. Accordingly, the first reference voltage unit 410 and the second reference voltage unit 420 may be made of the same material. In addition, by using the same material, the first reference voltage unit 410 and the second reference voltage unit 420 can be produced in the same process.

The reference separation controller 600 controls to connect or disconnect the first reference voltage unit 410 and the second reference voltage unit 420. Accordingly, the reference separation controller 600 may include a switching device. That is, as long as the first reference voltage unit 410 and the second reference voltage unit 420 can be easily connected or separated, any one can be used.

The reference separation controller 600 may connect the first reference voltage unit 410 and the second reference voltage unit 420 to each other during the reset period and the address period, and may separate the sustain voltage during the sustain period.

By doing in this way, it is possible to prevent the displacement current which may be caused by the sustain pulse supplied to the scan electrode and the sustain electrode during the sustain period from flowing to the data electrode. Accordingly, the efficiency loss of the discharge can be reduced. In addition, since the first reference voltage unit 410 and the second reference voltage unit 420 are separated during the sustain period, counter discharge between the scan electrode and the data electrode can be prevented in advance.

The second reference voltage unit 420 is electrically connected to the sustain electrode (not shown) through the reference connection unit 220. In this case, the reference connection portion is a printed circuit board (PCB) 220. As such, when the sustain electrode and the second reference voltage unit 420 are connected to each other through a printed circuit board 220, the noise is compared with the direct connection between the heat radiation frame and the sustain electrode. It is possible to implement waveforms with less distortion and more stable.

For example, in the case of a single sustain, the sustain electrode always maintains the ground level voltage GND or is supplied with the sustain bias voltage Zbias. When the sustain electrode is directly connected to the heat dissipation frame (GND) or connected to the heat dissipation frame (GND) using a flexible printed circuit (FPC), the noise generated through the heat dissipation frame is directly directed to the sustain electrode. It was supplied and noise was frequently generated. This is because, in the case of the heat radiating frame, the noise is generated at a predetermined level or more even when no discharge occurs.

Accordingly, by directly connecting the sustain electrode and the second reference voltage unit 420 through a printed circuit board 220, the waveform is less stable due to noise generated in the heat dissipation frame and more stable waveforms can be realized. Can be.

In addition, a circuit capable of supplying a simple sustain bias voltage Zbias to a printed circuit board 220 may be configured. That is, by constructing a circuit capable of supplying the sustain bias voltage Zbias to the printed circuit board 220, the sustain bias voltage Zbias is sustained in one or more of a reset period and an address period. It can be supplied to the electrode.

The configuration of the plasma display device of the present invention described above is not limited to the configuration of the present invention as an embodiment for the convenience of understanding. In other words, even if the configuration and operation of the driving apparatus are slightly varied, it is considered that the configuration of the driving unit of the present invention as shown in the claims is included in the present invention.

3 illustrates a structure of a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a plasma display panel according to an embodiment of the present invention includes a front panel 110 including a front substrate 111 on which a scan electrode 112 and a sustain electrode 113 are formed, and the scan electrode described above. The rear panel 120 including the rear substrate 121 on which the address electrode 123 intersects the 112 and the sustain electrode 113 is formed is bonded to each other at a predetermined interval.

Here, the scan electrode 112 and the sustain electrode 113 formed on the front substrate 111 are formed in parallel with each other to generate a discharge in the discharge cell and maintain the discharge of the discharge cell.

The scan electrode 112 and the sustain electrode 113 formed on the front substrate 111 need to consider light transmittance and electrical conductivity in order to emit light generated in the discharge cell to the outside and to secure driving efficiency. Accordingly, each of the scan electrode 112 and the sustain electrode 113 may include bus electrodes 112b and 113b made of metal such as silver and transparent electrodes 112a and indium tin oxide (ITO). 113a).

An upper dielectric layer 114 may be formed on the front substrate 111 on which the scan electrode 112 and the sustain electrode 113 are formed to cover the scan electrode 112 and the sustain electrode 113.

The upper dielectric layer 114 limits the discharge current of the scan electrode 112 and the sustain electrode 113 and insulates the scan electrode 112 and the sustain electrode 113.

A protective layer 115 may be formed on the upper dielectric layer 114 to facilitate discharge conditions. The protective layer 115 may be made of magnesium oxide (MgO) having a high secondary electron emission coefficient.

Meanwhile, the address electrode 123 formed on the rear substrate 121 is an electrode for supplying a data signal to the discharge cells.

The lower dielectric layer 125 may be formed on the rear substrate 121 on which the address electrode 123 is formed to cover the address electrode 123.

In the upper portion of the lower dielectric layer 125, a discharge space, that is, a partition wall 122 for partitioning the discharge cells is formed. In the discharge cells partitioned by the partition wall 122, a phosphor layer 124 is formed that emits visible light for image display during address discharge. For example, red (R), green (G), and blue (B) phosphor layers may be formed.

In the plasma display panel according to the exemplary embodiment described above, when a driving signal is supplied to the scan electrode 112, the sustain electrode 113, and the address electrode 123, the plasma display panel may be disposed in the discharge cell partitioned by the partition wall 122. Discharge occurs in the image to realize the image.

In FIG. 3, only the plasma display panel according to the exemplary embodiment is illustrated and described, but it is not limited thereto.

The operation of the plasma display device according to the exemplary embodiment of the present invention including the plasma display panel will be described with reference to FIG. 4.

4 illustrates an operation of a plasma display device according to an embodiment of the present invention.

Referring to FIG. 4, the scan driver driving the plasma display device according to an embodiment of the present invention may supply a reset pulse to the scan electrode during a reset period for initialization. The reset pulse may include a reset rising pulse Ramp-Up and a reset falling pulse Ramp-Down.

For example, in the set-up period, the voltage gradually increases from the second voltage V2 to the third voltage V3 after the voltage rises rapidly from the first voltage V1 to the second voltage V2 with the scan electrode. The reset rising pulse Ramp-Up may be supplied. Here, the first voltage V1 may be the ground voltage level GND.

In this set-up period, a setup dark, which is a weak dark discharge, occurs in the discharge cell by the reset rising pulse Ramp-Up. Due to the set-up discharge, some wall charge may be accumulated in the discharge cell.

During the set-down period after the set-up period, the reset ramp-up pulse in the opposite polarity direction is applied to the scan electrode after the reset ramp-up pulse. Can be supplied.

Here, the reset falling pulse Ramp-Down gradually increases from the peak voltage of the reset rising pulse Ramp-Up, that is, the fourth voltage V4 to the fifth voltage V5 lower than the third voltage V3. Can descend.

As the reset falling pulse Ramp-Down is supplied, a weak erase discharge, that is, a set-down discharge occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can stably occur in the discharge cells remain uniform.

In the address period after the reset period, a scan bias pulse that substantially maintains the lowest voltage of the reset falling pulse Ramp-Down, that is, a voltage higher than the fifth voltage V5, for example, the sixth voltage V6, is supplied to the scan electrode. do.

In addition, a scan pulse falling from the scan bias pulse may be supplied to the scan electrode.

As such, when the scan pulse is supplied to the scan electrode, the data pulse may be supplied to the address electrode corresponding to the scan pulse.

When the scan pulse and the data pulse are supplied, an address discharge may be generated in the discharge cell to which the data pulse is supplied while the voltage difference between the scan pulse and the data pulse and the wall voltage generated by the wall charges generated in the reset period are added. .

In addition, although the ground level voltage GND is maintained at the sustain electrode in FIG. 4, the sustain bias voltage may be supplied to the sustain electrode from the set-down period after the set-up period to the address period. It is. By supplying the sustain bias voltage to the sustain electrode, more efficient and stable reset discharge and address discharge can be generated.

In the above-described reset period and the address period, the switch in the reference separation controller is turned on, so that the first reference voltage unit and the second reference voltage unit are commonly connected, and the reference separation controller is turned off in the sustain period described later. The first reference voltage portion and the second reference voltage portion are separated so that the address electrode is in a floating state.

Subsequently, in the sustain period for displaying an image, a sustain pulse in which the positive sustain voltage Vs and the negative sustain voltage (-Vs) are alternately repeated may be supplied to the scan electrode, and the sustain electrode may be supplied with the ground voltage. Can be maintained at the (GND) level.

When such a sustain pulse is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain pulse, and the sustain discharge, that is, the display between the scan electrode and the sustain electrode when the sustain pulse is supplied. Discharge may occur.

At this time, when the first reference voltage part and the second reference voltage part electrically connected by the reference separation controller are separated, a ground voltage difference occurs between the scan electrode and the address electrode, and thus floating due to a change in the sustain pulse in the address electrode. ) Can lead to a state.

As such, during the sustain period in which the sustain pulse is supplied to the scan electrode, the address electrode may be in a floating state and may be swung under the influence of the sustain pulse supplied to the scan electrode. Accordingly, the floating supplied to the address electrode is shaped differently from the voltage magnitude of the sustain pulse but substantially the same as the period of the sustain pulse.

As shown in FIG. 4 described above, the reference separation controller may connect or disconnect the first reference voltage unit and the second reference voltage unit. Accordingly, by forming a pulse similar to the sustain pulse supplied to the scan electrode Y during the sustain period, to the floating address electrode, the counter discharge generated when the discharge cell repeatedly discharges during the sustain period is suppressed. If so, discharge can occur well.

4 is a view illustrating an example of a method of operating a plasma display panel according to an embodiment of the present invention. The present invention is not limited to FIG. 4, and the plasma display panel is operated according to an embodiment of the present invention. The method can be changed in various ways.

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 respects, and the scope of the present invention is indicated by the following claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be construed as being included in the scope of the present invention.

1 is for explaining a plasma display device according to an embodiment of the present invention.

2 is for explaining the configuration of a plasma display device according to an embodiment of the present invention.

3 illustrates a structure of a plasma display panel according to an exemplary embodiment of the present invention.

4 illustrates an operation of a plasma display device according to an embodiment of the present invention.

Claims (6)

A plasma display panel including a sustain electrode; A driving unit driving the plasma display panel; A first reference voltage unit electrically connected to the driving unit; A second reference voltage part spatially separated from the first reference voltage part; A reference separation controller electrically connecting or separating the first reference voltage unit and the second reference voltage unit; And A reference connector electrically connecting the sustain electrode and the second reference voltage part; Plasma display device comprising a. According to claim 1, And the reference connection portion is a printed circuit board. The method according to claim 1 or 2, And the reference separation controller comprises a switching element. The method according to claim 1 or 2, The reference separation control unit connects the first reference voltage unit and the second reference voltage unit during a reset period and an address period, and separates the first reference voltage unit and the second reference voltage unit during a sustain period after the address period. Plasma display device, characterized in that. The method of claim 3, wherein The reference separation control unit connects the first reference voltage unit and the second reference voltage unit during a reset period and an address period, and separates the first reference voltage unit and the second reference voltage unit during a sustain period after the address period. Plasma display device, characterized in that. The method according to claim 1 or 5, And the first reference voltage unit and the second reference voltage unit are made of the same material.

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