KR100649528B1 - Plasma display and driving device thereof - Google Patents

Abstract

A plasma display device and a driving device thereof are provided to reduce the cost for a circuit element by using one sustain discharging circuit element in the plasma display device in which different voltages are applied to the even and odd X electrodes, respectively during an address period. A driving device of a plasma display device includes a first transistor(Xs) connected to first electrodes(Y) of a first group; a second transistor(Xg) connected to the first electrodes of a second group; a third transistor(Xr) connected between the contact point between the first and second transistors and a first power source(Vs) supplying a first voltage; a fourth transistor(Xf) connected between the contact point between the first and second transistors and a second power source supplying a second voltage lower than the first voltage; a fifth transistor(Xpe) connected between the contact point between the first transistor and the first electrode of the first group and a third power source supplying a third voltage; and a sixth transistor(Xpo) connected between the contact point between the second transistor and the first electrode of the second group and the third power source.

Description

Plasma display and its driving device {PLASMA DISPLAY AND DRIVING DEVICE THEREOF}

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

FIG. 2 is a diagram illustrating a driving circuit of the sustain electrode driver illustrated in FIG. 1.

The present invention relates to a plasma display device and a driving device thereof.

The plasma display device is a display device using a plasma display panel that displays text or an image by using plasma generated by gas discharge.

Such a plasma display device is driven by dividing one frame into a plurality of subfields having respective weights, and selecting discharge cells to emit light and discharge cells not to emit light in an address period of each subfield, and emitting light selected in a sustain period. The discharge cells are sustained and discharged for a period corresponding to the weight of the subfield to display an image.

In the address period of the plasma display device, a plurality of display lines are sequentially scanned to select discharge cells to emit light and discharge cells not to emit light. Therefore, a scan circuit for sequentially scanning a plurality of display lines is required as many as the number of display lines. As a result, the unit cost of the plasma display device increases.

In order to solve this problem, US Publication No. US2002 / 0190930 A1 uses one Y electrode in common in two adjacent display lines. That is, after dividing a plurality of X electrodes into an odd X electrode and an even X electrode, an address discharge is first generated on the odd display line by different voltages applied to the odd and even X electrodes in the address period. After selecting the discharge cells to emit light, an address discharge is caused to occur on the even-numbered display lines to select discharge cells to emit light. As described above, the odd-numbered X electrodes and the even-numbered X electrodes are driven in the address periods TA1 and TA2, while the odd-numbered X electrodes and the even-numbered X electrodes are driven in common in the sustain period TS. As a result, in the driving circuit for driving the X electrode, a circuit for performing sustain discharge must be connected to the odd-numbered X electrode and the even-numbered X electrode, respectively, so that the unit cost of the plasma display device increases.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a driving device thereof capable of reducing the number of circuits for sustain discharge.

According to an aspect of the present invention, there is provided an apparatus for driving a plasma display device that performs a display operation together with a plurality of first electrodes and the plurality of first electrodes. The driving device includes a first transistor connected to a first electrode of a first group among the plurality of first electrodes, and a second transistor connected to a first electrode of a second group among the plurality of first electrodes. A third transistor connected between the contacts of the first and second transistors and a first power supply for supplying a first voltage, and a second voltage lower than the first voltage and the contacts of the first and second transistors; A fourth transistor connected between a second power supply, a fifth transistor connected between a contact between the first transistor and the first electrode of the first group and a third power supply for supplying a third voltage, and the And a sixth transistor connected between the third transistor and the contact between the second transistor and the first electrode of the second group.

According to another feature of the present invention, a plasma display device is provided. The plasma display device supplies a plurality of first electrodes, a first transistor connected between the plurality of first electrodes, and a first power supply for supplying the first voltage, the plurality of second electrodes, and the second voltage. A second transistor connected between the second power source, a third transistor connected between the first electrode of the first group, and a third power source supplying the third voltage, and a first electrode of the second group; A fourth transistor connected between the third power source, and a contact between the first and second transistors and the third and fourth transistors, the first electrode of the first group and the second group of the second group It includes a path separation unit for separating the path by one electrode.

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, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

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

As shown in FIG. 1, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address electrode driver 300, a scan electrode driver 400, and a sustain electrode driver 500. It includes.

The plasma display panel 100 includes a plurality of address electrodes (hereinafter referred to as “A electrodes”) A1 to Am extending in the column direction, and a plurality of sustain electrodes extending in pairs to each other in the row direction (hereinafter, “X”). Electrodes ”(X1 to Xn) and scan electrodes (hereinafter referred to as“ Y electrodes ”) (Y1 to Yn). In general, the X electrodes X1 to Xn are formed corresponding to the respective Y electrodes Y1 to Yn, and the X electrode and the Y electrode perform a display operation for displaying an image in the sustain period. The Y electrodes Y1 to Yn and the X electrodes X1 to Xn are arranged to be orthogonal to the A electrodes A1 to Am. At this time, the discharge space at the intersection of the A electrodes A1 to Am and the X and Y electrodes X1 to Xn and Y1 to Yn forms the cell 12. The structure of the plasma display panel 100 is an example, and a panel having another structure to which the driving waveform described below may be applied may also be applied to the present invention.

The controller 200 receives an image signal from the outside and outputs an address electrode driving control signal, a sustain electrode driving control signal, and a scan electrode driving control signal. The controller 200 divides and drives one frame into a plurality of subfields, and each subfield includes an address period and a sustain period.

The address electrode driver 300 receives an A electrode driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each A electrode.

The scan electrode driver 400 receives a Y electrode driving control signal from the controller 200 and applies a driving voltage to the Y electrode.

The sustain electrode driver 500 receives the X electrode driving control signal from the controller 200 and applies a driving voltage to the X electrode.

In detail, during the address period of each subfield, the address electrode, the scan electrode, and the sustain electrode driver 300, 400, and 500 may select one of the plurality of discharge cells 12 and the discharge cells to emit light in the corresponding subfield. Choose. To this end, the plurality of X electrodes X1 to Xn are divided into odd-numbered X electrodes Xodd and even-numbered X electrodes Xeven, and in the address period TA1, a voltage Vb is applied to the odd-numbered X electrodes Xodd and even-numbered. The scan pulse and the address pulse are applied to the Y electrode and the A electrode of the discharge cell to emit light while the 0V voltage is applied to the first X electrode Xeven. In the address period TA2, a scan pulse and an address are applied to the Y electrode and the A electrode of the discharge cell to emit light while a 0 V voltage is applied to the odd-numbered X electrode Xodd and a Vb voltage is applied to the even-numbered X electrode Xeven. Apply a pulse. During the sustain period of each subfield, the scan electrode driver 400 supplies sustain discharge pulses having a high level voltage Vs and a low level voltage 0V to the plurality of Y electrodes Y1 to Yn alternately. The number of times corresponding to the weight is applied. The sustain electrode driver 500 applies a sustain discharge pulse to the plurality of X electrodes X1 to Xn in a phase opposite to that of the sustain discharge pulse applied to the plurality of Y electrodes Y1 to Yn. In this way, the voltage difference between each Y electrode and each X electrode alternates between the Vs voltage and the -Vs voltage, whereby the sustain discharge is repeatedly generated a predetermined number of times in the discharge cell to be turned on.

Next, with reference to FIG. 2, the drive circuit of the sustain electrode drive part 500 for applying the drive waveform disclosed by US publication number US2002 / 0190930 A1 is demonstrated in detail.

2 is a view illustrating a driving circuit of the sustain electrode driver 500 according to an exemplary embodiment of the present invention. In FIG. 5, only the driving circuit 510 connected to the plurality of X electrodes X1 to Xn is illustrated for convenience of description, and the driving circuit 510 may be formed in the sustain electrode driving unit 500 of FIG. 1. For convenience of explanation, only one Y electrode and two X electrodes Xodd and Xeven are illustrated, and the plurality of Y electrodes Y1 to Yn are illustrated as being connected to the ground terminal 0. In addition, the capacitive component formed by the X electrode and the Y electrode is shown as a panel capacitor Cp.

As shown in FIG. 2, the driving circuit 510 includes a sustain discharge unit 511, first and second voltage applying units 512 and 512, and a path separation unit 514. In FIG. 2, the transistors Xs, Xg, Xr, Xf, Xpe, Xpo, Xbe, and Xbo are shown as n-channel field effect transistors, in particular, n-channel metal oxide semiconductor (NMOS) transistors. Xr, Xf, Xpe, Xpo, Xbe, and Xbo) may be formed with a body diode in the direction from the source to the drain. And other transistors having similar functions instead of NMOS transistors may be used as these transistors (Xs, Xg, Xr, Xf, Xpe, Xpo, Xbe, Xbo). In FIG. 2, the transistors Xs, Xg, Xr, Xf, Xpe, Xpo, Xbe, and Xbo are shown as one transistor, but the transistors Xs, Xg, Xr, Xf, Xpe, Xpo, Xbe, and Xbo are shown as one transistor. Each may be formed of a plurality of transistors connected in parallel.

The sustain discharge unit 511 includes transistors Xs, Xg, Xr, and Xf, inductors Lx, diodes XDr and Xdf, and capacitors Cxr.

The drain of the transistor Xs is connected to the power supply Vs supplying the high level voltage Vs of the sustain discharge pulse, and the source of the transistor Xg having the drain connected to the source of the transistor Xs is the sustain discharge pulse. It is connected to the ground terminal (0V) for supplying a low level voltage (0V).

The contact between the source of the transistor Xs and the drain of the transistor Xg, that is, the second end of the inductor Lx having the first end connected to the node N, is the source of the transistor Xr and the transistor Xf. The second end of the capacitor Cxr, which is connected to the contact between the drain of the transistor and the first end of the transistor Xr is connected to the contact between the drain of the transistor Xr and the source of the transistor Xf, is connected to the ground terminal 0. It is. At this time, the capacitor Cxr is charged with a voltage Vs / 2 that is halfway between the high level voltage Vs of the sustain discharge pulse and the low level voltage 0V. The cathode of the diode XDr having an anode connected to the source of the transistor Xr is connected to the second end of the inductor Lx, and the cathode of the diode XDf having a cathode connected to the drain of the transistor Xf. The anode is connected to the second end of the inductor Lx. The diode XDr is for setting up the rising path which cuts off the current path formed by the body diode of the transistor Yr and increases the voltage of the Y electrode, and the diode XDf is formed due to the body diode of the transistor Yf. It is to set the falling path to cut off the current path and reduce the voltage of the Y electrode. At this time, if the transistors Yr and Yf do not have a body diode, the diodes XDr and XDf may be removed. In addition, the connection order between the inductor Lx, the diode XDr, and the transistor Yr may be changed, and the connection order between the inductor Lx, the diode XDf and the transistor Yf may be changed. For example, an inductor Lx may be connected between the contacts of the transistors Yr and Yf and the capacitor Cxr. In addition, although one inductor Lx is illustrated as being connected to the contacts of the transistors Yr and Yf, the inductor may be connected to each of the rising path formed by the transistor Yr and the falling path formed by the transistor Yf. It may be.

In the sustain discharge unit 511 configured as described above, the transistor Xr is turned on to increase the voltage of the X electrode from the 0V voltage to the Vs voltage by using the resonance of the inductor Lx and the panel capacitor Cp. Xs) is turned on to apply a Vs voltage to the X electrode. After the transistor Xf is turned on to reduce the voltage of the X electrode from the Vs voltage to near the 0V voltage by using the resonance of the inductor Lx and the panel capacitor Cp, the transistor Xg is turned on to 0V at the X electrode. Apply voltage. This process is repeated the number of times corresponding to the weight of the corresponding subfield so that the sustain discharge pulse having the Vs voltage and the 0V voltage are alternately applied to the X electrode in the sustain period TS.

The first voltage applying unit 512 includes a transistor Xbe, and the second voltage applying unit 512 includes a transistor Xbo. The transistor Xbe is connected between the power supply Vb supplying the Vb voltage and the even-numbered X electrode Xeven, and the transistor Xbo is the power supply Vb supplying the Vb voltage and the odd-numbered X electrode Xodd. It is connected between. In the transistors Xbe and Xbo, two transistors are formed in a back-to-back form. In this case, the transistors Xbe and Xbo may be formed of one transistor.

The path separator 514 includes transistors Xpe and Xpo. The transistor Cpe is connected between the node N and the even-numbered X electrode Xeven, and the transistor Cpo is connected between the node N and the odd-numbered X electrode Xodd.

In the driving circuit 510 configured as described above, the transistors Xpe, Xg, and Xbo are turned on in the address period TA1. Then, the 0V voltage is applied to the even-numbered X electrode Xeven and the Vb voltage is applied to the odd-numbered X electrode Xodd. Similarly, in the address period TA2, the transistors Xpo, Xg, and Xbe are turned on. Then, the voltage Vb may be applied to the even-numbered X electrode Xeven and the voltage 0V may be applied to the odd-numbered X electrode Xodd. On the other hand, since the sustain discharge pulse is commonly applied to the X electrodes Xeven and Xodd in the sustain period, both the transistors Xpo and Xpe are turned on when the sustain discharge pulse is applied in the sustain period.

As described above, in the driving circuit 510 according to the exemplary embodiment of the present invention, the sustain discharge unit 511 including the circuit for driving the sustain period TS and the circuit for driving the address period TA1 and TA2 are configured. The path separating unit 514 is formed between the voltage applying units 512 and 513 to separate the paths into the even-numbered X electrodes Xeven and the odd-numbered X electrodes Xodd, thereby driving the sustain period TS. There may be only one circuit for each. Therefore, the circuit cost can be reduced as compared with the conventional art.

Although the 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 present invention, in the plasma display device in which different voltages are applied to the even-numbered and odd-numbered X electrodes in the address period, only one circuit element for sustain discharge is required, thereby reducing the circuit element price. do.

Claims (10)

An apparatus for driving a plasma display device that performs a display operation with a plurality of first electrodes and the plurality of first electrodes, A first transistor connected to a first electrode of a first group among the plurality of first electrodes, A second transistor connected to a first electrode of a second group of the plurality of first electrodes, A third transistor connected between the contacts of the first and second transistors and a first power supply for supplying a first voltage, A fourth transistor connected between the contacts of the first and second transistors and a second power supply for supplying a second voltage lower than the first voltage, A fifth transistor connected between a contact point between the first transistor and the first electrode of the first group and a third power supply for supplying a third voltage; and And a sixth transistor connected between the contact point between the second transistor and the first electrode of the second group and the third power source. The method of claim 1, The first, fourth and sixth transistors are turned on in a first address period to apply the second voltage to the first electrode of the first group and the third voltage to the first electrode of the second group. , In the second address period, the second, fourth, and fifth transistors are turned on to apply the third voltage to the first electrode of the first group, and apply the second voltage to the first electrode of the second group. A driving device of the plasma display device. The method of claim 2, And a scanning pulse is sequentially applied to the second electrode of the discharge cell to emit light in each of the first and second address periods. The method of claim 2, The driving device of the plasma display device, wherein the first and second transistors are turned on in the sustain period. The method according to any one of claims 1 to 4, The first voltage is a higher voltage among voltages applied to the plurality of first electrodes in a sustain period, and the second voltage is a lower voltage among voltages applied to the plurality of second electrodes in the sustain period. drive. The method of claim 5, At least one inductor having a first end connected to the contacts of the third and fourth transistors, A rising path connected between a fourth power supply for supplying a third voltage between the first voltage and the second voltage and a second end of the inductor to increase voltages of the plurality of first electrodes, and And a falling path connected between the fourth power supply and the second end of the inductor to reduce voltages of the plurality of first electrodes. A plurality of first electrodes, A first transistor connected between the plurality of first electrodes and a first power supply for supplying the first voltage, A second transistor connected between the plurality of second electrodes and a second power supply for supplying the second voltage; A third transistor connected between the first electrode of the first group and a third power supply for supplying the third voltage; A fourth transistor connected between the first electrode of the second group and the third power source, and A plasma display connected between the contacts of the first and second transistors and the third and fourth transistors and including a path separation unit separating a path into the first electrode of the first group and the first electrode of the second group Device. The method of claim 7, wherein The path separation unit, A fifth transistor connected between the contacts of the first and second transistors and the first electrode of the first group, and And a sixth transistor connected between the contacts of the first and second transistors and the first electrode of the second group. The method of claim 8, Alternately turning on the first transistor and the second transistor while the fifth and sixth transistors are turned on in a sustain period; Turning on the second, fourth, and fifth transistors in a first address period, And turning on the second, third and sixth transistors in a second address period. The method of claim 9, At least one inductor having a first end connected to the contacts of the first and second transistors, A capacitor charged with a third voltage between the first voltage and the second voltage and connected to the second end of the inductor, A seventh transistor connected between the inductor and the capacitor, and Further comprising an eighth transistor connected between the inductor and the capacitor, In the retention period, Before turning on the first transistor, the seventh transistor is turned on to increase the voltage of the plurality of first electrodes, And turning on the eighth transistor to reduce the voltages of the plurality of first electrodes before the second transistor is turned on.

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