KR20060126272A - Plasma display apparatus - Google Patents

Abstract

A plasma display device is provided to restrict electric damage of a data drive IC(Integrated Circuit) by regulating the arrangement of data supplied to an address electrode corresponding to the data drive IC according to the magnitude of displacement current. A plasma display device includes a plasma display panel(600) having a plurality of address electrodes(X1~Xm); a data driving unit(601) having a plurality of data drive ICs(607a,607b,607c) for supplying data to the address electrodes; and a data control unit(606) for controlling the data supplied to the address electrode corresponding to the data drive ICs according to the displacement current of the data provided to the address electrodes corresponding to the data drive ICs, by controlling the data driving unit.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 is a diagram showing the structure of a typical plasma display panel.

2 is a view for explaining an arrangement structure of electrodes in a typical plasma display panel.

3 is a view for explaining a data drive integrated circuit in a conventional plasma display device in more detail.

4 is a diagram for conceptually explaining a displacement current generated when data is supplied to an address electrode.

FIG. 5 is a diagram for explaining an equivalent capacitance determined according to a pattern of data supplied to the address electrode X, and the magnitude of the displacement current id accordingly.

6 is a diagram for explaining the structure of a plasma display device of the present invention;

7 is a view for explaining an example of a structure in which a plurality of data drive integrated circuits are electrically connected to an address electrode of a plasma display panel.

8A to 8C are diagrams for explaining a method of adjusting data supplied from one data drive integrated circuit.

<Explanation of symbols for the main parts of the drawings>

600: plasma display panel 601: data driver

602: scan driver 603: sustain driver

604: data alignment unit 605: displacement current calculation unit

606: data controller

607a, 607b, 607c: Data Drive Integrated Circuits

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, wherein a data drive integrated circuit is controlled by adjusting data according to a displacement current of data supplied to a data drive integrated circuit of a data driver for supplying data to an address electrode (X). The present invention relates to a plasma display device that prevents electrical damage.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. 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 panel has a spotlight as a next generation display device because of its thin and light configuration.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front panel in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are arranged on a front glass 101 that is a display surface on which an image is displayed. The rear panel 110 on which the plurality of address electrodes 113 are arranged so as to intersect the plurality of sustain electrode pairs on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is made of a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode (a) formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the bus electrode b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and to facilitate the discharge conditions on the upper dielectric layer 104 top surface. A protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear panel 110 is arranged such that a plurality of discharge spaces, that is, barrier ribs 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 which perform address discharge to generate vacuum ultraviolet rays are arranged in parallel with the partition wall 112. On the upper side of the rear panel 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A lower dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

In the plasma display panel having such a structure, a plurality of discharge cells are formed in a matrix arrangement. Such a discharge cell is formed at a point where the scan electrode or the sustain electrode intersects the above-described address electrode. The electrode arrangement for forming a plurality of discharge cells in a matrix array structure is as follows.

2 is a view for explaining an arrangement structure of electrodes in a general plasma display panel.

As illustrated in FIG. 2, in a typical plasma display panel 200, for example, scan electrodes Y1 to Yn and sustain electrodes Z1 to Zn are arranged side by side, and address electrodes X ₁ to Xm are arranged to intersect with each other. Is formed.

Predetermined driving units for applying a predetermined driving signal to the electrodes of the plasma display panel 200 having the electrode array structure are connected. Accordingly, a driving signal is applied to the electrodes of the plasma display panel 200 by the driving units described above to implement an image. The driving units coupled to the plasma display panel 200 are referred to as plasma display apparatuses.

In this electrode array structure, data is supplied to the address electrode X described above in an address period, and this data is supplied by a data drive integrated circuit of the data driver. This data drive integrated circuit will be described with reference to FIG. 3.

3 is a view for explaining a data drive integrated circuit in a conventional plasma display device in more detail.

As shown in FIG. 3, the data drive integrated circuit 302 denotes an address of a predetermined region among the address electrodes X of the plasma display panel 300, for example, the address electrode X of the region A 301 as shown in FIG. 3. Feed the data over time. The data drive integrated circuit 302 includes a plurality of channels, for example, channels 1 to 7, each of which includes one address electrode X, for example, an X ₁ address electrode to X _7. The address electrode X up to the address electrode is electrically connected to supply data.

When data is supplied from the data drive integrated circuit 302 to each of the address electrodes X, the displacement current id is generated by the supplied data, which is conceptually described with reference to FIG. 4. same.

4 is a diagram for conceptually explaining a displacement current generated when data is supplied to an address electrode.

As shown in FIG. 4, in the plasma display panel, an equivalent capacitance is formed between the address electrodes X, and between the address electrode X and the scan electrode Y, and the address electrode X and the sustain electrode. An equivalent capacitance is also formed between (Z).

For example, as shown in FIG. 4, a pair of sustain electrodes, for example, one at a point where the parallel scan electrodes Y _A and the sustain electrodes Z _A as shown in FIG. 4 intersect the address electrodes X _{A and} X _B , respectively. Discharge cells are formed. Here, the capacitor C1 having a capacitance of a predetermined size is equivalently formed between the above-described address electrode X _A and the scan electrode Y _A. In addition, a capacitor C2 having a capacitance of a predetermined size is equivalently formed between the address electrode X _A and the sustain electrode Z _A. In addition, a capacitor C3 having a capacitance of a predetermined size is equivalently formed between the X _A address electrode and the X _B address electrode.

As such, one discharge cell of the plasma display panel is equivalently interpreted as a capacitor having a capacitance of a predetermined size.

The displacement current id flowing through one address electrode X when the plasma display panel is driven is determined according to the equivalent capacitance of the discharge cell and the change rate of the voltage per unit time.

This displacement current id is generally determined by the following equation (1).

Displacement current (id) = C (capacitance) × dV / dt

Looking more closely at Equation 1, it can be seen that the displacement current id flowing when the change rate of the voltage V per time t is constant is determined by the equivalent capacitance C value. That is, when the equivalent capacitance C value increases, the displacement current id increases. On the contrary, when the equivalent capacitance C value decreases, the displacement current id decreases.

The equivalent capacitance C described above is determined according to a pattern of data supplied to the address electrode X. FIG. As described above, the equivalent capacitance C determined according to the data pattern will be described with reference to FIG. 5.

FIG. 5 is a diagram for describing an equivalent capacitance determined according to a pattern of data supplied to the address electrode X and a magnitude of the displacement current id.

As shown in FIG. 5, when the pattern of data supplied to the address electrode X is repeatedly switched off and on data, that is, the off cell 500 and the on cell 501. Is repeated regularly, a voltage difference is generated between the on-cell and the off-cell in this transverse direction, and a Cb equivalent capacitance is formed, and a voltage difference is generated between the on-cell and the off-cell in the longitudinal direction, thereby forming Ca equivalent capacitance, respectively. .

Accordingly, the total equivalent capacitance of FIG. 5 generates a total of nine data switchings in the vertical direction, thereby forming an equivalent capacitance of 9Ca, and an equivalent capacitance of 8Cb is formed due to a total of eight voltage differences in the horizontal direction. As a result, the total equivalent capacitance of FIG. 5 is 9Ca + 8Cb.

Therefore, the displacement current id flowing in the case of the data pattern of FIG. 5 is maximum, that is, (9Ca + 8Cb) x dV / dt.

In the case of the data pattern as shown in FIG. 5, excessive displacement current such as (9Ca + 8Cb) × dV / dt flows in one data drive integrated circuit, thereby causing electrical damage to the data drive integrated circuit. There is a problem.

In order to solve this problem, in the related art, when a data pattern as shown in FIG. 5 is input, a gain of an image is reduced to prevent electrical damage of a data drive integrated circuit. However, this method of reducing gain is disadvantageous because it causes a problem of reducing the luminance of the entire screen. That is, one plasma display panel is equipped with a plurality of data drive integrated circuits, for example, a total of 14 data drive integrated circuits. The data pattern shown in FIG. 5 has a specific data drive among the 14 data drive integrated circuits described above. It is supplied to an integrated circuit, and even if a general data pattern is input to the remaining 13 data drive integrated circuits, the image quality is deteriorated by reducing the gain of the entire screen to prevent electrical damage of one data drive integrated circuit.

In order to solve this problem, the present invention adjusts the data supplied to the address electrode X by the data drive integrated circuit according to the pattern of the data supplied to the address electrode X by each data driver integrated circuit. It is an object of the present invention to provide a plasma display device that prevents deterioration of image quality while preventing electrical damage of a drive integrated circuit.

The plasma display apparatus of the present invention for achieving the above object is a data display unit and a data driver including a plasma display panel including a plurality of address electrodes, a plurality of data drive integrated circuit for supplying data to the plurality of address electrodes And controlling the data to adjust the data supplied to the address electrodes corresponding to the plurality of data drive integrated circuits according to the displacement current of the data supplied to the address electrodes corresponding to the plurality of data drive integrated circuits. ,

Further, the data controller may rearrange the order of the data supplied to the corresponding address electrodes in the data drive integrated circuit in which the displacement current of the data supplied to the corresponding address electrodes among the plurality of data drive integrated circuits is equal to or greater than a preset threshold current. It features.

The data controller may block supply of data to the corresponding address electrode in the data drive integrated circuit having a displacement current of the data supplied to the corresponding address electrode among the plurality of data drive integrated circuits equal to or greater than a predetermined threshold current. do.

The data controller may supply data to all the address electrodes of the data drive integrated circuit in which the displacement current of the data supplied to the corresponding address electrodes of the plurality of data drive integrated circuits is equal to or greater than a predetermined threshold current.

Hereinafter, a plasma display device of the present invention will be described in detail with reference to the accompanying drawings.

6 is a view for explaining the structure of the plasma display device of the present invention.

Referring to FIG. 6, in the plasma display device of the present invention, the scan electrodes Y ₁ to Yn and the sustain electrode Z, and the plurality of address electrodes X ₁ to Xm intersecting the scan electrodes and the sustain electrode Z are illustrated. And a combination of at least one subfield in which a driving pulse is applied to the address electrodes X ₁ to Xm, the scan electrodes Y ₁ to Yn, and the sustain electrode Z in the reset period, the address period and the sustain period. Plasma display panel 600 representing an image made of a frame, data driver 601 for supplying data to address electrodes X ₁ to Xm formed in plasma display panel 600, and scan electrodes Y and ₁ to Yn), the scan driver 602 for driving the common electrode and the sustain electrode (Z) sustain driver 603 for driving the re-received subfield supplies the image data mapped The data alignment unit 604 to be arranged, the shift current calculator 605 for calculating the displacement current id of the image data aligned by the data alignment unit 604, and the displacement current calculator 605 described above. The data control unit 606 for controlling the supply of data in accordance with the displacement current and the data driver 601 described above are electrically connected to the address electrode X of the plasma display panel 600, and thus the above-described address electrode ( X) a plurality of data drive integrated circuits 607a, 607b, 607c for supplying data.

Here, the aforementioned plasma display panel 600 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, and a plurality of electrodes, for example, scan electrodes (Y ₁ to Yn) and sustain. A plurality of sustain electrodes including the electrodes Z are formed, and the address electrodes X ₁ through Xm are formed to intersect the sustain electrodes including the scan electrodes Y ₁ to Yn and the sustain electrode Z. do.

The scan driver 602 supplies the rising ramp waveform Ramp-up to the scan electrodes Y ₁ to Yn during the setup period of the reset period, and also under the control of the set down pulse control unit 501, the set down period of the reset period. While the ramp ramp Ramp-down is supplied to the scan electrodes (Y ₁ to Yn). In addition, the scan driver 602 sequentially supplies the scan pulse Sp of the scan voltage (-Vy) to the scan electrodes Y ₁ to Yn during the address period, and supplies the sustain pulse SUS during the sustain period. To Y (Y ₁ to Yn).

The sustain driver 603 supplies the bias voltage Vz to the sustain electrodes Z during at least one of a set down period and an address period under the control of a timing controller (not shown), and the scan driver 602 and the sustain driver 602 during the sustain period. Alternatingly, the sustain pulses SUS are supplied to the sustain electrodes Z.

After the inverse gamma correction and error diffusion are performed by an inverse gamma correction circuit, an error diffusion circuit, or the like, the data alignment unit 604 is supplied with image data mapped to each subfield by the subfield mapping circuit. Reorder the subfield mapped image data.

The displacement current calculator 605 calculates the displacement current id of the realigned image data by the data alignment unit 604 described above. Here, the above-described displacement current calculator 605 corresponds to the data drive integrated circuits 607a, 607b, and 607c through the plurality of data drive integrated circuits 607a, 607b, and 607c included in the data driver 601. The displacement current of the image data supplied to the address electrode X of the display panel 600 is calculated.

The operation of the displacement current calculator 605 will be more apparent in the following description of FIG. 7.

The data controller 606 stores the plurality of data drive integrated circuits 607a, 607b, and 607c according to the displacement current of the data supplied to the address electrodes X corresponding to the plurality of data drive integrated circuits 607a, 607b, and 607c described above. Data supplied to the address electrode X corresponding to the &quot;

The data driver 601 includes a plurality of data drive integrated circuits 607a, 607b, and 607c for supplying data to the plurality of address electrodes X, and includes a plurality of data drive integrated in the data driver 601. Circuits 607a, 607b, and 607c respectively supply data to corresponding address electrodes X. FIG.

An example of a structure in which the plurality of data drive integrated circuits 607a, 607b, and 607c are connected to the address electrode X of the plasma display panel 600 will be described with reference to FIG. 7 to help understand the operation of the plasma display apparatus. As follows.

FIG. 7 is a diagram for explaining an example of a structure in which a plurality of data drive integrated circuits are electrically connected to address electrodes of a plasma display panel.

Referring to FIG. 7, the data drive integrated circuit 701 supplies data in an address period to a predetermined region of the address electrode X of the plasma display panel 700, for example, the address electrode X of region A as shown in FIG. 7. do. The data drive integrated circuit 701 includes a plurality of channels, for example, channels 1 through 10, each of which includes one address electrode X, for example, an X ₁ address electrode from X _10. The address electrode X up to the address electrode is electrically connected to supply data. In this manner, the data drive integrated circuit 702 supplies the data in the address period to the address electrode X of the region B including the channels 11 to 20 channels, and the channels 21 to 30 channels are supplied. The data drive integrated circuit 703 supplies the data to the address electrode X of the C region to be included in the address period, and the address 704 of the address electrode X of the D region including channels 31 to 40. Of the data drive integrated circuit supplies data in the address period, and the data drive integrated circuit of the symbol 705 supplies the data in the address period to the address electrode X in the E region including the channels 41 to 50. .

That is, the plurality of data drive integrated circuits 701, 702, 703, 704, and 705 respectively supply data to different address electrodes X, and the displacement current calculator 605 of FIG. 6 described above is described above. The displacement current of the data supplied to the address electrode X from the data drive integrated circuit from the data drive integrated circuit 701 to the data drive integrated circuit 705 is calculated. For example, the displacement current calculator 605 of FIG. 6 is supplied to the address electrodes from the X ₁ address electrodes to the X ₁₀ address electrodes through channels ₁ through 10 of the data drive integrated circuit 701. To calculate the displacement current of the data

In addition, the data control unit 606 of FIG. 6 uses the displacement current calculated by the above-described displacement current calculating unit 605, so that the address electrode X corresponding to the data drive integrated circuit, for example, the data drive integrated circuit of 701 of FIG. That is, the data supplied to the address electrodes from the X ₁ address electrode to the X ₁₀ address electrode is adjusted. As shown in FIGS. 8A to 8C, an example of a method of adjusting the data supplied to the address electrode X is adjusted. Looking at it as follows.

8A through 8C are diagrams for describing a method of controlling data supplied from one data drive integrated circuit.

First, referring to FIG. 8A, in the pattern of the data supplied to the address electrode X, the off data and the on data are repeatedly switched, that is, the off cell 800 and the on cell (a). 801 is repeated regularly to generate a voltage difference between the on-cell and off-cell in the horizontal direction to form a Cb equivalent capacitance, and to generate a voltage difference between the on-cell and off-cell in the vertical direction to form a Ca equivalent capacitance, respectively. Is shown.

In the total equivalent capacitance of (a), a total of nine data switching occurs in the vertical direction, thereby forming an equivalent capacitance of 9Ca, and an equivalent capacitance of 8Cb is formed due to a total of eight voltage differences in the horizontal direction. After all, the total equivalent capacitance of (a) is 9Ca + 8Cb. Therefore, in the case of the data pattern of (a), the displacement current id calculated by the above equation (1) is maximum, that is, (9Ca + 8Cb) x dV / dt.

The displacement current calculation unit 605 of FIG. 6 described above calculates the displacement current according to the input data.

On the other hand, in the case of the data pattern as shown in FIG. (A), excessive displacement current such as (9Ca + 8Cb) x dV / dt flows in one data drive integrated circuit instantaneously, and thus, the pattern as shown in (a) The data control unit 606 of FIG. 6 is electrically damaged when the data of the data is supplied to one specific data drive integrated circuit, for example, the data drive integrated circuit 701 of FIG. 7. Reorders the data as in (a).

(b) shows a data pattern in which the data control unit 606 of FIG. 6 readjusts the arrangement order.

In other words, the data is re-arranged so that most of the discharge cells have the same pattern as other adjacent discharge cells. The pattern of data such as (b) realigns the data pattern of (a) so that the off-cells 800 are located at the top of the screen and the on-cells 801 are located at the bottom of the screen. will be.

In the total equivalent capacitance of (b), a total of three data switching occurs in the vertical direction, so that an equivalent capacitance of 3Ca is formed, and no voltage difference occurs in the horizontal direction, so that no equivalent capacitance is formed. As a result, the total equivalent capacitance of (b) is 3Ca. Therefore, in the case of the data pattern of (b), the displacement current id calculated by the above equation (1) is 3Ca × dV / dt.

Accordingly, the magnitude of the displacement current generated in one data drive integrated circuit, for example, the data drive integrated circuit 701 of FIG. 7, is reduced by (6Ca + 8Cb) x dV / dt compared to the data pattern of (a). It is to prevent electrical damage of the data drive integrated circuit of 701.

In addition, the data pattern as shown in (a) is supplied only to the address electrode corresponding to the data drive integrated circuit 701 of FIG. 7, that is, the address electrode from the X ₁ address electrode to the X ₁₀ address electrode, and the other data drive integrated. Circuit, i.e., the data pattern supplied to the address electrode corresponding to the data drive integrated circuit from the data drive integrated circuit at 702 to the data drive integrated circuit at 705, that is, the address electrode from the X ₁₁ address electrode to the X ₅₀ address electrode. In the case of a general data pattern that does not generate excessive displacement current, the above-described displacement current calculation unit 605 of FIG. 6 respectively represents the displacement current of the data supplied to the address electrode X corresponding to each of these data drive integrated circuits. The operation is supplied to the data control unit 606.

Then, the data controller 606 determines that only the data drive integrated circuit 701 of FIG. 7 is affected by excessive displacement current, and thus the address electrode corresponding to the data drive integrated circuit 701, that is, the X ₁ address electrode. Data of the same pattern as (a) supplied to the address electrodes from the X ₁₀ address electrode to the same pattern as (b) is readjusted and supplied to the data drive integrated circuit of 701 of FIG.

Accordingly, the data drive integrated circuit 701 of FIG. 7 does not supply data having the same pattern as (a) to the address electrodes from the X ₁ address electrode to the X ₁₀ address electrode, and the arrangement order is adjusted with (b). Supply the same pattern of data. As a result, the data drive integrated circuit except for the data drive integrated circuit of 701, that is, the data drive integrated circuit of the code 702, from the data drive integrated circuit of the code 702 to the data drive integrated circuit of the symbol 705 is prevented while preventing electrical damage to the data drive integrated circuit of the symbol 701 of FIG. Normal data is supplied to the corresponding address electrode, that is, the address electrode from the X ₁₁ address electrode to the X ₅₀ address electrode to reduce image quality deterioration.

Next, FIG. 8B illustrates another method in which the data controller 606 of FIG. 6 adjusts data.

That is, when the displacement current calculation unit 605 detects a pattern of data as shown in (a), the data control unit as indicated by 606 causes the data of the pattern as shown in (a) to be all cells 801 as shown in (b). To be data.

In the data of the pattern as shown in (b), the total equivalent capacitance becomes zero because switching of data in the vertical direction or voltage difference in the horizontal direction does not occur. This prevents electrical damage to the data drive integrated circuit.

Next, FIG. 8C illustrates another method in which the data controller 606 of FIG. 6 adjusts data.

That is, when the displacement current calculation unit 605 detects a pattern of data as shown in (a), the data control unit as indicated by reference numeral 606 reads data of the pattern as shown in (a) as shown in (b). Make sure the data is as good as possible.

In the data of the pattern as shown in (b), the total equivalent capacitance becomes zero because switching of data in the vertical direction or voltage difference in the horizontal direction does not occur. This prevents electrical damage to the data drive integrated circuit.

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 appended 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 interpreted as being included in the scope of the present invention.

As described above in detail, the present invention adjusts the arrangement of data supplied to the address electrode corresponding to the data drive integrated circuit according to the magnitude of the displacement current of the data supplied to the address electrode corresponding to the data drive integrated circuit. In addition, the present invention has an effect of reducing deterioration of image quality while preventing electrical damage of the data drive integrated circuit.

Claims (4)

A plasma display panel including a plurality of address electrodes; A data driver including a plurality of data drive integrated circuits for supplying data to the plurality of address electrodes; And Data controlling the data driver to adjust data supplied to the address electrodes corresponding to the plurality of data drive integrated circuits according to displacement currents of the data supplied to the address electrodes corresponding to the plurality of data drive integrated circuits. Control unit; Plasma display device comprising a. The method of claim 1, The data control unit And rearranging the order of the data supplied to the corresponding address electrodes in the data drive integrated circuit in which the displacement current of the data supplied to the corresponding address electrodes among the plurality of data drive integrated circuits is equal to or greater than a predetermined threshold current. Plasma display device. The method of claim 1, The data control unit Cut off the supply of data to the corresponding address electrode in the data drive integrated circuit whose displacement current of the data supplied to the corresponding address electrode among the plurality of data drive integrated circuits is equal to or greater than a predetermined threshold current; Display device. The method of claim 1, The data control unit A plasma display apparatus supplying data to all the corresponding address electrodes in a data drive integrated circuit having a displacement current of data supplied to the corresponding address electrodes among the plurality of data drive integrated circuits equal to or greater than a predetermined threshold current; .

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