KR20000066315A - Method for driving plasma display panel - Google Patents

Abstract

PURPOSE: A method for driving a plasma display panel is provided to reduce a generation quantity of EMI(electromagnetic interference) without applying electric impact on a plasma display panel. CONSTITUTION: The method for driving a plasma display panel includes a reset step, address step, and a sustain discharge step. The reset step removes a residual wall charge in a previous sub field. The address step forms a wall charge in a selected pixel area. The sustain and discharge step applies AC pulse applied to a common electrode line and a scanning electrode line, and generates a light on the pixel on which wall charge is formed. The reset step, the address step, and the sustain discharge step are sequentially performed in a unit subfield. Thereby, the method for driving a plasma display panel reduces a generation quantity of EMI without applying electric impact on a plasma display panel.

Description

Driving method for plasma display panel {Method for driving plasma display panel}

The present invention relates to a method of driving a plasma display panel, and more particularly, to a method of driving a three-electrode surface discharge alternating current plasma display panel.

1 shows the structure of a typical three-electrode surface discharge AC plasma display panel. FIG. 2 illustrates an electrode line pattern of the plasma display panel of FIG. 1. FIG. 3 shows another example of one pixel of the panel of FIG. 1. Referring to the drawings, between the front and back glass substrates 10 and 13 of the general surface discharge plasma display panel 1, the address electrode lines A ₁ , A ₂ , A ₃ ,. .., Am _-2 , Am _-1 , Am), dielectric layer 11 and / or 141 of FIG. 3, scan electrode lines Y ₁ , Y ₂ , ..., Yn _-1 , Yn, common electrode Lines X ₁ , X ₂ ,..., Xn ₋₁ , Xn and a magnesium monoxide (MgO) layer 12 as a protective layer are provided.

The address electrode lines A ₁ , A ₂ , A ₃ ,..., Am- ₂ , Am- ₁ , Am are applied to the front surface of the back glass substrate 13 in a predetermined pattern. The phosphor 142 of FIG. 3 is applied to the front surface of the address electrode lines A ₁ , A ₂ , A ₃ ,..., Am ₋₂ , Am ₋₁ , Am, or the address electrode lines A _1. When the dielectric layer 141 (FIG. 3) is applied to the entire surface of A, A ₂ , A ₃ , ..., Am- ₂ , Am- ₁ , Am, the dielectric layer 141 may be applied on the dielectric layer 141.

The common electrode lines X ₁ , X ₂ ,..., Xn- ₁ , Xn and the scan electrode lines Y ₁ , Y ₂ , ..., Yn- ₁ , Yn are address electrode lines A. FIG. ₁ , A ₂ , A ₃ ,..., Am- ₂ , Am- ₁ , Am) so as to be orthogonal to the back surface of the front glass substrate 10. Each intersection point defines a corresponding pixel. Each common electrode line (X ₁ , X ₂ , ..., Xn _-1 , Xn) and each scan electrode line (Y ₁ , Y ₂ , ..., Yn _-1 , Yn) are indium tin oxide (ITO) It consists of electrode lines (Xna, Yna of FIG. 3) and bus electrode lines (Xnb, Ynb) made of metal. The dielectric layer 11 has a back surface of the common electrode lines X ₁ , X ₂ ,..., Xn- ₁ , Xn and the scan electrode lines Y ₁ , Y ₂ , ..., Yn- ₁ , Yn. It is formed by coating on the front. A magnesium monoxide (MgO) layer 12 for protecting the panel 1 from a strong electric field is formed by applying the entire surface to the back surface of the dielectric layer 11. The plasma forming gas is sealed in the discharge space 14.

The driving method basically applied to the plasma display panel is a method in which the reset, address, and sustain discharge steps are sequentially performed in the unit subfield. In the reset step, the remaining wall charges in the previous subfield are operated to be erased. In the addressing step, wall charges are formed in the selected pixel region. In the sustain discharge step, light is generated in the pixel on which the wall charge is formed in the address step. That is, relatively high between the common electrode lines (X ₁ , X ₂ , ..., Xn- ₁ , Xn) and the scan electrode lines (Y ₁ , Y ₂ , ..., Yn- ₁ , Yn) When an alternating pulse of voltage is applied, surface discharge is caused in the pixel on which wall charge is formed. At this time, a plasma is formed in the gas layer, and the phosphor 142 is excited by the ultraviolet radiation to generate light.

Here, since a plurality of unit subfields having the above basic operation principle are included in the unit frame, desired gray scale display may be performed by the sustain discharge time widths of each subfield.

In the sustain discharge step of the driving method of the plasma display panel 1 as described above, conventionally, when the AC pulses are applied to all the scan electrode lines Y ₁ , Y ₂ ,..., Y n _-1 , Y n. This constant is constant, and the time point at which the alternating pulses are applied to all common electrode lines X ₁ , X ₂ ,..., Xn ₋₁ , Xn is constant.

4 shows a conventional driving method. In FIG. 4, VX ₁ , ..., VX _{768 denote} a common electrode voltage, and VY ₁ , ..., VY ₇₆₈ denote a scan electrode voltage. In Figure 4, the prior art, sub-unit in the sustain discharge period in the field, the time of applying alternating current to a certain pulse to all the scan electrode lines _{(Y 1, Y 2, ...} , Y 768), and all The time point at which the AC pulses are applied to the common electrode lines X ₁ , X ₂ ,..., X ₇₆₈ is constant.

Accordingly, all the scan electrode lines Y ₁ , Y ₂ ,..., Yn ₋₁ , Yn or all common electrode lines X ₁ , X ₂ ,..., Xn ₋₁ , Since the total amount of driving current flowing at the time when an alternating pulse is applied to Xn) becomes large, an apparatus for applying an electric shock to the driving device (not shown) and the plasma display panel 1 and preventing it is required. In addition, the amount of electromagnetic interference waves is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a driving method in which the amount of generation of electromagnetic interference waves can be reduced without giving an electric shock to the driving device and the plasma display panel in the driving method of the plasma display panel.

1 is a view illustrating a structure of a typical three-electrode surface discharge alternating plasma display panel.

FIG. 2 is an electrode line pattern diagram of the plasma display panel of FIG. 1.

3 is a cross-sectional view illustrating an example of one pixel of the panel of FIG. 1.

4 is a timing diagram showing a conventional driving method.

5 is a timing diagram showing a driving method of a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10 ... front glass substrate, 11, 141 dielectric layer,

12.Magnesium monoxide layer, 13 back glass substrate,

14 ... discharge space, 142 ... phosphor,

X1, X2, ..., Xn- ₁ , Xn ... common electrode line,

Y1, Y2, ..., Yn _-1 , Yn, Y768 ... scan electrode line,

A1, A2, A3, ..., Am _-2 , Am _-1 , Am ... address electrode line,

Xna, Yna ... ITO electrode line, Xnb, Ynb ... bus electrode line,

1 ... plasma display panel, V _D ...

T1 ... phase difference,

VX ₁ , ..., VX ₇₆₈ ... common electrode voltage,

VY ₁ , ..., VY ₇₆₈ ... scanning electrode voltage.

The driving method of the present invention for achieving the above object comprises a reset step of erasing residual wall charges in the previous subfield; An address step of forming wall charges in the selected pixel region; And scan electrode lines (Y ₁ , Y ₂ ,..., Y n ₋₁ , Y n in FIG. 1) and common electrode lines (X ₁ , X ₂ ,. _-1 , Xn) by applying alternating-current pulses so that the sustain discharge step of generating light in the pixels in which the wall charges are formed in the address step is sequentially performed in the unit subfield (1 in FIG. 1). Is the driving method. In this method, the scan electrode lines Y ₁ , Y ₂ ,..., Y n ₋₁ , Y n and the common electrode lines X ₁ , X ₂ ,..., X n ₋₁ , X n are respectively Assigning the plurality of groups. In the sustain discharge step, the pulses to be applied in each group unit have a constant phase difference.

Accordingly, AC pulses are applied to the scan electrode lines Y ₁ , Y ₂ ,..., Y n ₋₁ , Y n or all common electrode lines X ₁ , X ₂ ,..., X n ₋₁ , X n. Since the amount of driving current flowing as a whole becomes very small at the time when is applied, the amount of generation of electromagnetic interference waves can be reduced without giving an electric shock to the driving device and the plasma display panel 1.

Hereinafter, preferred embodiments of the present invention will be described in detail.

5 shows a method of driving a plasma display panel according to the present invention. In FIG. 5, VX ₁ , ..., VX ₂₅₆ are the common electrode voltages of the first group, VX ₂₅₇ , ..., VX ₅₁₂ are the common electrode voltages of the second group, VX ₅₁₃ , ..., VX ₇₆₈ VY ₁ , ..., VY ₂₅₆ denotes the scan electrode voltage of the first group, VY ₂₅₇ , ..., VY ₅₁₂ denotes the scan electrode voltage of the second group, VY ₅₁₃ , ... VY ₇₆₈ denotes the scan electrode voltage of the third group, V _D denotes the sustain discharge voltage, and T1 denotes the phase difference. The driving method of FIG. 5 is applied to the case where the positive wall charges are formed on the common electrode of the pixels selected by performing the address step, and the negative wall charges are formed on the scan electrode.

Referring to FIG. 5, a total of 768 common electrode lines (X ₁ ,..., X ₇₆₈ ) may include a first group (X ₁ , ..., X ₂₅₆ ) and a second group (X ₂₅₇ , ...). , X ₅₁₂ ) and the third group (X ₅₁₃ , ..., X ₇₆₈ ). Similarly, a total of 768 scan electrode lines Y ₁ ,..., Y ₇₆₈ have a first group Y ₁ , ..., Y ₂₅₆ and a second group Y ₂₅₇ , ..., Y _512. ) And the third group (Y ₅₁₃ , ..., Y ₇₆₈ ). In this way, the common electrode lines X ₁ ,..., X ₇₆₈ and the scan electrode lines Y ₁ ,..., Y ₇₆₈ are divided into three, respectively, to set groups of 256 lines. In the sustain discharge cycle, the following sixth step driving method is applied.

1. First step;

Bipolar (+) pulses of the sustain discharge voltage V _D are simultaneously applied to the common electrode lines X ₁ ,..., X ₂₅₆ of the first group. Accordingly, the common electrode of the pixels selected from the pixels corresponding to the row electrode lines X ₁ ,..., X ₂₅₆ , Y _{1 ,.} A sustain discharge with a current direction of is performed.

2. second step;

When the time difference of the phase difference T1 flows from the time when the positive polarity pulse of the sustain discharge voltage V _D is simultaneously applied to the common electrode lines X ₁ , ..., X _{256 of} the first group, the common electrode of the second group Bipolar (+) pulses are simultaneously applied to the lines X ₂₅₇ , ..., X ₅₁₂ . Accordingly, the scan electrode from the common electrode of the selected pixel from the pixels corresponding to a second group of rows (行) of electrode lines _{(X 257, ..., X 512} , Y 257, ..., Y 512) A sustain discharge with a current direction of is performed.

3. third step;

If the time difference of the phase difference T1 flows from the time when the positive polarity pulse of the sustain discharge voltage V _D is simultaneously applied to the common electrode lines X ₂₅₇ , ..., X _{512 of} the second group, the common electrode of the third group A bipolar (+) pulse is applied simultaneously to the lines X ₅₁₃ , ..., X ₇₆₈ . Accordingly, the scan electrode from the common electrode of a selected pixel among the pixels corresponding to the third row group (行) of electrode lines _{(X 513, ..., X 768} , Y 513, ..., Y 768) A sustain discharge with a current direction of is performed.

4. fourth step;

When a predetermined time flows from the time when the positive polarity pulse of the sustain discharge voltage V _D is simultaneously applied to the common electrode lines X ₂₅₇ ,..., And X _{512 of} the third group, the scan electrode lines of the first group Bipolar (+) pulses are simultaneously applied to (Y ₁ , ..., Y ₂₅₆ ). Accordingly, the common electrode from the scanning electrode of the selected pixel from among the pixels corresponding to the first group line (行) of electrode lines _{(X 513, ..., X 768} , Y 513, ..., Y 768) A sustain discharge with a current direction of is performed.

5. fifth step;

When the time difference of the phase difference T1 flows from the time when the bipolar (+) pulse of the sustain discharge voltage V _D is simultaneously applied to the scan electrode lines Y ₁ , ..., Y _{256 of} the first group, the scan electrode of the second group Bipolar (+) pulses are simultaneously applied to the lines Y ₂₅₇ , ..., Y ₅₁₂ . Accordingly, the common electrode from the scanning electrode of the selected pixel from among the pixels corresponding to a second group of rows (行) of electrode lines _{(X 257, ..., X 512} , Y 257, ..., Y 512) A sustain discharge with a current direction of is performed.

6. sixth step;

When the time difference of the phase difference T1 passes from the time when the positive polarity pulse of the sustain discharge voltage V _D is simultaneously applied to the scan electrode lines Y ₂₅₇ ,..., And Y _{512 of} the second group, the scan electrode of the third group Bipolar (+) pulses are simultaneously applied to lines Y ₅₁₃ , ..., Y ₇₆₈ . Accordingly, the common electrode from the scanning electrode of the selected pixel from among the pixels corresponding to a group of three lines (行) of electrode lines _{(X 513, ..., X 768} , Y 513, ..., Y 768) A sustain discharge with a current direction of is performed.

As such, in the sustain discharge step, pulses to be applied in each group unit have a constant phase difference. As a result, the amount of driving current flowing as a whole decreases when the AC pulse is applied to the scan electrode lines or all the common electrode lines, thereby reducing the amount of electromagnetic interference waves without causing an electric shock to the driving device and the plasma display panel. have.

The first to sixth steps are performed once in a unit period of the positive pulse. In addition, the first to sixth steps are continuously performed until the sustain discharge cycle determined by the gray scale ends.

As described above, according to the driving method of the plasma display panel according to the present invention, in the sustain discharge step, pulses to be applied in each group unit have a constant phase difference. As a result, the amount of driving current flowing as a whole decreases when the AC pulse is applied to the scan electrode lines or all the common electrode lines, thereby reducing the amount of electromagnetic interference waves without causing an electric shock to the driving device and the plasma display panel. have.

The present invention is not limited to the above embodiments, but may be modified and improved by those skilled in the art within the spirit and scope of the invention as defined in the claims.

Claims (3)

A reset step of erasing residual wall charges in the previous subfield; An address step of forming wall charges in the selected pixel region; And applying alternating pulses to the scan electrode lines and the common electrode lines arranged in parallel with each other so that the sustain discharge step of generating light in the pixels in which the wall charges are formed in the address step is sequentially performed in the unit subfield. In the method of driving a plasma display panel, Allocating the scan electrode lines and the common electrode lines into a plurality of groups, respectively; And In the sustain discharge step, causing the pulses to be applied in each group unit to have a constant phase difference. A reset step of erasing residual wall charges in the previous subfield; An address step of forming wall charges in the selected pixel region; And applying alternating pulses to the scan electrode lines and the common electrode lines arranged in parallel with each other so that the sustain discharge step of generating light in the pixels in which the wall charges are formed in the address step is sequentially performed in the unit subfield. In the method of driving a plasma display panel, (a) assigning the scan electrode lines to at least a first group and a second group; (b) assigning the common electrode lines to at least a first group and a second group; (c) in the sustain discharge step, applying one pulse to all common electrode lines of the first group; (d) if step (c) is performed, applying one pulse to all common electrode lines of the second group; (e) if step (d) is performed, applying one pulse to all scan electrode lines of the first group; (f) if step (e) is performed, applying one pulse to all scan electrode lines of the second group; And (g) repeating the steps (c), (d), (e) and (f) until the sustain discharge step is completed. The method of claim 1, And the steps (c), (d), (e) and (f) are performed once within the unit period of the pulse.