KR20000056897A - Method for driving plasma display panel - Google Patents

Abstract

PURPOSE: A method for driving a plasma display panel is provided to reduce the amount of generation of electromagnetic interference waves. CONSTITUTION: A method for driving a plasma display panel is constructed in such a manner that a reset step of erasing remaining wall charges from the previous sub-field, an address step of forming wall charges in a selective pixel region, and a sustain discharging step of applying AC pulses to scanning electrode lines and common electrode lines arranged in parallel with each other, to allow the pixel in which the wall charges are formed to generate light are sequentially performed in a unit sub-field. In the sustain discharging step, a single pulse is simultaneously applied to even-numbered scanning electrode lines and odd-numbered common electrode lines. Upon completion of application of the pulse to the even-numbered scanning electrodes lines and odd-numbered common electrode lines, a single pulse is simultaneously provided to odd-numbered scanning electrode lines and even-numbered common electrode lines. These two steps are repeatedly carried out.

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 entire surface of the scan electrode lines Y ₁ , Y ₂ ,..., Y n ₋₁ , Y n, or the scan electrode lines Y ₁ , Y ₂ ,. In the case where the dielectric layer 141 (FIG. 3) is applied to the entire surface of Yn ₋₁ and Yn, the dielectric layer 141 may be coated 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.

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 direction of the driving current which flows as a whole when the AC pulse is applied to Xn) is the same, the magnetic force becomes stronger and the quantity of generation of electromagnetic interference waves increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a driving method capable of reducing the amount of electromagnetic interference waves in a plasma display panel driving method.

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 illustrating a method of driving a plasma display panel according to an exemplary embodiment of the present invention.

5 and 6 are timing diagrams for describing the driving method of FIG. 4.

FIG. 7 is a diagram for describing current flow by the driving method of FIG. 4.

FIG. 8 is a layout view of electrode lines for easily realizing the driving method of FIG. 4.

<Explanation of symbols for main parts 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, 21 ...

VA ... address voltage, V _R1 ... first reset voltage,

V _AX ... common address voltage, V _AY ... scan address voltage,

V _D ... Dielectric voltage, V _R2 ... Second reset voltage,

VA ₁ , ..., VAm ... address electrode line voltage,

VX _even ... common electrode line voltage,

VY _Even ... Even scan electrode line voltage,

VX _odd ... odd common electrode line voltage,

VY _odd ... odd scan electrode line voltage,

ID _odd ... odd row electrode line current,

ID _Even ... Even row electrode line current,

+ I ... positive row electrode line current, -I ... negative row electrode line current.

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 the sustain discharge step, one pulse is applied to even-numbered lines (Y ₂ , Y ₄ ,..., Y n _-2 , Y n) among the scan electrode lines, and an odd number of the common electrode lines is applied. Step (a) of applying a pulse to the lines X ₁ , X ₃ ,..., Xn ₋₃ , Xn ₋₁ is included. When the step (a) is performed, one pulse is applied to odd-numbered lines Y ₁ , Y ₃ ,..., Y n _-3 , Y n _-1 among the scan electrode lines, and the common electrode line Among them, one pulse is applied to even-numbered lines X ₂ , X ₄ ,..., Xn ₋₂ , Xn (step b). Steps (a) and (b) are repeated.

Accordingly, the row electrode lines adjacent to each of the row electrode lines Y ₁ , Y ₂ , ..., Yn- ₁ , Yn, X ₁ , X ₂ , ..., Xn _-1 , Xn Since currents flow in opposite directions to each other, the magnetic force becomes weaker and the amount of electromagnetic interference waves is reduced.

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

4 illustrates a method of driving a plasma display panel according to an exemplary embodiment of the present invention. 5 and 6 are timing diagrams for describing the driving method of FIG. 4. 7 shows a current flow by the driving method of FIG. 4, 5, 6 and 7, reference numeral VA denotes an address voltage, V _R1 denotes a first reset voltage, V _AX denotes a common address voltage, V _AY denotes a scan address voltage, V _D denotes a sustain discharge voltage, and V _R2 denotes a 2 Reset voltage, VA ₁ , ..., VAm is address electrode line voltage, VX _even is common electrode line voltage, VY _even is even scan electrode line voltage, VX _odd is odd common electrode line voltage, VY _odd refers to the odd-numbered scan electrode lines voltage, ID is _{an odd} numbered row electrode line current, ID is _{an even} numbered row electrode line current, I + is the positive row electrode line current, and -I are negative row electrode line current .

4, 5, 6 and 7, in the first period (R ₂ -R ₃ of FIG. 4) within the reset period (R ₁ -A ₁ of FIG. 4), even-numbered scan electrode lines Y ₂ , Pulses of the first reset voltage V _{R1 at} Y ₄ ,..., Yn- ₂ , Yn) and odd-numbered common electrode lines X ₁ , X ₃ , ..., Xn- ₃ , Xn _-1 . Is applied. The reason is that the negative wall charges are formed on the scan electrodes of the even pixels and the common electrodes of the odd pixels among the pixels selected in the previous subfield, and the scan electrodes and the even pixels of the odd pixels are formed. Since bipolar (+) wall charges are formed in the common electrode (see the last point of the sustain discharge cycle in FIG. 6), this is to more integrate these wall charges. The reset period shown in FIG. 6 is a state in which the sections R ₁ -R ₃ and R ₄ -R ₅ shown in FIG. ₄ are omitted.

In the second period R _3- R ₄ in the reset period R _1- A ₁ , even-numbered common electrode lines X ₂ , X ₄ ,..., Xn- ₂ , Xn and odd-numbered scan electrodes A narrow pulse of the second reset voltage V _R2 is applied to the lines Y ₁ , Y ₃ ,..., Y n _-3 , Y n _-1 . Accordingly, even-numbered scan electrode lines Y ₂ , Y ₄ ,..., Yn- ₂ , Yn from even-numbered common electrode lines X ₂ , X ₄ ,..., Xn- ₂ , Xn. Narrow discharge with positive current (+ I) direction of the furnace is performed. At the same time, odd-numbered common electrode lines X ₁ , X ₃ , ..., Xn- ₃ , from odd-numbered scan electrode lines Y ₁ , Y ₃ , ..., Yn- ₃ , Yn- ₁ Narrow discharge with negative current (-I) direction to Xn _-1 is performed. This narrow discharge eliminates most of the wall charges.

In the third section R ₄ -R ₅ in the reset period R ₁ -A ₁ , the even-numbered scan electrode lines Y ₂ , Y ₄ ,..., Yn- ₂ , Yn and the odd-numbered common electrode A pulse of the first reset voltage V _R1 is applied to the lines X ₁ , X ₃ ,..., Xn- ₃ , Xn _-1 . Accordingly, the even-numbered scan electrode lines _{(Y 2, Y 4, ...} , Yn -2, Yn) and the odd-numbered common electrode lines _{(X 1, X 3, ...} , Xn -3, Xn - ₁ ) The negative (-) wall charges remaining around can be completely erased.

In the address period A ₁ -S ₁ of FIG. 4, the common address voltage V _AX is continuously applied to all common electrode lines X ₁ , X ₂ ,..., Xn- ₁ , Xn. The address electrode line A _{1 to} which the address voltage VA is applied while the scan address voltage V _AY is applied to all the scan electrode lines Y ₁ , Y ₂ ,..., Y n ₋₁ , Y n. Or 0 volts [V] is applied to the scan electrode line Y ₁ or Y ₂ or ... or Yn corresponding to A ₂ or. Accordingly, negative wall charges are formed in the scan electrode region of the selected pixels, and positive wall charges are formed in the address electrode region.

The sustain discharge period (S ₁ -Si in FIG. 4) is set by the gray-scale value of the corresponding sub-field. In the _first period S ₂ -S ₃ within the sustain discharge period S ₁ -Si, even-numbered scan electrode lines Y ₂ , Y ₄ ,..., Yn- ₂ , Yn and an odd-numbered common electrode The sustain discharge voltage V _D is simultaneously applied to the lines X ₁ , X ₃ ,..., Xn ₋₃ , Xn ₋₁ . Before the sustain discharge voltage V _D is applied, positive (+) wall charges are formed around the scan electrodes of the selected pixels, and negative (-) wall charges are formed around the common electrode (Fig. 5). S ₁ -S ₂ section). Accordingly, while the sustain discharge is performed in the direction of the common electrode region from the scan electrode regions of the even pixels among the selected pixels, the positive row electrode line current + I from the row driver 21 flows (FIGS. 5 and 7). Reference). However, since the negative (−) wall charges are formed in the common electrode region of the selected pixels before the sustain discharge voltage V _D is applied, sustain discharge does not occur in odd pixels among the selected pixels. Only negative wall charges and odd scan electrode lines Y around the odd common electrode lines X ₁ , X ₃ ,..., Xn ₋₃ , Xn ₋₁ of the selected pixels are provided. _Only positive polarity (+) wall charges are settled around ₁ , Y ₃ ,..., Yn _-3 , Yn _-1 (see S ₃ -S _{4 in} FIG. 5).

In the second period S ₄ -S ₅ within the sustain discharge period S ₁ -Si, even-numbered common electrode lines X ₂ , X ₄ ,..., Xn- ₂ , Xn and odd-numbered scan electrodes The sustain discharge voltage V _D is simultaneously applied to the lines Y ₁ , Y ₃ ,..., Y n _-3 , Y n _-1 . Before this sustain discharge voltage V _D is applied, bipolar (+) wall charges are formed around the common electrode of even-numbered pixels and around the scan electrode of odd-numbered pixels among the selected pixels (S _{3 in} FIG. 5). -S section ₄ ). Accordingly, while the sustain discharge is performed in the direction of the scan electrode region from the common electrode regions of the even pixels among the selected pixels, the negative row electrode line current (-I) flows from the row driver 21. At the same time, while the sustain discharge is performed in the direction of the common electrode region from the scan electrode regions of the odd pixels among the selected pixels, the positive row electrode line current (+ I) from the row driver 21 flows (FIGS. 5 and 7). Reference).

In the third period S ₆ -S ₇ in the sustain discharge period S ₁ -Si, odd-numbered common electrode lines X ₁ , X ₃ , ..., Xn _-3 , Xn _-1 and even-numbered The sustain discharge voltage V _D is simultaneously applied to the scan electrode lines Y ₂ , Y ₄ ,..., Y n ₋₂ , Y n. Before this sustain discharge voltage V _D is applied, bipolar (+) wall charges are formed around the common electrode of the odd pixels and around the scan electrode of the even pixels among the selected pixels (S _{5 in} FIG. 5). -S section ₆ ). Accordingly, while the sustain discharge is performed in the direction of the scan electrode region from the common electrode region of the odd-numbered pixels among the selected pixels, the negative row electrode line current (-I) flows from the row driver 21. At the same time, while the sustain discharge is performed in the direction of the common electrode region from the scan electrode regions of the even pixels among the selected pixels, the positive row electrode line current (+ I) from the row driver 21 flows (FIGS. 5 and 7). Reference).

The above steps are repeated until the sustain discharge period S ₁ -Si in the unit subfield is completed. For example, referring to FIG. 5, the driving method of the fourth section S ₈ -S ₉ and the sixth section S ₁₂ -S _{13 in the} sustain discharge period S ₁ -Si is the second section described above. Same as (S ₄ -S ₅ ). In addition, the driving method of the fifth section S ₁₀ -S ₁₁ and the sixth section S ₁₄ -S ₁₅ is the same as the third section S ₆ -S ₇ .

As such, each of the row electrode lines Y ₁ , Y ₂ ,..., Yn- ₁ , Yn, X ₁ , X ₂ , ..., Xn- ₁ , Xn is adjacent to the row electrode lines. Since currents (+ I, -I) in opposite directions flow, the magnetic force becomes weaker and the amount of electromagnetic interference waves is reduced.

8 illustrates an arrangement state of electrode lines in which the driving method of FIG. 4 may be easily realized. 8, the even-numbered common electrode lines _{(X 2, X 4, ...} , X 10) and the odd-th scan electrode lines _{(Y 1, Y 3, ...} , Y 11) are the conventional The scan electrode lines are drawn out to the positions of Y ₁ , Y ₂ ,..., Y ₁₁ in FIG. 7. In addition, odd-numbered common electrode lines X ₁ , X ₃ ,..., X ₁₁ and even-numbered scan electrode lines Y ₂ , Y ₄ , ..., Y ₁₀ are conventional common electrode lines. (Fig. _{7 X 1, X 2, ...} , X 11) it is drawn out to a position. By applying such a structure, the driving method of this embodiment can be realized as it is without changing the conventional driving circuit. That is, even-numbered common electrode lines X ₂ , X ₄ ,..., X ₁₀ and odd-numbered scan electrode lines Y ₁ , Y ₃ , ..., Y ₁₁ are conventional scan electrode lines. Considering (Y ₁ , Y ₂ ,..., Y _{11 in} FIG. 7), the driving method of this embodiment can be realized by applying a conventional driving circuit as it is. Also, the odd-numbered common electrode lines _{(X 1, X 3, ...} , X 11) and the even-numbered scan electrode lines _{(Y 2, Y 4, ...} , Y 10) of the conventional common electrode line Considering (X ₁ , X ₂ , ..., X _{11 in} FIG. 7), the driving method of the present embodiment can be realized by applying a conventional driving circuit as it is.

As described above, according to the driving method of the plasma display panel according to the present invention, each row electrode line Y ₁ , Y ₂ ,..., Y n _-1 , Y n, X ₁ , X ₂ , ... , Xn _-1 , Xn flows currents (+ I, -I) in opposite directions with respect to adjacent row electrode lines, so that the magnetic force becomes weaker and the amount of electromagnetic interference waves is reduced. In addition, with a simple design change, the driving method of this embodiment can be realized by applying the conventional driving circuit as it is.

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 (1)

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, In the sustain discharge step, (a) applying one pulse to even lines among the scan electrode lines and one pulse to odd lines among the common electrode lines; (b) when step (a) is performed, applying one pulse to odd-numbered lines among the scan electrode lines and applying one pulse to even-numbered lines among the common electrode lines; And (c) A driving method comprising the step of repeating the steps (a) and (b).