KR20060094311A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a display device comprising: a first panel including a plurality of first discharge electrodes; a second panel disposed in a direction crossing the second discharge electrode; and a second panel disposed between the first and second panels; And a red, green, and blue phosphor layer applied in the discharge cell, wherein the height H ₁ of the barrier layer and the applied height H ₂ of the phosphor layer are 0.78 ≦ H ₂ / H ₁ ≦ 0.97. In order to satisfy the above, erroneous discharge is not generated by limiting the height of the partition wall, the height to which the phosphor layer is coated, the distance between the M electrode and the address electrode, and the height to which the phosphor layer is coated by a specific formula.

Description

Plasma display panel {Plasma display panel}

1 is a cross-sectional view showing a conventional plasma display panel;

2 is a block diagram of a plasma display device according to an embodiment of the present invention;

FIG. 3 is an exploded perspective view illustrating a portion of the plasma display panel of FIG. 2;

4 is a cross-sectional view taken along the line II of FIG. 3;

5 is a waveform diagram of signals applied to the electrode line of FIG. 3;

6 to 8 illustrate changes in the wall charge distribution of FIG. 5.

6 is a cross-sectional view showing the wall charge distribution during the wall charge erase time;

7 is a cross-sectional view showing the wall charge distribution before address discharge after reset;

Fig. 8 is a sectional view showing the wall charge distribution at the time of address discharge.

<Brief description of symbols for the main parts of the drawings>

300 ... plasma display panel 310 ... front panel

311 ... Front board 312 ... X electrode

313 ... Y electrode 314 ... M electrode

315 ... Front dielectric layer 316 ... Protective layer

360 ... back panel 361 ... back board

362 ... address electrode 363 ... backside dielectric layer

364 Bulkhead 365 Phosphor Layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel. The present invention relates to a plasma display panel in which the distance between the discharge electrodes, the partition walls, and the height of the phosphor layer are defined by a specific formula in order to prevent erroneous discharge during addressing in the multi-electrode structure.

In general, a plasma display panel injects and discharges a discharge gas between two substrates on which a plurality of discharge electrodes are formed, and excites the fluorescent material of the phosphor layer by the generated ultraviolet rays, thereby causing desired numbers and letters. Or a flat display device for implementing graphics.

Such a plasma display panel may be classified into a direct current type and an alternating current type according to a type of driving voltage applied to a discharge cell, for example, a discharge type, and may be classified into a counter discharge type and a surface discharge type according to the configuration of the electrodes.

Referring to FIG. 1, the conventional three-electrode surface discharge plasma display panel 100 is alternately disposed on the front substrate 110, a rear substrate 120 disposed in parallel with the front substrate 110, and an inner surface of the front substrate 110. The X and Y electrodes 131 and 132, the front dielectric layer 140 filling the X and Y electrodes 131 and 132, and the protective layer 150 deposited on the surface of the front dielectric layer 140. And an address electrode 160 formed on an inner surface of the back substrate 120 and disposed in a direction crossing the X and Y electrodes 131 and 132, and a back dielectric layer filling the address electrode 160. And a partition wall 180 disposed on the rear dielectric layer 170, and a red, green, and blue phosphor layer 190 applied to the inner side of the partition wall 180.

The operation of the plasma display panel 100 having the above structure will be briefly described. After applying an electrical signal to the Y electrode 132 and the address electrode 160 to select a discharge cell, the X and Y electrodes 131 ( By alternately applying an electrical signal to the surface 132, surface discharge occurs from the surface of the front substrate 110 to generate ultraviolet rays, and visible light is emitted from the phosphor layer 190 of the selected discharge cell, thereby realizing a still image or a moving image. .

In recent years, as the flat panel display becomes larger, a plasma display panel adopts a multi-electrode structure with a discharge electrode to which a separate voltage is applied to the discharge gap between the display discharge sustain electrodes, thereby providing a long gap discharge between the discharge sustain electrode pairs. A structure that can improve luminance by generating long gap discharge is under research and development. At this time, it is required to design the gap between the discharge electrodes and the height of the partition wall and the phosphor layer to have a specific numerical value so that discharge at the time of addressing is properly generated.

An object of the present invention is to provide a plasma display panel which prevents mis-discharge of an address by limiting the height of a partition and the height of a phosphor layer in a multi-electrode structure to a specific formula.

Another object of the present invention is to provide an M electrode between the X and Y electrodes which are display sustain discharge electrodes, and to limit the distance between the M electrode and the address electrode and the height of the phosphor layer by a specific formula to prevent address mis-discharge. To provide a panel.

In order to achieve the above object, the plasma display panel according to an aspect of the present invention,

A first panel on which a plurality of first discharge electrodes are disposed;

A second panel disposed in a direction crossing the first discharge electrode and having a second discharge electrode disposed therein;

A partition wall disposed between the first and second panels to define a discharge cell;

And a red, green, and blue phosphor layer coated in the discharge cell.

The height of the barrier rib and the coated height of the phosphor layer satisfy the following Equation 1.

<Equation 1>

0.78 ≤ H ₂ / H ₁ ≤ 0.97

Here, H ₁ is the height of the partition wall, H ₂ is the height of the phosphor layer.

The first discharge electrode may include an X electrode disposed alternately along one direction of the front panel, a Y electrode, and an M electrode disposed in a discharge gap between the X and Y electrodes, and the second discharge electrode. Is an address electrode addressed to the Y electrode.

In addition, the height of the partition and the distance between the M electrode and the Y electrode is characterized by satisfying the following equation (2).

<Equation 2>

1.25 ≤ H ₂ / G ≤ 1.55

Here, H ₂ is the height of the partition wall, G is the gap between the M electrode and the Y electrode.

Further, the M electrode is characterized by consisting of a transparent electrode line and a bus electrode line superimposed on the transparent electrode line.

In addition, the transparent electrode line is characterized in that the width is formed relatively wider than the bus electrode line.

Further, the width of the M electrode is characterized in that formed relatively narrower than the width of the X and Y electrodes.

In addition, a trigger discharge voltage is applied between the X and M electrodes, and a sustain discharge voltage is applied between the X and Y electrodes.

Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a plasma display assembly 200 employing a four-electrode surface discharge plasma display panel 300 according to an embodiment of the present invention.

Referring to the drawings, the plasma display assembly 200 includes a plasma display panel 300, an image processor 201, a logic controller 202, an address driver 203, an X driver 204, The Y driver 205 and the M driver 206 are included.

The image processor 201 processes an external image signal to generate an internal image signal including red, green, and blue digital image data, a clock signal, and vertical and horizontal synchronization signals. The logic controller 202 generates drive-control signals S _M , S _A , S _X , S _Y in accordance with an internal image signal from the image processor 201.

The address driver 203 processes the address signals S _A from the logic controller 202 to generate display data signals, and generates the display data signals to the address electrode lines A ₁ ,. To apply.

The X driver 204 operates from the logic controller 202 according to the X drive-control signal S _{X to} drive the X electrode lines X ₁ ,..., Xm. The Y driver 205 operates from the logic controller 202 according to the Y drive-control signal S _{Y to} drive the Y electrode lines Y ₁ ,..., Y n. The M driver 206 operates from the logic controller 202 according to the M drive-control signal S _{M to} drive the M electrode lines M ₁ ,..., Mn. Wherein, M electrode lines (M _1, ..., Mn) is applied to the scan pulse in each sequence as soon at the same time the address electrode lines (A _1, ..., Am) are addressed in the data pulses to the selected address electrode lines This is done.

Then, the discharge cell selected by addressing to display - to cause a sustain discharge all X electrode lines (X _1, ..., Xm) and the AC voltage is applied between all the Y electrode lines (Y _1, ..., Yn) Is applied.

Accordingly, the discharge cells can be set by all X and Y electrode line pairs.

In addition, a wall charge state necessary for display-holding discharge is formed for both the X and Y electrodes of the discharge cells selected by the addressing, and at least one of the X and Y electrodes of the unselected discharge cells is required for display-holding discharge. No charge state is formed.

For example, in four M electrode lines arranged in series, if there are two unselected discharge cells between two selected discharge cells, display-maintained discharge at either of the X and Y electrodes of each of the two unselected discharge cells. The wall charge state necessary for Therefore, while the discharge cells are set by all the X and Y electrode lines, a progressive driving method can be applied.

FIG. 3 illustrates the four-electrode surface discharge plasma display panel 300 of FIG. 2.

Referring to the drawings, the plasma display panel 300 includes a front panel 310 and a back panel 360 coupled to the front panel 310. On the opposite inner edges of the front and rear panels 310 and 360, frit glass is applied to seal them to form a discharge space.

The front panel 310 is provided with a transparent substrate, such as a front substrate 311 such as soda lime glass. X and Y electrodes 312 and 313 are disposed on the inner surface of the front substrate 311.

The X and Y electrodes 312 and 313 are arranged in a strip shape along the X direction of the panel 300, and are arranged in pairs to face each other in the unit discharge cell. The X electrode 312 is composed of a first transparent electrode line 312a and a first bus electrode line 312b disposed along one edge of the surface of the first transparent electrode line 312a, and the Y electrode 313 includes a second transparent electrode line 313a and a second bus electrode line 313b disposed along one edge of the surface of the second transparent electrode line 313a.

At this time, an M electrode 314, which is another discharge electrode, is disposed between the pair of X and Y electrodes 312 and 313 to induce their long gap discharge. The M electrode 314 is disposed in parallel with the X and Y electrodes 312 and 313. The M electrode 314 includes a third transparent electrode line 314a and a third bus electrode line 314b disposed along the center of the surface of the third transparent electrode line 314a. The M electrode 314 is strip-like like the X and Y electrodes 312 and 313, and a discharge voltage different from that of the X and Y electrodes 312 and 313 is applied.

The X and Y electrodes 312 and 313, and the M electrodes 314 disposed therebetween, are in any shape or structure as long as they are arranged in each unit discharge cell to start discharge from the discharge gap. It is not limited.

The first to third transparent electrode lines 312a to 314a are made of a transparent conductive film, for example, an indium tin oxide film (ITO), and the first to third bus electrode lines 312b to 314b have excellent conductivity. It is preferably made of a metal material, for example silver paste.

In addition, the first to third transparent electrode lines 312a to 314a may be formed to have a relatively wider width than the first to third bus electrode lines 312b to 314b. The first to third bus electrode lines 312b to 314b are formed to reduce the line resistance of the first to third transparent electrodes 312a to 314a. The first to third bus electrode lines 312b to 314b may be formed to reduce the line resistance of the front panel 310. It is formed by making the width relatively narrower than the 1st-3rd transparent electrodes 312a-314a. In addition, the overall width of the M electrode 314 is formed to be relatively narrower than the width of the X and Y electrodes (312) (313).

The X and Y electrodes 312 and 313 and the M electrode 314 are embedded by the front dielectric layer 315. The front dielectric layer 315 is printed on the front substrate 311 using a transparent dielectric such as high dielectric material such as PbO-B ₂ O ₃ -SiO ₂ . Alternatively, the front dielectric layer 315 may be selectively applied only to portions where the X and Y electrodes 312 and 313 and the M electrode 314 are patterned.

A passivation layer 316 made of magnesium oxide (MgO) is formed on the surface of the front dielectric layer 315 to increase secondary electron emission. The passivation layer 316 is entirely deposited on the surface of the front dielectric layer 315.

The back panel 360 is provided with a back substrate 361 made of a transparent glass substrate, for example, soda lime glass. The rear substrate 361 is disposed to face the front substrate 311.

An address electrode 362 is formed on the inner surface of the back substrate 361. The address electrode 362 has a strip shape and is disposed in a direction crossing the X and Y electrodes 312 and 313. The address electrode 362 extends across discharge cells disposed adjacent to the Y direction of the panel 300. The address electrode 362 is made of a metal material having excellent conductivity, such as silver paste.

The address electrode 362 is embedded by the back dielectric layer 363. The back dielectric layer 363 is made of a highly dielectric material like the front dielectric layer 316.

A partition 364 is disposed between the front and rear panels 310 and 360. The partition 364 may include a first partition 364a disposed in a direction orthogonal to a direction in which the address electrode 362 is disposed, and a second partition wall disposed in a direction parallel to the direction in which the address electrode 362 is disposed ( 364b). The second partition 364b extends in a direction opposite from the inner side walls of the pair of adjacent first partitions 364a to define a discharge cell.

The first and second barrier ribs 364a and 364b are integrally coupled, and the divided discharge cells are matrix type. Alternatively, the partition 364 may be manufactured in various shapes such as a waffle type, meander type, delta type, or stripe type. Unit discharge cells may also be described in various embodiments, such as circular, square, triangular, elliptical, hexagonal.

On the other hand, red, green, and blue phosphor layers 365 are coated on the inner wall of the partition 364 and the upper surface of the back dielectric layer 363 for each discharge cell. In addition, a discharge gas of neon (Ne) -xenon (Xe) is injected into the discharge space defined by the front and rear panels 310 and 360 and the partition 364.

Here, the height of the partition 364, the coating height of the phosphor layer 365, and the interval between the M electrode 314 and the address electrode 362 are defined by a specific relational expression.

In more detail, as described with reference to FIG.

4 is a cutaway view taken along the line II of FIG. 3.

Referring to the drawing, in the plasma display panel 300, a partition 364 is disposed between the front panel 310 and the rear panel 360 to define a discharge cell. In one discharge cell, an X electrode 312, a Y electrode 313, and an M electrode 314 disposed between the X electrode 312 and the Y electrode 313 are disposed on an inner surface of the front substrate 311. The address electrodes 362 are arranged on the inner surface of the back substrate 361 in the direction crossing them.

Further, in the partition 364, red, green, and blue phosphor layers 365 that are excited by ultraviolet rays generated from the discharge gas and emit visible light are coated. The phosphor layer 365 is coated on both the sidewall of the partition 364 and the top surface of the back dielectric layer 363. At this time, the red phosphor layer is made of (Y, Gd) BO ₃ ; Eu ⁺³ , the green phosphor layer is made of Zn ₂ SiO ₄ : Mn ²⁺ , and the blue phosphor layer is BaMgAl ₁₀ O ₁₇ : Eu It is preferable that it ^consists of ²⁺ .

In this case, the height H ₁ of the partition 364 and the applied height H ₂ of the phosphor layer 365 satisfy the following Equation 1.

<Equation 1>

0.78 ≤ H ₂ / H ₁ ≤ 0.97

Here, H ₁ is the height of the partition 364, H ₂ is the height of the phosphor layer 365.

In addition, the height H ₁ of the partition 364 and the gap G between the Y electrode 313 and the M electrode 314 satisfy the following equation (2).

<Equation 2>

1.25 ≤ H ₂ / G ≤ 1.55

Here, H ₁ is the height of the partition 364, G is the interval between the Y electrode 313 and the M electrode 314.

Hereinafter, the operation of the 4-electrode surface discharge plasma display panel 300 according to an embodiment of the present invention will be described.

5 illustrates a signal applied to an electrode line of the plasma display panel 300 of FIG. 4, and FIGS. 6 to 8 illustrate changes in wall charge distribution of unit discharge cells with time.

5 and 6, at the resetting time of the unit subfield, weak discharges are generated between the electrodes of all the discharge cells, and wall charges of all the discharge cells are erased.

5 and 7, the wall charge state before the address discharge after reset causes a weak discharge between the electrodes of all the discharge cells, and increases the negative wall charges (−) around the M electrode 314. Positive wall charges (+) are formed around the address electrode 362. In addition, negative wall charges (−) accumulate around the X electrode 312, and positive wall charges (+) increase around the Y electrode 313.

5 and 8, in the wall charge state during address discharge, a positive wall charge (+) is formed around the M electrode 314 of the selected discharge cell due to the addressing discharge, and the address electrode ( A negative wall charge (-) is formed around the 362. In addition, a negative wall charge (-) is formed around the X electrode 312 of the selected discharge cell, and a positive wall charge (+) is formed around the Y electrode 313.

Subsequently, a long gap discharge occurs in the X electrode 312 and the Y electrode 313 after the trigger discharge between the X electrode 312 and the M electrode 313 of the discharge cell selected by the address discharge.

At this time, when the wall charge between the address electrode 362 and the M electrode 314 changes at the time of address discharge, the negative wall charge (−) moved to the address electrode 362 is applied to the partition 364 (see FIG. 4). The formed phosphor layer 365 is also affected, and a negative wall charge (−) is formed on the surface of the phosphor layer 365.

If the height of the phosphor layer 365 is applied is substantially the same as the height of the partition 364, the phosphor layer having the negative wall charge (−) is formed while the distance between the Y electrodes 313 is close to each other. 365 easily causes a discharge with the Y electrode 313 on which the positive wall charge (+) is formed, so that the secondary Y electrode 313 and the address electrode 362 are discharged. As a result, much of the positive wall charge (+) to be accumulated on the Y electrode 313 is erased.

As a result, a long gap discharge should occur at the X and Y electrodes 312 and 313 after the trigger discharge between the X electrode 312 and the M electrode 313 during display sustain discharge, but the positive polarity at the Y electrode 313 The wall charge (+) is not sufficient, so no long gap discharge occurs between the X and Y electrodes 312 and 313.

On the other hand, the height (H _1), and a phosphor layer 365, the height of the coating (H ₂₎ of the partition wall 364 in accordance with aspects of the present invention satisfy the <Equation 1>, and of the partition (364) The height H ₁ and the distance G between the Y electrode 313 and the M electrode 314 satisfy the expression (2), than the conventional case, the phosphor layer 365 and the Y electrode 313. Since the distance between the two electrodes increases, the positive wall charges (+) to be accumulated on the Y electrode 313 are hardly erased. As a result, no erroneous discharge occurs.

Hereinafter, the results of the partition wall, the relative height change of the phosphor layer, the distance between the address electrode and the M electrode, and the relative height change of the phosphor layer according to the applicant's experiment are shown in Table 1.

TABLE 1

MY electrode spacing Height of bulkhead Height of phosphor layer Number of false discharge cells Comparative Example 1 75 120 120 9 Comparative Example 2 118 5 Example 1 116 0 Example 2 114 0 Example 3 112 0 Example 4 110 0 Example 5 108 0 Example 6 106 0 Example 7 104 0 Example 8 102 0 Example 9 100 0 Example 10 98 0 Example 11 96 0 Example 12 94 0

(Unit: μm)

Referring to Table 1, the height of the partition wall is fixed at 120 micrometers, the distance between the M electrode and the address electrode is fixed at 75 micrometers, respectively, and the height of the phosphor layer is 2 micrometers from 120 micrometers to 94 micrometers. In short, the number of false positive discharge cells was measured.

In the case of the comparative example 1 and the comparative example 2, when the height of a partition was 120 micrometers, when the height of the fluorescent substance layer was changed to 120 and 118 micrometers, the number of erroneous discharge discharge cells was 9 and 5, respectively.

On the other hand, in Examples 1 to 12, when the height of the partition wall is 120 micrometers, the height of the phosphor layer is 116, 114, 112, 110, 108, 106, 104, 102, 100, 98, 96, respectively. , The number of false-discharge discharge cells was 0 when changing to 94 micrometers.

Although not shown, when the height of the partition wall is 120 micrometers, no discharge is generated between the M electrode and the address electrode when the height of the phosphor layer is changed to less than 94 micrometers.

Therefore, in summary, when the height of the partition wall and the height of the phosphor layer satisfy the above-described <Equation 1>, and the height of the partition wall and the interval between the Y and M electrodes satisfy the <Equation 2>, It can be seen that no erroneous discharge occurs.

As described above, the plasma display panel of the present invention can obtain the following effects.

First, by limiting the height of the partition and the height of the phosphor layer is applied to a specific formula does not cause an erroneous discharge.

Second, the misdischarge does not occur by limiting the distance between the M electrode and the address electrode and the height of the phosphor layer applied to a specific formula.

Third, as addressing is performed while the M electrodes formed between all the X and Y electrodes are scanned, the discharge cells by all the X and Y electrodes can be set.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

A first panel on which a plurality of first discharge electrodes are disposed; A second panel disposed in a direction crossing the first discharge electrode and having a second discharge electrode disposed therein; A partition wall disposed between the first and second panels to define a discharge cell; And a red, green, and blue phosphor layer coated in the discharge cell. And a height of the barrier rib and a coated height of the phosphor layer satisfy Equation 1 below. <Equation 1> 0.78 ≤ H ₂ / H ₁ ≤ 0.97 Here, H ₁ is the height of the partition wall, H ₂ is the height of the phosphor layer. The method of claim 1, The first discharge electrode is composed of X electrodes alternately disposed along one direction of the front panel, a Y electrode, and an M electrode disposed in a discharge gap between the X and Y electrodes, and the second discharge electrode A plasma display panel comprising an address electrode addressed to a Y electrode. The method of claim 2, And the height of the barrier rib and the gap between the M electrode and the Y electrode satisfy the following Equation 2. <Equation 2> 1.25 ≤ H ₂ / G ≤ 1.55 Here, H ₂ is the height of the partition wall, G is the gap between the M electrode and the Y electrode. The method of claim 2, And the M electrode comprises a transparent electrode line and a bus electrode line superimposed on the transparent electrode line. The method of claim 4, wherein And the transparent electrode line is formed to be relatively wider than the bus electrode line. The method of claim 2, And the width of the M electrode is relatively narrower than the width of the X and Y electrodes. The method of claim 2, A trigger discharge voltage is applied between the X and M electrodes, and a sustain discharge voltage is applied between the X and Y electrodes.

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