KR100581914B1 - Plasma display panel - Google Patents

Abstract

According to the present invention, a plasma display panel is disclosed. The plasma display panel is a plasma display panel in which a first panel and a second panel are faced to each other. The overlapping area of the first panel and the second panel surrounds a display area in which a plurality of light emitting cells are arranged and the display area. A peripheral area, wherein the display area includes a discharge part for discharging and a non-discharge part for discharging, wherein at least one dummy cell for discharging is not formed, and the non-discharge part and the dummy cell are formed. It characterized in that the impure gas adsorption layer is formed. According to the disclosed plasma display panel, deterioration of the phosphor layer is prevented and driving efficiency is improved.

Description

Plasma display panel {Plasma display panel}

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

2 is a plan view illustrating a plasma display panel according to an exemplary embodiment of the present invention;

FIG. 3 is a view illustrating the plasma display panel of FIG. 2, and taken along line III-III of FIG. 2.

4 is a cross-sectional view of the plasma display panel of FIG.

5 is a cross-sectional view showing a plasma display panel according to another embodiment of the present invention;

6 is a plan view showing a plasma display panel according to another embodiment of the present invention;

FIG. 7 is an exploded perspective view showing part VII of FIG. 2;

FIG. 8 is a diagram illustrating the plasma display panel of FIG. 7, and is a cross-sectional view taken along line VIII-VIII of FIG. 7.

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

10 ... first panel 11 ... first substrate

12 ... scanning electrode 13 ... display electrode

12a, 13a ... transparent electrodes 12b, 13b ... bus electrodes

14 first dielectric layer 15 protective layer

16 ... discharge sustaining electrode pair 20 ... second panel

21 ... second substrate 22 ... address electrode

23 second dielectric layer 24 bulkhead

25 phosphor layer 26 encapsulant

27 Ventilation vent 28 Ventilation vent

101 The area where the first and second panels overlap

103 Display area 104 Light emitting cell

105 Dummy Cell 106 Exhaust Channel

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which deterioration of a phosphor layer is prevented and driving efficiency is improved.

The plasma display panel is a flat panel display panel which displays an image by using gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, and viewing angle. In addition, it is being spotlighted as a next-generation flat panel display panel that can be replaced with a CRT by being thin and having a large screen display.

1 shows an example of a conventional plasma display panel. Referring to the drawings, the plasma display panel includes a first panel 10 and a second panel 20 bonded to each other.

1 is a partially enlarged cross-sectional view, for convenience of description, the first panel 10 is shown rotated 90 degrees around the L-L line.

Referring to the enlarged cross-sectional view, the first panel 10 is disposed on the first substrate 11, the lower side of the first substrate 11, for example, on a lower surface of the first substrate 11. A protective layer 15 having a first dielectric layer 14 covering the electrode pairs 16 and the discharge sustaining electrode pairs 16, preferably formed of MgO covering the first dielectric layer 14. It is further provided.

On the other hand, the second panel 20 is the second substrate 21 disposed to face the first panel 10, the upper side of the second substrate 21, for example, of the second substrate 21 Address electrodes 22 formed on the upper surface, a second dielectric layer 23 covering the address electrodes, a partition wall 24 formed on the second dielectric layer 23 and defining a plurality of light emitting cells and the light emitting cells Phosphor layer 25 applied over the inside of the field. In addition, a discharge gas, for example, a Ne-Xe mixed gas is enclosed in the light emitting cell.

The first panel 10 and the second panel 20 formed as described above are joined by an encapsulant 26, for example, a frit. After this sealing step, an exhaust step of removing impurity gas such as water vapor remaining in the panel is performed. To this end, a vent hole 27 and a vent pipe 28 communicating with the second panel 20 are formed on the rear surface of the second panel 20.

The vent pipe 28 drives a vacuum pump (not shown) to exhaust the inside of the panel, and discharge gas is injected into the panel using a gas injection device (not shown). After the discharge gas is injected, sealing operation of the vent pipe 28 is performed, and the sealing operation is performed by melting and compressing the vent pipe 28 using a plasma burner or the like.

However, a structure such as a partition wall 24 is formed inside the panel, and has a considerable exhaust resistance. In order to obtain a desired degree of vacuum in the exhaust process, a considerable amount of time and effort are required, so that exhaustion of impurity gas is practically difficult.

If the impurity gas is not removed and remains together with the discharge gas, the discharge is inhibited and the driving efficiency of the panel decreases, such as an increase in the discharge start voltage.

In particular, the phosphor layer 25 formed of a hygroscopic material absorbing impurity gas, in particular water vapor, tends to deteriorate. In this case, a bright afterimage is caused, the luminance characteristics and color purity of the panel are deteriorated, and the lifetime is shortened. Problems such as deterioration of efficiency occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and other problems, and an object thereof is to provide a plasma display panel having an improved structure in which degradation of a phosphor is prevented.

Another object of the present invention is to provide a plasma display panel in which driving efficiency is improved.

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

In the plasma display panel bonded to the first panel and the second panel facing each other,

The region where the first panel and the second panel overlap each other includes a display area in which a plurality of light emitting cells are arranged and a peripheral area surrounding the display area.

The display area includes a discharge portion where discharge is performed and a non-discharge portion where discharge is not performed,

At least one dummy cell in which the discharge is not performed is formed in the peripheral region,

The non-discharge unit and the dummy cell are characterized in that the impure gas adsorption layer is formed.

The non-discharge unit may be an exhaust passage formed in the display area, and the dummy cell may be formed adjacent to the outermost light emitting cell of the display area.

The impurity gas adsorption layer is preferably formed by coating a phosphor containing at least one element of Ba and Mg.

Phosphor layers are formed in the light emitting cells, and at least some of the phosphor layers and the impurity gas adsorption layers of the light emitting cells are preferably formed by coating substantially the same phosphor.

The impurity gas adsorption layer is preferably formed by applying a getter material.

2 illustrates a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2.

Referring to the drawings, the plasma display panel includes a first panel 10 and a second panel 20 bonded to each other. The first panel 10 and the second panel 20 are joined by an encapsulant 26, for example, a frit, and an area where the first panel 10 and the second panel 20 overlap ( As shown in FIG. 2, the display 101 includes a display region 103 in which a plurality of light emitting cells 104 are discharged, and a peripheral region 102 surrounding the display region 103. The display area 103 is an area where an image is displayed by performing display discharge, and a plurality of light emitting cells 104 are disposed in the display area 103.

In the peripheral region 102, a dummy cell 105 in which discharge is not performed is formed. As shown in FIG. 2, the dummy cells 105 are formed adjacent to the outermost light emitting cells 104 of the display area 103, and a row of dummy cells 105 extends in the transverse direction of the panel.

In the peripheral region 102, a vent 27 for exhausting impurity gas of the light emitting cells 104 formed in the display region 103 and filling the discharge gas is formed. In addition, referring to FIG. 3, a vent pipe 28 communicating with the vent hole 27 is formed on the lower surface of the second panel 20.

4 is a cross-sectional view illustrating part IV of the plasma display panel illustrated in FIG. 3. For convenience of description, the first panel 10 above the L-L line is shown rotated 90 degrees.

Referring to the drawings, the first panel 10 includes a first substrate 11 and a discharge sustaining electrode disposed under the first substrate 11, for example, on a lower surface of the first substrate 11. And a protective layer 15 formed of MgO which covers the first dielectric layer 14 and has a first dielectric layer 14 covering the pairs 16 and the discharge sustaining electrode pairs 16. Equipped.

The first substrate 11 is generally formed of a transparent material mainly composed of glass.

The discharge sustaining electrode pair 16 refers to electrodes for which a discharge is performed. One discharge sustaining electrode of the discharge sustaining electrode pair 16 is the scan electrode 12, and the other discharge sustaining electrode is the display electrode 13. )to be.

Each of the scan electrode 12 and the display electrode 13 may include transparent electrodes 12a and 13a and bus electrodes 12b and 13b. The transparent electrodes 12a and 13a may be formed of indium tin oxide (ITO), which is a light transmissive electrode material. The bus electrodes 12b and 13b are formed at the outer ends of the discharge sustaining electrode pair 16, and the bus electrodes 12b and 13b are used to improve the electrical resistance of the discharge sustaining electrode pair 16. It can be formed of a superior metal material, for example, a single metal layer of Ag or a Cr-Cu-Cr triple metal layer.

Here, the discharge sustaining electrode 16 is formed only in the light emitting cell 104 in which the discharge is performed, and the electrode 16 is not formed in the dummy cell 105 in which the discharge is not performed.

The first dielectric layer 14 prevents cations or electrons from directly colliding with the discharge sustaining electrode pair 16 and thus damages the discharge sustaining electrode pair 16, while helping to accumulate wall charges. The first dielectric layer may be formed of PbO, B ₂ O ₃ , SiO _2, or the like.

The protective layer 15 is a material that prevents cations and electrons from colliding with the first dielectric layer 14 during the discharge and damages the first dielectric layer 14, and is light-transmitting and emits a lot of secondary electrons during discharge. It is preferable to form MgO, which is usually used.

On the other hand, the second panel 20 is the second substrate 21 disposed to face the first panel 10, the upper side of the second substrate 21, for example, of the second substrate 21 Address electrodes 22 formed to intersect the discharge sustaining electrode pair 16 on an upper surface thereof, a second dielectric layer 23 covering the address electrodes, and a second dielectric layer 23 formed on the second dielectric layer 23. A partition wall 24 defining the cells 104 and the dummy cell 105, a phosphor layer 25 formed inside the light emitting cells 104, and an impurity gas adsorption layer formed on the dummy cell 105 ( 100).

The second substrate 21 functions to support the address electrodes 22, the second dielectric layer 23, and the like, and is typically formed of glass as a main material.

The address electrodes 22 extend in a direction crossing the discharge sustaining electrode pair 16. These address electrodes 22 perform an address discharge to facilitate a discharge between the scan electrode 12 and the display electrode 13.

In this case, the address electrode 22 is formed only in the light emitting cell 104 in which the discharge is performed, and the electrode 22 is not formed in the dummy cell 105 in which the discharge is not performed.

The second dielectric layer 23 prevents damage of the address electrode 22 due to cations or electrons colliding with the address electrode 22 during discharge, and induces charge. The dielectric layer 23 is formed of PbO, It may be formed of B ₂ O ₃ , SiO ₂ and the like.

The partition wall 24 partitions a region to which the phosphor is applied and prevents erroneous discharge between the light emitting cells 104.

A plurality of light emitting cells 104 and dummy cells 105 are partitioned by the partition walls 24, and phosphor layers 25 are formed in the light emitting cells 104. The phosphor layer 25 is formed by applying a phosphor, and the phosphor includes red, green, and blue tricolor phosphors. The light emitting cells 104 are classified into a red light emitting cell, a green light emitting cell, and a blue light emitting cell according to the type of phosphor coated therein.

Here, (Y, Gd) BO ₃ : Eu powder may be used as the red phosphor.

As the green phosphor, Zn ₂ SiO ₄ : Mn powder may be used alone, or a mixture of Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb powder may be used. Further, Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn phosphor powders may be mixed and used.

BaMgAl ₁₀ O ₁₇ : Eu powder may be used as the blue phosphor.

On the other hand, the impurity gas adsorption layer 100 is formed in the dummy cell 105. The impurity gas adsorption layer 100 is formed of a material having excellent properties of absorbing impurity gas, and such materials include getters and phosphors.

Here, the phosphor forming the impurity gas absorption layer 100 is mainly a BAM-based phosphor, and the BAM-based phosphor is a phosphor containing Ba and Mg having good hygroscopicity, which is a kind of green phosphor (Ba, Sr, Mg). ) O.aAl ₂ O ₃ : Mn or BaMgAl ₁₀ O ₁₇ : Eu, which is a kind of blue phosphor.

Impurity gas adsorption layer 100 may be formed by applying a non-evaporable getter (Getter), such a getter may be composed mainly of oxide powder of at least one metal selected from W, Ti, Zr, Al, V, Fe. .

On the other hand, the discharge gas is filled in the panel, the Ne-Xe mixed gas is mainly used as such discharge gas.

5 is a cross-sectional view of a plasma display panel according to another embodiment of the present invention. For convenience of explanation, the first panel 10 is shown rotated 90 degrees around the L-L line.

Referring to the drawing, the light emitting cell 104 and the dummy cell 105 adjacent to each other are formed in two rows in the peripheral region 102. When a plurality of dummy cells 105 having the impurity gas adsorption layer 100 are formed, more impurities may be absorbed inside the panel, which is advantageous for maintaining cleanliness of the panel, and deterioration of the phosphor layer 25 Is prevented.

6 is a plan view of a plasma display panel according to another embodiment of the present invention. As can be seen in the figure, a dummy cell 105 is formed adjacent to the outermost light emitting cell 104 in the peripheral area 102, such that the columns of the dummy cell 105 surround the display area 102. Extend in the longitudinal and transverse directions. As described above, only a row of dummy cells 105 is formed in the transverse direction (see FIG. 2) of the panel, and thus, the impurity gas adsorption layer 100 (see FIG. 4) is disposed in more regions. Can be.

On the other hand, Figure 7 is an exploded perspective view showing part VII of FIG. Referring to the drawings, the first panel 10 includes a plurality of bus electrodes 12b and 13b formed in a predetermined pattern, for example, a stripe pattern on a lower surface of the first substrate 11 and the first substrate 11. And pairs of discharge sustaining electrode pairs 16 having transparent electrodes 12a and 13a protruding from the bus electrodes 12b and 13b to face each other, and a first dielectric layer filling the discharge sustaining electrode pairs 16. (14) and a protective layer (15) formed on the lower surface of the first dielectric layer (14).

Meanwhile, the second panel 20 includes a second substrate 21, a plurality of address electrodes 22 formed in a predetermined pattern, for example, a stripe pattern on the second substrate 21, and an address electrode 22. The second dielectric layer 23 formed on the second substrate 21 to fill the gaps), the partition 24 formed on the second dielectric layer 23 to partition the plurality of light emitting cells 104, and the light emitting cell 104. Phosphor layer 25 is formed in ().

Here, the discharge space between the first substrate 11 and the second substrate 21 is divided into a discharge portion where discharge is performed and a non-discharge portion where discharge is not performed by the partition wall 24. Here, the discharge unit may be, for example, an area where the light emitting cells 104 occupy. In addition, the non-discharge unit may be, for example, an exhaust passage 106 disposed between one row of light emitting cells.

The exhaust passage 106 provides an exhaust passage for the impure gas filled in the discharge space during the exhaust process, and provides an inflow passage for the discharge gas during the encapsulation process.

The impurity gas adsorption layer 100 is formed in the exhaust passage 106. As described above, the impurity gas adsorption layer 100 may be formed by applying a phosphor or a getter of a BAM series.

Comparative Example 1

The blue blue phosphor of the BAM series only the light emitting cells BaMgAl ₁₀ O _17: measuring the chromaticity coordinates in the case of applying the Eu: BaMgAl ₁₀ O ₁₇ in the case and, all of the non of more micelles and the display region with the blue light-emitting cells coated with Eu The results were compared.

 Blue light emitting cell Blue light emitting cell + dummy cell + non-discharge part  Blue y coordinate  0.084  0.065

From the experimental results, when the BAM-based phosphor (BaMgAl ₁₀ O ₁₇ : Eu) is applied to not only the light emitting cell but also the dummy cell and the non-discharge, blue y color coordinates are reduced, thereby improving color purity and achieving high quality images. It can be seen that. This is because the BAM-based phosphor (impurity gas adsorption layer) applied to the dummy cell and the non-discharge part absorbs the impurity gas, thereby preventing deterioration of the phosphor layer formed in the light emitting cell.

Comparative Example 2

Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, which is a green phosphor, is applied to the green light emitting cell in a molar composition ratio of 50:50, and Zn ₂ SiO ₄ : The color coordinates of Mn, YBO ₃ : Tb, and (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (BAM series) in a molar composition ratio of 30:35:35 were measured to compare the results.

 Green light emitting cell Green light emitting cell + dummy cell + non-discharge part  Green y coordinate  0.091  0.079

From the experimental results, it can be seen that the green y color coordinate is reduced when the BAM series phosphor is coated on the green light emitting cell, the dummy cell and the non-discharge portion of the display area. This is because the BAM-based phosphor (impurity gas adsorption layer) applied to the dummy cell and the non-discharge part absorbs the impurity gas to prevent deterioration of the phosphor layer applied to the light emitting cell. Here, compared with the experimental results of [Example 1], it can be seen that the effect of improving the color coordinates is small, which is the phosphor used in [Example 2] BAM series phosphor ((Ba, Sr, Mg) O This is because aAl ₂ O ₃ : Mn) is less contained.

On the other hand, when the impurity gas adsorption layer is formed of a BAM-based phosphor, such a phosphor may be simultaneously applied in the process of applying the phosphor to the light emitting cell. For example, if the phosphor is applied by screen printing, the impure gas adsorption layer can be formed simply by modifying the opening pattern of the screen mask.

According to the plasma display panel of the present invention, the following effects can be achieved.

First, deterioration of the phosphor layer is prevented. According to the present invention, by forming the impurity gas adsorption layer, it is possible to prevent the phosphor layer from absorbing impurity gas and deteriorating it. Therefore, the luminance characteristics and color purity of the panel are improved, and the life of the product is extended. In addition, the quality of the display is improved by removing the bright afterimage caused by the deterioration of the phosphor layer.

Second, the driving efficiency of the panel is improved. According to the present invention, the impurity gas adsorption layer is formed, whereby the impurity gas remaining in the panel is absorbed and removed, thereby improving the purity of the discharge gas and promoting discharge.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art to which the present invention pertains. You will understand the point. Therefore, the true scope of protection of the present invention should be defined by the appended claims.

Claims (6)

In the plasma display panel bonded to the first panel and the second panel facing each other, The region where the first panel and the second panel overlap each other includes a display area in which a plurality of light emitting cells are arranged and a peripheral area surrounding the display area. The display area includes a discharge portion where discharge is performed and a non-discharge portion where discharge is not performed, At least one dummy cell in which the discharge is not performed is formed in the peripheral region, The non-discharge unit and the dummy cell plasma display panel, characterized in that the impurity gas adsorption layer formed by applying a BAM-based phosphor containing at least one element of Ba and Mg is disposed. The plasma display panel of claim 1, wherein the non-discharge unit is an exhaust passage formed in the display area. The plasma display panel of claim 1, wherein the dummy cell is formed adjacent to the outermost light emitting cell of the display area. delete The plasma display panel of claim 1, wherein a phosphor layer is formed inside the light emitting cells, and at least some of the phosphor layer and the impurity gas adsorption layer of the light emitting cells are formed by coating substantially the same phosphor. The plasma display panel of claim 1, wherein the impurity gas adsorption layer is formed by applying a getter material.

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