KR20070095495A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to minimize a response speed delay effect and to prevent a lowering effect of discharge characteristics by adjusting a composition ratio of Mg and O. A first substrate and a second substrate are disposed in parallel to each other at an arbitrary interval. A plurality of address electrodes are formed on the first substrate. A first dielectric layer is formed on a front surface of the first substrate in order to cover the address electrodes. A plurality of barrier ribs are formed on the dielectric layer and are disposed between the first and second substrates in order to form discharge spaces at a predetermined interval. A phosphor layer is formed within the discharge space. A plurality of discharge sustain electrodes are disposed across on one side of the second substrate facing the first substrate. A second dielectric layer is formed on the second substrate in order to cover the discharge sustain electrodes. A protective layer is formed on the second substrate in order to cover the second dielectric layer. The protective layer is formed of Mg and O and has a composition ratio of Mg:O corresponding to 1:1.085 to 1.202.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a partially exploded perspective view showing an example of a plasma display panel of the present invention.

Figure 2 is a graph showing the response delay time according to the temperature of the plasma display panel of Examples 1, 2 and Comparative Examples 1 to 4 according to the present invention. (A in Comparative Example 1, B is Comparative Example 2 , C is Example 1, D is Example 2, E is Comparative Example 3, and F is Comparative Example 4)

FIG. 3 is a graph showing discharge delay times at −10 ° C. of the plasma display panels of Examples 1 and 2 and Comparative Examples 1 to 4 according to the present invention. FIG. 3A shows Comparative Examples 1 and B. FIG. Example 2, C is Example 1, D is Example 2, E is Comparative Example 3, and F is Comparative Example 4)

Figure 4 is a graph showing the discharge delay time for each temperature of the plasma display panel of Examples 1, 2 and Comparative Examples 1 to 4 according to the present invention. (In Figure 4 A is Comparative Example 1, B is Comparative Example 2 , C is Example 1, D is Example 2, E is Comparative Example 3, and F is Comparative Example 4)

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel which can improve display quality by minimizing a response delay by adjusting a composition ratio of Mg and O to a specific range when forming a protective film.

A plasma display panel (PDP) is a device that displays characters or graphics by using light emitted from a plasma generated during gas discharge. The plasma display panel (PDP) applies a predetermined voltage to two electrodes installed in a discharge space of the plasma display panel. Plasma discharge is caused to occur between them, and the phosphor layer formed in a predetermined pattern is excited by ultraviolet rays generated during the plasma discharge to form an image.

Such plasma displays are classified into AC type, DC type, and hybrid type, among which AC type is most widely used.

The AC plasma display device has a basic structure in which electrodes are alternately arranged on two substrates filled with Fe and partitioned into partitions. A dielectric layer for forming wall charges is coated on one electrode and a fluorescent layer is provided on the electrode of the opposite layer. Is formed.

The electrode, the partition, the dielectric layer, etc. are generally formed by a printing process in consideration of economical aspects, so that a thick film is formed, and thus the film formation state is considerably poorer than a thin film process.

Therefore, the sputtering of the electrons and ions generated by the discharge damages the dielectric layer and the lower electrode, thereby shortening the life of the AC plasma display device.

In order to solve this problem, a protective film is formed on the dielectric layer with a thickness of about several hundred nm for the purpose of reducing the influence of ion bombardment during discharge.

As a protective film material of the said PDP, MgO material is manufactured and used for the sintered compact. The use of MgO as a sintered compact is because quantitative doping of specific components for improving discharge characteristics is possible and can be freely controlled within its solid solution limit. The protective film made of MgO lowers the discharge voltage and protects the dielectric layer by sputtering, thereby extending the life of the AC plasma display device.

However, the higher the PDP, the smaller the cell size and the shorter the distance between electrodes, so that a higher discharge start voltage is required, which causes a problem of degrading display quality.

That is, the protective film is greatly changed in characteristics according to film formation conditions such as heat deposition, so that it is difficult to maintain a constant display quality. The passivation layer is likely to generate black noise due to an address discharge delay, that is, a discharge miss, a phenomenon in which a cell selected to emit light does not emit light. The occurrence of such black noise can easily occur at the boundary between the light emitting area and the non-light emitting area in the screen but appears at a certain place, and the discharge miss is low in intensity when there is no address discharge or even scanning discharge is performed. Caused by In particular, as in the case of high-definition PDPs, the reduction of the unit cell size adds to the severity of the problem under conditions in which discharge is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a plasma display panel which can improve display quality by improving response characteristics by minimizing response delay.

In order to achieve the above object, the present invention,

A first substrate and a second substrate disposed substantially parallel at any interval;

A plurality of address electrodes formed on the first substrate and a first dielectric layer formed on an entire surface of the first substrate while covering the address electrodes;

A plurality of partition walls provided on the first dielectric layer at a predetermined height and disposed in a space between the first substrate and the second substrate to form a discharge space partitioned at predetermined intervals;

A fluorescent layer formed in the discharge space; A plurality of discharge sustain electrodes disposed on one surface of the second substrate opposite to the first substrate in a direction crossing the address electrodes;

A second dielectric layer formed over the second substrate while covering the discharge sustain electrodes; And

A protective film containing Mg and O formed while covering the second dielectric layer,

Component ratio of Mg: O in the protective film is to be included in the range of 1: 1.085 to 1.202

Provided is a plasma display panel.

Hereinafter, the present invention will be described in detail.

The present invention is to provide a protective film that can improve the display quality of the plasma display panel by solving the problem of deterioration of discharge characteristics such as black noise due to discharge miss in a high-definition plasma display device. will be.

The protective layer covers the surface of the dielectric layer in the plasma display panel to protect the dielectric layer from ion bombardment of the discharge gas during the discharge period.

The protective film of the present invention comprises magnesium oxide (MgO) consisting of the components of Mg and O, it is characterized by controlling the component ratio of the Mg and O to a certain range.

According to the present invention, the component ratio of Mg: O is in the stoichiometric ratio in the range of 1: 1.085 to 1.202, so that oxygen is included in excess of magnesium. In this case, when the oxygen content is less than 1.085, the discharge delay becomes relatively difficult due to the black noise caused by the discharge miss, and the discharge delay time is delayed even when it exceeds 1.202, the black noise caused by the discharge miss. A problem arises.

In the present invention, the method of controlling the component ratio of Mg: O is preferably deposited in an oxygen gas atmosphere.

The protective film may be formed by a vapor deposition method or a thick film printing method using a paste, but a vapor deposition method is preferably used. The film formed by the evaporation method is preferable because it is resistant to sputtering by ion bombardment and can reduce the discharge sustain voltage and discharge start voltage due to secondary electron emission. The protective film is formed by a sputtering method, an electron beam deposition method, an ion beam assisted deposition method, an ion plating method, a magnetron sputtering method, a chemical vapor deposition method (CVD), a physical vapor deposition method (PVD). : Physical vapor deposition, physical vapor thermal deposition, plasma enhanced chemical vapor deposition, thermal deposition, vacuum thermal deposition, etc. Can be formed. Among them, it is better to use among physical vapor thermal deposition, IBAD ion beam assisted deposition, ion plating, and vacuum thermal deposition.

In the plasma display panel including the protective film of the present invention, the discharge delay time at −10 ° C. is preferably 170 to 190 nsec, and more preferably 171 to 185 nsec.

In the plasma display panel including the protective film of the present invention, the discharge delay time at 25 ° C. is 90 to 115 nsec, more preferably 96 to 109 nsec.

In addition, the plasma display panel including the protective film of the present invention preferably has a discharge delay time at 60 ° C. of 70 to 90 nsec, more preferably 72 to 83 nsec.

In addition, the transmittance of the MgO protective film formed of the thin film of electron-emissive film of the present invention is at least 90% or more, and preferably has a refractive index of 1.45 to 1.74 at 640 nm.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the plasma display panel of the present invention having the protective film.

1 is a partially exploded perspective view showing an example of a plasma display panel of the present invention, the contents of the present invention is not limited to the structure of FIG. Referring to the drawings, in the plasma display panel of the present invention, address electrodes 3 are formed in one direction (Y direction in the drawing) on the first substrate 1, and the first electrodes cover the address electrodes 3. The dielectric layer 5 is formed on the front surface of the substrate 1. The partition wall 7 is formed on the dielectric layer 5, and red (R), green (G), and blue (B) are formed on the bottom surface 5a and the partition side surface 7a of the discharge cell between each partition wall 7. Phosphor layer 9) is located,

One surface of the second substrate 11 opposite to the first substrate 1 includes a pair of transparent electrodes 13a and bus electrodes 13b along a direction orthogonal to the address electrode 3 (X direction in the drawing). The discharge sustain electrodes 13 are formed, and the transparent dielectric layer 15 and the passivation layer 17 of the present invention are disposed on the entire second substrate 11 while covering the discharge sustain electrodes 13. As a result, the intersection of the address electrode 3 and the discharge sustaining electrode 13 constitutes a discharge cell.

With this configuration, the address discharge is applied by applying the address voltage Va between the address electrode 3 and any one of the discharge sustaining electrodes 13, and the sustain voltage Vs is again generated between the pair of discharge sustaining electrodes 13. ), The vacuum ultraviolet rays generated during the sustain discharge excite the phosphor layer 9 to emit visible light through the transparent front substrate 11.

In the above, the edges of the first substrate and the second substrate are coated with a frit to seal both substrates, and a plasma display panel is manufactured by injecting a discharge gas such as Ne or Xe.

In the plasma display panel according to the exemplary embodiment of the present invention, a driving voltage is applied from the electrodes to generate an address discharge between the electrodes to form wall charges in the dielectric layer, and to form a second charge in the discharge cells selected by the address discharge. Sustain discharge is caused between these electrodes by an alternating current signal supplied alternately to the pair of electrodes formed on the substrate. Accordingly, the discharge gas charged in the discharge space forming the discharge cell is excited and transitioned to generate ultraviolet rays, and to generate an image while generating visible light by excitation of the phosphor by the ultraviolet rays.

The manufacturing method of the plasma display panel of the present invention having the above-described structure is well known in the art, and can be fully understood by those skilled in the art, and thus the detailed description thereof will be omitted.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention and the present invention is not limited by the following examples.

(Examples 1 and 2)

On the second substrate made of soda-lime glass, an indium tin oxide conductor material was used to form a discharge sustaining electrode in a stripe shape in a conventional manner. Subsequently, a paste of lead-based glass was coated over the entire surface of the upper substrate on which the discharge sustaining electrode was formed and baked to form a second dielectric layer.

Thereafter, an MgO protective film was formed on the second dielectric layer by using an ion plating method. At this time, the component ratio of Mg and O was to be as shown in Table 1 in the stoichiometric ratio.

After preparing a first substrate on which an address electrode, a dielectric layer, a partition, and a phosphor layer are formed, the panel is assembled, sealed, evacuated, fed, and aged in a conventional manner using the first and second substrates to form a plasma display panel. Prepared.

(Comparative Examples 1 to 4)

A plasma display panel was manufactured in the same manner as in Example 1, except that the component ratios of Mg and O were used in the same manner as in Table 1 below.

(Comparative Example 5)

A plasma display panel was manufactured in the same manner as in Example 1, except that a single crystal manufactured by a general sintering method was used.

TABLE 1

 Stoichiometry of Mg: O  Comparative Example 1  Mg: O  1: 1.038  Comparative Example 2  Mg: O  1: 1.063  Example 1  Mg: O  1: 1.085  Example 2  Mg: O  1: 1.202  Comparative Example 3  Mg: O  1: 1.217  Comparative Example 4  Mg: O  1: 1.231  Comparative Example 5  Mg: O  1: 1.000

Experimental Example

For Examples 1 and 2 and Comparative Examples 1 to 4, the response delay time (Ts) according to temperature was measured by a conventional method, and the results are shown in Table 2 and FIG. 2. In FIG. 2, A (□): Comparative Example 1, B (◇): Comparative Example 2, C (▲): Example 1, D (●): Example 2, E (■): Comparative Example 3, F ( ◆): This is Comparative Example 4.

TABLE 2

 Ts (average)  -10 ℃  25 ℃  60 ℃  Comparative Example 1  418  233  154  Comparative Example 2  338  185  137  Example 1  185  109  83  Example 2  171  96  72  Comparative Example 3  357  198  161  Comparative Example 4  382  251  179

NOTE 2 In Table 2, Ts is the statistical delay time, which has a slope in which a plurality of measured signals decrease exponentially and has a constant dispersion, which is a specific value that can be statistically represented. It means to arrange the measured data in order and take the value located in the specific order. The unit is nsec.

In addition, the discharge delay time at −10 ° C. was measured with the conventional methods for Examples 1 and 2 and Comparative Examples 1 to 4, and the results are shown in FIG. 3.

In addition, for Examples 1, 2 and Comparative Examples 1 to 4, the discharge delay time at -10 ° C, 25 ° C, and 60 ° C was measured by a conventional method, and the results are shown in FIG. 4.

3 and 4, A is Comparative Example 1, B is Comparative Example 2, C is Example 1, D is Example 2, E is Comparative Example 3, and F is Comparative Example 4.

From the results of Figs. 2 to 4, Examples 1 and 2 are preferably used as conditions under which discharge stability can be secured at -10 ° C. In Comparative Examples 1 to 4, discharges such as black noise due to discharge misses are caused. It caused a problem of deterioration.

As described above, the present invention can minimize the response speed delay by controlling the composition ratio of Mg and O when forming the MgO protective film, thereby preventing the discharge characteristics such as sizzling and improving the display quality of the plasma display panel.

Claims (9)

A first substrate and a second substrate disposed substantially parallel at any interval, A plurality of address electrodes formed on the first substrate, a first dielectric layer formed over the first substrate while covering the address electrodes; A plurality of partition walls provided on the first dielectric layer at a predetermined height and disposed in a space between the first substrate and the second substrate to form a discharge space partitioned at a predetermined interval; A fluorescent layer formed in the discharge space, A plurality of discharge sustain electrodes disposed on one surface of the second substrate opposite to the first substrate in a direction crossing the address electrodes; A second dielectric layer formed over the second substrate while covering the discharge sustain electrodes; and A protective film containing Mg and O formed while covering the second dielectric layer, In the protective film, the component ratio of Mg: O is included in the range of 1: 1.085 to 1.202. Plasma display panel. The plasma display panel of claim 1, wherein the plasma display panel has a discharge delay time of −10 ° C. from 170 to 190 nsec. The plasma display panel of claim 2, wherein the plasma display panel has a discharge delay time at -10 ° C of 171 to 185 nsec. The plasma display panel of claim 1, wherein the plasma display panel has a discharge delay time at 25 ° C of 90 to 115 nsec. The plasma display panel of claim 4, wherein the plasma display panel has a discharge delay time at 25 ° C. of 96 to 109 nsec. The plasma display panel of claim 1, wherein the plasma display panel has a discharge delay time at 60 ° C of 70 to 90 nsec. The plasma display panel of claim 6, wherein the plasma display panel has a discharge delay time of 60 to 72 nsec. The method of claim 1, wherein the MgO protective film is formed by sputtering, electron beam deposition, ion beam assisted deposition (IBAD ion beam assisted deposition), ion plating, magnetron sputtering, chemical vapor deposition (CVD), and physical vapor deposition (CVD). (PVD: Physical Vapor Depositio), Physical Vapor Thermal Deposition, Plasma Enhanced Chemical Vapor Deposition, Thermal Deposition, and Thermal Thermal Deposition. The plasma display panel is formed by a method selected from the group consisting of. The MgO protective film of claim 8, wherein the MgO protective film is formed by physical vapor thermal deposition, ion beam assisted deposition (IBAD), ion plating, and vacuum thermal deposition. The plasma display panel is formed by a method selected from the group consisting of

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