KR100625986B1 - MgO layer and plasma display panel therewith - Google Patents

Abstract

An object of the present invention is to provide an MgO film and a plasma display panel having the same, which reduce discharge delay. To achieve this object, an X-ray diffraction intensity of the (111) plane can be obtained. Provided are a MgO film for a plasma display panel and a plasma display panel including the same, wherein the ratio of the X-ray diffraction intensity of the (220) plane is 7/3 or more.

Description

MgO film and plasma display panel having same {MgO layer and plasma display panel therewith}

1 is a cross-sectional view of a plasma display panel according to an embodiment of the present invention.

2 is a graph showing the discharge delay time with respect to the X-ray diffraction intensity percentage of the (220) plane according to Table 1,

3A shows a crystal photograph in which the ratio of the X-ray diffraction intensity percentage between the (111) plane and the (220) plane is 95: 5,

FIG. 3B shows a crystal photograph in which the ratio of the X-ray diffraction intensity percentage between the (111) plane and the (220) plane is 85:15,

3C shows a crystal photograph with an X-ray diffraction intensity percentage ratio of 45:55 between a (111) plane and a (220) plane,

FIG. 3D shows a crystal photograph in which the ratio of the X-ray diffraction intensity percentage between the (111) plane and the (220) plane is 30:70,

3E shows a crystal photograph in which the ratio of the X-ray diffraction intensity percentage between the (111) plane and the (220) plane is 20:80.

Explanation of symbols on the main parts of the drawings

10: plasma display panel 11: front substrate

12: sustain electrode pair 14: bus electrode

15 front dielectric layer 16 MgO film

21 back substrate 22 address electrode

25 back dielectric layer 26 phosphor layer

30: partition 40: external light reflection absorbing layer

The present invention relates to a plasma display panel, and more particularly, to an MgO film and a plasma display panel having the same.

In general, an MgO film is formed under the front dielectric layer of the upper surface of the plasma display panel as a protective layer. As the vacuum equipment for forming the MgO film, there are an e-beam evaporator, a sputter, and the like. By the way, when a MgO film is formed using such a vacuum facility, the film which has a (111) plane crystal orientation will mainly grow. MgO films having a (111) plane crystal orientation have poor characteristics in secondary electron emission and discharge delay. In particular, when the discharge delay is large, it causes a problem in the discharge characteristics of the plasma display panel. In addition, when the secondary electron emission is low, the driving voltage must be increased, thereby increasing power consumption and shortening the lifetime of the plasma display panel due to sputtering caused by discharge.

SUMMARY OF THE INVENTION An object of the present invention is to provide a MgO film and a plasma display panel including the same, which solve the above problems and reduce discharge delay.

In order to achieve the above and other objects, the present invention provides a ratio of the X-ray diffraction intensity of the (220) plane to the X-ray diffraction intensity of the (111) plane of 7/3 or more. An MgO film for a plasma display panel is provided.

According to yet another aspect of the present invention, there is provided an MgO film for a plasma display panel, which has a (220) plane crystal orientation.

According to still another aspect of the present invention, there is provided a plasma display panel comprising the MgO film described above.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, there is shown a cross-sectional view of a plasma display panel 10 according to a preferred embodiment of the present invention.

As shown, the AC plasma display panel 10 according to the present invention includes an upper plate 50 showing an image to a user and a lower plate 60 coupled in parallel thereto. 1 shows a state in which the lower plate 60 is rotated 90 degrees for convenience of description. On the front substrate 11 of the upper plate 50, a sustain electrode pair 12 is formed in which the X electrode X and the Y electrode Y are paired, and the sustain electrode pair 12 of the front substrate 11 is disposed. On the rear substrate 21 of the lower substrate 60 opposite to the disposed surface, the address electrodes 22 are disposed so as to intersect the electrodes X and Y of the front substrate 11. The sustain electrode pair 12 including the X and Y electrodes X and Y of the front substrate 11 may preferably use a transparent electrode made of indium tin oxide (ITO). Under these transparent electrodes, a bus electrode 14 having a narrow width is disposed to reduce the line resistance. The space formed by the pair of X and Y electrodes X and Y arranged in this way and the address electrodes 22 intersecting with each other forms one discharge unit as a unit discharge cell. In order to increase the contrast, an external light reflection absorbing layer 40 formed in parallel with the sustain electrode pair 12 is disposed in the non-discharge portion between the sustain electrode pairs 12.

The front dielectric layer 15 and the front substrate 11 having the X and Y electrodes X and Y are embedded in each surface of the back substrate 21 having the address electrode 22. The back dielectric layer 25 is formed. The MgO film 16 is formed on the front dielectric layer 15, and the partition wall 30 is formed on the back dielectric layer 25 to maintain a discharge distance and prevent electro-optic crosstalk between discharge cells. have. Red, green, and blue phosphors 26 are coated on both side surfaces of the barrier rib 30 and the upper surface of the back dielectric layer 25 on which the barrier rib 30 is not formed.

The operation of the plasma display panel 10 having such a structure is as follows. When a predetermined voltage is applied to the address electrode 22 and the Y electrode Y, an address discharge occurs between the two electrodes, and wall charges are charged on the front dielectric layer 15 to select a discharge cell for emitting light. When a predetermined voltage is applied between the X electrode X and the Y electrode Y, wall charges move between the two electrodes X and Y, causing the discharge gas to cause a sustain discharge, thereby discharging the discharge gas. Generates ultraviolet rays, and the generated ultraviolet rays excite the phosphor 26 to form an image. In this case, the plasma display panel 10 adjusts the number of sustain discharges according to the video data to implement gray levels necessary for displaying an image, and in order to express such gray levels, one frame typically has a different number of discharge times. The ADS (Address and Display Period Separated) method of driving by dividing into several subfields is mainly used.

The MgO film 16 may have a crystal alignment structure of various combinations. The crystal orientation structure has conventionally (111) plane crystal orientation mainly. However, when the characteristics of the MgO film 16 are close to those of the MgO bulk, the inherent properties of MgO can be better exhibited. That is, the MgO film 16 according to the present invention must be formed to have a (220) plane crystal orientation, which is a main component of the MgO bulk, to reduce the discharge delay time and to increase the secondary electron emission. Therefore, an MgO film with reduced (111) plane crystal orientation and increased (220) plane crystal orientation should be formed. Table 1 shows the result of measuring the discharge delay time according to the X-ray diffraction intensity percentage ratio of the (111) plane and the (220) plane of the MgO film. The (111) plane crystal orientation and the (220) plane crystal orientation of the MgO film are formed by adjusting gas partial pressure such as oxygen in the vacuum equipment chamber. Here, discharge delay time is the result measured at normal temperature (25 degreeC).

X-ray diffraction intensity percentage ratio, (111) plane: (220) plane 95: 5 85:15 45:55 30:70 20:80 Discharge Delay Time (nsec) 263 225 187 131 121

2 is a graph showing the discharge delay time with respect to the X-ray diffraction intensity percentage of the (220) plane according to Table 1. FIG. The horizontal axis of the graph represents the (220) plane X-ray diffraction intensity percentage, and the vertical axis represents the discharge delay time. As shown, it can be seen that as the X-ray diffraction intensity percentage of the (220) plane in the MgO film increases, the discharge delay time decreases. That is, the discharge delay time is reduced from 263 ms when the X-ray diffraction intensity percentage ratio is 95: 5 and 121 ms when the X-ray diffraction intensity percentage ratio is 20:80. That is, it can be seen that the discharge delay time decreases as the (220) plane crystal orientation increases in the MgO film. The discharge delay time should be reduced as much as possible in order to maintain stable discharge characteristics of the plasma display panel. Therefore, in the present invention, it is preferable that an MgO film having only a (220) plane crystal orientation is formed. Further, even in the case of the MgO film having the (111) plane crystal orientation as well as the (220) plane crystal orientation, considering that the discharge delay time in the plasma display panel is 131 ms or less, stable discharge characteristics can be maintained. The discharge delay time is preferably 131 ms or less when the ratio of the (220) plane X-ray diffraction intensity to the plane X-ray diffraction intensity is 7/3 or more. Therefore, in the case of the plasma display panel 10 having the MgO film 16 according to the present invention, the discharge delay time is reduced, thereby having stable discharge characteristics. In addition, since the characteristics of the MgO film 16 become close to those of the MgO bulk, secondary electron emission is increased.

3A to 3 show crystal photographs of the MgO films of Table 1. FIG. Referring to the drawings, FIG. 3A shows a crystal photograph in which the X-ray diffraction intensity percentage ratio of the (111) plane and the (220) plane is 95: 5, and FIG. 3B shows the X-ray diffraction intensity of the (111) plane and the (220) plane. The crystal photograph with a percentage ratio of 85:15 is shown. 3C shows a crystal photograph in which the X-ray diffraction intensity percentage ratio of the (111) plane and the (220) plane is 45:55, and FIG. 3D shows that the X-ray diffraction intensity percentage ratio of the (111) plane and the (220) plane is 30. A crystal photograph of 70 is shown. Finally, FIG. 3E shows a crystal photograph in which the X-ray diffraction intensity percentage ratio of the (111) plane and the (220) plane is 20:80.

Like reference numerals in the drawings shown above indicate the same members.

The plasma MgO film and the plasma display panel including the same according to the present invention have the following effects.

First, since the discharge delay time is reduced, the plasma display panel has stable discharge characteristics.

Second, the (220) plane orientation crystal is increased, so that the emission of secondary electrons is increased because the properties of the MgO film are close to those of the MgO bulk. Therefore, the discharge voltage of the plasma display panel can be lowered, so that power consumption is reduced, and the lifetime of the plasma display panel is increased.

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

Claims (3)

The ratio of the X-ray diffraction intensity of the (220) plane to the X-ray diffraction intensity of the (111) plane is 7/3 or more. delete The MgO film | membrane of Claim 1 is provided, The plasma display panel characterized by the above-mentioned.

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