KR100987125B1 - Front substrate having bowl structure dielectric layer, method for manufacturing that, and PDP having that - Google Patents

Abstract

The present invention relates to a front substrate having a dielectric layer having a ball structure, a method of manufacturing the same, and a plasma display panel including the same, by forming balls of minute diameter and depth on one surface of a protective layer deposited on the front dielectric layer of the front substrate. The discharge sustain voltage is lowered and the luminance is increased to provide the effect of improving the luminous efficiency.

PDP, Plasma, Dielectric, Front Board

Description

Front substrate having a bowl structure dielectric layer and a method for manufacturing the same and a plasma display panel comprising the same

The present invention relates to an AC plasma display device, which is one of flat panel display devices, and more particularly, to a front substrate constituting the plasma display device, a manufacturing method of the front substrate, and a plasma display device including the front substrate. will be.

Recently, unlike conventional CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display), the plasma display panel (Plasma) is a digital display device that can adjust brightness by digital signal and display a large screen more clearly. Interest in display panels) is increasing rapidly.

Plasma Display Panel (PDP) forms an image by using electric discharge, and has excellent display performance such as brightness and viewing angle regardless of the panel size. The demand is increasing day by day.

In the plasma display panel, a discharge occurs in a gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and phosphors are excited by the radiation of ultraviolet rays accompanying the gas discharge process to emit visible light.

The plasma display panel is classified into a DC type and an AC type according to its discharge type, and the DC type plasma display panel is a structure in which all electrodes are exposed to a discharge space, While the movement is performed directly, in the AC plasma display panel, at least one electrode is surrounded by a dielectric layer, and discharge is performed by wall charge instead of direct charge transfer between the corresponding electrodes. .

FIG. 1 is a partially cutaway perspective view schematically illustrating a structure of a conventional AC plasma display panel, and FIG. 2 is a partial cross-sectional view of FIG. 1. As illustrated, AC plasma display panel 10 may face each other. It includes a back substrate 30 and the front substrate 20.

On the upper surface of the back substrate 30, a plurality of address electrodes 32 are arranged in a stripe shape, and the address electrodes 32 are embedded by a white back dielectric layer 34. The back dielectric layer 34 ) Serves to improve the luminous efficiency of the plasma display panel 10 by reflecting visible light emitted backward from the phosphor layer 38.

In addition, a plurality of barrier ribs 36 are formed on the upper surface of the rear dielectric layer 34 so as to be spaced apart from each other by a predetermined distance to prevent electrical and optical interference between the discharge cells 40. The phosphor layers 38 of red (R), green (G), and blue (B) are coated on the inner surface of the discharge cells 40 partitioned by a predetermined thickness, and Ne is discharged in the discharge cells 40. , Xe or a mixed discharge gas thereof is injected.

The front substrate 20 is made of glass as a transparent substrate through which visible light can pass, and is coupled to the rear substrate 30 on which the partition 36 is provided.

The bottom surface of the front substrate 20 is formed in a stripe shape orthogonal to the address electrodes 32 of the rear substrate 30, and a sustain electrode in which the scan electrode 22a and the sustain electrode 22b are paired. (22) is formed, and the sustain electrode 22 is mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light.

In order to reduce the line resistance of the sustain electrode 22, bus electrodes 24 made of metal are formed on the bottom of each of the sustain electrodes 22, and the bus electrodes 24 are formed on the sustain electrode 22. On the contrary, the width is narrow.

The sustain electrodes 22 and the bus electrodes 24 are buried by a transparent front dielectric layer 26. The front dielectric layer 26 functions to maintain wall discharge by accumulating wall charges generated during plasma discharge. .

In addition, a protective film layer 28 is formed on the bottom surface of the front dielectric layer 26. The protective film layer 28 prevents damage to the front dielectric layer 26 and the sustain electrode 22 by sputtering of plasma particles. And it discharges secondary electrons and serves to lower the discharge voltage and the sustain voltage, it is generally made of magnesium oxide (MgO) of 5000Å thickness.

The driving timing of the conventional AC plasma display panel 10 having the above configuration can be divided into a reset period, an address period, and a sustain period.

In the reset period, the charge state of each discharge cell 40 is initialized to smoothly perform the addressing operation on the discharge cell 40.

In the address period, an address discharge occurs between the address electrode 32 and one sustain electrode 22, that is, the Y electrode, in the selected discharge cell 40, and wall charges are accumulated at this time.

In the sustain period, sustain discharge occurs between the Y electrode and the other sustain electrode, that is, the X electrode, in the discharge cell 40 in which the wall charges are formed. In this sustain discharge, the phosphor layer 38 of the corresponding discharge cell 40 is excited by ultraviolet rays generated from the discharge gas, and visible light is emitted, and the visible light is emitted through the front substrate 20 so that the user can recognize it. To form an image.

However, in the conventional AC plasma display panel 10, when looking at the distribution of current consumed during discharge, energy required for accelerating ionic species is consumed by 70% or more, thereby greatly reducing the discharge efficiency.

That is, after discharge starts, ions are accelerated to the cathode and ultimately, many cations are present in the cathode. When the polarity of the anode and cathode is changed by the signal of the next cycle, they are accelerated to the opposite side to maintain the plasma or ultraviolet rays. Since it does not change into the excitation species that can be produced and is simply accelerated to consume energy, discharge efficiency is lowered due to excessive energy consumption, and thus there is a problem in that a limit is generated in reducing power consumption.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and by forming fine-sized balls on one surface of the front substrate in contact with the protective layer, a ball capable of lowering the discharge holding voltage and increasing the luminance can be obtained. A front substrate having a dielectric layer having a structure and a method of manufacturing the same; An object of the present invention is to provide a plasma display panel including the same.

According to an aspect of the present invention, there is provided a front substrate having a dielectric layer having a ball structure. A bus electrode formed at a bottom thereof to reduce the line resistance of the sustain electrode; Filling the sustain electrode and the bus electrode to accumulate wall charges generated during plasma discharge to maintain discharge, and a front dielectric layer having a plurality of balls having a minute depth and a minute diameter on one surface thereof; And a protective film layer deposited on one surface of the front dielectric layer on which the plurality of balls are formed to prevent damage to the front dielectric layer and the sustain electrode by sputtering of plasma particles and to emit secondary electrons.

In this case, the plurality of balls may be formed on only one surface of the front surface dielectric vertically corresponding to the sustain electrode, and the front surface vertically corresponding to any one of the scan electrode and the sustain electrode constituting the sustain electrode. It may be formed only on one surface of the dielectric material, or may be formed only on one surface of the front surface dielectric that is perpendicular to the sustain electrode.

In addition, the plurality of balls, the gap between the upper end and the diameter of the bottom surface is made of a narrow upper and lower narrow (上 廣 下 狹) form, the depth (H) of 1 ~ 20㎛, the diameter (D) of the bottom surface It is preferable to form in the size which is 1-20 micrometers.

Moreover, it is preferable that the inclinations H / W of the said several ball side surface are 0.3 or more.

On the other hand, the manufacturing method of the front substrate having the dielectric layer of the ball structure according to the present invention, (A) forming a sustain electrode and the front dielectric layer on the front substrate; (B) forming a plurality of balls having a fine depth and a fine diameter on one surface of the front dielectric layer; (C) depositing a protective film layer on one surface of the front dielectric layer in which the plurality of balls are formed.

Wherein (B) step, (B-1) is a step of coating a mixture of PMMA beads and the paste of the front dielectric in an appropriate ratio on one surface of the front dielectric layer by spin coating; (B-2) After the step (B-1), it is preferable to form a plurality of balls on one surface of the front dielectric layer by removing the PMMA beads by firing.

In this case, it is preferable to apply the said PMMA beads whose diameter is 5-7 micrometers.

On the other hand, the step (B), (B'-1) is a step of applying a coating of a mixture of Al ₂ O ₃ and the paste of the front surface dielectric in an appropriate ratio on one surface of the front surface dielectric layer; (B′-2) After the step (B′-1), the Al ₂ O ₃ may be removed by firing to form a plurality of balls on one surface of the front dielectric layer.

In addition, the step (B) is (B ″ -1) applying a spin coating of a mixture of the patterned polyimide and the paste of the front side dielectric at an appropriate ratio on one surface of the front side dielectric layer; (B ″ -2) After the step (B ″ -1), the plurality of balls may be formed on one surface of the front dielectric layer by removing the patterned polyimide by firing.

On the other hand, the plasma display panel including a front substrate having a dielectric layer of the ball structure according to the present invention, the front substrate configured as described above; Phosphor coated on the inner surface of the discharge cells partitioned by address electrodes arranged in a stripe form orthogonal to the sustain electrode of the front substrate, a back dielectric layer filling the address electrode, and partition walls formed at regular intervals on the top surface of the back dielectric layer. It characterized in that it comprises a back substrate having a layer.

As described above, the front substrate having a dielectric layer having a ball structure and a method of manufacturing the same; According to the plasma display panel including the same, fine sized balls are formed on one surface of the dielectric layer of the front substrate to be in contact with the passivation layer, so that the discharge sustain voltage is lowered and the brightness is increased to maximize the discharge efficiency. There is.

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

3A to 3C are views sequentially illustrating a process of manufacturing a front substrate having a front dielectric layer having a ball structure according to an embodiment of the present invention, and FIG. 4 is a front view of a ball structure according to an embodiment of the present invention. It is a process chart which shows schematically the manufacturing process of a front substrate which has a dielectric layer.

In addition, Figure 5 is a cross-sectional view showing a structure in which the ball is formed on the front dielectric layer in the front substrate according to the present invention, Figure 6 is a picture of the structure in which the ball is formed on the front dielectric layer in accordance with the present invention, Figure 7 is a protective film layer in Figure 6 This is an enlarged view of the ball structure in the deposited state,

In describing an embodiment of the present invention, the same parts as in the prior art will be described with the same reference numerals, and repeated description thereof will be omitted.

The AC plasma display panel 10 according to the present invention includes a rear substrate 30 and a front substrate 20 in the same manner as the conventional plasma display panel 10.

An address electrode 32, a back dielectric layer 34, a partition 36, and a phosphor are sequentially stacked on the back substrate 30. The front substrate 20 includes a sustain electrode 22 and a bus electrode 24. The electrode layer, the front dielectric layer 26, and the protective film layer 28 made up are sequentially stacked.

An inert gas such as He, Ne, Xe, Ar, or the like is sealed between the rear substrate 30 and the front substrate 20.

On one surface on which the protective layer 28 is deposited on the front dielectric layer 26 of the front substrate 20, a plurality of bowls 100 having fine diameters and fine depths are formed.

Here, the ball 100, as shown in Figure 5, the interval between the upper end and the diameter of the bottom is made of a narrow upper and lower narrow (上 廣 下 狹) form, wherein the ball 100 is the depth (H) Is 1 ~ 20㎛, the bottom diameter (D) of the ball 100 is preferably formed in a size of 1 ~ 20㎛, the depth (H) of the ball 100 is most preferably formed of 2 ~ 3㎛ desirable.

On the other hand, since the shape of the ball 100 is formed in the upper and lower narrow shape, the side surface is formed to be inclined toward the bottom surface, the inclination (H / W) at this time is preferably 0.3 or more.

A method of manufacturing the front substrate 20 having the dielectric layer having the ball 100 structure as described above is as follows.

First, the sustain electrode 22 and the front dielectric layer 26 are formed on the front substrate 20. That is, after coating ITO or SnO ₂ on the front substrate 20, the sustain electrode 22 is patterned by photolithography, and the like, and the photosensitive Ag paste is printed on the sustain electrode 22, followed by photolithography. After the narrow bus electrode 24 is patterned, glass powder paste is printed on the sustain electrode 22 by screen printing to form a transparent front dielectric layer 26.

After forming and firing the sustain electrode 22 and the front dielectric layer 26 on the front substrate 20 as described above, the ball 100 is formed on one surface of the protective layer 28 deposited on the front dielectric layer 26. .

A process of forming the ball 100 on one surface of the front dielectric layer 26 will be described with reference to FIGS. 4A to 4C.

First, on one surface of the front dielectric layer 26 to form the ball 100, as shown in Fig. 3b, the front dielectric of PMMA beads (Polymethyl Methacrylate Beads) 50 having a particle size of about 5 ~ 7㎛ After the paste is applied, it is applied to one surface of the front dielectric layer by spin coating. At this time, only a part of the PMMA beads is buried in one surface of the front dielectric layer, and the other part is exposed to the outside.

Next, when it is fired again, the PMMA beads 50 are removed and a plurality of balls 100 are formed on one surface of the front dielectric layer 26, as shown in FIG. 3C.

When the protective layer 28 is deposited on the front dielectric layer 26 on which the balls 100 are formed, the manufacturing of the front substrate 20 is completed.

For reference, a paste of the front dielectric is applied to Al ₂ O ₃ grains or patterned polyimide grains in place of the PMMA beads 50, and then coated with a spin coating, followed by firing, and then firing the front dielectric layer 26. It is also possible to form a plurality of balls 100 on one surface of.

On the other hand, the back substrate 30 may be made the same as the known method of manufacturing the back substrate 30, the general known manufacturing method is as follows.

One part of the rear substrate 30 is drilled with holes having a diameter of 1 mm for encapsulation and gas encapsulation, and a photosensitive Ag paste is printed on the surface thereof and then patterned by photolithography. The address electrode 32 is coated with the rear dielectric layer 34. The partition 36 is formed between the address electrodes 32.

In this case, the partition 36 may be formed by a sand blasting method, a squeezing method, a photolithography method, or the like, in addition to the conventional screen printing method. The phosphor layer 38 is formed between the partition walls 36. The phosphor layer 38 is formed by discharging the photosensitive paste method and the ink containing the phosphor by using a printing method or a photosensitive solvent. The inkjet method etc. which form a phosphor pattern can be used.

Next, when the set of the front substrate 20 and the back substrate 30 is completed as described above, after combining the two substrate sets in the same manner as the manufacturing method of a conventional plasma display panel, the vacuum exhaust process and gas injection process, etc. In this case, the plasma display panel 10 may be manufactured.

FIG. 8 is a cross-sectional view of the plasma display panel manufactured by the manufacturing method as described above, wherein the discharge efficiency is increased by the plurality of balls 100 formed on the front dielectric layer 26 of the front substrate 20. The result of the experiment is derived from the reduced power.

Two test panels having a 13.5% Xe content and a cell pitch of 1.08 mm are provided, and one test panel has the front dielectric layer 26 having a flat structure as in the prior art, and the other test panel is provided with the present invention. A plurality of ball 100 structures were formed on the front dielectric layer 26 to measure a minimum holding voltage.

As a result, as shown in FIG. 9, in the conventional test panel without the structure of the ball 100 in the front dielectric layer 26, the minimum holding voltage was measured at 178 V. As shown in FIG. In the test panel having the (100) structure, the minimum holding voltage was measured to be 150 V. When the ball 100 structure is present in the front dielectric layer 26 as in the present invention, it can be seen that the discharge voltage is lowered by 20 V or more.

Meanwhile, a test panel in which the ball 100 is not formed in the front dielectric layer 26 and a test panel in which the ball 100 is formed in the front dielectric layer 26 are compared with the same voltage (V) under the same conditions. As a result, the measurement was almost similar to that shown in FIG. 10).

In addition, a test panel in which the ball 100 is not formed in the front dielectric layer 26 and a test panel in which the ball 100 is formed in the front dielectric layer 26 are measured with respect to the same voltage (V) under the same conditions. As a result, as shown in FIG. 11, the luminance was measured higher in the test panel in which the ball 100 was formed in the front dielectric layer 26.

On the basis of the above measurement results of the output density and luminance, the luminous efficiency of the panel in which the ball 100 is not formed in the front dielectric layer 26 and the panel in which the ball 100 is formed in the front dielectric layer 26 is measured. As a result, as shown in FIG. 12, the maximum value of luminous efficiency is 3.181 m / W in the panel in which the ball 100 is formed in the front dielectric layer 26, and the ball 100 is formed in the front dielectric layer 26. The maximum value of luminous efficiency was 2.411 m / W in the non-paneled panel. When the ball 100 is formed in the front dielectric layer 26, the luminous efficiency is about 32 compared to the conventional panel in which the ball 100 is not formed. It can be seen that the percent increase.

13A to 13C illustrate a front substrate 20 having a dielectric layer having a ball 100 structure according to another exemplary embodiment of the present invention.

Here, FIG. 13A is a view showing that the balls 100 are formed only at a portion perpendicular to the sustain electrode 22 on one surface of the front dielectric layer 26, and FIG. 13B is a view illustrating one of the two sustain electrodes 22. The ball 100 is formed only in a portion perpendicular to the one sustain electrode 22, Figure 13c is a ball 100 is formed only on the other surface except the portion perpendicular to the sustain electrode 22 It is a figure which shows that.

As described above, the balls 100 are formed on the front dielectric layer 26 in various forms, and as a result of experiments on the minimum holding voltage, the output density, the luminance, and the luminous efficiency compared to the same voltage, as described above, one embodiment of the present invention is performed. As described in the example, there was no significant difference from the state in which the balls 100 were formed on the entire surface of the front dielectric layer 26, and showed better performance than the conventional test panel in which the balls 100 were not formed at all.

As described above, according to the present invention, in the case of the plasma display panel 10 in which the balls 100 having fine depths and diameters are formed in the front dielectric layer 26, the light emitting efficiency is improved by increasing the output density per unit area and the luminance. It also has the effect.

1 is a partial cutaway perspective view schematically showing a configuration of a conventional AC plasma display panel.

2 is a partial cross-sectional view of FIG. 1.

3A to 3C are rear perspective views sequentially illustrating a process of manufacturing a front substrate having a front dielectric layer having a ball structure according to the present invention.

Figure 4 is a process diagram schematically showing the manufacturing process of the front substrate having a front dielectric layer of the ball structure according to the present invention.

Figure 5 is a cross-sectional view showing a structure in which a ball is formed on the front dielectric layer in the front substrate according to the present invention.

Figure 6 is a photograph of the structure in which the ball is formed on the front dielectric layer in accordance with the present invention.

7 is an enlarged view of a ball structure in a state in which a protective film layer is deposited in FIG. 6.

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

FIG. 9 is a graph illustrating a result of experimenting with a minimum holding voltage using a test panel including a front substrate having a dielectric layer having a ball structure according to the present invention. FIG.

10 is a graph showing the results of experimenting with the same voltage output density using a test panel including a front substrate having a dielectric layer of a ball structure according to the present invention.

FIG. 11 is a graph illustrating the results of experimenting with brightness at the same voltage using a test panel including a front substrate having a dielectric layer having a ball structure according to the present invention. FIG.

12 is a graph showing the results of measuring luminous efficiency by the experimental results of FIGS. 10 and 11.

13A to 13C are rear perspective views illustrating a front substrate having a dielectric layer having a ball structure according to another exemplary embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

10: plasma display panel 20: front substrate

22: sustain electrode 22a: scan electrode

22b: sustain electrode 24: bus electrode

26: front dielectric layer 28: protective film layer

30: back substrate 32: address electrode

34 back dielectric layer 36 partition wall

38 phosphor layer 40 discharge cell

50: PMMA Beads 100: Ball

Claims (12)

A sustain electrode through which visible light is transmitted and formed in pairs in a stripe form; A bus electrode formed at a bottom thereof to reduce the line resistance of the sustain electrode; By embedding the sustain electrode and the bus electrode to accumulate wall charges generated during plasma discharge to maintain the discharge, on one surface there are a plurality of balls having a fine depth of 1 ~ 20㎛, a diameter of a fine bottom surface of 1 ~ 20㎛ A front dielectric layer formed; The dielectric layer having a ball structure, which includes a protective film layer deposited on one surface of the front dielectric layer on which the plurality of balls are formed, to prevent damage to the front dielectric layer and the sustain electrode by sputtering of plasma particles and to emit secondary electrons. Front substrate. The method of claim 1, The plurality of balls, the front substrate having a dielectric layer having a ball structure, characterized in that formed on only one surface of the front surface dielectric perpendicular to the sustain electrode. The method of claim 1, And the plurality of balls are formed on only one surface of a front surface dielectric perpendicular to any one of scan electrodes and sustain electrodes constituting the sustain electrode. The method of claim 1, The plurality of balls, the front substrate having a dielectric layer having a ball structure, characterized in that formed on only the surface except one surface of the front surface dielectric perpendicular to the sustain electrode. The method of claim 1, The plurality of balls, the front substrate having a dielectric layer having a ball structure, characterized in that formed in the form of a light-emitting sub-single with a wide gap between the upper end and a narrow diameter of the bottom. delete delete In the method of manufacturing the front substrate according to any one of claims 1 to 5, (A) forming a sustain electrode and a front dielectric layer on the front substrate; (B) forming a plurality of balls on one surface of the front dielectric layer having a fine depth of 1 ~ 20㎛, the diameter of the fine bottom surface of 1 ~ 20㎛; (C) depositing a protective film layer on one surface of the front dielectric layer in which the plurality of balls are formed, Step (B) is, (B-1) spin coating a mixture of PMMA beads and a paste of the front dielectric at an appropriate ratio on one surface of the front dielectric layer so that a part of the PMMA beads is embedded on one surface of the front dielectric layer and the other is exposed to the outside; ; (B-2) after the step (B-1), removing the PMMA beads by firing to form a plurality of balls on one surface of the front dielectric layer, the front substrate having a dielectric layer having a ball structure Manufacturing method. The method of claim 8, And said PMMA beads have a diameter of 5 to 7 mu m. In the method of manufacturing the front substrate according to any one of claims 1 to 5, (A) forming a sustain electrode and a front dielectric layer on the front substrate; (B) forming a plurality of balls on one surface of the front dielectric layer having a fine depth of 1 ~ 20㎛, the diameter of the fine bottom surface of 1 ~ 20㎛; (C) depositing a protective film layer on one surface of the front dielectric layer in which the plurality of balls are formed, Step (B) is, (B'-1) was spin-coated to a coating a dielectric paste on front of Al ₂ O ₃ grains on one surface of the front dielectric layer portion of the Al ₂ O ₃ grains are embedded in the one surface of the front dielectric layer is a remainder portion outside To be exposed; (B′-2) after the step (B′-1), the ball structure is formed by removing the Al ₂ O ₃ grains by firing to form a plurality of balls on one surface of the front dielectric layer. Method of manufacturing a front substrate having a dielectric layer. (A) forming a sustain electrode and a front dielectric layer on the front substrate; (B) forming a plurality of balls on one surface of the front dielectric layer having a fine depth of 1 ~ 20㎛, the diameter of the fine bottom surface of 1 ~ 20㎛; (C) depositing a protective film layer on one surface of the front dielectric layer in which the plurality of balls are formed, Step (B) is, (B ″ -1) On one side of the front side dielectric layer, spin coating a paste of the front side dielectric onto patterned polyimide grains so that some of the polyimide grains are embedded on one side of the front side dielectric layer and others are exposed to the outside. Making it possible; (B ″ -2) After the step (B ″ -1), the ball structure is formed by removing the patterned polyimide grains by firing to form a plurality of balls on one surface of the front dielectric layer. Method of manufacturing a front substrate having a dielectric layer. The front substrate according to any one of claims 1 to 5; Phosphor coated on the inner surface of the discharge cells partitioned by address electrodes arranged in a stripe form orthogonal to the sustain electrode of the front substrate, a back dielectric layer filling the address electrode, and partition walls formed at regular intervals on the top surface of the back dielectric layer. A plasma display panel comprising a front substrate having a dielectric layer having a ball structure, comprising a back substrate having a layer.

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