KR20060092596A - Plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, wherein a dielectric film having a different dielectric constant is formed on an upper substrate surface facing each of red, green, and blue phosphors, or a dielectric film having a different thickness is formed to optimize capacitance of a discharge space. The driving margin can be increased and the luminous efficiency can be increased.

Dielectric, capacitance, dielectric constant, thickness, light emission

Description

Plasma display panel {Plasma display panel}

1 is a schematic cross-sectional view illustrating a structure of a general plasma display panel.

2 is a conceptual cross-sectional view for explaining the structure of a plasma display panel according to a first embodiment of the present invention.

3 is a conceptual cross-sectional view for explaining the structure of a plasma display panel according to a second embodiment of the present invention.

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

100: lower substrate 110: partition wall

115a, 115b, 115c: discharge space 121, 122, 123: phosphor

200: upper substrate 211: sustain electrode

212 scan electrode 221 222 223 dielectric film

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to form a dielectric film having a different dielectric constant or a dielectric film having a different thickness on the upper substrate surface facing the red, green, and blue phosphors, respectively. The present invention relates to a plasma display panel capable of optimizing capacity and increasing driving margin and increasing luminous efficiency.

Plasma display panels are large and thin, and many applications are expected such as wall-mounted TVs, displays for home theaters, and monitors for workstations.

The operation principle of the plasma display panel is caused by the energy difference when the ultraviolet rays generated from the plasma (Plasma) during the discharge of the He + Ne or Ne + Xe gas stimulate the phosphor and the phosphor electrons return from the excited state to the ground state. It is an element which displays an image using visible light.

One of the major influences on the plasma display panel having such a principle of operation is the discharge between the electrodes.

This discharge has a great influence on the luminance of the device. In a plasma display panel, discharge is generally classified into three types.

First, the discharge is a write discharge for the first discharge, the second discharge is a sustain discharge to maintain the discharge of the lighted discharge cell, and the third discharge stops the sustain of the sustained discharge cell. Is an erase discharge.

The write discharge is also referred to as address discharge.

The discharge is closely related to the dielectric formed on the electrode, which will be described below with reference to FIG. 1.

FIG. 1 is a schematic cross-sectional view illustrating a structure of a general plasma display panel. Referring to the structure of a plasma display panel, the lower substrate 10 and the upper substrate 20 are sealed such as frit glass. Zero bonded; Barrier ribs 11 are formed on the lower substrate 10 at regular intervals; An address electrode 12, a white dielectric layer 13 surrounding the address electrode 12, and a phosphor coated on the white dielectric layer 13 on the lower substrate 10 between the partitions 11. (14) are formed sequentially; A sustain electrode 21 and a scan electrode 22 are formed below the upper substrate 20; Bus electrodes 23 are formed below the sustain electrodes and the scan electrodes 21 and 22 to prevent voltage drops due to resistance; A dielectric layer 24 is formed below the upper substrate 20 to surround the sustain electrodes, the scan electrodes 21, 22 and the bus electrodes 23 to protect the electrodes from discharge; The protective layer 25 is formed on the dielectric layer 24 to protect the dielectric layer 24 and emit surface electrons to lower the discharge voltage.

The plasma display panel configured as described above is manufactured by injecting a mixture of xenon (Xe) and neon (Ne) into the discharge space after removing the air inside the discharge space.

That is, the plasma display panel is manufactured by providing a dielectric layer on two substrates, a partition wall and a phosphor layer dividing a discharge space on one side, and encapsulating an inert gas therein.

In this case, the light emitting display is composed of converting ultraviolet rays generated when a plasma discharge is generated therein into visible light.

The dielectric layer is formed by printing / firing a paste prepared from a low melting glass powder, and serves to maintain wall discharge by accumulating wall charges generated during plasma discharge.

Since the top dielectric is a portion through which visible light is transmitted, transparency is required, and it is required to have an appropriate dielectric constant value in connection with discharge.

Conventionally, a dielectric having a fixed dielectric constant is formed on a substrate, but the phosphors formed in the discharge space formed by the partition walls have different dielectric constants and coating thicknesses, and thus, electrical properties of the discharge space vary greatly.

Therefore, if the same driving pulse is applied to the conventional panel, the conditions under which light emission is generated in each discharge space are not optimized, which leads to a decrease in driving margin and deterioration of the panel luminous efficiency.

In order to solve the above problems, the present invention provides a dielectric film having a different dielectric constant or a dielectric film having a different thickness on the upper substrate surface facing the red, green and blue phosphors, respectively, to form a capacitance of the discharge space. It is an object of the present invention to provide a plasma display panel which can increase the driving margin by optimizing and increase the luminous efficiency.

According to a preferred aspect of the present invention, there is provided a plasma display panel in which a space is formed between two substrates and is bonded to each other so that a plasma discharge is generated in the space to emit light.

A barrier rib is formed on one substrate, and a plurality of discharge spaces surrounded by the barrier rib are formed, and any one of red, green, and blue phosphors is coated inside the discharge spaces, and the red, green, and blue phosphors are coated. Plasma display panels are provided, wherein dielectric films having different dielectric constants are formed on different substrate surfaces facing each other.

Another preferred aspect for achieving the above object of the present invention is a plasma display panel in which a certain space is formed between two substrates and is bonded to each other, where plasma discharge is generated to emit light.

A barrier rib is formed on one substrate, and a plurality of discharge spaces surrounded by the barrier rib are formed, and any one of red, green, and blue phosphors is coated inside the discharge spaces, and the red, green, and blue phosphors are coated. A plasma display panel is provided, wherein dielectric films having different thicknesses are formed on different substrate surfaces facing each other.

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

FIG. 2 is a conceptual cross-sectional view illustrating a structure of a plasma display panel according to a first embodiment of the present invention. The partition wall 110 is formed on the lower substrate 100 of the plasma display panel, and the partition wall 110 is formed. A plurality of discharge spaces (115a, 115b, 115c) surrounded by the () is formed, the red, green and blue phosphors (121, 122, 123) are coated in the discharge spaces (115a, 115b, 115c).

In addition, a sustain electrode 211 and a scan electrode 212 are formed on the upper substrate 200 to be bonded to the lower substrate 100, and the sustain electrode 211 and the scan electrode 212 are formed. ), Dielectric films 221, 222, and 223 are formed.

The first embodiment of the present invention is characterized in that the dielectric films 212, 222, and 223 formed on the upper substrate surface facing the red, green, and blue phosphors 121, 122, and 123 respectively have different dielectric constants.

In more detail, since the dielectric constants of the red, green, and blue phosphors are different, and the areas and thicknesses applied to the discharge spaces are different, driving margins are reduced due to differences in electrical properties in the discharge spaces, and panel emission efficiency is lowered. In the first embodiment of the present invention, since the dielectric constants of the dielectric layers formed on the upper substrate 200 may be different, the capacitance may be uniform to optimize the light emission condition, thereby increasing driving margin and emitting light. The efficiency can be increased.

That is, the higher the dielectric constant, the more electric energy for driving the plasma display panel is supplied, the more the discharge and the brightness is increased.

Therefore, if the dielectric constant is formed highest in the dielectric film facing the blue phosphor, which is relatively lower in brightness than the red and green phosphors, the luminous efficiency can be increased in the discharge space in which the blue phosphor is present.

Accordingly, in the first embodiment of the present invention, in a plasma display panel in which a certain space is formed between two substrates and is bonded to each other, a plasma discharge is generated to emit light. A plurality of enclosed discharge spaces are formed, and any one of red, green, and blue phosphors is coated inside the discharge spaces, and different dielectric constants are provided on different substrate surfaces facing the red, green, and blue phosphors. It is characterized in that dielectric films having a structure are formed.

3 is a conceptual cross-sectional view illustrating a structure of a plasma display panel according to a second embodiment of the present invention. In the second embodiment of the present invention, upper substrates facing red, green, and blue phosphors 121, 122, and 123, respectively, are illustrated. The thicknesses of the dielectric films 212, 222, and 223 formed on the surface may be different from each other.

Since the thickness and capacitance of the dielectric film are inversely proportional to each other, by controlling the thickness of the dielectric film, the luminous efficiency of the red, green, and blue phosphors may be optimized.

That is, when the thickness of the dielectric film facing the blue phosphor having low luminance is made thinner than the thickness of the dielectric film facing the red and green phosphors, the light emission efficiency may be increased in the discharge space in which the blue phosphors exist.

Therefore, in the second embodiment of the present invention, in a plasma display panel in which a certain space is formed between two substrates and is bonded to each other, a plasma discharge is generated to emit light. A plurality of enclosed discharge spaces are formed, and any one of red, green, and blue phosphors is coated inside the discharge spaces, and different thicknesses are provided on different substrate surfaces facing the red, green, and blue phosphors. It is characterized in that the dielectric films having are formed.

When forming a dielectric film having a different dielectric constant as described above, a green sheet having a different dielectric constant is laminated on the surface, or sputtering or an E-beam process is performed.

In addition, different thicknesses of the dielectric film may be formed by forming the dielectric film by various processes such as a printing process, a green sheet laminating process, a sputtering process, and an e-beam process, followed by etching before or after firing.

The dielectric film is formed of a material containing any one of PbO, ZnO, Bi ₂ O ₃ , P ₂ O ₅ , SiO ₂ , TiO ₂ , Al ₂ O ₃ , Nd ₂ O ₃ , CoC, and CuO.

In addition, the dielectric film is preferably formed of a dielectric film having a dielectric constant of 4 to 20.

As described above, the present invention forms a dielectric film having a different dielectric constant on the upper substrate surface facing each of the red, green and blue phosphors, or forms a dielectric film having a different thickness to optimize the capacitance of the dustproof space. There is an effect that can increase the margin and increase the luminous efficiency.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (6)

A plasma display panel which forms a space between two substrates and is bonded to each other, in which plasma discharge is generated to emit light, A barrier rib is formed on one substrate, and a plurality of discharge spaces surrounded by the barrier rib are formed, and any one of red, green, and blue phosphors is coated inside the discharge spaces, and the red, green, and blue phosphors are coated. Plasma display panel, characterized in that dielectric films having different dielectric constants are formed on different substrate surfaces facing each other. A plasma display panel which forms a space between two substrates and is bonded to each other, in which plasma discharge is generated to emit light, A barrier rib is formed on one substrate, and a plurality of discharge spaces surrounded by the barrier rib are formed, and any one of red, green, and blue phosphors is coated inside the discharge spaces, and the red, green, and blue phosphors are coated. Plasma display panel, characterized in that dielectric films having different thicknesses are formed on different substrate surfaces facing each other. The method according to claim 1 or 2, The dielectric film, Plasma display comprising PbO, ZnO, Bi ₂ O ₃ , P ₂ O ₅ , SiO ₂ , TiO ₂ , Al ₂ O ₃ , Nd ₂ O ₃ , CoC and CuO panel. The method according to claim 1 or 2, The dielectric film, A plasma display panel comprising a dielectric film having a dielectric constant of 4 to 20. The method of claim 1, And a dielectric constant of the dielectric film facing the blue phosphor is greater than the dielectric films facing the red and green phosphors. The method of claim 2, The thickness of the dielectric film opposite to the blue phosphor is And a thickness thinner than a thickness of a dielectric film opposing the red and green phosphors.

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