KR20070109217A - A plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve the light efficiency and contrast by emitting the light output from phosphor using a photochromic glass, without losing the light. A plasma display panel includes a lower substrate with address electrodes, and a photochromic glass(70') disposed on the lower substrate, with barrier ribs being interposed between the lower substrate and the glass. The photochromic glass contains Ag halogen compound. If the photochromic glass is irradiated by ultraviolet rays, the Ag halogen compound is separated into silver colloid and halogen, and the silver colloid is discolored.

Description

Plasma display panel {A plasma display panel}

1 is a cross-sectional view of an embodiment of a discharge cell structure of a plasma display panel,

FIG. 2 is a first embodiment of part A of FIG. 1,

3 is a second embodiment of part A of FIG.

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

10 lower glass 20 address electrode

30: lower plate dielectric 40: partition wall

50a, 50b, 50c: phosphor 60: discharge gas

70: top glass 80a, 80b: transparent electrode

80a ', 80b': Bus electrode 90: Top dielectric

100: protective film 110: front filter

70 ', 110': Photochromic glass 110a: EMI shielding film

110b: NIR shielding film 110c: antireflective film

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), which is one of new image display devices in the multimedia era, and more particularly, to a top glass or a front filter of a plasma display panel.

With the advent of the multimedia era, display devices that can express more detailed, larger, and more natural colors are required. However, the current CRT (Cathode Ray Tube) has a limit to compose a large screen of 40 inches or more, and the LCD (Liquid Crystal Display), PDP (Plasma Display Panel), and projection TV (Television) are used for high definition video. It is rapidly developing for expansion.

Hereinafter, a problem of the PDP, which is one of the above-described display apparatuses, and a problem thereof will be described.

The PDP has a lower plate having an address electrode, a top plate having a sustain electrode pair, and a discharge cell defined by a partition wall, and phosphors are coated in the discharge cell to display a screen. Specifically, when discharge occurs in the discharge space between the upper plate and the lower plate, ultraviolet rays generated at this time are incident on the phosphor to generate visible light, and the screen is displayed by the visible light.

A front filter is provided on the front side of the PDP. The front filter shields electromagnetic waves (EMI) and near infrared rays (NIR) and prevents color correction and reflection of light incident from the outside.

However, the above-described conventional plasma display panel and its electromagnetic shielding film have the following problems.

First, an anti-reflection film forming an electromagnetic shielding film absorbs up to about 50% of visible light emitted from a discharge cell, thereby lowering the light efficiency of the PDP.

Second, as described above, the front filter is formed including the electromagnetic wave shielding film, the near-infrared shielding film, the color correction film, and the anti-reflective film, thereby increasing the thickness and weight.

The present invention is to solve the above problems, an object of the present invention is to provide a plasma display panel with improved light efficiency.

Another object of the present invention is to provide a plasma display panel including a front filter having a thin thickness and a light weight.

In order to achieve the above object, the present invention is a lower plate provided with an address electrode; And an upper plate contacting the lower plate and the partition wall therebetween and provided with photochromic glass.

Preferably, the photochromic glass is characterized in that it comprises a silver (Ag) halogen compound.

More preferably, when the ultraviolet light is irradiated onto the photochromic glass, the silver halogen compound is separated into silver colloid and halogen, and the silver colloid is discolored. It is characterized by forming a halogen compound and returning to the color before discoloration.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

The same components as in the prior art are given the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

1 is a cross-sectional view of an embodiment of a discharge cell structure of a plasma display panel, FIG. 2 is a first embodiment of part A of FIG. 1, and FIG. 3 is a second embodiment of part A of FIG. Hereinafter, embodiments of the plasma display panel according to the present invention will be described with reference to FIGS. 1 to 3.

The plasma display panel according to the present invention has a lower plate having an address electrode 20, an upper plate having sustain electrode pairs 80a and 80b, and discharge cells Red, Green, and Blue defined by the partition wall 40. Phosphors 50a, 50b, and 50c are provided in the discharge cell. Discharge occurs in the discharge space between the upper plate and the lower plate, and ultraviolet (UV) generated from the discharge gas 60 is incident on the phosphors 50a, 50b, and 50c to generate red, green, and blue visible light. The screen is displayed by the visible light.

Specifically, when discharge occurs in the above-described discharge cell of the plasma display panel, the discharge gas 60 becomes a plasma state and vacuum ultraviolet rays are generated. The phosphor layers 50a, 50b, and 50c are excited by the above-described vacuum ultraviolet rays to generate visible light, and the visible light is emitted to the outside through the upper plate glass 70 to display an image.

In this case, the above-mentioned visible light is absorbed while passing through the front filter 110 provided on the front surface of the upper glass 70, the upper glass 70 or the front filter 110 of the plasma display panel according to the present invention. Is made to reduce the absorption of visible light, the structure will be described later.

2 and 3 are enlarged views of a portion A in which the upper plate glass 70 and the front filter 110 are shown in FIG. 1. In FIG. 2, part A includes a photochromic glass 70 ′, an EMI shielding film 110a, a near infrared shielding film 110b, and an antireflection film 110c. In this embodiment, the photochromic glass 70 'is used as the upper glass, that is, the upper glass of the plasma display panel is made of the photochromic glass 70'.

Photochromic glass is a glass whose color changes with the intensity of light. Specifically, the photochromic glass 70 'described above is generally colorless, and is discolored to black or the like when ultraviolet rays (UV) are incident. The above-mentioned ultraviolet ray is preferably a vacuum ultraviolet ray (VUV) generated when the discharge gas becomes a plasma state. In addition, in order to prevent the photochromic glass 70 'from being discolored by the visible light emitted from the phosphor or the visible light incident from the outside of the panel, the above-described photochromic glass 70' is incident to the visible light. It is preferable not to react even if it does.

Preferably, the photochromic glass 70 'is made of an inorganic compound or an organic compound, an inorganic compound includes a silver halogen compound, and the like, and various organic hydrazones are used. The process for preparing the photochromic glass is as follows. First, the glass raw material powder is prepared, and the inorganic / organic compound described above is prepared. Subsequently, the glass raw material powder and the inorganic / organic compound are mixed, melt-baked at a high temperature and press-molded to produce a predetermined shape, and then the press-molded glass is cut. On the photochromic glass 70 'used as the upper plate glass, a front filter made of an EMI shielding film 110a, an NIR shielding film 110b, an antireflection film 110c, or the like is bonded. Although not shown in the drawing, the front filter described above is preferably a film filter formed on a polyethylene terephthalate resin (PET) or the like or a glass filter formed on a glass, and each layer is bonded by an adhesive such as PSA. desirable.

3 is an embodiment in which photochromic glass is attached on the top glass of the plasma display panel in the form of a glass front filter.

That is, a glass type front filter is formed on the soda-lime glass substrate or PD200 used as the upper plate glass 70. The glass front filter preferably includes an EMI shielding film 110a, an NIR shielding film 110b, an antireflective film 110c, and the like on the photochromic glass 110 '. Same as the above-described embodiment. The rest of the structure except for the above-mentioned top glass or front filter is the same as that of the conventional plasma display panel.

Referring to the operation of the embodiments of the plasma display panel according to the present invention described above are as follows.

When ultraviolet rays are driven to the top glass or the photochromic glass included in the glass filter during the discharge of the plasma display panel, the color change is reversibly depending on the light intensity. Specifically, when ultraviolet rays are irradiated, the silver halogen compound in the photochromic glass is separated into silver colloid and halogen, and the silver colloid is discolored, causing the photochromic glass to change color. Therefore, color changes to color to have high reflectance and transmittance so that light emitted from the phosphor is emitted to the outside without loss to display an image to improve light efficiency and contrast. When ultraviolet rays are blocked for a predetermined time after the ultraviolet rays are irradiated on the photochromic glass, the silver colloid and the halogen form a halogen compound, and the photochromic glass returns to the color before discoloration. In addition, since the photochromic glass does not cause a chemical reaction when the visible light is irradiated, the photochromic glass does not react with the visible light incident from the outside of the panel.

The present invention is not limited to the above-described embodiments, and such modifications are included in the scope of the present invention even if modifications are possible by those skilled in the art to which the present invention pertains.

The effects of the plasma display panel according to the present invention described above are as follows.

First, the optical efficiency of the plasma display panel can be significantly improved.

Second, the front filter of the plasma display panel can be made thinner and lighter in weight.

Claims (10)

A lower plate having an address electrode; And And a top plate in contact with the bottom plate and the partition wall therebetween and provided with photochromic glass. The method of claim 1, wherein the photochromic glass, A plasma display panel comprising a silver (Ag) halogen compound. The method of claim 2, When the ultraviolet light is irradiated on the photochromic glass, the silver halogen compound is separated into silver colloid and halogen, and the silver colloid discolors. The method of claim 3, wherein And when the ultraviolet ray is blocked for a predetermined time after the ultraviolet ray is irradiated onto the photochromic glass, the silver colloid and the halogen form a halogen compound to return to the color before discoloration. The method of claim 1, wherein the photochromic glass, Plasma display panel, characterized in that when irradiated with visible light does not cause a chemical reaction. The method of claim 1, And the upper plate glass is made of the photochromic glass. The method of claim 1, wherein the photochromic glass, Plasma display panel, characterized in that formed on the top glass in the form of a front filter. The method according to claim 6 or 7, And an electromagnetic wave shielding film provided on the upper plate and shielding electromagnetic waves. The method according to claim 6 or 7, And a near infrared shielding film provided on the upper plate and shielding near infrared rays. The method according to claim 6 or 7, And an antireflection film provided on the upper plate and absorbing light incident from the outside of the panel.

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