KR100516935B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel in which a front filter is formed directly on the top glass.

The plasma display panel according to the present invention includes a panel and a front filter including at least one deposition film deposited directly on the front surface of the panel.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which a front filter is directly formed on a top glass.

Plasma Display Panels (hereinafter referred to as "PDPs") are characterized by emitting phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe. An image containing graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view illustrating a discharge cell structure of a conventional plasma display panel.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a scan electrode Y and a sustain electrode Z formed on the upper substrate 10, and an address electrode formed on the lower substrate 18. X). Each of the scan electrode Y and the sustain electrode Z has a line width smaller than the line widths of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z and is formed at one edge of the transparent electrode 13Y, 13Z).

The transparent electrodes 12Y and 12Y are usually formed on the upper substrate 10 by indium tin oxide (ITO). The metal bus electrodes 13Y and 13Z are usually formed of metals such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode Y and the sustain electrode Z side by side. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode X is formed in the direction crossing the scan electrode Y and the sustain electrode Z. The partition wall 24 is formed in a stripe or lattice shape to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert mixed gas is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

The PDP is time-divisionally driven by dividing one frame into several subfields having different number of emission times in order to implement grayscale of an image. Each subfield is divided into an initialization period for initializing the full screen, an address period for selecting a scan line and selecting a cell in the selected scan line, and a sustain period for implementing gray levels according to the number of discharges.

For example, when the image is to be displayed with 256 gray levels, as shown in FIG. 2, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8. As described above, each of the eight subfields SF1 to SF8 is divided into an initialization period, an address period, and a sustain period. The initialization period and the address period of each subfield are the same for each subfield, while the sustain period is increased at a rate of 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. .

In the PDP driven as described above, a front filter is installed on the upper substrate 10 to shield electromagnetic waves and prevent reflection of external light.

3 is a cross-sectional view schematically illustrating one side of a conventional plasma display panel.

Referring to FIG. 3, a conventional PDP includes a panel 32 formed by joining an upper substrate 10 and a lower substrate 18, a front filter 30 installed on a front surface of the panel 32, and a panel ( 32, a printed circuit board 36 installed to be attached to the heat sink 34, a back cover 38 formed to surround the back of the PDP, and the front filter 30. And a filter support portion 40 for connecting the bag cover 38 and a support member 42 provided between the front filter 30 and the bag cover 38 so as to surround the filter support portion 40.

The printed circuit board 36 supplies a driving signal to the electrodes of the panel 32. To this end, the printed circuit board 36 includes various driving units not shown. The panel 32 displays a predetermined image in response to a drive signal supplied from the printed circuit board 36. The heat sink 34 dissipates heat generated from the panel 32 and the printed circuit board 36. The back cover 38 protects the panel 32 from external shocks and blocks electromagnetic waves emitted to the rear surface (hereinafter referred to as "EMI").

The filter support 40 electrically connects the front filter 30 to the bag cover 38. Such a filter support 40 grounds the front filter 30 to the bag cover 38 and prevents EMI from being emitted to the side. The support member 42 supports the filter support 40, the front filter 30, the bag cover 38, and the like.

The front filter 30 shields EMI and prevents reflection of external light. To this end, the front filter 30 is an antireflection film 50, an optical film 52, a glass 54, an EMI shielding film 56 and a near infrared (NIR) shielding film as shown in FIG. 58 is provided. Here, an adhesive layer is actually formed between the films 50, 52, 54, 56, and 58 of the front filter 30 to bond the films 50, 52, 54, 56, and 58. In general, the optical characteristic film 52 is formed by inserting a specific material into the adhesive layer. Then, the structure of the front filter 30 is slightly changed depending on the manufacturer. For convenience of description, the adhesive layer is not illustrated, and the optical characteristic film 52 is represented as a specific layer, and the structure of the front filter 30 which is generally used is given as an example.

The antireflection coating 50 prevents light incident from the outside from being reflected back to the outside to improve the contrast of the PDP. The antireflective film 50 is formed on the surface of the front filter 30. Meanwhile, the antireflection film 50 may be further formed on the rear surface of the front filter 30. The optical characteristic film 52 lowers the luminance of red (R) and green (G) among the light incident from the panel 32 and improves the optical characteristic of the PDP by increasing the luminance of blue (B).

The glass 54 prevents the front filter 30 from being damaged from an external impact. In other words, the glass 54 supports the front filter 30 to prevent the front filter 30 from being damaged from an external impact. The EMI shielding film 56 shields the EMI to prevent the EMI incident from the panel 32 from being emitted to the outside. The NIR shielding layer 58 shields the NIR radiated from the panel 32 to prevent the NIR above the reference from being emitted to the outside so that signals transmitted using the NIR such as a remote controller can be normally transmitted. Meanwhile, the EMI shielding film 56 and the NIR shielding film 58 may be composed of one layer.

The front filter 30 is electrically connected to the bag cover 38 through the filter support 40 as shown in FIG. 5. In detail, the filter support 40 is connected to the rear surface of the front filter 30 at one end of the front filter 30. In this case, the filter support 40 is electrically connected to at least one of the EMI shielding film 56 and the NIR shielding film 58. That is, the filter support 40 connects the front filter 30 to the bag cover 38 to shield EMI and / or NIR.

This conventional front filter 30 is used for the glass 54 to prevent the front filter 30 from being damaged by the impact from the outside. However, when the glass 54 is inserted into the front filter 30 in this way, the thickness of the front filter 30 becomes thick. In addition, when the glass 54 is inserted into the front filter 30, the weight becomes heavy and the manufacturing cost increases. In addition, there is a disadvantage that the panel 32 manufacturing process and the front filter 30 installation process are performed in a dual manner.

Therefore, the film type front filter 60 from which the glass 54 was removed as shown in FIG. 6 has been proposed. The film front filter 60 includes an antireflection film 62, an optical characteristic film 64, an EMI shielding film 66, and an NIR shielding film 68. Here, an adhesive layer is formed between the films 62, 64, 66, and 68 of the film front filter 60 to bond the films 62, 64, 66, and 68. In general, the optical characteristic film 64 is formed by inserting a specific material into the adhesive layer. In addition, the structure of the film-type front filter 60 is slightly changed depending on the company used. For convenience of description, the adhesive layer is not illustrated and the optical characteristic film 64 is represented as a specific layer.

The antireflective film 62 is formed on the surface of the film type front filter 60 to prevent the light incident from the outside from being reflected back to the outside. The antireflection film 62 may be further formed on the rear surface of the film type front filter 60. The optical characteristic film 64 lowers the luminance of red (R) and green (G) among the light incident from the panel 32 and increases the luminance of blue (B) to improve the optical characteristics of the PDP.

The EMI shielding film 66 shields the EMI to prevent the EMI incident from the panel 32 from being emitted to the outside. The NIR shielding film 68 shields the NIR incident from the panel 32. The NIR shielding film 68 prevents the NIR above the reference from being emitted to the outside so that signals transmitted from the remote controller or the like to the panel 32 can be normally transmitted. Meanwhile, the EMI shielding film 66 and the NIR shielding film 68 may be composed of one layer.

Such a film type front filter 60 has an advantage that the film is lighter and thinner than the front filter 30 including the glass 54. In addition, the film type front filter 60 may reduce the manufacturing cost compared to the front filter 30 including the glass 54. However, at present, when the film type front filter 60 is installed on the PDP, a laminating process is performed in which the release film attached to the adhesive surface of the film type front filter 60 is peeled off and then attached to the top glass of the PDP. . In this case, foreign matters may be mixed or bubbles may form in the adhesive region of the film type front filter 60 during the process, which may cause a defect of the PDP. In addition, there is a disadvantage in that the adhesive with a strong adhesive force.

Accordingly, it is an object of the present invention to provide a plasma display panel in which a front filter is directly formed on the top glass.

In order to achieve the above object, the plasma display panel of the present invention comprises a front filter including a panel and at least one deposition film deposited directly on the front surface of the panel. The at least one deposition film is an antireflection film. And an electromagnetic wave shielding film and a near-infrared shielding film. The anti-reflective film is formed on the outermost layer of the front filter. The near-infrared shielding film, the electromagnetic shielding film, and the anti-reflective film are sequentially deposited on the panel. And laminated.

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Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIG. 7.

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

Referring to FIG. 7, a PDP according to an embodiment of the present invention includes a panel 78 formed by joining an upper substrate and a lower substrate, and a front filter 70 formed by depositing a front surface of the panel 78. .

The front filter 70 includes an NIR shielding film 72, an EMI shielding film 74, and an antireflection film 76. Here, each of the films 72, 74, and 76 of the front filter 70 is sequentially formed on the upper substrate of the panel 78 by using a physical vapor deposition method such as sputter deposition or E-Beam deposition. The structure of the front filter 70 is slightly changed depending on the company used. In general, an optical film formed by inserting a specific material may be added. For convenience of description, the optical characteristic film is not shown in the present specification.

The NIR shielding film 72 is deposited directly on the upper substrate of the panel 78 to shield the NIR incident from the panel 78. The NIR shielding film 72 prevents the NIR above the reference from being emitted to the outside so that signals transmitted from the remote controller or the like to the panel 78 can be normally transmitted.

The EMI shield film 74 is deposited on the NIR shield film 72 to shield the EMI to prevent the EMI incident from the panel 78 from being emitted to the outside. Meanwhile, the EMI shielding film 74 and the NIR shielding film 72 may be composed of one layer.

The antireflective film 76 is formed on the top layer of the front filter 70 to prevent the light incident from the outside from being reflected back to the outside. The optical film, which can be deposited on the lower layer of the anti-reflective film 76, lowers the luminance of red (R) and green (G) among the light incident from the panel 78, and increases the luminance of blue (B) to increase the PDP. Improve the optical properties of the.

As described above, the PDP according to the exemplary embodiment of the present invention has an advantage that the front filter is directly formed on the upper substrate of the panel 78, so that the process is united with the manufacturing process of the panel 78. That is, the process of separately installing the front filter including the conventional glass on the support member of the PDP is not necessary, and a separate additional process of peeling off the release film of the conventional film type front filter and laminating it on the panel 78 of the PDP is required. Will not. Accordingly, when the film-type front filter is laminated on the PDP panel 78, foreign substances are mixed and defects of the PDP are generated, and disadvantages of using a strong adhesive for laminating are solved. Therefore, the deposition type front filter 70 enables to manufacture a light and thin PDP, reduce the defect rate of the PDP, and achieve a unified process.

As described above, according to the plasma display panel according to the present invention, it is possible to obtain a light and thin plasma display panel by depositing a front filter on the front surface of the panel. In addition, the manufacturing process can be simplified by unifying the duality of the process, which is a disadvantage of the front filter including glass employed in the conventional plasma display panel, and omitting the film type front filter laminating process, which is essential when employing the film type front filter. By doing so, foreign matter may be mixed during lamination, thereby reducing a problem that may cause a defect of the plasma display panel.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a perspective view showing a discharge cell structure of a conventional three-electrode AC surface discharge type plasma display panel.

2 is a diagram illustrating a frame for expressing 256 gray levels in a typical plasma display panel.

3 is a cross-sectional view schematically showing one side of a conventional plasma display.

4 is a cross-sectional view schematically showing the front filter shown in FIG.

5 is a view showing in detail the grounding process of the front filter and the filter support shown in FIG.

6 is a sectional view schematically showing a film type front filter.

7 illustrates a plasma display panel according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y, 12Z: transparent electrode

13Y, 13Z: bus electrode 14, 22: dielectric layer

16: protective film 18: lower substrate

24: partition 26: phosphor layer

30,60,70: Front filter 32,78: Panel

34: heat sink 36: printed circuit board

38 back cover 40 filter support

42: support member 50,62,76: antireflective film

52,64: optical film 54: glass

56,66,74: EMI shielding film 58,68,72: NIR shielding film

Claims (4)

Panel, And a front filter including at least one deposition film deposited directly on the front surface of the panel. The method of claim 1, The at least one deposition film, A plasma display panel comprising an antireflection film, an electromagnetic wave shielding film, and a near infrared ray shielding film. The method of claim 2, And the anti-reflection film is formed on the outermost layer of the front filter. The method of claim 2, And the near-infrared shielding film, the electromagnetic shielding film, and the anti-reflective film are sequentially deposited and stacked on the panel.