KR100696820B1 - Plasma display device - Google Patents

Abstract

A plasma display device is provided to reduce weight and thickness and simplify a manufacturing process by forming a front filter with a film type layer. A plasma display device includes a panel and a front filter(82). The panel is formed with an upper substrate(85') and a lower substrate(85"). The front filter is formed by laminating a functional layer on a front surface of the panel. The width of the front filter is less than an overlapped area between the lower substrate and the upper substrate. The front filter is formed with a dual structure of a lower film having an electromagnetic wave shielding layer and an upper film having an anti-reflective layer.

Description

Plasma display device

1 is a perspective view showing the structure of a conventional three-electrode AC surface discharge plasma display panel;

2 shows a method of laminating a front filter on an upper substrate of a panel;

3A is a schematic diagram illustrating a method of attaching a front filter to a front surface of a conventional plasma display panel using a laminating apparatus;

Figure 3b is a partial cross-sectional view showing the pressure applied by the roller when the front filter is attached to the front surface of the conventional plasma display panel,

4A is a schematic diagram illustrating a method of attaching a film type front filter to a front surface of a plasma display panel using a laminating apparatus according to one embodiment of the present invention;

4B is a partial cross-sectional view showing the pressure exerted by the roller when the film type front filter is attached to the front side of the display panel according to an embodiment of the present invention.

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<Description of Symbols for Main Parts of Drawings>

30, 70, 80: PDP 15, 75 '85': Upper board

25, 75 ", 85": lower substrate 72, 82: front filter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device including a front filter that can be attached to a front surface of a plasma display panel that forms part of a plasma display device without damage to the panel.

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. These PDPs are not only easy to thin and large, but also provide significantly improved image quality thanks to recent technological developments, especially the three-electrode alternating surface discharge type PDP has a wall charge on the surface during discharge. It accumulates and protects the electrodes from sputtering generated by discharge, which has advantages of low voltage driving and long life.

FIG. 1 is a perspective view of a structure of an AC (AC) type PDP, and in particular, illustrates a structure of a discharge cell corresponding to one sub-pixel.

The discharge cell shown in FIG. 1 includes an upper plate 15 having sustain electrode pairs 12A and 12B, an upper dielectric layer 14 and a protective film 16 sequentially formed on the upper substrate 10, and a lower substrate 18. A lower plate 25 having a data electrode 20, a lower dielectric 22, a partition 24, and a phosphor layer 26 sequentially formed thereon is provided.

The upper substrate 10 and the lower substrate 18 are spaced apart in parallel by the partition wall 24. Each of the sustain electrode pairs 12A and 12B has a relatively wide width and is composed of a transparent electrode for transmitting visible light, and a relatively narrow width and metal electrode for compensating for the resistance component of the transparent electrode. The sustain electrode pairs 12A and 12B are constituted by the scan electrode 12A and the sustain electrode 12B. The scan electrode 12A mainly supplies a scan signal for determining the data supply time and a sustain signal for sustaining discharge, and the sustain electrode 12B mainly supplies a sustain signal for sustaining the discharge. Charges generated during gas discharge are accumulated in the upper dielectric layer 14 and the lower dielectric layer 22. The protective layer 16 prevents damage to the upper dielectric layer 14 due to the sputtering of the plasma, thereby increasing the lifetime of the PDP and increasing the emission efficiency of the secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used. The dielectric layers 14 and 22 and the protective layer 16 may lower the discharge voltage applied from the outside. The data electrode 20 is formed to cross the storage electrode pairs 12A and 12B. This data electrode 20 supplies a data signal for selecting cells to be displayed. The partition wall 24 forms a discharge space together with the upper and lower substrates 10 and 18, and is formed in parallel with the data electrode 20 to prevent the ultraviolet rays generated by the gas discharge from leaking into adjacent cells. The phosphor layer 26 is applied to the surfaces of the lower dielectric layer 22 and the partition wall 24 to generate visible light of any one of red, green, and blue. The discharge space is filled with an inert gas such as He, Ne, Ar, Xe, Kr for gas discharge, a discharge gas having a combination thereof, or an excimer gas capable of generating ultraviolet rays by discharge.

The discharge cell of this structure is selected by the counter discharge between the data electrode 20 and the scan electrode 12A, and then holds the discharge by the surface discharge between the sustain electrode pairs 12A and 12B. Accordingly, the fluorescent material 26 emits light in the discharge cells by ultraviolet rays generated during sustain discharge, so that visible light is emitted to the outside of the cells. In this case, the discharge cell implements a gray scale by adjusting the discharge sustain period of the cell, that is, the number of sustain discharges according to the video data.

The front filter 40 is divided into a glass type front filter and a film type front filter. The glass type front filter is usually mounted away from the front of the display device by a separate supporting member, but the film type front filter is attached to the front of the display device. However, when using the laminating method used as the film attachment method in attaching the film type front filter to the display device, the existing film filter may be damaged when the panel is attached to the front of the display device.

Hereinafter, the film-type front filter will be described in detail.

The PDP has a front filter attached to the front of the PDP for electromagnetic shielding, external light reflection prevention, near-infrared shielding, and optical correction such as color correction.

The dual film type front filter includes a color correction film, a near infrared shielding film, an electromagnetic wave shielding film, and an anti-reflection film sequentially attached to the top plate of the PDP.

The antireflection film improves contrast by preventing light incident from the outside from being emitted back to the outside. The near-infrared shielding film absorbs near-infrared rays in the 800 ~ 1000NM wavelength band generated from the PDP to shield the radiation from the outside, so that the control infrared rays generated by the remote control (about 947 nm) are normally applied to the infrared receiver provided in the PDP set without disturbing the near-infrared rays. Allow input. The color correction layer includes a color adjusting dye (Color Dye) to increase the color purity by adjusting the color tone. These antireflection films, near-infrared shielding films, and color correction films are attached to each other through an adhesive or an adhesive. Such a film type front filter is adhesively attached to the surface to be attached to the PDP, and is supplied with release paper attached to the adhesively treated surface. Accordingly, the release paper is peeled off from the film front filter and then attached to the front surface of the PDP.

On the other hand, in the case of attaching the film-type thin film and the thin film, or attaching the film-type thin film to the thin plate material is to use a laminating (Laminating) device as shown in FIG.

The laminating apparatus passes the PDP 70 and the film 72 supplied from the film roller 76 'between two rotating rollers 74 and 76 to pass the film 72 to the front of the PDP 70. Will be attached.

However, when attaching the direct-attach film 72 having the same size as the upper substrate as shown in Figure 3a, as shown in Figure 1 PDP having a structure in which the upper plate 15 and the lower plate 25 is bonded The difference between the widths of the upper and lower substrates 15 and 25 inevitably arises at the 30, so that the front filter 72 is fronted by using the laminating apparatus as shown in FIGS. 3A and 3B. In the case of attachment to the panel, the panel may be damaged at both ends of the upper plate due to the pressure of the attachment roller 74 due to the difference between the width of the upper substrate 75 'and the lower substrate 75 "(FIG. 3B).

The present invention is to solve the problem that the panel is damaged when attaching the conventional film-type front filter described above, an object of the present invention is to provide a plasma display device having a film-type front filter that is easy to attach without damaging the panel. It is.

The present invention to achieve the above object,

In the plasma display device comprising a panel comprising an upper substrate and a lower substrate and a filter formed by stacking a functional film on the front of the panel.

And a plasma display device having a width equal to or less than a range where the lower substrate and the upper substrate overlap with each other.

The front filter may have a dual structure of a lower layer film on which the electromagnetic shielding film is formed and an upper layer film on which an antireflection film is formed.

The upper layer film and the lower layer film may be made of polyethylene terephthalate (PET), triacetate cellulose (TAC), polycarbonate (PC), and PET.

It is preferable that the said film is a film whose transmittance | permeability is 30 to 90% and haze 1 to 20%.

It is preferable that the anti-reflective hard coating of the upper layer film has a thickness of 2 to 7 µm and a pencil hardness of 2 to 3H.

The front filter may include an antireflective film which prevents light incident from the outside incident to the outside from being reflected back to the outside, and an optical characteristic film that lowers the luminance of red and green and increases the luminance of blue among the light incident from the panel; The apparatus may further include a near-infrared shielding layer that prevents the near-infrared (NIR) above the reference from being emitted to the outside so as to shield the near-infrared (NIR) emitted from the panel so as to normally transmit a signal.

The front filter is attached to the front of the display panel by a pressure-sensitive adhesive or an adhesive, the pressure-sensitive adhesive may perform a color correction or neon light blocking function by adding a pigment / dye as needed.

The front filter may be attached to the upper substrate by a roller pressing method.

The present invention will be described in more detail according to an embodiment with reference to the accompanying drawings.

4A is a schematic diagram illustrating a method of attaching the film front filter 82 according to the embodiment of the present invention to the front surface of the upper substrate 85 ', and FIG. 4B is a film front view according to the embodiment of the present invention. It is sectional drawing which shows that the filter 82 was affixed on the front surface of the upper substrate 85 '.

As shown in FIGS. 4A and 4B, the plasma display apparatus (not shown) according to the present invention can be easily filmed on the front surface of the upper substrate 85 'without damaging the panel 80 even using a conventional laminating apparatus. Type front filter 82 may be attached.

That is, between the two rotating rollers 84 (not shown), the PDP 80 in which the upper substrate 85 'and the lower substrate 85 "are bonded, and the film type front filter supplied from the film roller (not shown). By passing through 82, the film front filter 82 is attached to the front surface of the PDP 80.

At this time, unlike the prior art, according to the present invention, since the film type front filter 82 is manufactured to a size less than the width of the overlapping range of the upper substrate 85 'and the lower substrate 85 "to the attachment roller 74 Pressure is applied only to the inner surface supported by the lower substrate 85 ', so that the panel may be damaged due to the pressure applied to the region where only the upper substrate 85' is present without the lower substrate 85 'being supported. Without this, the film type front filter can be easily attached to the upper substrate 85 '. According to the present invention, when cutting the width of the film filter 82 without having to manufacture a separate front filter attachment device, the size is adjusted to the width of the corresponding lower substrate 85 overlapping with the upper substrate 85 '. This can simply solve the conventional problem.

Hereinafter, a plasma display device with a film type front filter according to the present invention will be described in more detail.

According to an embodiment of the present invention, a plasma display device includes a case, a PDP having a printed circuited board (hereinafter referred to as a PCB) and a film front filter, and a front outer portion of the PDP having a film front filter. It is provided with a cover that is fastened to the case while wrapping.

The case protects the PDP housed together with the PCB from external impact and blocks electromagnetic waves emitted to the side and the back of the PDP. In addition, the case is electrically connected to the film type front filter formed on the front surface of the PDP. Specifically, the case is electrically connected to the electromagnetic shielding film constituting the film type front filter. Accordingly, the case is grounded to the ground power supply together with the electromagnetic shielding film of the film type front filter to absorb and discharge the electromagnetic waves emitted from the PDP to block the electromagnetic waves from being emitted to the outside.

The film-type front filter has functions such as electromagnetic wave blocking, external light reflection prevention, near infrared ray blocking, and color correction generated from the front side of the PDP. To this end, the film type front filter includes an electromagnetic shielding film and an antireflection film sequentially attached to the upper substrate of the PDP. The present invention may also additionally include near infrared barriers and the like.

The near-infrared shielding film absorbs near-infrared light in the wavelength range of about 700 to 1200 nm generated from the PDP to block radiation from the outside. Accordingly, the near-infrared blocking film allows the control infrared (about 947 nm) generated by the remote control or the like to be normally input to the infrared receiver provided in the PDP set without disturbing the near-infrared. In addition, the near-infrared blocking film includes a color adjusting dye (Color Dye) to increase the color purity together with the near-infrared absorber to increase the color purity.

The electromagnetic shielding film absorbs electromagnetic waves generated from the PDP and blocks the electromagnetic waves from being emitted to the outside. To this end, the electromagnetic shielding film is grounded to a ground power supply through a conductive case.

The anti-reflection film improves contrast by preventing light incident from the outside from being reflected back to the outside.

Many such thin films are formed on the base film and attached to the upper substrate of the PDP through an adhesive or an adhesive. In this case, according to the present invention, when the front filter is attached to the front surface of the upper substrate of the PDP by using a laminating device, the width of one side of the front film to be attached is limited within the range where the upper substrate and the lower substrate overlap, Since the pressure exerted for attachment is exerted only above the upper substrate supported by the lower substrate, the film can be easily attached to the front side of the panel without damaging the panel due to the pressure of the laminating apparatus exerted for the film attachment.

The base film is a thermoplastic resin such as polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), triacetate cellulose (TAC), polyethersulfone (PES), and the like For example, the thickness is preferably in the range of 25 to 150 µm, and the light transmittance is 80% or more, more preferably 90% or more.

The above embodiment is an example of a plasma display device and a method of manufacturing the same according to the present invention, and a person skilled in the art may use a front filter according to the present invention, and various modifications are possible.

The plasma display device according to the present invention can bring slimness, and the front filter used is formed of a film in a film form, so that a manufacturing process for forming a filter is advantageous. That is, compared with the existing glass filter, it is possible to reduce the weight, thickness and cost. In addition, the pressure-sensitive adhesive may be added with dyes / pigments as necessary to add functions such as color correction and neon light blocking. In particular, while using a conventional laminating device using a front filter that can be easily attached to the front of the display panel without damaging the panel, there is also a cost saving effect.

Claims (7)

delete In the plasma display device comprising a panel comprising an upper substrate and a lower substrate and a front filter formed by stacking a functional film on the front of the panel. The width of the front filter is less than or equal to the overlapping range of the lower substrate and the upper substrate, And wherein the front filter has a double structure of a lower layer film having the electromagnetic shielding film and an upper layer film having an antireflection film. The method of claim 2, And the upper layer film and the lower layer film are at least one of polyethylene terephthalate, triacet cellulose or polycarbonate. delete delete The method of claim 2, And the front filter further comprises an optical characteristic film or a near infrared shielding film. The method of claim 2, And the front filter is attached to the upper substrate by a roller pressing method.

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