KR20070108718A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to thin and lighten the panel by using a directly attached filter having a thickness of up to 100 micrometers which is manufactured in a roll type. A front substrate(110) and a rear substrate(150) are placed opposite to each other, and have a plasma discharge structure therebetween. A directly attached filter(220) is attached to an outer surface of the front substrate, and is made of a single film having a thickness of up to 100 micrometers. The directly attached filter has transmissivity of 30 to 90%, and is made of a polyethylene Terephtalate film or a tri-acetyl-cellulose film.

Description

Plasma display panel {Plasma display panel}

1 is a cross-sectional perspective view of a plasma display panel according to a first embodiment of the present invention.

FIG. 2 schematically illustrates a front substrate and a direct filter of the plasma display panel shown in FIG. 1.

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

<Description of reference numerals for the main parts of the drawings>

100: plasma display panel 110: front substrate

120 scanning electrode 125 sustaining electrode

127: bus electrodes 130, 165: dielectric layer

135: protective film 150: back substrate

160: address electrode 170: partition wall

190: phosphor layer 195: discharge cell

220, 250: direct attachment filter 260: single layer film

270 coating layer

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a filter attached directly to the front substrate.

In accordance with recent trends aiming at increasing the size and flattening of screens, researches on various flat panel displays having a matrix structure are being actively conducted. For example, planar displays such as liquid crystal displays (LCDs), field emission displays (FEDs), and plasma display panels have been actively developed.

Among these, the plasma display panel is a device that displays characters or images by using a plasma. In particular, in a plasma display panel, a glow discharge is used, and 147 nm vacuum ultra violet generated through the glow discharge excites red, green, and blue phosphors. Characters or images are implemented by the visible light generated at this time. Such a plasma display panel is not only thin and large in size, but also simple in structure and easy to manufacture. In addition, the plasma display panel has an advantage of higher luminance and luminous efficiency than other flat panel displays.

A schematic structure of an AC surface discharge plasma display panel which is widely used is as follows. The plasma display panel is composed of a back substrate and a front substrate. In the rear substrate, an address electrode is disposed to cross 90 DEG with two electrodes of the front substrate. In addition, a sustain electrode and a scan electrode are formed on the front substrate in parallel with each other. In general, the sustain electrode and the scan electrode are formed of indium tin oxide (ITO) in consideration of the transmittance, and a bus electrode mainly made of silver (Ag) is formed at the edge of the electrode to compensate for the high resistance of the ITO. In addition, a dielectric layer is applied on the electrodes to limit current through natural capacitive formation. A magnesium oxide (MgO) protective film is deposited on the dielectric layer.

However, since the plasma display panel having the above structure implements an image by applying high voltage and high frequency, relatively many electromagnetic waves are generated on the front substrate of the plasma display panel. In addition, the plasma display panel emits near infrared rays (NIR) derived from inert gases such as neon (Ne) and xenon (Xe), which are very close to the wavelength of the remote controller used in home appliances. There is a problem that causes malfunction. Furthermore, there are various problems such as contrast reduction due to reflection of external light and glare of the user.

In order to solve this problem, a filter is usually installed on the front substrate of the plasma display panel. In the past, glass filters have been widely used.

The glass filter is installed at a spaced distance from the front substrate of the plasma display panel. The glass filter refers to a filter in which an antireflection (AR) film, an optical characteristic film, a near-infrared (NIR) shielding film, and an electromagnetic wave (EMI) shielding film are attached to a transparent glass substrate.

However, since the glass filter described above includes a transparent glass substrate, the glass filter has a thick thickness and a heavy weight. This causes a reduction in weight, thickness, and cost of the plasma display panel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel that can be reduced in weight, thickness, and cost by providing a thin direct-attach filter.

In order to achieve the above object, the plasma display panel of the present invention is sealed while being disposed opposite to each other, and a front substrate and a back substrate having a plasma discharge structure therebetween, and are attached in contact with an outer surface of the front substrate, and have a thickness. The direct attachment filter which consists of a single | mono layer film which is 100 micrometers or less is included.

Here, the transmittance of the direct attachment filter may be in the range of 30 to 90%. And the turbidity of the direct attachment filter may be in the range of 3 to 11%.

The direct attachment filter may be made of a polyethylene terephthalate film, or may be made of a triacetyl cellulose film.

In addition, an antireflection layer or an antiglare hard coating layer may be further attached to an outer surface of the single layer film, and a near infrared (NIR) shielding film, an electromagnetic shielding (EMI) shielding film, and an antireflection (AR) film may be sequentially coated. have.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Although the present invention is illustrated by the accompanying drawings, it is provided to fully alert those skilled in the art to the scope of the invention, and can be replaced with various forms, sizes, and the like. And in the case of known technologies that are generally well known, a detailed description thereof will be omitted.

1 is a cross-sectional perspective view of a plasma display panel 100 according to a first embodiment of the present invention.

Referring to the structure of the plasma display panel 100, the plasma display panel 100 includes a front substrate 110 and a rear substrate 150, and the front substrate 110 and the rear substrate 150 have various structures. It can be seen that the electrodes 120, 125, 127, 160 and the dielectric layers 130, 165 are formed.

More specifically, referring to the structure of the plasma display panel 100, the front electrode 110 has a display electrode including the sustain electrode 125 and the scan electrode 120 for sustain discharge in one direction (the x-axis direction of the drawing). It is formed side by side. In general, the sustain electrode 125 and the scan electrode 120 are formed of indium tin oxide (ITO) in consideration of the transmittance, and mainly to compensate for the high resistance of the ITO at the edges of the sustain electrode and the scan electrodes 120 and 125. A bus electrode 127 made of silver (Ag) is formed.

The first dielectric layer 130 is coated on the sustain electrode 125 and the scan electrode 120 to limit the current through natural capacitive formation. As such, since the first dielectric layer 130 is formed, a memory characteristic, which is one of the main characteristics of an AC plasma display panel, is displayed. A magnesium oxide (MgO) protective film 135 is deposited on the first dielectric layer 130. The magnesium oxide (MgO) protective layer 135 protects the first dielectric layer 130 from sputtering of ions, and has a characteristic of a relatively high secondary electron generation coefficient when low energy ions hit the surface during discharge. Lower the driving and holding voltages.

In the rear substrate 150, the address electrodes 160 are arranged side by side in a direction (y-axis direction in the drawing) that intersects the sustain electrodes and the scan electrodes 120 and 125 of the front substrate. The address electrode 160 plays a role of selecting a discharge cell 195.

The second dielectric layer 165 is coated on the address electrode 160. A partition wall 170 is provided on the second dielectric layer 165 to partition the discharge cells 195 and to secure a space between the front substrate 110 and the rear substrate 150.

In the present embodiment, the partition wall 170 is formed in a stripe type that extends only in the y-axis direction, but may be formed in a matrix type that crosses and extends in the y-axis direction and the x-axis direction.

The phosphor is coated inside the discharge cell 195. That is, red, green, and blue phosphor layers 190 are formed on the sidewalls of the barrier rib 170 and the second dielectric layer 165 for each discharge cell 195. At this time, three discharge cells 195 corresponding to red, green, and blue form one pixel.

Hereinafter, the light emission principle of the plasma display panel 100 having the above configuration will be described. First, when an address voltage and a scan voltage are applied to the address electrode 160 and the scan electrode 120, an address discharge is generated therebetween, and wall charges are formed in the discharge cell 195. Next, when a discharge sustain voltage is applied between the scan electrode 120 and the sustain electrode 125, the discharge sustain voltage is added to the wall voltage formed by the wall charge and exceeds the discharge start voltage. At this time, a sustain discharge occurs in the discharge cell 195.

That is, when a voltage is applied to the scan electrode 120 and the sustain electrode 125, the seed electrons are accelerated by the electric field, and the accelerated electrons ionize the neutral particles around by collision. In addition, ions and free electrons obtained through ionization are also accelerated by the electric field, which causes other neutral particles to ionize through collisions. Repeating this process causes breakdown of the gas, which is called avalanche discharge.

The plasma of the plasma display panel is a high pressure glow plasma close to the atmospheric pressure even in the gas discharge phenomenon. As described above, the plasma display panel 100 using the glow discharge may maintain the discharge at a voltage lower than the discharge start voltage.

When the discharge occurs as described above, 147 nm vacuum ultra violet generated in the discharge process collides with the phosphor layer 190 of red, green, and blue to generate visible light. Let's go. Eventually we see red, green, and blue phosphor layers 190 excited and see a combination of the visible light generated by them.

However, since the plasma display panel 100 implements an image by applying a high voltage and a high frequency as described above, relatively many electromagnetic waves are generated. In addition, the plasma display panel 100 emits near infrared rays (NIR) derived from an inert gas such as neon (Ne) and xenon (Xe) therein, which may cause a malfunction of the remote controller used in home appliances.

In order to solve such a problem, the direct attachment filters 220 and 250 are installed on the front substrate 110 of the plasma display panel 100. The structures of the direct attachment filters 220 and 250 will be described with reference to FIGS. 2 and 3.

FIG. 2 schematically illustrates the front substrate 110 and the direct filter 220 of the plasma display panel shown in FIG. 1. Referring to this, a single layer film is attached to the front substrate 110 of the plasma display panel as a direct attachment filter 220. This monolayer film may be a polyethylene terephthalate film or a tri-acetyl-cellulose film.

The thickness t ₁ of the single layer film is formed to 100 μm or less. In addition, the transmittance of the direct attachment filter 220 is in the range of 30 to 90%. In addition, the haze of the direct attachment filter 220 is in the range of 3 to 11%. The lower the turbidity, the clearer the image quality. In general, the greater the elongation of the film material, the lower the turbidity. Therefore, the production of the single-layer film is produced by biaxially stretching (stretching) the film. As a result, the turbidity of the direct attachment filter 220 may be in the range of 3 to 11%.

 3 is a cross-sectional view of a plasma display panel according to a second embodiment of the present invention. Referring to this, the single layer film 260 and the coating layer 270, that is, the direct attachment filter 250 are contacted and attached to the front substrate 110 of the plasma display panel.

The single layer film 260 may be a polyethylene terephthalate film or a tri-acetyl-cellulose film.

The multilayer coating layer 270 is coated on the single layer film 260. That is, the near-infrared (NIR) shielding film 272, the electromagnetic shielding (EMI) shielding film 274, and the anti-reflection (AR) film 278 may be sequentially coated on the outer surface of the single layer film 260. In addition, the optical layer 276 may be further coated on the coating layer. In addition, an antireflection layer (not shown), an antiglare hard coating layer (not shown), or a color correction film (not shown) may be further attached to the coating layer.

At this time, the thickness t ₂ of the above-described single layer film 260 and the multilayer coating layer 270, that is, the direct attachment filter 250 is formed to 100 μm or less. And the transmittance of the direct attachment filter 250 is in the range of 30 to 90%. In addition, the turbidity of the direct attachment filter 250 is in the range of 3 to 11%.

The near-infrared shielding film 272 prevents near-infrared rays above a predetermined reference from being emitted to the outside of the plasma display panel so that devices that transmit signals using infrared rays, such as a remote controller, can normally transmit signals.

The electromagnetic shielding film 274 shields electromagnetic waves, thereby preventing the electromagnetic waves from being emitted to the outside of the plasma display panel.

The anti-reflection (AR) film 278 has a function of preventing the light incident from the outside from being reflected back to the outside to improve the contrast of the plasma display panel.

In addition, when the optical characteristic film 276 is further coated, the optical characteristic film 276 improves the optical characteristics of the plasma display panel by adjusting luminance.

The direct attachment filter 250 having such a structure is light in weight, and its thickness t ₂ is 100 μm or less, so that it can be manufactured by a roll type.

As a result, mass production of the direct-attached filters 220 and 250 becomes possible.

On the other hand, the present invention is not limited to the above-described embodiments, it is apparent that modifications and improvements can be made by those skilled in the art without departing from the spirit of the present invention.

As mentioned above, according to this invention, since the direct attachment filter of thickness 100 micrometers or less is employ | adopted, thickness reduction is possible. In addition, since the direct-attachment filter having a thickness of 100 μm or less is lighter than a conventional filter, the overall weight of the plasma display panel employing the direct-attachment filter is reduced.

In addition, since the thickness of the direct attachment filter is thin, a roll type may be manufactured, and thus, the mass production of the direct attachment filter is possible. This leads to an improvement in the productivity of the plasma display panel.

Claims (7)

A front substrate and a rear substrate sealed while being disposed opposite to each other and having a plasma discharge structure therebetween; And Directly attached filter made of a single layer film having a thickness of 100 μm or less and attached to the outer surface of the front substrate. Plasma display panel comprising a. The method of claim 1, And a transmittance of the direct attachment filter is in a range of 30 to 90%. The method of claim 1, The turbidity of the direct attachment filter is formed to be in the range of 3 to 11%. The method of claim 1, The direct attachment filter is a plasma display panel comprising a polyethylene terephthalate film. The method of claim 1, The direct-attachment filter is a plasma display panel consisting of a tri-acetyl-cellulose film. The method of claim 1, And an antireflective layer or an antiglare hard coat layer is further attached to an outer surface of the single layer film. The method of claim 1, And a near-infrared shielding film, an electromagnetic wave shielding film, and an anti-reflective film are sequentially coated on the outer surface of the single layer film.

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