KR100788939B1 - Plasma display pannel - Google Patents

Abstract

The present invention relates to a plasma display panel including a multi-film film filter and a photonic crystal in the dielectric layer of the top plate in order to improve the contrast ratio in the implementation of the plasma display,

A plasma display panel comprising an upper plate having an upper dielectric layer, and a lower plate having lower dielectric layers and barrier ribs and phosphors formed on the dielectric layer, the plasma display panel comprising a multi-film film filter inside or outside the dielectric layer. panel,

Or a plasma display panel including an upper plate having an upper dielectric layer, a lower plate having a lower dielectric layer and a barrier rib formed on an upper side of the dielectric layer, and a phosphor, wherein a color filter is formed on the upper dielectric layer. The plasma display panel is applied.

PDP, plasma display panel, brightness, contrast ratio

Description

Plasma display panel {Plasma display pannel}             

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

2 is a cross-sectional view of Embodiment 1 of the present invention.

3 is a detailed cross-sectional view of the unit cell of FIG.

4 is a cross-sectional view of Embodiment 2 of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12A: scan electrode

12B: sustain electrode 14, upper dielectric layer

15: top 16: shield

18: lower substrate 20: data electrode

22: lower dielectric layer 24: partition wall

25: lower plate 26: phosphor

30: PDP 40: Top plate

41: upper substrate 42: upper dielectric layer

43: multilayer thin film filter 44: lower dielectric layer

45: protective film 50: lower substrate

51: lower substrate 52: lower dielectric layer

53: partition 54: phosphor

60: top plate 61: top board

62: upper dielectric layer 63: multiple thin film filter

64: lower dielectric layer 65: protective film

66: photonic crystal 70: lower substrate

71: lower substrate 72: lower dielectric layer

73: partition 74: phosphor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter referred to as a PDP), and more particularly, to include a multiple thin film filter and a photonic crystal in a dielectric layer of a top plate in order to improve the contrast ratio in implementing a plasma display. It is about PDP.

With the recent full-fledged rise of digital broadcasting, the demand for large-screen flat panel displays is increasing and the demand for new displays suitable for the digital broadcasting era is increasing.

In line with this trend, various flat panel displays such as liquid crystal displays (LCD TVs), plasma displays, and projection TVs occupy respective areas in the market.

Although each display has advantages and disadvantages, PDP, which is easy to manufacture a large panel, is drawing attention as a flat panel display device.

The PDP normally displays an image by adjusting the gas discharge period of each pixel in accordance with digital video data.

As such a PDP, an AC type PDP having three electrodes and driven by an AC voltage is typical.

1 is a perspective view showing a structure of an AC (AC) type PDP 30, in particular, showing 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 layer 16 sequentially formed on the upper substrate 10, and the lower substrate 18. A lower plate 25 having a data electrode 20, a lower dielectric layer 22, a partition wall 24, and a phosphor 26 sequentially formed thereon is provided.

The upper substrate 10 and the lower substrate 18 are spaced in parallel by the partition wall 24.

Each of the sustain electrode pairs 12A and 12B has a relatively wide width and a transparent electrode for transmitting visible light, and a relatively narrow width and a metal electrode for compensating for the resistive 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 the 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 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 sustains the discharge by the surface discharge between the sustain electrode pairs 12A and 12B.

As a result, in the discharge cell, the fluorescent material 26 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted outside the cell. 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.

In the case of plasma displays, price competition is intensifying in recent years, and demands for low power consumption, high efficiency, and high brightness are increasing.

Recent technological advances have continued to improve the brightness and contrast ratios in the darkroom, and many results have been published one after another.

However, unlike the technical development, the improvement of the contrast ratio has almost progressed, and various studies are being conducted by plasma display manufacturers to find a solution.

RCA proposed a method to improve the contrast ratio by adding a color filter to the front glass, and other companies are trying to improve the contrast ratio by coating and combining various materials on the front filter.

In addition, in order to reduce the reflectance of the phosphor, a method of coloring, etc. has been examined, but a practical effect is not obtained due to a decrease in efficiency.

An object of the present invention devised to solve the above problems is to set the R, G, B color to selectively transmit through the thin film coating on the plasma display front panel to minimize the internal reflection of the phosphor against the incident of external light In addition, the internally generated visible light transmits only a selective wavelength without absorbing light, thereby providing a method of increasing color purity and luminance.

Still another object of the present invention is to provide a method of forming a photonic crystal on the surface of a conventional color filter or a multilayer thin film filter applied to the present invention in order to maximize the overall light utilization efficiency.

According to an aspect of the present invention, there is provided a plasma display panel including an upper plate having an upper dielectric layer and a lower plate having lower dielectric layers and partitions and phosphors formed on the dielectric layer, wherein the thin film is formed inside or outside the dielectric layer. A plasma display panel comprising a film filter.

It is characterized in that the photonic crystal is applied to the outside of the multiple thin film filter.

Another invention for achieving the above object is a plasma display panel including an upper plate having an upper dielectric layer, a lower plate having a lower dielectric layer and a partition formed on the dielectric layer and a phosphor, and a color filter formed on the upper dielectric layer. The plasma display panel is characterized in that a photonic crystal is applied to the outside of the color filter.

Hereinafter, the present invention will be described in detail through examples and drawings.

A first feature of the present invention is to selectively transmit R, G, and B colors by using a thin film multiple coating having a specific refractive index on the front plate and adjusting the thickness of the thin film.

The second feature is that the thin film is implemented through pre-processing under the front glass plate or between the dielectric films.

The third feature is that the photonic crystal can be formed on the surface of a conventional color filter to improve the light efficiency.

The fourth feature is that unlike the conventional color filters, there is no light loss due to light absorption, thereby enabling high luminance.

The fifth feature is that the principles of the present invention can be used to improve the efficiency of all flat panel displays.

In general, when two dielectric materials having different refractive indices are repeatedly stacked, light of a specific wavelength region can be selectively reflected or transmitted. Also, the thickness of R, G and B can be selectively reflected or transmitted by varying the thickness of the stack. What can be done is well known.

In the present invention, the optical properties are applied to the plasma display front panel to maximize the brightness as well as the contrast ratio.

2 is a view illustrating a first embodiment of the present invention, wherein a multilayer thin film filter is arranged in which the R, G, and B colors are selectively transmitted by aligning unit cells between the dielectric layers 42 and 44 on the upper plate 40 side. It is sectional drawing formed by laminating (43).

2, all the illustration of the electrode in the prior art is abbreviate | omitted.

The first embodiment according to the present invention includes an upper plate 10 having a sustain electrode pair (not shown), upper dielectric layers 42 and 44, and a protective film 44 sequentially formed on the upper substrate 41, and a lower substrate ( 51 has a structure of an alternating current (AC) type PDP including a lower plate 50 having a data electrode (not shown), a lower dielectric layer 52, a partition 53, and a phosphor 54 sequentially formed on the substrate 51.

The upper substrate 41 and the lower substrate 51 are spaced apart in parallel by the partition wall 54.

Here, the multilayer thin film filter 43 may be formed not only between the dielectric layers 42 and 44 but also between the dielectric layer 41 and the windshield, which is the upper substrate 41 provided thereon.

That is, when laminated on the upper substrate 41, the dielectric layer 42, the multilayer thin film filter 43, the dielectric layer 44, the protective film 45 is laminated in the order, or the multilayer thin film filter, the dielectric layer, the protective film in the order of. It is stacked.

The protective layer 45 is included in the upper dielectric layer 14 and the lower dielectric layer 22 to accumulate charges generated during gas discharge, thereby preventing damage to the upper dielectric layer due to sputtering of plasma and increasing emission efficiency of secondary electrons. Magnesium oxide (MgO) is usually used.

3 illustrates one unit cell of Embodiment 1, which is expressed with respect to a light path.

In the multilayer thin film filter 43, first, only a color corresponding to a unit cell (any one of R, G, and B) is incident inside the unit cell with respect to external incident light, and the incident light is emitted from the phosphor 54. Reflected from the surface of) and emitted to the outside with visible light generated from the inside.

On the other hand, visible light generated through excitation of the phosphor 54 by ultraviolet rays is filtered out of the remaining region except for the wavelength band transmitted through the multilayer thin film filter 43, so that only the light emitting color having high color purity is emitted to the outside.

In this case, unlike the conventional color filter, the multilayer thin film filter 43 has an advantage of relatively low luminance decrease because the absorption loss of light is small.

In addition, since the reflection on the surface of the phosphor of external light is minimized, the brightness and contrast ratio can be dramatically improved.

FIG. 4 is a structural diagram of a front plate maximizing light efficiency by forming a photonic crystal 66 on the surface of the multilayer thin film filter 63 of Example 1 as shown in Example 2 of the present invention.

Although the device structure is the same as that of the first embodiment, the photonic crystals formed on the surface of the multilayer thin film filter 63 are distinguished.

The photonic crystal 66 is obtained by using a separate thin film on the multilayer thin film filter 63 described above, and printing and curing the dielectric layer 62 thereon.

Through the photonic crystal 66, scattering loss may be prevented at the total internal reflection or at the interface, and light may be emitted to the outside to maximize the light efficiency.

Therefore, the photonic crystal 66 is preferably densely coated so that the multilayer thin film filter 63 is completely covered when the multilayer thin film filter 63 is viewed in a plan view.

In addition, according to the third embodiment of the present invention, in the case of the conventional color filter (not shown), since the light loss is large due to light absorption or low transmittance, the light efficiency can be improved by forming the photonic crystal on the surface of the color filter. have.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, the present invention can obtain excellent efficiency in providing a method capable of dramatically improving the contrast ratio in a plasma display.

In addition, the absorption of light is less than that of a conventional color filter, so that there is almost no decrease in luminance, and photonic crystals are formed on the entire surface of a conventional color filter to maximize light utilization efficiency. .

Apart from this, it does not have a specific color, but it minimizes the surface reflection of phosphor of visible light incident from the outside through a thin film that can selectively transmit R, G, and B colors, and conversely, internal visible light generated through wavelength conversion allows selective transmission. By doing so, excellent contrast ratio and brightness can be realized.

That is, it is possible to implement the same performance as the color filter without lowering the light transmittance.

Claims (5)

A plasma display panel comprising an upper plate having an upper dielectric layer, and a lower plate having lower dielectric layers and partitions and phosphors formed above the lower dielectric layer. And a filter layer made of a plurality of films having different refractive indices of two or more layers inside or outside the dielectric layer. The method of claim 1, And a film having a photonic crystal structure is further applied to the outside of the filter layer. The method of claim 1, And the filter layer selectively transmits light of a specific wavelength band. A plasma display panel comprising an upper plate having an upper dielectric layer, a lower plate having lower dielectric layers and partitions and phosphors formed on the dielectric layer, and having a color filter formed on the upper dielectric layer. And a layer having a photonic crystal structure is applied to the outside of the color filter. The method of claim 4, wherein And the layer having the photonic crystal structure selectively reflects light of a specific wavelength band.

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