KR20080057986A - Plasma display device - Google Patents

Abstract

A plasma display panel is provided to easily replace filters when a plasma display panel product is broken by forming a ground unit of the filter comprised of plural metal layers on only one surface of a panel. A filter is formed on a plasma display panel. A ground unit(300) is formed on the filter. The ground unit is opposite to a non-effective region of the plasma display panel. The ground unit is comprised of plural layers whose thermal expansive coefficients are different from each other. The ground unit includes at least one of copper(Cu), nickel(Ni), ferrum(Fe), manganese(Mn), and molybdenum(Mo). The ground unit is comprised of two layers(310,320). One of the two layers more adjacent to the plasma display panel has a higher thermal expansive coefficient.

Description

Plasma Display Device

1 is a view showing an embodiment of a plasma display device of the present invention;

2 is a cross-sectional view showing an embodiment of the filter structure of the present invention;

Figure 3 is a front view showing an embodiment of the filter structure of the present invention,

Figure 4 is a cross-sectional view showing an embodiment of the grounding portion of the filter structure of the present invention,

FIG. 5 illustrates an embodiment of electrode arrangement of a plasma display panel;

FIG. 6 is a timing diagram illustrating an embodiment of a time division driving method by dividing one frame into a plurality of subfields. FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a ground structure of a filter installed in front of a panel used in the device.

In general, a plasma display panel is a partition wall formed between an upper substrate and a lower substrate to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because a thin and light configuration is possible.

In this way, a film filter or a glass filter is provided on the front surface of the plasma display panel. These filters are very useful devices that include various functional layers such as shielding electromagnetic waves and near infrared rays emitted from the inside of the panel to the outside, reducing reflection of external light and correcting colors for a pleasant image.

However, since the filter is not easy to be removed once once installed on the front of the panel, when the defect occurs during the manufacturing process or when the filter needs to be removed due to filter replacement or filter breakage, the filter is removed. While there was a risk of damaging the panel, there was a problem that the rework time is longer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the ground portion of the filter installed in the plasma display panel is formed of two or more layers having different thermal expansion coefficients, thereby simplifying the manufacturing process of the PDP, and quickly replacing the filter. It is an object of the present invention to provide a plasma display device that can be safely and reliable.

Plasma display device of the present invention for solving the above technical problem is a plasma display panel; And a filter formed in the plasma display panel, wherein the filter is provided with a ground portion facing the ineffective area of the plasma display panel, and the ground portion is formed of a plurality of layers having different thermal expansion coefficients.

The ground portion may include at least one of copper (Cu), nickel (Ni), iron (Fe), manganese (Mn), and molybdenum (Mo), and the ground portion may be formed of two layers.

In addition, among the layers constituting the ground portion, it may be preferable that the coefficient of thermal expansion increases as the plasma display panel is adjacent to the plasma display panel.

Hereinafter, a plasma display device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an embodiment of a plasma display device according to the present invention.

As shown in FIG. 1, the plasma display panel includes a scan electrode 11, a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (Indi μm-Tin-Oxide; ITO), and the bus electrodes 11b. , 12b) may be formed of a metal such as silver (Ag) or chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). have. The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 11c to absorb external light generated outside the upper substrate 10 to reduce reflection. A black matrix (BM, 15) is arranged that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10, the first black matrix 15 and the transparent electrodes 11a and 12a formed at positions overlapping the partition wall 21. And the second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, which are also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, and may not be physically connected because they are not formed at the same time. have.

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, a lower dielectric layer 24 and a partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes the discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells. have.

Referring to FIG. 1, a filter 100 is formed on a front surface of a plasma display panel according to the present invention, and the filter 100 has an anti-reflection (AR) sheet, a near infrared shielding sheet (NIR), and an electromagnetic interference (EMI). Shielding sheet, diffusion sheet, optical sheet, External light shielding sheet may be included. Details of the filter 100 will be described in detail with reference to the diagram shown in FIG. 2 below.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

Meanwhile, in one embodiment of the present invention, although the R, G and B discharge cells are shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

2 is a cross-sectional view showing an embodiment of the structure of a filter according to the present invention.

Referring to FIG. 2, the filter 100 formed on the front surface of the plasma display panel includes an AR / NIR sheet, an EMI shield sheet, and an optical characteristic sheet.

Referring to FIG. 2, the AR / NIR sheet 110 has a function of reducing glare by preventing reflection of light incident from the outside on the front surface of the base sheet 113 made of a transparent plastic material. A reflection layer 111 is attached, and a NIR (Near Infrared) shielding layer 112 for shielding near infrared rays emitted from the panel so that signals transmitted using infrared rays such as a remote controller can be normally transmitted. .

The base sheet 113 is applicable to various materials in consideration of transparency, insulation, heat resistance, mechanical strength, etc., which can withstand the use conditions or manufacturing. For example, polyester-based resins, polyamide-based resins, polyolefin-based resins, vinyl-based resins, acrylic resins, cellulose-based resins, and the like may be used, and generally have good transparency and a polyethylene having a visible light transmittance of 80% or more. It is preferable to be formed of a polyester-based material such as telephthalate (PET), polyethylene naphthalate, etc., and the thickness of the base sheet 113 prevents the sheet from being damaged due to insufficient mechanical strength, and has a thickness larger than necessary. It may be desirable to form 50 μm to 500 μm in consideration of not spending the cost.

The EMI shielding sheet 120 has an EMI shielding layer 121 attached to a front surface of the base sheet 122 made of a transparent plastic material to shield electromagnetic interference (EMI) from being emitted from the panel to the outside. . In this case, the EMI shielding layer 121 is typically formed of a mesh structure using a conductive material, and the ratio of the EMI shielding sheet 120 in which an image is not displayed in order to make the grounding smooth is made. In the effective area, the conductive material is applied as a whole. The pattern width of the EMI shielding layer 121 is preferably formed to 10㎛ to 30㎛, in this case may have a sufficient electrical resistance value for electromagnetic shielding, the aperture ratio for the appropriate light transmittance can be secured.

In addition, since the adhesive 130 is layered between the AR / NIR sheet 110 and the EMI shielding sheet 120, the sheets 110 and 120 and the filter 100 are firmly attached to the front of the panel. To be possible. In addition, it is preferable that the material of the base sheet included between the sheets 110 and 120 is made of substantially the same material in consideration of the ease of fabrication of the filter 100.

Meanwhile, the filter 100 formed on the front surface of the panel may further include an optical characteristic sheet in addition to the AR / NIR sheet 110 and the EMI shielding sheet 120 as shown in FIG. 2. The optical sheet improves the color temperature and luminance characteristics of the light emitted from the panel. The optical sheet is formed by laminating an optical layer composed of a predetermined dye and an adhesive on the front or rear surface of the base sheet made of a transparent plastic material.

In addition, at least one basesheet of the above basesheets may be omitted, and any one of the basesheets may be made of rigid glass, which is not made of plastic, to improve a function of protecting the panel. Such glass is preferably formed spaced apart from the panel at a predetermined interval.

3 is a front view showing an embodiment of the filter structure of the present invention.

Referring to FIG. 3, when the filter 200 of the present invention is shown to the front, it is seen as a shape of an EMI shield sheet having a distinctive shape. That is, since the sheet other than the EMI shielding sheet has high transparency, the filter 200 may be divided into a mesh portion 210 and a ground portion 220 of the EMI shielding sheet.

As described above, the filter 200 of the plasma display apparatus according to the exemplary embodiment of the present invention electrically connects the mesh unit 210 formed on one side of the panel to shield electromagnetic waves generated from the panel, and the circumference of the mesh unit 210. It includes a grounding portion 220 formed to be. In this case, the grounding unit 220 may be formed at the position of the filter 200 facing the ineffective area where the image is not displayed on the panel.

On the other hand, the grounding unit 220 is most preferably formed on all the peripheral surfaces of the mesh unit 210, as shown in Figure 3 in order to make the filter 200 electrically connected smoothly, the grounding unit ( 220 may be formed only on one side around the mesh portion 210, it may be formed only on both sides around the mesh portion 210.

Figure 4 is a cross-sectional view showing an embodiment of the ground portion of the filter structure of the present invention, the ground portion 300 of the filter according to the present invention is composed of a plurality of layers having different thermal expansion coefficients.

The ground part 300 is formed for the electrical connection of the filter, and preferably made of a metal-based material having excellent conductivity. For example, the metal material constituting the ground part 300 may include at least one of copper (Cu), nickel (Ni), iron (Fe), manganese (Mn), and molybdenum (Mo). Metal compounds mixed with these materials include nickel (Ni) + iron (Fe), nickel (Ni) + manganese (Mn) + iron (Fe), nickel (Ni) + molybdenum (Mo) + iron (Fe), nickel ( Ni) + manganese (Mn) + copper (Cu), and the lowest coefficient of thermal expansion is an alloy of nickel (Ni) + iron (Fe), which is the most of the layers constituting the ground portion 300 in the panel It may be used to form adjacent layers.

Referring to FIG. 4, the ground portion 310 of the plasma display apparatus of the present invention may be formed of two layers, and the first layer 310 is a layer closest to the plasma display panel, and the first layer 310 may be formed. The thermal expansion coefficient is preferably higher than the thermal expansion coefficient of the second layer 320. In such a case, when a predetermined temperature is applied when removing the filter from the panel, the ground portion is bent toward the second layer 320 having a lower coefficient of thermal expansion than the first layer 310, which is the ground portion of the present invention. Since the filter 300 includes a gap in the panel, the filter can be easily removed from the panel.

Meanwhile, in the present invention, as illustrated in FIG. 4, only two layers of the ground part 300 are illustrated and described, but the present invention is not limited thereto. For example, the ground unit 300 may be formed of three, four, or more layers, and the coefficient of thermal expansion of each layer may be higher as it is adjacent to the panel.

FIG. 5 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel are preferably arranged in a matrix form as shown in FIG. 5. The plurality of discharge cells are provided at the intersections of the scan electrode lines Y1 to Ym, the sustain electrode lines Z1 to Zm, and the address electrode lines X1 to Xn, respectively. The scan electrode lines Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrode lines Z1 to Zm may be driven simultaneously. The address electrode lines X1 to Xn may be driven by being divided into odd-numbered lines and even-numbered lines, or sequentially driven.

Since the electrode arrangement shown in FIG. 5 is only an embodiment of the electrode arrangement of the plasma panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 5. For example, a dual scan method in which two scan electrode lines among the scan electrode lines Y1 to Ym are simultaneously scanned may be possible. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down in the center portion of the panel.

FIG. 6 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. The unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8 and a sustain section S1, ..., S8.

Here, according to an embodiment of the present invention, the reset period may be omitted in at least one of the plurality of subfields. For example, the reset period may exist only in the first subfield or may exist only in a subfield about halfway between the first subfield and all the subfields.

In each address section A1, ..., A8, a display data signal is applied to the address electrode X, and scan pulses corresponding to each scan electrode Y are sequentially applied.

In each of the sustain periods S1, ..., S8, a sustain pulse is alternately applied to the scan electrode Y and the sustain electrode Z to form wall charges in the address periods A1, ..., A8. Sustain discharge occurs in the discharge cells.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gradations, each subfield in turn has different sustains at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of pulses can be assigned. In order to obtain luminance of 133 gradations, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

The number of sustain discharges allocated to each subfield may be variably determined according to weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, the plasma display panel may be driven by dividing one frame into eight or more subfields, such as 12 or 16 subfields.

The number of sustain discharges allocated to each subfield can be variously modified in consideration of gamma characteristics and panel characteristics. For example, the gray level assigned to subfield 4 may be lowered from 8 to 6, and the gray level assigned to subfield 6 may be increased from 32 to 34.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

According to the present invention configured as described above, since the ground portion of the filter formed on one surface of the panel is composed of a plurality of metal layers having different thermal expansion coefficients, the work due to defects in manufacturing is simplified, and the filter of the PDP product is broken. And when replacing the filter by the lifetime there is an effect that can be easily replaced.

Claims (4)

A plasma display panel; And In the plasma display device comprising a filter formed on the plasma display panel, And a ground portion facing the ineffective region of the plasma display panel, the ground portion comprising a plurality of layers having different thermal expansion coefficients. The method according to claim 1, The ground unit includes at least one of copper (Cu), nickel (Ni), iron (Fe), manganese (Mn), molybdenum (Mo). The method according to claim 1, And the ground portion comprises two layers. The method according to claim 1, Among the layers constituting the ground portion, And a thermal expansion coefficient that increases as the plasma display panel is adjacent to the plasma display panel.

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