KR20100117911A - Plasma display panel device - Google Patents

Abstract

In order to facilitate shielding of electromagnetic waves emitted from a plasma display panel when a plasma display panel is driven, the plasma display device of the present invention includes a plasma display panel in which upper and lower substrates are bonded together with a predetermined gap therebetween, An EMI shielding member is formed on the front surface of the substrate with a curved surface in a groove formed in a mesh type.

Description

Plasma display panel device

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plasma display apparatus, and more particularly, to a plasma display apparatus in which an electromagnetic wave emitted from a plasma display panel is easily shielded when a plasma display panel is driven.

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 (Vacu μm 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.

Such a plasma display panel may adversely affect a user and a peripheral device by electromagnetic waves emitted from inside the plasma display panel when the plasma display panel is driven.

In order to solve this problem, the blackened electromagnetic wave shielding film has been used as a whole, but the resistance value of the conductive substance due to the blackening treatment has been increased to lower the electromagnetic wave shielding efficiency. Recently, electromagnetic wave shielding efficiency is improved by removing the electromagnetic wave shielding film, Research is underway to ensure sufficient visibility and driving characteristics for users to watch while reducing manufacturing costs.

An object of the present invention is to provide a plasma display device in which electromagnetic waves emitted from a plasma display panel can be easily shielded when a plasma display panel is driven.

The plasma display device of the present invention includes a plasma display panel in which an upper substrate and a lower substrate are bonded together with a predetermined gap therebetween. A front surface of the upper substrate is covered with a EMI shielding A member is formed.

According to the plasma display apparatus of the present invention, a groove is formed in the front surface of an upper substrate among an upper substrate and a lower substrate which are adhered to a plasma display panel at a predetermined interval, and an EMI shielding member having a curved surface is formed, And the thickness of the central portion of the EMI shielding member is smaller than the thickness of the groove formed in the upper substrate. Thus, damage to the EMI shielding member during the plasma display panel manufacturing process can be prevented.

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

1 is a perspective view illustrating a structure of a plasma display panel according to a first embodiment of the present invention.

Referring to 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 (ITO), and the bus electrodes 11b and 12b. ) May be formed of a metal such as silver (Ag), chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). 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 first embodiment of the present invention, the sustain electrode pairs 11 and 12 have not only a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also without the transparent electrodes 11a and 12a. Only the bus electrodes 11b and 12b may be constituted. 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. The black matrix (BM, 15) is arranged to serve as a blocking function and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the first embodiment of the present invention is formed on the upper substrate 10. The first black matrix 15 and the transparent electrodes 11a and 12a are formed at positions overlapping the partition wall 21. ) And 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, 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 simultaneously formed and thus not physically connected. .

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 physically separated.

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, magnesium oxide (MgO) may be generally used for the protective film 14, and Si-MgO to which silicon (Si) is added may be used.

Here, the content of silicon (Si) added to the protective film 14 may be 60PPM to 200PPM based on the weight percent.

On the other hand, the address electrode 22 is formed in the direction crossing the scan electrode 11 and the sustain electrode 12. In addition, the lower dielectric layer 23 and the 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 discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

In the first 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 the first embodiment of the present invention, although each of the R, G, and B discharge cells is 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 simplified diagram illustrating an electrode arrangement of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 2, the plurality of discharge cells constituting the plasma display panel is preferably arranged in a matrix form as shown in FIG. 2. 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. 2 is only a first 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. 2. For example, a dual scan method in which two scan electrode lines among the scan electrode lines Y1 to Ym are simultaneously scanned is possible. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down or left and right in the center portion of the panel.

3 is a timing diagram of a method of time-division driving by dividing one frame into a plurality of subfields according to the first embodiment of the present invention.

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 the first 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 gray levels, 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, a 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.

4 is a timing diagram illustrating a driving signal for driving a plasma display panel according to a first embodiment of the present invention.

The subfield is a wall formed by a pre-reset section and a pre-reset section for forming positive wall charges on the scan electrodes Y and negative wall charges on the sustain electrodes Z. It may include a reset section for initializing the discharge cells of the entire screen by using the charge distribution, an address section for selecting the discharge cells, and a sustain section for maintaining the discharge of the selected discharge cells. have.

The reset section includes a setup section and a setdown section. In the setup section, rising ramp waveforms (Ramp-up) are simultaneously applied to all scan electrodes to generate fine discharges in all discharge cells. Thus, wall charges are generated. In the set-down period, a falling ramp waveform (Ramp-down) falling at a positive voltage lower than the peak voltage of the rising ramp waveform (Ramp-up) is simultaneously applied to all the scan electrodes (Y), thereby eliminating discharge discharge in all the discharge cells. Generated, thereby eliminating unnecessary charges during wall charges and space charges generated by the setup discharges.

In the address period, a scan signal having a negative scan voltage Vsc is sequentially applied to the scan electrode, and at the same time, a positive data signal is applied to the address electrode X. The address discharge is generated by the voltage difference between the scan signal and the data signal and the wall voltage generated during the reset period, thereby selecting the cell. On the other hand, in order to increase the efficiency of the address discharge, a sustain bias voltage Vzb is applied to the sustain electrode during the address period.

During the address period, the plurality of scan electrodes Y may be divided into two or more groups, and scan signals may be sequentially supplied to each group, and each of the divided groups may be further divided into two or more subgroups and sequentially by the subgroups. Scan signals can be supplied. For example, the plurality of scan electrodes Y is divided into a first group and a second group, and scan signals are sequentially supplied to scan electrodes belonging to the first group, and then scan electrodes belonging to the second group Scan signals may be supplied sequentially.

According to the first embodiment of the present invention, the plurality of scan electrodes Y is divided into a first group located at an even number and a second group located at an odd number according to a position formed on a panel. In another embodiment, the display panel may be divided into a first group located above and a second group located below the center of the panel.

The scan electrodes belonging to the first group divided by the above method are further divided into a first subgroup located at an even number and a second subgroup located at an odd number, or the first group. The first subgroup positioned above and the second group positioned below may be divided based on the center of the.

In the sustain period, a sustain pulse having a sustain voltage Vs is alternately applied to the scan electrode and the sustain electrode to generate sustain discharge in the form of surface discharge between the scan electrode and the sustain electrode.

The width of the first sustain signal or the last sustain signal among the plurality of sustain signals alternately supplied to the scan electrode and the sustain electrode in the sustain period may be greater than the width of the remaining sustain pulses.

After the sustain discharge occurs, an erase period for erasing the wall charge remaining in the scan electrode or the sustain electrode of the selected ON cell in the address period by generating a weak discharge may be further included after the sustain period.

The erase period may be included in all or some of the plurality of subfields, and the erase signal for the weak discharge is preferably applied to the electrode to which the last sustain pulse is not applied in the sustain period.

The cancellation signal is a ramp-type signal that gradually increases, a low-voltage wide pulse, a high-voltage narrow pulse, an exponential signal, or half Sinusoidal pulses can be used.

In addition, a plurality of pulses may be sequentially applied to the scan electrode or the sustain electrode to generate the weak discharge.

The driving waveforms shown in FIG. 4 are first examples of signals for driving the plasma display panel according to the present invention. The present invention is not limited to the waveforms shown in FIG. 4. For example, the pre-reset period may be omitted, and the polarity and the voltage level of the driving signals illustrated in FIG. 4 may be changed as necessary. After the sustain discharge is completed, an erase signal for erasing wall charge may be applied to the sustain electrode. May be authorized. In addition, the single sustain driving may be performed by applying the sustain signal to only one of the scan electrode (Y) and the sustain (Z) electrode to generate a sustain discharge.

The driving section of the plasma display panel may be divided into a power-on sequence section and a normal operation section. The waveforms of the driving signals supplied from the power-on sequence section and the normal operation section may be the same or different as necessary.

That is, when power is supplied to the plasma display device (Power ON), a power-on for preparing a normal operation of the device without displaying an image on the panel for a predetermined time or until the driving voltage to be supplied to the panel reaches a normal level. A power on sequence is performed. Thereafter, the image is displayed by the driving signals supplied to the panel in the normal operation section.

In addition, even before the power supply to the plasma display device is cut off, a power on sequence similar to the power on sequence exists to smoothly terminate the power supply to the driving circuit or the panel.

For example, during a predetermined time after power is supplied to the plasma display device, the data signal is not applied to the panel because the display enable signal has a value of "0" which is a low level. , No image is displayed on the panel. After the predetermined time has elapsed, if the disabling enable signal has a value of "1" which is a high level, the data signal is applied to the panel, and the image is displayed on the panel. In addition, during a predetermined time before the power supply to the plasma display device is terminated, the disabling enable signal again has a low level of "0", and thus no image is displayed on the panel.

FIG. 5 is a plan view showing a front surface of an upper substrate according to a first embodiment of the present invention, and FIG. 6 is a sectional view showing a first embodiment of an upper substrate.

Referring to FIG. 5, the upper substrate 100 has an EMI shielding member 110 formed on a front surface of which an image is implemented.

That is, the EMI shield member 110 to prevent the interference of electromagnetic waves emitted to the outside during the image implementation.

Here, the EMI shield member 110 is formed in the form of a mesh (mesh) type.

Referring to FIG. 6, FIG. 6 shows a cross section in the A direction in FIG. 5.

Referring to FIG. 6, the EMI shielding member 110 is embedded with a curved surface in a groove 105 formed in a mesh type rectangular shape.

Here, the EMI shield member 110 forms a curved surface and is embedded in the groove 105.

EMI shield member 110 is formed when the groove 105 is a rectangular shape, the central portion is formed lower than both ends.

That is, it is preferable that the center portion thickness a and the end portion thickness b of the EMI shielding member 110 are 0.5 to 0.9 times the end portion thickness b. When the central portion thickness a of the EMI shielding member 110 is greater than the thickness of the end portion b, damage to the electrodes and the dielectric formed on the back surface of the upper substrate 110 during the plasma display panel process Because there may be.

The width of the end portion of the EMI shielding member 110 is preferably 10 to 30 um and the width of the EMI shielding member 110 is preferably 30 to 50 um which is the same as the width c of the groove 105 Do.

That is, the width c of the groove 105 and the EMI shielding member 110 is most preferable for the interference of the electromagnetic wave. If the width c is large, the shielding function against the interference of the electromagnetic wave is weakened, The overlapping phenomenon of images may occur.

Therefore, the EMI shielding member 110 shields electromagnetic waves emitted from the plasma display panel when the plasma display panel is driven.

The EMI shielding member 110 is formed of a bonding material combined with any one of silver (Ag), copper (Cu), aluminum (Al), silver (Ag), copper (Cu) Would be desirable.

Also, the EMI shielding member 110 may be a conductive material such as silver (Ag), or may be a material that is prevented from being damaged during the firing process.

7 is a cross-sectional view illustrating a second embodiment of a cross section of an upper substrate.

Referring to FIG. 7, the upper substrate 200 has an EMI shield member 210 embedded in a groove 205.

The EMI shielding member 210 has a curved surface along the curved surface of the groove 205, and is embedded.

In the present embodiment, the groove 205 has a curved cross section, but the central portion may be formed deeper than the side portion in the shape of a pyramid.

The central thickness a_1 of the EMI shield member 210 is buried smaller than the maximum depth b_1 of the groove 205.

Here, the central portion thickness a_1 is preferably 0.5 to 0.9 times the maximum depth b_1 of the groove 205, so that shock and shake are minimized when the plasma display panel is moved in a predetermined process.

In addition, the width of the EMI shield member 210 is preferably 30um to 50um, and is formed to be the same as the thickness of the groove 205.

In the plasma display device of the present invention, the EMI shielding member, which is curved in the form of a mesh, is embedded in the groove on the front surface of the upper substrate, so that damage to the EMI shielding member does not occur during the process of the panel, It is possible to prevent damage to electrodes, dielectrics, etc. formed on the back surface of the upper substrate.

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 of the embodiments of the present invention will not depart from the scope of the present invention.

1 is a perspective view illustrating a structure of a plasma display panel according to a first embodiment of the present invention.

2 is a simplified diagram illustrating an electrode arrangement of a plasma display panel according to a first embodiment of the present invention.

3 is a timing diagram of a method of time-division driving by dividing one frame into a plurality of subfields according to the first embodiment of the present invention.

4 is a timing diagram illustrating a driving signal for driving a plasma display panel according to a first embodiment of the present invention.

5 is a plan view illustrating a front surface of an upper substrate according to the first embodiment of the present invention.

6 is a cross-sectional view illustrating a first embodiment of a cross section of an upper substrate.

7 is a cross-sectional view illustrating a second embodiment of a cross section of an upper substrate.

Claims (10)

An upper substrate and a lower substrate includes a plasma display panel bonded to each other at a predetermined interval, On the front of the upper substrate, Plasma display device characterized in that the EMI shield member is formed with a curved surface formed in the groove formed in the mesh (mesh) type. The method of claim 1, The groove is formed in a rectangular shape, The EMI shield member, Plasma display device, characterized in that the thickness of the center portion is smaller than the thickness of the end portion. The method of claim 2, wherein the central portion thickness, Plasma display device, characterized in that 0.5 to 0.9 times the thickness of the end portion. The method of claim 2, wherein the end thickness is, Plasma display device, characterized in that 10um to 30um. The width of the EMI shielding member, Plasma display device, characterized in that 30um to 50um. The method of claim 1, wherein the EMI shield member, Plasma display device, characterized in that the electrically conductive material. The method of claim 6, wherein the EMI shield member, Ag, Cu, Al, or any one of Ag, Cu, and Al. The method of claim 1, The groove is a cross-sectional shape or is formed in a pyramid shape, The EMI shield member, And a center portion thickness smaller than the depth of the groove. The method of claim 8, wherein the central portion thickness, Plasma display device, characterized in that 0.5 to 0.9 times the depth of the groove. 10. The method of claim 9, wherein the width of the EMI shield member, Plasma display device, characterized in that 30um to 50um.

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