KR20080020042A - Plasma display device and the manufacturing equipment - Google Patents

Abstract

A plasma display device and a manufacturing method thereof are provided to improve a contrast of the plasma display device by forming a black layer, which is blacker than a barrier rib, on the barrier rib. A plasma display device includes a barrier rib(21) and a black layer(21C). The black layer is formed on the barrier rib and has a color, which is darker than the barrier rib. The black layer contains CoO. A paste for forming the black layer contains CoO at a range between 8% and 10%. The paste for the black layer contains an organic material at a range between 70% and 80%. A barrier rib paste is printed on a substrate and dried. The black layer paste is printed on the substrate. The substrate is plasticized.

Description

Plasma Display Device and Manufacturing Method

1 is a diagram illustrating an embodiment of a structure of a plasma display device;

FIG. 2 is a diagram illustrating an embodiment of a method in which one frame of an image of a plasma display apparatus is time-divided and driven into a plurality of subfields.

3 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display device;

4 is a view showing a plasma display device according to the present invention;

5 is a flowchart illustrating a method of manufacturing a plasma display device according to the present invention;

6A to 6D illustrate a method of manufacturing a plasma display device according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus and a manufacturing method, and more particularly, to a plasma display apparatus and a manufacturing method capable of improving contrast by allowing a black layer darker than the partition to be printed on the partition wall.

In general, a plasma display device is a device for displaying an image including a character or graphics by applying a predetermined voltage to the electrodes installed in the discharge space to generate a discharge, the plasma generated during the discharge to excite the phosphor, the size, light weight and flat It is easy to thin, provides a wide viewing angle vertically and horizontally, and has the advantage that it is possible to realize full color and high brightness.

The plasma display device has a problem that the partition wall constituting the plasma display device is mainly formed in a bright color, so that the contrast characteristic is required to be improved, and the manufacturing cost and yield of the plasma display device are reduced because the manufacturing process of the plasma display device is complicated.

The present invention has been made to solve the above-mentioned problems of the prior art, and as the black layer is formed on the partition wall to form a partition having a black top (black-top) to improve the contrast and simplify the manufacturing process It is an object of the present invention to provide a plasma display device and a manufacturing method.

In the plasma display device according to the present invention for solving the above problems, a barrier layer, and a black layer having a color darker than the barrier rib are formed on the barrier rib, and the black layer is formed of cobalt oxide (CoO). It features.

In this case, the paste forming the black layer includes cobalt-based oxide (CoO) in the range of 8% to 10%, and includes the organic material in the range of 70% to 80%.

In the method of manufacturing a plasma display device of the present invention configured as described above, a barrier layer paste is printed and dried on a substrate, and a paste for forming a black layer on the substrate on which the barrier paste is printed (hereinafter referred to as a black layer paste). It characterized in that it comprises a step of printing, and the step of firing the substrate.

At this time, drying and exposure are performed after the black layer paste is applied, and a sand blasting process is performed before the firing process.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating an embodiment of a structure of a plasma display device, and FIG. 2 is a diagram illustrating an embodiment of a method in which one frame of an image of a plasma display device is time-divided into a plurality of subfields.

Referring to FIG. 1, the plasma display panel includes a scan electrode 11 and a sustain electrode 12, which are sustain electrode pairs formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. Include.

 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 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). In addition, the bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to reduce the voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

On the other hand, as in the embodiment of the present invention, the sustain electrode pairs 11 and 12 have not only a structure in which the transparent electrodes 11a and 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 formed. Since the structure does not use the transparent electrodes 11a and 12a, there is an advantage of lowering the unit cost of panel manufacturing, and the bus electrodes 11b and 12b may be various materials such as photosensitive materials in addition to the materials listed above.

The upper dielectric layer 13 and the protective layer 14 are stacked on the upper substrate 10 on which the scan electrode 11 and the sustain electrode 12 are formed, respectively. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective layer 14 may function to protect the sustain electrode pairs 11 and 12. The upper dielectric layer 13 is protected from sputtering, and the emission efficiency of secondary electrons is increased. In addition, although magnesium oxide (MgO) is generally used for the protective layer 14, Si-MgO added with silicon (Si) may be used. Here, the content of silicon (Si) added to the protective layer 14 may be 50PPM to 200PPM based on the weight percent (wt%).

In addition, the address electrode 22 is formed on the lower substrate 20 in a direction crossing the scan electrode 11 and the sustain electrode 12, and the lower dielectric layer (on the lower substrate 20 on which the address electrode 22 is formed). 24 and the partition wall 21 are formed. On the surfaces of the lower dielectric layer 24 and the partition wall 21 are phosphors 23 which emit light by ultraviolet rays generated during gas discharge and generate visible light.

The partition wall 21 is composed of a vertical partition wall 21a formed in a direction parallel to the address electrode 22 and a horizontal partition wall 21b formed in a direction crossing the address electrode 22 to physically distinguish discharge cells. Ultraviolet rays and visible light generated by the discharge are prevented from leaking to the adjacent discharge cells.

Since the structure of the panel shown in FIG. 1 is only an embodiment of the structure of the plasma display panel according to the present invention, the present invention is not limited to the structure of the plasma display panel shown in FIG. 1. For example, each of the sustain electrode pairs 11 and 12 may include two or more electrode lines, and a structure further including other electrodes is also possible.

In addition, the partition structure of the PDP shown in FIG. 1 represents a close type in which the discharge cells are closed by the vertical partition 21a and the horizontal partition 21b, but the present invention is not limited thereto. A channel-shaped partition structure and a vertical partition wall having a channel usable as an exhaust passage in at least one of the differential partition structure, the vertical partition wall 21a, or the horizontal partition wall 21b having different heights of the horizontal partition wall 21b and the horizontal partition wall 21b ( A grooved partition wall structure having a groove formed in at least one of 21a) or the horizontal partition wall 21b may be possible. In addition, a structure such as a fish bone (Fish Bone) having a predetermined interval on the vertical partition wall 21a and having a protrusion is also 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 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.

FIG. 2 is a diagram illustrating an embodiment of a method in which one frame of an image of a plasma display panel is time-divided and driven into a plurality of subfields.

Referring to FIG. 2, a unit frame may be time-divisionally driven to a predetermined number, for example, eight subfields SF1,..., SF8 to express the gray level of an image. Each subfield SF1, ..., SF8 is divided into a reset section (not shown), an address section A1, ..., A8, and a sustain section S1, ..., S8. .

In each address section A1, ..., A8, a data signal is applied to the address electrode X, and corresponding scan pulses are sequentially applied to each scan electrode Y. FIG. Sustain pulses are alternately applied to the scan electrode Y and the sustain electrode Z in each of the sustain periods S1, ..., S8, so that the discharge cells selected in the address periods A1, ..., A8 are alternately applied. Causes sustain discharge.

Here, the reset section may be omitted in at least one of the plurality of subfields. For example, the reset section may exist only in the first subfield, or may exist only in the middle subfield of the first subfield and all subfields.

The luminance of the plasma display panel is proportional to the number of sustain discharges in the sustain 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 a different sustain pulse at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of can be assigned. Alternatively, in order to obtain 133 gray levels, sustain discharge is performed by addressing cells during the subfield 1 period, the subfield 3 period, and the subfield 8 period.

Meanwhile, the number of sustain discharges allocated to each subfield may be variably determined according to the weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 2, 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 or the like, such as 12 or 16 subfields.

In addition, 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.

3 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display panel.

Referring to FIG. 3, the plurality of discharge cells 15 are provided at the intersections of the scan electrodes Y1 to Yn, the sustain electrodes Z1 to Zn, and the address electrodes X1 to Xn, respectively. Each of the plurality of scan electrodes Y1 to Yn is sequentially driven by the scan driver 40, and the plurality of sustain electrodes Z1 to Zn are commonly driven while receiving a sustain signal supplied from the sustain driver 60. . In addition, the address electrodes X1 to Xn receive a data signal synchronized with a scan signal from the address driver 50.

Meanwhile, since the electrode arrangement and driving method shown in FIG. 3 are only one embodiment of the plasma display 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. 3. For example, a dual scan method in which two scan electrodes of the scan electrodes Y1 to Yn are simultaneously scanned is also possible. Further, the address electrodes X1 to Xn are divided into odd address electrodes X1, X3, ..., Xn-1 and even-numbered address electrodes X2, X4, ..., Xn, and the odd address driver It is also possible to arrange the electrodes having the even-th address and receiving the driving signals.

As shown in FIG. 4, the plasma display device includes an address electrode 22 and a dielectric layer 24 on a glass substrate 20, a partition wall 21 on the dielectric layer, and a color darker than the partition wall on the partition wall. The black layer 21c which has is formed.

In this case, the black layer paste for forming the black layer 21c is made of black powder and includes cobalt-based oxide (CoO), so that the upper part of the partition wall 21 becomes black, thereby improving contrast characteristics of the plasma display device. Can be.

As described above, when the black layer 21c having a color darker than the partition wall is formed on the partition wall 21, it is possible to prevent the light generated during discharge from being diffused into another discharge space, and to reduce the overall brightness without greatly reducing the overall brightness. The reflectance of light incident from the front of the display device may be lowered.

In particular, when the reflectance of the plasma display device is lowered, it is possible to provide clear image quality without deterioration of image quality in a bright environment.

The black layer paste for forming the black layer 21c should contain cobalt-based oxide within 8% to 10%, and contain organic material within 70% to 80%.

For example, the black layer paste may contain about 9.8% of cobalt oxide, and may include 76.2% of organic matter and 23.8% of inorganic matters in the paste.

At this time, the black layer 21c should be formed so as not to exceed the upper width of the partition wall 21. If the black layer is formed wider than the partition wall, the black layer 21c lowers the aperture ratio of the discharge cell, thereby lowering the brightness and thereby lowering the image quality. It should be formed within.

In particular, since the discharge is not generated in the upper part of the partition 21, a black layer is formed on the partition to have a black top, thereby improving contrast without affecting the discharge.

5 is a flowchart illustrating a method of manufacturing a plasma display device according to the present invention, and FIGS. 6A to 6D are views illustrating a method of manufacturing a plasma display device according to the present invention.

As shown in FIG. 5, in order to manufacture the plasma display device of the present invention configured as described above, the address electrode 22 and the dielectric layer 24 are sequentially formed on the substrate g (S1 and S2).

The partition paste p1 is printed (S3) and dried (S4) on the substrate g on which the address electrode 22 and the dielectric layer 24 are formed. The partition paste is composed of a glass frit, a filler, a solvent, a binder, and the like, and as the glass frit, a PbO-B ₂ O ₃ -SiO ₂ system may be used. Al ₂ O ₃ or / and TiO ₂ may be used as the filler. As the solvent, BCA, BC or / and Terpineol may be used, and as the binder, ethyl cellulose may be used.

When the partition paste p1 is dried, the black layer paste p2 is sequentially printed (S5) and dried (S6). The black layer paste includes cobalt-based oxide (CoO). For example, the black layer paste includes about 9.8% cobalt-based oxide, and 76.2% of organic material and 23.8% of inorganic material. The black layer 21c having a color darker than the partition wall may be formed on the partition wall 21 without being detached.

At this time, as shown in Figure 6a, the black layer paste (p2) should be applied to have a thickness within the range of about 4㎛ 5㎛ after drying.

Subsequently, an exposure process S7 is performed. To this end, as shown in FIG. 6B, a photo having the partition wall 21 pattern on the substrate g on which the partition paste p1 and the black layer paste p2 are applied. The mask M is positioned and irradiated with light to perform an exposure process. In this case, an exposure process is performed by irradiating light of about 300 mJ onto the substrate g.

When the exposure step S7 is performed, the exposed portion a to which light is irradiated is cured by light curing and no elasticity. The non-exposed portion b is elastic because no photocuring occurs. Will have

After the exposure process S7, a sand blast process S8 is performed to cut the partition paste p1 and the black layer paste p2, and the abrasive used in the sand blast process is 28 μm to 51 μm. Silicon oxides (SiO ₂ ) in the form of round balls having a diameter within the range are mainly used.

As shown in FIG. 6C, since the exposed portion a is hardened and has no elasticity, when the abrasive is injected onto the substrate g during the sand plaster process, the exposed portion a is scraped off by the abrasive, and the non-exposed portion b is Since it has elasticity, even when the abrasive is injected, the impact caused by the abrasive collision is absorbed and the partition paste p1 and the black layer paste p2 are not scraped off.

After the sand blast process (S8) is performed as described above, the firing process (S9) is performed. At the time of a baking process, the said board | substrate g is heated and baked at the high temperature of 400 degreeC or more.

As shown in FIG. 6D, when the firing process S9 is completed, a partition wall 21 having the same pattern as that of the photomask M is formed, and a black layer 21c is formed on the partition wall to form a black top ( black-top).

As described above, when the black layer 21c is formed on the partition 21 to form a black top structure, the contrast can be increased by lowering the reflectance of light on the front surface of the plasma display device without preventing a decrease in luminance. Simplification of the process is also possible.

That is, in order to cut the existing dried partition wall paste p1, the dry film according to the partition wall pattern is separately laminated, and the exposure and development processes are performed, whereas in the present invention, exposure is performed using the photo mask M during exposure. This simplifies the process.

In particular, in order to form a black matrix that performs the function of the black layer 21c, the black matrix is formed through a separate process after the partition wall 21 is formed. However, in the present invention, the paste for forming the black layer is formed when the partition wall is formed. The process can be simplified by applying the upper layer of the barrier paste and performing sand blasting.

As described above, the plasma display device and the manufacturing method according to the present invention have been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and those skilled in the art within the technically protected scope of the present invention. Application is possible by.

Plasma display device and manufacturing method of the present invention configured as described above is a black layer having a darker color than the partition wall formed on the partition wall can improve the contrast (contrast) without lowering the brightness and at the same time simplify the process for forming the partition wall There is an effect that can reduce the manufacturing cost and shorten the manufacturing period.

Claims (6)

Bulkheads; A black layer having a color darker than the partition on the partition, And the black layer is formed of CoO. The method according to claim 1, The paste for forming the black layer is a plasma display device, characterized in that containing CoO within 8% to 10% range. The method according to claim 1, The paste forming the black layer comprises organic material within 70% or more and 80% or less. Printing and drying the partition paste on the substrate; Printing the black layer paste on the substrate on which the barrier paste is printed; And firing the substrate. The method according to claim 4, Drying and exposure are carried out after the black layer paste is applied. The method according to claim 4, Sandblasting is performed before the firing process, characterized in that the manufacturing method of the plasma display device.

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