KR100817558B1 - Plasma display device - Google Patents

Abstract

A plasma display device is provided to prevent a paste from being diffused across alignment marks by decreasing a transfer amount of the paste during an offset printing process. A plasma display device includes a PDP(Plasma Display Panel) and an alignment mark(52). The PDP includes front and rear panels. The alignment mark is printed on the PDP. As a pattern on a paste printing region is divided, the alignment mark having first and second portions(52a,52b) is formed. The arrangement position of a COF(Chip On Film) is detected on the first portion. A paste is transferred with a first line-width in a circular shape around a region where the paste is not transferred. The paste-printed region is divided in the second portion with a second line-width around the first portion. The alignment marks are formed at left and right edges of the front panel.

Description

Plasma display device

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

Fig. 2A is a plan view showing a first embodiment of an alignment mark formed on the plasma display panel according to the present invention.

FIG. 2B is a partially enlarged view showing a first embodiment of part A of FIG. 2A.

3A is a plan view showing a first embodiment of an alignment mark formed on the plasma display panel according to the present invention.

3B is a plan view showing a first embodiment of an alignment mark formed on the plasma display panel according to the present invention.

4 is a flowchart showing a first embodiment of a printing process of the plasma display device according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: upper substrate 11: scan electrode

12: sustain electrode 11a, 12a: transparent electrode

11b and 12b: metal bus electrodes 11c and 12c: second black matrix

13: upper dielectric layer 14: protective film

15: first black matrix 20: lower substrate

21: bulkhead 21a: vertical bulkhead

21b: transverse bulkhead 22: address electrode

23 phosphor layer 24 lower dielectric layer

50: plasma display panels 52, 62, 72: alignment mark

The present invention relates to a plasma display device, and more particularly, to a plasma display device in which an alignment mark is easily formed on a plasma display.

Plasma display devices are not only easy to enlarge and thin, but also have a simple structure, which makes them easy to manufacture and has a higher luminance and higher luminous efficiency than other flat panel displays.

Conventionally, the plasma display apparatus forms an alignment mark by using an offset printing process, wherein the paste is transferred to a blanket made of silicon rubber in a roll form, and the paste is adhered to the gravure plate to roll the plasma. In the process of transferring again on the display, an alignment mark is formed.

However, the plasma display apparatus according to the related art has a problem in that when the alignment mark is formed, the amount of paste transferred on the plasma display is increased to spread the paint in the blanket roll advancing direction.

An object of the present invention is to provide a plasma display device in which an alignment mark is easily formed on a plasma display.

A plasma display device of the present invention includes a plasma display panel formed of a front panel and a back panel, and an alignment mark printed on the plasma display panel, wherein the alignment mark is formed by partitioning a pattern of a paste printing portion. do.

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 showing a first embodiment of a plasma display panel according to the present invention.

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

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. Silver may be formed of a metal such as silver (Ag), chromium (Cr), or a lamination of chromium / copper / chromium (Cr / Cu / Cr) or a lamination 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 a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, and the bus electrodes 11b and 12b are enumerated above. In addition to one material, various materials such as photosensitive silver may be possible.

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 first embodiment of the present invention is formed on the upper substrate 10. The first black matrix 15 and the transparent electrodes 11a, which are formed at positions overlapping the partition wall 21 are formed. The second black matrices 11c and 12c formed between 12a and the bus electrodes 11b and 12b may be formed. 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, or may not be simultaneously connected to each other. The first black matrix 15 may not be formed, and only the second black matrices 11c and 12c may be formed.

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.

Here, the bus electrodes 11b and 12b are stacked with the stacked second black matrices 11c and 12c and the transparent electrodes 11a and 12a. In other words, the bus electrodes 11b and 12b are stacked at predetermined distances from one edges of the second black matrices 11c and 12c and stacked with the transparent electrodes 11a and 12a by the predetermined distance.

Accordingly, the bus electrodes 11b and 12b are integrally formed because the bus electrodes 11b and 12b are spaced apart by the predetermined distance from one edges of the second black matrices 11c and 12c. However, the bus electrodes 11b and 12b may be formed in a separate type rather than in an integral form.

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 50PPM to 200PPM based on the weight percent (wt%).

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, 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 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 type having a channel that can be used as an exhaust passage in at least one of a differential partition structure, a vertical partition 21a, or a horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. The barrier rib structure having a groove formed in at least one of the barrier rib structure, the vertical barrier rib 21a or the horizontal barrier rib 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.

On the other hand, in the first embodiment of the present invention is shown and described that each of the R, G and B discharge cells are arranged on the same line, it may be arranged in a different shape. 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.

FIG. 2A is a plan view showing a first embodiment of an alignment mark formed on the plasma display panel according to the present invention, and FIG. 2B is a partially enlarged view showing the first embodiment with respect to part A of FIG. 2A.

2A and 2B, a plasma display apparatus according to the present invention includes a front panel including an upper substrate 10 and a rear panel including a lower substrate 20 and an upper portion. And an alignment mark 52 formed on the substrate 10 and the lower substrate 10.

The front panel has alignment marks 52 formed at left and right edges of the upper substrate 10, and the rear panel has alignment marks 52 formed at lower edges of the lower substrate 20. do.

Here, the alignment mark 52 is printed by pasting the paste onto the upper and lower substrates 10 and 20 by an offset printing process.

Further, the alignment mark 52 is formed according to the arrangement position of the chip on film (COF), and the first portion 52a in which the overall shape has a polygonal outline and the arrangement position of the chip on film (COF) is detected. And a second portion 52b in which the paste printing pattern is partitioned around the first portion 52a.

Here, the first portion 52a of the alignment mark 52 is formed by transferring the paste with the first line width N around the circular portion where the paste is not transferred.

In this case, the first line width (N) is preferably 50um to 150um, the distance from the circular portion of the first portion 52a to the paste printing pattern of the second portion 52 is partitioned, the paste According to the transfer amount of the spreading to the circular portion can be reduced.

In addition, the portion of the first portion 52a to which the paste is not transferred may be formed in a shape other than a circle.

The second portion 52b is spaced apart from the first portion 52 by the first line width N, and the printing pattern of the paste is divided into the second line width M. FIG.

Here, the second line width M is preferably 50 μm to 300 μm, and the printing pattern of the paste may be stably formed in the offset printing process. In addition, when the second line width M is 300 μm or more, the transfer amount of the paste is increased to prevent spreading.

Here, the portion of the second portion 52b in which the paste is not printed has a cross section corresponding to the circular shape of the first portion 52a, and one side surface is formed, and at least one corresponding side thereof is aligned mark 52. It is connected to the outer edge of and formed with at least one vertex.

Therefore, the alignment mark 52 can reduce the transfer amount of the paste printed on the first and second portions 52a and 52b, and can prevent the spread of the paste by reducing the transfer amount of the paste. A pattern may be partitioned to transfer the substantially uniform paste.

In addition, the alignment mark 52 may be partitioned by the printing pattern of the paste of the second portion 52b to be held in contact with at least one vertex of the non-printed portion so that the shape of the outline may be maintained. have.

3A is a plan view showing a second embodiment of an alignment mark formed on the plasma display panel according to the present invention.

Referring to FIG. 3A, the alignment mark 62 of the plasma display device of the present invention includes a first portion 62a indicating a position where COF is disposed, and a second portion 62b on which the paste is transferred.

Here, the first portion 62a is a portion where the paste is not transferred, and the second couple portion 62b is formed by transferring the paste.

In addition, the first shape 62a may be formed in a circle shape and may be formed in a polygonal shape.

The paste is transferred to the second portion 62b and forms the outline of the alignment mark 62. In addition, the second portion 62b may reduce the transfer amount of the paste, and may be formed in a minimum shape through which the arrangement position of the COF may be sensed through the first shape 62a.

Therefore, the alignment mark 62 can reduce the transfer amount of the paste, thereby preventing the paste from spreading.

3B is a plan view showing a first embodiment of an alignment mark formed on the plasma display panel according to the present invention.

Referring to FIG. 3B, the alignment mark 72 of the plasma display device of the present invention includes a first portion 72a indicating the arrangement position of the COF, and a second portion 72b to which the paste is transferred.

Here, the first portion 72a is a portion where the paste is not transferred, and the second portion 72b is formed by transferring the paste.

In addition, the first portion 72a is formed in a circle shape or a polygonal shape, and is formed in the maximum range that can detect the arrangement position of the COF.

The paste is transferred to the second portion 72b and forms the outline of the alignment mark 72. That is, in the second portion 72b, the minimum amount of the paste is transferred so that the first portion 72a is formed in the maximum range.

Therefore, the alignment mark 72 can reduce the transfer amount of the paste, thereby preventing the paste from spreading.

4 is a flowchart showing a first embodiment of a printing process of the plasma display device according to the present invention.

4 and 2A and 2B, the plasma display apparatus according to the present invention arranges the plasma display panel 50 in a printing apparatus (S100).

That is, the plasma display panel 50 is disposed in the printing apparatus (not shown) to form the alignment mark 52 at the position where the chip on film (COF) is disposed.

Here, the printing apparatus is provided with a groove for the alignment mark 52 and a plurality of protrusions inside the groove in the gravure.

Paste is filled in order to form the alignment mark 52 on the plasma display panel 50 disposed in the printing apparatus (S110).

The alignment mark 52 is formed by the recesses and the plurality of projections in the roll direction in which the paste filled in the printing apparatus is formed (S120).

That is, the alignment mark 52 formed on the plasma display panel 50 is printed by the paste of the printing apparatus.

Accordingly, the plasma display device of the present invention can reduce the amount of paste transfer compared to the conventional invention, and can reduce the spread phenomenon during paste transfer by the second portion 52b, thereby reducing the defective rate and manufacturing cost.

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.

The plasma display device according to the present invention divides the printing pattern of the paste into an alignment mark indicating the arrangement position of the COF formed on the plasma display panel, thereby reducing the transfer amount of the paste in the offset printing process, thereby forming the alignment mark. By preventing the paste from spreading, the defect rate and the process yield may be improved.

Claims (8)

A plasma display panel formed of a front panel and a back panel; An alignment mark printed on the plasma display panel; The alignment mark is formed by partitioning the pattern of the paste printing portion, The alignment mark, A first portion in which a placement position of a chip on film (COF) is sensed and the paste is transferred to a first line width around a circular portion where the paste is not transferred; And And a second portion in which the paste printing portion is partitioned with a second line width around the first portion. delete The method of claim 1, wherein the alignment mark, And a plasma display device formed at left and right edge portions of the front panel. The method of claim 1, wherein the alignment mark, And a plasma display device formed at a lower edge portion of the rear panel. delete The method of claim 1, wherein the first line width, 50um to 150um plasma display device. delete The method of claim 1, wherein the second line width, 50um to 300um plasma display device.

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