JP4962323B2 - Plasma display panel - Google Patents

Description

  The present invention relates to an AC type plasma display panel used for a display device or the like.

  A typical AC surface discharge type panel as a plasma display panel (hereinafter abbreviated as “panel”) has a large number of discharge cells formed between a front substrate and a rear substrate which are arranged to face each other. On the front substrate, a plurality of display electrode pairs including a pair of scan electrodes and sustain electrodes are formed in parallel to each other, and a dielectric layer and a protective layer are formed so as to cover the display electrode pairs. A plurality of parallel data electrodes, a dielectric layer covering them, and a plurality of barrier ribs are formed on the rear substrate in parallel with the data electrodes. The surface of the dielectric layer and the side surfaces of the barrier ribs are formed on the rear substrate. A phosphor layer is formed on the substrate. Then, the front substrate and the rear substrate are disposed opposite to each other so that the display electrode pair and the data electrode are three-dimensionally crossed and sealed, and a discharge gas is sealed in the internal discharge space. Here, a discharge cell is formed at a portion where the display electrode pair and the data electrode face each other. Color display is performed by generating ultraviolet rays by gas discharge inside each discharge cell of such a panel, and exciting and emitting phosphors of red, green, and blue colors with the ultraviolet rays.

In the panel having the above configuration, when the front substrate and the rear substrate are disposed to face each other, the protective layer of the front substrate and the barrier ribs of the rear substrate come into contact with each other. There was a thing. In order to solve such a problem, there are a method for eliminating the partition wall strength deficiency and suppressing the partition wall defect (for example, see Patent Document 1) and a method for providing a buffer material on the top of the partition wall (for example, Patent Document 2). It is disclosed.
JP 2000-1333 A JP 2003-297236 A

  However, even in the above method, it is difficult to completely eliminate the defect of the partition walls. In particular, with the recent increase in screen size and definition of panels, the number of defective portions per panel tends to increase, and the probability of defects occurring during the transportation of the panel or plasma display device is increasing. Therefore, an early countermeasure against the defect of the partition wall is desired.

  The present invention has been made in view of these problems, and suppresses defects in the barrier ribs and displays a high-quality image without causing malfunction of the discharge cells even when the barrier ribs are defective. It aims at providing the panel which can be used.

To achieve the above object, the panel of the present invention comprises a front substrate having scan electrodes, sustain electrodes and black stripes, a rear substrate having data electrodes and barrier ribs, and scan electrodes, sustain electrodes and data electrodes. The panel is configured to face each other so as to cross three-dimensionally. Two scanning electrodes and two sustain electrodes are alternately formed, and a black stripe is a first black stripe formed between adjacent sustain electrodes. And a second black stripe formed between adjacent scanning electrodes, and the barrier rib is formed in parallel with the data electrode, and the height is lower than the vertical barrier rib and intersects with the vertical barrier rib. and a formed transverse bulkhead as a vertical barrier ribs and the front substrate at the position of the first black stripe abuts the first black stripes are formed with black layer and a white layer, a second blanking Click stripe is characterized in that it is formed by a black layer. With this configuration, it is possible to provide a panel that can suppress defects in the barrier ribs and display a high-quality image without causing defective operation of the discharge cells even when the barrier ribs are defective.

  The first black stripe of the panel of the present invention may have a structure in which a striped white layer is laminated on a striped black layer.

  The first black stripe of the panel of the present invention may have a structure in which a white layer is stacked in an island shape at a position facing a vertical partition wall on a striped black layer.

  According to the present invention, it is possible to provide a panel that can suppress a defect of a partition wall and can display a high-quality image without causing a malfunction of a discharge cell even when the partition wall is defective. It becomes possible.

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

(Embodiment)
FIG. 1 is an exploded perspective view showing a structure of panel 10 according to the embodiment of the present invention. The panel 10 is configured by disposing the front substrate 21 and the rear substrate 31 so as to face each other and sealing the periphery using a sealing member (not shown), and a large number of discharge cells are formed therein. Yes.

  On the glass front substrate 21, a plurality of pairs of display electrodes 24 including a pair of scanning electrodes 22 and sustaining electrodes 23 are formed in parallel to each other. Two scanning electrodes 22 and two sustaining electrodes 23 are alternately formed. A first black stripe 25 is formed between adjacent sustain electrodes 23, and a second black stripe 26 is formed between adjacent scan electrodes 22. Therefore, on the front substrate 21, the scan electrode 22, the sustain electrode 23, the first black stripe 25, the sustain electrode 23, the scan electrode 22, the second black stripe 26, the scan electrode 22, the sustain electrode 23, and the first black The stripe 25, the sustain electrode 23, the scan electrode 22, the second black stripe 26,... Are formed.

  The scanning electrode 22 includes a transparent electrode 22a and an opaque bus electrode 22b. Similarly, sustain electrode 23 includes transparent electrode 23a and bus electrode 23b.

The transparent electrodes 22a and 23a are formed by forming a conductive metal oxide such as ITO, SnO ₂ , or ZnO in a band shape on the front substrate 21. The bus electrode 22b is formed by stacking a black layer 22c as a lower layer and a white layer 22d as an upper layer, and the bus electrode 23b is similarly formed by stacking a black layer 23c and a white layer 23d. The black layers 22c and 23c are provided to make the display electrode pair 24 appear black when the panel is viewed from the display surface side, and a black material is placed on each of the transparent electrodes 22a and 23a. It is formed by stacking narrower than the width. The white layers 22d and 23d are provided to increase the conductivity, and are formed by laminating a conductive material containing Ag on the black layers 22c and 23c.

  The first black stripe 25 is formed by laminating a black layer 25c and a white layer 25d. The second black stripe 26 is formed of the black layer 26c, and the white layer is not laminated. The black layers 25c and 26c are provided to make the first black stripe 25 and the second black stripe 26 appear black when the panel is viewed from the display surface side, and a black material is formed on the front substrate 21. It is a thing. The white layer 25d is provided to ensure the thickness of the first black stripe 25, and is formed using the same material as the white layers 22d and 23d in the present embodiment.

  A dielectric layer 27 is formed so as to cover the display electrode pair 24, the first black stripe 25, and the second black stripe 26, and a protective layer 28 is formed on the dielectric layer 27.

  A plurality of data electrodes 32 are formed in parallel to each other on a glass back substrate 31. The data electrode 32 is made of a conductive material containing Ag as a main component. A dielectric layer 33 is formed so as to cover the data electrode 32.

  On the dielectric layer 33, a grid-like barrier rib 34 having a vertical barrier rib 34 a parallel to the data electrode 32 and a horizontal barrier rib 34 b intersecting the vertical barrier rib 34 a is formed. In this embodiment, the height of the vertical barrier ribs 34a is slightly higher than the height of the horizontal barrier ribs 34b in order to prevent mutual interference between discharge cells corresponding to the adjacent data electrodes 32. On the surface of the dielectric layer 33 and the side surfaces of the partition walls 34, phosphor layers 35 that emit red, green, and blue light are formed.

  Then, the front substrate 21 and the rear substrate 31 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 are three-dimensionally crossed, and a discharge cell is formed at a portion where the display electrode pair 24 and the data electrode 32 face each other. . The front substrate 21 and the rear substrate 31 are sealed using low-melting glass at a position outside the image display area where the discharge cells are formed, and a discharge gas is sealed in the internal discharge space.

  Here, in the present embodiment, since the height of the vertical partition wall 34a is slightly higher than the height of the horizontal partition wall 34b, when the front substrate 21 and the rear substrate 31 are disposed to face each other, The protective layer 28 and the vertical partition wall 34a come into contact with each other.

  FIG. 2 is an arrangement diagram of each electrode and black stripe of panel 10 in accordance with the exemplary embodiment of the present invention. Two n scanning electrodes 22 and n sustain electrodes 23 that are long in the row direction are alternately arranged, and m data electrodes 32 that are long in the column direction are arranged so as to intersect with them. A discharge cell is formed at a portion where the pair of scan electrode 22 and sustain electrode 23 and one data electrode 32 intersect, and an image display area is formed by m × n discharge cells. As described above, the first black stripe 25 is formed between the adjacent sustain electrodes 23, and the second black stripe 26 is formed between the adjacent scan electrodes 22. Therefore, on the front substrate 21, the scan electrode 22, the sustain electrode 23, the first black stripe 25, the sustain electrode 23, the scan electrode 22, the second black stripe 26, the scan electrode 22, the sustain electrode 23, and the first black The stripe 25, the sustain electrode 23, the scan electrode 22, the second black stripe 26,... Are formed.

  Next, a method for manufacturing the panel 10 will be described. FIG. 3 is a diagram showing a method for manufacturing front substrate 21 of panel 10 in the embodiment of the present invention.

First, a plurality of rows of conductive materials such as ITO (Indium Tin Oxide) or SnO ₂ having a thickness of about 1200 mm are formed on the surface of the front substrate 21 using a known technique such as vapor deposition or sputtering. Thus, the transparent electrodes 22a and 23a are formed (FIG. 3A).

  Next, precursors of black layers 22c and 23c having a film thickness of about 5 μm are formed on the transparent electrodes 22a and 23a by using known techniques such as screen printing and photolithography. At this time, the precursors of the black layers 25c and 26c of the first black stripe 25 and the second black stripe 26 are also formed at the same time. On top of this, precursors of white layers 22d and 23d made of Ag and having a thickness of about 7 μm are formed. At this time, the precursor of the white layer 25d of the first black stripe 25 is also formed simultaneously (FIG. 3B).

  In FIG. 3B, members other than the front substrate 21 and the transparent electrodes 22a and 23a are precursors as described above, but are formed by sintering the precursors as symbols indicating the precursors. Reference numerals indicating members are used.

  By firing the front substrate 21 on which such a precursor is formed at a peak temperature of 550 to 600 ° C., the precursors of the respective black layers and white layers are sintered, and the buses of the scan electrodes 22 and the sustain electrodes 23 are sintered. Electrodes 22b and 23b, and a first black stripe 25 and a second black stripe 26 are formed. The thickness of the black layer after sintering is about 1 μm, and the thickness of the white layer is about 5 μm. Accordingly, the bus electrodes 22b and 23b and the first black stripe 25 have a thickness of about 6 μm, and the second black stripe 26 has a thickness of about 1 μm (FIG. 3C).

  Then, a precursor of the dielectric layer 27 is formed on the front substrate 21 on which the scan electrode 22, the sustain electrode 23, the first black stripe 25, and the second black stripe 26 are generated by a known technique such as a die coat printing method. . By sintering the precursor of the dielectric layer 27, the dielectric layer 27 having a thickness of about 39 μm is generated. Further thereon, a protective layer 28 having a thickness of about 8000 mm is produced by a known technique such as sputtering (FIG. 3D).

  In this manner, the first black stripe 25 and the second black stripe 26 can be formed without adding a new process to the process of forming the bus electrodes 22b and 23b.

  The surfaces of the dielectric layer 27 and the protective layer 28 formed in this way are not completely flat and have irregularities. The transparent electrodes 22a and 23a are very thin and hardly affect the shapes of the surfaces of the dielectric layer 27 and the protective layer 28. However, since the black layer and the white layer are relatively thick, the dielectric layer 27 and the protective layer Unevenness is produced on the surface of 28. In the present embodiment, the surface of the protective layer 28 has the bus electrodes 22b and 23b and the first black stripe 25 compared to the position A intermediate between the scan electrode 22 and the sustain electrode 23 that form the display electrode pair 24. It has been confirmed that the height is increased by about 2 μm at the position of about 2 μm and about 0.1 μm at the position of the second black stripe 26.

  Next, a method for manufacturing the back substrate 31 will be described. FIG. 4 is a diagram showing a method for manufacturing the back substrate 31 of the panel 10 according to the embodiment of the present invention.

  First, using a known technique such as a screen printing method or a photolithography method, a conductor material mainly composed of Ag is applied on the back substrate 31 in stripes at a predetermined interval to form a precursor of the data electrode 32. To do. Thereafter, the back substrate 31 is baked to form the data electrodes 32 having a film thickness of about 2.5 μm (FIG. 4A).

  Subsequently, a low melting point glass paste is applied on the back substrate 31 on which the data electrodes 32 are formed, and the back substrate 31 is baked to form a dielectric layer 33 having a thickness of about 10 μm (FIG. 4B). ).

  Subsequently, a photosensitive glass paste is applied on the back substrate 31 on which the dielectric layer 33 is formed so as to have a film thickness of about 270 μm, and then dried and exposed to the shape of the horizontal barrier ribs 34b. Further, a photosensitive glass paste is further applied thereon so as to have a film thickness of about 37 μm, followed by drying, and this time, exposure is performed in the shape of the vertical partition wall 34a. Thereafter, etching and baking are performed to form a partition wall 34 having a vertical partition wall 34a having a height of about 120 μm and a horizontal partition wall 34b having a height of about 104 μm (FIG. 4C).

  Then, a phosphor ink containing any one of a red phosphor, a green phosphor, and a blue phosphor is applied to the wall surface of the partition wall 34 and the surface of the dielectric layer 33. Thereafter, drying and baking are performed to form a phosphor layer 35 that emits light in each color (FIG. 4D).

  FIG. 5 is a cross-sectional view of panel 10 in accordance with the exemplary embodiment of the present invention, and is an enlarged view of a cut surface in a plane parallel to data electrode 32. Since the transparent electrodes 22a and 23a are very thin and the protective layer 28 is also very thin, the transparent electrodes 22a and 23a and the protective layer 28 are omitted in FIG. Further, the phosphor layer 35 is also omitted for easy viewing of the drawing.

  As described above, when the front substrate 21 and the rear substrate 31 are arranged to face each other, the protective layer 28 on the dielectric layer 27 and the vertical partition wall 34a come into contact with each other. In this embodiment, the protective layer 28 is shown in FIG. Thus, the vertical partition wall 34 a abuts at the position of the first black stripe 25.

  The reason for contact at this position is that the first black stripe 25 is formed by laminating the black layer 25c and the white layer 25d, and the surfaces of the dielectric layer 27 and the protective layer 28 are raised at this position. Because it is. Of course, since the bus electrodes 22b and 23b are also formed by laminating the black layers 22c and 23c and the white layers 22d and 23d, the bus electrodes 22b and 23b may contact each other. However, the height of the vertical partition wall 34a at the position of the first black stripe 25 tends to be higher than the height of the vertical partition wall 34a at the position of the bus electrodes 22b and 23b. Therefore, by forming the first black stripe 25 by laminating the black layer 25c and the white layer 25d, the vertical partition wall 34a comes into contact mainly at the position of the first black stripe 25.

  If it is assumed that the first black stripe 25 is formed of only the black layer 25c, the vertical partition wall 34a comes into contact with the protective layer 28 at the positions of the bus electrodes 22b and 23b. If the defect of the partition wall 34 occurs at this position, the fragments of the partition wall 34 are scattered inside the corresponding discharge cell and the phosphor layer 35 is peeled off and the phosphor is dropped, so that the discharge cell does not operate normally and does not emit light. .

  However, in the present embodiment, since the first black stripe 25 is formed by laminating the black layer 25c and the white layer 25d, the vertical partition wall 34a is connected to the protective layer 28 at the position of the first black stripe 25. It will abut. This position is an intersection of the vertical partition wall 34a and the horizontal partition wall 34b, and is a position where the partition wall 34 is not easily damaged. In addition, since this position is a gap between two discharge cells adjacent in the vertical direction, even if a defect in the partition wall 34 occurs at this position, the possibility that fragments of the partition wall 34 are scattered inside the discharge cell is low. In addition, since the possibility of the phosphor falling inside the discharge cell is low, the possibility that the discharge cell does not operate normally is low.

  In addition, since a conductive material containing Ag is used for the white layer, if the white layer is inadvertently provided, it functions as a floating electrode and may hinder the normal operation of the discharge cell. However, in this embodiment, two scanning electrodes 22 and two sustain electrodes 23 are alternately arranged, and the white layer is formed only on the first black stripe 25 formed between the sustain electrodes 23 to which the same drive voltage is applied. A white layer is not formed on the second black stripe 26 provided between the scanning electrodes 22 to which 25d is formed and different drive voltages are applied. Therefore, the first black stripe 25 formed by laminating the black layer 25c and the white layer 25d does not possibly disturb the normal operation of the discharge cell. The vertical barrier ribs 34a and the protective layer 28 are not in contact with each other at the position of the second black stripe 26, but the vertical barrier ribs 34a and the protective layer 28 are in contact with each other at the position of the first black stripe 25. The possibility of contact at the position 23b does not increase.

  In the present embodiment, the first black stripe 25 has been described as having a structure in which a stripe-like white layer 25d is stacked on a stripe-like black layer 25c. However, the white layer 25d is provided to secure the thickness of the first black stripe 25 and to bring the protective layer 28 and the vertical barrier rib 34a into contact with each other between adjacent discharge cells. Therefore, the white layer 25d is not necessarily formed in a stripe shape, and may have a structure in which, for example, a rectangular white layer is laminated on the stripe-shaped black layer 25c at a position facing the vertical partition wall 34a. That is, a structure in which a white layer is formed in an island shape on the striped black layer 25c may be used.

  It should be noted that the specific numerical values used in the present embodiment are merely examples, and it is desirable to appropriately set the optimal values according to the panel characteristics and specifications.

  The present invention is useful as a panel while suppressing defects in the barrier ribs and causing no malfunction of the discharge cells even when the barrier ribs are defective.

The disassembled perspective view which shows the structure of the panel in embodiment of this invention Arrangement of each electrode and black stripe on the panel The figure which shows the manufacturing method of the front substrate of the panel The figure which shows the manufacturing method of the back substrate of the panel Cross section of the panel

Explanation of symbols

10 panel 21 front substrate 22 scanning electrode 22a, 23a transparent electrode 22b, 23b bus electrode 22c, 23c, 25c, 26c black layer 22d, 23d, 25d white layer 23 sustain electrode 24 display electrode pair 25 first black stripe 26 second Black stripes 27 Dielectric layer 28 Protective layer 31 Rear substrate 32 Data electrode 33 Dielectric layer 34 Partition 34a Vertical partition 34b Horizontal partition 35 Phosphor layer

Claims (3)

A front substrate having a scan electrode, a sustain electrode, and a black stripe, and a rear substrate having a data electrode and a barrier rib are arranged so as to face each other so that the scan electrode, the sustain electrode, and the data electrode are three-dimensionally crossed. A plasma display panel,
The scan electrodes and the sustain electrodes are alternately formed by two,
The black stripe includes a first black stripe formed between adjacent sustain electrodes and a second black stripe formed between adjacent scan electrodes, and the partition includes the data A vertical barrier rib formed in parallel with the electrode, and a horizontal barrier rib formed to have a height lower than the vertical barrier rib and intersect the vertical barrier rib,
The vertical barrier rib and the front substrate abut at the position of the first black stripe,
The first black stripe is formed of a black layer and a white layer,
The plasma display panel, wherein the second black stripe is formed of a black layer. The plasma display panel according to claim 1, wherein the first black stripe has a structure in which a stripe-like white layer is laminated on a stripe-like black layer. 2. The plasma display panel according to claim 1, wherein the first black stripe has a structure in which a white layer is stacked in an island shape at a position facing the vertical barrier ribs on a striped black layer.

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