JP4742799B2 - Plasma display panel - Google Patents

Description

  The present invention relates to a plasma display panel.

  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 electrodes made up of a pair of scan electrodes and sustain electrodes covered with a dielectric layer and a protective layer are arranged in parallel. On the back substrate, a plurality of data electrodes covered with a dielectric layer are arranged in parallel to each other in a direction perpendicular to the display electrodes. A partition for forming a discharge space is provided between the data electrodes. A phosphor layer is formed from the dielectric layer to the side walls of the barrier ribs. In the discharge cell, for example, xenon is enclosed as a gas that emits ultraviolet rays by discharge. And a fluorescent substance layer is excited by the ultraviolet-ray which generate | occur | produces by the discharge in a discharge cell, a visible light is generated, and an image | video is displayed.

  In order to drive the panel, a method of dividing one field period into a plurality of subfields is used. Each subfield includes an initialization period, a writing period, and a sustain period. In the initializing period, initializing discharge of the discharge cells is performed, and wall charges necessary for the subsequent writing period are formed. In the write period, a write pulse is applied to the scan electrode and the data electrode to selectively form wall charges in the discharge cells to be discharged. Subsequently, in the sustain period, a sustain pulse is applied between the scan electrode and the sustain electrode to discharge the discharge cell to emit light.

  The display electrode is composed of a bus line and a transparent electrode. After forming the transparent electrode, the bus line is formed by applying a paste containing a conductive material such as Ag and an organic material, glass and the like, and firing it. Since the organic material is burned off in the baking process, the volume of the bus line shrinks. Since this shrinkage gradually occurs from the paste surface, the surface area on the discharge cell side is smaller than the surface area on the bonding surface side of the bus line, and stress that warps from the bonding surface acts on the bus line. Therefore, the end of the bus line is easily peeled off from the transparent electrode.

  In particular, in a high definition panel, the number of display electrodes is increased, so that the display electrodes are thinned. In a large panel, the panel is enlarged, so that the display electrodes are lengthened. Along with this, the adhesive force between the bus line and the transparent electrode is weak and the stress is increased, so that peeling at the end of the display electrode is likely to occur in the panel manufacturing process.

In order to solve such problems, a configuration is disclosed in which the bus line is extended beyond the end of the transparent electrode, and the bus line is directly bonded to the front substrate of the panel to prevent peeling (for example, a patent) Reference 1).
Japanese Patent No. 3431596

  However, in the conventional panel, the bus line having high conductivity is extended from the end portion of the display electrode with a narrow width and is terminated. At the tip of a thin metal object, an electric field concentration occurs where the electric field becomes stronger when a voltage is applied. This electric field concentration easily causes discharge breakdown. For this reason, there has been a problem that erroneous discharge is likely to occur due to electric field concentration near the end of the bus line.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a panel that does not cause a bus line peeling without causing an erroneous discharge at an end portion of a display electrode.

In order to solve the above problems, the panel of the present invention has a front plate on which a display electrode is formed and a back plate arranged to face each other, and the display electrode has a laminated structure in which the transparent electrode and at least a part of the transparent electrode are laminated. The bus line has a terminal portion, a power supply end, a central portion, and a termination, and the power supply end and the termination in a region not used for displaying an image are the bus line and the transparent The bus line width at the power feeding end and the terminal end in a region that is a laminated structure with an electrode and is not used for image display is wider than the width of the bus line at the central portion . With this configuration, it is possible to provide a panel that does not cause the bus line to peel off without erroneous discharge at the end of the display electrode.

  According to the present invention, it is possible to provide a panel in which peeling of the bus line does not occur without erroneous discharge at the end portion of the display electrode.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is an exploded perspective view of panel 1 according to Embodiment 1 of the present invention. The panel 1 is configured such that a glass front substrate 2 and a glass rear substrate 3 face each other.

  On the front substrate 2, a plurality of display electrodes including a pair of scan electrodes 32 and sustain electrodes 42 are arranged in parallel to each other. The scanning electrode 32 includes a transparent electrode 30 made of ITO (Indium Tin Oxide) or the like that transmits visible light, and a bus line 31 having good conductivity including Ag or the like for reducing the resistance value of the electrode. Similarly, the sustain electrode 42 includes a transparent electrode 40 and a bus line 41. The display electrode is covered with a dielectric layer 6. Further, a protective layer 7 is formed so as to cover the dielectric layer 6.

  On the back substrate 3, a plurality of data electrodes 11 covered with the second dielectric layer 10 are arranged in parallel to each other in a direction orthogonal to the display electrodes. The barrier ribs 8 are provided between the data electrodes 11 to partition the discharge space and form discharge cells. Further, a phosphor layer 9 is formed from the second dielectric layer 10 to the side surface of the partition wall 8.

  FIG. 2 is an electrode configuration diagram of panel 1 in accordance with the first exemplary embodiment of the present invention. This figure shows an electrode configuration viewed toward the display surface of the panel 1 on which an image or the like is displayed. Hereinafter, the arrangement of the display electrodes on the panel 1 will be described. N scanning electrodes 32 and n sustaining electrodes 42 are arranged in the row direction, and m data electrodes 11 are arranged in the column direction. A discharge cell is formed at a portion where the display electrode composed of a pair of scan electrode 32 and sustain electrode 42 and one data electrode 11 intersect, and m × n discharge cells are formed in the discharge space. .

  On the right side of the panel 1, the scanning electrode terminal portion 12 is drawn from the scanning electrode 32 to the peripheral portion of the panel 1. A drive voltage is applied to the scan electrode 32 through the scan electrode terminal portion 12. Hereinafter, the end portion of the scan electrode 32 on the scan electrode terminal portion 12 side is referred to as a power feed end 62 of the scan electrode 32. On the other hand, the end of the scan electrode 32 on the left side of the panel 1 is referred to as the end 63 of the scan electrode 32.

  Similarly, on the left side of the panel 1, the sustain electrode terminal portion 13 is drawn from the sustain electrode 42 to the peripheral portion of the panel 1. A drive voltage is applied to the sustain electrode 42 via the sustain electrode terminal portion 13. The end of the sustain electrode 42 on the sustain electrode terminal portion 13 side is referred to as a power feed end 60 of the sustain electrode 42. Further, the end portion of the sustain electrode 42 on the right side of the panel 1 is referred to as a terminal end 61 of the sustain electrode 42. A data electrode terminal portion 14 is drawn from the data electrode 11 to the peripheral portion of the panel 1 at the top of the panel 1. A drive voltage is applied to the data electrode 11 through the data electrode terminal portion 14.

  FIG. 3 is an enlarged view of the end portion of the display electrode of panel 1 in accordance with the first exemplary embodiment of the present invention. The configuration of the end portion of the display electrode will be described in detail. This figure shows the display electrode as viewed from the back side of the panel 1, and the display electrode in FIG. In FIG. 3, the end portions of the sustain electrode 42 and the scan electrode 32 are shown enlarged.

  The feeding end 60 is formed by the transparent electrode 40. The bus line 41 is drawn beyond the power supply end 60 and is connected to the storage electrode terminal portion 13. On the other hand, the end 61 is formed by the transparent electrode 40. The bus line 41 has a wide portion 28 whose width is widened at the terminal end 61.

  Similarly, the feeding end 62 is formed by the transparent electrode 30. The bus line 31 is drawn beyond the power supply end 62 and is connected to the scan electrode terminal portion 12. On the other hand, the end 63 is formed by the transparent electrode 30. The bus line 31 has a wide portion 29 at the terminal end 63. In the present embodiment, the wide portion 29 has a width that is three or more times wider than the width of the bus line 31 in the central portion of the panel 1. As described above, the scanning electrode 32 has no extension of the narrow bus line 31 at the terminal 63 and the terminal 63 is formed by the transparent electrode 30 having a width wider than that of the bus line 31. An erroneous discharge in the vicinity of the terminal end 63 of the scan electrode 32 can be suppressed.

  The wide portion 29 of the bus line 31 has a width and length that is three times or more wider than the width of the bus line 31 in the image display portion at the center of the panel 1. Therefore, the bus line 31 adheres more strongly to the transparent electrode 30 at the end than at the center. Therefore, there is an effect that the bus line 31 is hardly peeled off in the process of forming the bus line 31 such as baking. Note that the discharge cells in the vicinity of the terminal ends 61 and 63 of the panel 1 are not used for displaying an image or the like. Therefore, even if the bus line 31 is widened, the display of the image is not affected at all. The length of the wide portion 29 may be extended to a place where it is not used for display.

  Further, since the terminal end 61 of the sustain electrode 42 also has the wide portion 28, there is an effect that it is possible to obtain a panel excellent in display quality in which electrode peeling is hardly caused and erroneous discharge is hardly caused. Note that the widths and lengths of the wide portions 28 and 29 in Embodiment 1 do not have to be particularly the same.

  Although the transparent electrodes 30 and 40 are terminated at the power feeding ends 60 and 62, they may be drawn out and connected to the scanning electrode terminal portion 12 and the sustain electrode terminal portion 13.

  The wide portions 28 and 29 are formed at the terminal ends 61 and 63 of the display electrodes, but may be formed at the power feeding ends 60 and 62. In this way, it is possible to prevent electrode peeling even in the vicinity of the power feeding ends 60 and 62.

(Embodiment 2)
FIG. 4 is an enlarged view of the end portion of the display electrode of the panel 1 according to Embodiment 2 of the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The feature of the second embodiment is that the transparent electrodes 30 and 40 are provided with four circular holes 45 and 46 as openings, and the wide portions 28 and 29 via the circular holes 45 and 46. Is adhered to the front substrate 2 made of glass.

  The bus lines 31 and 41 are also bonded to the glass front substrate 2 through the four circular holes 45 and 46. Since the bus lines 31 and 41 are more strongly bonded to the front substrate 2 made of glass than the transparent electrodes 30 and 40, the bus lines 31 and 41 are bonded more strongly than the case of bonding only to the transparent electrodes 30 and 40. Four circular holes are provided in the vicinity of the four corners of the wide portions 28 and 29 where electrode peeling is likely to occur. Therefore, there is an effect that peeling of the bus lines 31 and 41 hardly occurs in the process of forming the bus lines 31 and 41 such as baking.

  In addition, although the circular holes 45 and 46 are each four, one may be sufficient since the adhesive force is enhanced.

(Embodiment 3)
FIG. 5 is an enlarged view of an end portion of the display electrode of the panel 1 according to Embodiment 3 of the present invention. In the third embodiment, the same parts as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The feature of the third embodiment is that the transparent electrodes 30 and 40 are provided with four rectangular holes 49 and 50 as openings, and at least one of them is the terminal ends 61 and 63 of the wide portions 28 and 29. That is, the wide portions 28 and 29 are bonded to the front substrate 2 made of glass through the rectangular holes 49 and 50.

  The bus lines 31 and 41 are also bonded to the front substrate 2 made of glass through the four rectangular holes 49 and 50. For this reason, it can adhere | attach stronger than the case where it adhere | attaches only on the transparent electrodes 30 and 40. FIG. Compared with the image display portion at the center of the panel 1, the bus lines 31 and 41 are strongly bonded to the glass front substrate 2 in the vicinity of the wide portions 28 and 29. Further, the four rectangular holes 49 and 50 are formed so as to include the edge portions on the terminal ends 61 and 63 side of the wide portions 28 and 29 where the electrodes are easily peeled off. Further, in the process of forming the bus lines 31 and 41 such as baking, the gas escapes through the rectangular holes 49 and 50, so that the gas is less likely to be trapped and the bus lines 31 and 41 are less likely to be peeled off.

  In addition, although the rectangular holes 49 and 50 are four, even if one, since the adhesive force is strengthened, one may be sufficient.

  Further, by connecting the wide portion 28 and the end 61 of the sustain electrode 42 with the transparent electrode 40, good conductivity can be maintained at the end 61 of the sustain electrode 42. Similarly, by connecting the wide portion 29 and the end 63 of the scan electrode 32 by the transparent electrode 30, good electrical conductivity can be maintained at the end 63 of the scan electrode 32, so that electric field concentration hardly occurs. Incorrect discharge can be suppressed.

  The opening is not limited to a circular or rectangular hole, but may be any shape such as an ellipse or a pentagon.

  The present invention can provide a panel that does not cause a bus line peeling without causing an erroneous discharge at an end portion of the display electrode, and thus is useful for a display device using the panel.

The exploded perspective view of the panel in Embodiment 1 of this invention Panel configuration diagram of panel in Embodiment 1 of the present invention The enlarged view of the edge part of the display electrode of the panel in Embodiment 1 of this invention The enlarged view of the edge part of the display electrode of the panel in Embodiment 2 of this invention The enlarged view of the edge part of the display electrode of the panel in Embodiment 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Panel 2 Front substrate 3 Back substrate 6 Dielectric layer 7 Protective layer 8 Partition 9 Phosphor layer 10 Second dielectric layer 11 Data electrode 12 Scan electrode terminal portion 13 Sustain electrode terminal portion 14 Data electrode terminal portion 28, 29 Wide Part 30, 40 Transparent electrode 31, 41 Bus line 32 Scan electrode 42 Sustain electrode 45, 46 (circular) hole 49, 50 (rectangular) hole 60 Sustain electrode feed end 61 Sustain electrode end 62 Scan electrode feed End 63 End of scan electrode

Claims (1)

The front plate on which the display electrodes are formed and the back plate are arranged to face each other.
The display electrode is composed of a transparent electrode and a bus line in which at least a part of the transparent electrode and the transparent electrode have a laminated structure
The bus line has a terminal portion, a feeding end, a central portion, and a terminal end,
The feeding end and the termination in a region not used for displaying an image are a laminated structure of the bus line and the transparent electrode,
And the bus line width at the feeding end and the terminal end in a region not used for displaying an image is wider than the width of the bus line at the central portion,
Plasma display panel.

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