JP4887734B2 - Plasma display panel - Google Patents

Description

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

  Since plasma display panels (hereinafter referred to as PDP) can achieve high definition and large screen, 65-inch class televisions have been commercialized. PDP is being applied to full-spec high-definition with more than twice the number of scanning lines as compared to the conventional NTSC system.

  A PDP basically includes a front plate and a back plate. The front plate is a display electrode composed of a sodium borosilicate glass substrate manufactured by a float process, a striped transparent electrode and a bus electrode formed on one main surface thereof, and this display The dielectric layer is configured to cover the electrodes and serve as a capacitor, and a protective layer made of magnesium oxide (MgO) formed on the dielectric layer. On the other hand, the back plate is a glass substrate, a stripe-shaped write electrode formed on one main surface, a base dielectric layer covering the write electrode, a partition formed on the base dielectric layer, It is comprised with the fluorescent substance layer which light-emits each of red, green, and blue formed between the partition walls.

  The front plate and the back plate are hermetically sealed with their electrode forming surfaces facing each other, and neon (Ne) -xenon (Xe) discharge gas is sealed at a pressure of 400 Torr to 600 Torr in a discharge space partitioned by a partition wall. ing. PDP discharges by selectively applying a video signal voltage to the display electrodes, and the ultraviolet rays generated by the discharge excite each color phosphor layer to emit red, green, and blue light, thereby realizing color image display is doing.

In a PDP having such a structure, an example of realizing a PDP with excellent shape accuracy by separating a discharge space partitioned by a partition into a display area and a non-display area (for example, Patent Document 1), or for impure gas countermeasures An example in which the outer periphery of the display area is surrounded by a second partition (for example, Patent Document 2) is disclosed.
JP 2001-160360 A JP 2005-228754 A

  As described above, the PDP has been applied to full-spec high-definition whose number of scanning lines is twice or more that of the conventional standard definition method, and miniaturization of discharge cells is required.

  As the discharge cells are miniaturized, the shape accuracy is increasingly required to be high, and the discharge cells are required to have a configuration in which abnormal discharge phenomenon such as crosstalk between adjacent discharge cells does not occur. Compared to the standard definition, there is a problem that a crosstalk phenomenon is likely to occur due to a slight gap between the top of the partition wall and the front plate in the display area, and in particular, a drive voltage at the time of writing increases.

  An object of the present invention is to solve the above-described problems and to provide a PDP that realizes high-quality image display even on a large screen and high-definition display.

In order to solve the above problems, the PDP of the present invention has a front plate on which at least a display electrode is formed on a glass substrate and a back plate on which at least a write electrode is formed on the substrate. A PDP that is sealed with a sealing material and has a long side and a short side, and has a display area and a non-display area, and the non-display area at the end portion on the short side is adjacent to the display area A first non-display area having a first partition that forms a display area, and a second non-display area having a second partition that is adjacent to the first non-display area and has a different shape from the first partition . One partition wall is a partition wall having a grid shape or a lattice shape, and the second partition wall is a partition wall having a stripe shape .

  In this way, the non-display area is constituted by the first non-display area and the second non-display area, and the partition is also provided in the second non-display area, so that the display area has a space between the front plate and the top of the partition. It is possible to suppress the generation of a gap and realize high-quality image display even on a large screen.

Further, the first partition is a partition wall having a curb shape or lattice shape, according the second partition wall in the Una by Ru bulkhead der constituting a stripe shape, improve the display performance of the display area, further, the second non By making the partition of the display area into a stripe shape, it is possible to improve the exhaust performance when exhausting the inside of the PDP and realize a higher quality image display.

  Furthermore, it is desirable to arrange the sealing material on the outer peripheral portion of the second partition wall in the second non-display area. According to such a configuration, when the front plate and the rear plate are sealed, the position of the front plate and the rear plate is more reliably regulated by the second partition provided in the second non-display area. It is possible to suppress the bending of the front plate that occurs during wearing, and to suppress the generation of a gap between the front plate and the top of the first partition in the display area.

  As described above, according to the present invention, a high-quality image display PDP can be realized even on a large screen and high-definition display.

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

(First embodiment)
FIG. 1 is a perspective view showing the structure of the PDP in the first embodiment of the present invention. The basic structure of the PDP is the same as that of a general AC surface discharge type PDP. As shown in FIG. 1, the PDP 1 has a front plate 2 made of a front glass substrate 3 and a back plate 10 made of a back glass substrate 11 facing each other, and its outer peripheral portion is sealed with a glass frit or the like. It is hermetically sealed with a dressing. A discharge gas such as neon (Ne) and xenon (Xe) is sealed at a pressure of 400 Torr to 600 Torr in the discharge space 16 inside the sealed PDP 1.

  On the front glass substrate 3 of the front plate 2, a pair of strip-shaped display electrodes 6 each composed of the scanning electrodes 4 and the sustain electrodes 5 and the light shielding layers 7 are arranged in a plurality of rows in parallel with each other. A dielectric layer 8 serving as a capacitor is formed on the front glass substrate 3 so as to cover the display electrode 6 and the light shielding layer 7, and a protective layer 9 made of magnesium oxide (MgO) is formed on the surface. Has been.

  On the back glass substrate 11 of the back plate 10, a plurality of strip-like write electrodes 12 are arranged in parallel to each other in a direction perpendicular to the scanning electrodes 4 and the sustain electrodes 5 of the front plate 2, and this is used as a base dielectric. Layer 13 is covering. Further, a partition wall 14 having a predetermined height is formed on the base dielectric layer 13 between the write electrodes 12 to divide the discharge space 16. A phosphor layer 15 that emits red, green, and blue light by ultraviolet light is sequentially applied to each of the write electrodes 12 in the groove between the barrier ribs 14. A discharge cell is formed at a position where the scan electrode 4 and the sustain electrode 5 intersect with the writing electrode 12, and the discharge cell having red, green, and blue phosphor layers 15 arranged in the direction of the display electrode 6 is used for color display. Become a pixel.

  FIG. 2 is a view showing a state in which the front plate 2 and the back plate 10 of the PDP in the first embodiment of the present invention are sealed and joined, and the front plate 2 and the back plate 10 are sealed around the periphery. A configuration in which the exhaust pipe 51 is provided on the back plate 10 by sealing with a material 50 is shown. FIG. 2A is a plan view seen from the back plate 10 side, and FIG. 2B is a cross-sectional view taken along line AA of FIG. The front plate 2 and the back plate 10 are arranged to face each other so that the display electrode 6 and the write electrode 12 are orthogonal to each other, and the periphery thereof is sealed with a sealing material 50. After the discharge space 16 is evacuated by the exhaust pipe 51, a discharge gas containing neon (Ne), xenon (Xe), etc. is sealed from the exhaust pipe 51 and the exhaust pipe 51 is sealed to complete the PDP 1. . The PDP 1 has a rectangular shape having a long side and a short side as a whole. The image of the PDP 1 is displayed in the display area B surrounded by the broken line in the entire surface of the PDP 1 as shown in FIG. A non-display area C in which an exhaust passage and the like are formed is formed on the outer periphery of the display area B and the inner peripheral portion of the sealing material 50.

  FIG. 3 is a cross-sectional view showing the configuration of the short-side end portion of the PDP in the first embodiment of the present invention, and is a cross-sectional view showing details of a D portion in FIG. In FIG. 3, unlike FIG. 2B, the back plate 10 and the front plate 2 are shown upside down. On the other hand, FIG. 6 shows a cross-sectional view showing details of the configuration of the short side end portion of a conventional standard definition PDP as a comparative example with the present invention.

  As shown in FIG. 6, at the short side end portion of the conventional standard definition PDP, dummy regions E in which several rows of the same partition walls 60 as the partition walls 60 constituting the display region B are provided in the long side direction of the PDP are provided. It is provided outside the display area B. An exhaust passage 62 is provided outside the outermost partition wall 61 of the dummy area E, and is configured so that the end of the back plate 63 and the front plate 64 are sealed with a sealing material 65. The sealing material 65 is also provided on the dielectric layer 66 provided on the front plate 64.

  On the other hand, when forming the partition wall 60 of the display region B, the dummy region E has a partition wall height at the outermost end portion of the partition wall formation region due to film thickness non-uniformity at the time of coating or heat shrinkage at the time of solidification by baking. It is provided for the purpose of preventing the influence of decreasing from reaching the display area B. In the PDP having such a structure, when the front plate 64 and the back plate 63 are sealed and joined with the sealing material 65 applied to the outer peripheral portion thereof, the sealing material 65 is held while holding the outer peripheral portion with clips or the like. A method of melting and then bonding and solidifying is used. Therefore, when the sealing material 65 melts, the distance between the front plate 64 and the back plate 63 becomes smaller on the outer side and larger on the inner side as shown in FIG. 6 with the top of the outermost partition wall 61 as a fulcrum. As a result, in the display area B, a gap 67 is generated between the front plate 64 and the top of the partition wall 60, and a discharge crosstalk phenomenon occurs between adjacent discharge cells. As a result, there arises a problem that the writing voltage when writing to a specific discharge cell is increased, resulting in poor image display quality.

  In recent years, an increase in the screen size of a PDP having a diagonal size of 50 inches or more in the image display area and a high-definition to a full-spec high-definition with more than twice the number of scanning lines compared to the standard definition method has been progressing. . In such a PDP, since the discharge cell itself is fine, it is easily affected by a slight gap between the front plate and the back plate, causing variations in image display and an increase in discharge voltage. For example, in the case of a large screen with a diagonal size of 65 inches or more, a slight change in the size of the edge becomes a large change in the center, resulting in an increase in writing voltage and non-uniformity in image display. To help.

  As shown in FIG. 3, in the PDP according to the first embodiment of the present invention, the partition 14, which is the first partition for forming the display region F, is formed adjacent to the display region F serving as the display region space. A dummy area G to be a first non-display area is formed. In addition, a dummy region H that is adjacent to the dummy region G and has a partition 20 that is a second partition having a different shape from the partition 14 is provided as a second non-display region. Further, a sealing material 50 is provided on the outer peripheral portion of the partition wall 21 constituting the outermost part of the dummy region H so as to seal the front plate 2 and the back plate 10. The sealing material 50 is also provided on the dielectric layer 8 provided on the front plate 2.

  FIG. 4 is a plan view showing details of a partition wall provided on the back plate 10 of the PDP in the first exemplary embodiment of the present invention. As shown in FIG. 4, the shape of the partition wall 14 in the display region F and the dummy region G is a cross-girder shape or a lattice shape including the vertical ribs 22 and the horizontal ribs 23, and the partition wall 20 in the dummy region H is the vertical ribs of the partition wall 14. 22 is a stripe shape parallel to 22. By making the shape of the barrier ribs 14 in the display area F a cross-beam shape, high-efficiency discharge in each discharge cell can be realized. On the other hand, when forming the partition wall 14 of the display region F, the dummy region G has a partition wall height at the outermost end portion of the partition wall formation region due to film thickness non-uniformity at the time of coating or heat shrinkage at the time of solidification by baking. It is provided for the purpose of preventing the influence of decreasing from reaching the display area F. In particular, when the partition wall shape is a cross-girder shape or a lattice shape, the vertical rib 24 at the outermost end is easily affected by the thermal contraction of the horizontal rib 25, so that the height of the partition wall 14 is likely to be small.

  In the first embodiment of the present invention, as shown in FIG. 3, a stripe-shaped partition wall 20 is provided adjacent to the dummy region G, and sealed to the outer peripheral portion of the partition wall 21 constituting the outermost part of the dummy region H. A material 50 is provided to seal the front plate 2 and the back plate 10. Since the partition walls 20 and 21 in the dummy region H have a simple stripe shape, the height accuracy can be ensured without being affected by thermal contraction as compared to the case of a grid-shaped or lattice-shaped partition wall. Therefore, when the front plate 2 and the back plate 10 are arranged to face each other and sealed, the partition walls 20 and 21 in the dummy region H serve as spacers. For this reason, even when the shape accuracy of the partition 14 in the dummy region G cannot be ensured, the gap between the front plate 2 and the back plate 10 can be uniformly sealed. As a result, the occurrence of a gap between the front plate 2 and the top of the partition wall 14 is suppressed, crosstalk between adjacent discharge cells is suppressed, and an increase in discharge voltage such as a write voltage is suppressed. Uniform discharge and image display can be realized.

  2, the outer peripheral portion of the display area forms an exhaust passage to the exhaust pipe 51, as shown in the figure showing a state where the front plate 2 and the rear plate 10 are sealed and joined. According to the first embodiment of the present invention, the dummy region H forms the exhaust passage, and the exhaust passage is the stripe-shaped partition wall 20. Therefore, the exhaust resistance can be reduced to sufficiently exhaust the inside of the PDP, and discharge nonuniformity and discharge voltage increase due to impure gas can be suppressed.

  In FIG. 3, the sealing material 50 is provided outside the outermost partition wall 21 in the dummy region H. However, the sealing material 50 may be inserted between the partition walls 20 in the dummy region H.

(Second Embodiment)
FIG. 5 is a cross-sectional view showing the configuration of the short side end of the PDP in the second embodiment of the present invention.

  Since the basic configuration of the PDP in the second embodiment of the present invention is the same as that of the PDP in the first embodiment, detailed description thereof is omitted. The present embodiment is different from the first embodiment in that a space portion 26 is provided adjacent to the dummy region H and between the sealing material 50 as shown in FIG. That is, in the first embodiment, the exhaust passage is formed by the plurality of stripe-shaped partition walls 20 provided in the entire dummy region G. However, in this embodiment, the number of stripe-shaped partition walls in the dummy region H is reduced. A space portion 26 is provided adjacent to the partition wall 20.

  According to such a configuration, the space portion 26 adjacent to the dummy region H can be used as an exhaust passage, and the stripe-shaped partition wall 20 can be used as a spacer between the front plate 2 and the back plate 10. Therefore, the gap between the front plate 2 and the rear plate 10 is sealed uniformly, and no gap is generated between the front plate 2 and the top of the partition wall 14 in the display area F. Furthermore, since the exhaust passage is formed by the space portion 26, it is possible to further reduce the exhaust resistance and suppress the impure gas from remaining in the PDP, thereby realizing a higher quality image display.

  In the above-described embodiment, the partition wall 20 provided in the dummy region H has a complete stripe shape. However, for example, a notch shape is provided in the longitudinal direction of the stripe and the partition wall is formed in an island shape. It is good also as a structure which makes it the shape provided and accelerates | stimulates exhaust of the impure gas from a display area in the case of exhaust.

  As described above, the PDP of the present invention realizes a high-quality image display PDP even on a large screen and is useful for a large-screen display device.

The perspective view which shows the structure of PDP in the 1st Embodiment of this invention The figure which shows the state which carried out sealing joining of the front plate and back plate of the PDP Sectional drawing which shows the structure of the short side edge part of the PDP The top view which shows the detail of the partition provided in the back plate of the PDP Sectional drawing which shows the structure of the short side edge part of PDP in the 2nd Embodiment of this invention. Sectional drawing which shows the detail of the structure of the short side edge part in the conventional standard definition PDP

Explanation of symbols

1 PDP
DESCRIPTION OF SYMBOLS 2 Front plate 3 Front glass substrate 4 Scan electrode 5 Sustain electrode 6 Display electrode 7 Light shielding layer 8 Dielectric layer 9 Protective layer 10 Back plate 11 Back glass substrate 12 Writing electrode 13 Base dielectric layer 14, 20, 21 Partition 15 Phosphor Layer 16 Discharge space 22, 24 Vertical rib 23, 25 Horizontal rib 26 Space 50 Sealing material 51 Exhaust pipe

Claims (2)

A front plate on which at least display electrodes are formed on a glass substrate and a back plate on which at least write electrodes are formed on the substrate are arranged to face each other, and the periphery is sealed with a sealing material, and has a long side and a short side. A plasma display panel having a rectangular shape and formed with a display area and a non-display area, wherein the non-display area at the short side end forms the display area adjacent to the display area And a second non-display area having a second partition that is adjacent to the first non-display area and has a shape different from that of the first partition, the first partition having a grid shape or a lattice. A plasma display panel , wherein the partition wall has a shape, and the second partition wall is a partition wall having a stripe shape . The plasma display panel according to claim 1, wherein the sealing material is disposed on an outer peripheral portion of the second partition wall in the second non-display area.

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