JP2007273324A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress noise that tends to be generated in a peripheral part of a plasma display panel, in a plasma display panel. <P>SOLUTION: This plasma display panel includes a pair of glass substrates 20 and 21 facing to each other by sandwiching barrier ribs 13 therebetween, and sealing parts 23 comprising sealing layers 22 for joining the edge parts of the glass substrates 20 and 21 to each other, and is structured such that the thickness of at least either of the glass substrates 20 and 21 is set not greater than 2 mm; and the thickness of the sealing parts 23 is set smaller than that of a display region. Thereby, noise generated in lighting by drop of outside atmospheric pressure can be suppressed. In addition, it is preferable that the thickness of the sealing parts is set smaller than the height of the barrier ribs in the display region, and the difference therebetween is set not greater than 30 μm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plasma display panel (PDP) using gas discharge luminescence, which is used for a display for displaying characters and images and a color television receiver.

  As an example of a conventional PDP, FIG. 5 shows a general schematic configuration of a surface discharge AC type PDP. The front plate 2 of the PDP 1 is formed by forming a plurality of display electrodes 6 composed of scan electrodes 4 and sustain electrodes 5 on an insulating substrate 3 made of float glass having a high strain point of about 2.8 mm, and displaying the display electrode 6. A dielectric layer 7 is formed so as to cover the electrode 6, and a protective layer 8 made of MgO is further formed on the dielectric layer 7. Scan electrode 4 and sustain electrode 5 are respectively transparent electrodes 4a and 5a serving as discharge electrodes, and bus electrodes 4b made of Cr / Cu / Cr or Ag electrically connected to the transparent electrodes 4a and 5a, 5b.

  Further, the back plate 9 is formed by forming a plurality of address electrodes 11 on an insulating substrate 10 such as glass having a thickness of about 2.8 mm, and forming a dielectric layer 12 so as to cover the address electrodes 11. Yes. A partition wall 13 is provided on the dielectric layer 12 at a position corresponding to between the address electrodes 11, and phosphor layers of red, green, and blue colors are provided between the surface of the dielectric layer 12 and the side surface of the partition wall 13. 14R, 14G, and 14B are provided.

The front plate 2 and the back plate 9 are disposed to face each other with the partition wall 13 therebetween so that the display electrodes 6 and the address electrodes 11 are orthogonal to each other and form a discharge space 15. The discharge space 15 is filled with at least one kind of rare gas among helium, neon, argon, and xenon as a discharge gas, and is partitioned by the partition wall 13, and the address electrode 11, the scan electrode 4, and the sustain electrode 5 The discharge space 15 at the intersection of the two operates as a discharge cell 16. That is, in the discharge cell 16, a discharge is generated by applying a periodic voltage to the address electrode 11 and the display electrode 6, and the phosphor layers 14R, 14G, and 14B are irradiated with ultraviolet rays resulting from the discharge and converted into visible light. By doing so, image display is performed (see, for example, Non-Patent Document 1).
Electronic journal separate volume “2001FPD Technology Taizen”, Publishing Electronic Journal, Inc. October 25, 2000, p542-p547

  The front plate 2 and the back plate 9 of the PDP 1 are joined at a sealing portion provided on the peripheral edge of the PDP 1 outside the image display area. In FIG. 6, the top view of schematic structure of the backplate 9 of PDP1 is shown. The sealing portion 18 of the PDP 1 includes a sealing layer 19 made of a sealing material such as a low-melting glass material, which is formed at a position corresponding to the peripheral edge outside the image display area 17 of at least one of the front plate 2 and the back plate 9. It has been done.

  As described above, the front plate 2 and the back plate 9 are joined to the sealing layer 19 at a location to be at least one sealing portion 18 of the front plate 2 and the back plate 9 with a sealing material such as a low-melting glass material. After forming, the front plate 2 and the back plate 9 are aligned, sandwiched between clips, fixed in a state where a pressing force is applied, and heated in this state.

  Here, in this sealing step, since the sealing material of the sealing layer 19 is once melted by heating, the pressing force resulting from the variation in the relative position of the position of the clip with the partition wall 13 at that time. As a result, the sealing layer 19 contracts from the height of the partition wall 13 as shown in FIG. 7 which is a cross-sectional view in the long side direction of the PDP 1, for example. The front plate 2 and the rear plate 9 are joined in a state where the distance between the front plate 2 and the rear plate 9 is narrower than that of the partition wall 13, and as a result, the front plate 2 and the rear plate 9 are bent and bent as a shape of the PDP 1. It may be a shape.

  When the PDP 1 has such a shape, when the AC voltage pulse is applied between the scan electrode 4, the sustain electrode 5, and the address electrode 11 when the PDP 1 is turned on, it is considered to be due to the piezoelectric effect of the dielectric layers 7 and 12. In some cases, noise is generated when the front plate 2 and the partition wall 13 collide with each other. The frequency of this noise is about 10 kHz and can be fully recognized by a person.

  Usually, the pressure of the discharge gas sealed in the PDP 1 is about 66.7 kPa (500 Torr), which is lower than the atmospheric pressure, and the pressing force acts in the direction in which the front plate 2 and the rear plate 9 are pressed across the partition wall 13. The generation of noise is suppressed, but the pressure is weak at low altitudes, such as at high altitudes, and the PDP 1 is deformed in a bulging direction, and between the front plate 2 and the back plate 9. Tends to cause gaps. As a result, noise is likely to occur. That is, the above-mentioned noise problem becomes more prominent at places where the atmospheric pressure is low.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a PDP in which noise that is likely to occur in the peripheral portion of the panel is suppressed.

  In order to solve the above problems, the present invention has a pair of glass substrates opposed to each other with a partition wall interposed therebetween, and a sealing portion composed of a sealing layer that joins the peripheral portions of the glass substrate, and at least one of the glass substrates The thickness of the sheet is 2 mm or less, and the thickness of the sealing portion is configured to be smaller than the thickness of the display region.

  Further, the distance from the central part of the sealing part to the display area is 30 mm or less, and further, the thickness of the sealing part is configured to be lower than the height of the partition wall in the display area, and the difference is set to 30 μm or less. It is characterized by that.

  In addition, the thickness of at least one of the glass substrates is 0.5 mm or more and 2 mm or less.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a panel in which the seal layer was excessively contracted, it is possible to realize a PDP capable of suppressing noise generated at the time of lighting by expanding the panel due to a decrease in external air pressure. .

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

  1 and 2 show cross-sectional views taken along the lines AA and BB of FIG. 6 in the PDP according to the embodiment of the present invention, respectively. Of the glass substrate 20 of the face plate 2 and the glass substrate 21 of the back plate 9, the thickness of at least one of the glass substrates is 2 mm or less. Moreover, in the sealing part 23 which consists of the sealing layer 22 which joins the peripheral part of the glass substrates 20 and 21, the thickness of the sealing part 23 is comprised thinner than the thickness of the display area A of a panel. In particular, the thickness of the sealing portion 23 is configured to be lower than the height of the partition wall 13 in the display area A, and the difference is set to 30 μm or less.

  In the PDP, the frame distance L from the center of the sealing portion 23 shown in FIG. 1 to the display area A is as large as possible from the substrate size to reduce the cost per inch size of the display area. From the point of view, it is desirable that the size is as small as possible. However, in the case of a plasma display panel of about 37 inches to 50 inches as a substrate supporting part in manufacturing the panel or for the purpose of manufacturing a lead-out portion of the electrode terminal, about 20 mm to 30 mm. is necessary. In the present invention, the distance L from the central portion of the sealing portion 23 to the display area A is set to 30 mm or less.

  Next, the effect by this invention is demonstrated.

  Panels with glass substrate thicknesses of 1.2 mm, 1.8 mm, and 2.8 mm were used to produce panels in which the height of the sealing portion 23 was changed, and these panels were evaluated. FIG. 3 shows a case in which the thickness of the sealing portion 23 is made thinner than the thickness of the display area A of the panel in a panel having a glass substrate thickness of 1.2 mm, 1.8 mm, and 2.8 mm. It shows how the amount of subsidence changes when the minimum altitude at which noise occurs is based on the case where there is no substrate subsidence.

  As is clear from FIG. 3, in the glass substrate having a thickness of 2.8 mm, the sinking of the peripheral portion of the panel due to the excessive shrinkage of the seal layer directly caused a reduction in the level of noise generation. When a 1.2 mm thick glass substrate was used, it was found that even when the seal layer was excessively contracted, the reduction in the level of noise generation was significantly improved compared to the 2.8 mm thickness.

  FIG. 4 shows the relationship between the thickness of the glass substrate and the amount of noise generation altitude reduction when submerged by 30 μm. From this, it was found that even when the thickness of the glass substrate sinks to 30 μm, the reduction in altitude at which noise is generated can be suppressed by setting the thickness of the glass substrate to 2 mm or less. This is because by reducing the thickness of the glass substrate, the rigidity of the substrate itself is reduced, and the distortion of the sinking can be absorbed only by the sealing region, and the display surface is restrained by the external air pressure. 1 and 2, it is considered that adhesion between the rear plate and the partition is increased, and a gap between the partition and the front plate is less likely to occur.

  In a panel in which sinking of 30 μm or more occurs, the front plate is pressed against the end of the partition due to the strain stress of the glass substrate, so that chipping may occur in the partition, or the protective layer and dielectric layer on the front plate surface Since physical damage due to distortion of the glass substrate, such as cracks, was observed, yield reduction due to chipping of the partition walls and panel reliability problems due to cracks in the front plate protective layer and dielectric did not occur In order to do so, it is preferable that the amount of subsidence be 30 μm or less.

  As described above, by using a glass substrate having a thickness of 2 mm or less, it is possible to realize a PDP without a reduction in noise generation height, and in panel manufacturing, noise due to variations in the shrinkage of the sealing portion within the panel surface. Variation in the generated altitude can be suppressed, and the manufacturing yield can be improved. In addition, when it becomes a large glass substrate having a thickness of 0.5 mm or less, it is very difficult to handle the glass substrate from the viewpoint of the strength of the glass substrate, and the manufacturing yield is reduced. And the glass substrate of 0.5 mm thickness or more is preferable.

  As described above, according to the present invention, it is a useful invention capable of realizing a PDP capable of performing favorable lighting.

Sectional drawing which shows the principal part structure of the plasma display panel by one embodiment of this invention Same sectional view Explanatory drawing for demonstrating the effect of the plasma display panel by this invention Same explanatory diagram A perspective view showing a configuration of a conventional plasma display panel Schematic showing the configuration of the back plate and the sealing part Schematic for explaining problems of conventional plasma display panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Front plate 9 Back plate 13 Bulkhead 20, 21 Glass substrate 22 Seal layer 23 Sealing part

Claims (4)

A pair of glass substrates opposed to each other with a partition wall interposed therebetween, and a sealing portion made of a sealing layer that joins the peripheral edge of the glass substrate, the thickness of at least one of the glass substrates being 2 mm or less, and sealing A plasma display panel characterized in that the thickness of the wearing portion is made thinner than the thickness of the display region. 2. The plasma display panel according to claim 1, wherein a distance from the central portion of the sealing portion to the display region is 30 mm or less. 2. The plasma display panel according to claim 1, wherein the thickness of the sealing portion is configured to be lower than the height of the partition wall in the display area, and the difference is set to 30 [mu] m or less. 2. The plasma display panel according to claim 1, wherein the thickness of at least one of the glass substrates is 0.5 mm or more and 2 mm or less.

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