JP4352994B2 - Plasma display panel and manufacturing method thereof, and rear substrate for plasma display panel - Google Patents

Description

  The present invention relates to a plasma display panel used for a display device and the like, and more particularly to a plasma display panel having a partition structure that prevents crosstalk and erroneous discharge.

  Compared to a liquid crystal panel, high-speed display is possible and it is easy to increase the size. Therefore, a plasma display panel (hereinafter referred to as PDP) that displays an image by exciting phosphors with ultraviolet light by rare gas discharge to emit light is displayed. Expectations are rising. In addition, the PDP has been attracting attention as a large-screen display device for high-definition, and for this reason, development aimed at improving display quality such as high definition and high brightness and high reliability has become increasingly important.

  Generally, an AC drive surface discharge type PDP employs a three-electrode structure, and basically has a configuration in which two glass substrates, a front substrate and a rear substrate, are arranged to face each other at a predetermined interval. The front substrate is a glass substrate, a striped transparent electrode formed on one main surface of the glass substrate, a display electrode made of a metal bus, and a dielectric that acts as a capacitor that covers the display electrode and accumulates charges. And a MgO protective layer formed on the dielectric layer.

  On the other hand, the back substrate is a glass substrate, a striped data electrode formed on one main surface of the glass substrate, a dielectric layer covering the data electrode, and a display cell forming a discharge space formed thereon. And a phosphor layer that emits red, green, and blue light respectively applied in the discharge cell formed by each partition.

  The front substrate and the rear substrate are hermetically sealed with the electrode forming surfaces facing each other so that the display electrode and the data electrode intersect, and a discharge gas such as Ne-Xe is 400 Torr to 600 Torr in the discharge space. It is sealed with a pressure of. A discharge is generated by selectively applying a video signal voltage to the display electrodes, and the generated ultraviolet light excites each color phosphor to emit red, green, and blue colors, thereby displaying a color image. Yes.

  In recent years, the discharge cells have become finer with higher definition of PDP, and it has become an important issue to suppress erroneous discharge and crosstalk between adjacent discharge cells.

In response to such a demand, for example, an example in which the partition has a cross-girder structure composed of a main partition and an auxiliary partition and an example in which crosstalk is prevented by an electrode configuration have been proposed (for example, Patent Document 1 and Patent Document 2). Such).
JP 2002-587779 A JP-A-11-65515

  However, it is difficult to completely shield each discharge cell due to a manufacturing error, material distortion, and the like, in the method of physically partitioning with a partition and shielding between adjacent discharge cells. Further, when the barrier rib has a cross-girder structure, exhaust resistance becomes large when exhausting the discharge space, so that exhaust becomes insufficient, and there is a problem that display quality is deteriorated such as erroneous discharge due to impure gas. Further, in the case of the electrode configuration, there is a problem that the discharge region is narrowed and the luminance is lowered.

  An object of the present invention is to solve the above-described conventional problems and to realize a PDP having excellent image quality even when the definition is increased.

In view of the above problems, PDP of the present invention is a PDP in which the display electrodes and data electrodes and a rear substrate having a front substrate and a data electrode and the partition wall having a display electrode was opposed to cross the partition wall Are formed of a horizontal partition and a vertical partition, and a recess is provided at the top of the partition, and the depth of the recess at the intersection of the horizontal partition and the vertical partition It is larger than the depth of the recess, and a conductor is disposed in the recess.

With this configuration, it is possible to limit the plasma particles that diffuse from the discharge cell to the adjacent discharge cell by causing the conductor provided on the top of the partition wall to act as an electrode and applying a voltage of a predetermined potential to the electrode. In addition, it is possible to provide a PDP capable of high brightness and high definition that suppresses false discharge and crosstalk , and the conductor is exposed to the discharge cell at the crossing position and affects the discharge plasma in the discharge cell. There is no.

  Furthermore, it is desirable that the depth of the recess is 1/3 or more of the barrier rib height and less than the barrier rib height. According to such a configuration, the discharge region of the discharge plasma in the discharge cell is controlled, The luminous efficiency of the body can be improved.

The PDP rear substrate of the present invention is a PDP rear substrate that includes data electrodes and partition walls, and is disposed so that the display electrodes and data electrodes provided on the front substrate intersect with each other. It is composed of a partition wall and a vertical partition wall, and a recess is provided at the top of the partition wall. The conductor is disposed in the concave portion.

With this configuration, it is possible to limit the plasma particles that diffuse from the discharge cell to the adjacent discharge cell by applying a voltage of a predetermined potential to the electrode provided on the top of the partition wall as an electrode. It is possible to provide a PDP rear substrate capable of high brightness and high definition with suppressed discharge and crosstalk , and the conductor is exposed in the discharge cell at the crossing position and affects the discharge plasma in the discharge cell. There is nothing.

  Furthermore, it is desirable that the depth of the recess is 1/3 or more of the barrier rib height and less than the barrier rib height. According to such a configuration, the discharge region of the discharge plasma in the discharge cell is controlled, The luminous efficiency of the body can be improved.

  As described above, according to the present invention, it is possible to realize a high-quality PDP suitable for high luminance and high definition that prevents erroneous discharge and crosstalk.

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

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view showing the structure of the PDP in the first embodiment of the present invention.

  As shown in FIG. 1, in the PDP according to the first embodiment of the present invention, a front substrate 101 made of a front glass substrate 1 and the like and a rear substrate 102 made of a rear glass substrate 2 and the like are arranged to face each other. The outer periphery is hermetically sealed with a sealing material made of glass frit or the like. In the sealed discharge space 12 of the PDP, neon (Ne), xenon (Xe), and the like are sealed as discharge gases at a pressure of 400 Torr (53.2 kPa) to 600 Torr (79.8 kPa).

  On the front glass substrate 1 of the front substrate 101, a plurality of a pair of strip-shaped display electrodes 34 composed of the scan electrodes 3 and the sustain electrodes 4 are arranged so as to be parallel to each other. Scan electrode 3 and sustain electrode 4 are each composed of a transparent electrode and a metal bus bar formed on the transparent electrode and made of silver or the like for enhancing conductivity. Further, a light absorption layer 5 made of a black material is provided between the pair of scan electrodes 3 and the sustain electrodes 4. A dielectric layer 6 made of Pb—B glass or the like and serving as a capacitor is formed on the front glass substrate 1 so as to cover the scan electrodes 3 and the sustain electrodes 4, and magnesium oxide (MgO) is further formed thereon. ) Or the like is formed.

  On the back glass substrate 2 of the back substrate 102, a plurality of strip-like data electrodes 9 are arranged in parallel to each other in a direction perpendicular to the display electrodes 34, and this is covered with the dielectric layer 8. Yes. Further, the barrier ribs 10 for partitioning a plurality of discharge cells formed by the display electrodes 34 and the data electrodes 9 are formed in stripes in parallel with the data electrodes 9. A phosphor layer 11 is formed in each discharge space 12 that is partitioned by the barrier ribs 10 and constitutes a discharge cell. The phosphor layers 11 are alternately formed with phosphor layers 11 (R), 11 (G), and 11 (B) that emit red, green, and blue light by ultraviolet rays, corresponding to the data electrodes 9.

As the phosphor material, (Y, Gd) BO ₃ : Eu or Y ₂ O ₃ : Eu is used as the phosphor of the red phosphor layer, Zn ₂ SiO ₄ : Mn is used as the green phosphor, and blue phosphor is used. For example, BaMgAl ₁₀ O ₁₇ : Eu is used.

  Next, the details of the structure of the back substrate 102 will be described with reference to FIGS.

  FIG. 2 is a partial cross-sectional view of the PDP according to the first embodiment of the present invention as viewed from the direction A in FIG. In the first embodiment of the present invention, as shown in FIG. 2, a conductor 13 is formed on the top of the partition 10 facing the front substrate 101. Moreover, the conductor 13 is arrange | positioned at the groove-shaped recessed part 15 provided in the top part of each partition 10, as shown in FIG. Further, the conductors 13 provided in each partition 10 are connected at places other than the display area of the PDP, and are configured to apply a predetermined voltage with all the conductors 13 having the same potential.

  As described above, according to the first embodiment of the present invention, the conductor 13 is provided on the partition wall 10 partitioning the discharge cell so that a predetermined potential can be applied to the conductor 10. Therefore, by applying a predetermined voltage to the conductor 13 during the initializing discharge, address discharge, and sustain discharge of each discharge cell, for example, during the sustain discharge, the discharge cell is shielded in terms of potential and plasma particles. It is possible to prevent so-called crosstalk that leaks to adjacent cells. In addition, it is possible to replenish the charge formed at the time of address discharge or initialization discharge, thereby realizing optimum initialization discharge or address discharge.

  FIG. 4 shows an example of the shape of the conductor 13 provided on the partition wall 10. As shown in FIG. 4, a semicircular, triangular, or rectangular recess 15 is formed at the top of the partition wall 10, and the conductor 13 is disposed in the recess 15. As shown in FIG. 3, the conductor 13 may be a method of embedding a wire, for example, a thin metal wire in the concave portion 15, but in this embodiment, a paste containing conductive metal particles and a resin component is dispensed. It is formed by filling the recess 15 while being discharged from the substrate, and then drying and baking the paste.

  As a method of forming the groove-shaped recess 15, it is possible to produce the partition wall 10 by applying the photosensitive paste a plurality of times, exposing, and developing, and using a groove pattern when forming the uppermost layer. is there. The conductor 13 is disposed in the recess 15 formed on the top of the partition wall 10 when the conductor 13 is formed on the top surface of the partition wall 10 and the conductor 13 exposed into the discharge cell is sputtered by the discharge plasma. This is to suppress the influence of impure gas generated and the influence on discharge. In particular, if the state of exposure of the conductor 13 to the discharge cell differs for each discharge cell, the influence of the potential applied to the conductor 13 for each discharge cell on the respective discharge plasmas is different, and uniform discharge is inhibited. become.

  According to the first embodiment of the present invention, the conductor 13 is formed in the recess 15 by using a paste application method using a dispenser. In the dispenser coating method, the paste is discharged from a fine discharge nozzle, and the nozzle is scanned along the recess 15 provided in the partition wall 10 to fill the recess 15 with the optimum amount of paste. 13 can be formed without exposure to the discharge cell side.

  As a result, the voltage applied to the display electrode 34 and the data electrode 9 has a function of electrically shielding the diffusion of the plasma discharge to the adjacent cells by applying an appropriate potential to the conductor 13 in a timely manner. Can be added. Therefore, crosstalk between adjacent discharge cells can be suppressed, and a quality margin can be increased for higher definition. Further, compared with the conventional barrier rib structure, the electric field strength can be locally increased in the discharge cell, plasma discharge can be easily generated, and the address speed can be increased. Further, the plasma discharge can be concentrated at the center of the discharge cell, and particles generated by the plasma discharge can be prevented from adhering to the surfaces of the phosphor layer 11 and the partition wall 10 and being chemically bonded. Therefore, the luminous efficiency of the phosphor layer 11 can be increased and the deterioration of the phosphor layer 11 over time can be suppressed. Further, since there is no influence from adjacent discharge cells, wall charges in the discharge cells can be surely erased, and a high-contrast PDP with no afterglow can be realized.

  In addition, as shown in FIG. 5, the groove-shaped recess 15 is deepened to apply a potential to the conductor 13, thereby controlling the discharge plasma generation region B in the discharge cell, and the phosphor layer 11 and the discharge plasma. , And the luminous efficiency of the phosphor can be improved. According to the present embodiment, when the depth of the recess 15 is set to 1/3 or more of the height of the partition wall 10, the luminous efficiency is improved.

  As described above, according to the first embodiment of the present invention, the plasma discharge in the discharge cell is diffused to the adjacent discharge cell by forming the conductor 13 on the top of the partition wall 10 partitioning the discharge cell. This can be electrically shielded at the partition wall. Therefore, in combination with the physical shielding effect of the partition wall 10, it is possible to provide a PDP that is particularly suitable for high definition, in which erroneous discharge and crosstalk are effectively suppressed.

(Second Embodiment)
Hereinafter, the PDP according to the second embodiment of the present invention will be described with reference to FIGS. In the PDP in the second embodiment, the configuration of the front substrate 101 is the same as that in the first embodiment, and the configuration of the back substrate 102 is different.

  FIG. 6 is a perspective view showing the structure of the back substrate 102 of the PDP in the second embodiment of the present invention. FIG. 7A is a plan view showing the structure of the partition wall 10, and FIG. 7B is a sectional view taken along the line DD in FIG. 7A. As shown in FIGS. 6 and 7, the barrier rib 10 has a cross beam structure including a plurality of horizontal barrier ribs 10 a formed parallel to the display electrodes 34 and a plurality of vertical barrier ribs 10 b formed parallel to the data electrodes 9. is doing. In addition, a horizontal groove portion 15a and a vertical groove portion 15b are provided at the tops of the horizontal barrier rib 10a and the vertical barrier rib 10b, respectively, and a horizontal conductor 13a and a vertical conductor 13b are embedded in the horizontal groove portion 15a and the vertical groove portion 15b, respectively. It is formed with.

  Further, as shown in FIG. 7B, at the intersection 15c where the horizontal partition 10a and the vertical partition 10b intersect, the recess 15 is formed deeper than the horizontal groove 15a and the vertical groove 15b that do not intersect with the partition 10. The vertical conductor 13b is formed so as to cross over the horizontal conductor 13a.

  A PDP having a grid-shaped partition wall is particularly suitable as a PDP for high-definition images, but has a problem in further high definition or countermeasures against impure gas. That is, since each discharge cell is independently partitioned by the cross-beam structure, it is not easily affected by adjacent cells, but on the other hand, there is a shortage of supply of appropriate plasma particles to adjacent cells, that is, supply of priming particles. It has discharge instability. Further, when exhausting the discharge space at the time of manufacture, the cross-girder structure becomes an exhaust resistance, so that complete exhaust cannot be performed, impure gas remains, and discharge is uneven.

  According to the second embodiment of the present invention, the horizontal girder structure horizontal partition wall 10a, the horizontal conductor 13a provided on the vertical partition wall 10b, and the vertical conductor 13b are the same as described in the first embodiment. By applying a predetermined voltage, it is possible to control the plasma particles and the discharge form in the discharge cell. Therefore, the optimal supply of priming particles to the adjacent cells is controlled, and for example, even if the height of the horizontal barrier ribs 13a is slightly lowered to reduce the exhaust resistance of the discharge cells, the horizontal barrier ribs provided on the horizontal barrier ribs 10a are reduced. It is also possible to optimally control the crosstalk to adjacent cells by the conductor 13a.

  Further, at the intersection 15c where the horizontal partition 10a and the vertical partition 10b intersect, the recess 15 is formed deeper than the horizontal groove 15a and the vertical groove 15b that do not intersect the partition 10. Therefore, the horizontal conductor 13a and the vertical conductor 13b can be formed in the same process, and even if the volume of the conductor is increased at the intersection 15c, it can be prevented from being exposed to the discharge cell.

  Note that even in the case of such a grid wall partition, the luminous efficiency can be improved by setting the depth of the conductor 13 to 1/3 or more of the partition wall height.

In the 42-inch HD specification PDP, the dimensions of the recess 15 are set in consideration of the width of the top of the partition wall, the length of the electrode, the resistance of the electrode, the material properties of the conductive paste, and the like. The depth of the longitudinal groove 15b is preferably ¹ μm to 60 μm and the cross-sectional area is preferably 50 μm ² to 1200 μm ² , and the depth and cross-sectional area of the intersecting part 15c are ² μm to 120 μm and 100 μm ^{2 to} 2400 μm ² , respectively. It was suitable.

  As described above, according to the second embodiment of the present invention, the conductor 13 can be formed on the top of the partition wall 10 even in a PDP having a partition wall having a cross-beam structure, and the first embodiment of the present invention. The same effect can be exhibited.

  In the above embodiment, the dispenser coating method has been described as a method for forming the conductor. However, it goes without saying that other methods such as a screen printing method are also possible. Furthermore, as a method of forming the recesses in the partition walls, the method using a photosensitive paste has been described in the above description. For example, a method of forming recesses by irradiating the top of the partition walls with a laser beam or the like, a sandblasting method, or the like. It is also possible to form.

  The PDP according to the present invention has little erroneous discharge and crosstalk, and is useful as a display device with high brightness and high definition such as a wall-mounted television or a large monitor.

The disassembled perspective view which shows the structure of PDP in the 1st Embodiment of this invention. 1 is a partial cross-sectional view as viewed from the direction A in FIG. The disassembled perspective view which shows the structure of the partition of PDP in the 1st Embodiment of this invention Sectional drawing which shows an example of the shape of the conductor provided on the partition of the PDP Sectional drawing which shows the other example of the conductor of the PDP The perspective view which shows the structure of PDP in the 2nd Embodiment of this invention. (A) Plan view showing structure of partition wall of same PDP (b) DD sectional view of FIG. 7 (a)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front glass substrate 2 Back glass substrate 3 Scan electrode 4 Sustain electrode 5 Light absorption layer 6,8 Dielectric layer 7 Protective layer 9 Data electrode 10 Partition 10a Horizontal partition 10b Vertical partition 11, 11 (R), 11 (G), 11 (B) Phosphor layer 12 Discharge space 13 Conductor 13a Horizontal conductor 13b Vertical conductor 15 Recess 15a Horizontal groove 15b Vertical groove 15c Intersection 34 Display electrode 101 Front substrate 102 Rear substrate

Claims (4)

A plasma display panel in which a front substrate having a display electrode and a rear substrate having a data electrode and a partition are arranged to face each other so that the display electrode and the data electrode intersect with each other , wherein the partition is perpendicular to each other And a vertical partition, and a recess is provided at the top of the partition, and the depth of the recess at a position where the horizontal partition and the vertical partition intersect is set at a position where the horizontal partition and the vertical partition do not intersect. A plasma display panel having a depth greater than the depth of the recess and a conductor disposed in the recess. 2. The plasma display panel according to claim 1 , wherein the depth of the recess is not less than 1/3 of the partition wall height and less than the partition wall height. A rear substrate for a plasma display panel, comprising a data electrode and a partition wall, wherein the display electrode provided on the front substrate and the data electrode are arranged to face each other , wherein the partition wall is composed of a horizontal partition wall and a vertical partition wall A recess is provided at the top of the partition, and the depth of the recess at the position where the horizontal partition and the vertical partition intersect is greater than the depth of the recess at a position where the horizontal partition and the vertical partition do not intersect. A back substrate for a plasma display panel , which is enlarged and has a conductor disposed in the recess. 4. The back substrate for a plasma display panel according to claim 3 , wherein the depth of the recess is not less than 1/3 of the partition wall height and less than the partition wall height.

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