JP2011228001A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel that stabilizes coating of phosphor and has a high exhaust conductance without reducing the rate of an image display area.SOLUTION: A front-side board 11 having plural parallel display electrodes 14, a dielectric layer 15 and a protection layer 16, and a back-side board 17 formed of a glass board having plural parallel data electrodes 18, a base dielectric layer 19, partition walls 20 and a phosphor layer 23 are disposed so as to face each other through the partition walls 20 and form a discharge space therebetween, and the peripheries thereof are sealed by a sealing material 25 to form PDP 10. The partition walls 20 have at least longitudinal partition walls 20a parallel to the data electrodes 18, and grooves 28 parallel to the longitudinal partition walls 20a are formed at the outside of one terminal end portions 20c of the longitudinal partition walls 20a on the base dielectric layer 19 or the glass board.

Description

  The present invention relates to a plasma display panel used for image display.

  A typical AC surface discharge type PDP as a plasma display panel (hereinafter abbreviated as “PDP”) is composed of a front substrate and a rear substrate, which are arranged to face each other and have their surroundings sealed together, The discharge cell is formed.

  The front substrate is formed with a plurality of display electrode pairs parallel to each other on a glass substrate, a dielectric layer is formed to cover the display electrode pairs, and a protective layer is further formed to cover the dielectric layer. Yes. On the other hand, in the rear substrate, a plurality of data electrodes parallel to each other are formed on a glass substrate, and a base dielectric layer is formed so as to cover the data electrodes. Further, a grid-like barrier rib is formed on the base dielectric layer, and a phosphor layer is formed on the surface of the base dielectric layer and the side surface of the barrier rib. The front substrate and the rear substrate are arranged to face each other so that the display electrode pair and the data electrode intersect with each other, and the periphery is sealed, and a discharge space is formed inside. A discharge gas is sealed in the internal discharge space, and a discharge cell is formed in a portion where the display electrode pair and the data electrode face each other. Ultraviolet light is generated by gas discharge in each discharge cell of the PDP having such a configuration, and phosphors of red, green, and blue colors are excited and emitted by the ultraviolet light to perform color display.

  In recent years, the increase in screen size and definition of PDP has been accelerated. As a phosphor coating process for forming a phosphor layer optimal for such a large screen and high definition, a method of coating a phosphor paste on a partition wall and a base dielectric layer with a dispenser is disclosed in Patent Document 1 and the like It has been attracting attention and is becoming mainstream. However, in such a method, in order to solve the instability of the discharge amount of the phosphor paste at the start of application, the partition wall is extended to the outside of the display screen area to provide a run-up section for applying the phosphor paste.

  On the other hand, as the screen size and resolution of the PDP increase, the exhaust conductance (ease of exhaustion) inside the PDP decreases and it becomes difficult to exhaust in the exhaust process. As a result, impure gas remains in the PDP. As a result, there is a problem that the image quality is degraded. Therefore, as a method for improving the exhaust conductance of the PDP, an example in which the width of the exhaust path outside the image display area is widened is disclosed in Patent Document 2, and the partition shape outside the image display area is made a closed structure to reduce the flow during exhaust. An example of smoothing is started in Patent Document 3.

JP 2001-329256 A Japanese Patent Laid-Open No. 2003-217457 JP 2006-73508 A

  However, in the configuration described in Patent Document 1, in order to increase the width of the exhaust path, it is necessary to narrow the display area or increase the glass substrate size accordingly, and the image display area relative to the area of the glass substrate. There is a problem that the ratio of the ratio becomes smaller. In the configuration described in Patent Document 2, the flow resistance during exhaust outside the image display area is reduced, but the width of the exhaust path itself cannot be increased, and the exhaust conductance cannot be improved. is there.

  The present invention solves the above-described problems, and enables a phosphor coating using a dispenser or the like to be performed with high accuracy, and a PDP having a high exhaust conductance without reducing the ratio of the image display area to the glass substrate. The purpose is to provide.

  In order to achieve the above object, the PDP of the present invention includes a front substrate on which a plurality of display electrode pairs, a dielectric layer, and a protective layer parallel to each other are formed, a plurality of data electrodes and a base dielectric that are parallel to each other. A PDP in which a back substrate made of a glass substrate on which a layer, a barrier rib, and a phosphor layer are formed is opposed to each other with a barrier rib interposed therebetween so as to form a discharge space therebetween, and is surrounded by a sealing material. The barrier rib includes a vertical barrier rib parallel to at least the data electrode, and a groove parallel to the vertical barrier rib is formed in the underlying dielectric layer or the glass substrate outside one end portion of the vertical barrier rib.

  According to such a configuration, it is possible to perform phosphor coating using a dispenser or the like with high accuracy, and to achieve a PDP having high exhaust conductance without reducing the ratio of the image display area to the glass substrate. Can do.

  Further, it is desirable that the depth of the groove is 150 μm or more and 200 μm or less. According to such a structure, when performing fluorescent substance application | coating using a dispenser etc., the color mixture of the fluorescent substance to an adjacent discharge cell can be suppressed.

  As described above, according to the PDP of the present invention, it is possible to stabilize the coating of the phosphor without reducing the ratio of the image display area and to realize a PDP having a high exhaust conductance.

It is a partial exploded perspective view of PDP in an embodiment of the invention. FIG. 2 is a partial cross-sectional view of the PDP as viewed from the direction of arrow A in FIG. 1. It is a disassembled perspective view of the conventional PDP.

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

(Embodiment)
FIG. 1 is a partially exploded perspective view showing the structure of a PDP in the embodiment, and FIG. 2 is a partial sectional view as seen from the direction of arrow A in FIG. As shown in FIGS. 1 and 2, the PDP 10 includes a front substrate 11 and a back substrate 17.

1 and 2, a plurality of pairs of display electrodes 14 are formed on a glass front substrate 11 in parallel with each other by a scan electrode 12 and a sustain electrode 13. Scan electrode 12 and sustain electrode 13 are formed in a pattern that repeats in the arrangement of scan electrode 12 -sustain electrode 13 -sustain electrode 13 -scan electrode 12. The scanning electrode 12 is formed on a wide transparent electrode 12a made of a conductive metal oxide such as indium tin oxide (ITO), tin oxide (SnO ₂ ), or zinc oxide (ZnO), in order to increase conductivity. A narrow bus electrode 12b containing a metal such as (Ag) is stacked. Similarly, the sustain electrode 13 is formed by laminating a narrow bus electrode 13b on a wide transparent electrode 13a. Further, a dielectric layer 15 is formed so as to cover the display electrode pair 14, and a protective layer 16 is formed so as to cover the dielectric layer 15. The dielectric layer 15 is made of bismuth oxide-based low melting glass or zinc oxide-based low melting glass having a thickness of about 40 μm. The protective layer 16 is a thin film layer made of an alkaline earth oxide mainly composed of magnesium oxide (MgO) having a film thickness of about 0.8 μm. The protective layer 16 protects the dielectric layer 15 from ion sputtering and discharge start voltage, etc. It is provided to stabilize the discharge characteristics.

On the back substrate 17 made of a glass substrate, a plurality of parallel data electrodes 18 made of a conductive material mainly composed of silver are formed, and a base dielectric layer 19 is formed so as to cover the data electrodes 18. Yes. The underlying dielectric layer 19 may be the same material as that of the dielectric layer 15, but may also be a material mixed with titanium oxide (TiO ₂ ) particles so as to function as a visible light reflecting layer. A grid-like partition wall 20 is formed on the base dielectric layer 19, and red (R), green (G), and blue (B) colors are formed on the surface of the base dielectric layer 19 and the side surfaces of the partition wall 20. A phosphor layer 23 is formed.

  The barrier ribs 20 are constituted by vertical barrier ribs 20a extending in a direction parallel to the data electrodes 18 and horizontal barrier ribs 20b orthogonal to the vertical barrier ribs 20a, and a discharge space surrounded by the vertical barrier ribs 20a and the horizontal barrier ribs 20b is a discharge cell. 24 is formed. The partition wall 20 is formed to a height of about 0.12 mm using, for example, a low-melting glass material.

The phosphor layer 23 is about 15 μm using BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, Zn ₂ SiO ₄ : Mn as a green phosphor, (Y, Gd) BO ₃ : Eu as a red phosphor, and the like. The film thickness is formed.

  The front substrate 11 and the rear substrate 17 are arranged to face each other with the partition wall 20 therebetween so that the display electrode pair 14 and the data electrode 18 intersect, and the periphery (outside of the image display area) is sealed with a sealing material 25. ing. Discharge gas containing xenon (Xe) or the like is sealed in the discharge space constituting the discharge cell 24 at a pressure of about 60 kPa. That is, the discharge cell 24 is formed at a portion where the display electrode pair 14 and the data electrode 18 intersect with each other by being partitioned into a plurality of sections by the partition 20. The phosphor layer 23 emits light in red (R), green (G), and blue (B) colors by the discharge in these discharge cells 24, thereby displaying an image.

  As shown in FIG. 1, in the PDP 10 according to the embodiment, the data electrode 18 provided on the back substrate 17 is taken out only from one end of the back substrate 17 and is taken out to the other end 17a. The terminal portion is not provided. That is, the data electrode 18 is extended only to the discharge cell 24 on the end portion 17a side.

  As shown in FIG. 1, in the PDP 10 according to the embodiment, a groove 28 is formed in the base dielectric layer 19 on the end 17a side where the data electrode 18 is not formed or the back substrate 17 of the glass substrate. The groove 28 is provided in the outer direction of the end portion 20 c of the vertical partition wall 20 a by digging the base dielectric layer 19 or the back substrate 17 in parallel with the data electrode 18 and corresponding to the data electrode 18. That is, as shown in FIGS. 1 and 2, grooves 28 are formed between the end portions 20 c of the vertical partition walls 20 a and the sealing material 25 so as to correspond to the respective data electrodes 18.

  Here, a method for forming the phosphor layer 23 of the PDP 10 will be described. Various methods have been proposed for forming the phosphor layer 23. A phosphor paste obtained by kneading a powder made of a phosphor material, a resin, a solvent, etc., is filled in and applied to each discharge cell 24 by printing, or discharged from a hole (nozzle) smaller than each discharge cell 24. There are dispenser systems that fill and apply. However, in response to the recent trend toward higher definition, it is required to cope with the reduction in size of the discharge cell 24 and to increase the productivity with an increase in the screen size. As a coating method that satisfies both, high productivity and high coating accuracy can be realized. Dispenser method has become mainstream.

  The dispenser method is a method in which the phosphor paste is extruded from the nozzle and applied to the upper surface of the underlying dielectric layer 19 and the side walls of the barrier ribs 20 while moving the nozzle linearly along the central axis of the discharge cell 24. On the other hand, in the dispenser method, the discharge amount of the phosphor paste tends to become unstable at the start of the application of the phosphor paste. Therefore, it is necessary to provide a run-up area for application in the application start area.

  FIG. 3 is a partially exploded perspective view showing a configuration of a conventional PDP provided with a run-up region for application by a dispenser method. Note that the configuration of the conventional PDP shown in FIG. 3 is different from that of the present embodiment shown in FIG. That is, as shown in FIG. 3, dummy barrier ribs 50c each having a vertical barrier rib 50a are provided outside the barrier ribs 50 formed by the vertical barrier ribs 50a and the horizontal barrier ribs 50b forming the regular discharge cells 24. Accordingly, the flow path formed by the adjacent dummy barrier ribs 50c is used as a run-up region for application in the dispenser system, and the discharge accuracy in the partition 50 region is stabilized by stabilizing the phosphor paste discharge in the run-up region. Was held with high accuracy.

  However, the region where the dummy partition wall 50c is provided forms an exhaust path 59 when the impure gas in the discharge space is exhausted from the exhaust hole 27 after the front substrate 11 and the rear substrate 17 are bonded together. . Therefore, by providing the dummy partition wall 50c, the exhaust path 59 is narrowed to reduce the exhaust conductance. Further, as the screen becomes larger and the definition becomes higher, the length of the exhaust path 59 becomes longer, so that the exhaust conductance for exhausting in the discharge space becomes smaller. Therefore, there is a problem that the impure gas in the discharge space cannot be sufficiently discharged.

  On the other hand, in the PDP 10 in the present embodiment, a groove 28 is formed in the base dielectric layer 19 on the end 17a side where the data electrode 18 is not formed or the back substrate 17 of the glass substrate. The groove 28 is provided in the outer direction of the end portion 20 c of the vertical partition wall 20 a by digging the base dielectric layer 19 or the back substrate 17 in parallel with the data electrode 18 and corresponding to the data electrode 18. That is, as shown in FIGS. 1 and 2, grooves 28 are formed between the end portions 20 c of the vertical partition walls 20 a and the sealing material 25 so as to correspond to the respective data electrodes 18.

  Therefore, when the PDP 10 is exhausted from the exhaust hole 27 through the exhaust pipe 30 in the region where the groove 28 is formed, there is no dummy partition wall 50 c serving as an exhaust resistance in the exhaust path 29. Therefore, the exhaust conductance in the exhaust path 29 can be increased.

  As shown in FIGS. 1 and 2, a groove 28 is formed in the underlying dielectric layer 19 or the back substrate 17 of the exhaust path 29. In particular, the groove 28 is formed from the end portion 20 c of the vertical partition wall 20 a to the end portion 25 a of the sealing material 25. Therefore, the region of the exhaust path 29 having a length L can be used as a run-up section when the phosphor is applied by the dispenser method, and the application of the phosphor between the adjacent vertical barrier ribs 20a can be stably performed with high accuracy. It can be carried out. Further, with such a configuration, the ratio of the image display area in the entire area of the back substrate 17 can be increased.

  In this embodiment, the length L of the groove 28 is from the terminal end 20c of the vertical partition wall 20a to the end 25a of the sealing material 25. However, by optimizing the discharge conditions in the dispenser system, it is not always necessary You don't have to make that length.

  The width W of the groove 28 is preferably equal to the distance between the adjacent vertical partition walls 20a. According to such a configuration, it is possible to suppress the phosphor paste from overflowing from the groove 28 and being mixed when the phosphor paste is applied by the dispenser method.

  Further, the phosphor paste is usually applied in a thickness of 50 μm to 150 μm between the adjacent vertical barrier ribs 20a. Therefore, it is desirable that the depth of the groove 28 be 150 μm or more and 200 μm or less. According to such a configuration, it is possible to suppress the phosphor paste from protruding from the groove 28 and reducing the height of the exhaust path 29.

  As shown in FIG. 1 and FIG. 2, when the partition wall 20 is composed of the vertical partition wall 20a and the horizontal partition wall 20b, a space in which the image display area is closed by the horizontal partition wall 20b at the end portion 20c of the vertical partition wall 20a. It can be. For this reason, even if the depth of the groove 28 is, for example, about the thickness of the underlying dielectric layer 19, the height of the exhaust path 29 is slightly reduced by the phosphor paste applied to the exhaust path 29, but the phosphor paste remains in the image display area. No color mixing occurs inside.

  As described above, according to the PDP of the present invention, it is possible to stabilize the application of the phosphor without reducing the ratio of the image display area, and to realize a large-screen, high-definition PDP having high exhaust conductance.

  The PDP of the present invention realizes a thin PDP with a large screen and is useful as a thin image display device.

10 PDP
DESCRIPTION OF SYMBOLS 11 Front substrate 12 Scan electrode 12a, 13a Transparent electrode 12b, 13b Bus electrode 13 Sustain electrode 14 Display electrode pair 15 Dielectric layer 16 Protective layer 17 Back substrate 17a, 25a End 18 Data electrode 19 Base dielectric layer 20, 50 Partition 20a, 50a Vertical barrier rib 20b, 50b Horizontal barrier rib 20c Terminator 23 Phosphor layer 24 Discharge cell 25 Sealing material 27 Exhaust hole 28 Groove 29, 59 Exhaust path 30 Exhaust pipe 50c Dummy barrier rib

Claims (2)

From a front substrate on which a plurality of parallel display electrode pairs, a dielectric layer and a protective layer are formed, and a glass substrate on which a plurality of parallel data electrodes, a base dielectric layer, barrier ribs and a phosphor layer are formed A plasma display panel having a back substrate, which is opposed to the partition wall so as to form a discharge space therebetween, and which is sealed with a sealing material, and the partition wall is at least a vertical parallel to the data electrode. A plasma display panel comprising a partition, wherein a groove parallel to the vertical partition is formed in the base dielectric layer or the glass substrate outside one end portion of the vertical partition. The plasma display panel according to claim 1, wherein a depth of the groove is 150 μm or more and 200 μm or less.

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