JP2010186666A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel which has high quality and offers high yield. <P>SOLUTION: A partition wall 34 of a rear panel is composed of a vertical partition wall 34a disposed to be parallel with an address electrode and a horizontal partition wall 34b disposed to cross the vertical partition wall 34a. Both partition walls divide a discharge space into a discharge cell. When the height of the vertical partition wall 34a at a point of crossing the horizontal partition wall 34b is H1, the height of the same at the position of a discharge gap 50 of a display electrode 24 is H2, and the height of the same at a predetermined location between the position of the discharge gap 50 and the point of crossing the horizontal partition wall 34b is H3, the vertical partition wall 34a has a shape that satisfies H2≥H1>H3. The vertical partition wall 34a is so formed as to be in contact with or closest to a front panel 20 at the position of the discharge gap 50 of the display electrode 24. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel known as a display device.

  In recent years, expectations for large screens and wall-mounted televisions are increasing as interactive information terminals, and there are many display devices such as liquid crystal display panels, field emission displays, and electroluminescence displays. Among these display devices, a plasma display panel (hereinafter referred to as “PDP”) is a thin display device with excellent visibility because it is self-luminous, can display beautiful images, and is easy to enlarge. Development for high definition and large screen is underway.

  A PDP has a small discharge inside a front plate on which components such as a display electrode, a dielectric layer, and a protective layer made of MgO are formed, and a back plate on which components such as address electrodes, barrier ribs, and phosphor layers are formed. The cells are arranged so as to face each other and the periphery is sealed with a sealing member. A discharge gas in which neon (Ne), xenon (Xe), or the like is mixed is sealed in the discharge cell at a pressure of, for example, about 66500 Pa (about 500 Torr).

  Here, the front plate covers the display electrode, forms a dielectric layer, and covers the dielectric layer, and forms a protective layer. A thick metal electrode is used. Therefore, when the protective layer at the position of the display electrode swells and the front plate and the back plate are made to face each other, the portion of the swelled protective layer and the partition wall locally contact each other. When vibration or impact is applied to the PDP in such a state, the partition wall where the protective layer is in contact may be lost. Since the barrier ribs in the area corresponding to the display electrodes on the front plate are near the discharge areas of the individual discharge cells, the phosphor layer is scattered by the defective barrier ribs, affecting the discharge state of the discharge cells and increasing the discharge voltage. In addition, erroneous discharge to adjacent discharge cells, and lighting defects such as non-lighting occurred.

In order to prevent the partition wall from being broken, an example in which the partition wall has a two-layer structure and a black porous layer mainly composed of aluminum oxide (Al ₂ O ₃ ) is formed on the partition wall as a buffer material is known ( For example, see Patent Document 1).

  On the other hand, in order to improve the brightness of the PDP, a PDP having a grid-shaped barrier rib with a vertical barrier rib and a horizontal barrier rib as a barrier rib is provided with a raised portion on the vertical barrier rib in order to increase the exhaust efficiency of the discharge space. There are known examples relating to the height of the partition walls, such as partially changing the height of the partition walls, and making the tops of the partition walls perpendicular to the address electrodes concave to facilitate exhaust and gas sealing (for example, Patent Document 2, 3).

  However, miniaturization of discharge cells is required in response to the recent demand for higher definition of display images. In order to realize these high-quality discharge cells with high quality and high yield, and to realize high-quality display images, a discharge cell structure with few barrier rib defects caused by dropping or vibration even when the barrier rib width is reduced, and adjacent discharge Realization of a discharge cell structure that suppresses the influence of discharge between cells, that is, discharge crosstalk, is desired.

On the other hand, Patent Document 1 discloses a barrier rib structure for improving the barrier rib strength, but it is not sufficient for suppressing defects in a barrier rib having a small barrier rib width of a fine discharge cell such as for full high vision, and discharge between adjacent discharge cells. There is no effect in suppressing crosstalk. Further, Patent Document 2 and Patent Document 3 relating to the grid-shaped barrier rib structure effective for improving the luminance of the fine discharge cell disclose examples of the barrier rib height particularly for the purpose of efficiency of exhaust and gas filling. In addition, there was no effect in terms of suppression of barrier rib defects and discharge crosstalk. In addition, since the height changes due to stress concentration in the vicinity of the intersection with the horizontal partition in the vertical partition due to miniaturization, the contact point with the bulge of the protective layer at the position of the display electrode on the front plate varies, and the contact To reduce the number of points and increase rib defects, or to increase the intersection of the vertical and horizontal partition walls as in other examples, adding another process increases costs.
JP 2004-158345 A JP 2001-093425 A JP 2001-126624 A

  In order to achieve further improvement in quality of the PDP and improvement in yield, one of the problems is the lack of partition walls due to dropping or vibration. In addition, miniaturization of PDP cells is indispensable for improving efficiency and increasing the number of pixels, and it is indispensable to narrow the width of the partition walls. Occurred. If the partition wall is chipped, the light emission behavior of the cell changes, which may cause flashing or non-lighting.

  Further, with the increase in definition, there has been a problem that discharge crosstalk in the direction of the display electrode in the vicinity of the discharge gap tends to occur.

  An object of the present invention is to solve these problems and to realize a high-efficiency, high-pixel PDP as well as high quality and high yield.

  In order to achieve the above object, the PDP of the present invention forms a display electrode composed of a sustain electrode and a scan electrode by providing a discharge gap on a glass substrate and forms a dielectric layer so as to cover the display electrode. A front plate in which a protective layer is formed on the dielectric layer, and an address that forms a discharge cell by forming a discharge space in the front plate and facing each other and on the glass substrate in a direction perpendicular to the display electrode A back plate formed with electrodes, partition walls arranged to partition the discharge cells, and phosphor layers disposed in the discharge cells, the partition walls being vertical partition walls arranged in parallel with the address electrodes; The discharge space is divided into discharge cells, and the height of the vertical barrier rib at the intersection with the horizontal barrier rib is indicated by H1. When the height at the position of the pole discharge gap is H2, and the height at a predetermined position from the position of the discharge gap to the intersection with the horizontal barrier rib is H3, the vertical barrier rib is H2 ≧ H1> H3. The vertical barrier rib is configured such that the distance between the vertical barrier rib and the front plate is the smallest at the position of the discharge gap of the display electrode.

  According to the PDP of the present invention, it is possible to suppress the partition wall chipping caused by dropping or vibration of the PDP, and to realize a high quality and high yield PDP.

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

  First, the structure of the PDP in the embodiment of the present invention will be described with reference to FIG. FIG. 1 is an exploded perspective view showing the structure of a PDP according to an embodiment of the present invention. As shown in FIG. 1, the PDP includes a front plate 20 and a back plate 30, and the front plate 20 and the back plate 30 are opposed to each other so as to form a discharge space. In the front plate 20, a plurality of stripe-shaped display electrodes 24 that are paired with a scanning electrode 22 and a sustaining electrode 23 are formed on a front glass substrate 21. Between adjacent display electrodes 24, black stripes 25 serving as light shielding portions are formed. A dielectric layer 26 is formed so as to cover the display electrode 24 and the black stripe 25, and a protective layer 27 made of magnesium oxide (MgO) is further formed so as to cover the dielectric layer 26.

  The back plate 30 has an address electrode 32 formed on the back glass substrate 31 in a direction orthogonal to the display electrode 24 of the front plate 20, and a base dielectric layer 33 is provided to cover the address electrode 32. On the base dielectric layer 33, there are provided barrier ribs 34 formed in a grid pattern by vertical barrier ribs 34 a in a direction parallel to the address electrodes 32 and horizontal barrier ribs 34 b in a direction orthogonal to the address electrodes 32. A phosphor layer 35 is provided on the side surfaces of the first and second base dielectric layers 33. In the discharge space 40 partitioned by the adjacent barrier ribs 34, the phosphor layer 35 has a red phosphor layer that emits red light for each address electrode 32, a green phosphor layer that emits green light, and a blue phosphor layer that emits blue light. Are formed in order.

  The front plate 20 and the back plate 30 are arranged to face each other so that the display electrode 24 and the address electrode 32 intersect each other, and the peripheral edge thereof is sealed and joined with a sealing material. The discharge space 40 is filled with, for example, a mixed gas of neon (Ne) and xenon (Xe) as a discharge gas. By selectively applying a video signal voltage to the display electrode 24, the discharge gas is discharged, and the ultraviolet rays generated thereby excite the phosphor layers 35 of the respective colors to emit red, green, and blue colors. Display a color image.

  As shown in FIG. 1, the vertical partition walls 34a and the horizontal partition walls 34b have different partition wall heights so that the horizontal partition walls 34b are lower than the vertical partition walls 34a.

  FIG. 2 shows a plan view of the PDP as seen from the front glass substrate 21 side of the front plate 20. The display electrode 24 is configured by arranging the scan electrode 22 and the sustain electrode 23 with the discharge gap 50 interposed therebetween. In addition, a rectangular region defined by the vertical barrier ribs 34a and the horizontal barrier ribs 34b and orthogonal to the display electrodes 24 and the address electrodes 32 constitutes a discharge cell 51 as a unit light emitting region. In the discharge cells 51, a non-discharge region 52 is formed between adjacent discharge cells 51, that is, between adjacent display electrodes 24, and a light shielding layer 25 that improves contrast is formed on the front glass substrate 21 in this region. Therefore, the horizontal barrier rib 34b is formed in the non-discharge region 52, and the light shielding layer 25 is formed at a position corresponding to the horizontal barrier rib 34b.

  FIG. 3 is a cross-sectional view in a direction perpendicular to the display electrode 24 of the front panel 20 of the PDP according to the present embodiment. As shown in FIG. 3, the scan electrode 22 and the sustain electrode 23 that constitute the display electrode 24 provided on the front plate 20 are made of transparent electrodes 22a and 23a and a material having high conductivity such as a silver (Ag) material, respectively. Bus electrodes 22b and 23b. The transparent electrodes 22a and 23a are formed of a thin film ITO or the like, and form a discharge gap 50 and transmit light generated from the discharge cells.

  As shown in FIG. 3, in this embodiment, the bus electrodes 22b and 23b are arranged at positions close to the discharge gap on the transparent electrodes 22a and 23a. Since the bus electrodes 22b and 23b are formed by a thick film formation method of silver material in order to ensure conductivity, the dielectric layer 26 formed to cover the display electrodes 24 is formed on the bus electrodes 22b and 23b. The raised portion 55 is formed at the corresponding position. Since the protective layer 27 formed on the dielectric layer 26 is formed by a thin film forming method, the surface of the protective layer 27 also has a raised portion 55.

  FIG. 4 is a diagram for explaining the relationship between the height of the vertical partition wall 34a of the PDP and the surface of the front plate 20 in the present embodiment. In FIG. 4, the vertical partition 34 a and the horizontal partition 34 b of the partition 34 are shown as the back plate 30, and the upper end portion of the vertical partition 34 a is indicated by a solid line A. The front plate is formed between the scanning electrode 22 composed of the transparent electrode 22a and the bus electrode 22b, the sustain electrode 23 composed of the transparent electrode 23a and the bus electrode 23b, and the display electrode 24 composed of them. The solid line B indicates the surfaces of the light shielding layer 25 provided in the non-discharge region and the protective layer 27 formed on the dielectric layer 26.

  As shown in FIG. 4, in the PDP according to the present embodiment, in the vertical barrier rib 34a, the height at the intersection 56 with the horizontal barrier rib 34b is H1, and the height of the region corresponding to the region of the discharge gap 50 of the display electrode 24 is shown. H2 and the height of a predetermined position in the region from the region corresponding to the region of the discharge gap 50 to the intersection 56 with the horizontal barrier rib 34b is H3, the vertical barrier rib 34a has a shape satisfying H2 ≧ H1> H3 It is said. The predetermined position corresponding to H2 is the position of the bus electrodes 22b and 23b.

  In the conventional case, as shown in FIG. 5, when the front plate 20 and the back plate 30 are arranged to face each other and the vertical partition walls 34 a of the back plate 30 and the protective layer 27 of the front plate 20 are brought into contact with each other, The raised portion 55 of the protective layer 27 corresponding to the position of the bus electrodes 22b and 23b and the vertical partition wall 34a come into contact with each other with a contact pressure stronger than that in other regions, and a region where stress is generated strongly against the partition wall is obtained. In the case of a fine discharge cell for full high vision or the like, the partition wall 34 has a small partition width and induces partition defects by applying a slight stress such as impact or vibration, particularly in the regions on the bus electrodes 22b and 23b. It tends to occur. Further, along with miniaturization, the slight loss of the vertical barrier ribs 34a causes the phosphor layer 35 in the discharge cell 40 to scatter and adhere to the protective layer 27, resulting in a display image such as an increase in discharge voltage or non-lighting. This causes quality degradation.

  Further, due to misalignment at the time of bonding, only one of the sustain electrode and the operation electrode comes into contact with the partition wall, and there is a possibility that the partition wall is likely to be lost. In addition, the stress of the intersecting portion of the partition wall varies depending on the cell size and line width, and the height of H3 is variously different, so that it may be difficult to perform control corresponding to the height. Moreover, if the above-mentioned intersection of the vertical and horizontal partition walls is excessively raised in order to suppress this change, there is a possibility that crosstalk with adjacent cells is likely to occur.

  On the other hand, in the present embodiment, as shown in FIG. 4, the position of the metal electrode on the front plate is arranged in the vicinity of the discharge gap, and the height of the vertical barrier ribs 34a is most stable (intersection of the vertical-horizontal barrier ribs). By making contact with the front plate 20 at the portion facing the discharge gap (which is most unlikely to receive the stress of (1)), the rising of the front plate and the stable region of the partition of the back plate can be contacted stably. At the same time, the contact point between the front plate and the back plate can be increased to two locations in one cell rather than supporting at the intersection, and the influence of the impact at the time of contact can be dispersed. Moreover, in this method, it is not necessary to increase the intersection of the vertical and horizontal partition walls, and an increase in cost can be suppressed. Furthermore, it is possible to obtain the effect of suppressing the crosstalk by supporting the crosstalk with the adjacent cell most easily at the two portions.

  In the PDP according to the embodiment of the present invention, the vertical partition wall 34a and the horizontal partition wall 34b have different partition wall heights and the horizontal partition wall 34b has a smaller height than the vertical partition wall 34a. is doing. In particular, in the case of a fine discharge cell, it is useful to improve the display image quality such as brightness, and the double-layered girder structure is useful in terms of exhaust and gas filling. The present invention is not limited to this, and the effect is exhibited even in a grid structure with the same vertical and horizontal height.

  Further, in the embodiment of the present invention, the above-described barrier rib structure in which the barrier rib height of the vertical barrier rib is controlled is realized by using a barrier rib forming method using a photosensitive barrier rib material. Yes. That is, on the rear glass substrate 31 on which the address electrode 32 and the base dielectric layer 33 are formed, a first barrier rib forming material layer made of a barrier rib material and a photosensitive resin material is applied to a predetermined thickness and dried. Thereafter, exposure is performed in accordance with the shape pattern of the horizontal partition wall 34b. Further, the second partition wall forming material layer having the same composition as described above is applied thereon with a predetermined thickness, dried, and then exposed in accordance with the shape pattern of the vertical partition walls 34a. In this way, by developing the barrier rib forming material layer that has been exposed twice, a cross-girder structure can be formed, and the photosensitive resin material is burned away by baking, so that the barrier rib having a two-layered girder structure only of the barrier rib material is formed. Can be formed.

  That is, the application of the first partition wall forming material layer is a partition wall forming material layer corresponding to the height of the horizontal partition wall 34b, and the subsequent application of the second layer is a step between the vertical partition wall 34a and the horizontal partition wall 34b. It is a partition wall formation material layer corresponding to.

  Even when the vertical and horizontal heights of the partition walls are different or the same, the vicinity of the intersection becomes low due to shrinkage stress due to firing. Therefore, as described above, the vertical partition wall includes the horizontal partition wall. H1 is the height at the intersection of the display electrode, H2 is the height at the position of the discharge gap of the display electrode, and H3 is the height at a predetermined position from the position of the discharge gap to the intersection with the horizontal barrier rib. When it does, H1 or H3 will become low. Furthermore, the heights of H1 and H3 may easily vary due to in-plane variations in the width and height of the vertical and horizontal barrier ribs.

  In the present embodiment, the number of contact points in the entire surface is increased and the defect of the partition wall is suppressed by contacting the front plate at the H2 portion that is least affected by the intersection of the vertical and horizontal partition walls. Can do.

  As described above, according to the present invention, it is possible to realize a high quality and high yield PDP.

The disassembled perspective view which shows the structure of PDP in one embodiment of this invention In the same PDP, a plan view seen from the front glass substrate side of the front plate In the same PDP, a sectional view in a direction perpendicular to the display electrode of the front plate Explanatory drawing for demonstrating the relationship between the height of a vertical partition and the surface of a front plate in the PDP. Explanatory drawing for demonstrating the relationship between the height of a vertical partition and the surface of a front plate in the conventional PDP.

DESCRIPTION OF SYMBOLS 20 Front plate 21 Front glass substrate 22 Scan electrode 22a, 23a Transparent electrode 22b, 23b Bus electrode 23 Sustain electrode 24 Display electrode 25 Light-shielding layer 26 Dielectric layer 27 Protection layer 30 Back plate 31 Back glass substrate 32 Address electrode 33 Base dielectric Layer 34 Partition 34a Vertical partition 34b Horizontal partition 35 Phosphor layer 40 Discharge space 50 Discharge gap 51 Discharge cell 52 Non-discharge region 55 Swelling portion 56 Intersection

Claims (5)

A front plate in which a discharge gap is provided on a glass substrate to form a display electrode composed of a sustain electrode and a scan electrode, and a dielectric layer is formed so as to cover the display electrode and a protective layer is formed on the dielectric layer; The barrier ribs are disposed to face each other by forming a discharge space in the front plate and to be arranged on the glass substrate in a direction perpendicular to the display electrodes so as to partition the discharge cells from the address electrodes constituting the discharge cells. And a back plate formed with a phosphor layer disposed in the discharge cell, the barrier ribs being arranged in parallel with the address electrodes, and horizontal barrier ribs arranged so as to intersect the vertical barrier ribs. And the discharge space is partitioned into discharge cells, and in the vertical barrier rib, the height at the intersection with the horizontal barrier rib is H1, and the height at the position of the discharge gap of the display electrode is H2. When the height at a predetermined position from the position of the discharge gap to the intersection with the horizontal barrier rib is H3, the vertical barrier rib has a shape satisfying H2 ≧ H1> H3, and the vertical barrier rib is A plasma display panel, wherein the distance between the display electrode and the front plate is the smallest at the position of the discharge gap of the display electrode. The sustain electrode and the scan electrode of the front plate include a transparent electrode and a bus electrode, respectively, and the bus electrode is disposed at a position near the discharge gap on the transparent electrode. The plasma display panel as described. The plasma display panel according to claim 1, wherein the horizontal barrier rib is formed in a non-discharge region of the discharge space. The plasma display panel according to claim 1, wherein a light shielding layer is formed on the front plate at a position corresponding to the horizontal barrier rib. The plasma display panel according to claim 1, wherein a partition wall height of the horizontal partition wall is smaller than a partition wall height of the vertical partition wall.

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