JP2005122966A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP which is suitable for high definition, and has stabilized discharge characteristics by reducing discharge delay at the time of addressing, and additionally, has superior image display quality by stabilizing priming discharge. <P>SOLUTION: The PDP includes multilayered first layer barrier ribs 111 and second layer barrier ribs 112 to compart a plurality of main discharge cells 12 composed of scanning electrodes 6, sustaining electrodes 7, and data electrodes 10; and a plurality of priming discharge cells 16 composed of the scanning electrodes 6 and priming electrodes 15. At least the first layer barrier ribs 111 serve as second dielectric layers 18 for covering the priming electrodes 15, and the second layer barrier ribs 112 are formed on the second dielectric layers 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plasma display panel used for a wall-mounted television or a large monitor.

  A typical AC surface discharge plasma display panel (hereinafter referred to as PDP) as an AC type has a front plate made of a glass substrate formed by arraying scan electrodes and sustain electrodes for performing surface discharge, and data electrodes. The back plate made of a glass substrate is placed in parallel so as to form a discharge space in the gap so that both electrodes form a matrix, and the outer periphery is sealed with a sealing material such as glass frit (For example, patent document 1). Discharge cells partitioned by barrier ribs are provided between the substrates, a phosphor layer is formed in the discharge cell space between the barrier ribs, ultraviolet rays are generated by gas discharge, and each color of R, G, B is generated by the ultraviolet rays. The phosphor is excited to emit light and color display is performed.

  In this PDP, one field period is divided into a plurality of subfields and is driven by a combination of subfields that emit light to perform gradation display. Each subfield includes at least an initialization period, an address period, and a sustain period. In order to display image data, different signal waveforms are applied to each electrode in the initialization period, the address period, and the sustain period.

  In the initialization period, for example, a positive pulse voltage is applied to all the scan electrodes, and necessary wall charges are accumulated on the protective film and the phosphor layer on the dielectric layer covering the scan electrodes and the sustain electrodes.

  In the address period, scanning is performed by sequentially applying a negative scanning pulse to all the scanning electrodes, and when there is display data, if a positive data pulse is applied to the data electrode while scanning the scanning electrode, Discharge occurs between the scan electrode and the data electrode, and wall charges are formed on the surface of the protective film on the scan electrode.

  In the subsequent sustain period, a voltage sufficient to maintain the discharge is applied between the scan electrode and the sustain electrode for a certain period. Thereby, discharge plasma is generated between the scan electrode and the sustain electrode, and the phosphor layer is excited to emit light for a certain period. In the discharge space where no data pulse is applied in the address period, no discharge occurs and excitation light emission of the phosphor layer does not occur.

In such a PDP, there is a problem that the address operation becomes unstable due to a large discharge delay in the discharge of the address period, or a long address time is set to complete the address operation and a large time is spent in the address period. There was a problem of becoming too much. In order to solve these problems, there has been proposed a PDP in which an auxiliary discharge electrode is provided on the front plate and the discharge delay is reduced by priming discharge generated by in-plane auxiliary discharge on the front plate side, and a driving method thereof (for example, Patent Documents). 2).
JP 2001-195990 A JP 2002-297091 A

  However, in these PDPs, when the screen is made high definition, the number of scan electrodes increases, and the time spent for the address time during one field period becomes long. For this reason, it is necessary to relatively reduce the time that can be spent in the sustain period, which causes a problem that the luminance is lowered. Furthermore, in order to achieve high brightness and high efficiency, even when the partial pressure of the xenon (Xe) discharge gas is increased, the discharge start voltage increases and the discharge delay increases, and the address operation characteristics deteriorate. There was a problem that it would end up. Therefore, it is required to shorten the address time by reducing the discharge delay during the address operation.

  In response to such a request, the conventional PDP that performs priming discharge in the front plate surface increases the size of each auxiliary discharge cell, and therefore cannot reduce the distance between discharge cells for image display. As a result, there is a problem that high definition is difficult. Further, since the priming discharge is performed in the plane of the front plate, there is a problem that priming particles more than necessary are supplied to adjacent discharge cells to cause crosstalk.

  The present invention has been made in view of the above-described problems, and is suitable for high definition. Further, the discharge delay at the time of addressing can be shortened to stabilize the discharge characteristics, and the priming discharge can be further stabilized. An object of the present invention is to provide a PDP that ensures the shape accuracy of the PDP components and is excellent in image display quality.

  In order to achieve such an object, the PDP according to the present invention is arranged so that the scan electrode and the sustain electrode arranged parallel to each other on the first substrate are opposed to the first substrate with the discharge space interposed therebetween. A data electrode arranged in a direction intersecting the scan electrode and the sustain electrode on the second substrate formed, a first dielectric layer covering the data electrode, and provided on the first dielectric layer and parallel to the scan electrode and the sustain electrode A plurality of main discharge cells formed by scanning electrodes, sustain electrodes and data electrodes, and a plurality of priming discharge cells formed by scanning electrodes and priming electrodes. And at least a lower layer portion of the partition wall is a second dielectric layer covering the priming electrode, and an upper layer portion of the partition wall is provided on the second dielectric layer.

  According to such a configuration, the discharge delay at the time of addressing is shortened to stabilize the discharge characteristics, and insulation between the priming electrode and the discharge space is ensured to stabilize the priming discharge, and the partition wall has excellent shape accuracy. Can be realized.

  Further, the upper layer portion of the barrier rib is composed of a vertical barrier rib extending in a direction parallel to the data electrode, and a horizontal barrier rib intersecting the vertical barrier rib and extending in a direction parallel to the priming electrode, and the priming discharge cells are adjacent to each other. It may be configured. According to such a configuration, the priming discharge cell can be made a continuous discharge cell to promote the diffusion of priming (priming agent for discharge = excited particles), and the shape accuracy of the partition can be maintained when the partition is formed. it can.

  Furthermore, it is desirable that the second dielectric layer, which is the lower layer portion of the barrier rib, and the upper layer portion of the barrier rib are made of the same material. According to such a configuration, it is possible to simplify the firing process when forming the partition walls.

  According to the present invention, it is suitable for high definition, can further reduce the discharge delay at the time of addressing to stabilize the discharge characteristics, and can further stabilize the priming discharge and realize a PDP having excellent image display quality. .

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

  FIG. 1 is a cross-sectional view showing a PDP according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view schematically showing a front plate and a back plate in an exploded manner. As shown in FIG. 1, a front plate 50 composed of a glass front substrate 1 as a first substrate and a back plate 60 composed of a glass back substrate 2 as a second substrate, Are arranged opposite to each other with the discharge space 3 interposed therebetween, and neon (Ne), xenon (Xe), and the like are enclosed in the discharge space 3 as a gas that emits ultraviolet rays by discharge.

  As shown in FIGS. 1 and 2, on the front substrate 1 of the front plate 50, strip-shaped electrode groups that are paired with the scan electrodes 6 and the sustain electrodes 7 are arranged in parallel to each other. Scan electrode 6 and sustain electrode 7 are each formed of transparent electrode portions 6a and 7a made of ITO, silver (Ag), etc., which are formed so as to overlap with transparent electrode portions 6a and 7a, respectively, and to increase conductivity. It consists of metal electrode portions 6b and 7b. Scan electrode 6 and sustain electrode 7 are alternately arranged two by two so as to form scan electrode 6 -scan electrode 6 -sustain electrode 7 -sustain electrode 7. A light absorption layer 8 is provided between two adjacent sustain electrodes 7 and between the scan electrodes 6 to increase the contrast during light emission. An auxiliary electrode 9 is provided on the light absorption layer 8 where the scan electrodes 6 are adjacent to each other, and the auxiliary electrode 9 is connected to one of the adjacent scan electrodes 6 at the non-display portion (end portion) of the PDP. ing. A front plate dielectric layer 4 made of Pb-B glass or the like is formed on the front substrate 1 so as to cover the scan electrode 6, the sustain electrode 7, and the light absorbing layer 8. Layer 5 is formed.

  On the other hand, on the back substrate 2 of the back plate 60, a plurality of strip-like data electrodes 10 are arranged in parallel to each other in a direction orthogonal to the scan electrodes 6 and the sustain electrodes 7 so as to cover the data electrodes 10. A first dielectric layer 17 is formed. A priming electrode 15 is formed on the first dielectric layer 17 in parallel with the scanning electrode 6. In addition, a partition made of Pb—B glass or the like for partitioning a plurality of discharge cells formed by the scan electrode 6, the sustain electrode 7, and the data electrode 10 is formed on the first dielectric layer 17. Yes. The barrier ribs are provided so as to intersect with the vertical barrier ribs extending in a direction orthogonal to the scan electrodes 6 and the sustain electrodes 7 provided on the front substrate 1, that is, in a direction parallel to the data electrodes 10. And a horizontal barrier rib that forms the priming discharge cell 16.

  The partition wall is composed of a two-layer partition wall member, and includes a first layer partition wall 111 which is a lower layer portion of the partition wall and a second layer partition wall 112 which is an upper layer portion of the partition wall. The first layer barrier rib 111 includes a first horizontal barrier rib 111b that covers the priming electrode 15 and is provided below the priming discharge cell 16, and a first vertical barrier rib 111a that is positioned below the second vertical barrier rib 112a. As a result, the second dielectric layer 18 is formed.

  Further, the second-layer partition 112 is formed on the first-layer partition 111, the second horizontal partition 112b formed in parallel with the scan electrode 6 or the sustain electrode 7 on the first horizontal partition 111b, and the first vertical partition 112b. It is comprised with the 2nd vertical partition 112a formed on the partition 111a. That is, the first-layer partition 111 is cut out in the main discharge cell 12, and the priming electrode 15 and the discharge space 3 are insulated by the first-layer partition 111 in the priming discharge cell 16. .

  The priming electrode 15 is provided at a position closer to the scan electrode 6 than the data electrode 10, and the thickness of the first dielectric layer 17 is larger than the discharge distance between the scan electrode 6 and the data electrode 10 of the main discharge cell 12. The discharge distance is shortened by the amount. Here, the priming discharge cell 16 is opposed to the scan electrode 6 in which the arrangement of the scan electrode 6 and the sustain electrode 7 is the scan electrode 6 -scan electrode 6 -sustain electrode 7 -sustain electrode 7. The cell that is provided at the position facing the sustain electrode 7 is a mere gap 13.

  Further, at least the phosphor layer 14 made of a rare earth phosphor or the like on the first dielectric layer 17 and on the side surface portion formed by the first layer barrier rib 111 and the second layer barrier rib 112 of the main discharge cell 12. Is formed.

  Next, a method for displaying image data on the PDP will be described. As a method for driving the PDP, one field period is divided into a plurality of subfields having a light emitting period weight, and gradation display is performed by a combination of subfields that emit light. Each subfield includes at least an initialization period, an address period, and a sustain period.

FIG. 3 is a waveform diagram showing an example of a drive waveform for driving the PDP in the present invention. First, in the initialization period, in the priming discharge cell (priming discharge cell 16 in FIG. 1) in which the priming electrode Pr (priming electrode 15 in FIG. 1) is formed, a positive pulse voltage is applied to all the scanning electrodes Y (in FIG. 1). Applying to the scan electrode 6), initialization is performed between the scan electrode Y and the priming electrode Pr. In the next address period, a positive potential is always applied to the priming electrode Pr. Therefore, when the scan pulse SP _n is applied to the scanning electrodes Y _n, and priming discharge occurs between priming electrode Pr and the scan electrodes Y _n, primed main discharge cells (main discharge cell 12 of FIG. 1) Particles are supplied. Next, the scan pulse SP _{n + 1} is applied to the scan electrode Y _{n + 1} of the (n + 1) th main discharge cell. At this time, priming discharge has already occurred and priming particles have been supplied. Discharge delay can be reduced. Here, only the driving sequence of one certain field has been described, but the operation principle in the other subfields is also the same.

  In the drive waveform shown in FIG. 3, the above-described operation can be more reliably caused by applying a positive voltage Vpr to the priming electrode Pr in the address period. Note that the voltage Vpr applied to the priming electrode Pr in the address period is desirably set to a value larger than the value of the data voltage Vd applied to the data electrode D (data electrode 10 in FIG. 1).

  Thus, in the priming discharge cell 16, the priming electrode 15 is formed on the first dielectric layer 17. Accordingly, the data electrode 10 and the priming electrode 15 are insulated from each other by the first dielectric layer 17, and the priming discharge and the address discharge can be stably performed without being affected by each other. A priming electrode 15 is provided on the first dielectric layer 17 so that the height of the discharge space 3 of the priming discharge cell 16 is smaller than the height of the discharge space 3 of the main discharge cell 12. Therefore, the priming discharge in the main discharge cell 12 corresponding to the scan electrode 6 can be reliably generated before the address discharge, and the discharge delay in the main discharge cell 12 can be further reduced.

  As shown in FIGS. 1 and 2, the second dielectric layer 18 provided on the priming electrode 15 is a first layer barrier rib 111 that forms a part of the barrier rib that forms the main discharge cell 12 as described above. is there. Therefore, the thickness can be freely set within the range of the height of the discharge space 3. In the priming discharge cell 16, a dielectric breakdown may occur due to a crack or a bubble generated in the second dielectric layer 18, and when such a dielectric breakdown occurs, a huge bright spot is generated when displaying an image, and the image quality is improved. The problem that it will be greatly lost arises. In general, in such a PDP, the height of the discharge space 3 is around 100 μm, and if the configuration as shown in the embodiment is used, the first-layer barrier rib 111 can be formed as thick as about 50 μm. Become. Accordingly, the second dielectric layer 18 can be formed while ensuring sufficient insulation between the priming electrode 15 and the discharge space 3 of the priming discharge cell 16, and the dielectric breakdown of the second dielectric layer 18 can be prevented. Thus, it is possible to reliably prevent high-quality image display.

  Further, in the embodiment of the present invention, in the main discharge cell 12, only the first dielectric layer 17 is used as the dielectric layer on the data electrode 10, and the insulation between the data electrode 10 and the priming electrode 15 is ensured. Since the thickness only needs to be as large as possible, low voltage address discharge can be realized by suppressing the discharge voltage rise of the address discharge.

  In the embodiment of the present invention, the second dielectric layer 18 provided on the priming electrode 15 forms the first layer barrier rib 111 among the barrier ribs forming the main discharge cell 12. Therefore, the height of the discharge space 3 can be ensured even if the heights of the second vertical barrier ribs 112a and the second horizontal barrier ribs 112b of the second layer barrier rib 112 are small. FIG. 4 is a cross-sectional view showing a PDP as a comparative example, where the height of the vertical barrier rib and the horizontal barrier rib is relatively large, and there is no connecting member between the adjacent horizontal barrier ribs, and the shape of the barrier rib changes during the barrier rib forming process. It is the figure which showed a mode that it does. In the comparative example shown in FIG. 4, the dielectric layer 30 covering the priming electrode 15 is formed on the entire surface, and the barrier ribs are formed as separate members on the dielectric layer 30, and are relatively adjacent to each other in the priming discharge cell 16. The main discharge cells 12 are connected in the form of a lattice by the vertical barrier ribs 41. In the process of solidifying these partition members, a stress as indicated by an arrow 42 is generated particularly by contraction of the vertical partition 41. Therefore, when the horizontal barrier ribs 40 are collapsed, the shape cannot be maintained, and discharge crosstalk occurs between adjacent discharge cells.

  Meanwhile, according to the embodiment of the present invention, the height of the second horizontal barrier rib 112b formed by the second layer barrier rib 112 can be reduced and the first horizontal barrier rib of the first layer barrier rib 111 can be reduced. 111b serves as a reinforcing member against contraction stress in the priming discharge cell 16 region. Therefore, it is possible to solve problems such as the shape accuracy of the partition walls being impaired by the stress generated during the solidification process of the partition walls. Therefore, in the priming discharge cell 16, it is not necessary to provide vertical barrier ribs that connect the adjacent second horizontal barrier ribs 112b in order to ensure the shape accuracy, so that a continuous passage of priming particles can be formed, and even with a large screen size. Stable priming particles can be supplied over the entire area of the screen.

  The PDP in the embodiment of the present invention can be manufactured by the following method. That is, a photosensitive paste material obtained by mixing glass powder and a photosensitive organic material is used as a material for forming the barrier ribs, the priming electrode 15 is formed on the first dielectric layer 17, and the material of the first barrier rib 111 Is applied and dried to expose a pattern having a predetermined shape. Next, the material of the second layer partition 112 is applied and dried, and pattern exposure of a predetermined shape is performed. Thereafter, the first-layer partition walls 111 and the second-layer partition walls 112 are developed at the same time, and then fired and solidified at the same time. As described above, according to the embodiment of the present invention, by using the same material for the first-layer partition 111 and the second-layer partition 112, simultaneous development, simultaneous firing, etc. are possible, and the man-hour is reduced. It is possible to realize a PDP having excellent shape accuracy by this method.

  The PDP according to the present invention is suitable for high definition, further can shorten the discharge delay at the time of addressing and can stabilize the discharge characteristics, further stabilize the priming discharge and have excellent image display quality, Useful for display devices such as large monitors.

Sectional drawing which shows PDP in embodiment of this invention Exploded perspective view schematically showing the PDP Waveform diagram showing an example of a drive waveform for driving the PDP Sectional drawing which shows PDP as a comparative example with this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Discharge space 4 Front plate dielectric layer 5 Protective layer 6 Scan electrode 6a, 7a Transparent electrode part 6b, 7b Metal electrode part 7 Sustain electrode 8 Light absorption layer 9 Auxiliary electrode 10 Data electrode 12 Main discharge cell DESCRIPTION OF SYMBOLS 13 Space | gap part 14 Phosphor layer 15 Priming electrode 16 Priming discharge cell 17 1st dielectric layer 18 2nd dielectric layer (1st layer partition)
30 Dielectric Layer 40 Horizontal Partition 41 Vertical Partition 50 Front Plate 60 Back Plate 111 First Layer Partition 111a First Vertical Partition 111b First Horizontal Partition 112 Second Layer Partition 112a Second Vertical Partition 112b Second Horizontal Partition

Claims (3)

A scan electrode and a sustain electrode arranged parallel to each other on the first substrate;
A data electrode disposed in a direction intersecting the scan electrode and the sustain electrode on a second substrate opposed to the first substrate across a discharge space;
A first dielectric layer covering the data electrode;
A priming electrode provided on the first dielectric layer and disposed in parallel with the scan electrode and the sustain electrode;
A plurality of main discharge cells formed by the scan electrode, the sustain electrode, and the data electrode, and a multi-layered partition wall that partitions the plurality of priming discharge cells formed by the scan electrode and the priming electrode And
A plasma display panel, wherein at least a lower layer portion of the partition wall forms a second dielectric layer covering the priming electrode, and an upper layer portion of the partition wall is provided on the second dielectric layer. The upper part of the barrier rib is composed of a vertical barrier rib extending in a direction parallel to the data electrode and a horizontal barrier rib intersecting the vertical barrier rib and extending in a direction parallel to the priming electrode, and a priming discharge cell is formed by the adjacent horizontal barrier ribs. The plasma display panel according to claim 1, wherein the plasma display panel is configured. The plasma display panel according to claim 2, wherein the second dielectric layer, which is a lower layer portion of the barrier rib, and the upper layer portion of the barrier rib are made of the same material.

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