JP2005216592A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superior plasma display panel in image display quality by stabilization of discharge characteristics by shortening an electric discharge delay in address action even if high precision is realized, and by realization of a stable address discharge and a priming discharge. <P>SOLUTION: This panel has a plurality of main discharge cells 15 formed by scanning electrodes 6, maintenance electrode 7, and data electrode 10, and has barrier ribs 13 formed so as to section a plurality of priming discharge cells 16 formed by the scanning electrodes 6 and the priming electrodes 12, and a second dielectric layer 20 and fluorescent material layer 41 for insulation are installed in the priming discharge cell 16. <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. And a back plate made of a glass substrate. The scan electrode, the sustain electrode, and the data electrode are arranged to face each other so as to form a matrix and to form a discharge space in the gap, and the outer periphery thereof is sealed with a sealing material such as a glass frit (for example, a patent) Reference 1). Discharge cells partitioned by barrier ribs are provided between the front plate and the rear plate, and a phosphor layer is formed in the discharge cells between the barrier ribs. In the PDP having such a configuration, color display is performed by generating ultraviolet rays by gas discharge and exciting the phosphors of R, G, and B colors with the ultraviolet rays to emit light.

  The PDP divides one field period 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, a large discharge delay occurs in the discharge during the address period, and the address operation becomes unstable, or the address time is set long to perform the address operation completely, and the time spent in the address period becomes too long. There was a problem. 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, a patent) Reference 2).
JP 2001-195990 A JP 2002-297091 A

  However, in such a PDP, when the number of scan electrodes is increased due to high definition, the time spent in the address period becomes longer, so the time spent in the sustain period must be reduced, and it is difficult to ensure luminance. Occurs. Furthermore, when the partial pressure of xenon (Xe), which is a discharge gas, is increased in order to achieve high luminance and high efficiency, the discharge start voltage increases and the discharge delay increases, resulting in deterioration of address characteristics. Challenges arise.

  In response to the demand for shortening the address period even in such a high definition, the conventional PDP that performs priming discharge in the plane of the front plate cannot sufficiently reduce the discharge delay at the time of addressing, or the priming discharge operating margin. However, there are problems such as small insufficiency and instability of operation caused by erroneous discharge. Further, since priming discharge is performed in the plane of the front plate, there is a problem that priming particles more than particles necessary for priming are supplied to adjacent discharge cells to cause crosstalk.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a PDP having excellent display image quality by shortening a discharge delay during an address operation.

  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 priming electrodes, a plurality of main discharge cells formed of scan electrodes, sustain electrodes, and data electrodes; and a partition that partitions a plurality of priming discharge cells formed of the scan electrodes and priming electrodes The second dielectric layer is provided in the priming discharge cell, and the phosphor layer is provided on the second dielectric layer.

  According to such a configuration, the discharge delay during the address operation is shortened to stabilize the discharge characteristics, and further, the insulation between the priming electrode and the discharge space is ensured to stabilize the priming discharge, and the display image quality is improved. Can realize an excellent PDP.

  Further, a scan electrode and a sustain electrode arranged so as to be parallel to each other on the first substrate, and a scan electrode and a sustain electrode arranged on the second substrate opposed to each other with a discharge space interposed therebetween Data electrodes arranged in intersecting directions, a first dielectric layer covering the data electrodes, a plurality of priming electrodes provided on the first dielectric layer and arranged in parallel with the scan electrodes and sustain electrodes, and the scan electrodes and sustain electrodes And a plurality of main discharge cells formed by the data electrodes, and a partition wall that partitions the plurality of priming discharge cells formed by the scan electrodes and the priming electrodes, and a phosphor layer is provided in the priming discharge cells. The second dielectric layer may be provided on the phosphor layer. Even with such a configuration, it is possible to stabilize the priming discharge by securing the insulation between the priming electrode and the discharge space, and it is also possible to improve the contrast during image display.

  According to the PDP of the present invention, by stably generating the priming discharge, it is possible to shorten the discharge delay during the address operation even in the high-definition PDP. And the quality of the display image of PDP can be improved.

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

(First embodiment)
FIG. 1 is a cross-sectional view showing a PDP according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing a structure of a back plate. As shown in FIG. 1, in the PDP, a front plate 50 made of a glass front substrate 1 as a first substrate and a back plate 60 made of a back substrate 2 as a second substrate form a discharge space 3. The outer peripheral portions are arranged to be opposed to each other with a sealing material such as glass frit 40 interposed therebetween. Neon (Ne), xenon (Xe), and the like are sealed in the discharge space 3 as discharge gases that emit ultraviolet rays by discharge.

  On the front substrate 1 of the front plate 50, strip-shaped electrode groups that are paired with the scanning electrodes 6 and the sustaining electrodes 7 are arranged in parallel to each other. Scan electrode 6 and sustain electrode 7 are each composed of transparent electrodes 6a and 7a and metal buses 6b and 7b formed to overlap with transparent electrodes 6a and 7a and made of silver or the like for enhancing conductivity. Has been. 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 made of a black material or the like is provided between the two adjacent sustain electrodes 7 and between the scan electrodes 6 to increase the contrast during light emission. On the light absorption layer 8 where the scan electrodes 6 are adjacent to each other, an auxiliary electrode 9 is provided by extending a metal bus 6 b from one of the scan electrodes 6. A front plate dielectric layer 4 made of lead-boron (Pb-B) glass or the like is formed so as to cover the scan electrode 6, the sustain electrode 7, and the light absorption layer 8, and magnesium oxide (MgO) is further formed thereon. ) Or the like is formed.

  Further, as shown in FIGS. 1 and 2, a plurality of band-like data electrodes 10 are arranged in parallel to each other on the back substrate 2 of the back plate 60 in a direction orthogonal to the scan electrodes 6 and the sustain electrodes 7. A base dielectric layer 11 serving as a first dielectric layer is provided so as to cover the data electrode 10. On the underlying dielectric layer 11, a priming electrode 12 parallel to the scan electrode 6 and the sustain electrode 7 is provided at a position corresponding to the auxiliary electrode 9 provided on the front substrate 1.

  On the underlying dielectric layer 11, barrier ribs 13 for partitioning a plurality of discharge cells formed by the scan electrodes 6, the sustain electrodes 7 and the data electrodes 10 are formed. The partition wall 13 includes a vertical partition wall 13b extending in a direction orthogonal to the scan electrode 6 and the sustain electrode 7 provided on the front substrate 1, that is, a direction parallel to the data electrode 10, and a horizontal wall provided so as to intersect the vertical partition wall 13b. It is comprised with the partition 13a.

  A plurality of main discharge cells 15 for discharging with the scan electrode 6, the sustain electrode 7 and the data electrode 10, and a plurality of priming discharge cells 16 for discharging with the auxiliary electrode 9 and the priming electrode 12 are formed. . Further, a gap portion 17 is formed on the back substrate 2 side corresponding to the adjacent sustain electrode 7 of the front plate 50. Therefore, the main discharge cells 15 are formed in a grid pattern by the horizontal barrier ribs 13a and the vertical barrier ribs 13b provided so as to intersect the horizontal barrier ribs 13a.

  A second dielectric layer 20 is provided in the priming discharge cell 16 so as to cover the priming electrode 12. Further, an insulating phosphor layer 41 is provided on the second dielectric layer 20 and serves as a phosphor layer for insulating the priming electrode 12 and the discharge space.

  As shown in FIG. 1, a phosphor layer 19 is formed on the side surface of each partition wall 13 and the underlying dielectric layer 11 in the main discharge cell 15. The phosphor layers 19 are alternately formed with phosphor layers 19 that emit red, blue, and green light by ultraviolet rays corresponding to the data electrodes 10 provided on the back plate 60. That is, the same color phosphor layer 19 is formed in the main discharge cells 15 provided on the same data electrode 10.

  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 has 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 first embodiment of 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 12 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 15 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, since priming discharge has already occurred and priming particles have been supplied, the next address operation is performed. Time delay (address discharge) 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 to the priming electrode Pr in the address period. Note that the voltage applied to the priming electrode Pr in the address period is desirably set to a value larger than the data voltage value applied to the data electrode D (data electrode 10 in FIG. 1).

  In this way, the data electrode 10 and the priming electrode 12 are insulated by the underlying dielectric layer 11, and the priming discharge and the address discharge can be stably generated without being affected by each other.

  In addition, the priming electrode 12 is provided on the underlying dielectric layer 11 so that the height of the discharge space of the priming discharge cell 16 is smaller than the height of the discharge space of the main discharge cell 15. Therefore, the priming discharge in the main discharge cell 15 corresponding to the scan electrode 6 can be reliably and stably generated before the address discharge, and the delay of the address discharge in the main discharge cell 15 can be further reduced. .

  In addition, since the priming discharge is generated only in the priming discharge cell 16, only the priming particles necessary for priming can be supplied to suppress crosstalk between adjacent discharge cells.

  In addition, the priming discharge is generated only between the scanning electrode 6 and the priming electrode 12, and erroneous discharge between the priming electrode 12 and the sustain electrode 7 can be suppressed.

  In addition, when the address operation is stabilized using such a priming discharge, it is important to stably form the priming discharge itself. For example, when dielectric breakdown occurs in the second dielectric layer 20 on the priming electrode 12, a strong abnormal priming discharge is generated at the portion where the dielectric breakdown occurs, and erroneous discharge in the main discharge cell 15 is induced. Since this erroneous discharge covers a range of several cells, it is observed as a huge bright spot on the display screen, and the quality of the display image of the PDP is remarkably lowered.

  Here, the dielectric breakdown failure or breakdown of the dielectric layer is caused by the film thickness of the dielectric layer being small and the breakdown voltage being low, or by the gas included in the firing process of the dielectric layer or bubbles generated by foreign matter. Occurs when continuous voids are generated in the thickness direction.

  However, in the first embodiment of the present invention, the insulating phosphor layer 41 is formed on the second dielectric layer 20. By adopting such a configuration, while ensuring the withstand voltage required for insulation between the priming electrode 12 and the discharge space, even if there are continuous voids in the film thickness direction in the second dielectric layer 20, The insulating phosphor layer 41 can suppress the generation of voids that continue to the upper discharge space. This is because it is considered that the probability that a continuous gap exists in each of the places where the second dielectric layer 20 and the insulating phosphor layer 41 overlap is very low. Therefore, by forming the insulating phosphor layer 41 on the second dielectric layer 20 as described above, the withstand voltage performance between the priming electrode 12 and the discharge space is improved, and the address discharge and the priming discharge can be stabilized. It is possible to provide a PDP that can be generated and has excellent display image quality.

  Further, the total film thickness necessary for insulation between the priming electrode 12 and the discharge space is a two-layer structure of the second dielectric layer 20 and the insulating phosphor layer 41, so that only the second dielectric layer 20 is formed. You can make it thinner. This is because the withstand voltage of the phosphor is higher than that of the dielectric. Thereby, the height of the discharge space of the priming discharge cell 16 can be reduced, and the discharge voltage during priming discharge can be reduced.

  In addition, light emission from the insulating phosphor layer 41 during priming discharge is blocked by the light absorption layer 8, so that there is no problem in image display.

  A coating method for forming the second dielectric layer 20 and the insulating phosphor layer 41 in the priming discharge cell 16 is not particularly limited, but a paste is formed in a continuous slit like the priming discharge cell 16. As a method of filling the nozzle, a method of scanning the nozzle while discharging the paste from the nozzle is suitable.

(Second Embodiment)
FIG. 4 is an enlarged sectional view showing details of the priming discharge cell 16 region of the PDP in the second embodiment of the present invention.

  As shown in FIG. 4, a priming electrode 12 and a partition wall 13 are formed on the base dielectric layer 11. An insulating phosphor layer 41 is formed in the priming discharge cell 16 partitioned and formed by the barrier ribs 13 so as to cover the priming electrode 12, and the second dielectric layer 20 is formed on the insulating phosphor layer 41. ing. That is, the second embodiment of the present invention is characterized in that the second dielectric layer 20 is provided on the insulating phosphor layer 41. With such a configuration, as in the first embodiment, it is possible to improve the withstand voltage performance between the priming electrode 12 and the discharge space, thereby realizing a stable discharge of the priming discharge.

  Furthermore, according to the second embodiment of the present invention, since the insulating phosphor layer 41 is covered by the second dielectric layer 20, the light emission of the insulating phosphor layer 41 by the priming discharge is caused by the second dielectric. The layer 20 absorbs, and the contrast at the time of image display can be improved as compared with the first embodiment.

  Here, as in the first embodiment described above, a coating method for forming the second dielectric layer 20 and the insulating phosphor layer 41 in the priming discharge cell 16 is not particularly limited. As a method of filling the paste in the continuous slit such as the discharge cell 16, a method of scanning the nozzle while discharging the paste from the nozzle is suitable.

  It is also possible to further improve the contrast during image display by coloring the second dielectric layer in the first embodiment and the second embodiment and increasing the light absorption rate by priming discharge. It is.

  In the first embodiment and the second embodiment of the present invention, the configuration in which the second dielectric layer and the insulating phosphor layer are provided on the priming electrode provided in the priming discharge cell is exemplified. However, the present invention is not limited to these examples. For example, even if the priming electrode is covered with a dielectric layer, a partition is provided on the dielectric layer, and the main discharge cell and the priming discharge cell are partitioned to form an insulating layer in the priming discharge cell. The same effect can be obtained as long as the phosphor layer is provided to improve the withstand voltage performance between the priming electrode and the discharge space.

  The PDP according to the present invention stabilizes the discharge characteristics by shortening the discharge delay during the address operation even when the definition is increased, and further stabilizes the address discharge and the priming discharge by ensuring the insulation between the priming electrode and the discharge space. It is excellent in image display quality and high in reliability, and is useful as a display device such as a wall-mounted television or a large monitor.

Sectional drawing which shows PDP in the 1st Embodiment of this invention The perspective view which shows the structure of the back plate of the PDP Waveform diagram showing an example of a drive waveform for driving the PDP The expanded sectional view which shows the detail of the priming discharge cell area | region of PDP in the 2nd Embodiment of 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 6b, 7b Metal bus 7 Sustain electrode 8 Light absorption layer 9 Auxiliary electrode 10 Data electrode 11 Base dielectric layer 12 Priming electrode 13 Partition 13a Horizontal partition 13b Vertical partition 15 Main discharge cell 16 Priming discharge cell 17 Gap 19 Phosphor layer 20 Second dielectric layer 40 Glass frit 41 Insulating phosphor layer 50 Front plate 60 Back plate

Claims (2)

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 plurality of priming electrodes provided on the first dielectric layer and disposed in parallel with the scan electrodes and the sustain electrodes;
A plurality of main discharge cells formed by the scan electrodes, the sustain electrodes, and the data electrodes; and a partition that partitions a plurality of priming discharge cells formed by the scan electrodes and the priming electrodes;
A plasma display panel, wherein a second dielectric layer is provided in the priming discharge cell, and a phosphor layer is provided on the second dielectric layer. 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 plurality of priming electrodes provided on the first dielectric layer and disposed in parallel with the scan electrodes and the sustain electrodes;
A plurality of main discharge cells formed by the scan electrodes, the sustain electrodes, and the data electrodes; and a partition that partitions a plurality of priming discharge cells formed by the scan electrodes and the priming electrodes;
A plasma display panel, wherein a phosphor layer is provided in the priming discharge cell, and a second dielectric layer is provided on the phosphor layer.

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