JP4277699B2 - Plasma display panel - Google Patents

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 first dielectric layer is composed of at least two layers.

  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 data electrode and the priming electrode is ensured to stabilize the address operation and the priming discharge, and the image A PDP with excellent display quality can be realized.

  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 the sustain electrodes, and the first dielectric layer A plurality of main discharge cells formed on the scan electrodes, the sustain electrodes, and the data electrodes; and a partition wall that partitions the plurality of priming discharge cells formed on the scan electrodes and the priming electrodes; One dielectric layer may be composed of at least two layers. According to such a configuration, the insulation between the data electrode and the priming electrode can be secured to stabilize the address operation and the priming discharge, and the address voltage can be further lowered.

  Furthermore, the structure which provided at least the outermost layer of the 1st dielectric material layer only in the priming discharge cell may be sufficient. According to such a configuration, it is possible to secure the insulation between the data electrode and the priming electrode without further increasing the address voltage, stabilize the address operation and the priming discharge, and realize a PDP excellent in image display quality.

  According to the PDP of the present invention, the discharge delay during the address operation can be shortened even in the high-definition PDP by stably generating the address discharge and the priming discharge. 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 enclosed in the discharge space 3 as discharge gas that radiates 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 on the 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 first dielectric layer 11 is provided so as to cover the data electrode 10. The first dielectric layer 11 has a multilayer structure having at least two layers of a first first dielectric layer 41 and a second first dielectric layer 42. On the second first dielectric layer 42, 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. Further, a second dielectric layer 20 is provided so as to cover the priming electrode 12.

  On the second dielectric layer 20, barrier ribs 13 for partitioning a plurality of discharge cells formed by the scan electrode 6, the sustain electrode 7 and the data electrode 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 lattice shape by the horizontal barrier ribs 13a and the vertical barrier ribs 13b provided so as to intersect the horizontal barrier ribs 13a.

  As shown in FIG. 1, a phosphor layer 19 is formed on the side surface of each partition wall 13 and on the second dielectric layer 20 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 scanning electrode 6), initialization is performed between the scanning 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).

  Thus, the data electrode 10 and the priming electrode 12 are insulated by the first dielectric layer 11 so that the priming discharge and the address discharge are not affected by each other.

  Further, the priming electrode 12 is provided on the second dielectric layer 42 of the second layer, and the height of the discharge space of the priming discharge cell 16 is made 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 priming discharge, it is important to stably form the address discharge and the priming discharge. For example, when dielectric breakdown occurs in the first dielectric layer 11 sandwiched between the data electrode 10 and the priming electrode 12, the data electrode 10 and the priming electrode 12 conduct at the dielectric breakdown portion, and a predetermined voltage is applied. It becomes difficult to apply. As a result, normal address discharge and priming discharge do not occur, the address operation becomes unstable, and the quality of the display image on the PDP deteriorates.

  Here, the dielectric breakdown voltage failure or dielectric breakdown of the dielectric layer is caused by a continuous film thickness in the direction of the film thickness when the dielectric layer is small, or by gas contained in the firing process of the dielectric layer or by foreign matter. Occurs when creating (penetrated) voids.

  However, in the first embodiment of the present invention, the first dielectric layer 11 is formed in a two-layer structure of a first first dielectric layer 41 and a second first dielectric layer 42. Thus, by forming the first dielectric layer 11 in a two-layer structure, a film thickness necessary for insulation between the data electrode 10 and the priming electrode 12 is ensured, and at the same time, in the first first dielectric layer 41. Even if there is a continuous gap in the film thickness direction, the second first dielectric layer 42 can suppress the generation of a continuous gap to the upper discharge space. This is because it is considered that there is a very low probability that there is a continuous gap at the place where the first first dielectric layer 41 and the second first dielectric layer 42 overlap each other. Therefore, by making the first dielectric layer 11 have a two-layer structure as described above, the withstand voltage performance of the first dielectric layer 11 can be improved, and address discharge and priming discharge can be stably generated. A PDP having excellent display image quality can be provided.

  In the first embodiment shown in FIG. 1, the first dielectric layer 11 has a two-layer structure. However, the first dielectric layer 11 is not limited to a two-layer structure. The breakdown voltage performance can be improved.

As the material of the first dielectric layer _{11, (ZnO-B 2 O} 3 -SiO 2) a mixture of _{systems, (PbO-B 2 O 3} -SiO 2) a mixture of _{systems, (PbO-B 2 O 3} -SiO ₂ -Al ₂ O ₃₎ mixture _{system, (PbO-ZnO-B 2} O 3 -SiO 2) mixture based, and _{(Bi 2 O 3 -B 2 O} 3 -SiO 2) based mixtures are used. In the embodiment of the present invention, a (PbO—B ₂ O ₃ —SiO ₂ ) -based mixture has a composition of PbO: 65 wt% to 70 wt% —B ₂ O ₃ : 5 wt% —SiO ₂ : 25 wt% to 30 wt%. These are paste-like and applied so as to cover the data electrode 10. The softening point temperature can be appropriately set mainly by increasing or decreasing the content of PbO.

(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, the first dielectric layer 11 on the data electrode 10 includes a first first dielectric layer 41 and a second first dielectric layer 42, and a second first dielectric layer. A partition wall 13 is formed on the body layer 42. The priming electrode 12 and the second dielectric layer 20 are formed in a priming discharge cell 16 formed by being partitioned by the barrier ribs 13. That is, the second dielectric layer 20 is provided only in the priming discharge cell 16. With such a configuration, as in the first embodiment, the withstand voltage performance of the first dielectric layer 11 between the data electrode 10 and the priming electrode 12 is improved, and the address discharge and the priming discharge are stabilized. Can be generated.

  Furthermore, according to the second embodiment of the present invention, since the dielectric layer on the data electrode 10 is only the first dielectric layer 11 in the main discharge cell 15, the dielectric layer on the data electrode 10 The total thickness is thinner than that of the first embodiment. As a result, the address voltage during address discharge can be reduced.

  The coating method for forming the second dielectric layer 20 in the priming discharge cell 16 is not particularly limited. However, as a method for filling the paste in a continuous slit like the priming discharge cell 16, a nozzle is used. For example, a method of scanning the nozzle while discharging the paste is suitable.

(Third embodiment)
FIG. 5 is an enlarged cross-sectional view showing details of the priming discharge cell 16 region of the PDP in the third embodiment of the present invention.

  As shown in FIG. 5, the first dielectric layer 11 on the data electrode 10 includes a first first dielectric layer 41 and a second first dielectric layer 42, and a first first dielectric layer. A partition wall 13 is formed on the body layer 41. The second first dielectric layer 42, the priming electrode 12, and the second dielectric layer 20 are formed in the priming discharge cell 16 formed by being partitioned by the barrier ribs 13. That is, the second first dielectric layer 42 that is the outermost layer of the first dielectric layer 11 is provided only in the priming discharge cell 16.

  With this configuration, the dielectric breakdown voltage performance of the first dielectric layer 11 between the data electrode 10 and the priming electrode 12 is improved and the address discharge and priming discharge are stably generated as in the first embodiment. Can be made.

  Furthermore, according to the third embodiment of the present invention, in the main discharge cell 15, the dielectric layer on the data electrode 10 is only the first first dielectric layer 41, so that the dielectric on the data electrode 10 is The total thickness of the body layer is further reduced as compared with the first embodiment and the second embodiment. As a result, the address voltage at the time of address discharge can be further reduced, and address discharge at a low voltage can be realized.

  Here, as in the second embodiment described above, the coating method for forming the dielectric layer on the priming discharge cell 16 is not particularly limited. As a method of filling the paste with the paste, a method of scanning the nozzle while discharging the paste from the nozzle is suitable.

  In the above description, the first dielectric layer 11 has two layers and only the second first dielectric layer 42, which is the outermost layer, is provided in the priming discharge cell 16. However, the present invention is not limited to this. is not. That is, when the first dielectric layer 11 is a multilayer, at least one layer constituting the first dielectric layer 11 is provided on the data electrode 10 of the main discharge cell 15, and the other first dielectric layers are provided. 11 can be provided in the priming discharge cell 16, or at least the outermost layer of the first dielectric layer 11 can be provided only in the priming discharge cell 16 to obtain the same effect as described above. Can do.

  In the first to third embodiments described above, each dielectric material in the case where the first dielectric layer has a multilayer structure is not particularly described. For example, the dielectric of each layer is not described. It is possible to control the insulation performance and dielectric properties by changing the rate and changing the softening point temperature. In addition, by coloring the second dielectric layer in the second embodiment and the second first dielectric layer or the second dielectric layer in the third embodiment to absorb light emitted by the priming discharge. It is also possible to improve the contrast during image display.

  In addition, the configuration shown in the first to third embodiments of the present invention is only an example of the present invention, and a region where the data electrode and the priming electrode face each other is formed by a multilayered dielectric layer. If it is the structure which carries out, the same effect can be acquired. Further, the priming electrode may be exposed in the priming discharge cell without forming the second dielectric layer.

  The PDP according to the present invention stabilizes the discharge characteristics by shortening the discharge delay during address operation even when the definition is increased, and suppresses the rise of the address discharge voltage, and further ensures the insulation between the priming electrode and the discharge space. Thus, the address discharge and priming discharge are stabilized, the image display quality is excellent and the reliability is high, and it 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 The expanded sectional view which shows the detail of the priming discharge cell area | region of PDP in the 3rd 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 Suspension electrode 8 Light absorption layer 9 Auxiliary electrode 10 Data electrode 11 1st 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 First Layer First Dielectric Layer 42 Second Layer First Dielectric layer 50 Front plate 60 Back plate

Claims (3)

A scan electrode and a sustain electrode arranged parallel to each other on the first substrate;
A data electrode disposed on a second substrate opposed to the first substrate across a discharge space in a direction intersecting the scan electrode and the sustain electrode;
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;
Have
The plasma display panel, wherein the first dielectric layer is composed of at least two layers. A scan electrode and a sustain electrode arranged parallel to each other on the first substrate;
A data electrode disposed on a second substrate opposed to the first substrate across a discharge space in a direction intersecting the scan electrode and the sustain electrode;
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 provided on the first dielectric layer and formed by the scan electrode, the sustain electrode, and the data electrode, and a plurality of priming discharge cells formed by the scan electrode and the priming electrode A partition wall that divides
Have
The plasma display panel, wherein the first dielectric layer is composed of at least two layers. The plasma display panel according to claim 2, wherein at least an outermost layer of the first dielectric layer is provided only in the priming discharge cell.

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