JP2005100735A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP in which the discharge characteristics are stabilized by shortening the delay of discharge at the time of address and the voltage to be impressed on a data electrode can be established low and which has a high reliability. <P>SOLUTION: In the PDP which comprises a priming discharge cell 16 that makes priming discharge between a front substrate 1 and a rear substrate 2, a data electrode 10 and a priming electrode 15 are covered by a first dielectric layer 17 and a second dielectric layer 18 at the rear substrate 2, and the dielectric constant of all or a part of the first dielectric layer 17 and the second dielectric layer 18 in the region 20 corresponding to a main discharge cell 12 is made larger than the dielectric constant in other regions. <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). A discharge cell partitioned by barrier ribs is provided between the front plate and the rear plate, and a phosphor layer is formed on 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, Patent Documents). 2).
JP 2001-195990 A JP 2002-297091 A

  However, in these PDPs, when the number of lines is increased due to high definition, the time spent in the address period becomes longer, and the time spent in the maintenance period must be reduced, and it is difficult to secure luminance when the definition is increased. The problem arises. Furthermore, in order to achieve high brightness and high efficiency, even when the partial pressure of xenon (Xe), which is a discharge gas, is increased, the discharge start voltage increases, the discharge delay increases, and the address characteristics deteriorate. There was a problem.

  In response to the demand for shortening the address period even in the case of such high definition, the conventional PDP that performs priming discharge in the front plate surface cannot sufficiently reduce the discharge delay at the time of addressing or has an operating margin of priming discharge. There were problems, such as being small and causing an unstable discharge and unstable operation. 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. The discharge delay at the time of addressing is shortened to stabilize the discharge characteristics, and the voltage applied to the data electrode can be set low, so that a highly reliable PDP can be obtained. The purpose is to provide.

  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 disposed in a direction intersecting the scan electrode and the sustain electrode on the second substrate, a priming electrode disposed in parallel with the scan electrode and the sustain electrode on the second substrate, and on the second substrate A data electrode having a plurality of main discharge cells formed of scan electrodes, sustain electrodes and data electrodes, and a partition formed so as to partition a plurality of priming discharge cells formed of scan electrodes and priming electrodes Is covered with a dielectric layer, and the dielectric constant of all or part of the dielectric layer in the region corresponding to the main discharge cell is made larger than the dielectric constant of the dielectric layer in the other region.

  According to such a configuration, the discharge delay at the time of addressing can be shortened to stabilize the discharge characteristics, and the voltage applied to the data electrode can be set low, thereby realizing a highly reliable PDP.

  Further, it is preferable that the priming electrode is disposed closer to the first substrate than the data electrode, and the dielectric layer is composed of a first dielectric layer covering the data electrode and a second dielectric layer covering the priming electrode. . According to such a configuration, the priming discharge can be surely performed prior to the address discharge, the data electrode and the priming electrode can be insulated, and the voltage applied to the data electrode can be further reduced.

  Furthermore, it is desirable that the dielectric constant of the first dielectric layer in the region corresponding to the main discharge cell is larger than the dielectric constant of the first dielectric layer in the other region. According to this configuration, the voltage applied to the data electrode can be more effectively lowered by increasing the dielectric constant of the first dielectric layer.

  The dielectric constant of the second dielectric layer in the region corresponding to the main discharge cell may be larger than the dielectric constant of the second dielectric layer in the other region. According to such a configuration, the formation process when forming the dielectric layer is easy, and the voltage applied to the data electrode can be lowered.

  Furthermore, the dielectric constant of all or part of the dielectric layer in the region corresponding to the data electrode of the main discharge cell may be larger than the dielectric constant of the dielectric layer in other regions. According to such a configuration, the voltage applied to the data electrode can be reduced more effectively.

  According to the present invention, a PDP having a priming discharge cell that performs priming discharge between a first substrate and a second substrate, stabilizes discharge characteristics by shortening discharge delay at the time of addressing, and data A voltage applied to the electrode can be set low, and a highly reliable PDP can be provided.

  Hereinafter, a PDP according to an embodiment 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 a first embodiment of the present invention, and FIG. 2 is an exploded schematic view of a front substrate side that is a first substrate and a rear substrate side that is a second substrate. It is a disassembled perspective view. As shown in FIG. 1, a glass front substrate 1 as a first substrate and a glass back substrate 2 as a second substrate are arranged to face each other with a discharge space 3 interposed therebetween, and the discharge space. 3 is filled with neon (Ne), xenon (Xe), and the like as gases that radiate ultraviolet rays by discharge.

  As shown in FIGS. 1 and 2, on the front substrate 1, strip-shaped electrode groups that are covered with a front plate dielectric layer 4 and that are paired with a scan electrode 6 and a sustain electrode 7 are parallel to each other. Are arranged as follows. The scan electrode 6 and the sustain electrode 7 are formed so as to overlap the transparent electrode portions 6a and 7a and the transparent electrode portions 6a and 7a, respectively, and a metal electrode portion 6b made of silver or the like for enhancing conductivity. 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. Yes.

  On the back substrate 2, a plurality of strip-like data electrodes 10 are arranged in parallel to each other in a direction intersecting with the scan electrodes 6 and the sustain electrodes 7. A first dielectric layer 17 is formed on the back substrate 2 so as to cover the data electrodes 10. A priming electrode 15 is formed on the first dielectric layer 17 in parallel with the scanning electrode 6. Further, a second dielectric layer 18 is formed on the first dielectric layer 17 so as to cover the priming electrode 15. On the second dielectric layer 18, barrier ribs 11 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 11 is provided so as to intersect the vertical wall portion 11a and a vertical wall portion 11a extending in a direction orthogonal to the scanning electrode 6 and the sustain electrode 7 provided on the front substrate 1, that is, a direction parallel to the data electrode 10. And the horizontal wall portion 11b forming the main discharge cell 12 and the priming discharge cell 16. A phosphor layer 14 is formed in the main discharge cell 12.

  In the priming discharge cell 16, the data electrode 10 is covered with the first dielectric layer 17, the priming electrode 15 is formed on the first dielectric layer 17, and the second dielectric layer 18 is further formed thereon. Yes. Therefore, the priming electrode 15 is provided at a position closer to the scan electrode 6 of the front substrate 1 than the data electrode 10, and the discharge distance between the scan electrode 6 of the front substrate 1 of the main discharge cell 12 and the data electrode 10 is The discharge distance is shortened by the thickness of the first dielectric layer 17. Here, the priming discharge cell 16 faces 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 and faces the sustain electrode 7 is a simple gap portion 13.

  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 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 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 scanning pulse SP _n is applied to the scanning electrodes Y _n, priming discharge occurs between the priming electrode Pr and the scan electrodes Y _n, the main discharge cells (main discharge cell 12 of FIG. 1) Priming particles are supplied. Next, a 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 already been supplied. The discharge delay can be reduced. Here, only the driving sequence of one certain field has been described, but the operation principle in 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 such a configuration, since the priming electrode 15 is formed on the first dielectric layer 17 in the priming discharge cell 16, the data electrode 10 and the priming electrode 15 are provided if the first dielectric layer 17 is appropriately formed. Insulation breakdown voltage can be secured by the first dielectric layer 17, and priming discharge and address discharge can be performed stably. The first dielectric layer 17 provided in the priming discharge cell 16 makes the height of the discharge space of the priming discharge cell 16 smaller than the height of the discharge space 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 and stably generated prior to the address discharge in the main discharge cell 12, and the discharge delay in the main discharge cell 12 is reduced. be able to.

  However, on the back substrate 2, the priming electrode 15 is disposed so as to be orthogonal to the data electrode 10, and a first dielectric layer 17 is provided to insulate the data electrode 10. In addition to the first dielectric layer 17, a second dielectric layer 18 that covers the priming electrode 15 is also formed on the data electrode 9. As a result, the data electrode 10 is covered with two dielectric layers. Will be. Therefore, the strength at which the potential applied to the data electrode 10 oozes out to the surface of the second dielectric layer 18 is reduced, and it is necessary to increase the voltage applied to the data electrode 10 in the address discharge. For this reason, there arises a problem that the operating voltage margin is narrowed and reliability is lowered, and a power loss is increased when charging and discharging the capacitance in the discharge cell.

  FIG. 4 shows the configuration of the back substrate 2 side in the first exemplary embodiment of the present invention, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is an AA cross section of FIG. 4 (a). The figure is shown.

  As shown in FIG. 4, in the first embodiment, in the region 20 corresponding to the main discharge cell 12 of the first dielectric layer 17 formed on the back substrate 2, the dielectric constant is changed to the priming discharge cell 16 and the gap portion. The dielectric constant of the first dielectric layer 17 in other regions such as 13 is larger. Here, the film thickness of the region 20 and other regions are the same.

  As a method of forming the region 20 having a large dielectric constant, a material for increasing the dielectric constant of the material forming the first dielectric layer 17 is a perovskite type oxidation such as titanium oxide, lead titanate, or barium titanate. It is possible to apply pattern formation by a screen printing method or a photolithography method using a dielectric paste to which an object is added.

  As described above, since the dielectric constant of the first dielectric layer 17 provided on the data electrode 10 is increased in the region of the main discharge cell 12, when the voltage is applied to the data electrode 10 during the address discharge, The oozing strength of the potential to the surface of the dielectric layer 18 is increased, and discharge can be generated at a lower voltage. As a result, the operating voltage margin is increased and the reliability can be improved.

  Although the case where the dielectric constant of the first dielectric layer 17 formed on the data electrode 10 is increased in FIG. 4 has been described, the dielectric constant of the second dielectric 18 corresponding to the region of the main discharge cell 12 is described. In addition, increasing the dielectric constant of the region of both the first dielectric layer 17 and the second dielectric layer 18 has the same effect.

  In particular, increasing the dielectric constant for the region corresponding to the main discharge cell 12 of the second dielectric layer 18 is that the thickness of the second dielectric layer 18 is smaller than that of the first dielectric layer 17, Since the second dielectric layer 18 is formed on the first dielectric layer 17, it is easy to pattern the region having a large dielectric constant.

(Second Embodiment)
FIG. 5 shows the configuration of the back substrate 2 side in the second exemplary embodiment of the present invention, FIG. 5 (a) is a plan view thereof, and FIG. 5 (b) is a BB cross section of FIG. 5 (a). .

  As shown in FIG. 5, in the second embodiment, the scan electrode 6 formed on the front substrate 1 in the region corresponding to the main discharge cell 12 of the first dielectric layer 17 formed on the rear substrate 2 and The dielectric constant of only the region 21 where the data electrode 10 intersects is made larger than the dielectric constant of the first dielectric layer 17 in other regions. The method of forming the region 21 having a large dielectric constant is the same as that described in the first embodiment.

  As described in the first embodiment, when a dielectric layer having a large dielectric constant is formed throughout the main discharge cell 12, the driving circuit increases the capacity, and thus the reactive power increases and the power consumption of the PDP. May be increased. On the other hand, in the second embodiment, it is possible to reduce the reactive power by limiting the region where the dielectric constant of the dielectric layer is large as much as possible and suppressing the increase in capacitance.

  According to the second embodiment, since the dielectric constant of the first dielectric layer 17 in the region corresponding to the scan electrode 6 is further increased on the data electrode 10 in the region of the main discharge cell 12, the address discharge is performed. Occasionally, when a voltage is applied to the data electrode 10, the oozing strength of the potential to the surface of the second dielectric layer 18 becomes stronger, discharge occurs at a lower voltage, and the operating voltage margin is large and the reliability is improved with low power consumption. Can be made.

  Although FIG. 5 illustrates the case where the dielectric constant of the first dielectric layer 17 formed on the data electrode 10 is increased, the dielectric constant of the second dielectric 18 is increased, and further Increasing the dielectric constant of both the dielectric layer 17 and the second dielectric layer 18 has the same effect.

  In the first embodiment and the second embodiment, the first dielectric layer 17 formed on the data electrode 10 and the second dielectric layer 18 formed on the priming electrode 15 have a two-layer configuration. The dielectric constant of both or each region corresponding to the main discharge cell 12 region is increased. However, the present invention is not limited to this, and the one-layer dielectric layer having a large dielectric constant in the region of the main discharge cell 12 is not limited thereto. May be provided by patterning, or the same effect can be obtained by adding a third dielectric layer having a higher dielectric constant.

  As described above, according to the embodiment of the present invention, when a voltage is applied to scan electrode 6 and data electrode 10, the dielectric layer having a high dielectric constant provided in the region of main discharge cell 12 with a high dielectric constant is used. In addition, it has the effect of suppressing the potential drop on the surface of the second dielectric layer 18 and increasing the effective potential difference between the data electrode 10 and the scan electrode 6. As a result, the voltage to be applied to the data electrode 10 can be effectively reduced, the operating voltage margin can be increased, and the reactive power when charging and discharging the capacitance can be reduced. Further, it is also effective in suppressing variation in plasma discharge in the main discharge cell 12 and generating uniform discharge.

  The PDP according to the present invention has a priming discharge cell that performs priming discharge between the front substrate and the rear substrate, shortens the discharge delay at the time of addressing, stabilizes the discharge characteristics, and lowers the voltage applied to the data electrode. It can be set and is useful for highly reliable plasma display devices.

Sectional drawing which shows PDP in the 1st Embodiment of this invention Exploded perspective view schematically showing the PDP The wave form diagram which shows an example of the drive waveform for driving PDP in embodiment of this invention (A) Plan view of the back substrate of the PDP in the first embodiment of the present invention (b) AA sectional view of (a) (A) The top view of the back substrate of PDP in the 2nd Embodiment of this invention (b) BB sectional drawing of (a)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Discharge space 4 Front plate dielectric 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 11 Partition 11a Vertical wall part 11b Horizontal wall portion 12 Main discharge cell 13 Air gap portion 14 Phosphor layer 15 Priming electrode 16 Priming discharge cell 17 First dielectric layer 18 Second dielectric layer 20, 21 region

Claims (5)

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 priming electrode disposed on the second substrate in parallel with the scan electrode and the sustain electrode;
A plurality of main discharge cells formed by the scan electrodes, the sustain electrodes, and the data electrodes, and a plurality of priming discharge cells formed by the scan electrodes and the priming electrodes are partitioned on the second substrate. A partition wall formed as follows,
The data electrode is covered with a dielectric layer, and the dielectric constant of all or part of the dielectric layer in the region corresponding to the main discharge cell is made larger than the dielectric constant of the dielectric layer in other regions. Plasma display panel. The priming electrode is disposed closer to the first substrate than the data electrode, and the dielectric layer is composed of a first dielectric layer covering the data electrode and a second dielectric layer covering the priming electrode. The plasma display panel according to claim 1, wherein: The plasma display panel according to claim 2, wherein the dielectric constant of the first dielectric layer in the region corresponding to the main discharge cell is larger than the dielectric constant of the first dielectric layer in the other region. The plasma display panel according to claim 2, wherein the dielectric constant of the second dielectric layer in the region corresponding to the main discharge cell is larger than the dielectric constant of the second dielectric layer in the other region. 5. The dielectric constant of all or part of the dielectric layer in the region corresponding to the data electrode of the main discharge cell is larger than the dielectric constant of the dielectric layer in the other region. The plasma display panel according to any one of the above.

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