JP4341442B2 - 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. 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 It is comprised by doing. Discharge cells partitioned by barrier ribs are provided between the substrates, and a phosphor layer is formed in the cell space 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 (see Patent Document 1). .

  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 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 layer 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 layer 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 (see Patent Document 2). ).
JP 2001-195990 A JP 2002-297091 A

  However, in these PDPs, when the number of lines is increased due to higher definition, the time spent for the address time becomes longer, and the time spent for the maintenance period must be reduced, and it is difficult to ensure the luminance when the definition is increased. The problem arises. Furthermore, in order to achieve high brightness and high efficiency, even when the xenon (Xe) partial pressure is increased, the discharge start voltage rises and the initializing discharge becomes unstable, which may result in writing failure. Therefore, there is a problem that the drive voltage margin for the write operation is narrowed.

  The present invention has been made in view of these problems. Even when the definition is increased or the xenon (Xe) partial pressure is increased by stably generating the priming discharge, the initialization operation or the address operation is performed. An object of the present invention is to provide a PDP in which the above is stabilized.

In order to solve the above-described problems, the PDP of the present invention has an electrode group composed of a first electrode and a second electrode on a first substrate, the first electrodes are adjacent to each other, and the second electrodes are adjacent to each other. The auxiliary electrode connected to the first electrode is formed between the adjacent first electrodes, and the first substrate is disposed on the second substrate opposed to the first substrate with the discharge space interposed therebetween. A third electrode is formed in a direction intersecting with the electrode and the second electrode, a fourth electrode is formed in a direction intersecting with the third electrode via a dielectric layer between the third electrode and the discharge space is partitioned. Partition walls forming at least a first discharge space and a second discharge space, and the first discharge space is a main discharge space in which discharge is performed with the first electrode, the second electrode, and the third electrode , and the second discharge space is a priming discharge space to discharge between the auxiliary electrode and the fourth electrode, Plastic The discharge space side of the fourth electrode in the timing the discharge space, oxides of alkali metals, and oxides of alkaline earth metals, or a material layer containing at least one of fluoride provided.

  With this configuration, when priming discharge is performed by using the electrode provided on the second substrate side as a cathode, a material containing at least one of an alkali metal oxide, an alkaline earth metal oxide, or a fluoride When the layer is interposed, the discharge voltage of the priming discharge can be greatly reduced, and the generation of discharge can be made uniform. Therefore, by increasing the operating margin of the priming discharge and reducing the discharge voltage, the priming discharge is stably formed while suppressing the influence on the surroundings such as crosstalk, thereby achieving high definition with excellent address characteristics. A suitable PDP can be realized.

Furthermore, it is desirable to form a dielectric layer so as to cover the fourth electrode, and to provide a material layer on the dielectric layer, so that insulation can be ensured and priming discharge can be stably formed.

In addition, an electrode group composed of the first electrode and the second electrode is formed on the first substrate so that the first electrodes are adjacent to each other and the second electrodes are adjacent to each other, and between the adjacent first electrodes. An auxiliary electrode connected to the first electrode is formed on the second substrate disposed opposite to the first substrate with the discharge space interposed therebetween, and a third electrode is formed in a direction intersecting the first electrode and the second electrode. And at least partition walls that divide the discharge space to form at least the first discharge space and the second discharge space, and the first discharge space discharges with the first electrode, the second electrode, and the third electrode. a main discharge space, the second discharge space is a priming discharge space to discharge between the auxiliary electrode and the third electrode, the second substrate side in the priming discharge space, oxides of alkali metals, alkaline earth metals At least one of oxides or fluorides The material layer is provided comprising or.

  According to this configuration, it is possible to stably form a priming discharge in the initialization period, stabilize the initialization operation, and realize a PDP suitable for high definition.

  In addition, it is desirable that the material layer is made of a material containing MgO as a main component, and the material layer containing MgO as a main component improves electron emission performance and forms a stable priming discharge effectively and reliably. Can do.

  As described above, according to the present invention, the priming discharge is stably generated, so that the initialization operation or the address operation can be stabilized even when the definition is increased or the xenon (Xe) partial pressure is increased. A PDP that displays an image with good quality can be realized.

  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 the first embodiment of the present invention, FIG. 2 is a plan view schematically showing an electrode arrangement on the front substrate side which is the first substrate, and FIG. 3 is a second substrate. It is a perspective view which shows a certain back substrate side typically, and FIG. 4 is the top 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. The front substrate 1 is covered with a dielectric layer 4 and a protective layer (not shown), and has a strip-like shape composed of a scan electrode 6 as a first electrode and a sustain electrode 7 as a second electrode that make a pair. The electrode groups are arranged so as to be parallel to each other. The scan electrode 6 and the sustain electrode 7 are formed on the transparent electrodes 6a and 7a, and the metal buses 6b and 7b formed on the transparent electrodes 6a and 7a, respectively, and made of silver (Ag) for enhancing conductivity. It consists of and. Further, as shown in FIGS. 1 and 2, the scan electrodes 6 and the sustain electrodes 7 are alternately arranged in pairs so as to be a scan electrode 6 -a scan electrode 6 -a sustain electrode 7 -a sustain electrode 7. An auxiliary electrode 17 is formed between two adjacent scanning electrodes 6. Further, the light-absorbing layer 8 for each between two scan electrodes 6 adjacent to between the two sustain electrodes 7 adjacent to enhance the contrast during light emission is provided. The auxiliary electrode 17 is connected to the scanning electrode 6 at a non-display portion (end portion) of the PDP. As shown in FIGS. 1, 3, and 4, on the back substrate 2, a plurality of data electrodes 9 that are strip-shaped third electrodes are parallel to each other in a direction orthogonal to the scan electrodes 6 and the sustain electrodes 7. Are arranged as follows. On the rear substrate 2, barrier ribs 10 for partitioning a plurality of discharge cells formed by the scan electrodes 6, the sustain electrodes 7 and the data electrodes 9 are formed. The partition wall 10 is provided so as to intersect the vertical wall portion 10a and a vertical wall portion 10a 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 9. The main discharge space 11 that is the first discharge space is formed, and the lateral wall portion 10b that forms the gap portion 13 between the main discharge spaces 11 is formed. A phosphor layer 12 is provided in the main discharge space 11.

  Further, as shown in FIG. 3, the gap portion 13 of the back substrate 2 is continuously formed in a direction orthogonal to the data electrodes 9, and only the gap portion 13 corresponding to the portion where the scan electrodes 6 are adjacent to each other is provided on the front substrate. A priming electrode 14 as a fourth electrode for generating a discharge between 1 and the back substrate 2 is formed in a direction orthogonal to the data electrode 9 to form a priming discharge space 30 as a second discharge space. The priming electrode 14 is formed on the dielectric layer 15 covering the data electrode 9, and the dielectric layer 16 is further formed so as to cover the priming electrode 14. Therefore, the priming electrode 14 is formed at a position closer to the gap portion 13 than the data electrode 9. With this configuration, priming discharge is performed between the auxiliary electrode 17 and the priming electrode 14 formed on the back substrate 2 side. Although the priming electrode 14 and the auxiliary electrode 17 are parallel to each other, it is preferable to form the priming electrode 14 and the auxiliary electrode 17 so that their center lines coincide with each other as shown by the line CC in FIG.

In the present embodiment, as shown in FIG. 1, in the priming discharge space 30 on the back substrate 2, the material layer 5 having a large secondary electron emission coefficient is substantially formed on the dielectric layer 16 covering the priming electrode 14. It is formed in a uniform film thickness. The material layer 5 includes an alkali metal oxide (eg, Cs ₂ O), an alkaline earth metal oxide (eg, MgO, CaO, SrO, BaO), or a fluoride (eg, LiF, CaF). ₂ , MgF _2, etc.) may be used. In this embodiment, there is a track record as a material of AC type PDP, and when encapsulating neon (Ne) and xenon (Xe) gas, the main component is MgO having a large secondary electron emission coefficient and excellent durability. The material layer 5 is formed by the material to be used. Therefore, the material layer 5 has a function of effectively emitting secondary electrons from the material layer 5 into the priming discharge space 30 when a voltage is applied between the priming electrode 14 and the auxiliary electrode 17. . As a result, in the present embodiment, secondary electrons can be uniformly supplied into the priming discharge space 30 from the material layer 5 formed continuously in the longitudinal direction of the priming discharge space 30. Therefore, variation in priming discharge in the priming discharge space 30 having an elongated shape can be suppressed, and uniform priming discharge can be generated in each main discharge space 11. Further, the generation of priming discharge can be promoted uniformly, and the voltage to be applied to priming discharge can be reduced.

  In the present embodiment, the priming electrode 14 is covered with the dielectric layer 16, but the material layer 5 is formed directly on the priming electrode 14 without providing the dielectric layer 16. You can also.

  Next, a method for displaying image data on the PDP will be described with reference to FIG.

  As a method of driving the PDP, one field period is divided into a plurality of subfields having a light emission period weight based on the binary system, and gradation display is performed by a combination of subfields to emit light. Each subfield includes an initialization period, an address period, and a sustain period.

FIG. 5 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 space (priming discharge space 30 in FIG. 1) in which the priming electrode Pr (priming electrode 14 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 auxiliary electrode (auxiliary electrode 17 in FIG. 1) and the priming electrode Pr. In the next address period, a positive potential is always applied to the priming electrode Pr. Therefore, in the priming discharge space, when the scanning pulse SP _n is applied to the scanning electrodes Y _n, priming discharge occurs between the priming electrode Pr and the auxiliary electrode.

Next, the scan pulse SP _{n + 1} is applied to the scan electrode Y _{n + 1} of the (n + 1) th discharge cell. At this time, since the priming discharge has occurred immediately before, the discharge delay at the address of the (n + 1) th discharge cell is small. Become. 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. 5, the above-described operation can be caused more reliably 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 address electrode D (data electrode 9 in FIG. 1).

  Thus, in the present embodiment, the priming discharge is generated in the vertical direction between the auxiliary electrode 17 provided on the front substrate 1 and the priming electrode 14 provided on the back substrate 2. In addition, the material layer 5 having a large secondary electron emission coefficient is formed in the priming discharge space 30 of the back substrate 2. Therefore, the electrons emitted from the auxiliary electrode 17 strike the material layer 5 on the back substrate 2 side, but since the material layer 5 is a material having a large secondary electron emission coefficient, secondary electrons are emitted from the material layer 5 to cause priming discharge. Secondary electrons can be supplied into the space 30 to uniformize the generation of priming discharge and promote the discharge. Therefore, it is possible to reduce the discharge intensity by reducing the discharge voltage while ensuring the same operation margin as in the prior art, and to suppress the influence of others on the priming discharge such as crosstalk, for example. In addition, when the discharge voltage is the same as that of the prior art, the discharge operation margin can be made larger than that of the prior art. Of course, the effect of suppressing the crosstalk and the effect of increasing the operating margin can be used together by adjusting the applied voltage. As a result, even in a high-definition PDP, the address characteristics can be further stabilized.

(Second Embodiment)
FIG. 6 is a cross-sectional view showing a PDP in the second embodiment of the present invention, and FIG. 7 is a cross-sectional view for explaining a discharge operation in the second embodiment of the present invention.

  Differences from the first embodiment shown in FIG. 1 will be described. In the first embodiment, the priming electrode 14 is provided in the priming discharge space 30 on the back substrate 2, and the priming discharge is formed between the priming electrode 14 and the auxiliary electrode 17 extended from the scanning electrode 6 in the address period. . In the second embodiment shown in FIG. 6, there is no priming electrode in the priming discharge space 30 on the back substrate 2, and there is no priming discharge between the auxiliary electrode 32 provided by extending the scanning electrode 6 and the data electrode 9. The discharge is performed during the initialization period. Therefore, the first embodiment is different from the first embodiment in that there is no priming electrode on the back substrate 2, and the other configurations are the same. The same is true for forming.

  FIG. 7 is a diagram for explaining the significance of generating a priming discharge between the data electrode 9 and the auxiliary electrode 32 in the initializing period, particularly in the first half of the initializing period. A form is demonstrated.

  As shown in FIG. 7, the discharge in the first half of the initialization period includes (1) discharge using the scan electrode 6 in the main discharge space 11 as an anode and the sustain electrode 7 as a cathode, and (2) discharge in the main discharge space 11. It is necessary to consider three discharges: discharge using the scan electrode 6 as an anode and the data electrode 9 as a cathode, and (3) discharge using the auxiliary electrode 32 in the priming discharge space 30 as an anode and the data electrode 9 as a cathode. In addition, in FIG. 7, each discharge of (1)-(3) is shown using the arrow which goes to the anode side from a cathode side. Since the purpose of the initialization discharge is to adjust the wall voltage in the main discharge space 11, it is sufficient that the discharges (1) and (2) can be stably generated. However, in the discharge (2), since the phosphor layer 33 having a small secondary electron emission coefficient serves as a cathode, the discharge hardly occurs and tends to be an unstable discharge. In the discharge (1), the protective layer 34 having a large secondary electron emission coefficient serves as a cathode. However, since the discharge is less likely to occur compared to the counter discharge, the partial pressure of xenon (Xe) is increased, for example. In some cases, the discharge may become unstable. However, in the discharge of (3), since the material layer 5 having a large secondary electron emission coefficient is a cathode and is a counter discharge, a very stable discharge can be generated.

  Therefore, by applying the voltage Vx to the data electrode 9, the discharge of (3) is generated before the discharge of (1) is generated, and the priming generated by the discharge of (3) is utilized. This is to generate a stable discharge. That is, in the first half of the initialization period, the data electrode 9 has the auxiliary electrode 32 in the priming discharge space 30 as an anode before the discharge in which the scanning electrode 6 in the main discharge space 11 serves as an anode and the sustain electrode 7 serves as a cathode. A voltage Vx for generating a discharge with the cathode as a cathode is applied to the data electrode 9. In addition, since the material layer 5 provided in the priming discharge space 30 reduces the discharge start voltage between the auxiliary electrode 32 and the data electrode 9, there is no possibility that the discharge of (2) occurs before the discharge of (3). .

  As described above, according to the second embodiment of the present invention, the initialization operation can be stably generated. For example, even in a PDP in which the xenon (Xe) partial pressure of the discharge gas is increased. The initialization discharge can be stabilized and an image can be displayed with good quality.

  As described above, according to the present invention, by stably generating priming discharge, it is possible to stabilize the initialization operation or the address operation even when the definition is increased or the xenon (Xe) partial pressure is increased. Since the image can be displayed with a high quality, it is useful for a plasma display device used for a wall-mounted television or a large monitor.

Sectional drawing which shows PDP in the 1st Embodiment of this invention The top view which shows typically the electrode arrangement | sequence by the side of the front substrate of the same PDP The perspective view which shows the back substrate side of the same PDP typically The top view which shows the back substrate side of the same PDP typically Waveform diagram showing an example of a drive waveform for driving the PDP Sectional drawing which shows PDP in the 2nd Embodiment of this invention Sectional drawing for demonstrating the discharge operation of the PDP

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Discharge space 4,15,16 Dielectric layer 5 Material layer 6 Scan electrode 6a, 7a Transparent electrode 6b, 7b Metal bus 7 Maintenance electrode 8 Light absorption layer 9 Data electrode 10 Partition 10a Vertical wall part 10b Horizontal wall portion 11 Main discharge space 12, 33 Phosphor layer 13, 30 Priming discharge space (gap portion)
14 Priming electrode 17, 32 Auxiliary electrode 34 Protective layer

Claims (4)

On the first substrate, an electrode group composed of the first electrode and the second electrode is formed so that the first electrodes are adjacent to each other and the second electrodes are adjacent to each other, and between the adjacent first electrodes, An auxiliary electrode connected to the first electrode is formed, and the second electrode is disposed on the second substrate opposed to the first substrate with a discharge space interposed therebetween, in the direction intersecting the first electrode and the second electrode. Forming three electrodes, forming a fourth electrode in a direction intersecting the third electrode via a dielectric layer between the third electrode and partitioning the discharge space, and at least the first discharge space and A partition wall forming a second discharge space is formed, wherein the first discharge space is a main discharge space that discharges with the first electrode, the second electrode, and the third electrode, and the second discharge space is the priming discharge spaces der performing discharge between the auxiliary electrode fourth electrode The discharge space side of the fourth electrode in the priming discharge space, oxides of alkali metals, plasma, characterized in that a material layer containing at least one of oxide, or fluoride of an alkaline earth metal Display panel. The plasma display panel according to claim 1 , wherein a dielectric layer is formed so as to cover the fourth electrode, and a material layer is provided on the dielectric layer . On the first substrate, an electrode group composed of the first electrode and the second electrode is formed so that the first electrodes are adjacent to each other and the second electrodes are adjacent to each other, and between the adjacent first electrodes, An auxiliary electrode connected to the first electrode is formed, and the second electrode is disposed on the second substrate opposed to the first substrate with a discharge space interposed therebetween, in the direction intersecting the first electrode and the second electrode. Forming three electrodes, and partitioning the discharge space to form at least a first discharge space and a second discharge space, wherein the first discharge space includes the first electrode, the second electrode, and the first electrode. A main discharge space in which discharge is performed with three electrodes, and the second discharge space is a priming discharge space in which discharge is performed with the auxiliary electrode and the third electrode, and in the priming discharge space on the second substrate side Alkali metal oxide, Al A plasma display panel, characterized in that a material layer containing at least one of Li earth metal oxides or fluorides. The plasma display panel according to any one of claims 1 to 3, wherein the material layer is made of a material mainly composed of MgO.

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