JP2004200035A - Plasma display panel - Google Patents

Abstract

An object of the present invention is to realize a plasma display panel having a structure capable of suppressing crosstalk between adjacent discharge cells and suppressing a decrease in exhaust conductance in an exhaust process.
A communication part having a discharge cell having a periphery partitioned by a partition, and a non-linear communication between the adjacent discharge cell and a part of a contact portion of the front plate with the partition. 20.
Although the discharge portion 17 can be evacuated by the communicating portion, the movement and diffusion of the prime effect particles that cause crosstalk are suppressed. Therefore, the exhaust conductance in the evacuation process is suppressed while suppressing the crosstalk. Can be secured.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display panel (hereinafter, referred to as a PDP) used for displaying images on computers and televisions.
[0002]
[Prior art]
FIG. 14 is a sectional perspective view showing a schematic structure of a conventional PDP. The front plate 2 of the PDP 1 has a display electrode 6 formed on one main surface of a front glass substrate 3 and including N scanning electrodes 4 and N sustaining electrodes 5, and a dielectric layer 7 covering the display electrode 6. And a protective layer 8 made of, for example, MgO that covers the dielectric layer 7. The scanning electrode 4 and the sustain electrode 5 have a structure in which bus electrodes 4b and 5b made of a metal material are stacked on the transparent electrodes 4a and 5a for the purpose of reducing electric resistance.
[0003]
The back plate 9 has M data electrodes 11 formed on one main surface of the back glass substrate 10, a dielectric layer 12 covering the data electrodes 11, and a portion between the data electrodes 11 on the dielectric layer 12. 13, a barrier 14 which is orthogonal to the partition 13 and whose height is, for example, about several tens of μm lower than the partition 13, and a phosphor layer on an inner wall in a region surrounded by the partition 13 and the barrier 14. 15.
[0004]
The front plate 2 and the back plate 9 oppose each other so that the display electrode 6 and the data electrode 11 are orthogonal to each other with the partition wall 13 interposed therebetween, and the periphery outside the image display area is sealed with a sealing member. In the discharge space 16 formed between the front plate 2 and the back plate 9, for example, a discharge gas of Ne-Xe 5% is sealed at a pressure of 66.5 kPa (500 Torr). Then, the intersection between the display electrode 6 and the data electrode 11 in the discharge space 16 operates as a discharge cell 17 (unit light emitting area).
[0005]
Here, since the discharge cells 17 have a structure surrounded by the partition walls 13 and the barriers 14, the discharge cells 17 may be affected by crosstalk between adjacent discharge cells 17 or fluctuations in the discharge start voltage due to the influence of priming. The occurrence of the problem can be suppressed, and at the same time, since the height of the barrier 14 is lower than that of the partition 13, a gap is formed between the barrier 14 and the front plate 2. In the exhaust process in the discharge space 16 performed before the sealing, the exhaust conductance is not reduced, and as a result, exhaust of impurity gas such as H ₂ O and CO ₂ in the PDP 1 which is considered to have an adverse effect on the discharge characteristics is prevented. It can be performed sufficiently (for example, see Patent Document 1).
[0006]
[Patent Document 1]
JP 2001-202876 A
[Problems to be solved by the invention]
However, even in the PDP having the above-described structure, there is a case where a problem of a reduction in a driving margin, which is considered to be caused by a change in wall voltage at the time of displaying an image, occurs. This is because the gap between the barrier 14 and the front plate 2 for communicating the discharge space 16 between the adjacent discharge cells 17 so as not to lower the exhaust conductance, and the discharge space 16 communicates linearly with the discharge space 16. Therefore, it is considered that the priming effect is caused by the residual charged particles and the like after the discharge move to the adjacent discharge space 16 through the gap.
[0008]
The present invention has been made in view of the above situation, and provides a plasma display panel having a structure capable of suppressing crosstalk between adjacent discharge cells and suppressing a decrease in exhaust conductance in an exhaust process. It is intended to be realized.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display panel according to the present invention is a plasma display panel having discharge cells whose periphery is partitioned by partition walls, wherein the front panel is adjacent to a part of a contact portion with the partition walls. The communication device includes a communication portion that communicates the discharge cells in a non-linear manner.
[0010]
In order to achieve the above object, a plasma display panel according to the present invention has a front plate and a back plate which are arranged to face each other, and the front plate has a display electrode composed of a scanning electrode and a sustain electrode. The face plate has a data electrode orthogonal to the display electrode, and a grid-like partition partitioning a plurality of discharge cells formed at a portion where the display electrode and the data electrode intersect. A communication part is provided at a part of the contact part for communicating the adjacent discharge cells in a non-linear manner.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the invention according to claim 1 of the present invention is a plasma display panel having discharge cells whose periphery is partitioned by partition walls, wherein a discharge adjoins a part of the front plate in contact with the partition walls. 9 is a plasma display panel including a communication unit that non-linearly communicates cells.
[0012]
Further, the invention according to claim 2 has a front plate and a rear plate that are arranged to face each other, the front plate has a display electrode composed of a scanning electrode and a sustain electrode, and the rear plate has a display electrode and a display electrode. Data electrodes that are orthogonal to each other, have a grid-shaped partition wall that partitions a plurality of discharge cells formed at a portion where the display electrode and the data electrode intersect, and a part of the front plate that is in contact with the partition wall. And a plasma display panel including a communication portion that non-linearly communicates adjacent discharge cells.
[0013]
According to a third aspect of the present invention, in the first or second aspect of the invention, the communication portion is provided on an opening surface of a groove provided on the front plate and having a width wider than the width of the top of the partition. It is configured such that the top is opposed to the contacted or inserted state.
[0014]
According to a fourth aspect of the present invention, in the third aspect, the width Wd (μm) of the groove and the width Wtr (μm) of the top of the partition wall facing the groove are 3 ≦ (Wd−Wtr). ) / 2 ≦ 17.
[0015]
According to a fifth aspect of the present invention, in the third aspect of the present invention, a second groove is provided at the top of the partition wall facing the groove.
[0016]
The invention according to claim 6 is the invention according to claim 5, wherein the width Wd (μm) of the groove is Wtr2 (μm), which is the total width of the tops of the partition walls facing the groove, and the second groove. Has a relationship of 3 ≦ (Wd−Wtr2−Wipg) / 2 ≦ 17 with respect to the width Wipg (μm) at the top of the partition wall.
[0017]
According to a seventh aspect of the present invention, in the third aspect, the distance D (μm) between the bottom surface of the groove and the top of the partition wall facing the groove has a relationship of 3 ≦ D ≦ 17. That is.
[0018]
Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to FIGS. The same components as those shown in FIG. 14 used in the description of the conventional PDP are denoted by the same reference numerals.
[0019]
(Embodiment 1)
FIG. 1 is a sectional perspective view showing a schematic structure of a PDP according to the first embodiment. FIG. 2 is a plan view showing the positional relationship between the display electrode 6, the grid-like partition wall 18, and the communication section 20 of the PDP according to the first embodiment, and FIG. 3 is an AA arrow in FIG. 2. FIG.
[0020]
The front panel 2 of the PDP 1 includes a transparent and insulating front panel 3 such as glass, a display electrode 6 including a scan electrode 4 and a sustain electrode 5, a dielectric layer 7 covering the display electrode 6, Further, a protective layer 8 made of, for example, an MgO film is provided to cover the dielectric layer 7. The scan electrode 4 and the sustain electrode 5 have a structure in which bus electrodes 4b and 5b made of a metal material are stacked on the transparent electrodes 4a and 5a for the purpose of reducing electric resistance and ensuring transparency.
[0021]
The back plate 9 includes a data electrode 11 orthogonal to the display electrode 6, a dielectric layer 12 covering the data electrode 11, and a dielectric layer 12 on an insulating rear glass substrate 10 such as glass. A plurality of discharge cells 17 (unit light-emitting regions) formed at portions where the display electrodes 6 and the data electrodes 11 intersect; a grid-shaped partition wall 18; and fluorescent light formed on the inner wall of the region surrounded by the partition wall 18. And a body layer 15.
[0022]
The front plate 2 and the rear plate 9 opposed to each other with the partition wall 18 interposed therebetween have a configuration in which the periphery outside the image display area is sealed with a sealing member, and the discharge space 16 includes, for example, Ne-Xe 5%. Is sealed at a pressure of 66.5 kPa (500 Torr).
[0023]
In the above configuration, the scanning electrode 4 (the number is given when the N-th line is indicated), the sustain electrode 5 (the number is indicated when the N-th line is indicated), and the data electrode 11 (the number is indicated when the N-th line is indicated). FIG. 4 schematically shows the relative positional relationship with the (numbered).
[0024]
Next, a driving method of the PDP will be described with reference to FIGS.
[0025]
FIG. 5 is a block diagram illustrating a schematic configuration of an image display device 100 using the PDP 1 of the present invention, and FIG. 6 is a diagram illustrating an example of a driving waveform applied to each electrode of the PDP 1 at that time.
[0026]
First, in an initializing period, an initializing pulse is applied to the scan electrodes 4 to initialize wall charges in the discharge cells 17 of the PDP 1.
[0027]
In the next write period, a scan pulse is simultaneously applied to the first scan electrode 4 (1), and a write pulse is simultaneously applied to a line of the data electrode 11 corresponding to the discharge cell 17 for performing display, thereby causing a write discharge. By doing so, wall charges are accumulated on the surface of the dielectric layer. Similarly, a scan pulse is simultaneously applied to the second scan electrode 4 (2), and a write pulse is simultaneously applied to a line of the data electrode 11 corresponding to the discharge cell 17 for performing display, thereby performing a write discharge. Wall charges are accumulated on the surface of the dielectric layer. By performing the above operation for all the scanning electrodes 4, the wall charges corresponding to the discharge cells 17 for displaying are sequentially accumulated on the surface of the dielectric layer, and the latent image for one screen is written.
[0028]
In the next sustain period, the data electrodes 11 are grounded and sustain pulses are alternately applied to the scan electrodes 4 and the sustain electrodes 5 in order to perform sustain discharge, whereby wall charges are accumulated on the surface of the dielectric layer. In the discharge cell 17 that has been discharged, that is, the discharge cell 17 selected by the write pulse, a discharge occurs when the potential of the surface of the dielectric layer exceeds the discharge start voltage, and the sustain pulse is applied (sustain period). , Main discharge is maintained.
[0029]
Then, in the subsequent erasing period, an incomplete discharge is generated by applying a narrow erasing pulse, and the wall charges disappear, so that erasing is performed.
[0030]
When displaying a television image, the image is composed of 60 fields per second in the NTSC system. Originally, in a plasma display panel, only two gradations of lighting or extinguishing can be expressed, so in order to display an intermediate color, the lighting time of each color of red (R), green (G), and blue (B) is time-divided. A method is used in which one field is divided into several subfields, and an intermediate color is expressed by a combination of the subfields. As an example of the division of the subfields in the case of expressing 256 gradations for each color in the PDP 1, as shown in FIG. 7, one field is divided into eight subfields, and the voltage is applied within the sustain period of each divided subfield. There is a method in which the ratio of the number of sustain pulses to be performed is weighted in binary such as 1, 2, 4, 8, 16, 32, 64, and 128, and 256 gradations are expressed by a combination of these 8 bits. Further, in order to further improve the image quality, the number of subfields is increased, and a plurality of combinations of subfield weights for displaying the gradation are used, so that a pseudo contour generated due to a movement of a line of sight during moving image display can be reduced. Reduction methods have also been used. As described above, in the driving method of the PDP 1, display is performed by a series of sequences including the initialization period, the writing period, the sustaining period, and the erasing period.
[0031]
Here, FIG. 8 is a cross-sectional view showing a schematic state of a contact portion between the dielectric layer 7 of the front plate 2 and the partition wall 18. In this figure, the protective layer 8 is omitted. For example, the front plate 2 includes a groove 19 having a width Wd larger than the width Wtr of the top of the partition 18 in a part of the dielectric layer 7 in contact with the lattice-shaped partition 18 of the back plate 9. The top surface of the partition wall 18 is in contact with the opening surface 19a (indicated by a dotted line in FIG. 8), that is, the surface at the same position as the inner surface 2a of the front panel 2, (FIG. 8A), or inserted. By facing each other in the state (FIG. 8B), a communication section 20 that non-linearly connects the adjacent discharge cells 17 via the partition wall 18 is formed. Here, the term “non-linearly communicating” means a structure that does not communicate linearly, that is, a structure in which (discharge spaces 16 of) the adjacent discharge cells 17 via the partition wall 18 cannot be directly viewed. Is what you do. In addition, for such a purpose, the top of the partition wall 18 is in a state of being inserted more than the opening surface 19 a of the groove 19 including the same surface.
[0032]
With this structure, the priming effect particles such as metastable particles remaining in the discharge cells 17 after the discharge are prevented from moving and diffusing to the adjacent discharge cells 17 and problems such as crosstalk between the adjacent discharge cells 17 are prevented. Can be obtained.
[0033]
In addition, due to the presence of the communication portion 20, the exhaust conductance does not decrease in the exhaust process in the discharge space 16 performed before the discharge gas is filled in the manufacturing process of the PDP 1, and as a result, the maximum ultimate vacuum degree in the exhaust process is reduced. An effect is obtained that is substantially the same as that of the conventional PDP, that is, it is possible to sufficiently exhaust the impurity gas which is considered to have a bad influence on the discharge characteristics such as H ₂ O and CO ₂ in the PDP 1.
[0034]
FIG. 9 shows the relationship between the distance between adjacent discharge cells (IPG) and the driving margin between the PDP according to the first embodiment and the conventional PDP. In the figure, the broken line shown in (a) is the relationship in the PDP of the present embodiment, and the solid line shown in (b) is the relationship in the conventional PDP. From this figure, it can be seen that in the PDP according to the first embodiment, when the IPGs are equal, the start voltage (generated voltage) of erroneous discharge due to crosstalk is high, and the drive margin is wide. As described above, since a drive margin can be secured even in a narrower IPG than in a conventional PDP, the electrode width can be increased, and as a result, the luminance can be improved. That is, the crosstalk margin can be improved without lowering the luminance, and the light emission efficiency can be improved.
[0035]
FIG. 10 shows the relationship between the distance De (μm) between the dielectric layer 7 of the front plate 2 and the partition 18 at the groove 19 in the communication portion 20 and the decrease value ΔVw (V) of the wall voltage. This is the result of experiments performed on different IPGs when the Xe gas contained in the discharge gas was 5% and 15%. As can be seen from this figure, the reason why the drop value ΔVw (V) of the wall charge becomes an allowable range, for example, about 2 (V) or less, is that De (μm) is about 17 (μm) even under various conditions. It turns out that it becomes as follows. When De is 0 (μm), exhaust is insufficient, so that a certain gap is required, which is about 3 (μm) or more.
[0036]
From this, if the width of the groove 19 is Wd (μm) and the width of the top of the partition wall 18 facing the groove 19 is Wtr (μm), (Wd−Wtr) / 2 = De, so that 3 ≦ ( When the relationship of (Wd−Wtr) / 2 ≦ 17 is satisfied, a decrease in wall voltage during a write operation is reduced, and a crosstalk margin can be improved. It is considered that this is because a reduction in wall charges due to the priming effect is suppressed by an effect of suppressing priming effect particles such as metastable particles remaining after discharge from diffusing to the adjacent discharge cells 17. In addition, it is considered that this increases the driving margin.
[0037]
For the same reason, if the distance between the bottom surface of the groove 19 and the top of the partition wall 18 facing the groove 19 is D (μm), D = De, so that the relation of 3 ≦ D ≦ 17 is satisfied. Is preferred.
[0038]
(Embodiment 2)
FIG. 11 is a plan view showing a positional relationship between the display electrode 6, the grid-like partition 18, and the communication portion 20 of the PDP according to the second embodiment, and FIG. 12 is a cross-sectional view taken along the line AA in FIG. 11. FIG. The difference from the first embodiment is that the partition wall 18 has a second groove 21 at the top.
[0039]
As a result, the volume of the communication portion 20 that non-linearly communicates with the adjacent discharge cell 17 via the partition wall 18 increases, so that priming effect particles such as metastable particles move and diffuse through the communication portion 20. The effect of suppressing this can be further enhanced.
[0040]
Here, the sum Wtr2 of the widths of the top portions of the partition walls 18 indicates the sum of the widths of the respective portions in the case of the portions separated by the second groove portions 21. The depth of the second groove 21 from the top of the partition wall 18 is not particularly limited, and may be any depth as long as the effect of suppressing movement and diffusion of the priming effect particles can be obtained. It does not matter. Also, the formation method is such that the gap is formed by removing by etching or the partition 18 is divided into two with a gap therebetween, so that the gap between the two becomes the second groove 21. It does not matter.
[0041]
FIG. 13 shows the relationship between the distance between adjacent discharge cells (IPG) and the driving margin of the PDP according to the second embodiment and the PDP according to the first embodiment. In the drawing, the dashed line shown in (a) is the relationship in the PDP according to the second embodiment, and the solid line shown in (b) is the relationship in the PDP according to the first embodiment. From this figure, it can be seen that the PDP according to the second embodiment has a higher erroneous discharge start voltage (generated voltage) due to crosstalk than the PDP according to the first embodiment, and has a wider drive margin. Understand. As described above, according to the present embodiment, since a drive margin can be secured up to a narrow IPG, the electrode width can be increased, and as a result, the luminance can be improved. That is, the crosstalk margin can be improved without lowering the luminance, and the light emission efficiency can be improved.
[0042]
Further, from the relationship between the distance De (μm) between the dielectric layer 7 of the front panel 2 and the partition 18 at the groove 19 in the communication portion 20 and the decrease value ΔVw (V) of the wall voltage shown in FIG. Similarly, when the width of the groove 19 is Wd (μm), the sum of the widths of the tops of the partition walls 18 facing the groove 19 is Wtr2 (μm), and the width of the second groove 21 at the top of the partition is Wipg (μm). , (Wd−Wtr2−Wipg) / 2 = De (μm), it is desirable to have a relationship of 3 ≦ (Wd−Wtr2−Wipg) / 2 ≦ 17.
[0043]
Similarly, assuming that the distance between the bottom surface of the groove and the top of the partition wall facing the groove is D (μm), since D = De, it is preferable to have a relationship of 3 ≦ D ≦ 17.
[0044]
In the configuration according to the first and second embodiments described above, the groove 19 of the front plate 2 that forms the communication portion 20 is due to a part of the dielectric layer 7 being recessed. The present invention is not limited to the structure. For example, the effect of the present invention can be similarly obtained even when the groove 19 is formed by removing all of the dielectric layer 7.
[0045]
In addition, the groove portion 19 has a continuous form in one direction of the partition wall 18, but is not limited to such a form, and is formed discretely and according to portions of the partition wall 18 in different directions. However, the effects of the present invention can be similarly obtained.
[0046]
Further, the partition 18 is not limited to the lattice shape, and the effect of the present invention can be similarly obtained with respect to the shape that partitions the periphery of the discharge cell 17.
[0047]
【The invention's effect】
As described above, according to the present invention, it is possible to realize a plasma display panel having a structure capable of suppressing crosstalk between adjacent discharge cells and suppressing a decrease in exhaust conductance in an exhaust process.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view showing a schematic configuration of a plasma display panel according to a first embodiment of the present invention. FIG. 2 is a diagram showing a display electrode, a grid-like partition, and a communicating portion of the plasma display panel according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. 4 is a sectional view of the plasma display panel according to the first embodiment of the present invention. FIG. 5 is a block diagram showing a schematic configuration of an image display apparatus using the plasma display panel according to the first embodiment of the present invention. FIG. 6 is a plasma display according to the first embodiment of the present invention. FIG. 7 is a diagram showing an example of a driving waveform applied to each electrode of the panel. FIG. 8 is a diagram showing an example of subfield division when expressing 256 gray scales. FIG. 9 is a view showing the relationship between the distance between adjacent discharge cells and the driving margin of the plasma display panel according to the first embodiment. FIG. 10 is a view showing the groove in the communicating portion of the plasma display panel according to the first embodiment. FIG. 11 is a diagram showing the relationship between the distance De between the dielectric layer of the front panel and the partition and the reduction value ΔVw of the wall voltage. FIG. 11 shows a display electrode and a grid-like structure of the plasma display panel according to the second embodiment of the present invention. FIG. 12 is a plan view showing the positional relationship between the partition wall and the communicating portion. FIG. 12 is a cross-sectional view taken along the line AA in FIG. 11. FIG. 13 is an adjacent discharge of the plasma display panel according to the second embodiment of the present invention. FIG. 14 is a diagram showing the relationship between the inter-cell distance and the drive margin. FIG. 14 is a cross-sectional perspective view showing a schematic configuration of a conventional plasma display panel.
DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Front plate 3 Front glass substrate 7 Dielectric layer 8 Protective layer 9 Back plate 10 Back glass substrate 12 Dielectric layer 17 Discharge cell 18 Partition wall 20 Communication part

Claims (7)

What is claimed is: 1. A plasma display panel having discharge cells whose periphery is partitioned by partition walls, the plasma display panel comprising a communication portion for communicating the adjacent discharge cells non-linearly in a part of the front plate in contact with the partition walls. panel. It has a front plate and a back plate that are arranged to face each other. A plurality of discharge cells formed in a portion where the discharge cells intersect with each other, and a plurality of discharge cells are formed. Plasma display panel provided with a communication part that communicates. 3. The communication part according to claim 1, wherein the top of the partition is in contact with or inserted into an opening surface of a groove provided on the front plate and having a width larger than the width of the top of the partition. The plasma display panel according to item 1. 4. The plasma display panel according to claim 3, wherein the width Wd (μm) of the groove and the width Wtr (μm) of the top of the partition wall facing the groove have a relationship of 3 ≦ (Wd−Wtr) / 2 ≦ 17. The plasma display panel according to claim 3, further comprising a second groove at a top of the partition wall facing the groove. The width Wd (μm) of the groove is 3 ≦ (Wd−Wtr2) with respect to the total width Wtr2 (μm) of the top of the partition wall facing the groove and the width Wipg (μm) of the second groove at the top of the partition wall. The plasma display panel according to claim 5, wherein a relationship of -Wipg) / 2≤17 is satisfied. 4. The plasma display panel according to claim 3, wherein a distance D (μm) between a bottom surface of the groove and a top of the partition wall facing the groove has a relationship of 3 ≦ D ≦ 17.

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