JP5114817B2 - Plasma display panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improving the image quality of a plasma display panel used for image display of a computer, a television or the like and an image display apparatus using the same.
[0002]
[Prior art]
FIG. 5 shows a perspective sectional view of a main part of a typical panel configuration of a plasma display panel using fine electrodes. FIG. 6 is a cross-sectional view taken along the line B-Ba in FIG. 5 and shows a schematic diagram of address discharge. The panel using the divided fine electrode group is a technique disclosed in JP-A-3-187125. FIG. 7 shows a typical driving waveform for driving the AC type plasma display panel.
[0003]
As shown in FIG. 5, a conventional plasma display panel (hereinafter referred to as a panel) 1 using fine electrodes is arranged with a glass front substrate 3 and a glass rear substrate 4 facing each other across a discharge space 2. Has been. On the surface substrate 3, scan electrodes 7 and sustain electrodes 8, which are formed of a pair of band-shaped fine electrodes covered with the dielectric layer 5 and the protective film 6, are arranged in parallel to each other.
[0004]
On the back substrate 4, strip-shaped data electrodes 9 are arranged in parallel to each other in a direction orthogonal to the scan electrodes 7 and the sustain electrodes 8, and each data electrode 9 is isolated and the discharge space 2 is formed. A strip-shaped partition wall 10 is provided between the data electrodes 9. A phosphor layer 11 is formed from the data electrode 9 to the side surface of the barrier rib 10. Further, the discharge space 2 is filled with a mixed gas of at least one of helium (He), neon (Ne), and argon (Ar) and xenon (Xe).
[0005]
This panel 1 is configured to view an image display from the surface substrate 3 side, and excites the phosphor layer 11 by ultraviolet rays generated by the discharge between the scan electrode 7 and the sustain electrode 8 in the discharge space 2. The visible light from the phosphor layer 11 is used for display light emission.
[0006]
The conventional panel has a panel configuration as shown in FIG. 8, in which the scanning electrode 7 and the sustaining electrode 8 are arranged in order for each scanning line (hereinafter referred to as ABAB arrangement), except for the discharge gap Xg which is a display unit. The scan electrode 7 and the sustain electrode 8 are adjacent to each other between certain display lines. For this reason, an electric field is generated between adjacent cells, and an unintended discharge is likely to occur between adjacent cells, and in order to prevent this, a certain appropriate cell interval is necessary. This was a big issue.
[0007]
Therefore, recently, the scanning electrode 7 and the sustaining electrode 8 are arranged so that the arrangement relationship with respect to the discharge gap Xg is alternately changed for each display line, thereby forming an electrode configuration (hereinafter referred to as an ABBA arrangement). In the sustain period, a potential difference is generated only in the discharge gap Xg, and all adjacent electrodes other than the discharge gap Xg are set to the same potential to prevent the occurrence of erroneous discharge between adjacent cells.
[0008]
In addition, since the number of electrode lines increases with higher definition, when the panel is driven, reactive power due to charging / discharging of the parasitic capacitance of the panel becomes so large that it cannot be ignored, but this ABBA arrangement electrode configuration should be used. Therefore, since the adjacent electrodes other than the discharge gap Xg have the same potential in the sustain period, the parasitic capacitance C of the panel is reduced, and there is a great effect that the reactive power when the panel is driven is reduced.
[0009]
[Problems to be solved by the invention]
However, the problem of charge loss arises with higher definition. The following explains the phenomenon of charge loss.
[0010]
The conventional panel is driven by applying the voltage waveform shown in FIG. 7 to each electrode. Specifically, first, a large voltage having a gentle gradient is applied during the initialization period, and appropriate wall charges are applied below the scan electrode 7 and the sustain electrode 8 so that the scan electrode 7 and the sustain electrode 8 start to discharge between the discharge gaps. Accumulate in the dielectric layer. Next, a pulse voltage is applied to the data electrode in the cell to be discharged to cause the discharge, and the discharge is maintained in the subsequent sustain period. In addition, since a pulse voltage to the data electrode is not applied to a cell that is not discharged, the principle is that discharge is not performed.
[0011]
Here, the above-mentioned charge loss is a phenomenon of discharge failure in the writing period without adjacent cell pitch becoming narrower due to high definition and mutual interference of charges between adjacent cells, and proper control of wall charges cannot be performed. This is a problem that mainly causes a defect such as a so-called non-lighting in which a cell that originally discharges does not discharge, or a bright spot that discharges a cell that has not been written sometimes.
[0012]
Originally, the wall charges of the scan electrode 7 and the sustain electrode 8 must be adjusted close to the discharge start voltage until immediately before the write discharge, but this wall charge control becomes very difficult when the pixel interval is less than a certain pixel interval. This charge interference is thought to be mainly caused by electrons having a higher mobility than ions.
[0013]
Of course, this also occurs in an ABAB-arranged electrode, but there is a tendency to appear more prominently in an ABBA-arranged electrode. Perform the described using FIG its cause.
[0014]
FIG. 6 is a cross-sectional view of the discharge cell in the direction of the data electrode, and shows the movement of electrons at the moment when the cell of the display line n has performed a write discharge. As shown in FIG. 6 , the write discharge progresses from the scan electrode 7 to the sustain electrode 8 with the discharge between the scan electrode 7 and the data electrode 9 as a trigger. At this time, if the electrode arrangement is an ABBA arrangement, the sustain electrode 8 of the display line n where the write discharge progresses and the sustain electrode 8 of the display line n + 1, which is an adjacent electrode, have the same potential. When the cell pitch is narrowed, electrons as charged particles also affect the sustain electrode 8 of the display line n + 1 where the next generation occurs, and the wall charges accumulated in the sustain electrode 8 of the display line n + 1 before the write discharge are reduced. . For this reason, the wall space adjusted to be close to the discharge start voltage is not present in the discharge space of the display line n + 1, so that a discharge failure occurs during the write discharge, and the cell becomes unlit.
[0015]
This phenomenon of charge loss occurs due to wall charges under the sustain electrode 8 that do not adjust wall charges with a larger voltage than the scan electrode 7 that applies a large voltage during the initialization period and completely adjusts the wall charges. Cheap.
[0016]
In addition, the number of times of initialization performed with a large voltage is conventionally performed for each subfield, but the frequency of resetting wall charges decreases when a driving method that reduces the number of times of initialization to apply a large voltage is reduced. Of course, the charge loss becomes more prominent.
[0017]
In order to further increase the definition, it is indispensable to reduce the pixel pitch at present.
[0018]
[Means for Solving the Problems]
In order to solve this problem, the plasma display panel using the microelectrode group of the present invention has an asymmetric electrode structure between the scan electrode and the sustain electrode in the charge discharge phenomenon during address discharge, and increases the luminous efficiency while addressing. A stable discharge can be realized by preventing the charge loss phenomenon during the discharge.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
(Embodiment 1)
The electrode configuration of Embodiment 1 of the present invention is shown in FIG. FIG. 1 is a view seen from a direction perpendicular to the panel substrate.
[0021]
FIG. 2 shows a cross-sectional view of the cell during write discharge when this panel is discharged by the conventional driving method shown in FIG.
[0022]
In the conventional widely used driving method, the scanning electrode is a cathode and the sustaining electrode is an anode at the time of writing discharge. Therefore, electrons generated by the write discharge diffuse from the scan electrode to the sustain electrode as shown in FIG. Previously, as shown in FIG. 6, this diffusion occurs beyond the sustain electrode to the adjacent cell, and thus the above-described charge loss phenomenon occurs.
[0023]
Accordingly, in the present invention, as shown in FIG. 1, the sustain electrode serving as the anode of the write discharge is arranged so that the sustain electrode is biased away from the discharge gap, thereby suppressing the spread of the write discharge, and the write discharge only in the vicinity of the discharge gap. This prevents the phenomenon of charge loss. This is a technique that is possible because the electrodes are composed of discrete fine electrode groups. In the case of electrodes having a structure consisting of fine electrode groups, it is necessary to take a long time to advance the discharge compared to a continuous electrode structure. Therefore, it is possible to very effectively suppress the charge loss phenomenon during the address discharge.
[0024]
The important point here is that it is possible to suppress the spread of the write discharge by adopting an electrode structure in which both the scan electrode and the sustain electrode are close to the discharge gap, but it is also possible to suppress the spread of all discharges during the sustain discharge. Therefore, there arises a problem that the brightness of the panel is lowered. However, the present invention solves this problem by using an asymmetric electrode configuration between the scan electrode and the sustain electrode. In other words, the sustain electrode has a structure that suppresses the spread of the write discharge, suppresses the discharge to a small extent, and in the sustain discharge of the main light emission of the panel, in order to achieve high brightness on the scan electrode side, the electrode interval is widened to spread the discharge. Use an electrode configuration that helps. As a result, it is possible to effectively prevent only the charge loss in the write discharge while minimizing the decrease in luminance.
[0025]
At this time, in the sustain discharge of this panel, a voltage pulse is alternately applied to the scan electrode and the sustain electrode, and wall charges are alternately accumulated on the surface of the dielectric layer, and the discharge is performed using the so-called AC discharge. Therefore, more stable driving can be realized if the wall charge amount alternately accumulated in the scan electrode and the sustain discharge is the target.
[0026]
Therefore, while the asymmetric electrode structure that suppresses the charge loss phenomenon, the fine electrode group is more preferably an electrode structure in which the wall charge amount is as symmetrical as possible between the scan electrode and the sustain electrode. Therefore, there are mainly two means in FIG. 1. First, the total electrode area of the scan electrode and the sustain electrode is made equal (S1 + S2 + S3 = T1 + T2 + T3), and secondly, each of the scan electrode and the sustain electrode. In the present invention, the equivalent electrode width, which is the distance from the discharge gap of the electrode group to the outermost side of the fine electrode group, is made equal (W1 = W2). Furthermore, it is more preferable in terms of driving stability that the scan electrode and the sustain electrode have the same electrode structure and equivalent electrode width.
[0027]
In addition, the suppression effect of the charge loss phenomenon in the present invention is a more effective means in a panel having a structure in which electrodes are repeatedly arranged in the order of the scan electrode, the sustain electrode, the sustain electrode, and the scan electrode as described in the above problem. .
[0028]
In the first embodiment, the number of electrodes is three as an example, but the present invention is not limited to this.
[0029]
In addition, since a panel having a structure using a fine electrode group has a feature of having a very high light emission intensity under the fine electrode, the light emission can be achieved by forming the electrode of the present invention with a fine electrode of a transparent electrode. The panel can be efficiently taken out on the entire panel without being shielded by the electrodes, and a high-luminance panel can be realized.
[0030]
In addition, this effect is most effective in increasing the brightness when the electrode closest to the discharge gap is a transparent electrode.
[0031]
Moreover, since it is difficult to reduce the line resistance value of the electrode with only the transparent electrode, it is difficult to increase the size of the panel. In order to reduce the line resistance, an electrode mainly composed of low resistance silver or chromium / copper / By forming a part or all of the fine electrodes with thin film metal electrodes such as thin film metal such as chromium, it is possible to reduce voltage drop due to the line resistance of the electrodes when the panel is enlarged, and this is applied to cause discharge. The required voltage can be substantially reduced.
[0032]
Moreover, a panel having a low resistance and a high luminance can be realized by configuring a panel with a fine electrode group having a composite configuration of an electrode made of the transparent electrode and an electrode made of a low-resistance metal electrode.
[0033]
Furthermore, in the panel using the fine electrode, there is a problem in producing the panel that the electric field is likely to be concentrated on the edge portion of the fine electrode and the dielectric breakdown voltage is liable to be increased due to the increase in the number of electrode edges. By realizing the thin film of the electrode with chromium or the like, the withstand voltage of the dielectric formed thereon can be improved, and the yield of panel production can be improved.
[0034]
Further, when using a driving method in which the scan electrode serves as an anode during writing discharge and the sustain electrode serves as a cathode, the same effect as that of the present invention can be obtained by adopting a structure in which the scan electrode and the sustain electrode are reversed.
[0035]
In addition, at least the panel of the present invention, a display electrode drive circuit connected to each of a plurality of pairs of scan electrodes and sustain electrodes for driving the panel, and a control unit for controlling the display electrode drive circuit are provided. Thus, it is possible to realize an image display device that suppresses the charge loss phenomenon and improves the image quality.
[0036]
(Embodiment 2)
FIG. 3 shows an electrode configuration according to the second embodiment of the present invention. FIG. 3 is a view as seen from a direction perpendicular to the panel substrate.
[0037]
As shown in FIG. 3, by adopting an asymmetric electrode configuration in which the number of sustain electrodes that become anodes during write discharge is smaller than the number of scan electrodes, discharge to the anode electrode side of write discharge is performed in the same manner as in the first embodiment. High brightness in the sustain discharge can be realized while suppressing the spread.
[0038]
At this time, in the sustain discharge of this panel, a voltage pulse is alternately applied to the scan electrode and the sustain electrode, and wall charges are alternately accumulated on the surface of the dielectric layer, and the discharge is performed using the so-called AC discharge. Therefore, more stable driving can be realized if the wall charge amount alternately accumulated in the scan electrode and the sustain discharge is the target.
[0039]
Therefore, while the asymmetric electrode structure that suppresses the charge loss phenomenon, the fine electrode group is more preferably an electrode structure in which the wall charge amount is as symmetrical as possible between the scan electrode and the sustain electrode. In FIG. 3, there are roughly two means as the means. First, the total electrode area of the scan electrode and the sustain electrode is made equal (S1 + S2 + S3 = T1 + T2), and second, each electrode of the scan electrode and the sustain electrode The equivalent electrode width, which is the distance from the discharge gap of the group to the outermost side of the fine electrode group, may be made equal (W1 = W2). Furthermore, it is more preferable in terms of driving stability that the scan electrode and the sustain electrode have the same electrode structure and equivalent electrode width.
[0040]
In addition, the suppression effect of the charge loss phenomenon in the present invention is a more effective means in a panel having a structure in which electrodes are repeatedly arranged in the order of the scan electrode, the sustain electrode, the sustain electrode, and the scan electrode as described in the above problem. .
[0041]
In the second embodiment, the case where the number of electrodes is 2 and 3 is taken as an example, but the present invention is not limited to this.
[0042]
In addition, since a panel having a structure using a fine electrode group has a feature of having a very high light emission intensity under the fine electrode, the light emission can be achieved by forming the electrode of the present invention with a fine electrode of a transparent electrode. The panel can be efficiently taken out on the entire panel without being shielded by the electrodes, and a high-luminance panel can be realized.
[0043]
In addition, this effect is most effective in increasing the brightness when the electrode closest to the discharge gap is a transparent electrode.
[0044]
Moreover, since it is difficult to reduce the line resistance value of the electrode with only the transparent electrode, it is difficult to increase the size of the panel. In order to reduce the line resistance, an electrode mainly composed of low resistance silver or chromium / copper / By forming a part or all of the fine electrodes with thin film metal electrodes such as thin film metal such as chromium, it is possible to reduce voltage drop due to the line resistance of the electrodes when the panel is enlarged, and this is applied to cause discharge. The required voltage can be substantially reduced.
[0045]
Moreover, a panel having a low resistance and a high luminance can be realized by configuring a panel with a fine electrode group having a composite configuration of an electrode made of the transparent electrode and an electrode made of a low-resistance metal electrode.
[0046]
Furthermore, in the panel using the fine electrode, there is a problem in producing the panel that the electric field is likely to be concentrated on the edge portion of the fine electrode and the dielectric breakdown voltage is liable to be increased due to the increase in the number of electrode edges. By realizing the thin film of the electrode with chromium or the like, the withstand voltage of the dielectric formed thereon can be improved, and the yield of panel production can be improved.
[0047]
Further, when using a driving method in which the scan electrode serves as an anode during writing discharge and the sustain electrode serves as a cathode, the same effect as that of the present invention can be obtained by adopting a structure in which the scan electrode and the sustain electrode are reversed.
[0048]
In addition, at least the panel of the present invention, a display electrode drive circuit connected to each of a plurality of pairs of scan electrodes and sustain electrodes for driving the panel, and a control unit for controlling the display electrode drive circuit are provided. Thus, it is possible to realize an image display device that suppresses the charge loss phenomenon and improves the image quality.
[0049]
(Embodiment 3)
FIG. 4 shows an electrode configuration according to Embodiment 3 of the present invention. FIG. 4 is a view as seen from a direction perpendicular to the panel substrate.
[0050]
As shown in FIG. 4, the write discharge is the same as in the first and second embodiments by adopting an asymmetric electrode configuration in which the electrode width from the most discharge gap of the sustain electrode that becomes the anode at the time of write discharge is wider than the other electrode widths. High brightness in the sustain discharge can be realized while suppressing the spread of the discharge to the anode side.
[0051]
At this time, in the sustain discharge of this panel, a voltage pulse is alternately applied to the scan electrode and the sustain electrode, and wall charges are alternately accumulated on the surface of the dielectric layer, and the discharge is performed using the so-called AC discharge. Therefore, more stable driving can be realized if the wall charge amount alternately accumulated in the scan electrode and the sustain discharge is the target.
[0052]
Therefore, while the asymmetric electrode structure that suppresses the charge loss phenomenon, the fine electrode group is more preferably an electrode structure in which the wall charge amount is as symmetrical as possible between the scan electrode and the sustain electrode. Therefore, there are mainly two means in FIG. 1. First, the total electrode area of the scan electrode and the sustain electrode is made equal (S1 + S2 + S3 = T1 + T2 + T3), and secondly, each of the scan electrode and the sustain electrode. In the present invention, the equivalent electrode width, which is the distance from the discharge gap of the electrode group to the outermost side of the fine electrode group, is made equal (W1 = W2). Furthermore, it is more preferable in terms of driving stability that the scan electrode and the sustain electrode have the same electrode structure and equivalent electrode width.
[0053]
In addition, the suppression effect of the charge loss phenomenon in the present invention is a more effective means in a panel having a structure in which electrodes are repeatedly arranged in the order of the scan electrode, the sustain electrode, the sustain electrode, and the scan electrode as described in the above problem. .
[0054]
In the third embodiment, the number of electrodes is three as an example, but the present invention is not limited to this.
[0055]
In addition, since a panel having a structure using a fine electrode group has a feature of having a very high light emission intensity under the fine electrode, the light emission can be achieved by forming the electrode of the present invention with a fine electrode of a transparent electrode. The panel can be efficiently taken out on the entire panel without being shielded by the electrodes, and a high-luminance panel can be realized.
[0056]
In addition, this effect is most effective in increasing the brightness when the electrode closest to the discharge gap is a transparent electrode.
[0057]
Moreover, since it is difficult to reduce the line resistance value of the electrode with only the transparent electrode, it is difficult to increase the size of the panel. In order to reduce the line resistance, an electrode mainly composed of low resistance silver or chromium / copper / By forming a part or all of the fine electrodes with thin film metal electrodes such as thin film metal such as chromium, it is possible to reduce voltage drop due to the line resistance of the electrodes when the panel is enlarged, and this is applied to cause discharge. The required voltage can be substantially reduced.
[0058]
Moreover, a panel having a low resistance and a high luminance can be realized by configuring a panel with a fine electrode group having a composite configuration of an electrode made of the transparent electrode and an electrode made of a low-resistance metal electrode.
[0059]
Furthermore, in the panel using the fine electrode, there is a problem in producing the panel that the electric field is likely to be concentrated on the edge portion of the fine electrode and the dielectric breakdown voltage is liable to be increased due to the increase in the number of electrode edges. By realizing the thin film of the electrode with chromium or the like, the withstand voltage of the dielectric formed thereon can be improved, and the yield of panel production can be improved.
[0060]
Further, when using a driving method in which the scan electrode serves as an anode during writing discharge and the sustain electrode serves as a cathode, the same effect as that of the present invention can be obtained by adopting a structure in which the scan electrode and the sustain electrode are reversed.
[0061]
In addition, at least the panel of the present invention, a display electrode drive circuit connected to each of a plurality of pairs of scan electrodes and sustain electrodes for driving the panel, and a control unit for controlling the display electrode drive circuit are provided. Thus, it is possible to realize an image display device that suppresses the charge loss phenomenon and improves the image quality.
[0062]
In the above-described embodiment of the present invention, the fine electrode group has an asymmetric electrode configuration of the scan electrode and the sustain electrode, and the electrode configuration in which the electrode side serving as the anode during write discharge is biased from the discharge gap is reduced. Although the electrode configuration and the fine electrode width from the discharge gap were each made wider than the other electrode widths, of course, the combination of these electrode configurations can more effectively suppress the charge loss phenomenon and Brightness can also be realized.
[0063]
【Effect of the invention】
As described above, the present invention is a plasma display panel having at least a pair of scan electrodes and sustain electrodes, wherein the scan electrodes and sustain electrodes are each composed of a fine electrode group, and the scan electrodes and sustain electrodes are asymmetric. A plasma display panel having an electrode configuration can provide a high-luminance plasma display panel while suppressing stable interference and suppressing charge interference between adjacent cells during write discharge.
[Brief description of the drawings]
FIG. 1 is a diagram showing an electrode configuration of a microelectrode according to a first embodiment of the present invention. FIG. 2 is a schematic diagram of an address discharge in the first embodiment of the present invention. FIG. 4 is a diagram showing an electrode configuration of a fine electrode according to Embodiment 3 of the present invention. FIG. 5 is a perspective view of a main part of a conventional panel. FIG. 6 is a cross-sectional view taken along line B-Ba in FIG. Figure and schematic diagram of address discharge [Fig. 7] Fig. 8 is a diagram showing typical driving waveforms of a conventional panel. [Fig.
DESCRIPTION OF SYMBOLS 1 Panel 2 Discharge space 3 Front substrate 4 Back substrate 5 Dielectric layer 6 Protective film 7 Scan electrode 8 Sustain electrode 9 Data electrode 10 Partition 11 Phosphor layer

Claims (13)

A plasma display panel having at least a scan electrode and a sustain electrode paired in a discharge cell, wherein the scan electrode is composed of a group of microelectrodes composed of a plurality of discrete microelectrodes adjacent to each other, In the discharge cell, the sustain electrode is composed of a group of microelectrodes composed of a plurality of discretely adjacent microelectrodes, and the microelectrode group of the scan electrode and the microelectrode group of the sustain electrode are separated from each other. The plasma display panel is characterized in that the arrangement of the fine electrode groups is different between the scan electrode and the sustain electrode. 2. The scan electrode and the sustain electrode are each formed of a group of fine electrodes that are linearly extending in the longitudinal direction of the electrode and divided in a direction perpendicular to the longitudinal direction. Plasma display panel. At least the electrode interval between the fine electrodes on the side closer to the discharge gap than the discharge gap in the electrode serving as an anode during address discharge of the scan electrode or the sustain electrode. 3. The plasma display panel according to claim 2, wherein the plasma display panel has a narrower electrode structure. The plasma display panel according to claim 1, wherein the number of the fine electrodes is different between the scan electrode and the sustain electrode. 5. The plasma display panel according to claim 4, wherein, in the scan electrode or the sustain electrode, the number of the fine electrodes is smaller in the electrode serving as the anode during the address discharge than in the electrode serving as the cathode during the address discharge. . 3. The plasma display panel according to claim 2, wherein a width of the fine electrode closest to a discharge gap of an electrode serving as an anode at the time of address discharge of the scan electrode or the sustain electrode is made larger than that of the other fine electrode. . 7. The plasma display panel according to claim 1 , wherein a scan electrode, a sustain electrode, a sustain electrode, and a scan electrode are repeatedly arranged in this order. 8. The plasma display panel according to claim 1, wherein a total area of the fine electrode group in the discharge cell is equal between the scan electrode and the sustain electrode. 8. The plasma display panel according to claim 1, wherein an equivalent electrode width of the fine electrode group in the discharge cell is equal between the scan electrode and the sustain electrode. The plasma display panel according to any one of claims 1 to 9 , wherein a part of the fine electrode group is composed of a metal electrode containing at least silver as a main component. 10. The plasma display panel according to claim 1, wherein a part of the fine electrode group is composed of at least a chromium / copper / chromium laminated metal electrode. 10. The plasma display panel according to claim 1, wherein a part of the fine electrode group is composed of at least a transparent electrode. 13. The plasma display panel according to claim 1, a plurality of pairs of the scan electrodes for driving the plasma display panel, a display electrode driving circuit connected to the sustain electrodes, and the display electrode driving An image display device comprising at least a control unit for controlling a circuit.

Images