JP2008010193A - Plasma display panel - Google Patents

Abstract

Optimized width of row electrode and partial pressure of xenon in discharge gas to obtain high luminous efficiency, and suppress discharge interference between adjacent cells in the column direction for stable sustain discharge Provided is a plasma display panel that can be performed.
A plurality of row electrode pairs constituted by row electrodes X1, Y1 arranged on a front substrate and facing each other via a discharge gap g1, and a dielectric layer 12 covering the row electrode pairs; A plurality of column electrodes D1 arranged on the other substrate side and extending in the column direction, in which discharge gas containing xenon is sealed in the discharge space, and unit light emitting regions are respectively provided at the intersections between the column electrodes and the row electrode pairs Is formed. The width Wx1, Wy1 in the column direction of the row electrode is set to 150 μm or less, the partial pressure of xenon in the discharge gas is set to 6.67 kPa or more, and the gap in the column direction of the row electrode pair (X1, Y1). An electrode F1 having a floating potential is provided therebetween.
[Selection] Figure 2

Description

  The present invention relates to a plasma display panel used in a large-screen, thin and lightweight display device.

  A surface discharge AC plasma display panel (hereinafter referred to as PDP) generally includes two glass substrates facing each other across a discharge space in which a discharge gas is sealed, and on one glass substrate side, A plurality of row electrode pairs extending in the row direction and arranged in parallel in the column direction are covered with a dielectric layer, and on the other glass substrate side, a plurality of columns extending in the column direction and arranged in parallel in the row direction It has a configuration in which electrodes are arranged. Discharge cells having red, green, and blue phosphor layers are formed in regions facing the intersections between the column electrodes and the row electrode pairs in the discharge space, and the discharge cells are arranged in a matrix on the panel surface. Is arranged.

  A discharge gas containing xenon having a volume ratio of 1 to 10 percent is sealed in the discharge space between the pair of glass substrates.

  In this PDP, an address discharge is selectively generated between one of the row electrodes constituting each row electrode pair and the column electrode, so that wall charges are formed in the opposing dielectric layers. Discharge cells (light emitting cells) and discharge cells (non-light emitting cells) in which the wall charges of the opposing dielectric layer are erased are selectively formed. The light emitting cells and the non-light emitting cells are distributed on the panel surface corresponding to the image data of the video signal.

  After the address discharge, a sustain pulse is alternately applied to the pair of row electrodes of each row electrode pair, and a sustain discharge is generated in the light emitting cell. By this sustain discharge, vacuum ultraviolet rays are generated from xenon in the discharge gas in the discharge space, and the red, green, and blue phosphor layers in each light emitting cell are excited by this vacuum ultraviolet rays, and visible light is generated. An image by matrix display is formed on the panel surface.

  In the PDP configured as described above, the dimensions of the row electrodes are conventionally set as follows.

  FIG. 1 shows a configuration of a portion of a conventional PDP row electrode pair facing one discharge cell C. As shown in FIG. The row electrodes X and Y constituting the row electrode pair (X, Y) extend in parallel to each other in the row direction. The row electrodes X and Y are strip-shaped transparent electrodes Xa and Ya that are opposed to each other with a discharge gap g in the column direction, and strip-shaped bus electrodes Xb and Yb that are connected to overlap with the transparent electrodes Xa and Ya and extend in the row direction. And is composed of. In FIG. 1, D indicates a column electrode.

  The width w in the column direction of each row electrode X, Y of this conventional PDP is set to a value of 400 to 1000 μm (see, for example, Patent Document 1). The width of the row electrode in the column direction is set in this way for the following reason.

  That is, in the PDP, among the vacuum ultraviolet rays generated from the xenon in the discharge gas by the sustain discharge, the phosphor layer is excited by the resonance line having a wavelength of 147 nm, which is the main component, and visible light is generated. This resonance line is attenuated by collision with xenon atoms in the discharge gas and repeated absorption and emission between the xenon atoms in the process of proceeding toward the phosphor layer in the discharge gas. .

  For this reason, in a PDP in which a discharge gas having a low xenon partial pressure in which the volume ratio of xenon contained is 1 to 10%, the amount of resonance lines that reach the phosphor layer during the sustain discharge is small. In some cases, the required brightness cannot be obtained.

  On the other hand, in the conventional PDP, as described above, a sustain discharge is generated in a wide region in the discharge cell C by setting the width w (see FIG. 1) in the column direction of the row electrodes X and Y wide. Thus, the amount of vacuum ultraviolet rays generated by the sustain discharge (that is, the amount of resonance lines) is increased. By setting the amount of resonance lines reaching the phosphor layer to be equal to or greater than a predetermined value, a luminance equal to or higher than the predetermined value is ensured.

  However, the conventional PDP has a problem that it is difficult to obtain a sufficiently high luminous efficiency necessary for forming a high-luminance screen.

In response to this problem, the inventors set the width in the column direction of the portion involved in the discharge performed through the discharge gap of the pair of row electrodes to 150 μm or less, and discharge gas sealed in the discharge space. When the xenon partial pressure in is set to 6.67 kPa or more, it has been found that the luminous efficiency is sufficiently improved, and has been proposed in a previous application (Japanese Patent Application No. 2005-241274).
Japanese Patent Laid-Open No. 8-22772

  However, according to further studies by the present inventors, the characteristic structure proposed by the previous application can provide high luminous efficiency, but discharges interfere with each other between adjacent cells in the column direction, causing unstable sustain discharge. It has been found that there is a problem that the area expands and the operating margin decreases.

  The present invention solves the above-mentioned problems in the conventional PDP, optimizes the width of the row electrode and the partial pressure of xenon in the discharge gas to obtain high luminous efficiency, and discharges interfere with each other between adjacent cells in the column direction. An object of the present invention is to provide a plasma display panel that can suppress the occurrence of the discharge and perform stable sustain discharge.

  The plasma display panel of the present invention is arranged on a pair of substrates facing each other with a discharge space interposed therebetween, on one side of the pair of substrates, arranged in a row direction, and arranged in a column direction, and each of the substrates is discharged. A plurality of row electrode pairs composed of a pair of row electrodes facing each other through a gap, a dielectric layer formed on the one substrate side to cover the row electrode pair, and disposed on the other substrate side A plurality of column electrodes extending in the column direction and arranged in parallel in the row direction, the discharge gas containing xenon is enclosed in the discharge space, and the discharge at a portion where the column electrode and the row electrode pair intersect A unit light emitting region is formed in each space.

  In order to solve the above problems, the width in the column direction of the pair of row electrodes constituting the row electrode pair is set to 150 μm or less, and the partial pressure of xenon in the discharge gas is set to 6.67 kPa or more. In addition, an electrode having a floating potential is provided between the gaps in the column direction of the row electrode pair.

  According to the above configuration, by sufficiently limiting the width of the row electrode in the column direction and the partial pressure of xenon in the discharge gas to a predetermined range, a sufficiently high luminous efficiency for forming a high-luminance screen can be obtained. In addition, the provision of floating potential electrodes suppresses the mutual interference of discharges between adjacent cells in the column direction, and improves the reduction in the operating margin due to the expansion of the unstable region of the sustain discharge. .

  In the plasma display panel of the present invention configured as described above, the electrodes forming the floating potential can be formed in a stripe shape extending in the row direction.

  Alternatively, the electrode for forming the floating potential can be formed in an island shape corresponding to the unit light emitting region.

  Hereinafter, the plasma display panel according to the embodiment of the present invention will be described. Note that the structures shown in the embodiments are for understanding the present invention, and the technical scope of the present invention is not limited thereto.

  The PDP according to the present invention is premised on the configuration of the prior application (Japanese Patent Application No. 2005-241274). That is, the width in the column direction of the portion involved in the discharge performed through the respective discharge gaps of the pair of row electrodes constituting the row electrode pair is set to 150 μm or less, and between the front glass substrate and the rear glass substrate. It is assumed that a discharge gas in which the partial pressure of xenon is set to 6.67 kPa or more is enclosed in the discharge space.

  In the conventional PDP, the width in the column direction of the portion related to the discharge performed through the discharge gap among the components of the pair of row electrodes is 400 to 1000 μm. On the other hand, according to the above configuration of the PDP as a premise of the present invention, the width of the same portion is smaller and is set to 150 μm or less. As a result, the depth in which the discharge generated between the row electrodes spreads in the unit light emitting region of the discharge space is narrower than that of the conventional PDP, and the discharge growth region overlaps the generation region of the initial glow discharge. It is limited to a narrow area in the vicinity of. As a result, generation of vacuum ultraviolet rays from xenon in the discharge gas is performed with a very high efficiency as compared with the conventional PDP.

  In addition, since the xenon partial pressure in the discharge gas is set to 6.67 kPa or more, the phosphor layer is excited mainly by a molecular beam having a wavelength of 172 nm among vacuum ultraviolet rays generated from the xenon in the discharge gas. Done. Unlike the resonance line, this molecular beam hardly attenuates in the process of traveling in the discharge gas. As a result, even when the discharge generated between the row electrodes is localized in the vicinity of the discharge gap, the vacuum ultraviolet rays sufficiently reach the phosphor layer, so that generation of vacuum ultraviolet rays is generated as compared with the conventional PDP. However, it is possible to obtain a high luminous efficiency while maintaining the characteristic of being performed with high efficiency.

  2 and 3 show a PDP 10 according to an embodiment of the present invention. 2 is a front view schematically showing a part of the PDP 10 in the present embodiment, and FIG. 3 is a cross-sectional view taken along the line V1-V1 of FIG.

  2 and 3, a plurality of row electrode pairs (X1, Y1) extending in the row direction (left and right direction in FIG. 2) are arranged on the back surface of the front glass substrate 11 serving as a display surface. Are arranged in parallel at equal intervals.

  One row electrode X1 constituting the row electrode pair (X1, Y1) is formed of a transparent electrode X1a formed of a transparent conductive film such as ITO on the back surface of the front glass substrate 11 and extending in a strip shape in the row direction, and the transparent electrode X1a The bus electrode X1b is formed of a metal film at the center position on the back surface and extends in a strip shape in the row direction, in which the width in the column direction is smaller than the width in the column direction of the transparent electrode X1a.

  Similarly to the row electrode X1, the other row electrode Y1 constituting the row electrode pair (X1, Y1) is formed of a transparent conductive film such as ITO on the back surface of the front glass substrate 11 and extends in a strip shape in the row direction. And a bus electrode Y1b that is formed of a metal film at the center position of the back surface of the transparent electrode Y1a and extends in a strip shape in the row direction, in which the width in the column direction is smaller than the width in the column direction of the transparent electrode Y1a. The transparent electrode Y1a of the row electrode Y1 is disposed so as to extend in parallel with the transparent electrode X1a of the row electrode X1 with a predetermined interval.

  The row electrodes X1 and Y1 are alternately arranged along the column direction of the front glass substrate 11, and a predetermined interval between the pair of row electrodes X1 and Y1 facing each other and the transparent electrodes X1a and Y1a is set. The discharge gap g1 is configured.

  A dielectric layer 12 is further formed on the back surface of the front glass substrate 11, and the row electrode pair (X1, Y1) is covered with the dielectric layer 12. Further, although not shown, a secondary electron emission layer made of a high γ material such as magnesium oxide (MgO) is formed so as to cover the entire dielectric layer 12.

  A rear glass substrate 13 is disposed so as to face the front glass substrate 11 in parallel through the discharge space. On the surface of the rear glass substrate 13 facing the front glass substrate 11, a plurality of column electrodes D1 extending in a strip shape in the column direction are formed at equal intervals with a predetermined interval in the row direction. Unit light emitting regions are formed in the discharge spaces where the column electrodes D1 and the row electrode pairs (X1, Y1) cross each other.

  A column electrode protective layer (dielectric layer) 14 is further formed on the surface of the column electrode D 1 of the back glass substrate 13, and the column electrode D 1 is covered with the column electrode protective layer 14. A partition wall 15 is formed on the column electrode protective layer 14.

  The partition wall 15 is formed in a lattice shape by a plurality of vertical wall portions 15B and a plurality of horizontal wall portions 15A so as to partition the unit light emitting region. The plurality of vertical wall portions 15B extend in parallel in the column direction and are arranged in parallel at equal intervals with a predetermined interval in the row direction. The plurality of lateral wall portions 15A extend in the row direction at intermediate positions between the row electrode pairs (X1, Y1) adjacent to each other in the column direction. The partition wall 15 is formed such that the height of the horizontal wall portion 15A is lower than the height of the vertical wall portion 15B.

  A plurality of discharge cells C1 arranged in a matrix on the panel surface are formed by partitioning the discharge spaces between the front glass substrate 11 and the rear glass substrate 13 by the partition walls 15. The row electrode pairs (X1, Y1) are arranged so as to face each other at the center of each discharge cell C1.

  In each discharge cell C1, the four side surfaces 15A and 15B of the partition wall 15 facing the discharge space in the discharge cell C1 and the surface of the column electrode protective layer 14 cover all these five surfaces. Thus, the phosphor layer 16 is formed. The color of the phosphor layer 16 is divided into three primary colors red, green, and blue for each discharge cell C1, and the three primary colors are arranged in order in the row direction.

  A discharge gas containing xenon is sealed in the discharge space.

  Here, as a main feature of the present invention, a striped electrode F1 having a floating potential is formed at a position facing the lateral wall portion 15A between the gaps in the column direction of the adjacent row electrode pairs (X1, Y1). Has been.

  The dimensions of the row electrodes X1 and Y1 of the PDP 10 and the configuration of the discharge gas are set as follows.

  The width in the column direction of each row electrode X1, Y1, that is, the width Wx1 in the column direction of the transparent electrode X1a and the width Wy1 in the column direction of the transparent electrode Y1a (see FIG. 2) are set to 150 μm or less, respectively.

  The xenon partial pressure in the discharge gas sealed in the discharge space is set to 6.67 kPa (50 torr) or more.

  When the PDP 10 is caused to emit light, a scan pulse is sequentially applied to the row electrode Y1 of each row electrode pair (X1, Y1), and at the same time, a data pulse is selectively applied to the column electrode D1. As a result, in the discharge cell C1 formed at the intersection of the row electrode Y1 to which the scan pulse is applied and the column electrode D1 to which the data pulse is applied, the row electrode Y1 and the column electrode D1 Address discharge occurs between them. By this address discharge, light emitting cells and non-light emitting cells are formed, and the light emitting cells and the non-light emitting cells are distributed on the panel surface corresponding to the image data of the video signal.

  Thereafter, a sustain pulse is alternately applied to the row electrodes X1 and Y1 that are paired with each of the row electrode pairs (X1, Y1), and a discharge occurs between the transparent electrodes X1a and Y1a in the light emitting cell. Sustain discharge is generated through the gap g1. Due to this sustain discharge, vacuum ultraviolet rays are generated from xenon in the discharge gas sealed in the discharge space in the light emitting cell, and the red, green, and blue phosphor layers 16 in the light emitting cell are excited by the vacuum ultraviolet rays. By generating visible light, an image by matrix display is formed on the panel surface.

  In this PDP 10, the width Wx1 of each row electrode X1 and the width Wy1 of the transparent electrode Y1 in the column direction are set to 150 μm or less, respectively, and the partial pressure of xenon in the discharge gas in the discharge space is 6.67 kPa ( When it is set to 50 torr or more, high luminous efficiency can be obtained during the sustain discharge as described above during image formation. The reason is as follows.

  FIG. 4 shows the relationship between the width in the column direction of the row electrodes in the PDP 10 (hereinafter referred to as electrode width) and the light emission efficiency. The relationship shown in FIG. 4 is based on the measurement results when the discharge cell size is 700 (μm) × 310 (μm) and the opening size is 640 (μm) × 250 (μm).

  In FIG. 4, when the partial pressure of xenon is less than 6.67 kPa (50 torr) (in FIG. 4, the case where the partial pressure of xenon is 2.67 kPa (20 torr) is shown), the light emission increases as the electrode width decreases. Efficiency is decreasing. On the other hand, when the partial pressure of xenon is 6.67 kPa (50 torr) or more, the light emission efficiency increases as the electrode width decreases, and as the partial pressure of xenon increases (in FIG. 4, the partial pressure of xenon is 13.33 kPa (100 torr). )), The increase in luminous efficiency becomes remarkable.

  As the luminous efficiency of the PDP, a value of 2.0 (lm / W) or more is sufficiently useful in practice. From the measurement results shown in FIG. 4, if the xenon partial pressure in the discharge gas is set to 6.67 kPa (50 torr) or more and the electrode widths Wx1 and Wy1 of the row electrodes X1 and Y1 are 150 μm or less, 2.0 It can be seen that a luminous efficiency of (lm / W) or higher can be obtained and the required luminous efficiency can be ensured.

  Thus, in the state where the xenon partial pressure in the discharge gas is 6.67 kPa (50 torr) or more, the light emission efficiency increases as the electrode width decreases for the following reason.

  FIG. 5 is a graph showing a general growth process of discharge, and FIG. 6 is a state diagram showing a growth process of sustain discharge in a conventional discharge cell. As shown in FIGS. 5 and 6, the sustain discharge generated in the discharge cell at the time of image formation as described above grows through the processes of townsend discharge, initial glow discharge, and glow discharge.

  In general, the generation of vacuum ultraviolet rays at the time of PDP image formation uses the period of the initial glow discharge and the glow discharge during the sustain discharge generation period.

  Among the discharge periods used for the generation of vacuum ultraviolet rays, in the initial glow discharge period, the energy at the cathode descending portion formed mainly by ions near the cathode in the process before space charge localization is completed. Therefore, vacuum ultraviolet rays are generated with very high efficiency.

  In the glow discharge period following the initial glow discharge period, a very strong electric field is formed in the discharge space by the generation of the cathode descending portion, and a large amount of high energy electrons are generated by this strong electric field, which becomes the exit of the strong electric field portion. A large amount of vacuum ultraviolet rays is generated in the negative glow portion. However, since energy loss occurs in the cathode descending portion, the generation efficiency of vacuum ultraviolet rays is not high compared with the initial glow discharge period.

  As shown in FIG. 6, the sustain discharge generated in the discharge cell of the PDP generally grows three-dimensionally from the anode side to the cathode side of the row electrode pair as shown in FIG.

  In the PDP 10 of the present embodiment, the electrode widths Wx1 and Wy1 of the row electrodes X1 and Y1 are set to 150 μm or less, respectively, and the depth at which the sustain discharge spreads in the discharge cell C1 is narrower than that of the conventional PDP. The growth region of this sustain discharge is limited to a narrow region (region indicated by e in FIG. 6) near the discharge gap g1. In the PDP 10, a sustain discharge that occurs in a narrow region near the discharge gap g1 is hereinafter referred to as a narrow depth discharge.

  The growth region of the narrow depth discharge overlaps with the generation region of the initial glow discharge of FIG. 6 in which the vacuum ultraviolet rays are generated with very high efficiency as described above. Therefore, in this PDP 10, the electrode widths Wx1 and Wy1 of the row electrodes X1 and Y1 are set to 150 μm or less, respectively, and the sustain discharge becomes a narrow depth discharge. Can be performed with high efficiency.

  On the other hand, in the PDP 10 of the present embodiment, as in the conventional case, a discharge gas having a low xenon partial pressure is sealed in the discharge space, and the resonance mainly having a wavelength of 147 nm of vacuum ultraviolet rays generated from the xenon in the discharge gas. When the phosphor layer 16 is excited by a line, a sustain discharge, which is a narrow-depth discharge generated in the PDP, is localized in a range in the vicinity of the discharge gap g1, so that the phosphor of the resonance line of this vacuum ultraviolet ray The attenuation until reaching the layer 16 is warped and increased.

  In general, when the xenon partial pressure in the discharge gas is 2.67 to 3.33 kPa (20 to 25 torr), the main component of the vacuum ultraviolet ray generated from the discharge gas is a resonance line having a wavelength of 147 nm. It is known that this resonance line is attenuated to almost half while traveling through the discharge gas by 100 μm under the condition that the partial pressure of xenon is 2.67 to 3.33 kPa (20 to 25 torr).

  In the PDP 10 of the present embodiment, when the xenon partial pressure in the discharge gas is 6.67 kPa (50 torr) or more, the vacuum ultraviolet rays generated from the xenon in the discharge gas mainly by molecular beams having a wavelength of 172 nm. The phosphor layer 16 is excited. Unlike the resonance line, this molecular beam of vacuum ultraviolet rays hardly attenuates in the process of traveling in the discharge gas.

  Therefore, in the PDP 10, even when the sustain discharge becomes a narrow depth discharge and is localized in the range in the vicinity of the discharge gap g1, the vacuum ultraviolet rays sufficiently reach the phosphor layer 16. Therefore, the characteristic that the generation of vacuum ultraviolet rays is performed with a very high efficiency as compared with the conventional PDP by utilizing the sustain discharge as a narrow depth discharge is utilized as it is, and thereby, a high luminous efficiency can be obtained.

  Further, in the PDP 10, since the width in the column direction of the row electrodes X1 and Y1 is significantly smaller than that of the conventional PDP, the capacitance formed between the electrodes is greatly reduced. Generation of reactive current is reduced and power consumption is reduced.

  In the above configuration, the row electrode pair (X1, Y1) of the PDP 10 is arranged at the center position of the discharge cell C1 in the column direction with respect to the discharge cell C1, but the row electrode pair (X1, Y1) May be arranged at a position shifted vertically from the center position in the column direction with respect to the discharge cell C1. The reason is as follows.

  In the conventional PDP, as described above, the sustain discharge is a deep discharge that spreads over the entire discharge cell. Therefore, when the row electrode pair is arranged to be shifted from the center position of the discharge cell in the column direction up or down with respect to the discharge cell partitioned by the grid-shaped partition, the discharge gap partitions the discharge cell. It will be biased to one of the upper and lower horizontal wall portions of the partition wall, thereby causing variations in voltage margin, luminance, luminous efficiency, etc. for each discharge cell. As a result, there arises a problem that the light emission is adversely affected. Therefore, in the conventional PDP, high positional accuracy of the row electrode pair is required with respect to the discharge cell.

  On the other hand, in the PDP 10 of the present embodiment, the sustain discharge becomes a narrow depth discharge as described above, and a so-called point light source in which the generation region of vacuum ultraviolet rays is smaller than that of the conventional PDP. For this reason, the phosphor layer 16 is excited using a molecular beam having a wavelength of 172 nm, which is less susceptible to the effects of the barrier wall due to wall loss and the like, and absorbs less vacuum ultraviolet rays. The influence of variation in the distance between the phosphor layer 16 and the phosphor layer 16 is reduced. As a result, even when the column-direction position of the row electrode pair (X1, Y1) with respect to the discharge cell C1 is deviated from the center position, the PDP 10 of the present embodiment hardly varies in luminous efficiency and luminance.

  As described above, according to the PDP 10 of the present embodiment, even when the partition 15 has a substantially lattice shape and the periphery of the discharge cell C1 is surrounded by the horizontal wall portion 15A and the vertical wall portion 15B, the discharge gap The position (that is, the position of the row electrode pair) does not need to be accurately positioned at the center position of the discharge cell in the column direction. Therefore, the tolerance of the positional accuracy of the row electrode pair (X1, Y1) with respect to the discharge cell C1 is large, and the manufacturing cost can be reduced by improving the product yield in the manufacturing process.

  In the above configuration, each of the transparent electrodes constituting the row electrode is formed in a continuous strip shape between adjacent discharge cells along the bus electrode. However, the transparent electrode is independent for each discharge cell. It may be configured to be formed and connected to the bus electrode. Furthermore, although the row electrode is composed of a transparent electrode and a bus electrode, the row electrode may be composed only of a metal bus electrode and the width in the column direction may be set to 150 μm or less.

  Below, the effect by installing the electrode F1 of the floating electric potential which is the characteristics of this invention is demonstrated.

  As described above, a high light emission efficiency can be obtained by reducing the width in the column direction of each of the pair of row electrodes X1 and Y1 to 150 μm or less. It has been found that interference occurs and affects the stability of the discharge.

  Therefore, as a result of studying to solve this problem, as shown in FIG. 2, by installing the floating potential electrode F1 between the gaps in the column direction of the row electrode pairs (X1, Y1), adjacent cells It was possible to improve the instability of the discharge due to the interference of the discharge.

  FIG. 7 is a graph showing the results of measuring the relationship between the width of the electrode F1 at the floating potential and the sustain voltage margin. Here, the sustain voltage margin is a value obtained by subtracting the sustain voltage when all the cells are turned off from the discharge sustain voltage when all the cells are turned on. As can be seen from FIG. 7, it was confirmed that the voltage margin was increased as the electrode F1 having a floating potential was installed and the electrode width was increased.

  The arrangement of the electrode F1 that forms the floating potential can obtain the effects of the present invention regardless of the mode as shown in FIGS. FIG. 8 shows a case where the electrode F1 is formed in a stripe shape extending in the row direction. FIG. 9 shows a case where the electrode F1 is formed in an island shape corresponding to the unit light emitting region (discharge cell C1).

  As described above, according to the configuration of the present embodiment, it is possible to obtain the high emission efficiency by utilizing the characteristic that the generation of vacuum ultraviolet rays is performed with high efficiency as compared with the conventional PDP. The effect of the invention of Japanese Patent Application No. 2005-241274) is maintained as it is, the interference of discharge between adjacent cells is weak, the sustain discharge can be caused stably, and the performance of the PDP can be further improved.

  In the above-described embodiment, on the premise of the configuration corresponding to the first example shown in the prior application (Japanese Patent Application No. 2005-241274), the gaps in the column direction of the row electrode pairs (X1, Y1) The configuration when the electrode F1 having a floating potential is provided is shown. However, the technical idea of the present invention is not limited to such a case, and can be applied to configurations corresponding to other embodiments shown in the prior application.

  As described above, according to the PDP of the present invention, among the constituent parts of the pair of row electrodes constituting the pair of row electrodes, the width in the column direction of the part involved in the discharge performed through the discharge gap between the row electrodes However, since the width is set to 150 μm or less, which is smaller than the width of 400 to 1000 μm in the conventional PDP, the depth in which the discharge generated between the row electrodes spreads in the unit light emitting region of the discharge space is larger than that in the conventional PDP. Thus, the growth region of this discharge is limited to a narrow region in the vicinity of the discharge gap overlapping with the generation region of the initial glow discharge. As a result, generation of vacuum ultraviolet rays from xenon in the discharge gas is performed with a very high efficiency as compared with the conventional PDP.

  In addition, since the xenon partial pressure in the discharge gas is set to 6.67 kPa (50 torr) or more, among the vacuum ultraviolet rays generated from the xenon in the discharge gas, the phosphor layer is mainly formed by a molecular beam having a wavelength of 172 nm. Unlike the resonance line, this molecular beam hardly attenuates in the process of traveling in the discharge gas, so that the discharge generated between the row electrodes is localized in the vicinity of the discharge gap. Even in the case of being converted, the vacuum ultraviolet rays sufficiently reach the phosphor layer.

  Thus, the effect of the invention of the prior application (Japanese Patent Application No. 2005-241274), in which the property of generating vacuum ultraviolet rays with high efficiency as compared with the conventional PDP is utilized as it is, and high luminous efficiency can be obtained. Is maintained as it is, and interference of discharge between adjacent cells is weak, so that the sustain discharge can be stably generated, and the reliability of the PDP can be further improved.

  Further, the PDP of the present invention has a vacuum ultraviolet ray generation region in the unit light emitting region smaller than that of the conventional PDP. Therefore, even when the unit light emitting region is partitioned by the partition wall, it is affected by the partition wall due to wall loss or the like. It becomes difficult to receive. In addition, since the phosphor layer is excited using a molecular beam of vacuum ultraviolet rays, the influence of variations in the distance between the generation region of the vacuum ultraviolet rays and the phosphor layer is reduced. High accuracy is not required for the position in the row direction of the pair, and the product yield in the manufacturing process is improved, thereby contributing to the reduction in manufacturing cost.

  According to the present invention, it is possible to obtain high luminous efficiency, and further, it is possible to obtain a PDP in which discharges are suppressed from interfering with each other between adjacent cells in the column direction, and stable sustain discharge is performed, This is useful for manufacturing a thin display device.

It is a front view which shows the structure of the conventional PDP. It is a front view which shows PDP in one embodiment of this invention. FIG. 5 is a cross-sectional view taken along line V1-V1 of FIG. It is a figure which shows the relationship between the width | variety of the electrode in PDP, and luminous efficiency. It is a figure which shows the general growth process of the discharge in PDP. It is a state diagram which shows the growth process of the sustain discharge in the discharge cell of PDP. It is a graph which shows the relationship between the width | variety of the electrode F1 of the floating electric potential in the PDP of embodiment of this invention, and a maintenance voltage margin. It is a front view which shows the example of arrangement | positioning of the electrode F1 of the same floating potential. It is a front view which shows the other example of arrangement | positioning of the electrode F1 of the same floating electric potential.

Explanation of symbols

10 PDP
11 Front glass substrate (one substrate)
12 Dielectric layer 13 Back glass substrate (the other substrate)
14 row electrode protective layer (dielectric layer)
15 partition wall 15A horizontal wall portion 15B vertical wall portion 16 phosphor layer C, C1 discharge cell (unit light emission region)
D, D1 column electrode F1 floating electrode X, X1, Y, Y1 row electrode Xa, X1a, Ya, Y1a transparent electrode Xb, X1b, Yb, Y1b bus electrode W, Wx1, Wy1 width in column direction g, g1 discharge gap

Claims (3)

A pair of substrates opposed to each other with a discharge space interposed therebetween, and a pair of substrates disposed on one side of the pair of substrates extending in the row direction and juxtaposed in the column direction, and facing each other via a discharge gap A plurality of row electrode pairs formed by the row electrodes, a dielectric layer formed on the one substrate side to cover the row electrode pairs, and arranged on the other substrate side and extending in the column direction. And a plurality of column electrodes arranged in parallel to each other, a discharge gas containing xenon is enclosed in the discharge space, and a unit light emitting region is formed in the discharge space where the column electrode and the row electrode pair intersect each other. In a plasma display panel
The width in the column direction of the pair of row electrodes constituting the row electrode pair is set to 150 μm or less, and the partial pressure of xenon in the discharge gas is set to 6.67 kPa or more,
A plasma display panel, wherein an electrode having a floating potential is disposed between gaps in the column direction of the row electrode pair.   The plasma display panel according to claim 1, wherein the electrodes forming the floating potential have a stripe shape extending in a row direction.   The plasma display panel according to claim 1, wherein the electrode forming the floating potential is formed in an island shape corresponding to the unit light emitting region.

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