JP2007311127A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP with improved light emission efficiency. <P>SOLUTION: A column-direction width of transparent electrodes X1a, Y1a carrying out sustaining discharge through each discharge gap g1 of a pair of row electrodes X1, Y1 constituting a row electrode pair (X1, Y1) of the PDP is set at 150 μm or less, a xenon partial pressure in discharge gas sealed in a discharge space is set at 6.67 kPa or more, and a dielectric layer 12 is formed of a dielectric material with a specific inductive capacity of 9.3 or less. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a configuration of a plasma display panel.

  A surface discharge type AC plasma display panel (hereinafter referred to as PDP) is generally one glass substrate side of two glass substrates facing each other across a discharge space in which a discharge gas is sealed. 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 Electrodes are arranged, and discharge cells having red, green, and blue phosphor layers are formed at portions where the row electrode pairs and the column electrodes of the discharge space intersect, and the discharge cells are matrixed on the panel surface. The structure arranged in the shape is provided.

  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 row electrode and a column electrode of a pair of row electrodes constituting a row electrode pair, so that a light emitting cell (dielectric material of an opposing portion) is formed. A discharge cell in which wall charges are formed in the layer) and a non-light emitting cell (a discharge cell in which the wall charge of the dielectric layer in the opposite portion is erased) are selected, and the light emitting cell and the non-light emitting cell Are distributed on the panel surface corresponding to the image data of the video signal.

  Thereafter, a sustain pulse is alternately applied to the pair of row electrodes of each row electrode pair to generate a sustain discharge in the light emitting cell, and this sustain discharge causes xenon in the discharge gas in the discharge space. A vacuum ultraviolet ray is generated, and the red, green, and blue phosphor layers in each light emitting cell are excited by the vacuum ultraviolet ray to generate visible light, whereby 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.

  That is, FIG. 1 shows a configuration of a portion of a conventional PDP row electrode pair facing one discharge cell C. In FIG. 1, the row constituting the row electrode pair (X, Y) is shown. The electrodes X and Y extend in parallel to each other in the row direction and are opposed to each other through the discharge gap g in the column direction and are connected to the transparent electrodes Xa and Ya in the row direction. It is comprised by the extended strip | belt-shaped bus electrodes Xb and Yb.

In FIG. 1, D is 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).

  In this conventional PDP, the width of the row electrode in the column direction is set as described above for the following reason.

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

  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.

  In the conventional PDP, as described above, the width w (see FIG. 1) of the row electrodes X and Y in the column direction is set wide so that the sustain discharge is generated in a wide area in the discharge cell C. The amount of vacuum ultraviolet rays generated by the sustain discharge (that is, the amount of resonance lines) is increased so that the amount of resonance lines reaching the phosphor layer becomes equal to or higher than a predetermined value. Is to be secured.

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

Japanese Patent Laid-Open No. 8-22772

  An object of the present invention is to solve the problems of the conventional PDP as described above.

  In order to achieve the above object, a PDP according to a first invention (the invention described in claim 1) is arranged on a pair of substrates facing each other across a discharge space and on one substrate side of the pair of substrates. And extending in the row direction and arranged in parallel in the column direction, each of which is formed on the one substrate side with a plurality of row electrode pairs each composed of a pair of row electrodes facing each other through a discharge gap. A dielectric layer covering the row electrode pair, and a plurality of column electrodes arranged on the other substrate side and extending in the column direction and arranged side by side in the row direction. In a plasma display panel in which a unit light emitting region is formed in each discharge space and a discharge gas containing xenon is sealed in the discharge space, the width in the column direction of the pair of row electrodes constituting the row electrode pair is 150 μm or less Set to Partial pressure of xenon in the discharge gas is set to at least 6.67 kPa, said dielectric layer, the dielectric constant is characterized by being formed by a 9.3 or less dielectric material.

  In order to achieve the above object, a PDP according to a second invention (invention according to claim 10) is arranged on a pair of substrates facing each other across a discharge space and on one of the pair of substrates. And extending in the row direction and arranged in parallel in the column direction, each of which is formed on the one substrate side with a plurality of row electrode pairs each composed of a pair of row electrodes facing each other through a discharge gap. A dielectric layer covering the row electrode pair, and a plurality of column electrodes arranged on the other substrate side and extending in the column direction and arranged side by side in the row direction. In the plasma display panel in which the unit light emitting regions are formed in the discharge spaces and the discharge gas containing xenon is sealed in the discharge spaces, the dielectric layer has a thin film portion and a thickness smaller than the thin film portion. Large thick film part The thin-film portion of the dielectric layer is a dielectric layer that covers a portion of the paired row electrodes with a width of 150 μm or less in the column direction of the tip portion on the discharge gap side, and is in the discharge gas. The partial pressure of xenon is set to 6.67 kPa or more, and at least a thin film portion of the dielectric layer is formed of a dielectric material having a relative dielectric constant of 9.3 or less.

  In order to achieve the above object, a PDP according to a third invention (invention according to claim 19) is arranged on a pair of substrates facing each other across the discharge space and on one substrate side of the pair of substrates. And extending in the row direction and arranged in parallel in the column direction, each of which is formed on the one substrate side with a plurality of row electrode pairs each composed of a pair of row electrodes facing each other through a discharge gap. A dielectric layer covering the row electrode pair, and a plurality of column electrodes arranged on the other substrate side and extending in the column direction and arranged side by side in the row direction. In a plasma display panel in which a unit light emitting region is formed in each discharge space, and a discharge gas containing xenon is sealed in the discharge space, the column direction of the tip portion on the discharge gap side of each of the pair of row electrodes Width 15 A secondary electron emission layer is formed of a high γ material on a dielectric layer including a portion of μm or less and a portion facing the discharge gap, and the partial pressure of xenon in the discharge gas is set to 6.67 kPa or more. The dielectric layer is made of a dielectric material having a relative dielectric constant of 9.3 or less.

  In the PDP according to the present invention, 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 the front glass substrate and A discharge gas having a xenon partial pressure set to 6.67 kPa or higher is enclosed in the discharge space between the rear glass substrates, and the dielectric layer covering the row electrode pair has a relative dielectric constant of 9.3 or lower. A PDP formed of a dielectric material is the best embodiment.

  In the PDP in this embodiment, the width in the column direction of the portion related to the discharge performed through the discharge gap between the row electrodes among the constituent portions of the pair of row electrodes constituting the row electrode pair is the conventional PDP. Is set to 150 μm or less, which is smaller than the width of 400 to 1000 μm, the depth at 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, The growth region of this discharge is limited to a narrow region near the discharge gap that overlaps with the initial glow discharge generation region.

  As a result, the PDP in this embodiment can generate vacuum ultraviolet rays from xenon in the discharge gas with a much higher efficiency than the conventional PDP.

  Furthermore, the PDP in this embodiment has a xenon partial pressure in the discharge gas set to 6.67 kPa or more, and therefore, among the vacuum ultraviolet rays generated from the xenon in the discharge gas, a molecular beam having a wavelength of 172 nm is mainly used. The phosphor layer is excited, and this molecular beam hardly attenuates in the process of traveling in the discharge gas like the resonance line, so that the discharge generated between the row electrodes is near the discharge gap. Even when localized in the range, since the vacuum ultraviolet rays will sufficiently reach the phosphor layer, the characteristic that the generation of vacuum ultraviolet rays is performed with high efficiency as compared with the conventional PDP is utilized as it is, High luminous efficiency can be obtained.

  In the PDP in this embodiment, the dielectric layer covering the row electrode pair has a relative dielectric constant of 9.3 or less, preferably 8 or less, for example, zinc oxide glass or zinc oxide glass. By being formed of a low dielectric material such as a mixture with phosphorus oxide-based glass, the amount of ionization during sustain discharge is suppressed in a PDP that discharges narrowly and discharges high xenon partial pressure. The luminous efficiency can be further improved by increasing the amount of vacuum ultraviolet light irradiated to the phosphor layer by improving the vacuum ultraviolet ray generation efficiency.

  In the PDP of the above embodiment, it is preferable to form the dielectric layer so as to have a film thickness of 35 μm or more in the direction perpendicular to the substrate.

  As a result, the variation in discharge current caused by the variation in the thickness of the dielectric layer for each unit light emitting region is reduced, thereby reducing the variation in the light emission efficiency for each unit light emitting region and stabilizing the entire surface of the panel. It becomes possible to manufacture a PDP capable of obtaining the luminous efficiency.

  In the PDP of the above embodiment, the generation region of the vacuum ultraviolet light in the unit light emitting region is smaller than that of the conventional PDP. Therefore, even when the unit light emitting region is partitioned by the partition wall, In addition to being hardly affected, the phosphor layer is excited using the molecular beam of vacuum ultraviolet rays, so 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 of the row electrode pair in the column direction with respect to the light emitting region, which can contribute to a reduction in manufacturing cost due to an improvement in product yield in the manufacturing process.

  As a configuration in which 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, first, the column direction of each row electrode is Configuration in which the width is set to 150 μm or less, and secondly, with respect to the dielectric layer covering the row electrode pair, the thickness of the dielectric layer covering the column width of 150 μm or less in the column direction at the tip of each row electrode In which the thickness of the dielectric layer in the other part is large and discharge is allowed only in the column width of 150 μm or less in the column direction at the tip part of the row electrode. A structure in which a secondary electron emission layer is formed of a high γ material on a portion of the row electrode having a width of 150 μm or less in the column direction and a dielectric layer in a portion facing the discharge gap at the tip portion of each row electrode on the discharge gap side Etc.

  In the PDP having the first configuration, since the width of each row electrode in the column direction is significantly smaller than that of the conventional PDP, the capacitance formed between the electrodes is greatly reduced. The generation of current is reduced and the power consumption can be reduced.

  The PDP having the second configuration does not require a change in the configuration of the conventional row electrode pair, so that a large change in the manufacturing process is not required, and the formation position and thickness dimension of the dielectric layer are arbitrarily set. Therefore, it is possible to reduce the manufacturing cost and improve the product yield by increasing the degree of freedom in design and manufacturing.

  In the PDP having the third configuration, since the discharge generation region between the row electrodes is freely set depending on the formation position and size of the secondary electron emission layer, the degree of freedom in design and manufacturing is increased, and the design change, etc. It is possible to respond flexibly to.

  2 and 3 show a first example of the embodiment of the PDP according to the present invention. FIG. 2 is a front view schematically showing a part of the PDP in the first example. FIG. It is sectional drawing in the V1-V1 line | wire.

  2 and 3, in the PDP 10, a plurality of row electrode pairs (X1, Y1) extending in the row direction (left-right direction in FIG. 2) are arranged in the column direction (FIG. 2) on the back surface of the front glass substrate 11 as a display surface. Are arranged in parallel at equal intervals.

  One row electrode X1 constituting the row electrode pair (X1, Y1) includes a transparent electrode X1a formed on the back surface of the front glass substrate 11 so as to extend in a row shape in the row direction by a transparent conductive film such as ITO, At the center position of the back surface of the transparent electrode X1a, the bus electrode X1b is formed of a metal film and extends in the strip-shaped row direction having a width in the column direction 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 on the back surface of the front glass substrate 11 so as to extend in a strip shape in the row direction by a transparent conductive film such as ITO. The transparent electrode Y1a positioned so as to extend in parallel with the transparent electrode X1a of the row electrode X1 and the center position of the back surface of the transparent electrode Y1a is formed by a metal film and has a width in the column direction. A bus electrode Y1b extending in the strip-like row direction is smaller than the width of the transparent electrode Y1a in the column direction.

  The row electrodes X1 and Y1 are alternately arranged along the column direction of the front glass substrate 11, and in each row electrode pair (X1, Y1), the paired row electrodes X1 and Y1 are opposed to each other. The required width intervals between the electrodes X1a and Y1a each form a discharge gap g1.

  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.

  This dielectric layer 12 is made of a low dielectric material having a relative dielectric constant of 9.3 or less, preferably 8 or less, for the reason described in detail later, and a film thickness d1 in a direction perpendicular to the front glass substrate 11. Is formed to be 35 μm or more.

Examples of the low dielectric material having a dielectric constant of 9.3 or less for forming the dielectric layer 12 include zinc oxide (ZnO) glass, zinc oxide (ZnO) glass, and phosphorus oxide (P ₂ O ₅ ). Examples thereof include a mixture with a system glass.

  A protective layer (not shown) made of a high γ material such as magnesium oxide (MgO) is formed on the back side of the dielectric layer 12 so as to cover the entire back side.

  A rear glass substrate 13 is opposed to the front glass substrate 11 in parallel through a 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. .

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

  A partition wall 15 having the following shape is formed on the column electrode protective layer 14.

  That is, the partition wall 15 includes a plurality of horizontal walls 15A extending in the row direction at positions facing the intermediate positions between the row electrode pairs (X1, Y1) adjacent to each other in the column direction, and extending in the column direction and in the row direction. It is formed in a substantially lattice shape by a plurality of vertical walls 15B arranged at equal intervals with a required interval.

  The partition walls 15 divide the discharge space between the front glass substrate 11 and the rear glass substrate 13 into a substantially square shape, thereby forming a plurality of discharge cells C1 arranged in a matrix on the panel surface. .

  The pair of row electrodes (X1, Y1) is opposed to the central portion of each discharge cell C1.

  In each discharge cell C1, the four side surfaces of the horizontal wall 15A and the vertical wall 14B of the partition wall 15 facing the discharge space in the discharge cell C1 and the surface of the column electrode protective layer 14 are all covered with these five surfaces. The phosphor layer 16 is formed with the colors of the 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. Yes.

  A discharge gas having a total pressure of 66.7 kPa (500 Torr) including xenon is sealed in the discharge space.

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

  That is, 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 partial pressure of xenon in the discharge gas sealed in the discharge space is set to 6.67 kPa (50 Torr) or more.

  In this PDP 10, 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, and this scan pulse is applied. An address discharge is generated between the row electrode Y1 and the column electrode D1 in the discharge cell C1 formed at the intersection of the row electrode Y1 and the column electrode D1 to which the data pulse is applied, A light emitting cell formed by this address discharge (a discharge cell C1 in which wall charges are formed in the dielectric layer 12 in the facing portion) and a non-light emitting cell (wall charges in the dielectric layer 12 in the facing portion). Are discharged on the panel surface in correspondence with the image data of the video signal.

  Thereafter, a sustain pulse is alternately applied to the row electrodes X1 and Y1 of each row electrode pair (X1, Y1), and a discharge gap g1 is formed between the transparent electrodes X1a and Y1a in the light emitting cell. A sustain discharge is generated through the.

  In the light emitting cell, the sustain discharge generates vacuum ultraviolet rays from xenon in the discharge gas sealed in the discharge space, and the red, green, and blue phosphor layers 16 in the light emitting cells are generated by the vacuum ultraviolet rays. Is excited to generate visible light, whereby a matrix display image is formed on the panel surface.

  In this PDP 10, the width Wx1 in the column direction of each row electrode X1 and the width Wy1 in the column direction of the transparent electrode Y1 are set to 150 μm or less, respectively, in a discharge gas having a total pressure of 66.7 kPa (500 Torr) in the discharge space. Is set to 6.67 kPa (50 Torr) or more, high luminous efficiency can be obtained for the following reasons during the sustain discharge as described above during image formation. .

  That is, FIG. 4 shows the relationship between the width in the column direction of the row electrodes in the PDP (hereinafter abbreviated as electrode width) and the light emission efficiency.

  FIG. 4 shows 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 xenon partial pressure is less than 6.67 kPa (50 Torr) (in FIG. 4, the case where the xenon partial pressure is 2.67 kPa (20 Torr) is shown), the electrode width becomes smaller. Luminous efficiency is reduced.

  When the xenon partial pressure becomes 6.67 kPa (50 Torr) or more, the light emission efficiency increases as the electrode width decreases, and as the xenon partial pressure increases (in FIG. 4, the xenon partial pressure is 13.33 kPa ( In the case of 100 Torr), the increase in luminous efficiency becomes remarkable.

  As the luminous efficiency required in the PDP, a value of 2.0 (lm / W) or more is a useful value.

  Therefore, from FIG. 4, in the PDP 10, when the xenon partial pressure in the discharge gas is set to 6.67 kPa (50 Torr) or more, the electrode widths Wx1 and Wy1 of the row electrodes X1 and Y1 are 150 μm or less, respectively. Thus, it can be seen that a light emission efficiency of 2.0 (lm / W) or more can be obtained.

  Thus, in the state where the xenon partial pressure in the discharge gas having a total pressure of 66.7 kPa (500 Torr) is 6.67 kPa (50 Torr) or more, the luminous efficiency increases as the electrode width decreases. by.

  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 during 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, the initial glow discharge period is a cathode descending portion formed mainly by ions in the vicinity of 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 part, and a large amount of high energy electrons are generated by this strong electric field, Although a large amount of vacuum ultraviolet rays are generated in the negative glow part, energy loss occurs in the cathode descending part, so that the generation efficiency of vacuum ultraviolet rays is not high compared to 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, since the electrode widths Wx1 and Wy1 of the row electrodes X1 and Y1 are set to 150 μm or less and the depth at which the sustain discharge expands in the discharge cell C1 is narrower than that of the conventional PDP, The growth region 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 this narrow depth discharge overlaps with the generation region of the initial glow discharge of FIG. 6 where vacuum ultraviolet rays are generated with very high efficiency as described above.

  For this reason, in the 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, similarly to the conventional case, a discharge gas having a low xenon partial pressure is sealed in the discharge space, and the phosphor layer is mainly formed by resonance lines having a wavelength of 147 nm of vacuum ultraviolet rays generated from xenon in the discharge gas. When the excitation 16 is excited, the sustain discharge, which is a narrow-depth discharge generated in the PDP 10, is localized in the vicinity of the discharge gap g1, and thus reaches the phosphor layer 16 of the vacuum ultraviolet resonance line. Attenuation until the end is 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 attenuates to almost half while traveling 100 μm in the discharge gas under the condition that the xenon partial pressure is 2.67 to 3.33 kPa (20 to 25 Torr).

  In the PDP 10, since the partial pressure of xenon 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 is mainly formed by a molecular beam having a wavelength of 172 nm. Excitation of the layer 16 takes place.

  The molecular beam of this vacuum ultraviolet ray hardly attenuates in the process of traveling in the discharge gas like the resonance line.

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

  Next, the relationship between the relative permittivity of the dielectric layer 12 and the relationship between the discharge current and the relative permittivity in the PDP 10 that performs the narrow depth discharge as described above and is filled with the discharge gas having a high xenon partial pressure will be described. I do.

  FIG. 7 shows a PDP in which an electrode width is set to 50 μm, a xenon partial pressure in a discharge gas with a total pressure of 66.7 kPa (500 Torr) is set to 13.33 kPa (100 Torr), and a narrow depth discharge is performed. FIG. 8 is a table showing the relationship between the relative dielectric constant of the dielectric layer covering the electrode pair, the discharge current (current density), and the light emission efficiency. FIG. 8 is a graph showing the table of FIG. is there.

  FIG. 9 shows a discharge current (current density) in a conventional PDP in which the electrode width is set to 200 μm and the xenon partial pressure in the discharge gas with a total pressure of 66.7 kPa (500 Torr) is set to 2.67 kPa (20 Torr). ) And the luminous efficiency.

  7 to 9, the sustain pulse period used for the measurement is 5 μs, i represents the discharge current (current density), and η represents the luminous efficiency. .

  Between the discharge current (current density) at the time of sustain discharge in the PDP and the relative dielectric constant of the dielectric layer covering the row electrode pair, the higher the relative dielectric constant of the dielectric layer, the higher the discharge current. In the conventional PDP shown in FIG. 9, the light emission efficiency increases as the discharge current increases.

On the other hand, in the PDP in which the narrow depth discharge shown in FIG. 8 is performed and the discharge gas having a high xenon partial pressure is sealed, the relative dielectric constant of the dielectric layer covering the row electrode pair is reduced, and the discharge current is reduced. Accordingly, the luminous efficiency increases, and when the discharge current becomes 1.0 A / m ² or less, the luminous efficiency is stabilized at about 4 lm / W.

  The phenomenon in which the luminous efficiency increases as the discharge current decreases as described above occurs in a PDP in which a narrow depth discharge is performed and a discharge gas having a high xenon partial pressure is enclosed, and as described above, does not occur in the conventional PDP. .

  In a PDP, it is usually preferable that the maximum light emission efficiency and the effective light emission efficiency be approximately equal, but it is preferable that at least the effective light emission efficiency be 90% or more of the maximum light emission efficiency.

Accordingly, from FIGS. 7 and 8, in the PDP 10, in order to obtain a value of 90% or more of the maximum luminous efficiency of 4 lm / W, that is, an effective luminous efficiency of 3.6 lm / W or more, the discharge current (current density) is 1. 16A / m ² is set to be less than the value, for this purpose, the dielectric constant of the dielectric layer 12 is 9.3 is set to be the following values.

Furthermore, in this PDP 10, in order for the effective light emission efficiency to be approximately equal to the maximum light emission efficiency of 4 lm / W, it is necessary to set the discharge current (current density) to a value of 1 A / m ² or less. For this reason, it is preferable to set the relative dielectric constant of the dielectric layer 12 to a value of 8 or less.

  As described above, in a PDP that generates a narrow depth discharge and is filled with a discharge gas having a high xenon partial pressure, the relative permittivity and the discharge current (current density) of the dielectric layer covering the row electrode pair are reduced. Therefore, the luminous efficiency is increased for the following reasons.

  That is, as the relative dielectric constant covering the row electrode pair increases, the discharge current (current density) increases, and the amount of ionization during the sustain discharge generated between the row electrodes increases. The probability of exciting and destroying the excited xenon atoms that enter the starting state of the vacuum ultraviolet light radiation due to the collision reaction with the electrons increases.

  In particular, in a PDP that generates a narrow-depth discharge such as the PDP 10 and in which a discharge gas having a high xenon partial pressure is enclosed, when the discharge current (current density) increases, the excitation breakdown of the excited xenon atoms as described above causes a vacuum. Since the generation efficiency of the ultraviolet light is deteriorated, the light emission efficiency is lowered by reducing the amount of vacuum ultraviolet light applied to the phosphor layer.

  Therefore, in a PDP that generates a narrow depth discharge and is filled with a discharge gas having a high xenon partial pressure, it is considered that the light emission efficiency is increased by decreasing the discharge current.

  As described above, in the 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 xenon partial pressure in the discharge gas is set to 6.67 kPa (50 Torr) or more. By setting the relative dielectric constant of the dielectric layer 12 covering the row electrode pair (X1, Y1) to 9.3 or less, preferably 8 or less, the amount of ionization during the sustain discharge is suppressed, and this is generated by this ionization. The probability that the excited electrons will excite and destroy the excited xenon atom, which is the starting state of vacuum ultraviolet light radiation by the collision reaction with this electron, will improve the vacuum ultraviolet generation efficiency and irradiate the phosphor layer. As the amount of vacuum ultraviolet light increases, the luminous efficiency is improved.

  Further, in the PDP 10, the dielectric layer 12 is made of a low dielectric material having a relative dielectric constant of 9.3 or less, so that the dielectric layer is made of a dielectric material having a relative dielectric constant larger than this. Compared with the conventional PDP having the above, the capacitance between the row electrodes X1 and Y1 and between the row electrode Y1 and the column electrode D1 is reduced, and the generation of reactive power is reduced.

  Further, in a PDP in which a discharge gas having a high xenon partial pressure is enclosed, the discharge current increases as the drive voltage increases. In the PDP 10, however, the xenon partial pressure in the discharge gas is 6.67 kPa ( Even when it is set to 50 Torr or higher, the dielectric layer 12 is formed of a low dielectric material having a relative dielectric constant of 9.3 or less, thereby preventing the discharge current from being reduced and the light emission efficiency from being lowered. Is done.

  Next, the reason why the film thickness of the dielectric layer 12 of the PDP 10 is set to 35 μm or more will be described with reference to FIGS.

  FIG. 10 is a graph showing the relationship between the normalized dielectric film thickness and the normalized dielectric capacitance, and FIG. 11 shows the rate of change of the normalized dielectric capacitance with respect to the normalized dielectric film thickness (of the graph of FIG. 10). It is a graph which shows an inclination (differential value).

And the normalized dielectric capacitance Cr in FIGS.
Cr = εr · ε0 (S / d)
εr: relative dielectric constant
ε0: dielectric constant of vacuum
S: electrode area
d: It is calculated | required by the type | formula of dielectric material film thickness.

  10 and 11 show the calculation of the dielectric capacitance based on the above formula for the numerical range of the film thickness of several tens of μm of the dielectric layer generally formed in the PDP. is there.

  From the above equation, the normalized dielectric capacitance Cr is inversely proportional to the dielectric film thickness only, and decreases as the dielectric film thickness increases, as shown in FIGS.

  Here, as can be seen from FIGS. 10 and 11, when the dielectric film thickness is smaller than 35 μm, the decrease rate of the dielectric capacitance accompanying the increase in the dielectric film thickness is large.

  On the other hand, when the dielectric film thickness is 35 μm or more, the decrease rate of the dielectric capacitance accompanying the increase in the dielectric film thickness is smaller than that when the dielectric film thickness is smaller than 35 μm.

  As described above, in the PDP, there is a correlation between the discharge current and the light emission efficiency. In the PDP in which the discharge gas having a high xenon partial pressure is performed by performing the narrow depth discharge, the light emission occurs when the value of the discharge current becomes small. Increases efficiency.

  For this reason, when the discharge current varies from discharge cell to discharge cell, there arises a problem that the light emission efficiency varies from discharge cell to discharge cell.

  This discharge current varies depending on the dielectric capacitance of the dielectric layer, and this dielectric capacitance varies depending on the dielectric film thickness as described above.

  In the manufacturing process of the PDP, it is difficult to form a dielectric layer having a uniform thickness in all the discharge cells, and a certain degree of variation occurs in the thickness of the dielectric layer.

  At this time, as described above, when the thickness of the dielectric layer is 35 μm or more, the change rate of the dielectric capacitance with respect to the change of the film thickness is smaller than that when the thickness is smaller than 35 μm. When the layer is formed to have a thickness of 35 μm or more, the variation in the discharge current caused by the variation in the film thickness for each discharge cell is reduced, thereby reducing the variation in the luminous efficiency between the discharge cells as compared with the conventional PDP. It is possible to manufacture a PDP that can be kept small and can obtain stable light emission efficiency over the entire surface of the panel.

  The above effects can also be obtained when the PDP barrier ribs are striped. However, the PDP 10 has the phosphor layer 16 formed into a substantially lattice shape so that the phosphor layer 16 has each shape. Since it is also formed on the four side surfaces of the horizontal wall 15A and the vertical wall 15B that respectively surround the discharge cell C1, and the surface area of the phosphor layer 16 is increased, higher luminous efficiency can be obtained.

  Further, in the PDP 10, the width of the row electrodes X1 and Y1 in the column direction is significantly smaller than that of the conventional PDP, so that the capacitance formed between the electrodes is greatly reduced. The generation of reactive current can be reduced to reduce the power consumption, and the recess 12A is formed in the dielectric layer 12 in the portion facing the discharge gap g1, so that it is formed between the electrodes. Since the generated capacitance is reduced and the generation of reactive current is reduced, power consumption can be reduced.

  In the above description, an example is shown in which 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. (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.

  That is, in the conventional PDP, as described above, since the sustain discharge is a deep discharge that spreads over the entire discharge cell, the row electrode pair discharges in the column direction with respect to the discharge cell partitioned by the grid-shaped barrier ribs. If the discharge gap is located at a position that is shifted up or down from the center position of the cell, the discharge gap is located on either the upper or lower horizontal wall of the partition wall that divides the discharge cell. Since variations occur in the voltage margin, brightness, light emission efficiency, etc., and the light emission is adversely affected, high positional accuracy of the row electrode pair is required for the discharge cell.

  However, in the PDP 10 described above, the sustain discharge becomes a narrow depth discharge with a narrow discharge region as described above, and the generation region of vacuum ultraviolet rays becomes a so-called point light source smaller than that of the conventional PDP. Since the phosphor layer 16 is excited by using a molecular beam having a wavelength of 172 nm, which is less susceptible to the influence of vacuum ultraviolet rays and absorbs less vacuum ultraviolet rays, a sustain discharge discharge region (vacuum ultraviolet ray generation region) and phosphor The influence of the variation in the distance to the layer 16 is reduced, so that even when the column-direction position of the row electrode pair (X1, Y1) with respect to the discharge cell C1 is shifted from the center position, the light emission efficiency and the luminance change This is because it hardly occurs.

  Therefore, according to the PDP 10, even when the partition 15 has a substantially lattice shape and the periphery of the discharge cell C1 is surrounded by the horizontal wall 15A and the vertical wall 15B, the position of the discharge gap (that is, the position of the row electrode pair). ) May not be accurately positioned at the center position of the discharge cell in the column direction, and the tolerance of the positional accuracy of the row electrode pair (X1, Y1) with respect to the discharge cell C1 increases, and the product in the manufacturing process It becomes possible to contribute to the reduction of the manufacturing cost due to the improvement of the yield.

  Also, in the above, an example is shown in which the transparent electrodes constituting the row electrodes are each formed into a continuous strip shape between adjacent discharge cells along the bus electrodes. A configuration may be employed in which each cell is formed independently and connected to the bus electrode.

  Furthermore, in the above, the example in which the row electrode is configured by the transparent electrode and the bus electrode has been described. However, the row electrode is configured only by the metal bus electrode, and the width in the column direction is set to 150 μm or less. But you can.

  12 and 13 show a second example of the embodiment of the PDP according to the present invention. FIG. 12 is a front view schematically showing a part of the PDP in the second example, and FIG. It is sectional drawing in line V2-V2.

  12 and 13, the same reference numerals as those in FIGS. 2 and 3 are assigned to the same components as those in the PDP of the first embodiment described above.

  Whereas the bus electrode of each row electrode constituting the row electrode pair of the PDP of the first embodiment described above is disposed at substantially the center of the back surface of the transparent electrode, the PDP 20 of the second embodiment has the row electrode pair. Transparent electrodes X2a, Y2a positioned at positions where the row electrodes X2 and Y2 constituting (X2, Y2) face the central portion in the column direction of the discharge cell C1 partitioned by the substantially lattice-shaped barrier ribs 15, respectively. The bus cells X2b and Y2b are disposed at positions close to the lateral walls 15A on both sides of the discharge cell C1 and connected to the transparent electrodes X2a and Y2a.

  That is, in FIGS. 12 and 13, in the PDP 20, as in the case of the first embodiment, the discharge space is partitioned into a substantially square shape by the partition walls 15 formed into a substantially lattice shape by the horizontal wall 15A and the vertical wall 15B. A discharge cell C1 is formed.

  The row electrodes X2 and Y2 constituting the row electrode pair (X2 and Y2) have a predetermined distance (discharge gap) between the strip-like transparent electrodes X2a and Y2a facing the central portion in the column direction of the discharge cell C1. g2) is opened and extends parallel to the row direction.

  The transparent electrodes X2a, Y2a are set so that the width (Wx2, Wy2) in the column direction is 150 μm or less.

  The bus electrodes X2b and Y2b are bus electrode main body portions X2b1 and Y2b1 extending in a strip shape in the row direction along the inner edge of the horizontal wall 15A of the partition wall 15, and the bus electrode main body portions X2b1 and Y2b1 and the transparent electrodes X2a and Y2a, respectively. Between the bus electrode main body portions X2b1 and Y2b1 and the transparent electrodes X2a and Y2a, the bus electrode connecting portions X2b2 and Y2b2 extend in the column direction at positions facing the vertical wall 15B of the partition wall 15 therebetween. .

  The dielectric layer 22 covering the row electrode pair (X2, Y2) is made of, for example, zinc oxide (ZnO) glass or a mixture of this zinc oxide (ZnO) glass and phosphorus oxide (P2O5) glass. A low dielectric material having a relative dielectric constant of 9.3 or less, preferably 8 or less, is formed so that the film thickness d2 in the direction perpendicular to the front glass substrate 11 is 35 μm or more.

  The structure of the other parts is the same as in the first embodiment, and the xenon partial pressure of the discharge gas with a total pressure of 66.7 kPa (500 Torr) sealed in the discharge space is 6.67 kPa or more (50 Torr) or more. Is set to a value.

  In the case of the first embodiment, since the bus electrode formed by the metal film is arranged at a position facing the central portion of the discharge cell, the opening of the discharge cell is formed by the non-light transmissive bus electrode. In the case of this PDP 20, the bus electrode main body portions X2b1 and Y2b1 of the bus electrodes X2b and Y2b formed by the metal film are positioned close to the horizontal wall 15A of the partition wall 15 while being divided into two in the column direction. Therefore, the opening of the discharge cell C1 is not bisected by the bus electrodes X2b and Y2b as in the first embodiment.

In the case of this example, there is a characteristic that the light emission intensity increases as it approaches the discharge gap, and the light emission intensity decreases as it approaches the horizontal wall. Therefore, in the case of this configuration, higher luminous efficiency can be obtained without shielding the portion with high emission intensity by the bus electrode.
Further, in this PDP 20, since the bus electrode connection portions X2b2 and Y2b2 are arranged at positions facing the vertical walls 15B of the partition walls 15, the formation of the bus electrode connection portions X2b2 and Y2b2 results in the opening of the discharge cell C1. A part of is not shielded.

  In the above, an example is shown in which the bus electrode main body portions X2b1 and Y2b1 of the bus electrodes X2b and Y2b are disposed at positions close to the horizontal wall 15A of the partition wall 15 in a portion facing the discharge cell C1. The bus electrode main body portions X2b1 and Y2b1 may be disposed at a position facing the horizontal wall 15A of the partition wall 15. In this case, the bus electrode main body portions X2b1 and Y2b1 shield the opening of the discharge cell C1. Therefore, there is no possibility that the entire bus electrodes X2b and Y2b interfere with light emission from the phosphor layer.

  The PDP 20 is configured such that the column-direction width (electrode width) Wx2 of the transparent electrode X2a of the row electrodes X2 and Y2 and the column-direction width (electrode width) Wy2 of the transparent electrode Y2a are set to 150 μm or less, respectively. As in the case of the embodiment, the sustain discharge generated between the transparent electrodes X2a and Y2a becomes a narrow depth discharge, and the generation of vacuum ultraviolet rays is performed with a very high efficiency compared to the conventional PDP. In addition, since the xenon partial pressure in the discharge gas sealed in the discharge space is set to 6.67 kPa (50 Torr) or more, the vacuum ultraviolet ray generated from the xenon in the discharge gas is mostly attenuated. Since the phosphor layer 16 is excited by a molecular beam having a wavelength of 172 nm, a higher luminous efficiency can be obtained compared to the conventional PDP. So as to.

  In the PDP 20, as in the case of the first embodiment, the dielectric layer 22 covering the row electrode pair (X2, Y2) is formed of a low dielectric material having a relative dielectric constant of 9.3 or less. Therefore, in a PDP in which a discharge gas with a high xenon partial pressure is sealed with a narrow depth discharge, the amount of vacuum ultraviolet light irradiated onto the phosphor layer by suppressing the amount of ionization during the sustain discharge and improving the vacuum ultraviolet ray generation efficiency Is increased, the light emission efficiency is improved, and further, the thickness of the dielectric layer 22 is set to 35 μm or more, so that the thickness d2 of the dielectric layer 22 for each discharge cell C1 varies. The variation in the generated discharge current is reduced, and as a result, the variation in the light emission efficiency for each discharge cell C1 becomes smaller than that of the conventional PDP, and stable emission over the entire surface of the panel. It becomes possible to manufacture a PDP which can be obtained efficiently.

  The above effect can also be obtained when the PDP barrier ribs are striped. However, the PDP 20 has a phosphor layer formed in each discharge cell by forming the barrier ribs 15 in a substantially lattice shape. Since the surface area of the phosphor layer can be increased by forming also on the four side surfaces of the horizontal wall 15A and the vertical wall 15B surrounding C1, respectively, higher luminous efficiency can be obtained.

  Further, in the PDP 20, the width of the row electrodes X2 and Y2 in the column direction of the transparent electrodes X2a and Y2a is significantly smaller than that of the conventional PDP, so that the capacitance formed between the electrodes can be reduced. As a result, the generation of reactive current is reduced and the power consumption can be reduced.

  Further, for the same reason as described in the first embodiment, the PDP 20 arranges the row electrode pair (X2, Y2) at a position shifted vertically from the center position in the column direction with respect to the discharge cell C1. This increases the allowable amount of positional accuracy of the row electrode pair (X2, Y2) with respect to the discharge cell C1, thereby contributing to a reduction in manufacturing cost due to an improvement in product yield in the manufacturing process. become able to do.

  In the above, an example is shown in which the transparent electrodes constituting the row electrodes are each formed into a continuous strip shape between adjacent discharge cells along the bus electrodes. A configuration may be employed in which each cell is formed independently and connected to the bus electrode.

  14 and 15 show a third example of the embodiment of the present invention. FIG. 14 is a front view schematically showing a part of the PDP of the third example. FIG. It is sectional drawing in line V3-V3.

  14 and 15, the same reference numerals as those in FIGS. 2 and 3 are assigned to the same components as those in the PDP of the first embodiment described above.

  The PDP of the first embodiment described above is configured such that the sustain discharge forms a narrow depth discharge by changing the width in the column direction of the transparent electrode of each row electrode. A row electrode pair (X3, Y3) of the same size as the conventional PDP (see FIG. 1) is formed at a position facing the discharge cell C1 partitioned by the substantially lattice-shaped barrier ribs 15, and this row electrode pair (X3 , Y3), a second dielectric layer 33 is further laminated and formed at a required position on the back side facing the discharge space of the first dielectric layer 32 covering the first and second electrodes X3, Y3. The width in the column direction of the portion that generates the discharge is narrowed, so that the sustain discharge forms a narrow depth discharge.

  That is, the PDP 30 has strip-like transparent electrodes X3a and Y3a having a width in the column direction of 400 to 1000 μm, for example, similar to the conventional PDP of FIG. The strip-shaped bus electrodes X3b and Y3b are formed to extend in the row direction on the base end side of the back surfaces of the transparent electrodes X3a and Y3a, respectively, so that the transparent electrodes X3a and Y3a It is connected to the.

  The row electrode pair (X3, Y3) is covered with a first dielectric layer 32 formed on the back surface of the front glass substrate 11.

  The first dielectric layer 32 has a relative dielectric constant of 9.3 or less, such as zinc oxide (ZnO) glass or a mixture of this zinc oxide (ZnO) glass and phosphorus oxide (P2O5) glass, preferably The film thickness d3 in the direction perpendicular to the front glass substrate 11 is made of a low dielectric material of 8 or less so as to be 35 μm or more.

  A second dielectric layer 33 is laminated and formed at a required position as described below on the back surface of the first dielectric layer 32.

  A secondary electron emission layer (not shown) is formed so as to cover the entire back surfaces of the first dielectric layer 32 and the second dielectric layer 33.

  The second dielectric layer 33 is arranged in the column direction from the discharge gap g3 on the back surface of the first dielectric layer 32 and the transparent electrodes X3a and Y3a of the row electrodes X3 and Y3 facing each other with the discharge gap g3 interposed therebetween. In FIG. 1, the portion is formed so as to cover a portion other than the strip-shaped portion extending in the row direction facing the portions of widths Wx3 and Wy3 of 150 μm or less.

  The first dielectric layer 32 covering the row electrode pair (X3, Y3) is formed so that the film thickness d3 in the direction perpendicular to the front glass substrate 11 is 35 μm or more, and the second dielectric layer 33 is formed. Has a thickness equal to or greater than that of the first dielectric layer 32, and the thickness of the portion where the first dielectric layer 32 and the second dielectric layer 33 are laminated is the thickness of the first dielectric layer 32. It is set so that the film thickness is such that almost no wall charges are formed by the discharge of twice or more of the above.

  A discharge gas having a total pressure of 66.7 kPa (500 Torr) having a xenon partial pressure of 6.67 kPa (50 Torr) or more is sealed in the discharge space.

  In the PDP 30, each row electrode X3, Y3 of the row electrode pair (X3, Y3) has the same width in the column direction as the conventional PDP, but the discharge gap g3 of this row electrode X3, Y3. The two dielectric layers of the first dielectric layer 32 and the second dielectric layer 33 in which the portions other than the portions of the widths Wx3 and Wy3 in the column direction at the front end portions of the transparent electrodes X3a and Y3a facing each other are stacked. Since the film thickness of the dielectric layer covered by the body layer is larger than the film thickness of the dielectric layer covering the width Wx3 and Wy3 portions in the column direction of the tip portion, the wall charge Is hardly formed in the portion where the second dielectric layer 33 is laminated on the first dielectric layer 32 and the film thickness is increased, and the widths Wx3 and Wy3 in the column direction of the tip portions of the transparent electrodes X3a and Y3a are formed. Of the first dielectric layer 32 covering the portion of It is formed on the surface.

  Therefore, in the PDP 30, when a sustain pulse is applied to the row electrode pair (X3, Y3) and a sustain discharge is generated between the transparent electrodes X3a and Y3a via the discharge gap g3, the sustain discharge is almost This is performed only at the width Wx3 and Wy3 portions in the column direction of the tip portions of the transparent electrodes X3a and Y3a, and the narrow depth discharge as described in the first embodiment is formed.

  As described above, in the PDP 30, as in the case of the first embodiment, the sustain discharge becomes a narrow depth discharge, so that the generation of vacuum ultraviolet rays is performed with a much higher efficiency than the conventional PDP. And the xenon partial pressure in the discharge gas having a total pressure of 66.7 kPa (500 Torr) sealed in the discharge space is set to 6.67 kPa (50 Torr) or more, so that the xenon in the discharge gas is reduced. Among the generated vacuum ultraviolet rays, the phosphor layer is excited mainly by a molecular beam having a wavelength of 172 nm with almost no attenuation, so that higher luminous efficiency can be obtained as compared with the conventional PDP.

  In the PDP 30, as in the first embodiment, the first dielectric layer 32 covering the row electrode pair (X3, Y3) is formed of a low dielectric material having a relative dielectric constant of 9.3 or less. Therefore, in a PDP in which a discharge gas with a high xenon partial pressure is sealed with a narrow depth discharge, the amount of ionization during the sustain discharge is suppressed, and the vacuum irradiated to the phosphor layer by improving the vacuum ultraviolet ray generation efficiency The luminous efficiency is improved by increasing the amount of ultraviolet light, and the first dielectric layer 32 for each discharge cell C1 is set by setting the film thickness d3 of the first dielectric layer 32 to 35 μm or more. The variation in the discharge current caused by the variation in the film thickness d3 is reduced, and thereby the variation in the light emission efficiency for each discharge cell C1 is smaller than that in the conventional PDP. Over the surface it becomes possible to manufacture a PDP which can obtain a stable emission efficiency.

  Further, in this PDP 30, for the same reason as described in the first embodiment, the row electrode pair (X3, Y3) is arranged at a position shifted vertically from the center position in the column direction with respect to the discharge cell C1. As a result, the tolerance of the positional accuracy of the row electrode pair (X3, Y3) with respect to the discharge cell C1 is increased, which contributes to a reduction in manufacturing cost due to an improvement in product yield in the manufacturing process. become able to do.

  Further, in addition to the same effects as in the first embodiment, the PDP 30 has the same width in the column direction of the transparent electrodes X3a and Y3a as the conventional PDP. Since X3b and Y3b are arranged at positions away from the discharge gap g3, the influence that the light emission from the phosphor layer is obstructed by the bus electrodes X3b and Y3b made of a metal film is reduced, and the light emission extraction efficiency is improved. .

That is, in the case of this example, there is a characteristic that the light emission intensity increases as it approaches the discharge gap and decreases as it approaches the horizontal wall. Therefore, in the case of this configuration, higher luminous efficiency can be obtained without shielding the portion with high emission intensity by the bus electrode.
According to the configuration of the PDP 30, the structure for reducing the influence of the bus electrode on the light emission from the phosphor layer can be simplified as compared with the PDP of the second embodiment described above.

  For example, FIGS. 14 and 15 show an example in which the bus electrodes X3b and Y3b are disposed at positions facing the opening surface of the discharge cell C1, but as shown in FIG. If the bus electrodes X4b, Y4b of the row electrodes X4, Y4 constituting (X4, Y4) are arranged at positions deviated from the opening surface of the discharge cell C1, the bus electrodes X4b, Y4b from the phosphor layer The influence on the light emission is eliminated, and the light extraction efficiency can be greatly improved.

  Further, the PDP 30 has the same configuration of the row electrode pair (X3, Y3) as that of the prior art, so that the manufacturing process is not significantly changed, and the formation position of the second dielectric layer 33 is arbitrarily set. As a result, the degree of freedom in design and manufacturing is increased, thereby making it possible to reduce the manufacturing cost and contribute to the product yield.

  In the above, an example is shown in which the transparent electrodes constituting the row electrodes are each formed into a continuous strip shape between adjacent discharge cells along the bus electrodes. A configuration may be employed in which each cell is formed independently and connected to the bus electrode.

  In the above, an example is shown in which the second dielectric layer is formed in a strip shape extending in the row direction, but the second dielectric layer stacked on the first dielectric layer is shown in FIG. The second dielectric layer 34 shown in FIG. 2 is formed into a substantially lattice shape in which a rectangular opening 34a is formed in a portion facing the opening surface of the discharge cell C1, and the transparent electrode is formed by the opening 34a. The film thickness of the dielectric layer covering the portions other than the portions in the column direction widths Wx3 and Wy3 and the portions facing the discharge gap g3 at the tip portions of X3a and Y3a is set to a thickness at which no wall charges are formed. You may make it do.

  18 and 19 show a fourth example of the embodiment of the present invention. FIG. 18 is a front view schematically showing a part of the PDP of the fourth example, and FIG. It is sectional drawing in line V4-V4.

  18 and 19, the same reference numerals as those in FIGS. 14 and 15 are given to the same components as those of the PDP of the third embodiment described above.

  The PDP of the third embodiment described above forms a narrow depth discharge by limiting the discharge range of the sustain discharge by the second dielectric layer formed on the first dielectric layer covering the row electrode pair. In contrast to this, the PDP 40 of the fourth embodiment has a row electrode of the same size as the conventional PDP (see FIG. 1) at a position facing the discharge cell C1 defined by the substantially lattice-shaped barrier ribs 15. The pair (X3, Y3) is formed, and the secondary electron emission layer 43 is extended in a strip shape in the row direction by a high γ material such as MgO only at a required position on the back side of the dielectric layer 42 facing the discharge space. With this secondary electron emission layer 43, the sustain discharge generated between the transparent electrodes X3a and Y3a forms a narrow depth discharge.

  That is, in the PDP 40, strip-like transparent electrodes X3a and Y3a having a width in the column direction of 400 to 1000 μm, for example, similar to the conventional PDP of FIG. 1 are arranged on the back surface of the front glass substrate 11 with a required distance (discharge gap g4). The strip-shaped bus electrodes X3b and Y3b are formed to extend in the row direction on the base end side of the back surfaces of the transparent electrodes X3a and Y3a, respectively, so that the transparent electrodes X3a and Y3a It is connected to the.

  The row electrode pair (X3, Y3) is covered with a dielectric layer 42 formed on the back surface of the front glass substrate 11.

  The dielectric layer 42 covering the row electrode pair (X3, Y3) is made of, for example, a dielectric such as zinc oxide (ZnO) glass or a mixture of the zinc oxide (ZnO) glass and phosphorus oxide (P2O5) glass. A low dielectric material with a rate of 9.3 or less, preferably 8 or less, is formed so that the film thickness d4 in the direction perpendicular to the front glass substrate 11 is 35 μm or more.

  Then, on the back surface of the dielectric layer 42, the portion including the width Wx4 and the width Wy4 in the column direction of the discharge gap g4 and the respective distal end portions of the transparent electrodes X3a and Y3a located on both sides of the discharge gap g4 A secondary electron emission layer 43 extending in a strip shape in the row direction is formed only by a position opposite to the high γ material such as MgO.

  As a method for forming the secondary electron emission layer 43, for example, a mask having an opening corresponding to the formation position of the secondary electron emission film 43 is interposed between the dielectric layer 42 and the material evaporation source of the high γ material. Then, there is a method of forming a film by attaching a vapor of high γ material generated from a material evaporation source to a portion of the dielectric layer 42 facing the opening of the mask.

  The widths Wx4 and Wy4 in the column direction of the portion of the secondary electron emission layer 43 facing the transparent electrodes X3a and Y3a are set to 150 μm or less.

  The xenon partial pressure of the discharge gas with a total pressure of 66.7 kPa (500 Torr) sealed in the discharge space is set to 6.67 kPa (50 Torr) or more.

  In the PDP 40, each of the row electrodes X3, Y3 of the row electrode pair (X3, Y3) has the same width as that of the conventional PDP in the column direction, but secondary electrons formed of a high γ material. The emission layer 43 is disposed only at a position facing the discharge gap g4 on the dielectric layer 42 and the width Wx4 and Wy4 portions of the respective transparent electrode X3a and Y3a on both sides of the discharge gap g4. As a result, most of the sustain discharge generated between the transparent electrodes X3a and Y3a is generated within the region where the secondary electron emission layer 43 is formed. A narrow depth discharge as described in the first embodiment is formed.

  As described above, in the PDP 40, as in the case of the first embodiment, the sustain discharge becomes a narrow depth discharge, so that the generation of vacuum ultraviolet rays is performed with a very high efficiency compared to the conventional PDP. Since the xenon partial pressure in the discharge gas sealed in the discharge space is set to 6.67 kPa (50 Torr) or more, the vacuum ultraviolet ray generated from the xenon in the discharge gas is mainly attenuated. Since the phosphor layer is excited by a molecular beam having a wavelength of 172 nm with almost no light emission, it is possible to obtain higher luminous efficiency than the conventional PDP.

  In the PDP 40, as in the first embodiment, the dielectric layer 42 covering the row electrode pair (X3, Y3) is formed of a low dielectric material having a relative dielectric constant of 9.3 or less. Thus, in a PDP in which a discharge gas with a high xenon partial pressure is sealed with a narrow depth discharge, the amount of vacuum ultraviolet light irradiated to the phosphor layer by suppressing the amount of ionization during the sustain discharge and improving the vacuum ultraviolet ray generation efficiency Is increased, the light emission efficiency is improved, and further, the film thickness d4 of the dielectric layer 22 is set to 35 μm or more, so that the thickness of the dielectric layer 42 varies depending on the discharge cell C1. The variation in the generated discharge current is reduced, thereby making the variation in the luminous efficiency of each discharge cell C1 smaller than that in the conventional PDP, and over the entire surface of the panel. It becomes possible to manufacture a PDP which can be obtained boss was luminous efficiency.

  Further, in the PDP 40, the row electrode pair (X3, Y3) is disposed at a position shifted vertically from the center position in the column direction with respect to the discharge cell C1 for the same reason as described in the first embodiment. As a result, the tolerance of the positional accuracy of the row electrode pair (X3, Y3) with respect to the discharge cell C1 is increased, which contributes to a reduction in manufacturing cost due to an improvement in product yield in the manufacturing process. become able to do.

  Further, in addition to the same effect as in the first embodiment, the PDP 40 has the same width in the column direction of the transparent electrodes X3a and Y3a as the conventional PDP, and the bus electrode X3b. , Y3b are arranged at positions away from the discharge gap g4, the influence that the light emission from the phosphor layer is obstructed by the bus electrodes X3b, Y3b made of a metal film is reduced, and the light extraction efficiency is improved.

That is, in the case of this example, there is a characteristic that the light emission intensity increases as it approaches the discharge gap and decreases as it approaches the horizontal wall. Therefore, in the case of this configuration, higher luminous efficiency can be obtained without shielding the portion with high emission intensity by the bus electrode.
According to the configuration of the PDP 40, the structure for reducing the influence of the bus electrode on the light emission from the phosphor layer can be simplified as compared with the PDP of the second embodiment described above.

  Further, according to the configuration of this PDP 40, since the generation region of the narrow depth discharge is freely set according to the formation position and size of the secondary electron emission layer 43, the degree of freedom in design and manufacturing is increased, and the design change, etc. It is possible to respond flexibly to.

  In the above, an example in which the secondary electron emission layer 43 is formed in a shape extending in a strip shape in the row direction is shown, but this secondary electron emission layer is a so-called independent discharge cell C1. You may make it shape | mold into an island shape.

  Also, in the above, an example is shown in which the transparent electrodes constituting the row electrodes are each formed into a continuous strip shape between adjacent discharge cells along the bus electrodes. A configuration may be employed in which each cell is formed independently and connected to the bus electrode.

  In the PDPs of the above embodiments, 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 the front glass A discharge gas in which the partial pressure of xenon is set to 6.67 kPa or more is enclosed in the discharge space between the substrate and the rear glass substrate, and the dielectric layer covering the row electrode pair has a relative dielectric constant of 9 A PDP formed of a low dielectric material of 3 or less is an embodiment of the superordinate concept.

  The PDP according to the embodiment constituting this superordinate concept is the width in the column direction of the part involved in the discharge performed through the discharge gap between the row electrodes, among the constituent parts of the pair of row electrodes constituting the pair of 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 that overlaps with the generation region of the initial glow discharge.

  As a result, the PDP in this embodiment can generate vacuum ultraviolet rays from xenon in the discharge gas with a much higher efficiency than the conventional PDP.

  Furthermore, 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 out of vacuum ultraviolet rays generated from the xenon in the discharge gas. This molecular beam is hardly attenuated in the process of traveling in the discharge gas like the resonance line, so that the discharge generated between the row electrodes is localized in the vicinity of the discharge gap. Even in such a case, since the vacuum ultraviolet rays sufficiently reach the phosphor layer, the characteristic that vacuum ultraviolet rays are generated with high efficiency as compared with the conventional PDP is utilized as it is, and high luminous efficiency can be obtained. become able to do.

  The dielectric layer covering the row electrode pair has a relative dielectric constant of 9.3 or less, preferably 8 or less, for example, zinc oxide-based glass, or a mixture of zinc oxide-based glass and phosphorus oxide-based glass. In a PDP in which a narrow depth discharge is performed and a discharge gas having a high xenon partial pressure is sealed, the amount of ionization during the sustain discharge is suppressed and the vacuum ultraviolet ray generation efficiency is improved. Luminous efficiency can be improved by increasing the amount of vacuum ultraviolet light applied to the phosphor layer.

  In the PDP of this embodiment, the dielectric layer is preferably formed so as to have a film thickness of 35 μm or more in the direction perpendicular to the substrate. The variation in the generated discharge current is reduced, so that the variation in the light emission efficiency for each unit light emitting region is reduced, and a PDP capable of obtaining a stable light emission efficiency over the entire surface of the panel can be manufactured. Become.

It is a front view which shows the structure of the conventional PDP. It is a front view which shows the 1st Example of embodiment of this invention. It is sectional drawing in the V1-V1 line | wire of FIG. It is a grab which shows the relationship between the width | variety of the electrode in PDP, and luminous efficiency. It is a grab showing a general growth process of electric 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 table | surface figure which shows the relationship between the discharge current in the PDP which carried out the narrow depth discharge, and the discharge gas of the high xenon partial pressure was enclosed, luminous efficiency, and the non-dielectric constant of a dielectric material. It is a graph which shows the relationship between the discharge current in FIG. 7, luminous efficiency, and the non-dielectric constant of a dielectric material. It is a graph which shows the relationship between the discharge current in the conventional PDP, luminous efficiency, and the non-dielectric constant of a dielectric material. It is a graph which shows the relationship between the dielectric material film thickness in PDP, and a dielectric capacitance. It is a graph which shows the relationship between the dielectric material film thickness in PDP, and the change rate of dielectric capacity. It is a front view which shows the 2nd Example of embodiment of this invention. It is sectional drawing in the V2-V2 line | wire of FIG. It is a front view which shows the 3rd Example of embodiment of this invention. It is sectional drawing in the V3-V3 line | wire of FIG. It is a front view which shows the modification of the Example. It is a front view which shows the other modification of the Example. It is a front view which shows the 4th Example of embodiment of this invention. It is sectional drawing in the V4-V4 line | wire of FIG.

Explanation of symbols

11: Front glass substrate (one substrate)
12, 22, 42 ... dielectric layer
13 ... Back glass substrate (the other substrate)
15 ... partition wall 15A ... horizontal wall (horizontal wall part)
15B ... Vertical wall (vertical wall)
16 ... phosphor layer 32 ... first dielectric layer (dielectric layer)
33, 34 ... second dielectric layer (dielectric layer)
34a ... opening 43 ... secondary electron emission layer C1 ... discharge cell (unit emission region)
D1 ... column electrode X1, Y1, X2, Y2, X3, Y3, X4, Y4
... Row electrodes Xa1, Ya1, Xa2, Ya2, Xa3, Ya3, Xa4, Ya4
... Transparent electrodes Xb1, Yb1, Xb2, Yb2, Xb3, Yb3, Xb4, Yb4
... Bus electrode X2b1, Y2b1 ... Bus electrode body part X2b2, Y2b2 ... Bus electrode connection part Wx1, Wy1, Wx2, Wy2, Wx3, Wy3, Wx4, Wy4
... Width in the column direction d1, d2, d3, d3 ... Film thickness g1, g2, g3, g4 ... Discharge gap

Claims (22)

A pair of substrates opposed to each other with the discharge space interposed therebetween, and arranged on one substrate 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 constituted by paired row electrodes, a dielectric layer formed on 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, unit emission regions are formed in the discharge spaces where the column electrodes intersect with the row electrode pairs, and a discharge gas containing xenon is sealed in the discharge spaces. In plasma display panels,
The width in the column direction of the pair of row electrodes constituting the row electrode pair is set to 150 μm or less,
The partial pressure of xenon in the discharge gas is set to 6.67 kPa or more,
The dielectric layer is formed of a dielectric material having a relative dielectric constant of 9.3 or less;
A plasma display panel characterized by that.   The plasma display panel according to claim 1, wherein a dielectric constant of a dielectric material forming the dielectric layer is 8 or less.   The plasma display panel according to claim 1, wherein the dielectric material forming the dielectric layer is zinc oxide-based glass or a mixture of zinc oxide-based glass and phosphorus oxide-based glass.   The plasma display panel according to claim 1, wherein the dielectric layer has a thickness of 35 μm or more in a direction perpendicular to the substrate. Each of the row electrodes constituting the row electrode pair has a required width in the column direction and is opposed to the other row electrode side that is paired via the discharge gap. A metal bus electrode having a small width in the column direction and extending in a strip shape in the row direction and connected to the transparent electrode,
The plasma display panel according to claim 1, wherein a width in a column direction of the pair of transparent electrodes is set to 150 μm or less. Each row electrode constituting the row electrode pair is composed of metal bus electrodes facing each other with the other row electrode side having a required width in the column direction and being paired via a discharge gap,
The plasma display panel according to claim 1, wherein a width in a column direction of the pair of bus electrodes is set to 150 μm or less. Between the pair of substrates, a plurality of horizontal wall portions extending in parallel to the row direction and a plurality of vertical wall portions extending in parallel to the column direction are formed into barrier ribs formed in a substantially lattice shape, and the discharge spaces are formed by the barrier ribs. Is divided for each unit light emitting area,
The plasma display panel according to claim 1, wherein the row electrodes are respectively disposed at positions facing unit light emitting regions partitioned by the partition walls. Between the pair of substrates, a plurality of horizontal wall portions extending in parallel to the row direction and a plurality of vertical wall portions extending in parallel to the column direction are formed into barrier ribs formed in a substantially lattice shape, and the discharge spaces are formed by the barrier ribs. Is divided for each unit light emitting area,
6. The plasma display panel according to claim 5, wherein the transparent electrode of the row electrode is disposed at a position facing the unit light emitting region, and the bus electrode is disposed at a position facing the horizontal wall portion of the partition wall.   The transparent electrode and the bus electrode of each row electrode constituting the row electrode pair are connected to each other by a metal connection portion formed at a position facing the vertical wall portion of the partition wall and extending in the column direction. The plasma display panel as described. A pair of substrates opposed to each other with the discharge space interposed therebetween, and arranged on one substrate 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 constituted by paired row electrodes, a dielectric layer formed on 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, unit emission regions are formed in the discharge spaces where the column electrodes intersect with the row electrode pairs, and a discharge gas containing xenon is sealed in the discharge spaces. In plasma display panels,
The dielectric layer includes a thin film portion and a thick film portion having a thickness larger than that of the thin film portion. The thin film portion of the dielectric layer is a discharge gap of the pair of row electrodes. A dielectric layer covering a portion having a width of 150 μm or less in the column direction of the tip portion on the side,
The partial pressure of xenon in the discharge gas is set to 6.67 kPa or more,
At least a thin film portion of the dielectric layer is formed of a dielectric material having a relative dielectric constant of 9.3 or less,
A plasma display panel characterized by that.   The plasma display panel according to claim 10, wherein a relative dielectric constant of a dielectric material forming at least a thin film portion of the dielectric layer is 8 or less.   The plasma display panel according to claim 10, wherein a dielectric material forming at least a thin film portion of the dielectric layer is zinc oxide-based glass or a mixture of zinc oxide-based glass and phosphorus oxide-based glass.   The plasma display panel according to claim 10, wherein the thin film portion of the dielectric layer has a thickness of 35 μm or more in a direction perpendicular to the substrate.   The plasma display panel according to claim 10, wherein the thickness of the thick film portion of the dielectric layer is set to be approximately twice or more the thickness of the thin film portion of the dielectric layer.   The plasma display panel according to claim 10, wherein the thin film portion of the dielectric layer is formed in a strip shape extending in the row direction.   The plasma display according to claim 10, wherein the thin film portion of the dielectric layer is formed in an island shape for each unit light emitting region, and the thick film portion is formed in a substantially lattice shape surrounding the thin film portion. panel. Between the pair of substrates, a plurality of horizontal wall portions extending in parallel to the row direction and a plurality of vertical wall portions extending in parallel to the column direction are formed into barrier ribs formed in a substantially lattice shape, and the discharge spaces are formed by the barrier ribs. Is divided for each unit light emitting area,
The plasma display panel according to claim 10, wherein the row electrodes are respectively disposed at positions facing unit light emitting regions partitioned by the partition walls. Each of the row electrodes constituting the pair of row electrodes has a transparent electrode facing each other with the other row electrode side having a required width in the column direction and being paired via a discharge gap. A bus electrode made of metal having a small width in the column direction and extending in a strip shape in the row direction and connected to the transparent electrode,
Between the pair of substrates, a plurality of horizontal wall portions extending in parallel to the row direction and a plurality of vertical wall portions extending in parallel to the column direction are formed into barrier ribs formed in a substantially lattice shape, and the discharge spaces are formed by the barrier ribs. Is divided for each unit light emitting area,
The plasma display panel according to claim 10, wherein the bus electrode of each row electrode is disposed at a position facing the horizontal wall portion of the partition wall. A pair of substrates opposed to each other with the discharge space interposed therebetween, and arranged on one substrate 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 constituted by paired row electrodes, a dielectric layer formed on one substrate side to cover the row electrode pairs, and arranged on the other substrate side and extending in the column direction. A plurality of column electrodes arranged in parallel to each other, a unit emission region is formed in the discharge space where the column electrode and the row electrode pair intersect, and a discharge gas containing xenon is sealed in the discharge space. In the plasma display panel
A secondary electron emission layer is formed of a high γ material on a dielectric layer including a portion having a width of 150 μm or less in the column direction and a portion facing the discharge gap at the tip portion on the discharge gap side of each pair of row electrodes. Formed,
The partial pressure of xenon in the discharge gas is set to 6.67 kPa or more,
The dielectric layer is formed of a dielectric material having a relative dielectric constant of 9.3 or less;
A plasma display panel characterized by that.   The plasma display panel according to claim 19, wherein a dielectric constant of a dielectric material forming the dielectric layer is 8 or less.   The plasma display panel according to claim 19, wherein the dielectric material forming the dielectric layer is zinc oxide-based glass or a mixture of zinc oxide-based glass and phosphorus oxide-based glass.   The plasma display panel according to claim 19, wherein the dielectric layer has a thickness of 35 μm or more in a direction perpendicular to the substrate.

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