JP2011014450A - Plasma display device - Google Patents

Abstract

The present invention improves both the white display performance and the small display rate display performance.
In a PDP (plasma display panel) 1, a surface on which visible light for display is emitted is a display surface, a space in which visible light is emitted from the display surface is a viewing space, and a plurality of discharge cells are continuously formed. Is a display space Rp, and a region projected onto the display surface of the display space is a display region Rp. When white light is incident on the display region from the visual field space, the energy of light emitted from the display region If the average value in the display area of the ratio of the incident white light energy is the display area surface reflectance β, 0.02 ≦ β ≦ 0.2, and the X electrode of the dielectric (dielectric film) 26 The average value of the thickness at the position overlapping with 22-1 and 24-1 and the thickness at the position overlapping with the Y electrodes 23-1 and 25-1 is set to be 20 μm or less.
[Selection] Figure 2

Description

  The present invention relates to a technology of a plasma display device such as a plasma display panel and an image display system using the plasma display device, and in particular, is effective for providing a plasma display device having low power, high brightness, high contrast, and high image quality. Regarding technology.

  In recent years, a plasma display device has been expected as a large and thin color display device. In particular, an AC surface discharge type PDP (Plasma Display Panel) is the most practically used system because of its simplicity of structure and high reliability (for example, see Patent Document 1).

JP 2005-32478 A

  The plasma display device has a plasma display panel having at least a plurality of discharge cells as components, and forms plasma by discharge in the discharge cells, and forms visible light by the effect of the plasma to display an image. It is a device to perform. As a method of forming visible light by the effect of plasma, there are a method of using visible light directly emitted from plasma and a method of using fluorescent light emitted from ultraviolet light emitted from plasma and using this visible light. Usually, the latter method is used.

  In this plasma display device, what is strongly desired is to realize a bright (high luminance) and high contrast display with low power (low driving power). What is important at this time is that the technology required to realize these requirements varies depending on the display rate. The display rate is a ratio of a region that actually emits light (performs display discharge) in the display region Rp. The display rate varies depending on the image to be displayed. A display with a display rate of approximately 100% (for example, 90% or more) is referred to as an all white display, and a display with a small display rate (for example, 10% or less) is referred to as a small display rate display.

  The inventor of the present application has studied a technique for realizing display with low drive power, high luminance, and high contrast in all white display, and has found the following problems. That is, in order to realize a display with low driving power, high luminance, and high contrast in all white display, it is necessary to increase the basic luminous efficiency hf (details will be described later). For this purpose, it is effective to reduce the panel reflectance β. In order to reduce the panel reflectivity β, the display discharge region area ratio Ad is reduced, and the surface of the increased non-display discharge region in the visual field space is blackened. However, in this case, the area of the display electrode (display discharge electrode) is reduced, and as a result, the display electrode capacity (also referred to as discharge capacity) is reduced, and the single brightness is lowered. Single-shot luminance is the luminance under a driving condition (that is, Fdr = 60 Hz) in which a pair of sustain discharges are generated in one field (16.7 ms). As a result, the luminance in the small display rate display is lowered. That is, it is difficult to achieve both the white display performance and the small display rate display performance. In order to increase the luminance in the small display rate display, it is conceivable to increase the driving frequency. For this purpose, it is essential to reduce the reactive power included in the driving power.

  The present invention has been made in view of the above problems, and its object is to improve the trade-off relationship existing between the all-white display performance and the small display rate display performance, and to provide a plasma display device with excellent overall performance. It is to provide a technology that can be realized.

  Specifically, the inventor found out, “In order to achieve both the all-white display performance and the small display rate display performance, it is possible to simultaneously achieve a reduction in panel reflectivity β, a reduction in single brightness reduction, and a reduction in reactive power. Based on the “essential” issue, the object is to provide a technology that realizes it.

  The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

  (1) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. An area projected onto the display surface of the display space is defined as a display area Rp, and white light is incident on the display area from the visual field space. When the average value in the display area of the ratio of the energy of the light emitted from the display area to the energy of the incident white light in the display area is defined as 0.02 ≦ β ≦ 0. 2 and assuming that the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif, Dsif is 18 μm or less. is there.

  (2) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. A region projected onto the display surface of the display space is a display region Rp, an area of the display region Rp is Sp, and the discharge space The display discharge space is a space where the display discharge is generated, a region projected onto the display surface of the display discharge space is a display discharge region, a set of the display discharge regions in the display region Rp is Rd, When the area of the display discharge region set Rd is Sd and Ad = Sd / Sp is the display discharge region area ratio, 0.05 ≦ Ad ≦ 0.4, and the position of the dielectric film overlapping the X electrode And the average value of the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif, Dsif is 18 μm or less.

  (3) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. A region projected onto the display surface of the display space is a display region Rp, an area of the display region Rp is Sp, The ratio of the energy of light emitted from the display surface to the energy of the incident white light when at least a part of the discharge cells of the electric cell causes white light to enter the display surface from the visual field space. Has a black area of 0.2 or less, the set of black areas in the display area Rp is Rb, the area of the set of black areas Rb on the display surface is Sb, and Ab = Sb / Sp is black The area ratio is 0.95 ≧ Ab ≧ 0.5, and the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric. When the thickness is Dsif, Dsif is 18 μm or less.

  (4) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. An area projected onto the display surface of the display space is a display area Rp, an area of the display area Rp is Sp, When white light is incident on the display surface from the display surface, the ratio of the energy of the light emitted from the display surface to the energy of the incident white light is defined as a reflectance, and the maximum reflectance of the plurality of discharge cells When the value is βmax, at least some of the discharge cells have a black region having the reflectance of 0.5 × βmax or less, and a set of the black regions in the display region Rp is represented by Rb. If the area of the set of regions Rb on the display surface is Sb and Ab = Sb / Sp is the black region area ratio, 0.95 ≧ Ab ≧ 0.5, and the position of the dielectric film overlapping the X electrode And the average value of the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif, Dsif is 18 μm or less.

  (5) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. An area projected onto the display surface of the display space is defined as a display area Rp, and white light is incident on the display area from the visual field space. When the average value in the display area of the ratio of the energy of the light emitted from the display area to the energy of the incident white light in the display area is defined as 0.02 ≦ β ≦ 0. The average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is defined as a dielectric thickness Dsif, and the X electrode of the dielectric film The average value of the relative dielectric constant at the overlapping position and the relative dielectric constant at the position overlapping the Y electrode is defined as the dielectric relative dielectric constant k, and Dsif_e is 2.2 μm or less, where Dsif_e = Dsif / k is the effective dielectric thickness. It is what.

  (6) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. A region projected onto the display surface of the display space is a display region Rp, an area of the display region Rp is Sp, and the discharge space The display discharge space is a space where the display discharge is generated, a region projected onto the display surface of the display discharge space is a display discharge region, a set of the display discharge regions in the display region Rp is Rd, When the area of the display discharge region set Rd is Sd and Ad = Sd / Sp is the display discharge region area ratio, 0.05 ≦ Ad ≦ 0.4, and the position of the dielectric film overlapping the X electrode The dielectric thickness Dsif is an average value of the thickness at the position overlapping with the Y electrode, and the relative dielectric constant at the position overlapping with the X electrode of the dielectric film and the position overlapping with the Y electrode. When the average value of the relative dielectric constant is the dielectric relative dielectric constant k and Dsif_e = Dsif / k is the effective dielectric thickness, Dsif_e is 2.2 μm or less.

  (7) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. A region projected onto the display surface of the display space is a display region Rp, an area of the display region Rp is Sp, The ratio of the energy of light emitted from the display surface to the energy of the incident white light when at least a part of the discharge cells of the electric cell causes white light to enter the display surface from the visual field space. Has a black area of 0.2 or less, the set of black areas in the display area Rp is Rb, the area of the set of black areas Rb on the display surface is Sb, and Ab = Sb / Sp is black The area ratio is 0.95 ≧ Ab ≧ 0.5, and the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric. The thickness is Dsif, the relative dielectric constant at the position where the dielectric film overlaps the X electrode, and the average value of the relative dielectric constant at the position where the dielectric film overlaps the Y electrode is the dielectric relative dielectric constant k, and Dsif_e = Dsif / k The effective dielectric thickness If you, in which Dsif_e is equal to or less than 2.2μm.

  (8) X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and ultraviolet rays generated by the discharge of the discharge gas A plasma display device, comprising: a plasma display panel comprising a plurality of discharge cells comprising at least a phosphor that emits visible light upon excitation by a light source; and a drive circuit for driving the plasma display panel, wherein the plasma display panel The display surface is a surface on which the visible light is radiated, a space on which the visible light is radiated from the display surface is a viewing space, and a space continuously including the plurality of discharge cells is a display space. An area projected onto the display surface of the display space is a display area Rp, an area of the display area Rp is Sp, When white light is incident on the display surface from the display surface, the ratio of the energy of the light emitted from the display surface to the energy of the incident white light is defined as a reflectance, and the maximum reflectance of the plurality of discharge cells When the value is βmax, at least some of the discharge cells have a black region having the reflectance of 0.5 × βmax or less, and a set of the black regions in the display region Rp is represented by Rb. If the area of the set of regions Rb on the display surface is Sb and Ab = Sb / Sp is the black region area ratio, 0.95 ≧ Ab ≧ 0.5, and the position of the dielectric film overlapping the X electrode The dielectric thickness Dsif is an average value of the thickness at the position overlapping with the Y electrode, and the relative dielectric constant at the position overlapping with the X electrode of the dielectric film and the position overlapping with the Y electrode. The relative dielectric constant of Value as a dielectric permittivity k, when the Dsif_e = Dsif / k and the effective dielectric thickness, in which Dsif_e is less 2.2 .mu.m.

  (9) In the plasma display device according to any one of (1) to (8), the barrier ribs extending in two intersecting directions and formed in a lattice shape form part of the plurality of discharge cells. The barrier ribs formed in at least some of the plurality of discharge cells and extending in at least one of the two directions have an average width of 0.1 mm or more. It is.

  (10) In the plasma display device according to (9), the coordinate axis z is taken in the height direction of the partition wall, the position coordinate of the coordinate axis z of the X electrode is zX, and the position of the coordinate axis z of the Y electrode When the coordinate is zY, the absolute value | zY−zX | of the difference between the position coordinates zX and zY is 0.05 mm or more.

  (11) In the plasma display device according to (10), in each of the plurality of discharge cells, a solid wall that surrounds the display discharge space is set as an inner surface of the display discharge space, and the display for display among the inner surfaces of the display discharge space A surface from which visible light is emitted toward the viewing space is defined as an aperture surface, and a solid wall other than the aperture surface among the inner surface of the display discharge space is defined as a non-aperture surface. The aperture surface reflectance is set so that the non-aperture surface reflectance is 80% or more in at least some of the plurality of discharge cells.

  (12) In the plasma display device according to any one of (1) to (8), the plasma display device extends along a first direction and is arranged in a second direction orthogonal to the first direction. A plurality of barrier ribs form a part of the plurality of discharge cells, and an average value of the widths of the plurality of barrier ribs is at least 0.1 mm in at least some of the discharge cells of the plurality of discharge cells. Is.

  (13) An image display system using the plasma display device according to any one of (1) to (12).

  Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.

  That is, it is possible to realize a plasma display device that achieves both full white display performance and small display rate display performance and high brightness and high contrast (a large set BC product Fbcs) at an arbitrary display rate.

It is a principal part expansion disassembled perspective view which shows a part of plasma display panel which is one Embodiment of this invention. It is a principal part expanded sectional view of PDP seen from the direction of arrow D1 in FIG. It is a principal part expanded sectional view of PDP seen from the direction of the arrow D2 in FIG. It is explanatory drawing which shows the structural example of the plasma display apparatus using the plasma display panel shown in FIG. 1, and the image display system which connected the video source to this. 2 is a time chart showing an operation during a 1 TV field period required to display one image on the plasma display panel shown in FIG. 1. FIG. 6 is an explanatory diagram showing voltage waveforms applied to an A electrode, an X electrode, and a Y electrode during the write discharge period of FIG. 5. FIG. 6 is an explanatory diagram showing display discharge pulses applied simultaneously between an X electrode and a Y electrode that are display electrodes (also referred to as display discharge electrodes) during the display period of FIG. 5. It is explanatory drawing which shows typically the detailed structural example of the drive means shown in FIG. It is explanatory drawing which shows typically the advancing direction of the light when a filter is installed in the plasma display panel. It is a principal part enlarged plan view which shows the plane from the visual field space side about the plasma display panel which is other embodiment of this invention. It is a principal part expanded sectional view seen from the direction of D1 shown in FIG. It is a principal part expanded sectional view seen from the direction of D2 shown in FIG. It is a principal part expanded sectional view which shows the comparative example of the plasma display panel shown in FIG.

  In the following embodiments, components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof is omitted in principle. Further, in all the drawings for explaining the present embodiment, hatching or a pattern may be given even in a plan view or a perspective view for easy understanding of the configuration of each member. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
<Description of basic structure and operation>
First, a basic structure of an AC surface discharge type PDP will be described as an example of the PDP studied by the present inventors. In this embodiment, the “front plate” and the “back plate”, which are a pair of substrates constituting the PDP, are the sides on which the light emission by the phosphor passes and becomes the display surface when both are assembled into a panel. The description will be made with the (viewing space side) as the front plate and the side located on the opposite side of the display surface as the back plate. The “front plate” and “back plate” will be described as a substrate structure in which a front substrate and a back substrate each made of a glass substrate are used as base materials, and each member described later is formed on the base material.

  FIG. 1 is an enlarged exploded perspective view of a main part showing a part of the structure of the PDP according to the present embodiment. The PDP 1 according to the present embodiment includes a front plate 2 and a back plate 3 that are arranged to face each other via a discharge space.

  The front plate 2 has a front glass substrate 21 (a substrate on the viewing space side described later) serving as a base material. On the lower surface (inner surface) of the front glass substrate 21, X electrodes 22-1 to 22-2 which are common electrodes transparent to visible light and Y electrodes (scanning electrodes) 23- which are transparent independent electrodes are provided. 1 to 23-2 are attached. Further, X bus electrodes 24-1 to 24-2 and Y bus electrodes 25-1 to 25-2 are stacked on the X electrodes 22-1 to 22-2 and the Y electrodes 23-1 to 23-2, respectively. ing. Further, the X electrodes 22-1 to 22-2, Y electrodes 23-1 to 23-2, X bus electrodes 24-1 to 24-2, and Y bus electrodes 25-1 to 25-2 are covered with a dielectric 26. For example, a protective film (also referred to as a protective layer) 27 such as magnesium oxide (MgO) is provided to cover the dielectric 26. The X electrodes 22-1 to 22-2 and the X bus electrodes 24-1 to 24-2 may be collectively referred to as an X electrode. The Y electrodes 23-1 to 23-2 and the Y bus electrodes 25-1 to 25-2 may be collectively referred to as Y electrodes. In addition, the X electrodes 22-1 to 22-2, the Y electrodes 23-1 to 23-2, the X bus electrodes 24-1 to 24-2, and the Y bus electrodes 25-1 to 25-2 are collectively displayed discharge electrodes or The display electrode (when including the concept of a pair of X and Y, the display discharge electrode pair or the display electrode pair) is collectively referred to. The substrate structure integrally processed in this way is referred to as a front plate 2.

  In the present embodiment, the X electrodes 22-1 to 22-2 and the Y electrodes 23-1 to 23-2 are transparent to visible light. This is because, by using a transparent conductive material, more light generated in the discharge space 33 can be extracted to the viewing space side, and a bright (high brightness) panel can be obtained. However, it goes without saying that the X electrodes 22-1 to 22-2 and the Y electrodes 23-1 to 23-2 are not limited to transparent electrode materials.

  In this embodiment, magnesium oxide (MgO) is used as the material of the protective film 27, but the material of the protective film 27 is not limited to this. The protective film 27 protects the display discharge electrode and the dielectric 26 from incident ions, supports secondary discharge generation by secondary electron emission accompanying ion incidence, and high-speed discharge generation by generation of priming electrons. It can be replaced with other materials if the purpose can be achieved.

  On the other hand, the back plate 3 has a back glass substrate 28 serving as a base material. On the upper surface (inner surface) of the rear glass substrate 28, there are provided A electrodes (address electrodes) 29 that are three-dimensionally intersecting with the X electrodes 22-1 to 22-2 and the Y electrodes 23-1 to 23-2. In addition, the A electrode 29 is covered with a dielectric 30, and a partition wall 31 is provided on the dielectric 30 in parallel with the A electrode 29. In the present embodiment, the partition wall 31 is composed of a component parallel to the A electrode 29 (straight partition wall), but various modifications can be applied to the arrangement of the partition wall 31. For example, the partition wall 31 may be configured to include a component perpendicular to the A electrode 29 (box partition wall). A phosphor 32 is applied to the inside of the recessed area formed by the wall surface of the partition wall 31 and the upper surface of the dielectric 30. What is integrally processed in this way is referred to as a back plate 3.

  The front plate 2 and the back plate 3 in which necessary components are formed as described above are joined, filled with a gas (discharge gas) for generating plasma, and sealed to form the PDP 1. Needless to say, the airtightness of the discharge gas must be maintained in the joining and sealing of the front plate 2 and the back plate 3.

  FIG. 2 is an enlarged cross-sectional view of the main part of the PDP viewed from the direction of the arrow D1 in FIG. 1, and schematically shows one cell that is the minimum unit of pixels. FIG. 13 is a cross-sectional view of a PDP which is a comparative example with respect to the present embodiment, and shows a portion corresponding to the cross section shown in FIG. The cell boundary is a position indicated by a broken line. Hereinafter, the cell is also referred to as a discharge cell. In FIG. 2, the A electrode 29 is located between two partition walls 31, a gas (discharge gas) for generating the plasma in the discharge space 33 surrounded by the front glass substrate 21, the rear glass substrate 28, and the partition walls 31. Is filled.

  The discharge space 33 is a space in which any one of display discharge, address discharge, and preliminary discharge (also referred to as reset discharge) described later is generated in driving the PDP 1. More specifically, it is a space that is filled with the discharge gas, is applied with an electric field necessary for the discharge, and has a spatial extent necessary for generating the discharge. Furthermore, a space in which display discharge occurs (specifically, a space that is filled with the discharge gas, an electric field necessary for display discharge is applied, and has a spatial extent necessary for display discharge generation) is referred to as a display discharge space. . The discharge space and the display discharge space may mean a space included in each discharge cell or a set of these spaces.

  In the color PDP, there are usually three types of phosphors for red, green, and blue that are applied in a cell. Three cells coated with these three kinds of separate phosphors are collectively set as one pixel. A space in which a plurality of such cells or pixels are gathered continuously and periodically is called a display space. A device including such a display space and having other necessary functions such as a vacuum sealing function and an electrode extracting function is called a plasma display panel (PDP) or a plasma panel.

  In the PDP, the integral part that maintains the airtightness of the discharge gas and is inseparable is called a basic PDP (basic plasma panel). In the basic PDP, a surface from which visible light for display is emitted is a display surface, and a space from which the visible light for display is emitted is a viewing space. As described above, there is a space continuously including at least a plurality of the discharge cells in the basic PDP, and this is used as a display space. A projection area of the display space onto the display surface is a display area Rp. A projection area of the discharge space onto the display surface is a discharge area. Further, a projection area of the display discharge space onto the display surface is set as a display discharge area. Further, a region other than the display discharge region in the display region Rp is set as a non-display discharge region. A projection area of the discharge cell onto the display surface is a cell area. Further, a direction perpendicular to the display surface is a height direction.

  When the discharge cell has a barrier rib as a part of its constituent elements, the direction connecting the centers of two adjacent cells through the barrier rib is the width direction, and the direction parallel to the display surface is perpendicular to the width direction. The longitudinal direction.

  The width of the partition wall in the width direction is defined as a partition wall width, and the average value of the partition wall width in the height direction is defined as an average partition wall width Wrba.

  In the structural example shown in FIG. 1, the partition wall 31 in the PDP 1 is arranged so that the longitudinal direction extends substantially along one direction. Such an arrangement structure of the partition walls 31 is called a straight partition structure. In another structural example, the longitudinal direction of the partition in the PDP is arranged in at least two directions, that is, DR1 and DR2. Such a partition arrangement structure is called a box partition structure.

  FIG. 3 is an enlarged cross-sectional view of the main part of the PDP as viewed from the direction of the arrow D2 in FIG. 1, and shows one cell. The cell boundary is a position indicated by an alternate long and short dash line. The width of the gap between the display electrode pair (X electrode and Y electrode) shown in FIG. 3 is referred to as a display electrode gap Wgxy. In FIG. 3, the electron 13, the positive ion 14, the positive wall charge 15, and the negative wall charge 16 are schematically shown for explanation.

  FIG. 3 shows, as an example, a schematic diagram in which a discharge is generated and terminated by applying a negative voltage to the Y electrode 23-1 and a (relatively) positive voltage to the A electrode 29 and the X electrode 22-1. Represents. As a result, formation of wall charges that assists in starting discharge between the Y electrode 23-1 and the X electrode 22-1 (this is referred to as writing) is performed. In this state, when an appropriate reverse voltage is applied between the Y electrode 23-1 and the X electrode 22-1, a discharge occurs in the discharge space between both electrodes via the dielectric 26 (and the protective film 27). When the applied voltages of the Y electrode 23-1 and the X electrode 22-1 are reversed after the discharge is completed, a new discharge is generated. By repeating this, a discharge can be continuously formed. This is called display discharge (or sustain discharge).

  FIG. 4 is an explanatory view showing a configuration example of a plasma display device using the PDP shown in FIG. 1 and an image display system (plasma display device) in which a video source is connected thereto. The plasma display apparatus 100 includes a PDP 1 and a driving unit 101 that drives the PDP 1. Further, FIG. 4 shows a configuration example having a video source 102 that sends a display screen signal to the driving means 101. The driving means (also referred to as a driving circuit) 101 receives a display screen signal from the video source 102 and converts it into a driving signal for the PDP 1 according to the procedure described below to drive the PDP 1.

  FIG. 5 to FIG. 7 are explanatory diagrams showing the operation during a period of 1 TV field (hereinafter also referred to as field) required to display one image on the PDP shown in FIG. FIG. 5 is a time chart. As shown in (I), the 1TV field 40 is divided into subfields 41 to 48 having a plurality of different light emission times. The gradation is expressed by selecting light emission and non-light emission for each subfield. Each subfield 41, 42, 43, 44, 45, 46, 47, 48 includes a preliminary discharge period 49, an address discharge period 50 that defines a light emitting cell, and a display period (also referred to as a light emitting display period) as shown in (II). 51.

  The preliminary discharge period 49 is a period for performing an operation aimed at making the state of each cell (a state defining the drive characteristics) uniform and performing the subsequent drive stably and reliably. Usually, in the preliminary discharge period 49, preliminary discharge, reset discharge, or full writing discharge (discharge for simultaneously writing the entire display area) is performed.

  FIG. 6 shows voltage waveforms applied to the A electrode, the X electrode, and the Y electrode in the write discharge period of FIG. A waveform 52 is a voltage waveform applied to one A electrode in the write discharge period 50, a waveform 53 is a voltage waveform applied to the X electrode, and waveforms 54 and 55 are applied to the i-th and (i + 1) th of the Y electrode. The example of a voltage waveform is shown, and let each voltage be V0, V1, V2 (V). From FIG. 6, when the scan pulse 56 (in FIG. 6, the voltage at the time of the scan pulse is the ground voltage (GND) but may be a negative voltage) is applied to the i-th row of the Y electrode, the A electrode 29 A write discharge occurs in a cell located at the intersection with. Further, when the scan pulse 56 is applied to the i-th row of the Y electrode, if the A electrode 29 is at the ground potential (reference potential), no write discharge occurs. In this manner, in the write discharge period 50, a scan pulse is applied once to the Y electrode, and the A electrode 29 becomes V0 in the light emitting cell and the ground potential in the non-light emitting cell corresponding to the scan pulse. In the discharge cell in which the writing discharge has occurred, the electric charge generated by the discharge is formed on the surface of the dielectric and the protective film covering the Y electrode. On / off of the display discharge described later can be controlled with the help of the electric field generated by the electric charge. That is, the discharge cell that has caused the write discharge becomes a light emitting cell, and the others become non-light emitting cells. There is also a driving method in which the discharge cell that has caused the write discharge becomes a non-light emitting cell (the wall charge formed by the full write discharge is erased by the write discharge), and the others become light emitting cells.

FIG. 7 shows display discharge pulses applied simultaneously between the X electrode and the Y electrode which are display electrodes (also called display discharge electrodes) during the display period 51 of FIG. A voltage waveform 58 is applied to the X electrode, and a voltage waveform 59 is applied to the Y electrode. In both cases, the pulses of the voltage V3 (V) having the same polarity are alternately applied, whereby the relative voltage between the X electrode and the Y electrode is repeatedly inverted. The discharge that occurs in the discharge gas between the X electrode and the Y electrode during this time is called display discharge. Here, the display discharge is alternately performed in a pulse manner. When the voltages applied to the X electrode and Y electrode in the display period are Vx (t) and Vy (t), respectively, and the voltage applied from the outside to the cell in the display period is the display interelectrode voltage Vse (t), the display The interelectrode voltage Vse (t) is
Vse (t) = Vy (t) −Vx (t) (1)
It is. In the above, t represents time. The maximum value of the absolute value | Vse (t) | of the display electrode voltage Vse (t) when the display discharge pulse is applied is referred to as a display discharge maximum applied voltage and is represented by Vsemax. In FIG. 7, Vsemax is V3 (V). However, if the voltage actually applied to the display electrode is not a rectangular wave as shown in FIG. 7 and fluctuates due to the circuit capacity, inductance, resistance, etc., V3 is an average display when the display discharge pulse is applied. This represents the electrode voltage, and Vsemax is slightly different from V3.

  The means for forming the display discharge pulse is installed, for example, in the driving means 101 shown in FIG. An overview of this is shown in FIG. The means for forming the display discharge pulse includes means for supplying a DC voltage, that is, a display discharge DC power supply, and a switch circuit installed between the display discharge DC power supply and the display electrode (switch circuit X and switch circuit in FIG. 8). Y) is configured as part of the component. The display discharge DC power supply may be a simple capacitor or may be a simple ground electrode (ground wiring). The switch circuit functions to select and apply the output voltage of the display discharge DC power source including the ground potential to the display electrodes. The maximum value of the absolute value of the output voltage difference between the display discharge DC power supplies in the display period is defined as a DC power supply display discharge voltage Vsdc. The DC power supply display discharge voltage Vsdc is approximately equal to the above V3. However, if the voltage actually applied to the display electrode is not a rectangular wave as shown in FIG. 7 and fluctuates due to the capacity, inductance, resistance, etc. of the circuit, Vsdc is slightly different from V3.

  In the above, the display discharge has been described by the driving method (writing display separation driving method) in which the writing discharge period and the display period are separated, but the essence of the display discharge is a discharge for intentionally realizing light emission necessary for display. Needless to say, such a discharge is recognized as a display discharge even in other driving. For example, in the drive method described above (write display separated drive method), the write discharge period and the light emission display period are set simultaneously in the entire display region, but the write discharge period and the light emission display period are set for each scan electrode (Y electrode). Independent drive systems (write display simultaneous drive system) are also possible.

  In this embodiment, a so-called progressive drive system is used, and image display is performed using all discharge cells in the display area for each field. On the other hand, a so-called interlace drive method is also possible. In the interlaced driving method, PDP discharge cells are classified into two types (for example, A group and B group), and image display is performed using either A group or B group discharge cells for each field. For example, the fields are classified alternately into an odd field and an even field in time order, and image display is performed using an A group discharge cell in the odd field and a B group discharge cell in the even field. Further, it is possible to use a common scanning electrode (Y electrode) in the driving of the odd field and the even field. A plasma display device using the interlace driving method and the PDP to which this driving method is applied is called an ALIS (Alternating Lighting of Surfaces) method plasma display device, and details thereof are described in “Y. Kanazawa, T. Ueda, S. Kuroki, K. Kariya and T. Hirose: “High-Resolution Interlaced Addressing for Plasma Displays”, 1999 SID International Symposium Digest of Technical Papers, Volume XXX, 14.1, pp. 154-157 (1999) ” Yes.

  Next, description will be made on the details of the study that led the inventors to find the following new problem and the means for solving the new problem.

<About contrast>
First, a discussion on contrast C will be given. Contrast C is
C = Bpon / Boff (2)
Is defined. Bpon is the luminance when performing light emission display (or maximum luminance display), and Boff is the luminance when displaying black, both of which are expressed in units of cd / m ² . Luminance is usually measured using a luminance meter. The contrast C is further measured separately as the bright room contrast Cb and the dark room contrast Cd, and corresponds to the bright environment (usually assuming the brightness of the living room, that is, the illuminance of 150 to 200 lx (look)) and the contrast in the dark room, respectively. . The larger the contrast value obtained by equation (2), the clearer and more beautiful the image can be expressed. That is, a larger contrast is required in the plasma display device.

In the plasma display device, the luminance Boff at the time of black display in a dark room is not necessarily zero. This is because light emission that is not necessarily required for image display occurs due to preliminary discharge (also called reset discharge or full-write discharge) in the preliminary discharge period and address discharge in the address discharge period. Therefore, in the plasma display device, the darkroom contrast is not infinite but has a finite value. This value is
Cd = Bpond / Boffd (3)
It is. However, Bpond and Boffd are “luminance [cd / m ² ] when light emission display (or maximum luminance display) in a dark room” and “luminance [cd / m ² ] when black display is in a dark room”, respectively. It is. In order to increase the dark room contrast Cd, Bpond is increased or Boffd is decreased, which is determined by the cell structure and discharge characteristics.

  On the other hand, in order to increase the bright room contrast Cb, a filter whose light transmission characteristics are controlled is usually used. FIG. 9 shows a schematic configuration thereof. FIG. 9 is an explanatory diagram schematically showing the traveling direction of light when a filter is installed in the PDP. Hereinafter, the principle of increasing the bright room contrast Cb by the filter will be described.

In the configuration of FIG. 9, a portion surrounded by PDP 1 is a portion corresponding to the basic PDP. The basic PDP is sometimes called a module (PDP module). In the configuration of FIG. 9, the bright room contrast Cb when viewing the display image from the viewpoint direction is roughly
Cb = (Bponm ^* α + Br ^* α2 ^* β) / (Boffm ^* α + Br ^* α2 ^* β) (4)
It becomes. However,
Bponm: Luminance when light emission is displayed in a dark room without a filter (that is, only with a basic PDP), that is, module luminance [cd / m ² ],
Boffm: luminance [cd / m ² ] when displaying black in a dark room without a filter (that is, only with a basic PDP),
Br: Luminance of the room light, luminance of the outside light in the bright room formed by a completely reflecting surface (diffuse reflecting surface having a surface reflectance of 100%) virtually installed on the front surface of the filter (side surface of the filter) [cd / m ² ] ,
α: Filter transmittance,
β: The average value of the surface reflectance on the display surface in the display area of the PDP, that is, the display area surface reflectance, the module reflectance, or the panel reflectance.
The symbol ^* represents multiplication. When the illuminance in the bright room environment is Llx, Br = L / π≈L / 3.14 cd / m ² .

The surface reflectance is “a ratio of reflected light energy to incident light energy in a situation where a part of light incident on a certain surface (incident surface) is emitted as reflected light”. The transmittance is “a ratio of transmitted light energy to incident light energy in a situation where a part of light incident on the surface (incident surface) of a certain object is transmitted through the object and emitted as transmitted light”. .
In principle, it is possible to define and measure the surface reflectance and transmittance by specifying a location with an accuracy of about the wavelength of incident light at an arbitrary location on the incident surface. Usually, both surface reflectance and transmittance are measured as a function of the location of the incident surface using a surface reflectance meter and a transmittance meter. In general, both the surface reflectance and transmittance are functions of the wavelength of incident light. Therefore, the surface reflectance β and transmittance α in the equation (4) are average values determined in consideration of the wavelength distribution spectrum of room light and human visibility in the visible light wavelength range. More simply, it is the average value of the surface reflectance and transmittance in a wavelength range in which human visibility is large, that is, in a wavelength range of 500 nm to 600 nm. Further, in the formula (4), it is assumed that there is no reflection of visible light on the filter surface.

Cb with Br = 0 in the equation (4) gives dark room contrast Cd,
Cd = Bponm / Boffm (5)
It becomes.

In the normal bright room condition (L = 150 to 200 lx) in the equation (4),
Bponm ^* α >> Br ^* α2 ^* β,
Boffm ^* α << Br ^* α2 ^* β. Therefore, the equation (4) is expressed as Cb≈Bponm / (Br ^* α ^* β) (6)
It becomes. That is, when Bponm, Br, and β are constant, if the filter transmittance α is decreased, the bright room contrast Cb increases in inverse proportion to α. This is the principle of increasing the bright room contrast by the filter.

Next, the luminous efficiency will be discussed. As the luminous efficiency h, the luminous efficiency hm when the filter is not used (that is, when only PDP 1 in FIG. 9) and the luminous efficiency hs when the filter is used (that is, when the filter is installed in PDP 1 in FIG. 9) are defined. It is possible,
hm = π ^* Bponm ^* Sp / Pdp (7)
hs = π ^* Bponm ^* α ^* Sp / Pdp (8a)
= Α ^* hm (8b)
It is. However,
hm: Luminous efficiency when no filter is used, called module luminous efficiency [lm / W],
hs: luminous efficiency when using a filter, called set luminous efficiency [lm / W],
π: Pi,
Sp: area [m ² ] of the light emitting display region,
Pdp: Discharge power, input power to discharge space of plasma panel [W]
It is. However, it was assumed that the luminescence was completely diffuse luminescence. Expressions (7), (8a), and (8b) are established at the time of arbitrary gradation display.

The set brightness Bpons is
Bpons = Bponm ^* α (9)
Bpons: Luminance when light emission is displayed in a dark room with a filter (that is, in a set state), that is, set luminance [cd / m ² ]
It becomes.

Of course, what is finally important is the performance of the set, and the BC product of the set Fbcs≡Bpons ^* Cb (10)
Fbcs: BC product of the set [cd / m ² ]
It is. The symbol ≡ is an equal sign and is substantially equivalent to the symbol =. The symbol ≡ was used to indicate the meaning of the definition. Increasing the BC product Fbcs of the set realizes a PDP with high brightness and high contrast.

From formulas (6), (9) and (10),
Fbcs = Bponm ² / (Br ^* β) (11)
And using equations (11) and (7),
Fbcs ^0.5 = (Pdp / (Br ^{0.5 *} π ^* Sp)) ^* (hm / β ^0.5 ) (12)
It becomes.

That is,
Fbcs ^0.5 = A ^* hfn (13)
A≡Pdp / (Br ^{0.5 *} π ^* Sp) (14)
hfn≡hm / β ^0.5 (15)
A: Coefficient determined by driving and environment [W ^* cd ^0.5 / (lm ^* m)],
hfn: Basic luminous efficiency [lm / W]
It becomes. From the equations (13) to (15), it can be seen that “in order to increase the BC product Fbcs of the set under the constant discharge power Pdp (A constant), it is essential to increase the basic luminous efficiency hfn”. This has been clarified for the first time by the inventors' consideration.

The reason why hfn defined by the equation (15) is referred to as “basic” luminous efficiency will be described. The equation (15) is defined by the module luminous efficiency hm, which is a physical quantity of the module (no filter), and the panel (no filter, module) reflectivity β. A physical quantity similar to this is formally expressed as hfns≡hs / βs ^0.5 (16)
hfuns: Basic luminous efficiency of set [lm / W],
βs: defined as set reflectance.

Referring to FIG. 9, βs = β ^* α ² (17)
Therefore, from equations (8b), (16), and (17),
hfns = hm * α / (β ^{0.5 *} α) (18a)
= Hm / β ^0.5 (18b)
= Hfn (18c)
It becomes.

  That is, hfns defined by equation (16) is constant regardless of the filter transmittance α, and its value is equal to hfn defined by equation (15). In this sense, hfn defined by equation (15) is referred to as basic luminous efficiency.

<About power>
Next, power will be discussed. The power Pp consumed by the PDP including the drive circuit is divided into a discharge power Pdp and a reactive power Pcp. Pp = Pdp + Pcp (19)
Pdp: Discharge power, discharge input power to plasma panel [W]
Pcp: reactive power, power consumed mainly by the drive circuit unit [W]
It becomes.

The discharge power Pdp will be discussed. The discharge input power Pdp to the plasma panel is
Pdp = Ncb ^* Pdc (20)
^{Pdc = 2 * Fdr * Cdc *} Vs 2 (21)
However,
Pdc: discharge power of 1 discharge cell, discharge input power [W] to 1 discharge cell,
Ncb: the number of cells (on cells) that perform display discharge in the plasma panel (in the display space),
Fdr: Drive frequency [Hz],
Cdc: discharge capacity of 1 discharge cell, capacity [F] in which the display electrode in 1 discharge cell accumulates discharge charge,
Vs: Display discharge voltage [V]
It is. The drive frequency Fdr is the number of times that a periodic voltage is applied to the display electrode in a unit time (1 second). The discharge capacity Cdc is a capacity that the display electrode (X electrode or Y electrode) forms with the virtual electrode on the surface of the protective film 27 via the dielectric 26 and the protective film 27 in one discharge cell. The discharge capacity Cdc of one cell is further
Cdc = ε ^* Sse / Dsif (22)
However,
ε: average dielectric constant [CV ⁻¹ m ⁻¹ ] of the layer including the dielectric 26 and the protective film 27,
Sse: Display electrode area (X electrode or Y electrode) in the discharge cell, display electrode area [m ² ],
Dsif: the thickness of the dielectric material, the total thickness of the dielectric material 26 and the protective film 27 [m]
It is.

  FIG. 3 shows the definition of the dielectric thickness Dsif. The dielectric thickness Dsif is a layer in which the dielectric 26 and the protective film 27 formed on the surface of the front glass substrate 21 are combined, and the display electrode (X electrode, X bus electrode, Y electrode, or Y bus electrode) and ( It is the average value of the thickness at the overlapping position (in the thickness direction).

From equations (20), (21), and (22), the discharge input power Pdp to the plasma panel is
Pdp = 2 ^* Ncb ^* ε ^* Fdr ^* (Sse / Dsif) ^* Vs ² (23)
It is.

  That is, if other conditions are constant, the display electrode area Sse and the dielectric thickness Dsif are in a proportional relationship in order to realize the same discharge input power Pdp. That is, even if the display electrode area Sse decreases, the same discharge input power Pdp can be input to the plasma panel if the dielectric thickness Dsif is decreased in proportion thereto.

The reactive power Pcp will be discussed. The reactive power Pcp is
Pcp = 2 ^* (1-βcp) ^* Cwp ^* Vs ^{2 *} Fdr (24)
βcp: power recovery efficiency,
Cwp: Panel wiring capacity [F]
It is. The panel wiring capacity is
Cwp = Ncp ^* Cwc (25)
Ncp: total number of cells in the plasma panel (in the display space),
Cwc: cell wiring capacity, wiring capacity formed by the display electrode pair in one discharge cell [F]
It is. The cell wiring capacity Cwc is a wiring capacity formed by the display electrode pair (X electrode and Y electrode) in one discharge cell. Generally, when the dielectric thickness Dsif is reduced, the cell wiring capacitance Cwc is reduced. This is because when the dielectric thickness Dsif is reduced, the lines of electric force between the display electrode pairs are pushed out from the dielectric layer having a large relative dielectric constant k into a vacuum (in the discharge space) having a small relative dielectric constant k.

  Based on the above considerations, we will discuss how to improve the performance of all white display. In all white display, Pdp >> Pcp is usually satisfied. Therefore, the power consumption Pp of the PDP is approximately equal to the discharge power Pdp from equation (19), and Pp≈Pdp. Considering that the driving and environmental conditions of the power consumption Pp (that is, the approximate discharge power Pdp), the room light luminance Br, and the light emitting display area (ie, the display size) Sp are constant, the coefficient A in the equation (14) Is constant, and from equation (13), the square root of the set BC product Fbcs is proportional to the basic luminous efficiency hfn. That is, it can be seen that “A1: display performance (set BC product Fbcs) in all white display increases with the square of the basic luminous efficiency hfn”. Furthermore, from the equation (15), it can be seen that reducing the display area surface reflectance (module reflectance) β is effective in increasing the basic luminous efficiency hfn. That is, it is understood that “A2: An effective method for achieving high performance of display performance (set BC product Fbcs) in all-white display is to reduce display area surface reflectance (module reflectance) β”. .

<About module reflectivity>
Next, a method for reducing the module reflectance, that is, the display area surface reflectance β will be discussed. The display area surface reflectance β is an average value of the surface reflectance in the display area. The largest factor that increases the display area surface reflectance β is the ratio of the area of the display area (that is, the discharge area) of the discharge area to the area of the display area (that is, the display area) of the display area (that is, the discharge area). Area ratio). In particular, the ratio of the display discharge area to the display area (the area of the display discharge area on the display surface) (that is, the display discharge area ratio) is important. This is because display discharge is performed in a discharge space (particularly display discharge space) that defines a discharge region, and a phosphor that converts ultraviolet light generated by the display discharge into visible light is applied over a wide area. In order to effectively use visible light generated in the phosphor, the phosphor layer (layer coated with the phosphor) is generally composed of a white phosphor, and thus the reflectance of the phosphor layer is high. Furthermore, the structure of the discharge space itself is a structure that efficiently emits visible light generated in the phosphor layer to the visual field space. That is, when viewed from the outside, the discharge space itself is white. That is, the reflectivity of the discharge region is high. Therefore, as the discharge area area ratio (particularly the display discharge area area ratio) increases, the display area surface reflectance β increases.

Display discharge area ratio Ad
Ad = Sd / Sp (26)
Sd: display discharge area [m ² ],
Sp: Display area [m ² ]
Then, for example, in the PDP of the comparative example shown in FIG. 13, the display discharge area ratio Ad is 45% or more. In particular, when the ALIS system plasma display device is used, the display discharge area ratio Ad is 65% or more. As a result, the display area surface reflectance (module reflectance) β in the PDP of the comparative example is 25% or more. In particular, in the case of an ALIS plasma display device, the display area surface reflectance β is 32% or more. That is, it is understood that “A3: An effective method for reducing the module reflectance, that is, the display area surface reflectance β is to reduce the display discharge area area ratio Ad”.

  Further, it can be said that “A4: When the display discharge area ratio Ad is reduced, the display electrode area Sse in each discharge cell is inevitably reduced”. This is because Sse <Ad always.

  To summarize the above discussions and conclusions of A1 to A4, “A5: increase in basic luminous efficiency hfn to improve display performance (set BC product Fbcs) in all white display, display area surface reflectance (module reflectance) β It can be seen that reduction of the display area area ratio Ad of the display discharge area inevitably reduces the display electrode area Sse in each discharge cell.

<About small display rate display performance>
Next, the small display rate display performance will be discussed. That is, the display performance with a display rate of approximately 10% or less will be discussed. In the small display rate display, it is usually Pcp >> Pdp. Therefore, the power consumption Pp of the PDP is approximately equal to the reactive power Pcp from the equation (19), and Pp ≦ Pcp. Now, assuming that power consumption Pp (that is, roughly reactive power Pcp), power recovery efficiency βcp, panel wiring capacitance Cwp, and display discharge voltage Vs are constant, the maximum drive frequency Fdr that can be driven from equation (24) is also constant. become. At this time, if the display rate (the number of display discharge cells Ncb), the dielectric permittivity ε, the dielectric thickness Dsif, and the display discharge voltage Vs are considered to be constant from the equation (23), the discharge power Pdp is equal to the display electrode area Sse. Proportional. As a result, from the expressions (7) and (9), the set luminance Bpons is also proportional to the display electrode area Sse. Furthermore, from the equations (6), (9), and (10), the BC product Fbcs of the set is proportional to the square of the display electrode area Sse. That is, it can be seen that “A6: display performance in small display rate display (set BC product Fbcs) is proportional to the square of the display electrode area Sse”.

  To summarize the above discussions and conclusions of A5 and A6, “A7: increase in basic luminous efficiency hfn to improve display performance (set BC product Fbcs) in all white display, display area surface reflectance (module reflectance) β If the reduction in the display discharge area ratio Ad is reduced, the display electrode area Sse in each discharge cell inevitably decreases, and as a result, the display performance (set BC product Fbcs) in the small display ratio display decreases rapidly. I understand. That is, it can be seen that “A8: There is a trade-off problem between the all white display performance and the small display rate display performance”.

  Further, it can be seen that the drive frequency Fdr can be increased if the panel wiring capacitance Cwp can be reduced under the condition of the small display rate display and the constant reactive power Pcp in the equation (24). That is, in order to eliminate the trade-off relationship of “A9: A8 and achieve both the white display performance and the small display ratio display performance, the display area surface reflectance (module reflectance) β is reduced, and the small display ratio display brightness is set. It is understood that it is indispensable to simultaneously suppress the reduction (single brightness reduction) and reduce the panel wiring capacity.

<Means to eliminate trade-off relationship>
In the following, a method for eliminating the A8 trade-off relationship will be specifically described. First, similarly to the discussion made in connection with A6, the power consumption Pp (that is, the approximate reactive power Pcp), the power recovery efficiency βcp, the panel wiring capacity Cwp, and the display discharge voltage Vs are constant under the conditions of the small display rate display. Think about it. Therefore, the maximum drive frequency Fdr that can be driven from the equation (24) is also constant. At this time, if the display rate (number of display discharge cells Ncb), the dielectric permittivity ε, and the display discharge voltage Vs are assumed to be constant and the dielectric thickness Dsif is variable, the discharge power Pdp is calculated from the equation (23). It is proportional to the quotient of the area Sse and the dielectric thickness Dsif, that is, Sse / Dsif. Therefore, even if the display electrode area Sse is decreased in order to increase the all white display performance, if the dielectric thickness Dsif is decreased in proportion to the display electrode area Sse, the decrease in the discharge power Pdp is suppressed. As a result, it is possible to suppress a decrease in the small display rate display performance. That is, it is understood that “A10: By reducing the dielectric thickness Dsif, it is possible to simultaneously realize an increase in all white display performance and an increase in small display rate display performance”.

In general, when the relative dielectric constant k of the dielectric of the front plate is approximately 12, Dsif = 30 μm, and when the relative dielectric constant k of the dielectric of the front plate is approximately 8, Dsif = 20 μm. Based on the above-described reason, such a value of Dsif is empirically used to maintain the brightness and bright room contrast in the small display rate display, that is, the BC product Fbcs of the set in the small display rate display at a predetermined performance. It is a fixed value. That is,
Dsif_e = Dsif / k (27)
k = ε / ε ₀ (28)
Dsif_e: effective dielectric thickness, effective thickness [m] of the combined layer of the dielectric 26 and the protective film 27,
k: average relative dielectric constant of the layer including the dielectric 26 and the protective film 27;
ε ₀ : dielectric constant [CV ⁻¹ m ⁻¹ ] of vacuum, ε ₀ = 8.85 × 10 ⁻¹² CV ⁻¹ m ⁻¹
Assuming that the effective dielectric thickness Dsif_e is defined as follows, in the comparative example shown in FIG. 13, Dsif_e is approximately 2.5 μm. Further, as described above, in the comparative example, the display discharge area area ratio Ad is 45% or more, and the display area surface reflectance (module reflectance) β is 25% or more.

  From the above discussion of A1 to A3, in order to improve the display performance (set BC product Fbcs) in all white display, it is effective to reduce the display discharge area ratio Ad, and Ad is 40% or less, 30%. Below, or 20% or less is effective. From the viewpoint of increasing the all white display performance, it is effective to reduce the value of Ad. However, according to the study of the present inventor, if the value of Ad is set to 40% or less, a general viewer ( A person who views a display to which the present technology is applied) can perceive an improvement in display performance in all white display as an improvement in display performance. In addition, as the Ad value is decreased, the performance improvement effect can be more clearly perceived, but a relative difference can be clearly perceived every time the Ad value is reduced by 10%. Thus, when the Ad value is 40% or less, 30% or less, or 20% or less, the display area surface reflectance (module reflectance) β may be 20% or less, 15% or less, or 10% or less. it can.

  However, as a result, the display electrode area Sse decreases, and as described in A7, the display performance (set BC product Fbcs) in the small display rate display rapidly decreases. However, by reducing the dielectric thickness Dsif according to the discussion of A10, it is possible to simultaneously realize an increase in all white display performance and an increase in small display rate display performance. Specifically, it is effective to set Dsif_e to 2.2 μm or less, 1.7 μm or less, or 1.1 μm or less, corresponding to the order of the Ad values described above. For example, when the relative dielectric constant k of the dielectric 26 of the front plate 2 is 8, Dsif is set to 18 μm or less, 14 μm or less, or 9 μm or less. Further, when the relative dielectric constant k of the dielectric 26 of the front plate 2 is 12, Dsif is set to 26 μm or less, 20 μm or less, or 13 μm or less. According to the study of the present inventor, even when the value of the above-described display discharge area ratio Ad is set to 40% or less, if the value of Dsif_e is set to 2.2 μm or less, the display in the small display rate display is performed. Since a decrease in performance (set BC product Fbcs) can be suppressed, as described above, a general viewer perceives an improvement in display performance in all white display and small display area display as an improvement in display performance. be able to. Further, if the value of Dsif_e is 1.7 μm or less and 1.1 μm or less, even if the display discharge area ratio Ad is 30% or less and 20% or less, the display performance in the small display rate display Since a decrease in (set BC product Fbcs) can be suppressed, it is possible to more clearly sense further improvement in display performance in all white display and small display area display.

  However, as a technique for reducing the value of Dsif_e to the predetermined value or less, when the value of Dsif is extremely reduced (that is, the thickness of the dielectric is reduced), the following new problem may occur. . That is, when Dsif decreases, the electrical withstand voltage performance of the dielectric 26 deteriorates. Further, when Dsif decreases, the discharge capacity Cdc increases, and as a result, the ion density incident on the surface of the protective film increases, and the sputtering on the surface of the protective film increases. As a result, the life of the protective film is reduced. Thus, from the viewpoint of improving the display performance, it is preferable that the value of Dsif_e described above be small (thin) (in the order of 2.2 μm or less, 1.7 μm or less, and 1.1 μm or less). On the other hand, from the viewpoint of improving electrical withstand voltage performance or improving the life of the protective film, the value of Dsif is preferably increased (thickened). Therefore, it is preferable that the specific value of Dsif_e be the smallest value within the above-described numerical range within a range in which the required electric withstand voltage performance or the life of the protective film can be secured.

  Further, when a preferable value of Dsif is evaluated regardless of the value of the dielectric constant k, it is preferable that Dsif is 18 μm or less. By setting Dsif to be 18 μm or less, the relative dielectric constant k of the dielectric 26 and the protective film 27 is drastically reduced, for example, even when the relative dielectric constant k = 8, as described above, An increase in white display performance and an increase in small display rate display performance can be realized simultaneously. Further, by further reducing the value of Dsif to 14 μm or less and 9 μm or less, the all white display performance and the small display rate display performance are further increased. An improvement in performance can be perceived as an improvement in display performance.

  However, as described above, the value of Dsif is preferably increased (thick) from the viewpoint of improving the electrical withstand voltage performance or improving the life of the protective film. Therefore, the specific value of Dsif is the above-described numerical value. Within the range, it is preferable to set the smallest value within the range in which the required electric withstand voltage performance or the life of the protective film can be secured.

  Next, it will be described that the reactive power Pcp decreases when the dielectric thickness Dsif or the effective dielectric thickness Dsif_e is decreased, and as a result, the small display rate display performance is further improved.

  As described above, generally, when the dielectric thickness Dsif or the effective dielectric thickness Dsif_e is decreased, the cell wiring capacitance Cwc is decreased. When the dielectric thickness Dsif or the effective dielectric thickness Dsif_e is reduced, the electric lines of force between the display electrode pairs are pushed out from a dielectric layer having a large relative dielectric constant k into a vacuum (in a discharge space) having a small relative dielectric constant k. Because it is. As a result, the panel wiring capacitance Cwp decreases from the equation (25).

  It is assumed that the power consumption Pp, the power recovery efficiency βcp, and the display discharge voltage Vs are constant under the small display rate display condition (that is, Pp≈Pcp). At this time, when the panel wiring capacitance Cwp decreases from the equation (24), the maximum drive frequency Fdr that can be driven increases. As a result, the discharge power Pdp increases from the equation (23), and the BC product Fbcs of the small display rate display set increases from the equations (14) and (13).

<Specific Embodiment of PDP>
Based on the above examination results, a specific mode for eliminating the trade-off relationship described above will be described below with reference to FIGS. In the following description, the horizontal direction shown in FIGS. 2 and 13 is the width direction of the partition wall 31. The direction perpendicular to the width direction (vertical direction in the figure) is the height direction, and the z coordinate axis is shown in the height direction. The longitudinal direction is the direction perpendicular to the width direction and the height direction (that is, the direction perpendicular to the drawing sheet).

  2 and 13, the discharge space 33 is surrounded by the protective film 27 and the phosphor 32. 2 and FIG. 13, Wds (z) and Wrb (z) are lengths in the width direction, which are the discharge space width Wds (z) and the barrier rib width Wrb (z), respectively. The discharge space width Wds (z) and the barrier rib width Wrb (z) are functions of the height direction, that is, the z coordinate. Reference numerals hds and hrb denote lengths in the height direction, which are the discharge space height hds and the barrier rib height hrb, respectively. The average value over the discharge space height hds of the discharge space width Wds (z) is the average discharge space width Wdsa. The average value of the partition wall width Wrb (z) over the partition wall height hrb is the average partition wall width Wrba. 2 and 13 show the thickness hph of the phosphor layer 32. FIG. In the comparative example shown in FIG. 13, the average partition wall width Wrba is set as small as possible and is 0.06 mm or less.

  In the PDP of the present embodiment shown in FIG. 2, the display area surface reflectance (module reflectance) β is smaller than the comparative example shown in FIG. 13 in order to improve the display performance (set BC product Fbcs) in all white display. It has become. Here, the surface on which visible light for display is emitted is a display surface, the space in which visible light is emitted from the display surface is a viewing space, and the space that continuously includes a plurality of discharge cells is a display space, The area of the display space projected onto the display surface is defined as a display area Rp, and when white light is incident on the display area Rp from the viewing space, the energy of the light emitted from the display area Rp is incident on the display area Rp. When the average value in the display region Rp of the ratio to the energy of the white light is defined as the display region surface reflectance (or module reflectance) β, it is preferable that 0.02 ≦ β ≦ 0.2 is satisfied. . In order to improve the display performance (set BC product Fbcs), it is preferable that the display area surface reflectance (module reflectance) β is smaller, but β in the above range is considered in consideration of practical materials and manufacturing conditions. To be elected. As will be described later, when the reduction of the display region surface reflectance β is realized by reducing the display discharge region area ratio Ad = Sd / Sp or increasing the black region area ratio Ab = Sb / Sp, There is a practical lower limit of the reflectance β, and the above range of the display region surface reflectance β is a range having practical value. Considering the above materials, manufacturing conditions, and structural conditions, a more preferable range of the display area surface reflectance β is 0.05 ≦ β ≦ 0.15.

  Furthermore, an example in which the display area surface reflectance β is reduced by reducing the display discharge area area ratio Ad will be described.

  The area of the display region Rp is Sp, the discharge space used for display is the display discharge space, the region of the display discharge space projected onto the display surface is the display discharge region, and the display discharge in the display region Rp When the set of regions is Rd and the area of the set Rd of display discharge regions is Sd, the display discharge region area ratio Ad = Sd / Sp preferably satisfies 0.05 ≦ Ad ≦ 0.4. In order to improve the display performance (set BC product Fbcs), it is preferable that the display discharge area ratio Ad is smaller, but Ad in the above range is selected in consideration of practical materials and manufacturing conditions. As a result, the display area surface reflectance β can be within the above range (0.02 ≦ β ≦ 0.2). A more preferable range of the display discharge area area ratio Ad is 0.2 ≦ Ad ≦ 0.3. In this case, the range of the display area surface reflectance β can be set to 0.05 ≦ β ≦ 0.15.

  An area of the discharge cell projected onto the display surface is defined as a cell area, and in at least some of the plurality of discharge cells, an area other than the display discharge area in the cell area is defined as a non-display discharge area. When white light is incident on the non-display discharge region from the visual field space, the ratio of the energy of light emitted from the non-display discharge region to the energy of the incident white light is set to 0.2 or less. Yes. This ratio is preferably as small as possible, but considering the process temperature (usually a heating step of about 500 ° C.) and material costs, the above ratio is in a range where 0.02 to 0.2 has practical value.

  In the present embodiment, in order to realize the target value of the display area surface reflectance β, the aspect of the non-display discharge area is as follows. For example, in at least some of the discharge cells, the average barrier rib width Wrba is set to 0.1 mm or more, 0.15 mm or more, 0.2 mm or more, or 0.3 mm or more. As the value of the average partition wall width Wrba increases, the display area surface reflectance (module reflectance) β can be further reduced, and the increase in all-white display performance can be made remarkable. According to the study of the present inventor, if the value of the average partition wall width Wrba is set to 0.1 mm or more, a general viewer (a person who views a display to which the present technology is applied) has a display performance in all white display. The improvement can be perceived as a display performance improvement. However, as the value of the average partition wall width Wrba is increased, the display electrode area Sse is decreased, which causes a decrease in the small display rate performance. Therefore, it is necessary to determine the thickness of the above-described dielectric thickness Dsif or effective dielectric thickness Dsif_e from the viewpoint of suppressing a decrease in small display rate display performance.

  Further, in order to make the display area surface reflectance β as small as possible, the partition walls or the partition heads (the viewing space side of the partition walls, that is, the display surface side portion) are formed of a black material. Alternatively, a black layer (usually referred to as a black band or a black matrix) is formed in the space closer to the visual field space than the partition wall in accordance with the partition wall. Here, a black material or a black layer is a material or layer having a surface reflectance of 20% or less.

  Thus, in this embodiment, the display area surface reflectance β is set to 0.2 or less, or 0.15 or less by setting the display discharge area area ratio Ad to 0.4 or less, or 0.3 or less. The display performance in all white display is improved. Here, when the display area surface reflectance β is simply set to 0.2 or less, or 0.15 or less, the display electrode area Sse decreases as described above, and the display performance (set BC product Fbcs in small display ratio display) is reduced. ) Decreases. Therefore, in the present embodiment, as described above, the value of the dielectric thickness Dsif of the front plate 2 is set to 18 μm or less, 14 μm or less, or 9 μm or less. Alternatively, by setting the effective dielectric thickness Dsif_e in consideration of the average relative dielectric constant k of the layer including the dielectric 26 and the protective film 27 to 2.2 μm or less, 1.7 μm or less, or 1.1 μm or less, Since the display performance (set BC product Fbcs) in the small display rate display can be prevented from decreasing, the all white display performance and the small display rate display performance can be improved.

  Next, a first modification of the present embodiment in which the display area surface reflectance β is achieved from the surface area ratio of the black area will be described.

  When white light is incident on the display surface from the visual field space in at least some of the plurality of discharge cells, the ratio of the energy of the light emitted from the display surface to the energy of the incident white light is A black region having a size of 0.2 or less is provided, the area of the display region Rp is Sp, the set of black regions in the display region Rp is Rb, and the area of the set Rb of black regions on the display surface is Sb. In this case, the black area ratio Ab = Sb / Sp satisfies 0.95 ≧ Ab ≧ 0.5. By setting the black area area ratio Ab within this range, the display area surface reflectance β can be kept in the above range (0.02 ≦ β ≦ 0.2). A particularly preferable range of the black area area ratio Ab is 0.8 ≧ Ab ≧ 0.7. In this case, the range of the display area surface reflectance β can be stably set to 0.05 ≦ β ≦ 0.15.

  In this case as well, when white light is incident on the black region, the ratio of the energy of the light emitted from the black region to the energy of the incident white light is preferably as small as possible, but the process temperature (usually about 500 ° C.) In consideration of the heating cost) and material costs, 0.02 to 0.2 is a practical value within the above ratio.

  Thus, in the first modification of the present embodiment, the display area surface reflectance β is 0.2 or less by setting the display discharge area area ratio Ad to 0.9 or less, or 0.8 or less. Alternatively, the display performance in all white display is improved to 0.15 or less. In the present modification, as described above, the value of the dielectric thickness Dsif of the front plate 2 is set to 18 μm or less, 14 μm or less, or 9 μm or less. Alternatively, by setting the effective dielectric thickness Dsif_e in consideration of the average relative dielectric constant k of the layer including the dielectric 26 and the protective film 27 to 2.2 μm or less, 1.7 μm or less, or 1.1 μm or less, Since the display performance (set BC product Fbcs) in the small display rate display can be prevented from decreasing, the all white display performance and the small display rate display performance can be improved.

  Further, if the area Sb of the black region becomes too large, the light emission luminance may decrease and the display device may not function, but as described above, the dielectric thickness Dsif of the front plate 2 or the dielectric 26 and If the effective dielectric thickness Dsif_e in consideration of the average relative dielectric constant k of the layer including the protective film 27 is reduced, it is possible to suppress a decrease in light emission luminance. Therefore, it is possible to increase the black region area ratio Ab. it can.

  Next, in order to realize the display area surface reflectance β, at least in some discharge cells, an area having a large surface reflectance with respect to white light viewed from the visual field space, that is, a relative white area RW and a small area, that is, a relative black color. A second modification of the present embodiment in which the region RB exists and satisfies the following conditions will be described.

  First, the reflectance is defined as the ratio of the energy of light emitted from the display surface to the energy of the incident white light when white light is incident on the display surface from the visual field space. In at least some of the discharge cells, when the maximum value of the reflectance is βmax, the at least some of the discharge cells have a relative black region RB in which the reflectance is 0.5 × βmax or less. This is set so that the following conditions are satisfied.

  That is, a space that continuously includes a plurality of discharge cells is set as a display space, a region of the display space projected onto the display surface is set as a display region Rp, an area of the display region Rp is set as Sp, and the display region Rp When the set of the relative black regions RB in FIG. 5 is a black region Rb and the area of the black region Rb on the display surface is Sb, the black region area ratio Ab = Sb / Sp is 0.95 ≧ Ab ≧ 0.5. Is to satisfy. Also in the second modified example, the black region area ratio Ab is set to 0.95 ≧ Ab ≧ 0.5 as in the first modified example, so that the display region surface reflectance β is in the above range (0). .02 ≦ β ≦ 0.2). A particularly preferable range of the black area area ratio Ab is 0.8 ≧ Ab ≧ 0.7. In this case, the range of the display area surface reflectance β can be stably set to 0.05 ≦ β ≦ 0.15.

  Thus, in the second modification of the present embodiment, the display area surface reflectance β is 0.2 or less by setting the display discharge area area ratio Ad to 0.9 or less, or 0.8 or less. Alternatively, the display performance in all white display is improved to 0.15 or less. In the present modification, as described above, the value of the dielectric thickness Dsif of the front plate 2 is set to 18 μm or less, 14 μm or less, or 9 μm or less. Alternatively, by setting the effective dielectric thickness Dsif_e in consideration of the average relative dielectric constant k of the layer including the dielectric 26 and the protective film 27 to 2.2 μm or less, 1.7 μm or less, or 1.1 μm or less, Since the display performance (set BC product Fbcs) in the small display rate display can be prevented from decreasing, the all white display performance and the small display rate display performance can be improved.

  Further, if the area Sb of the black region becomes too large, the light emission luminance may decrease and the display device may not function, but as described above, the dielectric thickness Dsif of the front plate 2 or the dielectric 26 and If the effective dielectric thickness Dsif_e in consideration of the average relative dielectric constant k of the layer including the protective film 27 is reduced, it is possible to suppress a decrease in light emission luminance. Therefore, it is possible to increase the black region area ratio Ab. it can.

  In the comparative example shown in FIG. 13, as shown by A7, the display discharge area ratio Ad is reduced or the black area area ratio Ab is increased in order to improve the display performance (set BC product Fbcs) in all white display. As a result, the display electrode area Sse in each discharge cell inevitably decreases, and as a result, the display performance (set BC product Fbcs) in the small display rate display rapidly decreases. In the present embodiment, in order to overcome this trade-off problem, the dielectric thickness Dsif or the effective dielectric thickness Dsif_e of the front plate is reduced as compared with the comparative example, as described in A10 and related parts. is there. The optimum value of the dielectric thickness Dsif or the effective dielectric thickness Dsif_e varies depending on the actual cell structure, cell material, and desired display image characteristics. In consideration of these conditions, as described above, the effective dielectric thickness Dsif is set to 18 μm or less, 14 μm or less, or 9 μm or less, or the relative dielectric constant of the dielectric 26 and the protective film 27 is considered. It is effective to set Dsif_e to 2.2 μm or less, 1.7 μm or less, or 1.1 μm or less.

  In panel driving, an electric field is formed in the dielectric 26 of the front plate 2, and this electric field strength increases when the dielectric thickness Dsif or the effective dielectric thickness Dsif_e decreases. As a result of this increase in electric field strength, the dielectric itself may be broken due to dielectric breakdown or the like. In the present embodiment, a material or a process that does not cause such insulator breakdown is used for the dielectric 26 of the front plate 2.

  As described above, when the dielectric thickness Dsif or the effective dielectric thickness Dsif_e is decreased, the reactive power Pcp decreases, and as a result, the small display rate display performance (BC product Fbcs of the small display rate display set) is further improved. .

(Embodiment 2)
10 to 12 are schematic views of the plasma display panel (basic PDP) according to the second embodiment. FIG. 10 is a main part enlarged plan view showing a part of a plane viewed from the view space side. FIGS. 11 and 12 are enlarged cross-sectional views of the main part showing a part of the cross section viewed from the direction of D1 and D2 shown in FIG. Hereinafter, differences between the present embodiment and the first embodiment will be described.

  First, in this embodiment, the partition has a box partition structure. That is, the partition walls 31 are arranged in a lattice shape so as to extend along two intersecting directions DR1 and DR2, and these directions coincide with D1 and D2 in the drawing. In the same manner as described in the first embodiment, the average partition wall width Wrba is determined with respect to the partition wall constituent portions whose longitudinal direction is at least two directions (DR1 and DR2). In at least some of the discharge cells, the average barrier rib width Wrba of the barrier ribs whose longitudinal direction is arranged in the two directions, that is, at least one of DR1 and DR2, is 0.1 mm or more, 0.15 mm or more, 0.2 mm or more. Or 0.3 mm or more. As the value of the average partition wall width Wrba increases, the display area surface reflectance (module reflectance) β can be further reduced, and the increase in all-white display performance can be made remarkable. According to the study of the present inventor, if the value of the average partition wall width Wrba is set to 0.1 mm or more, a general viewer (a person who views a display to which the present technology is applied) has a display performance in all white display. The improvement can be perceived as a display performance improvement. However, as the value of the average partition wall width Wrba is increased, the display electrode area Sse is decreased, which causes a decrease in the small display rate performance. Therefore, it is necessary to determine the thickness of the above-described dielectric thickness Dsif or effective dielectric thickness Dsif_e from the viewpoint of suppressing a decrease in small display rate display performance.

  Another difference of the present embodiment is that display discharge electrode pairs (X electrode and Y electrode) are arranged opposite to each other. That is, the Y electrode 230 and the Y bus electrode 250 are installed on the front glass substrate 21, and the X electrode 220 is installed on the rear glass substrate 28 so as to face the Y electrode in the height direction. The viewing space exists on the opposite side of the front plate with respect to the front plate. The X electrode 220 on the back plate side does not need to transmit visible light and does not necessarily need to be a transparent electrode. Both the X electrode and the Y electrode are covered with dielectrics 26 and 30 and a protective film 27. The phosphor 32 is applied only to the side wall of the partition wall 31 and is not applied on the protective film 27 covering the X electrode and the Y electrode. The height h shown in FIGS. 11 and 12 is the height of the cell, the height of the barrier ribs 31 or the height of the discharge space 33.

  By disposing the display discharge electrode pairs in this manner, it is not necessary for one of the display discharge electrode pairs (X electrode) and the display electrode gap Wgxy (see FIG. 3) to occupy a part of the display area. That is, the display discharge region area Sd is reduced, and the display discharge region area ratio Ad can be reduced. Therefore, it becomes easy to reduce the display area surface reflectance β.

  In order to increase the ultraviolet emission efficiency of the discharge and increase the module luminous efficiency, it is necessary to increase the pd product of the discharge. The pd product is a product (multiplication) of the gas pressure p of the discharge gas and the distance d between the discharge electrodes. In the present embodiment, the distance d between the discharge electrodes is the discharge space height h. The value of the height h of the discharge space 33 necessary for obtaining sufficient ultraviolet ray generation efficiency varies depending on the gas pressure p and the cell structure. In general, the height h of the discharge space 33 needs to be 0.05 mm or more, 0.1 mm or more, 0.2 mm or more, 0.3 mm or more, or 0.5 mm or more depending on the situation. The larger the height h of the discharge space 33 is, the larger the ultraviolet ray generation efficiency can be obtained. On the other hand, it is necessary to form the barrier rib 31 having a large barrier rib aspect ratio Arbas, which increases the manufacturing cost. The partition wall aspect ratio Arbas is h / Wrba. The value of the height h of the discharge space is determined by comprehensively considering these merits (increased ultraviolet ray generation efficiency) and demerits (increased manufacturing cost). According to the study of the present inventor, these criteria for comprehensive judgment (emphasis on merit and demerit suppression) change significantly in the stepwise value of the height h of the discharge space described above.

  In order to realize the height h of the discharge space 33, for example, the following structure is required. That is, the coordinate axis z is taken in the height direction of the PDP 200, the position coordinate of the coordinate axis z of the X electrode as the display electrode is zX, the position coordinate of the coordinate axis z of the Y electrode is zY, and the position coordinate zX The absolute value | zY−zX | of the difference of zY needs to be 0.05 mm or more, 0.1 mm or more, 0.2 mm or more, 0.3 mm or more, or 0.5 mm or more.

  Further, when the height h of the discharge space 33 is increased, the discharge space aspect ratio Adsas = h / Wdsa is also increased. When the discharge space aspect ratio is increased, the visible light emitted from the phosphor 32 is reflected multiple times on the surface of the phosphor 32 or the surface of the protective film 27 on the back plate (or the surface of the dielectric 26 on the back plate) and enters the viewing space. Come out. Therefore, in order to effectively use visible light, the surface reflectance of the surface of the phosphor 32 or the surface of the protective film 27 of the back plate (or the surface of the dielectric 26 of the back plate) (this is referred to as non-aperture surface reflectance). It needs to be bigger. This non-aperture surface reflectance is usually about 60%, and it is desirable to make it 80% or more or 90% or more. According to the study of the present inventor, by setting the non-aperture surface reflectance to 80%, a general viewer (a person viewing a display to which the present technology is applied) can clearly detect the brightness improvement. Can do. Moreover, if it is set to 90% or more, it can be sensed that it is further improved compared to 80%.

  As the height h of the discharge space 33 is increased, it is necessary to increase the non-opening surface reflectance. The non-aperture surface reflectance can be explained as follows. That is, a solid wall surrounding the display discharge space in the discharge cell is an inner surface of the display discharge space, and a surface of the inner surface of the display discharge space from which visible light for display is emitted toward a viewing space is an opening surface. Of the inner surface of the space, a solid wall other than the opening surface is a non-opening surface, and the average value of the surface reflectance of the non-opening surface is a non-opening surface reflectance.

  Although the invention made by the inventors of the present application has been specifically described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

  For example, in Embodiment 2, the structure of the basic PDP has been described, but this can be applied to the plasma display device shown in FIG. 4 or 8 described in the embodiment.

  The present invention is widely applicable to plasma display devices such as plasma display panels.

1,200 PDP (Plasma Display Panel, Basic Plasma Panel)
2 Front plate 3 Back plate 21 Front glass substrates 22-1, 22-2, 220 X electrodes 23-1, 23-2, 230 Y electrodes 24-1, 24-2 X bus electrodes 25-1, 25-2, 250 Y bus electrode 26 Dielectric (dielectric film)
27 Protective film 28 Rear glass substrate 29 A electrode (address electrode)
30 Dielectric (Dielectric film)
31 Bulkhead (rib)
32 phosphor 33 discharge space 40 TV field 41-48 subfield 49 preliminary discharge period 50 address discharge period 51 display period (issue display period)
52 waveforms (voltage waveform applied to one A electrode)
53 Waveform (Voltage waveform applied to X electrode)
54 waveform (voltage waveform applied to the i-th electrode of the Y electrode)
55 Waveform (Voltage waveform applied to i + 1th electrode of Y electrode)
56 scan pulse (scan pulse applied to the i-th row of the Y electrode)
57 scan pulse (scan pulse applied to the (i + 1) th row of the Y electrode)
58 Voltage waveform (Voltage waveform applied to X electrode)
59 Voltage waveform (voltage waveform applied to Y electrode)
100 Plasma display device 101 Driving means (driving circuit)
102 image source Dsif dielectric thickness hds discharge space height hrb partition wall height hph thickness Wds (z) discharge space width Wdsa average discharge space width Wrb (z) partition wall width Wrba average partition wall width h height

Claims (12)

X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
When white light is incident on the display area from the visual field space, the average value in the display area of the ratio of the energy of light emitted from the display area to the energy of the incident white light is reflected on the display area. If the rate is β,
0.02 ≦ β ≦ 0.2,
A plasma characterized in that Dsif is 18 μm or less, where the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif. Display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
The area of the display region Rp is Sp,
A space where the display discharge occurs in the discharge space is a display discharge space,
A region projected onto the display surface of the display discharge space is a display discharge region,
A set of the display discharge regions in the display region Rp is Rd,
The area of the set Rd of the display discharge regions is Sd,
When Ad = Sd / Sp is a display discharge area ratio,
0.05 ≦ Ad ≦ 0.4,
A plasma characterized in that Dsif is 18 μm or less, where the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif. Display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
The area of the display region Rp is Sp,
When at least some of the plurality of discharge cells have white light incident on the display surface from the visual field space, the energy of the light emitted from the display surface is reduced. Having a black area with a ratio to energy of 0.2 or less;
A set of the black areas in the display area Rp is Rb,
The area on the display surface of the set of black regions Rb is Sb,
When Ab = Sb / Sp is a black area area ratio,
0.95 ≧ Ab ≧ 0.5,
A plasma characterized in that Dsif is 18 μm or less, where the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif. Display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
The area of the display region Rp is Sp,
When white light is incident on the display surface from the visual field space, the ratio of the energy of light emitted from the display surface to the energy of the incident white light is defined as a reflectance.
When the maximum value of the reflectance of the plurality of discharge cells is βmax, at least some of the discharge cells have a black region where the reflectance is 0.5 × βmax or less,
The set of black areas in the display area Rp is Rb, the area of the set of black areas Rb on the display surface is Sb,
When Ab = Sb / Sp is a black area area ratio,
0.95 ≧ Ab ≧ 0.5,
A plasma characterized in that Dsif is 18 μm or less, where the average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is the dielectric thickness Dsif. Display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
When white light is incident on the display area from the visual field space, the average value in the display area of the ratio of the energy of light emitted from the display area to the energy of the incident white light is reflected on the display area. If the rate is β,
0.02 ≦ β ≦ 0.2,
The average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is defined as the dielectric thickness Dsif, and the dielectric film is positioned at the position overlapping the X electrode. If the relative dielectric constant and the average value of the relative dielectric constant at the position overlapping with the Y electrode is the dielectric relative dielectric constant k, and Dsif_e = Dsif / k is the effective dielectric thickness, Dsif_e is 2.2 μm or less. A characteristic plasma display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
The area of the display region Rp is Sp,
A space where the display discharge occurs in the discharge space is a display discharge space,
A region projected onto the display surface of the display discharge space is a display discharge region,
A set of the display discharge regions in the display region Rp is Rd,
The area of the set Rd of the display discharge regions is Sd,
When Ad = Sd / Sp is a display discharge area ratio,
0.05 ≦ Ad ≦ 0.4,
The average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is defined as the dielectric thickness Dsif, and the dielectric film is positioned at the position overlapping the X electrode. If the relative dielectric constant and the average value of the relative dielectric constant at the position overlapping with the Y electrode is the dielectric relative dielectric constant k, and Dsif_e = Dsif / k is the effective dielectric thickness, Dsif_e is 2.2 μm or less. A characteristic plasma display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
The area of the display region Rp is Sp,
When at least some of the plurality of discharge cells have white light incident on the display surface from the visual field space, the energy of the light emitted from the display surface is reduced. Having a black area with a ratio to energy of 0.2 or less;
A set of the black areas in the display area Rp is Rb,
The area on the display surface of the set of black regions Rb is Sb,
When Ab = Sb / Sp is a black area area ratio,
0.95 ≧ Ab ≧ 0.5,
The average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is defined as the dielectric thickness Dsif, and the dielectric film is positioned at the position overlapping the X electrode. If the relative dielectric constant and the average value of the relative dielectric constant at the position overlapping with the Y electrode is the dielectric relative dielectric constant k, and Dsif_e = Dsif / k is the effective dielectric thickness, Dsif_e is 2.2 μm or less. A characteristic plasma display device. X and Y electrodes for performing display discharge, a dielectric film that at least partially covers the X and Y electrodes, a discharge gas filled in a discharge space, and excitation by ultraviolet rays generated by the discharge of the discharge gas A plasma display panel including a plurality of discharge cells including at least a phosphor that emits visible light;
A driving circuit for driving the plasma display panel,
In the plasma display panel, a surface on which the visible light for display is emitted is a display surface,
A space in which the visible light is radiated from the display surface is a viewing space,
A space that continuously includes the plurality of discharge cells as a display space,
A region projected onto the display surface of the display space is a display region Rp,
The area of the display region Rp is Sp,
When white light is incident on the display surface from the visual field space, the ratio of the energy of light emitted from the display surface to the energy of the incident white light is defined as a reflectance.
When the maximum value of the reflectance of the plurality of discharge cells is βmax, at least some of the discharge cells have a black region where the reflectance is 0.5 × βmax or less,
The set of black areas in the display area Rp is Rb, the area of the set of black areas Rb on the display surface is Sb,
When Ab = Sb / Sp is a black area area ratio,
0.95 ≧ Ab ≧ 0.5,
The average value of the thickness of the dielectric film at the position overlapping the X electrode and the thickness at the position overlapping the Y electrode is defined as the dielectric thickness Dsif, and the dielectric film is positioned at the position overlapping the X electrode. If the relative dielectric constant and the average value of the relative dielectric constant at the position overlapping with the Y electrode is the dielectric relative dielectric constant k, and Dsif_e = Dsif / k is the effective dielectric thickness, Dsif_e is 2.2 μm or less. A characteristic plasma display device. In the plasma display device according to any one of claims 1 to 8,
The barrier ribs formed in a lattice shape extending in two intersecting directions form part of the plurality of discharge cells,
In the discharge cells of at least some of the plurality of discharge cells, the barrier ribs extending in at least one of the two directions have an average width of the barrier ribs of 0.1 mm or more. Plasma display device. The plasma display device according to claim 9, wherein
Taking the coordinate axis z in the height direction of the partition, the position coordinate of the coordinate axis z of the X electrode is zX, the position coordinate of the coordinate axis z of the Y electrode is zY,
An absolute value | zY−zX | of a difference between the position coordinates zX and zY is 0.05 mm or more. The plasma display device according to claim 10, wherein
In each of the plurality of discharge cells, a solid wall surrounding the display discharge space is an inner surface of the display discharge space,
Of the inner surface of the display discharge space, a surface from which the visible light for display radiates toward the visual field space is an opening surface,
Of the display discharge space inner surface, a solid wall other than the opening surface is a non-opening surface,
When the average value of the surface reflectance of the non-opening surface is defined as the non-opening surface reflectance,
The plasma display apparatus according to claim 1, wherein the non-opening surface reflectance is 80% or more in at least some of the plurality of discharge cells. In the plasma display device according to any one of claims 1 to 8,
A plurality of barrier ribs extending along a first direction and arranged in a second direction orthogonal to the first direction form part of the plurality of discharge cells, and the plurality of discharge cells In at least some of the discharge cells, an average value of the widths of the plurality of barrier ribs is 0.1 mm or more.

Images