JP2006030844A - Plasma display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an image of high quality by simultaneously improving the white display luminance and bright contrast of a plasma display apparatus. <P>SOLUTION: A plasma display panel 38 has an optical reflection/absorption filter 40 arranged on the front at a prescribed distance (d). The optical reflection/absorption filter 40 is constituted of successively forming a visible light absorption layer 44, a visible light reflection layer 46 and a protection coat 50 which are island-like patterns on the rear face of a transparent substrate 42. Incident light from an external light source is absorbed by the visible light absorption layer 44 and visible light generated by discharge can be effectively extracted to the outside by reflecting the visible light between the visible light reflection layer 46 and a phosphor layer. By suitably setting the aperture of an island-like pattern of two-layer structure, white display luminance and bright contrast can be simultaneously and sharply improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical reflection / absorption filter and a plasma display device using the same.

  In recent years, a display device using a plasma display panel has been put into practical use as a large-screen, thin, and lightweight display device for a digital television, an information display device, and the like. In this plasma display panel (PDP), a discharge gas is sealed between two glass substrates, a plurality of matrix-like micro discharge spaces provided with phosphors are arranged, and generated by gas discharge in the micro discharge space. The phosphor is excited by the ultraviolet rays to be used, and the visible light generated thereby is used for displaying information. For example, FIG. 13 shows a cross-sectional view of this optical filter and one discharge cell in the PDP in a plasma display device having an optical filter arranged at a predetermined distance in front of the PDP. A plurality of mainly transparent display electrodes (not shown) having a discharge interval on the back surface of the transparent front substrate, a dielectric layer (not shown) formed so as to cover the display electrodes, and the dielectric layer A protective film (not shown) made of MgO formed thereon is sequentially formed to constitute the front panel 800.

  In the rear panel 802, an address electrode 806 for writing data, a base dielectric layer 808, a partition wall 810 extending in a vertical direction (perpendicular to the rear substrate), and a phosphor layer 812 are formed on a rear substrate 804 made of glass. Yes. The display electrode in the front panel 800 and the address electrode 806 between the partition walls 810 are opposed to each other so as to be orthogonal to each other, and the front panel 800 and the back panel 802 are sealed with glass. In the space between the front panel 800 and the back panel 802 configured as described above, discharge cells 814 are formed in a space surrounded by two partition walls. The discharge cell 814 is filled with a mixed gas of neon (Ne) and xenon (Xe) as a discharge gas. In the PDP configured as described above, in order to write data to the designated discharge cell of the display screen composed of a large number of discharge cells, a voltage is applied to the address electrode and the display electrode of the corresponding discharge cell to cause discharge, Further, a signal is displayed by causing discharge in the discharge gap of the display electrode. In this way, the PDP 816 is configured.

  On the front surface of the PDP 816 configured in this manner, an optical filter in which an antireflection film 820 and a hard layer (not shown) for preventing scratches due to external contact are formed on a transparent or colored substrate 818 is predetermined. It is arranged with a space. This optical filter has a role of improving contrast by absorbing or irregularly reflecting external light in the visible light wavelength region. That is, the incident light indicated by the arrow 826 from the external light source 824 to the optical filter 822 becomes the transmitted light indicated by the arrow 828 attenuated through the optical filter 822. Further, the transmitted light is reflected by the white phosphor layer 812, becomes reflected light indicated by an arrow 830, attenuates again through the optical filter 822, and is received by the human eye as visible light of outside light indicated by an arrow 832. Is done. On the other hand, the phosphor layer 812 is irradiated with ultraviolet rays generated by discharge in the discharge cell in accordance with the signal, and the generated visible light indicated by the arrow 834 is transmitted through the optical filter 822 and attenuated visible light indicated by the arrow 836. As received by human eyes. The bright place contrast is defined by a ratio of visible light indicated by an arrow 836 to visible light indicated by an arrow 832. The outside light passes through the optical filter 822 twice and greatly attenuates, whereas the light generated from the phosphor layer 812 passes through the optical filter 822 only once, thereby reducing the light filter contrast. Has improved. On the other hand, the luminance (hereinafter referred to as white display luminance) decreases with a decrease in the transmittance of the optical filter (see, for example, Non-Patent Document 1 and Non-Patent Document 2).

Moreover, in order to prevent electromagnetic waves and near infrared rays generated by the discharge from being emitted to the front surface of the plasma display device, a conductive film or a conductive mesh filter is provided on the substrate capable of attenuating the near infrared rays. It has been proposed to configure. For example, by providing a lattice-like conductive thin film having a lattice spacing of 200 μm or less and a thickness of 20 μm or less on at least one surface of a transparent substrate having an average light transmittance of 30% or less at a wavelength of 800 nm to 1000 nm, It has been proposed to shield infrared rays (see, for example, Patent Document 1).
Matsumoto: “Electronic Display”, Ohm, pp106-107 (issued July 1995) Uchiyama, Mikoshiba: “All about plasma displays”, Industrial Research Committee, pp208 (issued in September 2002) JP 2000-137442 A

  However, in Non-Patent Document 1 and Non-Patent Document 2, from an external light that has reappeared on the front surface of the optical filter by passing twice by an optical filter whose transmittance has been reduced to improve bright place contrast, that is, from PDP On the other hand, the white display luminance of visible light emitted in the discharge cell is also greatly reduced. As described above, in the conventional optical filter, there is a problem that it is difficult to satisfy these characteristics at the same time because the external light and the visible light emitted in the discharge cell are opposite to each other. Patent Document 1 describes a proposal of a grid-like conductive thin film that exhibits an effect on electromagnetic waves and near infrared rays, but does not have an effect on visible light.

  The present invention has been made to solve the above-described problems, and provides a plasma display device including an optical reflection / absorption filter that improves white display luminance of visible light and simultaneously improves bright place contrast. With the goal.

  In order to solve the above-described problems, the plasma display device of the present invention includes a scan electrode and a sustain electrode that extend at least in the horizontal direction on the back surface of the transparent front substrate and are arranged in parallel in the vertical direction to form a discharge gap. A front panel in which a plurality of display electrodes, a dielectric layer covering the display electrodes, and a protective layer covering the dielectric layer are sequentially formed, and an insulating back substrate extending at least in the vertical direction and in the horizontal direction A plurality of address electrodes arranged in parallel; a base dielectric layer formed so as to cover the address electrodes; a partition wall disposed on the base dielectric layer and at least at both end positions in the lateral direction of each address electrode; A plasma display panel having a discharge cell formed at a position where the address electrode and the display electrode intersect with each other through a discharge space. And a visible light absorbing layer and a visible light reflecting layer having an opening portion and a non-opening portion on a transparent substrate, and a protective film, and are arranged at a predetermined distance from the surface of the plasma display panel. The optical reflection / absorption filter is provided, and information is displayed by discharging at least between the address electrode and the display electrode, and between the scan electrode and the sustain electrode in the discharge cell.

  According to such a configuration, the external light is absorbed by the visible light absorption layer, and the visible light generated by the discharge in the discharge cell is absorbed by another material by repeated reflection between the visible light reflection layer and the phosphor layer. Without being done, it can be taken out effectively. As a result, a high-quality plasma display device having excellent white display luminance and bright place contrast can be realized.

  In addition, a visible light reflecting layer and a visible light absorbing layer having an opening portion and a non-opening portion are formed on the surface of the transparent front substrate, and a transparent protective film is formed to integrally form an optical reflection / absorption filter. And a plurality of display electrodes comprising scan electrodes and sustain electrodes extending in the horizontal direction and arranged in parallel in the vertical direction on the rear surface of the front substrate, and a dielectric layer covering the display electrodes; A front panel in which a protective layer covering the dielectric layer is sequentially formed, a plurality of address electrodes extending at least in a vertical direction and arranged in parallel in a horizontal direction on an insulating back substrate, and so as to cover the address electrodes A base dielectric layer formed; a partition disposed on the base dielectric layer at least at both ends in the lateral direction of each address electrode; and a phosphor layer formed on the base dielectric layer in the partition Having a back panel and A plasma display panel is formed which has a discharge cell formed at a position where the address electrode and the display electrode intersect with each other via a discharge space, and at least between the address electrode and the display electrode and between the scan electrode and the sustain electrode in the discharge cell. The information may be displayed by discharging the battery.

  According to such a configuration, since the optical reflection / absorption filter is integrally formed with the front panel of the PDP, the external light is absorbed by the visible light absorption layer, and the visible light emitted in the discharge cell is visible light. In addition to being able to be taken out effectively by the reflective layer, it is possible to realize a high-quality plasma display device equipped with a PDP that hardly causes interference between visible light generated in both the discharge cell and the adjacent discharge cell.

  A plurality of display electrodes comprising scan electrodes and sustain electrodes extending in the horizontal direction at least on the back surface of the transparent front substrate and forming a discharge gap; and a dielectric layer covering the display electrodes; Formed so as to cover the address electrodes, a front panel in which a protective layer covering the dielectric layer is sequentially formed, a plurality of address electrodes extending in the vertical direction and arranged side by side on the insulating back substrate. An underlying dielectric layer, partition walls disposed on at least both ends in the lateral direction of each address electrode on the underlying dielectric layer, and a phosphor layer formed on the underlying dielectric layer in the partition wall Visible light absorption having a plasma display panel in which a discharge cell is formed at a position where the address electrode and the display electrode intersect by joining a back panel through a discharge space, and an opening and a non-opening on a transparent substrate layer And an optical reflection / absorption filter having a visible light reflection layer and a protective coating, and disposed at a predetermined distance substantially parallel to the surface of the plasma display panel, and on the front surface of the optical reflection / absorption filter A multifunctional optical filter having at least one function of antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention, and at least between the address electrode and the display electrode, the scan electrode, and the sustain in the discharge cell. It may be configured to display information by discharging between electrodes.

  According to such a configuration, it has at least one function of antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention, and external light is absorbed by the visible light absorption layer, and visible light generated by discharge in the discharge cell. By repeating reflection between the visible light reflection layer and the phosphor layer, light can be effectively extracted outside without being absorbed by other materials. As a result, a high-quality plasma display device having excellent white display luminance and bright place contrast can be realized.

  In addition, a visible light reflecting layer and a visible light absorbing layer having an opening portion and a non-opening portion are formed on the surface of the transparent front substrate, and a transparent protective film is formed to integrally form an optical reflection / absorption filter. And a plurality of display electrodes comprising scan electrodes and sustain electrodes extending in the horizontal direction and arranged in parallel in the vertical direction on the rear surface of the front substrate, and a dielectric layer covering the display electrodes; A front panel in which a protective layer covering the dielectric layer is sequentially formed, a plurality of address electrodes extending at least in a vertical direction and arranged in parallel in a horizontal direction on an insulating back substrate, and so as to cover the address electrodes A base dielectric layer formed; a partition disposed on the base dielectric layer at least at both ends in the lateral direction of each address electrode; and a phosphor layer formed on the base dielectric layer in the partition Having a back panel and Plasma display panel joined through a discharge space and having a discharge cell at a position where the address electrode and the display electrode intersect, and antireflection, color correction, electromagnetic wave shielding arranged in front of the optical reflection / absorption filter A multi-function optical filter having at least one function of preventing near infrared rays, and displaying information by discharging at least between the address electrode and the display electrode, and between the scan electrode and the sustain electrode in a discharge cell. There may be.

  According to such a configuration, since it has at least one function of antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention and an optical reflection / absorption filter is integrally formed with the front panel of the PDP, The visible light absorbing layer absorbs external light and the visible light emitted in the discharge cell can be effectively extracted by the visible light reflecting layer, and between visible light generated in both the discharge cell and the adjacent discharge cell. Therefore, it is possible to realize a high-quality plasma display device including a PDP that hardly causes interference.

  Furthermore, the visible light absorption layer is composed of vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) oxide or compound, carbon Further, the optical reflection / absorption filter which is a material selected from an organic material in which black fine particles are dispersed and a glass in which black fine particles are dispersed may be provided.

  According to such a configuration, it is possible to realize a high-quality plasma display device including an optical reflection / absorption filter that can effectively absorb visible light from an external light source and can be formed of a heat-resistant material.

Further, the visible light reflecting layer is made of gold (Au), silver (Ag), copper (Cu), tin (Sn), chromium (Cr), aluminum (Al), titanium (Ti), silicon (Si), molybdenum. (Mo) and metal materials composed of alloys thereof, titanium oxide (TiO ₂ ), barium oxide (BaO), zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), lead oxide (PbO ₂ ), magnesium oxide ( And an optical reflection / absorption filter which is a material selected from organic resin or glass in which white metal oxide particles containing at least one of (Mg ₂ O) and particles having excellent light scattering properties are dispersed. It may be a configuration.

  According to such a configuration, the optical reflection / absorption filter capable of reflecting visible light generated in the discharge cell between the visible light reflection layer and the phosphor layer and effectively extracting visible light to the outside is provided. An image quality plasma display device can be realized.

  Furthermore, the optical reflection / absorption filter may have an aperture ratio in the range of 15% to 29%.

  According to such a configuration, it is possible to realize a high-quality plasma display device including an optical reflection / absorption filter that simultaneously improves white display luminance and bright place contrast.

  Further, the transmittance b ′ of the multifunctional optical filter is 30% or more, and the aperture ratio of the optical reflection / absorption filter is from 0.122 × 100 / (b′−0.179) to 0.3 ×. The configuration may be in the range of 100 / b ′%.

  According to such a configuration, according to the transmittance of the multifunctional optical filter having at least one of the functions of antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention disposed in front of the optical reflection / absorption filter. By setting the aperture ratio of the optical reflection / absorption filter, it is possible to realize a high-quality plasma display device that effectively demonstrates the functions of the multi-function optical filter and simultaneously improves white display brightness and bright place contrast. .

  The planar shape of the non-opening portion of the optical reflection / absorption filter may be an island shape.

  According to such a configuration, the external light is absorbed by the island-like visible light absorption layer, and the visible light generated by the discharge in the discharge cell is repeatedly reflected between the island-like visible light reflection layer and the phosphor layer. It can be taken out effectively without being absorbed by other materials. Thereby, it is possible to realize a plasma display device capable of improving white display brightness and bright place contrast.

  Furthermore, the planar shape of the non-opening portion of the optical reflection / absorption filter may be a mesh shape.

  According to such a configuration, the external light is absorbed by the mesh-like visible light absorption layer, and the visible light generated by the discharge in the discharge cell is repeatedly reflected between the mesh-like visible light reflection layer and the phosphor layer. It can be taken out effectively without being absorbed by other materials. Thereby, it is possible to realize a plasma display device capable of improving white display brightness and bright place contrast.

  The planar shape of the non-opening portion of the optical reflection / absorption filter may be a stripe shape.

  According to such a configuration, the external light is absorbed by the striped visible light absorbing layer, and the visible light generated by the discharge in the discharge cell is repeatedly reflected between the striped visible light reflecting layer and the phosphor layer. It can be taken out effectively without being absorbed by other materials. Thereby, it is possible to realize a plasma display device capable of improving white display brightness and bright place contrast.

  The width of the opening or the diameter of the optical reflection / absorption filter is 50% or less of the discharge cell.

  According to such a configuration, at least one optical reflection / absorption filter opening corresponds to one discharge cell, and the optical reflection / light-contrast that can optimally set the white display luminance and the bright place contrast is provided. A high-quality plasma display device including an absorption filter can be realized.

  According to the plasma display device of the present invention, the island-patterned optical reflection / absorption filter having a visible light absorbing layer on the front side and a visible light reflecting layer on the back side is arranged at a predetermined interval substantially parallel to the front surface of the PDP. The visible light absorption layer can absorb a part of the external light and greatly reduce the transmittance by being placed and disposed on the front panel of the PDP. Furthermore, visible light generated from the phosphor layer in the discharge cell passes directly through the opening, or a part of the generated visible light is reflected by the visible light reflecting layer and repeatedly reflected on the phosphor layer and the barrier ribs. By effectively releasing to the outside, the white display luminance can be greatly improved. Therefore, it is possible to realize a plasma display device that can simultaneously improve the white display luminance and the bright place contrast.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 2A shows a perspective view of the main part of the plasma display device according to Embodiment 1 of the present invention, and shows a configuration in which the front panel and the rear panel are separated for easy understanding of the PDP. FIG. 2B is an enlarged plan view of the island pattern viewed from the front side of the optical reflection / absorption filter according to Embodiment 1 of the present invention. FIG. 3 shows the configuration and manufacturing process of the optical reflection / absorption filter according to Embodiment 1 of the present invention. Hereinafter, the configuration and the manufacturing method will be described with reference to FIGS.

First, the front panel 2 will be described. A plurality of pairs of transparent ITO scan electrodes 8 and sustain electrodes 10 facing each other through a predetermined discharge gap 6 for discharge on a front substrate 4 made of high strain point glass or soda lime glass using a photolithographic technique or the like. Are formed in stripes extending in the lateral direction. In FIG. 2, only a pair of scan electrode 8 and sustain electrode 10 and sustain electrode 16 and scan electrode 14 adjacent thereto are displayed. A silver (Ag) paste is screen-printed and fired in stripes on the surface ends of the sustain electrodes 10 and the scan electrodes 8 opposite to the discharge gaps 6 to form the scan electrodes 8 and the sustain electrodes 10. The display electrodes 18 are formed by forming striped Ag bus electrodes 12 extending in the horizontal direction. In this way, a metal film such as Ag is formed on the ITO film having a high resistance value, and apparently the resistance of the display electrode 18 is reduced, and a plurality of pairs configured to face each other with a predetermined discharge gap 6 therebetween. The display electrodes 18 are juxtaposed in the vertical direction. In addition, although indium tin oxide (ITO) was used as the material of the transparent electrode, tin oxide (SnO ₂ ) may be used. Next, a Pb—B based low melting point glass paste is mask screen printed and fired to form a transparent dielectric layer 20. Further, the front panel 2 is manufactured by forming a protective film 22 containing MgO as a main component by electron beam evaporation. As the constituent material of the bus electrode, an Ag film, an aluminum (Al) film, and a laminated film of chromium (Cr) / copper (Cu) / Cr are also effective.

  Next, the back panel 36 will be described. An Ag paste is screen-printed on a back substrate 24 made of high strain point glass or soda lime glass, and a plurality of address electrodes 26 for writing data are formed so as to extend in the vertical direction and be arranged in parallel in the horizontal direction. Further, on the back substrate 24 on which the address electrode 26 is formed, a Pb-B low melting point glass paste is formed by a screen printing method, and a base dielectric layer 28 is formed by a die coating method or a mask screen printing method, Sinter.

Next, a Pb—B glass paste containing metal powder such as alumina (Al ₂ O ₃ ) is repeatedly printed on the underlying dielectric layer 28 by screen printing and fired, extending in the vertical direction and in the horizontal direction. The vertical partition walls 30 arranged in parallel at predetermined intervals are formed, and then the red (R), green (G), and blue (B) phosphors are disposed in the plurality of adjacent concave portions 32 that are disposed in the horizontal direction. The phosphor layer 34 is formed by applying and baking the ink or paste contained therein, and the back panel 36 is configured.

  The front panel 2 and the back panel 36 thus configured are opposed to each other so that the display electrodes 18 and the address electrodes 26 are orthogonal to each other, and are bonded together using sealing glass. As a result, a plurality of discharge cells are formed at positions where the plurality of display electrodes on the front panel and the plurality of address electrodes on the rear panel are orthogonal to each other. After each discharge cell is evacuated to a high vacuum, a mixed gas of neon (Ne) and xenon (Xe) is filled as a discharge gas at a predetermined pressure to produce a PDP 38.

  The optical reflection / absorption filter 40 of the present invention is arranged at a predetermined distance d on the front side of the PDP 38. The predetermined distance d is a distance at which the arrangement of the optical reflection / absorption filter 40 does not affect the conditions and heat dissipation conditions of the conventional PDP, and the optical reflection / absorption filter 40 to be arranged is caused by heat from the PDP. An unaffected distance is chosen and is generally about 2.5 mm.

  FIG. 2B shows an enlarged view of a region indicated by a circle 5 in FIG. The optical reflection / absorption filter 40 of the present invention includes an opening 1 and a non-opening 3 formed on a transparent substrate 42, and the plurality of non-openings 3 form an island pattern. As described above, the island-shaped non-opening 3 is electrically discontinuous with the adjacent non-opening 3.

  Next, the manufacturing method of the optical reflection / absorption filter of the present invention will be described with reference to FIG. In FIG. 3A, a visible light absorbing layer 44 made of black chrome is formed on the back surface of a transparent glass substrate 42 by plating. Next, in FIG. 3B, a visible light reflecting layer 46 made of aluminum is formed by vacuum deposition, and a resist layer is applied to form a predetermined island pattern using a photolithographic technique. A resist pattern 48 is formed. In FIG. 3C, by removing the resist pattern 48 with a solvent, an island-like pattern having a two-layer structure of the visible light absorbing layer 44 and the visible light reflecting layer 46 is formed on the back surface of the transparent glass substrate 42. . Next, as shown in FIG. 3D, the optical reflection / absorption filter 40 is configured by forming the protective coating 50 so as to cover the island pattern by applying and baking a glass paste. did.

  In addition, although black chromium was used as the visible light absorption layer 44, vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) Oxides and compounds are effective, and metal oxides and compound layers such as black chrome, black nickel, tin alloy, black rhodium, chrometol-treated zinc, and copper oxide (Cu) are particularly effective. Moreover, although aluminum was used as the visible light reflecting layer 46, gold (Au), silver (Ag), copper (Cu), tin (Sn), chromium (Cr), titanium (Ti), silicon (Si), molybdenum A metal film having excellent light reflectivity made of (Mo) or an alloy thereof is also effective.

  In the above, a method of forming a metal film by using a plating method and a vacuum deposition method and manufacturing an optical reflection / absorption filter by photolithography technology has been described. This optical reflection / absorption filter is applied by a coating method. This is also possible and will be described below with reference to FIG.

FIG. 4 shows a paste in which carbon or inorganic black fine particles or the like are dispersed in an organic resin as a visible light absorbing layer 54 on the back surface of a substrate 52 such as a heat-resistant acrylic resin, and titanium oxide as a visible light reflecting layer 56. Including at least one of (TiO ₂ ), barium oxide (BaO), zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), lead oxide (PbO ₂ ), magnesium oxide (Mg ₂ O), etc. It is formed by applying a paste in which white metal oxide particles or particles with excellent light scattering properties are dispersed in an organic resin to an island pattern using a die coating method or a screen printing method. . Thereafter, pressure was applied to the protective polyethylene terephthalate (PET) film 60 through the organic adhesive layer 58 to form an optical reflection / absorption filter 62.

  In addition, although the acrylic resin board | substrate was used as a board | substrate, other resin films, such as PET and polyethylene naphthalate (PEN), are also effective, and glass, such as tempered glass and high strain point glass, may be sufficient. In order to improve the heat resistance, the fine particles can be dispersed in glass as a base material of the paste, and the substrate and the protective film can be greatly improved by using glass. As described above, the optical reflection / absorption filter 40 and the optical reflection / absorption filter 62 are basically the same in terms of operating characteristics, although their manufacturing processes are different. In addition, the material which comprises the said island-like pattern does not need to be especially conductive, and may be electrically nonconductive.

  FIG. 1 is an enlarged cross-sectional view of one discharge cell in the PDP and the main part of the optical reflection / absorption filter along the line AA in FIG. 2, and the front panel 2 and the back panel 36 in FIG. The structure of the state which carried out the adhesion | attachment sealing | tightening was shown. The operation principle of the present invention will be described below with reference to FIG.

  Incident light indicated by an arrow 66 from the external light source 64 to the optical reflection / absorption filter 40 is absorbed by the visible light absorption layer 44 having an island pattern of the optical reflection / absorption filter 40. In addition, incident light indicated by an arrow 68 from the external light source 64 to the optical reflection / absorption filter 40 passes through the opening 1 of the optical reflection / absorption filter 40 and enters the discharge cell, and the phosphor layer 34. Is reflected by. The reflected light indicated by the arrow 72 which is a part of the reflected light is radiated to the outside. The reflected light indicated by the arrow 74 that is a part of the reflected light is reflected between the visible light reflecting layer 46 and the phosphor layer 34 and then emitted to the outside as visible light of the external light indicated by the arrow 76. Further, this reflection is repeated in the discharge cell, and is sequentially emitted outside as visible light. In the range shown in FIG. 1, the sum of visible light indicated by an arrow 72 and an arrow 76 coming out enters the eyes of the observer.

  Part of the visible light generated by the discharge in response to the signal in the discharge cell is directly emitted as visible light indicated by an arrow 78 passing through the opening 1 of the optical reflection / absorption filter. The visible light indicated by the arrow 80 is reflected between the visible light reflecting layer 46 and the phosphor layer 34 and then emitted to the outside as visible light indicated by the arrow 82. Similarly, visible light reflected between the visible light reflection layer 46 and the phosphor layer 34 is sequentially emitted. In the range shown in FIG. 1, the sum of the visible light indicated by the arrow 78 and the visible light indicated by the arrow 82 is received by the observer's eyes.

  Therefore, external light is greatly reduced by the visible light absorption layer 44 having an island pattern. On the other hand, the visible light generated by the discharge according to the signal is repeatedly reflected in the discharge cell, and is emitted outside without being absorbed by other constituent materials. As a result, the white display luminance and the bright place contrast can be greatly improved.

(Embodiment 2)
FIG. 5A shows a perspective view of the main part of the plasma display device in accordance with the second exemplary embodiment of the present invention, and shows a configuration in which the front panel and the rear panel are separated for easy understanding of the PDP. . FIG. 5B is an enlarged plan view of the island pattern as seen from the front side of the optical reflection / absorption filter according to Embodiment 2 of the present invention. FIG. 6 shows the configuration and manufacturing method of the optical reflection / absorption filter according to Embodiment 2 of the present invention. Hereinafter, the configuration and the manufacturing method will be described with reference to FIGS. Only differences from Embodiment 1 will be described. Also, common reference numerals are assigned to elements common to the first embodiment.

  The difference between the first embodiment and the second embodiment is that an optical reflection / absorption filter is formed on the front panel of the PDP. That is, as shown in FIG. 5, in the first embodiment, the optical reflection / absorption filter 40 is disposed at a predetermined distance d on the front side of the PDP 38, whereas in the second embodiment, the optical reflection / absorption filter 40 is transparent. An optical reflection / absorption filter 84 having an island pattern is formed on the front substrate 4. Hereinafter, the configuration and the manufacturing method will be described with reference to FIG.

  In FIG. 6, the optical reflection / absorption filter 84 is integrally formed on the front substrate 4 before the front panel 2 is configured. In FIG. 6A, the visible light reflecting layer 46 is formed on the transparent front substrate 4, and the visible light absorbing layer 44 is formed thereon. Next, in FIG. 6B, a resist layer is applied, and a resist pattern 48 is formed using a photolithographic technique so that a predetermined island pattern is formed. In FIG. 6C, by removing the resist pattern 48 with a solvent, an island-like pattern having a two-layer structure composed of the visible light absorbing layer 44 and the visible light reflecting layer 46 is formed on the surface of the transparent front substrate 4. The Next, as shown in FIG. 6D, the optical reflection / absorption filter 84 is formed by applying the glass paste and baking it so that the protective coating 50 covers the island pattern. did. Note that materials such as the visible light absorption layer 44, the visible light reflection layer 46, and the protective coating 50, film forming means, and the like are the same as those in the first embodiment, and a description thereof is omitted. Further, the operation principle is essentially the same as that of the first embodiment, and the description thereof is omitted.

  When the optical reflection / absorption filter is formed on the PDP panel as in the second embodiment, the interference between the visible light generated in the discharge cell and the visible light generated from the adjacent discharge cell is greatly reduced. be able to. That is, in the first embodiment, the optical reflection / absorption filter is disposed at a position away from the front panel of the PDP by a predetermined distance d, so that there is visible light passing through the distance d and adjacent to it. Although it interferes with visible light from the discharge cell, the configuration according to the second embodiment can greatly reduce this interference.

  As described above, in the first embodiment and the second embodiment, the example of the island-shaped optical reflection / absorption filter has been described. The planar shape of each non-opening portion of the island pattern may be a circle or other polygons in addition to a rectangle. It is also effective if the matrix-shaped non-opening portions constituting the island-shaped pattern are inclined in the vertical or horizontal direction with respect to the PDP screen.

  Further, in addition to the island pattern, the non-opening may be a mesh shape or a stripe shape. Note that the members of the non-opening portions constituting the mesh and the stripe do not necessarily need to be electrically continuously connected, and may be electrically discontinuous. Various shapes such as a quadrangle, a circle, and other polygons are effective as the planar shape of the non-opening. Further, the mesh and stripe directions are effective even if they are inclined with respect to the vertical and horizontal directions of the PDP screen.

  In the following, the relationship between the aperture ratio of the optical reflection / absorption filter having the island pattern of the present invention, the white display luminance, and the bright contrast is examined in detail by combining experiments and theoretical calculations. The result will be described. At that time, using the conventional optical filter as a comparative example, the optical reflection / absorption filter of the present invention alone and the optical reflection / absorption filter of the present invention are provided with antireflection, color correction, electromagnetic wave shielding, near-infrared prevention, etc. The white display brightness and the bright contrast were examined when a multifunctional optical filter having a function was added. Note that the case where a multi-function optical filter was added was examined on the assumption that the transmittance in the visible light region was b '.

(Comparative example)
FIG. 7 is a structural cross-sectional view of a plasma display device showing a model for calculating a conventional comparative example (hereinafter referred to as model 1). The calculation parameters are: external light intensity m, black display luminance M, white display luminance L, bright contrast C, optical filter transmittance b, panel luminance l (luminance when not passing through the optical filter), phosphor reflection The following formulas (1) to (3) show the ratio R and the panel luminance l ₀ at the time of background light emission (the PDP has a slight light emission called background light emission even during black display).

The black display luminance M is expressed by (Equation 1). The second term bl _{0 in} the middle of the derivation of (Equation 1) is a very small visible light component generated by the background light emission of the PDP and transmitted through the conventional optical filter, and is ignored with respect to the first term. Further, the white display luminance L is expressed by (Equation 2). The second term b ² Rm in the middle of the derivation of (Equation 2) represents a component in which external light has passed through the conventional optical filter twice, but it is negligible compared to the first term bl and can be ignored. it can. The bright place contrast C is represented by (Equation 3).

Example 1
FIG. 8 is a structural cross-sectional view of a plasma display device showing a calculation model for the island-shaped optical reflection / absorption filter of the present invention (hereinafter referred to as model 2). Each calculation parameter includes an aperture ratio a of an optical reflection / absorption filter having an island pattern, an external light intensity m, a black display luminance M ′, a white display luminance L ′, a bright contrast C ′, an optical reflection / absorption filter. reflectance r, the panel brightness l, phosphor reflectivity R, as a panel luminance l ₀ when the background light emission, the following equation (4) through (6).

  The black display luminance M ′ is expressed by (Equation 4). The final term in the middle of the derivation of (Equation 4) is a very small visible light component generated by the background light emission of the PDP and transmitted through the opening of the optical reflection / absorption filter according to the present invention. Ignored. The white display luminance L ′ is expressed by (Equation 5). The final term in the middle of the derivation of (Equation 5) represents a component in which external light has passed through the opening of the optical reflection / absorption filter according to the present invention twice, but is negligible because it is smaller than the first term. can do. Further, the bright place contrast C ′ is expressed by (Formula 6).

(Example 2)
FIG. 9 shows a calculation model in the case where a multifunctional optical filter having functions such as antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention is disposed on the front surface of the island-shaped optical reflection / absorption filter of the present invention. It is a structure sectional drawing of the plasma display apparatus which shows this. That is, it shows a calculation model to which a multifunctional optical filter having a visible light region having a transmittance b ′ is added (hereinafter referred to as model 3).

Each calculation parameter includes an aperture ratio a of an optical reflection / absorption filter having an island pattern, an external light intensity m, a black display luminance M ″, a white display luminance L ″, a bright contrast C ″, and an optical reflection. A multi-functional optical filter having functions such as reflectance r of the absorption filter, panel luminance l, phosphor reflectance R, panel luminance l ₀ during background light emission, and antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention. The transmittance b ′ is shown in the following (Equation 7) to (Equation 9).

  Since the explanation of each term in the process of deriving the above formula is the same as that in the first embodiment, it will be omitted and the final formula will be shown. The black display luminance M ″ is represented by (Equation 7), and the white display luminance L ″ is represented by (Equation 8). Further, the bright place contrast C ″ is expressed by (Equation 9).

In the above experiment, a luminance meter (Topcon BM-7) was installed at a distance of 50 cm in a direction perpendicular to the screen of a conventional plasma display device (with an optical filter) as a comparative example. The black display brightness was measured at a viewing angle of 2 degrees. The white display luminance was measured by displaying a white display screen (white display 4% window) with an area of 4% of the total screen area at the center of the black display screen. The black display luminance was measured by displaying a black display screen (black display 4% window) at an area of 4% of the total screen area at the center of the white display screen. Accordingly, when the panel luminance l of the conventional plasma display device (luminance when not passing through the optical filter) is 1000 cd / m ² , the white display luminance L of the product (with the optical filter) is 300 cd / m ² , The black display luminance M was 3.5 cd / m ² . On the other hand, a phosphor layer and a visible light reflection layer were formed on each glass substrate, and the reflectance was measured. As a result, the phosphor reflectance R was 0.7, and the reflectance r of the visible light reflection layer was 0.85. Hereinafter, it calculated using these values.

  First, the transmittance b and the external light intensity m of the optical filter were obtained from (Equation 1) and (Equation 2). The photopic contrast C was calculated by (Equation 3). In FIGS. 10 and 11 described later, the measured white display luminance L and the calculated value of the bright place contrast C are shown as comparative examples.

  The results calculated using the above calculation formula will be described with reference to FIGS.

  FIG. 10 shows calculation of model 1 and model 2, and the white display luminance L ′ and the bright place contrast C ′ with respect to the aperture ratio “a” of the optical reflection / absorption filter of the island-shaped pattern in the present invention are displayed in the white display of the comparative example. The luminance L and the bright place contrast C are respectively shown in comparison. From FIG. 10, it can be seen that the white display luminance L ′ in the present invention gradually increases with an increase in the aperture ratio a of the optical reflection / absorption filter, and the bright place contrast C ′ rapidly decreases. Thereby, the white display luminance L ′ in the present invention is equal to or higher than the white display luminance L of the optical filter of the comparative example when the aperture ratio a of the optical reflection / absorption filter is 15% or more. Further, it has been found that the bright place contrast C 'in the present invention is equal to or higher than the bright place contrast C of the comparative example when the aperture ratio a of the optical reflection / absorption filter is 29% or less. Therefore, the aperture ratio a of the optical reflection / absorption filter is set to 15% or more for improving the white display luminance, and the aperture ratio a of the optical reflection / absorption filter is set to 29% or less for improving the bright place contrast. I found it necessary to do. In particular, in the optical reflection / absorption filter of the present invention, the white display luminance and the bright place contrast can be improved at the same time when the aperture ratio a is 15 to 29% as compared with the optical filter of the comparative example.

  Next, calculation was performed using Model 1 and Model 3 in the case where the multifunctional optical filter having a transmittance b ′ in the visible light region was arranged in front of the optical reflection / absorption filter of the present invention. . In this case, the transmittance b 'of the multifunction optical filter was set to 80%. As a result, FIG. 11 shows the white display brightness L ″ and the bright spot contrast C ″ in comparison with the white display brightness L and the bright spot contrast C of the comparative example.

  From FIG. 11, it can be seen that the white display luminance L ″ in the present invention gradually increases with respect to the aperture ratio a of the optical reflection / absorption filter, and the bright place contrast C ″ rapidly decreases. Accordingly, the white display luminance L ″ in the present invention is equal to or higher than the white display luminance L of the optical filter of the comparative example when the aperture ratio of the optical reflection / absorption filter is 20% or more. Further, it has been found that the bright place contrast C ″ in the present invention is equal to or higher than the bright place contrast C of the comparative example when the aperture ratio of the optical reflection / absorption filter is 37% or less. Therefore, the aperture ratio of the optical reflection / absorption filter must be 20% or more to improve the white display luminance, and the aperture ratio of the optical reflection / absorption filter must be 37% or less to improve the bright place contrast. I found out that In particular, the optical reflection / absorption filter of the present invention has an aperture ratio of 20 to 37%, and the white reflection luminance and contrast of the bright place of the optical reflection / absorption filter of the present invention are higher than those of the optical filter of the comparative example. Both could be improved.

  Hereinafter, Table 1 shows the calculation results obtained by changing the transmittance b 'of the multifunction optical filter.

  From Table 1, it was found that when the aperture ratio of the optical reflection / absorption filter is 15 to 74%, it is effective for improving white display luminance and bright place contrast. Furthermore, it has been found that there is an optimum setting range in which the white display brightness and the bright place contrast are simultaneously improved in the aperture ratio range of the optical reflection / absorption filter.

That is, from Table 1, it was found that the range of the aperture ratio a of the optical reflection / absorption filter that can simultaneously improve the white display luminance and the bright place contrast varies depending on the transmittance b ′ of the multifunction optical filter. Further, when this range is obtained in a continuous form, it has been found that it can be expressed by (Equation 10) when 0.3 < b ′ < 1.

  FIG. 12 shows the optimum setting range of the aperture ratio a of the optical reflection / absorption filter obtained from the calculation result of (Equation 10). That is, the aperture ratio a of the optical reflection / absorption filter is within a range sandwiched between a curve 86 representing an upper limit of 0.3 / b ′ and a curve 88 representing a lower limit of 0.122 / (b′−0.179). By setting, white display luminance and bright place contrast can be improved at the same time, and a high-quality plasma display device can be realized.

  Therefore, in the case of the optical reflection / absorption filter alone described in the first and second embodiments of the present invention, the white display luminance and the bright place contrast are set by setting the aperture ratio a to 15 to 29%. Can be improved at the same time.

  Furthermore, a plasma display device in which a multifunctional optical filter is disposed in front of the optical reflection / absorption filter has functions such as antireflection, color correction, electromagnetic wave shielding, and near-infrared prevention, as well as transmission through the multifunctional optical filter. A plasma display device in which white display luminance and bright place contrast are improved at the same time by setting the aperture ratio a of the optical reflection / absorption filter in the optimum range represented by (Equation 10) according to the value of the rate b ′. realizable.

  In order to obtain a screen having essentially no defect in the PDP, at least one opening is required for one discharge cell, and the width or diameter of the opening is 50% or less of the discharge cell. It is preferable to do. If it is set to exceed 50%, one or more optical reflection / absorption filter openings may not correspond to one discharge cell, which adversely affects the definition of the screen.

  In addition, the effectiveness of the optical reflection / absorption filter using the electrically discontinuous island pattern is described above. Furthermore, non-openings such as the above-mentioned island pattern, mesh pattern, stripe pattern, etc. are electrically connected and installed, and a conductive material is used as a constituent material thereof, as a substrate for an optical reflection / absorption filter. Use of a material having a low transmittance in the near infrared region is effective as a combined optical reflection / absorption filter, such as prevention of electromagnetic waves and near infrared rays.

  The plasma display device according to the present invention is useful as various display devices because a high-quality screen in which white display luminance and bright place contrast are simultaneously improved can be obtained by a novel optical reflection / absorption filter.

Main part sectional drawing along the AA line of the plasma display apparatus shown in FIG. 2 in Embodiment 1 of this invention (A) The principal part perspective view which shows the structure of the plasma display apparatus in Embodiment 1 of this invention (B) The enlarged plan view of the island-like pattern seen from the front side of the optical reflection and absorption filter in (A) Sectional drawing which shows the structure and manufacturing process of the optical reflection and absorption filter in Embodiment 1 of this invention Sectional drawing which shows another structure and manufacturing process of the optical reflection and absorption filter in Embodiment 1 of this invention (A) Main part perspective view which shows the structure of the plasma display apparatus in Embodiment 2 of this invention (B) The enlarged plan view of the island-like pattern seen from the front side of the optical reflection and absorption filter in (A) Sectional drawing which shows the structure and manufacturing process of the optical reflection and absorption filter in Embodiment 2 of this invention Cross sectional view of a plasma display device showing a calculation model 1 in a comparative example Cross-sectional view of a plasma display device showing a calculation model 2 in the present invention Cross-sectional view of a plasma display device showing a calculation model 3 in the present invention Characteristic diagram showing calculation results of calculation model 1 in the comparative example and calculation model 2 in the present invention The characteristic diagram which shows the calculation result of the calculation model 1 in a comparative example, and the calculation model 3 in this invention The characteristic view which shows the aperture ratio range of the optimal optical reflection and absorption filter for improving simultaneously white display brightness | luminance and bright place contrast in this invention Cross-sectional view of the main part showing the configuration of a plasma display device according to the conventional invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Opening part 2,800 Front panel 3 Non-opening part 4 Front substrate 5 Circle 6 Discharge gap 8, 14 Scan electrode 10, 16 Sustain electrode 12 Bus electrode 18 Display electrode 20 Dielectric layer 22 Protective film 24, 804 Rear substrate 26, 806 Address electrode 28, 808 Base dielectric layer 30, 810 Partition 32 Recess 34, 812 Phosphor layer 36, 802 Rear panel 38, 816 Plasma display panel (PDP)
40, 62, 84 Optical reflection / absorption filter 42, 52, 818 Substrate 44, 54 Visible light absorption layer 46, 56 Visible light reflection layer 48 Resist pattern 50 Protective film 58 Organic adhesive layer 60 Polyethylene terephthalate (PET) film 64, 824 external light source 66,68,72,74,76,78,80,82,826,828,830,832,834,836 arrow 86,88 curve 814 discharge cell 820 antireflection film 822 optical filter

Claims (13)

A plurality of display electrodes, each comprising a scanning electrode and a sustaining electrode extending in the horizontal direction on the transparent front substrate and arranged in the vertical direction to form a discharge gap; a dielectric layer covering the display electrode; and the dielectric layer A front panel sequentially formed with a protective layer covering,
On the back substrate, at least a plurality of address electrodes extending in the vertical direction and juxtaposed in the horizontal direction, a base dielectric layer formed so as to cover the address electrodes, the base dielectric layer, and each of the address electrodes A cross-section of the address electrode and the display electrode is formed by bonding a partition panel disposed at least at both ends in the lateral direction and a back panel having a phosphor layer formed on the base dielectric layer in the partition through a discharge space. A discharge cell at a position where
A plasma display panel that displays information by discharging at least between the address electrode and the display electrode, between the scan electrode and the sustain electrode in a discharge cell,
The plasma display panel has a visible light absorbing layer having an opening portion and a non-opening portion on the front substrate, a visible light reflecting layer, and a protective coating, and optical reflection / absorption disposed on the surface of the front substrate. A plasma display device further comprising a filter. An optical reflection / absorption filter is integrally formed by forming a visible light reflecting layer, a visible light absorbing layer, and a transparent protective film having an opening and a non-opening on the surface of a transparent front substrate. The plasma display device according to claim 1. 3. The plasma display device according to claim 1, further comprising a multi-function optical filter on a front surface of the optical reflection / absorption filter. 4. The plasma display device according to claim 3, wherein the multi-function optical filter has at least one function of antireflection, color correction, electromagnetic wave shielding, and near infrared ray prevention. Visible light absorption layer is composed of vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu) oxide or compound, carbon, black fine particles 5. The plasma display device according to claim 1, wherein the plasma display device includes a material selected from an organic material dispersed in glass and a glass dispersed in black fine particles. The visible light reflecting layer is made of gold (Au), silver (Ag), copper (Cu), tin (Sn), chromium (Cr), aluminum (Al), titanium (Ti), silicon (Si), molybdenum (Mo ) And metal materials made of alloys thereof, titanium oxide (TiO ₂ ), barium oxide (BaO), zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), lead oxide (PbO ₂ ), magnesium oxide (Mg ₂₎ A material selected from organic resin or glass in which white metal oxide particles containing at least one or more of O) and particles having excellent light scattering properties are dispersed is included. 5. The plasma display device according to any one of 4. 3. The plasma display device according to claim 1, wherein an aperture ratio of the optical reflection / absorption filter is in a range of 15% to 29%. The transmittance b ′ of the multifunction optical filter is 30% or more, and the aperture ratio of the optical reflection / absorption filter is from 0.122 × 100 / (b′−0.179) to 0.3 × 100. The plasma display device according to claim 3 or 4, wherein the plasma display device is in a range of / b '%. The plasma display device according to claim 1, wherein a planar shape of the non-opening portion of the optical reflection / absorption filter is an island shape. The plasma display device according to any one of claims 1 to 4, wherein a planar shape of the non-opening portion of the optical reflection / absorption filter is a mesh shape. 5. The plasma display device according to claim 1, wherein a planar shape of the non-opening portion of the optical reflection / absorption filter is a stripe shape. 6. 12. The plasma display device according to claim 10, wherein a width or a diameter of the opening of the optical reflection / absorption filter is 50% or less of a discharge cell. 13. The plasma display device according to claim 1, wherein the optical reflection / absorption filter is disposed at a predetermined distance substantially parallel to the surface of the front substrate.

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