JP2009037146A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel displaying an image with high contrast even in a bright environment. <P>SOLUTION: A plasma display device is equipped with: a plasma display panel that has a front plate including reflective elements reflecting visible light and a back plate disposed opposing to the front plate and that emits display light by allowing a phosphor on the back plate to emit light by discharge in a discharge space between the front plate and the back plate; and a front filter disposed to face the front plate and having a reflective element that relatively strongly reflects light in a part of the wavelength range of the visible light. The plasma display device is configured in such a manner that: the front plate includes a dielectric layer being a transmissive element transmitting the display light; the transmissive element is in a first chromatic color relatively strongly absorbing light in a part of the wavelength range of the visible light; and at least one of the reflective elements is in a second chromatic color relatively strongly reflecting light in a part of the wavelength range of the visible light, the second chromatic color being in a complementary relation with respect to the first chromatic color. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plasma display device.

  In recent years, expectations for flat display devices that replace CRT display devices have increased, and liquid crystal display devices, plasma display devices, and the like with reduced depth have become widespread. In particular, a plasma display device is often used for a large screen flat display device.

  The plasma display device mainly includes a plasma display panel and a front filter. A plasma display panel is a display device that generates visible light by exciting phosphors with ultraviolet rays generated by gas discharge, and forms an image by controlling light emission for each discharge cell that partitions a discharge space.

  For example, in a matrix display type plasma display panel, a plurality of electrodes (display electrodes and address electrodes) are arranged in a lattice pattern, and an image is formed by selectively emitting light from discharge cells that intersect each electrode.

  The light emission principle of each discharge cell is as follows. That is, when a pulsed AC voltage of several tens to several hundreds kHz is applied between the opposing electrodes of the discharge cell to be lit, wall charges are accumulated and display discharge occurs, and the components of the discharge gas enclosed in the discharge cell Ultraviolet rays are emitted from Xe. The emitted ultraviolet light excites red, blue, and green phosphors formed in the discharge cell to generate visible light of each color. Here, one set of discharge cells of three colors is used as one pixel, and the full color display of 16.7 million colors is possible by controlling the emission intensity of each color in, for example, 256 levels.

  As described above, the light emission of the plasma display panel uses the discharge phenomenon, so the response speed is fast, and since the phosphor is used similarly to the CRT, the color reproducibility is good, so it is suitable for displaying moving images such as TV images. ing. In addition, because of its structure, the plasma display panel can realize a large screen relatively easily, is self-luminous, has no viewing angle dependency, and has an excellent image display capability with high contrast in a dark room. As a large-screen TV receiver, demand is rapidly expanding.

  However, since a high-reflectance phosphor is formed in each discharge cell of the plasma display panel, high contrast can be realized in a dark environment, but reflection of outside light is large in a bright environment and the contrast is lowered. There is a problem that it is easy. Therefore, there is a demand for a plasma display panel that can maintain high contrast even in a bright environment.

  In response to such a request, for example, a stripe-shaped light absorption layer is arranged on the front panel (front plate) so as to overlap with the partition walls defining the discharge space, and an optical filter arranged on the observer side of the front panel. A technique of providing a light absorption layer inside is known. Thereby, the light that reaches the plasma display panel and is reflected internally can be attenuated.

  In addition, a technique for improving the contrast by controlling the transmittance in visible light of a front panel of a plasma display panel or a filter installed on the surface of the front panel has been proposed (Patent Document 1). In patent document 1, the average transmittance | permeability with respect to the visible light of the filter installed in the display plate side of the front plate of a plasma display panel or a front plate is 30-80%, and the transmittance | permeability has a dip part in the range of 450-650 nm. It is supposed that the contrast is improved by taking the configuration.

  In addition, a technique (Patent Document 2) is proposed that improves the contrast of the plasma display panel by coloring the dielectric layers of the front substrate of the plasma display panel and the dielectric layer of the back plate in a complementary color relationship.

  In addition, a technology for reducing the reflection luminance during driving by forming a groove in the partition wall of the back plate of the plasma display panel and forming an antireflection layer in the groove to improve the contrast of the plasma display panel (Patent Document 3) A technique (Patent Document 4) has been proposed in which the dielectric layer of the front plate and the partition walls of the back plate are colored in a complementary color relationship to reduce external light reflection luminance and improve contrast.

In addition, a technique (Patent Document 5) in which a complementary color filter having a light transmission characteristic that has a complementary color relationship with respect to the spectral characteristic of reflected light of a plasma display panel is proposed.
JP 2000-106092 A JP 2005-63961 A JP 2006-114482 A JP 2005-063943 A JP 2004-109545 A

  However, the conventional plasma display device in which the light absorption layer is provided inside the front panel and the optical filter has a problem that the panel luminance is lowered because the image light to be observed is also absorbed by the light absorption layer.

  Further, in the configuration of Patent Document 1, an example is shown in which the hue of the front plate and the filter of the plasma display panel are complementary to each other. However, in Patent Document 1, the content is defined for the transmission characteristics, and the influence on the reflection element and the reflection characteristics of the plasma display panel is not considered.

  In the configuration of Patent Document 2, an example is shown in which the hues of the dielectric layer of the front plate and the dielectric layer of the back plate are complementary to each other. Patent Document 2 discloses that external light reflection is reduced by a light absorption effect of a complementary color-related dielectric layer. However, Patent Document 2 does not consider the influence of the transmissive element and the reflective element in the entire plasma display device including the front filter. Furthermore, in patent document 2, the influence of the reflective element of the front plate is not considered.

  Moreover, in the structure of patent document 3, the example which forms a groove | channel in the partition of a backplate and forms an antireflection layer in the part is shown. However, Patent Document 3 is a manufacturing method and configuration for reducing reflection, and does not consider the influence of the transmissive element of the plasma display device.

  Further, in the configuration of Patent Document 4, an example is shown in which the hues of the dielectric layer of the front plate of the plasma display panel and the color of the partition walls of the back plate are complementary to each other. However, Patent Document 4 does not consider the influence on the transmissive element and the reflective element in the entire plasma display device including the front filter. Furthermore, in patent document 4, the influence of the reflective element of the front plate is not considered.

  Further, in the configuration of Patent Document 5, an example is shown in which a complementary color filter having a light transmission characteristic that has a complementary color relationship with respect to the spectral characteristic of the reflected light of the plasma display panel is used. However, Patent Document 5 does not disclose means for implementing a complementary color filter.

  Accordingly, an object of the present invention is to provide a plasma display device capable of displaying an image with high contrast even in a bright environment.

  The plasma display device of the present invention includes a front plate including a reflective element that reflects visible light, and a back plate disposed opposite to the front plate, and discharges to a discharge space between the front plate and the back plate. A plasma display panel that emits display light by emitting phosphors on the back plate, and a front filter that is disposed opposite to the front plate and includes a reflective element that reflects visible light, and the front plate includes: A dielectric layer that is a transmissive element that transmits display light, wherein the transmissive element is a first chromatic color that absorbs light in a certain wavelength region in visible light relatively strongly, and includes at least one of the reflective elements One is a second chromatic color that relatively strongly reflects light in a certain wavelength region in visible light, and is a second chromatic color that is complementary to the first chromatic color. is there.

  Thus, according to the present invention, it is possible to provide a plasma display device capable of displaying an image with high contrast even in a bright environment.

  In the following embodiments, the transmissive element has a first chromatic color that absorbs light in a part of the wavelength range in the visible light relatively strongly, and the light in the part of the wavelength range in the visible light is relatively Plasma display that can display images with high contrast even in bright environments by making the reflective element a second chromatic color that is strongly reflected by the second chromatic color that has a complementary relationship with the first chromatic color The apparatus will be described.

(Embodiment)
FIG. 1 is a schematic cross-sectional view showing a configuration of a plasma display device 1 in the present embodiment. The plasma display device 1 includes a plasma display panel 2 and a front filter 3. The front filter 3 is installed at a distance from the plasma display panel 2. The plasma display panel 2 includes a front panel (front plate) 10 and a back panel (back plate) 20 that is spaced from and opposed to the front panel 10. A discharge gas such as Xe, He, Ne or the like is sealed in a discharge space that is a gap between the front panel 10 and the back panel 20. FIG. 2 is a perspective view of the configuration of the plasma display panel 2 in the present embodiment.

<Plasma display panel 2>
<Rear panel 20>
The back panel 20 includes a phosphor layer 24, a partition wall 25, a dielectric layer 22, an address electrode 23, and a back substrate 21 in order from the viewer side. More specifically, for example, an address electrode 23 and a dielectric layer 22 are formed so as to cover the address electrode 23 on the viewer-side surface of the rear substrate 21 made of a glass substrate or the like. A partition wall 25 is formed so as to protrude in the direction. On the surfaces of the barrier ribs 25 and the dielectric layer 22, the phosphor is applied leaving only the tops (non-light emitting portions) of the barrier ribs 25, thereby forming the phosphor layer 24.

<Front panel 10>
The front panel 10 includes a front substrate 16 made of, for example, a glass substrate, a counter electrode 17, a dielectric layer 12 and a light absorption layer 13, and a protective layer 11. Here, the light absorption layer 13 corresponds to a black stripe portion of the front panel. More specifically, a counter electrode 17 having a two-layer structure of a transparent electrode 15 having a high transmittance and a bus electrode 14 having a low resistance value and the light absorption layer 13 are formed on the surface of the front substrate 16 on the back panel side. . The dielectric layer 12 is made of a material colored in blue and covers the transparent electrode 15, the bus electrode 14, and the light absorption layer 13. Further, a protective layer 11 is formed on the surface of the dielectric layer 12 on the back panel side.

  The counter electrode 17 is configured to have a short electrode width in the horizontal direction in FIG. 1, and a current corresponding to one discharge cell is energized. Further, since the conduction path is configured to be long in the depth direction of FIG. 1 and the currents of the respective discharge cells are added together, it is necessary to reduce the resistance value. Therefore, the counter electrode 17 is not transparent and has a low resistance value, for example, a metal such as chromium, copper, or silver, to the transparent electrode 15 using a thin film transparent material such as an indium tin oxide (ITO) film or a tin oxide film. A two-layer structure is provided in which a bus electrode 14 using a material is provided.

  In the plasma display panel 2 configured as described above, when a pulsed AC voltage is applied to the pair of counter electrodes 17 of the discharge cell, display discharge occurs and ultraviolet rays are generated. The generated ultraviolet light excites the phosphor of the phosphor layer 24 formed on the rear panel to generate visible light (display light) and emits it as image light to the viewer side.

<Front filter 3>
The front filter 3 is disposed to face the front panel 10 and is spaced from the plasma display panel 2. In the front filter 3, for example, functional films are bonded to both surfaces of a substrate 33 made of glass or the like. Specifically, an electromagnetic wave interference countermeasure film 31 is bonded to the substrate 33 via the adhesive layer 32 on the plasma display panel 2 side, and an antireflection film 35 is bonded to the substrate 33 via the adhesive layer 34 on the observation side. It is glued to. The front filter 3 includes a material having a near infrared blocking function in the adhesive layer 32. FIG. 3 is a partial cross-sectional view showing the configuration of the antireflection film 35 in the present embodiment. The antireflection film 35 includes a resin substrate 41 and an antireflection material 42. FIG. 4A is a partial cross-sectional view of the configuration of the electromagnetic wave interference countermeasure film 31 in the embodiment. FIG.4 (b) is the front view seen from the device side of the structure of the electromagnetic wave interference countermeasure film 31 in embodiment. Here, the electromagnetic wave interference countermeasure film 31 includes a resin substrate 43 and a transparent resin 45 that are transmissive elements, and a metal mesh 44 that is a reflective element.

  In the present embodiment, the dielectric layer 12 that is a transmissive element is set to a first chromatic color, and the metal mesh 44 that is a reflective element is set to a second chromatic color that is complementary to the first chromatic color. In this case, the surface of the metal mesh 44 is colored so as to be yellow.

  In the plasma display panel 2, when the luminous efficiencies of the three primary colors red, green, and blue are viewed, the blue luminous efficiency is relatively low. For this reason, desired white balance is obtained by suppressing green and red light emission from the original ability. In the present embodiment, the dielectric layer 12 is colored blue so that the transmission element of the image light is blue and the absorption on the long wavelength side is increased. Regarding the image light, since there is a margin on the long wavelength side, the white luminance does not decrease due to blue coloring.

  On the other hand, the long wavelength component of external light is absorbed and the amount of reflected light can be reduced. Although the reflected light is colored blue, the reflection characteristics of the yellow metal mesh 44 are relatively large on the longer wavelength side. As a result, the reflected light is suppressed from being colored and reflected to the outside light while being achromatic (gray). Can be reduced. Further, the transmissive element has a planar shape and is disposed on the outer side (front filter side) of the partition wall 25 and the dielectric layer 22 which are the reflective elements of the back panel 20, thereby effectively reducing external light reflection. can do. Further, by reflecting the metal mesh 44, which is the reflective element closest to the outside (observer side) of the plasma display device, to the second chromatic color that is complementary to the first chromatic color, the external light reflection is effectively prevented. Can be reduced. Further, by making the reflective element outside the dielectric layer 12 (observer side) a second chromatic color that is complementary to the first chromatic color, it is possible to effectively reduce external light reflection. .

  Therefore, the dielectric layer 12 that is the transmissive element is set to the first chromatic color (blue), and the metal mesh 44 that is the reflective element is set to the second chromatic color (yellow) that is complementary to the first chromatic color. Therefore, it is possible to provide a plasma display device that reduces external light reflection while maintaining high luminance and has high contrast even in a bright environment.

(Modification)
The above embodiment of the present invention has been described with an example in which the metal mesh 44 that is the reflective element is set to the second chromatic color, but other reflective elements may be set to the second chromatic color. Other reflective elements are included in the front panel 10.

<Front panel 10>
The front panel 10 is (1) a light absorbing layer disposed on the back panel 20 side and disposed corresponding to a non-light emitting portion (the top of the partition wall 25) of the back panel 20, or (2) on the back panel 20 side. The bus electrode 14 to be arranged is included as a reflective element. The light absorbing layer 13 or the bus electrode 14 may have a second chromatic color that is complementary to the first chromatic color.

  Here, similarly to the above-described embodiment, the dielectric layer 12 as the transmissive element is set to the first chromatic color.

  By making the transmissive element a first chromatic color (blue) and making the light absorbing layer 13 or the bus electrode 14 that is a reflective element a second chromatic color (yellow) that is complementary to the first chromatic color, It is possible to provide a plasma display device that reduces external light reflection while maintaining high luminance and has high contrast even in a bright environment. In addition, the reflection element outside the dielectric layer 12 (on the front filter 3 side) is changed to the second chromatic color having a complementary color relationship with the first chromatic color, thereby effectively reducing external light reflection. it can.

  In the above-described embodiment and modification, the front filter 3 has been described with respect to the example in which the front filter 3 is installed on the front surface of the plasma display panel 2 with a space therebetween. It may be. In this case, when a transparent resin substrate is used instead of the glass substrate of the front filter 3, the productivity is further improved.

  Moreover, although the front filter 3 showed about the example in which the material provided with the near-infrared shielding function was contained in the adhesion layer 32, you may include it in the adhesion layer 34 of the antireflection film 35.

  In the front filter 3, an example in which a material having a near-infrared blocking function is included in the adhesive layer 32 has been described. In addition, between the antireflection film 35 and the adhesive layer 34, and the electromagnetic wave interference countermeasure film 31 and the adhesive You may make it the structure which coat | covers the material provided with the near-infrared shielding function between the layers 32. FIG.

  In the embodiment and the modification described above, the case where one element is made the first chromatic color as the transmissive element has been described, but two or more transmissive elements may be combined and colored.

  Furthermore, although the planar dielectric layer 12 is blue in the above embodiments and modifications, this compensates for the relative shortage of blue light emission in the current plasma display panel. When other colors such as red are relatively insufficient due to the development of the body, it is desirable to color the dielectric layer 12 to the insufficient red. In that case, the reflective elements such as the barrier ribs have a chromatic color complementary to the coloring of the dielectric layer 12.

  The present invention is suitable for TV receivers, information terminal displays, and the like that require display of bright images with high contrast.

Schematic sectional view showing a configuration of a plasma display device in an embodiment The perspective view which shows the structure of the plasma display panel in embodiment The fragmentary sectional view which shows the structure of the anti-reflective film in embodiment 4A is a partial cross-sectional view of the configuration of the electromagnetic interference prevention film in the embodiment, and FIG. 4B is a front view of the configuration of the electromagnetic interference prevention film in the embodiment as viewed from the device side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plasma display apparatus 2 Plasma display panel 3 Front filter 10 Front panel 11 Protective layer 12 Dielectric layer 13 Light absorption layer 14 Bus electrode 15 Transparent electrode 16 Front substrate 20 Rear panel 21 Rear substrate 22 Dielectric layer 23 Address electrode 24 Phosphor Layer 25 Partition 31 Electromagnetic interference prevention films 32 and 34 Adhesive layer 33 Substrate 35 Antireflection film 41 and 43 Resin substrate 42 Antireflection material 44 Metal mesh 45 Resin

Claims (7)

A front plate including a reflective element that reflects visible light; and a back plate disposed opposite to the front plate; and the phosphor of the back plate is discharged by discharge into a discharge space between the front plate and the back plate. A plasma display panel that emits light and emits display light;
A front filter including a reflective element disposed opposite to the front plate and reflecting visible light;
Comprising
The front plate includes a dielectric layer that is a transmissive element that transmits display light,
The transmission element is a first chromatic color that absorbs light in a part of the wavelength range in visible light relatively strongly, and at least one of the reflection elements is light in a part of the wavelength range in visible light. Is a second chromatic color that relatively strongly reflects the second chromatic color that is complementary to the first chromatic color,
A plasma display device.   The plasma display apparatus of claim 1, wherein the reflective element is outside the dielectric layer.   The plasma display device according to claim 1, wherein the transmissive element has a planar shape and is disposed outside the reflective element of the back plate.   The plasma display apparatus according to any one of claims 1 to 3, wherein the first chromatic color is blue.   The plasma display device according to any one of claims 1 to 4, wherein the front filter includes an electromagnetic interference prevention film having a reflective element. The electromagnetic interference prevention film includes a metal mesh that is a reflective element,
The metal mesh is a second chromatic color that is complementary to the first chromatic color.
The plasma display device according to claim 5, wherein: The front plate reflects (1) a light absorption layer arranged on the back plate side and corresponding to a non-light emitting portion of the back plate, or (2) reflecting a bus electrode arranged on the back plate side. Including as an element,
The light absorbing layer or the bus electrode is a second chromatic color that is complementary to the first chromatic color,
The plasma display device according to claim 1, wherein the plasma display device is a plasma display device.

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