JP2009129834A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel capable of attaining high luminance as well as high contrast. <P>SOLUTION: The plasma display panel (PDP) 100 has a sub wavelength structure layer 125 selectively reflecting light of a light-emitting wavelength range of a phosphor layer 122 between a partition 121 and the phosphor layer 122 and between a cell bottom face facing a discharge cell 130 of a back plate 120 and the phosphor layer 122. High luminance can be achieved so that an emitted luminous flux from the phosphor layer 122 is emitted at a front surface plate 110 side by efficiently reflecting the emitted luminous flux by the sub wavelength structure layer 125, and high contrast can be achieved also so that reflection of light components excluding a light-emitting wavelength of the phosphor layer 122 among spectrum components of outdoor daylight is restrained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plasma display panel (PDP), and more particularly to a plasma display panel having high brightness and high contrast.

  2. Description of the Related Art Conventionally, a self-luminous display has been widely used as a display because it has no viewing angle dependency and a natural image can be obtained. In particular, the plasma display panel is thin and optimal for constituting a large screen.

  In general, a self-luminous display device such as a plasma display panel has a low contrast as compared with a liquid crystal display panel. In particular, such a self-luminous display device has low contrast when the environment in which it is installed is bright.

  This is because external light is incident on the display unit and reflected. For this reason, in a conventional self-luminous display device, a filter having a lower transmittance is usually arranged on the viewer side than the phosphor layer. In this case, external light passes through the filter and reaches the phosphor layer, where it is reflected, and is again transmitted through the filter and observed. On the other hand, the luminous flux from the phosphor layer is observed once passing through the filter. Therefore, the decrease in the amount of light at the filter is more influenced by the outside light, and the contrast in a bright place is improved. However, in this configuration, the luminous flux is inevitably absorbed and attenuated by the filter, so that the problem that the luminance is lowered remains. Therefore, as a technique for improving both contrast and luminance, for example, those described in Patent Document 1 and Patent Document 2 are known.

  Patent Document 1 discloses a method of improving the contrast by providing a film or layer that efficiently reflects the emission color emitted from the phosphor layer between the phosphor layer and the partition wall or the cell bottom surface. In particular, the plasma display device described in Patent Document 1 uses a color pigment that matches the light emission color of each phosphor layer or an interference film having optical filter characteristics as a film or layer configuration, so that luminance is improved. The color purity and contrast are improved while increasing.

Patent Document 2 discloses a plasma display panel in which a black pigment or a color pigment is mixed with a light reflection layer under a phosphor layer, or a dielectric layer and a partition.
JP-A-8-138559 JP 11-162357 A Photophysics of Structural Color in the MorphoButterflies Forma, 17, 103-121, 2002

  However, the conventional plasma display panels described in Patent Document 1 and Patent Document 2 have the following problems.

  That is, in the configuration using the black pigment, the contrast is improved, but the luminance is lowered. The reason is that the color pigment can reflect the light of the required wavelength component emitted from the phosphor with little loss, while the black pigment has a uniform wavelength of light of the required wavelength component and unnecessary wavelength component. Because it absorbs. In paragraph [0035] of Patent Document 2, there is a description that light utilization efficiency of 64% is obtained in the case of a black pigment, and light utilization efficiency of 82% is obtained in the case of a color pigment.

  Moreover, in the structure using a color pigment, although the brightness | luminance fall is improved rather than the case where a black pigment is used, it was not enough. The reason is that color pigment color development depends on the material properties of the color pigment, so it is impossible to arbitrarily match the peak wavelength of the spectral reflectance of the color pigment to the emission wavelength of the phosphor. This is because it is difficult to realize the optimum reflection characteristic without the wavelength of. In addition, in the configuration using the interference film, a film material that can withstand a high-temperature process necessary for the manufacturing process of the plasma display panel is required, so that it is difficult to realize this.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a plasma display panel that can achieve high brightness as well as high contrast.

  The plasma display panel of the present invention is divided by a front panel and a rear panel that are spaced apart from each other, a partition that partitions a discharge space formed between the front panel and the rear panel, and the partition. A plasma display panel comprising: a phosphor layer formed in the discharge cell; and electrodes arranged on the front plate and the back plate, respectively, for generating a discharge in the discharge cell, A sub that selectively reflects light in the emission wavelength region of the phosphor layer between the phosphor layer and / or between the cell bottom surface of the back plate facing the discharge cell and the phosphor layer. A configuration including a wavelength structure layer is adopted.

  According to the present invention, it is possible to achieve high brightness as well as high contrast.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of a plasma display panel (PDP) according to Embodiment 1 of the present invention, which is a discharge cell (hereinafter also simply referred to as a “cell”) that is a light emitting region spatially separated for each emission color. ) Is shown in cross section.

  Referring to FIG. 1, a plasma display panel (PDP) 100 includes a front plate 110 and a back plate 120 that are spaced apart from each other. FIG. 1 shows a characteristic configuration of the present embodiment, and a part of the other portions is omitted.

  In the space between the front plate 110 and the back plate 120, a discharge space for generating plasma discharge is formed. The discharge space is filled with a discharge gas in which helium (He), neon (Ne), xenon (Xe), argon (Ar), or the like is mixed. The discharge space is partitioned into a plurality of sections by the partition 121, and a plurality of discharge cells 130 serving as unit light emitting regions are formed. On the inner walls of three adjacent discharge cells 130, red (R), green (G), and blue (B) phosphor layers are applied in different colors for each discharge cell.

  In order to realize the function as the PDP 100, each component such as an electrode, a dielectric layer, and a protective film is formed on the front plate 110 at appropriate positions. For example, the front plate 110 is a striped display in which a scan electrode made of a transparent electrode 111 and a metal electrode 112 and a sustain electrode made of a transparent electrode 113 and a metal electrode 114 are paired on a front substrate 110a made of glass or the like. A plurality of electrodes are formed, and a dielectric layer 115 made of, for example, glass is formed so as to cover the display electrodes. Furthermore, a protective layer 116 made of, for example, magnesium oxide (MgO) is formed on the dielectric layer 115. In addition, the light shielding unit 117 absorbs external light and suppresses a decrease in contrast. Similarly, the antireflection film 118 suppresses reflection of external light and suppresses a decrease in contrast. Note that these configurations are examples, and various modifications can be applied.

  Further, for example, the back plate 120 includes a partition wall 121 that partitions a discharge space formed between the front plate 110 and the back plate 120 and forms a discharge cell 130 on a back substrate 120 a made of glass or the like, and a partition wall 121. The phosphor layer 122 formed in the discharge cell 130 partitioned by the above and the data electrode 124 covered with the insulator layer 123 are provided.

  Further, the back plate 120 includes a portion (cell bottom surface portion) facing the discharge cell 130 between the partition wall 121 and the phosphor layer 122 constituting the discharge cell 130 and the insulator layer 123 covering the back plate 120. A sub-wavelength structure layer 125 that selectively reflects light in the emission wavelength region of the phosphor layer 122 is provided between the phosphor layer 122 and the phosphor layer 122. In the back plate 120, a data electrode 124 covered with an insulating layer 123 and a plurality of stripe-shaped partition walls 121 are formed between the front plate 110 and the back plate 120.

  As described above, the plasma display panel (PDP) 100 according to the present exemplary embodiment is provided between the partition wall 121 and the phosphor layer 122 and between the insulator layer 123 and the phosphor layer 122 at the cell bottom portion. The phosphor layer 122 is characterized by having a sub-wavelength structure layer 125 that selectively reflects light in the emission wavelength region.

  Here, the sub-wavelength structure layer 125 will be described in detail with reference to FIG. FIG. 2 is an enlarged cross-sectional view of the subwavelength structure layer 125.

  The sub-wavelength structure layer 125 is a structural color expression part having a fine three-dimensional structure, and has a function of selectively reflecting light in the emission wavelength region of the phosphor layer 122 in terms of structure. For example, Non-Patent Document 1 shows the analysis result of the structural color of Morpho Butterflies. The structural color is a coloring phenomenon caused by light interference caused by a fine structure having a wavelength of light or less. That is, the structural color is a coloring phenomenon that does not depend on a dye or light emission, and therefore does not decolorize by ultraviolet rays or the like, unlike the coloring by a dye or pigment. In the case of structural colors, it is also possible to reflect visible light almost completely by optimizing the laminated structure.

  As shown in FIG. 2, the sub-wavelength structure layer 125 is configured by combining a plurality of columnar bodies 150 and a plurality of parallel flat plates 151. The columnar body 150 protrudes and extends in a substantially vertical direction from the insulator layer 123 of the back plate 120 to the phosphor layer 122 side. In addition, the parallel plate 151 group is arranged in parallel in each columnar body 150 at a constant interval in a direction substantially perpendicular to the extending direction of each columnar body 150. The sub-wavelength structure layer 125 is formed by finely processing an inorganic material using, for example, a focused ion beam apparatus.

In the sub-wavelength structure layer 125 having such a configuration, the refractive index of the parallel plate 151 is n, the thickness of the parallel plate 151 is a, the thickness of the space between the parallel plates 151 (the interval between the parallel plates 151) is b, When the wavelength of the fluorescence emission color emitted from the phosphor layer 122 is λ, the light in the emission wavelength region of the phosphor layer 122 can be selectively reflected by satisfying the following equation (1).
λ / 2 = a × n + b (1)

  That is, by forming the sub-wavelength structure layer 125 so that the refractive index n, the thickness a, and the interval b of the parallel plate 151 satisfy the above formula (1) according to the emission wavelength region of the phosphor layer 122, red , Blue, or green light in each emission wavelength range can be selectively reflected. For example, Morpho butterfly wings have a vivid blue color rich in metallic luster, which is a structural color due to a lattice-like structure carved on the scale surface. The lattice-like structures are arranged at intervals of 200 nm corresponding to exactly half the wavelength of blue light, and only blue light is reflected by interference. In the PDP 100, when the blue wavelength light is selectively reflected from the emission wavelength region of the phosphor layer 122, the refractive index n of the parallel plate 151 is set so that the blue wavelength λ satisfies the above formula (1). The subwavelength structure layer 125 may be configured by determining the thickness a and the interval b. Similarly, when the red or green wavelength light is selectively reflected from the emission wavelength region of the phosphor layer 122, the sub-wavelength is set so that the red or green wavelength λ satisfies the above formula (1). The structural layer 125 may be configured.

  Therefore, by forming such a sub-wavelength structure layer 125, it is possible to narrow the fluorescent light emission wavelength region that emits light in a wide wavelength region and increase the color purity. In addition, by using the sub-wavelength structure layer 125 in which the refractive index, thickness, and interval of the parallel plate 151 that satisfies the above formula (1) are appropriately dispersed, in each of the emission wavelength ranges of red, blue, and green, Selective reflection in a wider wavelength range can be realized. With such an effect, effective light emission efficiency can be improved, and luminance can be improved.

  Further, in such a sub-wavelength structure layer 125, when external light is incident on the sub-wavelength structure layer 125 that selectively reflects light in the red wavelength range in particular, the external light component other than red is converted into the sub-wavelength structure layer 125. The light passes through 125, enters the insulator layer 123, and is absorbed. Further, when external light is incident on the sub-wavelength structure layer 125 that selectively reflects light in the blue wavelength region, external light components other than blue light are transmitted through the sub-wavelength structure layer 125 and are incident on the insulator layer 123. Then absorbed. Further, when external light is incident on the sub-wavelength structure layer 125 that selectively reflects light in the green wavelength range, external light components other than green light are transmitted through the sub-wavelength structure layer 125 and are incident on the insulator layer 123. Then absorbed. By such an action, reflection of external light is reduced and contrast can be improved.

  Note that, as described above, the sub-wavelength structure layer 125 differs from the coloring by pigments and pigments, and by optimizing the sub-wavelength structure, light of a specific color is almost completely emitted from the emission wavelength region of the phosphor layer 122. It can also be reflected.

  Next, the operation of the PDP 100 having the above configuration will be described.

  In the PDP 100 configured as described above, when a voltage is applied between the electrodes, a discharge is generated in the discharge cell 130, and ultraviolet light is generated from, for example, helium (He) atoms in the mixed gas. Then, the phosphor layer 122 is excited by the generated ultraviolet rays to generate visible light, and a display operation is performed. In other words, a display operation is performed in a minute region composed of a plurality of discharge cells that are intersections of the display electrode and the data electrode, and an image is displayed. At this time, since the luminous flux from the phosphor layer 122 is efficiently reflected by the sub-wavelength structure layer 125 and emitted to the front plate 110 side, the luminance is increased, and at the same time, fluorescence is included in the spectral components of the external light. Since reflection of light components other than the emission wavelength region of the body layer 122 is suppressed by the sub-wavelength structure layer 125, high contrast can be achieved. The light shielding unit 117 absorbs external light and suppresses a decrease in contrast. Further, the antireflection film 118 suppresses reflection of external light and suppresses a decrease in contrast.

  As described above, according to the present embodiment, the phosphor layer 122 is interposed between the partition wall 121 and the phosphor layer 122 and between the cell bottom surface of the back plate 120 facing the discharge cell 130 and the phosphor layer 122. Since the sub-wavelength structure layer 125 that selectively reflects light in the emission wavelength region is provided, the emitted light flux generated in the phosphor layer 122 is selectively reflected by the sub-wavelength structure layer 125 and increases in contrast with high contrast. Brightness can also be achieved.

  In other words, according to the present embodiment, the luminous flux from the phosphor layer 122 is efficiently reflected by the sub-wavelength structure layer 125 and emitted to the front plate 110 side, so that high luminance can be realized. At the same time, reflection of light components other than the emission wavelength of the phosphor layer 122 among the spectral components of the external light is suppressed, so that high contrast can be realized.

  In addition, according to the present embodiment, the sub-wavelength structure layer 125 is not deteriorated by ultraviolet rays or the like, unlike the coloring by a dye or a pigment, so that the lifetime can be extended.

  In addition, according to the present embodiment, unlike the coloring by the dye or pigment, the light in the emission wavelength region of the phosphor layer 122 can be reflected almost completely and selectively by optimizing the sub-wavelength structure. Therefore, it is possible to achieve higher contrast and higher brightness at a higher level.

  Further, the selective reflection of light in the emission wavelength region by the sub-wavelength structure layer 125 is a color development phenomenon due to light interference caused by the fine structure of the wavelength of light or less, and light absorption like color development by a dye or pigment. Is not done electronically. Therefore, a material (for example, an inorganic material) that can withstand a high temperature process can be used as the material of the sub-wavelength structure layer 125, and can be easily implemented in the manufacturing process of the plasma display panel.

In this embodiment, as shown in FIG. 2, there is a gap between the insulator layer 123 and the phosphor layer 122, and the sub-wavelength structure layer 125 is formed in this gap. However, the present invention is not limited to this. However, the sub-wavelength structure layer may be formed in the phosphor layer without a gap. In this case, when the refractive index of the phosphor layer is nh, the phosphor layer including the sub-wavelength structure layer selects light in the emission wavelength region of the phosphor layer by satisfying the following formula (2). The same effect as described above can be obtained.
λ / 2 = a (n−nh) + b (2)

(Embodiment 2)
FIG. 3 is a schematic cross-sectional view of a plasma display panel (PDP) according to Embodiment 2 of the present invention, showing in cross section one discharge cell that is a light-emitting region spatially separated for each emission color. Yes. The PDP has the same basic configuration as that of the PDP corresponding to the first embodiment shown in FIG. 1, and the same components are denoted by the same reference numerals and the description thereof is omitted.

  A plasma display panel (PDP) 200 shown in FIG. 3 includes a front plate 110 and a back plate 220 that are spaced apart from each other. In particular, in the present embodiment, the back plate 220 is provided with the light absorption layer 221 between the partition wall 121 and the insulator layer 123 at the cell bottom portion and the sub-wavelength structure layer 125. The light absorption layer 221 may be provided between at least one of the partition wall 121 and the insulator layer 123 at the cell bottom surface portion and the sub-wavelength structure layer 125.

  The light absorbing layer 221 can be made of the following light absorbing material corresponding to the red (R), blue (B), and green (G) phosphor layers 122. For example, (1) a light-absorbing layer 221 between the sub-wavelength structure layer 125 and the partition wall 121 of the discharge cell having the phosphor layer 122 that emits red light and / or the insulator layer 123 at the cell bottom portion (that is, red The light absorption layer of the discharge cell having the phosphor layer emitting light) is composed of iron oxide, (2) the barrier rib 121 of the discharge cell having the phosphor layer 122 emitting blue light, and / or the insulator layer 123 at the cell bottom. The light absorption layer 221 between the wavelength structure layers 125 (that is, the light absorption layer of a discharge cell having a phosphor layer emitting blue light) has (3) a phosphor layer 122 emitting green light. The light absorbing layer 221 between the barrier 121 of the discharge cell and / or the insulator layer 123 at the cell bottom portion and the sub-wavelength structure layer 125 (that is, the light absorbing layer of the discharge cell having a phosphor layer emitting green light). , Koval It is possible to use green, respectively.

  As described above, the plasma display panel (PDP) 200 according to the present exemplary embodiment is provided between the partition wall 121 and the phosphor layer 122 and between the insulator layer 123 and the phosphor layer 122 at the cell bottom portion. A sub-wavelength structure layer 125 that selectively reflects light in the emission wavelength region of the phosphor layer 122 is provided, and between the sub-wavelength structure layer 125 and the partition wall 121 and / or the insulator layer 123 at the cell bottom surface portion, A configuration including the light absorption layer 221 is characterized.

  Next, the operation of the plasma display panel (PDP) 200 having the above configuration will be described.

  In the PDP 200, when a voltage is applied between the electrodes, a discharge is generated in the discharge cell 130, and ultraviolet light is generated from, for example, helium (He) atoms in the mixed gas. Then, the phosphor layer 122 is excited by the generated ultraviolet rays to generate visible light, and a display operation is performed. In other words, a display operation is performed in a minute region composed of a plurality of discharge cells that are intersections of the display electrode and the data electrode, and an image is displayed. At this time, the light shielding unit 117 absorbs external light and suppresses a decrease in contrast. Further, the antireflection film 118 suppresses reflection of external light and suppresses a decrease in contrast.

  Further, since the luminous flux from the phosphor layer 122 is efficiently reflected by the sub-wavelength structure layer 125 and is emitted to the front plate 110 side, the luminance is increased, and among the spectral components of external light, the phosphor Since reflection of light components other than the emission wavelength region of the layer 122 is suppressed, high contrast can be achieved. Further, in this embodiment, the external light component transmitted through the sub-wavelength structure layer 125 is more efficiently absorbed by the light absorption layer 221, so that a higher contrast can be realized. That is, the external light partially passes through the phosphor layer 122 and the sub-wavelength structure layer 125 and reaches the light absorption layer 221. The light absorption layer 221 causes external light other than the emission wavelength region of the phosphor layer 122. Is absorbed, the contrast is further improved.

  Thus, according to the present embodiment, light other than the emission wavelength region of the phosphor layer 122 is absorbed between the sub-wavelength structure layer 125 and the partition wall 121 and / or the insulator layer 123 at the cell bottom. Since the light absorption layer 221 is provided, in addition to the effects of the first embodiment, external light transmitted through the phosphor layer 122 and the sub-wavelength structure layer 125 is also emitted from the phosphor layer 122 by the light absorption layer 221. Outside light other than the area can be absorbed, and the contrast can be further improved.

  The light absorbing layer 221 may be made of a material that absorbs visible light, such as magnetite or titanium black. Although this can also improve the contrast, according to the present embodiment, external light other than the emission wavelength region of the phosphor layer 122 is absorbed, that is, only external light in the emission wavelength region of the phosphor layer 122 is absorbed. By not absorbing, the contrast can be further improved.

(Embodiment 3)
FIG. 4 is a schematic cross-sectional view of a plasma display panel (PDP) according to Embodiment 3 of the present invention, showing in cross section one of the discharge cells serving as light-emitting regions spatially separated for each emission color. Yes. The PDP has the same basic configuration as that of the PDP corresponding to the first embodiment shown in FIG. 1, and the same components are denoted by the same reference numerals and the description thereof is omitted.

  A plasma display panel (PDP) 300 shown in FIG. 4 includes a front plate 110 and a back plate 320 that are spaced apart from each other. In particular, in this embodiment, the back plate 320 includes a partition 321 having at least a surface having a light absorption function, and an insulator layer 322 having at least a surface on the discharge cell side of the cell bottom portion having a light absorption function. .

  The partition wall 321 defines a discharge space formed between the front plate 110 and the back plate 320 and forms a discharge cell 130. Each of the partition wall 321 and the insulator layer 322 on the cell bottom surface portion has a light absorption function at least on the surface (in particular, the surface on the discharge cell side in the case of the insulator layer 322 on the cell bottom surface portion). In addition, a sub-wavelength structure layer 125 that selectively reflects the emission wavelength region of the phosphor layer 122 is provided between the barrier layer 321 and the insulator layer 322 at the cell bottom surface portion and the phosphor layer 122. In other words, the partition wall 321 and the insulator layer 322 each having a light absorption function are provided under the sub-wavelength structure layer 125.

  The partition wall 321 and the insulator layer 322 have a function of absorbing light in a certain wavelength region at least on the surface. The partition 321 and the insulator layer 322 are formed by mixing light absorbing materials of the following materials corresponding to the red (R), blue (B), and green (G) phosphor layers 122, respectively. be able to. For example, (1) the discharge cell having the phosphor layer 122 that emits red light and the insulator layer 322 of the cell bottom portion of the discharge cell include iron oxide, and (2) the discharge cell having the phosphor layer 122 that emits blue light. The barrier ribs 321 and the insulator layer 322 at the bottom of the cell have cobalt aluminate, and (3) the barrier ribs 321 of the discharge cell having the phosphor layer 122 emitting green light and the insulator layer 322 at the bottom of the cell have cobalt Each constituent material mixed with green can be used.

  As described above, the plasma display panel (PDP) 300 according to the present exemplary embodiment is provided between the partition 321 and the phosphor layer 122 and between the insulator layer 322 and the phosphor layer 122 at the cell bottom portion. A sub-wavelength structure layer 125 that selectively reflects light in the emission wavelength region of the phosphor layer 122 is provided, and under this sub-wavelength structure layer 125, at least a partition wall 321 having a light absorption function and an insulator layer 322 are provided. It is characterized by the structure provided with.

  Next, the operation of the plasma display panel (PDP) 300 having the above configuration will be described.

  In the PDP 300, when a voltage is applied between the electrodes, a discharge is generated in the discharge cell 130, and ultraviolet light is generated from excited, for example, helium (He) atoms in a mixed gas. Then, the phosphor layer 122 is excited by the generated ultraviolet rays to generate visible light, and a display operation is performed. In other words, a display operation is performed in a minute region composed of a plurality of discharge cells that are intersections of the display electrode and the data electrode, and an image is displayed. At this time, the light shielding unit 117 absorbs external light and suppresses a decrease in contrast. Further, the antireflection film 118 suppresses reflection of external light and suppresses a decrease in contrast.

  Further, since the luminous flux from the phosphor layer 122 is efficiently reflected by the sub-wavelength structure layer 125 and is emitted to the front plate 110 side, the luminance is increased, and among the spectral components of external light, the phosphor Since reflection of light components other than the emission wavelength region of the layer 122 is suppressed, high contrast can be achieved. Further, in this embodiment, the external light component transmitted through the sub-wavelength structure layer 125 is more efficiently absorbed by the partition 321 and the insulator layer 322 having a light absorption function, so that a higher contrast is achieved. Can be realized. That is, the external light partially transmits through the phosphor layer 122 and the sub-wavelength structure layer 125 and reaches the surfaces of the partition wall 321 and the insulator layer 322, but these surfaces are outside the emission wavelength region of the phosphor layer 122. Since external light is absorbed, the contrast is further improved.

  As described above, according to the present embodiment, at least the surface of the partition wall 321 and the surface of the insulator layer 322 at the cell bottom portion at least the surface on the discharge cell side absorb light other than the emission wavelength region of the phosphor layer 122. Since it has an absorption function, in addition to the same effect as in the second embodiment, that is, in addition to the effect of the first embodiment, external light partially transmitted through the phosphor layer 122 and the sub-wavelength structure layer 125 is also obtained. The partition wall 321 and the insulator layer 322 having a light absorption function can absorb external light other than the emission wavelength region of the phosphor layer 122, and the contrast can be further improved.

  Note that the partition 321 and the insulator layer 322 may be formed by mixing a material that absorbs visible light, such as magnetite or titanium black. Although this can also improve the contrast, according to the present embodiment, external light other than the emission wavelength region of the phosphor layer 122 is absorbed, that is, only external light in the emission wavelength region of the phosphor layer 122 is absorbed. By not absorbing, the contrast can be further improved.

  In this embodiment, the partition 321 and the insulator layer 322 each having a light absorption function are provided under the sub-wavelength structure layer 125, but the present invention is not limited to this, and the light absorption function is provided. It is sufficient that the surface exists even in a partial region. For example, only one of the partition layer and the insulator layer on the cell bottom surface portion may have a light absorption function. In this embodiment mode, the surface of the cell bottom is an insulator layer 322, and this insulator layer 322 has a light absorption function. Is not limited.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  For example, in each of the embodiments described above, the sub-wavelength structure layer 125 is provided between the partition walls 121 and 321 and the phosphor 122 and between the cell bottom and the phosphor layer 122. The layer 125 has any structure as long as it selectively reflects light in the emission wavelength region of the phosphor layer 122 due to light interference caused by a fine structure having a wavelength of light or less. May be.

  Further, in each of the above embodiments, the name “Plasma Display Panel (PDP)” is used. However, this is for convenience of explanation, and for example, it may be a plasma display device or a PDP display device. is there.

  The plasma display panel of the present invention is useful for plasma display panels that require high contrast and high brightness. That is, it is possible to display a bright image with high contrast, which can contribute to high performance and power saving of TV receivers and information terminal displays.

Sectional drawing of the plasma display panel which concerns on Embodiment 1 of this invention Enlarged sectional view of the subwavelength structure layer of the plasma display panel according to the first embodiment Sectional drawing of the plasma display panel which concerns on Embodiment 2 of this invention Sectional drawing of the plasma display panel which concerns on Embodiment 3 of this invention

Explanation of symbols

100, 200, 300 Plasma display panel (PDP)
DESCRIPTION OF SYMBOLS 110 Front plate 110a Front substrate 111, 113 Transparent electrode 112, 114 Metal electrode 115 Dielectric layer 116 Protective layer 117 Light-shielding part 118 Antireflection film 120, 220, 320 Back plate 120a, 220a, 320a Rear substrate 121, 321 Partition 122 Fluorescence Body layer 123, 322 Insulator layer 124 Data electrode 125 Sub-wavelength structure layer 130 Discharge cell 221 Light absorption layer

Claims (5)

A front plate and a back plate that are spaced apart from each other, a partition that partitions a discharge space formed between the front plate and the back plate, and a discharge cell partitioned by the partition. A plasma display panel comprising a phosphor layer and electrodes arranged on the front plate and the back plate, respectively, for generating a discharge in the discharge cell,
Selectively emits light in the emission wavelength region of the phosphor layer between the barrier rib and the phosphor layer and / or between the cell bottom surface of the back plate facing the discharge cell and the phosphor layer. A sub-wavelength structure layer that reflects
Plasma display panel.   The plasma display panel according to claim 1, further comprising a light absorption layer between the partition wall and / or the cell bottom and the sub-wavelength structure layer.   The plasma display panel according to claim 2, wherein the light absorption layer is a layer that absorbs light outside the emission wavelength region of the phosphor layer.   The plasma display panel according to claim 1, wherein at least a surface of the partition wall and / or the cell bottom surface on the discharge cell side has a light absorption function.   The plasma display panel according to claim 4, wherein the light absorption function is a function of absorbing light outside a light emission wavelength region of the phosphor layer.

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