JP2003346665A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim at improvement of brightness of a phosphor layer and lowering of brightness during driving of a panel. <P>SOLUTION: The device is provided with a front panel formed with a plurality of electrodes arrayed on one main face and a back panel arranged in opposition so as to form a discharge space divided off by a partition wall between the panels and equipped with a back-face phosphor layers 111R, 111G, 111B emitting visible lights of red, green and blue colors excited by an vacuum ultraviolet ray with a central wavelength of 147 nm, and is further provided with a front-face phosphor layer 108 emitting ultraviolet rays of 250 nm to 370 nm excited by a vacuum ultraviolet ray with the central wavelength of 147 nm on the main face side fitted with the electrodes of the front panel. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device used for displaying an image on, for example, a television.

[0002]

2. Description of the Related Art In recent years, in a color display device used for image display such as a computer and a television, a plasma display device using a plasma display panel (hereinafter, referred to as PDP) has been realized to be large, thin, and lightweight. It is drawing attention as a possible color display device.

[0003] The plasma display device is a so-called 3
Full-color display is performed by additively mixing the primary colors (red, green, and blue). In order to perform this full color display, the plasma display device is provided with a phosphor layer that emits each of the three primary colors red (R), green (G), and blue (B), and constitutes the phosphor layer. Phosphor particles are PD
It is excited by vacuum ultraviolet light having a center wavelength of 147 nm generated in the P discharge cell, and emits visible light of each color.

FIG. 5 is a partially sectional perspective view of a conventional general PDP. As shown in FIG. 5, the PDP is arranged such that a front glass substrate 1 constituting a front panel and a rear glass substrate 2 constituting a rear panel face each other in parallel via a partition wall 3.

A plurality of display electrodes 4a and a plurality of display scan electrodes 4b (only two are shown in FIG. 1) are striped on the main surface of the front glass substrate 1 facing the rear glass substrate 2. And are arranged in parallel alternately. Each of the electrodes 4a and 4b is covered with a dielectric layer 5 made of lead glass or the like, and a protective film 6 made of MgO is formed on the dielectric layer 5, thereby forming a front panel.

On the other hand, on the main surface of the rear glass substrate 2 facing the front glass substrate 1, stripe-shaped address electrodes 7 (only four are shown in the figure) are provided so as to cover the surface. And a dielectric layer 8 made of lead glass or the like, and a partition wall 3 is formed adjacent to the address electrode 7. Red (R), green (G), and blue (B) phosphor layers 9R, 9G, and 9B are formed in the concave portions of the adjacent partition walls 3, thereby forming a rear panel.

With the above configuration, each electrode 4 is located in the discharge space 10 between the front glass substrate 1 and the rear glass substrate 2.
Cells serving as unit light emitting regions are formed at intersections of the address electrodes 7a and 4b. The discharge space 10 is filled with an inert gas mainly composed of, for example, neon (Ne) and xenon (Xe).

When an image is displayed on the PDP, a discharge is caused between the display electrode 4a and the display scan electrode 4b in a corresponding cell of the discharge space 10, and vacuum ultraviolet rays having a center wavelength of 147 nm generated at that time are subjected to fluorescent light of each color. Body layer 9R,
Full-color display can be achieved by additively mixing visible light of three primary colors of red, green and blue generated by exciting 9G and 9B.

The phosphors of each color used in such a PDP are provided so as to match the color balance at the time of displaying white, and the phosphor layers 9R, 9G and 9B have initial luminances of the respective phosphors. Since the characteristics vary depending on the characteristics, in order to prevent the color temperature from lowering in the initial state of the PDP, for example, a blue cell pitch with low luminance is set larger than other colors, or the lowest luminance is obtained by signal processing during driving. The number of sustain discharges of other phosphors is reduced and used in accordance with the phosphor.

[0010]

However, the above-mentioned conventional PDP has problems in luminance and efficiency as described below.

Ultraviolet light generated from a Ne—Xe-based discharge gas used in a PDP is called vacuum ultraviolet light, and its central wavelength is mainly 147 nm. PD used conventionally
A first problem of the phosphor layer for P is low energy conversion efficiency by receiving the energy of 147 nm vacuum ultraviolet light and converting it into visible light of 400 nm to 600 nm.

The second problem is that the 147 nm vacuum ultraviolet light is emitted as a spherical wave over the entire discharge space.
On the front plate side where the phosphor is not applied, vacuum ultraviolet light
It is not used at all. That is, MgO on the front glass substrate side absorbs the reached vacuum ultraviolet light and is hardly reflected, and thus is wasted.

[0013] By these two problems, PDP is
It is said that the luminance and the efficiency are poor (for example, Journal of the Institute of Image Information and Television Engineers, Vol. 53, No. 18, 1067, 1999).

The present invention has been made in view of such problems, and has as its object to improve the luminance and efficiency of a phosphor.

[0015]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a front panel having a main surface provided with electrodes.
Excited by vacuum ultraviolet light having a center wavelength of 147 nm, 2
This is provided with a front phosphor layer that emits ultraviolet light having a wavelength of 50 nm to 370 nm, and can improve the luminance and efficiency of the phosphor.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, according to the first aspect of the present invention, a front panel formed by arranging a plurality of electrodes on one main surface is partitioned by a partition between the front panel. Excited by vacuum ultraviolet rays having a center wavelength of 147 nm and arranged in red so that a discharge space is formed,
A back panel provided with a back phosphor layer that emits visible light of each color of green and blue, and the main surface of the front panel on which the electrodes of the front panel are provided is excited by vacuum ultraviolet light having a center wavelength of 147 nm. And a front phosphor layer that emits ultraviolet light having a wavelength of 250 nm to 370 nm.

According to a second aspect of the present invention, a front panel in which a plurality of electrodes are arranged on one main surface is formed, and a discharge space partitioned by a partition is formed between the front panel. And a back panel provided with a back phosphor layer that emits visible light of each color of red, green, and blue when excited by vacuum ultraviolet light having a center wavelength of 147 nm. Wavelength 250nm-37
A phosphor layer that emits visible light by ultraviolet light of 0 nm is provided.

Further, the invention described in claim 3 is the same as the invention.
1, the front phosphor layer is made of Ca _Three(PO_Four)_Two: T
1, SrB_FourO₇F: Eu, BaMg_TwoSi_TwoO₇: Pb,
Sr_TwoP_TwoO₇: Eu, BaZnMgSi_TwoO₇: Pb, B
aSi_TwoO_Five: Pb, (Ca, Zn)_Three(PO_Four)_Two: T
1, YPO_Four: Ce, YF_Three: (Gd, Pr) phosphor
Consisting of a compound represented by at least one of the following:
It is characterized by.

The invention described in claim 4 is the first invention.
Or in 2, the red phosphor of the back phosphor layer is YVO
_Four: Eu, Y_TwoO_Three: Eu, (Y, Gd) BO_Three: Eu no
Any one of the above, wherein the green phosphor is Zn_TwoSiO_Four: M
n, Y_TwoSiO_Five: One of Ce and Tb,
Blue phosphor is BaMgAl_TenO₁₇: Eu, MeMgSi
_TwoO₆: Eu (where Me is one of Ca, Sr and Ba)
One or more), MeMgSi_TwoO₈: Eu (just
And Me is at least one of Ca, Sr, and Ba.
Above)
It is characterized by the following.

The invention described in claim 5 is the first invention.
Or 2) the visible light transmittance of the front phosphor layer is larger than the visible light transmittance of the back phosphor layer.

Further, the invention according to claim 6 is characterized in that, in claim 1 or 2, the diameter of the phosphor particles is 4.0 μm or less, and the thickness of the front phosphor layer is 10 μm or less. And

The present invention is characterized in that a phosphor which emits ultraviolet light of 250 nm to 370 nm by excitation of vacuum ultraviolet light mainly composed of 147 nm generated from a Ne—Xe discharge gas is provided at least on the front panel side. I do.

A conventional PDP has Mg on the front panel side.
O faces the discharge space, and the 147 nm vacuum ultraviolet light emitted toward the front panel by the discharge of the Ne—Xe gas is M
All gO absorbed and hardly reflected in the direction of the back panel.

On the other hand, when the front panel is provided with a phosphor which is excited by vacuum ultraviolet light of 147 nm and emits longer ultraviolet light of 250 to 370 nm on the front panel side, the converted long wavelength ultraviolet light is provided. Light is emitted toward the back panel. That is, apparently, the vacuum ultraviolet light conventionally absorbed by the front panel becomes ultraviolet light of 250 nm to 370 nm, which excites the phosphor on the rear panel side and emits visible light, thereby reducing the brightness of the panel. improves. In particular, BaMgAl ₁₀ O ₁₇ : Eu or ZnSi ₂ O ₄ : Mn,
For a panel such as Y ₂ O ₃ : Eu having a phosphor having a high excitation band in the range of 250 nm to 350 nm provided on the back panel side, the luminance is further improved.

When the wavelength of light exceeds 370 nm,
Since blue emission can be seen, there is no problem if the phosphor coating area on the front panel side is only on blue on the back panel side,
When the entire surface is applied, the red and green portions on the rear panel side are mixed with blue, which is not preferable.

That is, the conventional ultraviolet-visible conversion process is as follows:
While the 147 nm vacuum ultraviolet light was converted to 400 nm to 650 nm visible light, the present invention converts the 147 nm vacuum ultraviolet light radiated toward the front panel toward the 250 nm to 370 nm ultraviolet light once. Convert to MgO
Since the above-mentioned absorption loss is eliminated and visible light of 400 nm to 650 nm is converted, the energy conversion efficiency is also improved.

Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic plan view of the PDP with the front glass substrate removed, and FIG. 2 is a perspective view showing a part of an image display area of the PDP in a cross section. In FIG. 1, the number of display electrode groups, display scan electrode groups, address electrode groups, and the like are partially omitted for clarity.

As shown in FIG. 1, a PDP 100 has a front glass substrate 101 (not shown) and a rear glass substrate 10.
2, N display electrodes 103, N display scan electrodes 104 (the number is attached when indicating the Nth electrode), and M
It is composed of a group of address electrodes 107 (the number is given when the M-th line is indicated) and an airtight seal layer 121 indicated by oblique lines, and has an electrode matrix of a three-electrode structure with each of the electrodes 103, 104 and 107. A cell is formed at the intersection of the display electrode 103, the display scan electrode 104, and the address electrode 107. 123 is an image display area.

This PDP 100 is, as shown in FIG.
A display electrode 103 and a display scan electrode 104 made of ITO and silver, a dielectric glass layer 105 made of lead glass, a protective layer 106 made of MgO, and a front phosphor layer 108 are provided on one main surface of the front glass substrate 101. And the address electrode 107 made of silver, the visible light reflecting layer 109, and the partition wall 1 on one main surface of the rear glass substrate 102.
10, and a back panel on which the phosphor layers 111R, 111G, and 111B are provided, and a discharge gas is sealed in a discharge space 122 formed between the front panel and the back panel.

The front phosphor layer 108 is excited by vacuum ultraviolet light centered at 147 nm and has a wavelength of 250 nm to 370 nm.
This is a layer to which phosphor particles emitting ultraviolet light of nm are bound, and is formed on the surface of the protective layer 106 corresponding to the phosphor layers 111R, 111G, and 111B.

The visible light reflecting layer 109 is, for example, a layer made of a dielectric glass containing titanium oxide, and is formed so as to cover the address electrodes 107. The fluorescent layers 111R, 111G, It has a function of reflecting the visible light generated in 111B and a function as a dielectric.

The partition 110 is formed on the surface of the visible light reflecting layer 109 in parallel with the address electrode 107. Each of the phosphor layers 111R, 111G, and 11 is formed in a concave portion between the partitions 110 and the side walls of the partition 110.
1B are formed in order.

The back phosphor layers 111R, 111G, 1
11B is a layer to which phosphor particles emitting red (R), green (G), and blue (B) are respectively bonded, and the address electrodes 10B of the phosphor layers 111R, 111G, and 111B.
The thickness in the stacking direction on 7 is preferably about 8 to 20 times the average particle size of each phosphor particle. That is, the rear phosphor layer absorbs the ultraviolet rays generated in the discharge space without transmitting the phosphor particles in order to secure the brightness (luminous efficiency) when the rear phosphor layer is irradiated with a certain ultraviolet ray. It is desirable to maintain a thickness of at least 8 layers, preferably about 10 layers, and if the thickness is more than that, the luminous efficiency of the back phosphor layer is almost saturated, and about 20 layers are stacked. If the thickness exceeds the thickness, the size of the discharge space 122 cannot be sufficiently secured.

In the PDP 100, the front panel and the rear panel are attached to each other, the periphery of the panel is sealed by a hermetic sealing layer 121, and a discharge gas (for example, helium or neon) is formed in a discharge space 122 formed therebetween. A mixed gas of xenon) is sealed, and a plasma display device is configured by connecting to a PDP driving device shown in FIG.

As shown in FIG. 3, the PDP 100 includes a display driver circuit 153, a display scan driver circuit 154, and an address driver circuit 1 as shown in FIG.
55, the display scan electrode 104 in a cell to be turned on under the control of the controller 152.
By applying a voltage to the address electrodes 107 and the address electrodes 107, an address discharge is performed therebetween, and then a sustain voltage is applied by applying a pulse voltage between the display electrodes 103 and the display scan electrodes 104. Due to the sustain discharge, ultraviolet rays are generated in the cells, and the phosphor layers excited by the ultraviolet rays emit light, thereby lighting the cells. An image is displayed by a combination of lighting and non-lighting of each color cell.

Next, the structure of the front panel of the present invention will be described in more detail.

FIG. 4 is a partially enlarged sectional view of the PDP in FIG. 2 viewed from the y-axis direction. As shown in FIG.
The front phosphor layer 108 that converts vacuum ultraviolet light of nm to ultraviolet light of 250 to 370 nm has phosphor layers 111R and 111R.
G, 111B. The phosphor particles forming the front phosphor layer 108 are preferably spherical. If the particles are spherical, the front panel can easily pass light emitted from the rear panel side as compared with the case where non-spherical particles are used, and the luminance is improved. This front phosphor layer 108
The fluorescent particles used for (1) will be described later.

By forming the front phosphor layer 108, visible light emitted from the phosphor layers 111R, 111G, and 111B hardly passes through the front glass substrate 101,
The brightness of the PDP may be reduced. Therefore, the visible light transmittance of the front phosphor layer 108 is
It is desirable to make it larger than the visible light transmittance of R, 111G, and 111B. This visible light transmittance can be achieved by changing the film thickness and porosity of the front phosphor layer 108, increasing the visible light transmittance of the bulk of the phosphor itself, or reducing the film thickness. It is preferable to use such a phosphor.

Next, a method of manufacturing the above-described PDP 100 will be described with reference to FIGS.

First, a method of manufacturing the front panel will be described. First, the front panel is formed on the front glass substrate 101 by first each of n display electrodes 103 and display scan electrodes 1.
04 (only two of them are shown in FIG. 2) are alternately and parallelly formed in stripes, then covered with a dielectric glass layer 105, and further covered with a protective layer 10
6 is formed.

Display electrode 103 and display scan electrode 1
Reference numeral 04 denotes an electrode made of ITO (transparent electrode) and silver. The electrode is formed by forming a pattern by a photolithography method and then baking.

The dielectric glass layer 105 is formed by applying a paste containing a lead-based or zinc-based glass material by screen printing, and then applying a predetermined temperature and a predetermined time (for example, 2 hours at 560 ° C.).
0 minutes), the thickness of the predetermined layer (25 μm) is obtained.
m). As the lead-based or zinc-based glass, for example, PbO (70 wt.
%), B ₂ O ₃ (15 wt%), SiO ₂ (10 wt%)
%) And glass of Al ₂ O ₃ (5 wt%), ZnO (37 wt%), B ₂ O ₃ (34 wt%), Si
O ₂ (15 wt%), Al ₂ O ₃ (6 wt%), K ₂ O (6 wt%)
wt%), a mixture of MnO ₂ (2 wt%) glass and an organic binder (10% ethyl cellulose dissolved in α-terpineol). Here, the organic binder is a resin dissolved in an organic solvent, and an acrylic resin as a resin other than ethyl cellulose,
Butyl carbitol and the like can also be used as the organic solvent. Further, a dispersant (for example, glycerol triolate) may be mixed with such an organic binder.

The protective layer 106 is made of magnesium oxide (Mg).
O), for example, by sputtering or C
Predetermined thickness (0.5 μm) by VD (chemical vapor deposition)
It is formed so that

The front phosphor layer 108 is made of vacuum ultraviolet light (14
7 nm) is converted to ultraviolet light (250 to 370 nm) by applying paste-form phosphor ink including phosphor particles and an organic binder onto MgO by a screen printing method or the like, patterning the MgO as necessary, ℃ -5
By burning at a temperature of 90 ° C. to burn off the organic binder, the phosphor particles are bound and formed. Also,
It can also be formed by patterning using a photolithography method.

Next, a method of manufacturing the rear panel will be described. The rear panel is formed by first printing a photosensitive silver paste for an electrode on the rear glass substrate 102, patterning the same by a photolithography method, and then firing. The address electrodes 107 are formed in a state of being arranged. A paste containing a lead-based or zinc-based glass material is applied thereon by a screen printing method to form a visible light reflecting layer 109, and a partition 110 is formed thereon by a photolithography method or a sandblast method. The partition 110 divides the discharge space 122 into cells (unit light emitting regions) in the X-axis direction.

Then, paste-like phosphor ink composed of red (R), green (G), and blue (B) phosphor particles and an organic binder is applied to the grooves between the partitions 110. I do. Next, by firing this at a temperature of 400 to 590 ° C. to burn off the organic binder,
Phosphor layers 111R and 111 formed by binding each phosphor particle
G and 111B are formed. As the respective phosphor particles, spherical phosphor particles obtained by a hydrothermal synthesis method or the like are preferable for the same reason as the above-mentioned front phosphor layer.

The front panel and the rear panel manufactured as described above are overlapped so that the electrodes on the front panel and the address electrodes on the rear panel are orthogonal to each other, and sealing glass is inserted around the periphery of the panel. For example, 45
Baked at about 0 ° C. for 10 to 20 minutes to form an airtight seal layer 121.
And a high vacuum (for example, 1.1 ×
After evacuating to 10 ^-4 Pa), a discharge gas (for example, He-
An Xe-based or Ne-Xe-based inert gas) is sealed at a predetermined pressure to produce the PDP 100.

Here, the phosphor ink applied to the front panel and the rear panel will be described. This phosphor ink is obtained by mixing phosphor particles, a binder, and a solvent, and 100 to 30,000 centipoise (0.1 Pa.s). s
-30 Pa. s)
If necessary, a surfactant, a dispersant (0.1 to 5 wt.
%) May be added.

The phosphor used for the front panel has excellent transmittance for visible light and Ne-X
e, 1 generated by the discharge of a mixed gas such as He-Xe
Excited by vacuum ultraviolet light centered at 47 nm,
A phosphor that generates ultraviolet light of 250 nm to 370 nm is used. As such a phosphor, Ca ₃ (PO ₄ )
₂ : Tl, SrB ₄ O ₇ F: Eu, BaMg ₂ Si ₂ O ₇ : P
b, Sr ₂ P ₂ O ₇ : Eu, BaZnMgSi ₂ O ₇ : P
b, BaSi ₂ O ₅ : Pb, (Ca, Zn) ₃ (P
O ₄ ) ₂ : Tl, YPO ₄ : Ce, YF ₃ : (Gd, P
r), a compound represented by one or more of SrB ₄ O ₇ : Eu phosphors.

These phosphors can be synthesized by a generally used solid-phase reaction method (in the case of mixing oxides, carbonates, nitrates or fluorides of the respective elements constituting the phosphor and mixing them in air or with nitrogen or argon). , A method of baking in water) is preferable, but it is more preferable to use particles which are formed into a spherical shape using a liquid spray method, a sol-gel method, or a hydrothermal synthesis method.

The thickness of the phosphor is preferably as thin as possible because more visible light from the phosphor on the back panel passes through the front panel. UV light (250 nm to 370 n
The emission intensity of m) is undesirably reduced. Therefore, the preferred thickness on the front plate side is 1 μm to 20 μm.

On the other hand, the phosphor used for the back panel is
147 nm vacuum ultraviolet light and 250 nm to 370 nm
It is preferable to use a phosphor that emits light strongly by the ultraviolet light. Among such phosphors, as a red phosphor,
_{(Y, Gd) 1-x} BO 3: Eu x, Y 2-x O 3: Eu x or Y _x VO _4: a compound represented by Eu _x is used. These are compounds in which a part of the Y element constituting the base material is replaced by Eu. Here, Eu for the Y element
The substitution amount X of the element is preferably in the range of 0.05 ≦ X ≦ 0.2.

As the green phosphor, Y _2x SiO ₅ : C
e _x, Tb _x or Zn _2-x SiO _4: a compound represented by Mn _x is used. _{Y 2x SiO 5: Ce x,} Tb x is a compound partially substituted Ce, the Tb of Y element composing its maternal material, Zn _2x SiO _4: Mn _x is the base material It is a compound in which a part of the constituent Zn element is substituted by Mn. Here, the substitution amount X of Ce, Tb and Mn with respect to Y, the element and the Zn element is 0.01 ≦ X ≦
It is preferably in the range of 0.2.

As the blue phosphor, Ba _1-x MgAl _{10
O 17: Eu x, Ba 1} -xy Sr y MgAl 10 O 17: Eu x,
Me _x MgSi ₂ O ₈ : E _x , (where Me is Ca,
One or more of Sr and Ba) or Me _x
MgSi ₂ O _6: Eu _x (where, Me is, Ca, Sr,
A compound represented by any one or more of Ba) is used. These compounds are compounds in which Ca and Ba elements constituting the base material are partially substituted with Sr or Eu. Here, the substitution amounts Y and X of the Sr element and the Eu element with respect to the Ca and Ba elements are respectively 0.1 ≦ Y ≦
It is preferable to be in the range of 0.5, 0.03 ≦ X ≦ 0.25.

Each of the phosphors used for the red, blue and green rear panels has a wavelength of 250 nm.
It is particularly preferable because the excitation efficiency is high with respect to ultraviolet light of up to 370 nm.

For each of these phosphor particles, those obtained by a commonly used baking method (solid phase method) may be used, but spherical particles obtained by a hydrothermal synthesis method or a solution spraying method may be used. If the phosphor particles are used, the luminance of each color can be further increased.

As the binder to be mixed with the phosphor ink, ethyl cellulose or acrylic resin (0.1% of the ink) is used.
-10% by weight), and α-terpineol and butyl carbitol can be used as the solvent. PMMA and PVA are used as binders.
Polymers such as diethylene glycol,
Organic solvents such as methyl ether and water can also be used.

As a specific embodiment of the present invention, each phosphor particle on the rear panel of the PDP has a red color (Y, G).
d) BO ₃ : Eu, Y ₂ O ₃ : Eu, YVO ₄ : Eu, green is Zn ₂ SiO ₄ : Mn, Y ₂ SiO ₅ : Ce, Tb, blue is BaMgAl ₁₀ O ₁₇ : Eu, MeMgSi ₂ O ₈ : E
u, MeMgSi ₂ O ₆ : Eu, and the film thickness was 30 μm. Ca ₃ (PO ₄ ) as the phosphor layer on the front panel side
₂ : Tl (No. 1), SrB ₄ O ₇ F: Eu (No.
2), BaMg ₂ Si ₂ O ₇ : Pb (No. 3), (C
a, Zn) ₃ (PO ₄ ) ₂ : Tl (No. 4), BaZn
MgSi ₂ O ₇ : Pb (No. 5), BaSi ₂ O ₅ : Pb
(No. 6), SrB ₄ O ₇ : Eu (No. 7), YPO
₄ : Ce (No. 8), YF ₃ : Gd, Pr (No. 9)
Were prepared at the respective thicknesses.

Here, a PDP having a size of 42 inches was used, the height of the partition walls 110 was set to 0.1 mm, and the interval between the partition walls 110, that is, the cell pitch was set to 0.36 mm. The composition of the discharge gas is xenon gas (5
%) And neon (95%), and the sealing pressure was 66500 Pa.

On the other hand, except that no front phosphor layer was provided, the above sample No. A panel was produced in the same manner as in Nos. 1 to 9 (No. 10). Table 1 shows the manufacturing conditions for these samples.

First, the sample no. The initial luminances of 1 to 9 were measured by displaying white so that the luminance utilization rate of each color became 100%. Then, the luminance of these PDPs (luminance during full white display), the luminance after continuous white display for 5000 hours, and the rate of change were measured. Table 1 shows the results of this experiment.
Is shown in

[0063]

[Table 1]

As can be seen from Table 1, 147 nm vacuum ultraviolet light was applied to the front panel side according to the present embodiment at 250 nm.
Samples Nos. 1 to 9 provided with a phosphor that converts the light into a wavelength of up to 350 nm have a high luminance, and the luminance and the color temperature are less reduced even after continuous driving for 5000 hours. On the other hand, Sample No. 10 in which no phosphor is provided on the front panel side has a low luminance and a large deterioration.

From the above results, it can be seen that 147n is provided on the front panel side.
250 nm to 370 n when excited by vacuum ultraviolet light
m by forming a phosphor layer that emits ultraviolet light,
The luminance of the DP can be improved, and the luminance degradation due to panel driving can be reduced.

[0066]

As described above, the plasma display device of the present invention comprises a front panel on which a phosphor excited by 147 nm vacuum ultraviolet rays to emit ultraviolet rays of 250 nm to 370 nm, electrodes, vacuum ultraviolet rays and ultraviolet rays. A discharge space in which a gas medium is sealed is formed between the front panel and a rear panel in which phosphors that emit red, blue, and green light are disposed.
250 nm to 370 n when excited by vacuum ultraviolet light
m by forming a phosphor layer that emits ultraviolet light,
It is possible to improve the luminance of the DP and reduce luminance deterioration due to panel driving.

[Brief description of the drawings]

FIG. 1 is a plan view of a plasma display panel according to an embodiment of the present invention, excluding a front glass substrate.

FIG. 2 is a perspective view partially showing a cross section of the structure of an image display area of the panel.

FIG. 3 is a block diagram of a plasma display device using the panel.

FIG. 4 is a sectional view showing a structure of an image display area of the panel.

FIG. 5 is an enlarged cross-sectional view of a part of a conventional PDP when viewed from the x-axis direction.

[Explanation of symbols]

100 PDP 101 Front glass substrate 102 Back glass substrate 103 Display electrode 104 Display scan electrode 107 address electrode 108 Front phosphor layer 109 visible light reflective layer 111R, 111G, 111B phosphor layer 122 discharge space

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) C09K 11/71 CPW C09K 11/71 CPW 11/78 CPL 11/78 CPL 11/79 CPM 11/79 CPM 11/81 CPF 11/81 CPF 11/82 Cpk 11/82 Cpk 11/85 CQA 11/85 CQA (72) Inventor Kazuhiko Sugimoto 1006 Ojidoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Mitsuhiro Otani Osaka 1006 Kadoma Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroshi Setoguchi 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term in Sangyo Co., Ltd. (reference) 4H001 CA02 CA04 CA05 XA05 XA08 XA09 XA12 XA13 XA14 XA15 XA20 XA23 XA30 XA38 XA39 XA56 XA64 YA25 YA58 YA59 YA63 YA64 YA81 YA82 5C040 FA01 FA04 GB03 GB14 GG03 KB03 GG03 KB03 GG03 KB03

Claims (6)

[Claims] 1. A front panel formed by arranging a plurality of electrodes on one main surface, and a front panel having a center wavelength of 147 nm disposed so as to form a discharge space partitioned by partition walls between the front panel. A back panel provided with a back phosphor layer that emits visible light of each color of red, green, and blue when excited by vacuum ultraviolet light of the above, and a main surface side on which electrodes of the front panel are provided, A plasma display device comprising a front phosphor layer that emits ultraviolet light having a wavelength of 250 nm to 370 nm when excited by vacuum ultraviolet light having a wavelength of 147 nm. 2. A front panel formed by arranging a plurality of electrodes on one main surface, and a front panel having a center wavelength of 147 nm, which is disposed opposite to the front panel so that a discharge space separated by a partition is formed between the front panel and the front panel. A back panel provided with a back phosphor layer that emits visible light of each color of red, green, and blue when excited by vacuum ultraviolet rays, and
A plasma display device comprising a phosphor layer that emits visible light with ultraviolet light having an excitation wavelength of 250 nm to 370 nm. 3. The front phosphor layer is made of Ca ₃ (PO ₄ ) ₂ : T.
1, SrB ₄ O ₇ F: Eu, BaMg ₂ Si ₂ O ₇ : Pb,
Sr ₂ P ₂ O ₇ : Eu, BaZnMgSi ₂ O ₇ : Pb, B
aSi ₂ O ₅ : Pb, (Ca, Zn) ₃ (PO ₄ ) ₂ : T
1, YPO ₄ : Ce, YF ₃ : (Gd, Pr), SrB ₄
O _7: Eu phosphor plasma display apparatus according to claim 1, characterized in that is constituted by a compound represented by any one or more of. 4. The red phosphor of the back phosphor layer is (Y, G)
_{d) 1-x BO 3:} Eu x, Y 2-x O 3: Eu x or Y _x V
O _4: a compound represented by any one of the Eu _x, a green phosphor is _{Y 2x SiO 5: Ce x,} Tb x or Zn _2x S
iO _4: a compound represented by any one of the Mn _x,
Blue phosphor _{Ba 1-x MgAl 10 O 17} : Eu x, Ba
_{1-xy Sr y MgAl 10 O} 17: Eu x, Me x MgSi
₂ O _8: Eu _x, (although, Me is, Ca, Sr, any one or more of Ba) or Me _x MgSi
₂ O _6: Eu _x (although, Me is, Ca, Sr, any one or more of Ba) according to claim 1 or 2, characterized in that is constituted by a compound represented by any one of a
The plasma display device according to item 1. 5. The plasma display device according to claim 1, wherein the visible light transmittance of the front phosphor layer is larger than the visible light transmittance of the back phosphor layer. 6. The plasma display device according to claim 1, wherein the particle size of the phosphor particles is 4.0 μm or less, and the thickness of the front phosphor layer is 10 μm or less.