JP3797084B2 - Plasma display device - Google Patents

Plasma display device Download PDF

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Publication number
JP3797084B2
JP3797084B2 JP2000292069A JP2000292069A JP3797084B2 JP 3797084 B2 JP3797084 B2 JP 3797084B2 JP 2000292069 A JP2000292069 A JP 2000292069A JP 2000292069 A JP2000292069 A JP 2000292069A JP 3797084 B2 JP3797084 B2 JP 3797084B2
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JP
Japan
Prior art keywords
phosphor
discharge
plasma display
display device
surface potential
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2000292069A
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Japanese (ja)
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JP2001236893A (en
Inventor
茂行 奥村
宇太郎 宮川
繁郎 春木
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松下電器産業株式会社
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Priority to JP11-354679 priority
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display device using excitation and emission of a phosphor by vacuum ultraviolet rays generated from rare gas discharge.
[0002]
[Prior art]
In the AC type plasma display device, as shown in FIG. 9, the front-side substrate 21 and the back-side substrate 22 are arranged to face each other with the discharge space 23 interposed therebetween. On the surface-side substrate 21, a stripe-shaped scanning electrode 26 and a sustaining electrode (not shown) which are covered with the dielectric layer 24 and the protective layer 25 and form a pair extend in a direction parallel to the paper surface. ing. On the back substrate 22, stripe-shaped data electrodes 27 are formed in a direction orthogonal to the scan electrodes 26 and the sustain electrodes. Striped barrier ribs 28 are arranged between the data electrodes 27 and partition discharge cells 29 together with the front-side substrate 21 and the back-side substrate 22. A phosphor 30 is attached from the data electrode 27 to the side wall of the partition wall 28. The phosphor 30 is attached to each discharge cell 29 one color at a time, and red, green, and blue phosphors are sequentially arranged.
[0003]
In the plasma display device, the phosphor 30 applied to the display cell is excited and emitted by vacuum ultraviolet rays having a wavelength of 147 nm generated from a rare gas discharge, and color display is performed using the emitted light. The materials used as the phosphor 30 are generally europium-activated yttrium borate, gadolinium phosphor (Y, Gd) BO 3 : Eu as a red phosphor, and a manganese-activated zinc silicate phosphor as a green phosphor. As the Zn 2 SiO 4 : Mn, blue phosphor, europium activated barium magnesium aluminate phosphor BaMgAl 10 O 17 : Eu is used.
[0004]
Conventionally, Zn 2 SiO 4 : Mn phosphor has been generally used as the green light emitting component.
[0005]
[Problems to be solved by the invention]
A Zn 2 SiO 4 : Mn green phosphor generally used as a green phosphor has a negative surface potential. FIG. 10 shows blow-off charge amounts of various phosphors. As can be seen from FIG. 10, only Zn 2 SiO 4 : Mn is negatively charged, and it is assumed that the variation in discharge characteristics in the plasma display device is caused by this charge amount.
[0006]
When applying voltage for display on the phosphor screen using this phosphor, the present inventors often experience discharge variations or discharge errors that do not generate discharge more frequently than phosphors having positive polarity. I found. This phenomenon makes it necessary to increase the set drive voltage in order to increase the voltage until the display quality is deteriorated or the display is completely lit to maintain high quality.
[0007]
The charge amount of the phosphor is a physical property value determined by the type of the material, and it is difficult to change it. As a means for changing the charge amount, as described in JP-A-11-86735, it has been proposed to laminate a film for changing the polarity on the phosphor layer. However, there has been a problem that an increase in the process or a decrease in luminance is caused by laminating films with non-light emitting materials.
[0008]
Further, as a green phosphor excited and emitted by ultraviolet light, there is a manganese activated barium aluminate BaAl 12 O 19 : Mn phosphor. The surface potential of this phosphor has a positive polarity and discharge is stable. However, this phosphor has a low luminance and is greatly deteriorated with time during panel operation, and is not suitable for practical use.
[0009]
Other green phosphors include terbium activated yttrium borate YBO 3 : Tb phosphors. Although the surface potential of this phosphor has a positive polarity, it has a color purity with respect to copper and gold-activated zinc sulfide phosphor ZnS: Cu, Au (JEDEC registration number P-22) used in the current CRT. Since the color reproduction range is narrow, the display quality is inferior.
[0010]
The present invention has been made in order to solve such problems, and is a plasma display which stabilizes discharge characteristics, achieves high luminance and long life, and has a color purity equal to or higher than that of a CRT. An object is to provide an apparatus.
[0011]
[Means for Solving the Problems]
The present inventors use a mixed phosphor obtained by mixing a phosphor having a negative surface potential and a phosphor having a positive polarity on the phosphor screen, thereby further reducing the luminance without increasing the number of steps. It was found that the discharge can be stabilized without any problems.
[0012]
Therefore, in order to solve the above-mentioned problems, the plasma display device of the present invention is a mixed fluorescence obtained by mixing at least one color phosphor layer with a phosphor having a negative surface potential and a phosphor having a positive polarity. The fluorescent screen using the body is provided.
[0013]
With this configuration, the polarity of the surface potential of the phosphor having a negative surface potential can be changed in the positive direction, and discharge variations or discharge errors in the plasma display device can be reduced, and stable image display can be achieved. Can be done.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, at least one of the pair of substrates transparent at least on the front side is arranged to face each other so that a discharge space is formed between the substrates, and at least one partition wall for partitioning the discharge space into a plurality is provided. A plasma having a panel body provided with red, green and blue phosphor layers arranged on a substrate and arranged with an electrode group on the substrate so that a discharge is generated in a discharge space partitioned by the partition walls, and emitting light by discharge. In the display device, the red and blue phosphor layers have a positive surface potential, and the green phosphor layer is represented by the general formula Zn 2 SiO 4 : Mn and has a negative surface potential with manganese. and an active zinc silicate green phosphor, the general formula ReBO 3: Tb (Re is a rare earth element: represents an Sc, Y, La kind, selected Ce, from Gd or more solid solution) Represented in which the surface potential using a mixed phosphor obtained by mixing a terbium activated rare earth borate green phosphor having a positive polarity.
[0017]
Furthermore, in the above configuration, it is desirable that the mixing ratio of the terbium-activated rare earth borate green phosphor with respect to the total composition of the mixed phosphor is in the range of 10 to 75% by weight.
[0018]
Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS.
[0019]
FIG. 1 shows an example of a panel structure in a plasma display device according to an embodiment of the present invention, FIG. 2 shows a cross section taken along line AA ′ of FIG. 1, and FIG. 3 shows BB ′ of FIG. A cross section cut by a line is shown. As shown in the figure, a plurality of pairs of stripe-like display electrodes 4 that are paired with a scanning electrode 2 and a sustaining electrode 3 are formed on a transparent front substrate 1 such as a glass substrate. A light shielding layer 5 is disposed between adjacent display electrodes 4. The scan electrode 2 and the sustain electrode 3 are respectively composed of transparent electrodes 2a and 3a and buses 2b and 3b made of silver or the like electrically connected to the transparent electrodes 2a and 3a. A dielectric layer 6 is formed on the front substrate 1 so as to cover the plurality of pairs of electrodes, and a protective film 7 is formed on the dielectric layer 6.
[0020]
A plurality of stripes covered with an insulating layer 9 are arranged on the back substrate 8 facing the front substrate 1 in a direction perpendicular to the display electrodes 4 of the scan electrodes 2 and the sustain electrodes 3. A data electrode 10 is formed. On the insulator layer 9 between the data electrodes 10, a plurality of stripe-shaped partition walls 11 are arranged in parallel with the data electrode 10, and the phosphor layer 12 is formed on the side surface 11 a between the partition walls 11 and the surface of the insulator layer 9. Is provided.
[0021]
The substrate 1 and the substrate 8 are arranged to face each other with a minute discharge space so that the scan electrode 2 and the sustain electrode 3 and the data electrode 10 are orthogonal to each other, and the periphery is sealed, and the discharge One or a mixed gas of helium, neon, argon, and xenon is sealed in the space as a discharge gas. In addition, the discharge space is divided into a plurality of sections by partition walls 11 to provide a plurality of discharge cells 13 at which the intersections of the display electrodes 4 and the data electrodes 10 are located. The phosphor layers 12 are sequentially arranged one by one so as to be blue.
[0022]
Next, the operation of the panel body will be described. As shown in FIG. 4, the electrode arrangement of the panel body has a matrix configuration composed of discharge cells of M rows × N columns, and M rows are scanned in the row direction. Electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM are arranged, and N columns of data electrodes D1 to DN are arranged in the column direction.
[0023]
FIG. 5 shows an example of a timing chart of a driving method of an AC type plasma display device using this panel body.
[0024]
As shown in FIGS. 4 and 5, in the writing period, after all sustain electrodes SUS <b> 1 to SUSM are held at 0 (V), predetermined data electrodes D <b> 1 to DN corresponding to the discharge cells to be displayed in the first row are displayed. When a positive write pulse voltage + Vw (V) and a negative scan pulse voltage -Vs (V) are respectively applied to the first row scan electrode SCN1, the predetermined data electrodes D1 to DN and the first row Write discharge occurs at the intersection with the scan electrode SCN1.
[0025]
Next, positive write pulse voltage + Vw (V) is applied to predetermined data electrodes D1 to DN corresponding to discharge cells to be displayed in the second row, and negative scan pulse voltage -Vs is applied to scan electrode SCN2 in the second row. When (V) is applied to each, an address discharge occurs at the intersection of predetermined data electrodes D1 to DN and scan electrode SCN2 in the second row.
[0026]
The same operation as described above is sequentially performed. Finally, a positive write pulse voltage + Vw (V) is applied to predetermined data electrodes D1 to DN corresponding to discharge cells to be displayed in the Mth row, and the Mth row is scanned. When a negative scan pulse voltage −Vs (V) is applied to each electrode SCNM, an address discharge occurs at the intersection of predetermined data electrodes D1 to DN and the Mth scan electrode SCNM.
[0027]
In the next sustain period, all the scan electrodes SCN1 to SCNM are temporarily held at 0 (V), and when a negative sustain pulse voltage −Vm (V) is applied to all the sustain electrodes SUS1 to SUSM, an address discharge is caused. In addition, a sustain discharge occurs between scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM at the intersections. Next, by applying negative sustain pulse voltage −Vm (V) alternately to all scan electrodes SCN1 to SCNM and all sustain electrodes SUS1 to SUSM, sustain discharge continuously occurs in the display discharge cells. Panel display is performed by the light emission of the sustain discharge.
[0028]
In the next erasing period, all the scan electrodes SCN1 to SCNM are temporarily held at 0 (V), and when the erasing pulse voltage −Ve (V) is applied to all the sustain electrodes SUS1 to SUSM, an erasing discharge is caused to cause a discharge. Stops.
[0029]
Through the above operation, one screen is displayed in the AC type plasma display apparatus.
[0030]
Here, the plasma display device of the present invention uses a mixed phosphor in which phosphors having different surface potential polarities are mixed. In other words, by mixing a phosphor having a negative surface potential with a phosphor having a positive surface potential, the polarity of the surface potential of the phosphor having a negative surface potential is positive. To change.
[0031]
As described above, the charge amount of the phosphor generally used in the plasma display apparatus is negative only for the green phosphor Zn 2 SiO 4 : Mn, and the red phosphor (Y, Gd) BO 3 : Eu and the blue phosphor BaMgAl 10 O 17 : Eu have positive polarity. On the other hand, YBO 3 : Tb, which is a green phosphor, also has a positive polarity. Therefore, YBO 3: by creating a mixed phosphor using Tb, YBO 3: charge amount in accordance with the mixing ratio increases in Tb is changing from negative to positive direction can be predicted. However, by using a mixed phosphor, deterioration of color purity or the like is predicted, and it is not a matter of simply mixing.
[0032]
FIG. 6 shows the relationship between the mixing ratio of YBO 3 : Tb to Zn 2 SiO 4 : Mn and the chromaticity change. Here, the mixing ratio represents a ratio to the total composition of the mixed phosphor. If the mixing ratio of YBO 3 : Tb is less than 75% by weight, the color is more than the chromaticity (x = 0.310, y = 0.595) of the P22 phosphor ZnS: Cu, Au used in the CRT. It can be seen that the purity is excellent.
[0033]
Thus, the present invention makes it possible to obtain a stable discharge characteristic by changing the surface potential to positive polarity while ensuring a satisfactory level of color purity.
[0034]
Next, an example of a method for forming the phosphor layer will be described. The phosphor layer can be formed by a generally used screen printing method, and FIG. 7 shows an outline of the case where it is formed by the screen printing method. In FIG. 7, the electrodes and the like are omitted.
[0035]
First, as shown in FIG. 7A, a mesh screen on which a pattern 14a is formed or a mask 14 such as a metal mask is set on a substrate on the back side on which a partition wall is formed. The body paste 15 is dropped and attached to the partition wall by the squeegee 16. The phosphor paste 15 is made of a mixture of phosphor and vehicle, and the blending ratio varies depending on the phosphor particle size, screen type, and resin type. As the resin, ethyl cellulose or acrylic resin is generally used. As the solvent, terpineol and BCA (butyl carbitol acetate) are generally used. This time, we selected ethyl cellulose as the resin and terpineol as the solvent.
[0036]
FIGS. 7B to 7E schematically show how the phosphor paste 15 is filled in the partition walls. That is, first, as shown in FIG. 7B, the phosphor paste 15 discharged from the mask 14 is transferred to the side face of the partition wall 18 provided on the substrate 17, and then the phosphor paste as shown in FIG. 7C. The side of the partition 18 is lowered by its own weight of 15. Thereafter, the phosphor paste 15 is made uniform by its own weight and surface tension as shown in FIG. 7D, and finally formed into a predetermined shape with a balanced surface tension as shown in FIG. 7E. It will be.
[0037]
The method for forming the phosphor layer is not limited to the screen printing method described above, and may be an ink jet method, a spray method, a transfer method, or the like.
[0038]
【Example】
Specific examples of the present invention will be described below.
[0039]
Example 1
Zn 2 SiO 4 : Mn and YBO 3 : Tb are selected as green phosphors, and a plasma display device is produced using a mixed phosphor in which YBO 3 : Tb is mixed at 50% by weight of the total composition as a green component. did. Table 1 shows the light emission characteristics of each phosphor used in the mixed phosphor of this example.
[0040]
[Table 1]
[0041]
For comparison, a plasma display device of a conventional example was made at the same time except that the phosphor material was common and Zn 2 SiO 4 : Mn was a green component. Table 2 shows the light emission characteristics of the plasma display device of the present invention and the conventional example.
[0042]
[Table 2]
[0043]
The following formula is generally used for evaluating the stability of discharge.
[0044]
Nt / N0 = exp (− (t−tf) / ts)
In this equation, Nt is the number of times that no discharge has occurred at time t (discharge failure), N0 is the number of times of measurement of the discharge delay time, tf is the formation delay, and ts is the discharge variation. In this example, the stability of discharge was evaluated by the number of discharge misses Nt and the discharge variation ts.
[0045]
It can be said that as the value of ts, which is a parameter representing discharge variation, is smaller, the discharge variation is smaller. The large discharge variation means that the discharge does not start in a certain time with respect to the input, and the display quality is remarkably deteriorated. For evaluation of the discharge error, the number Nt of discharges (discharge errors) was counted for 100 pulse inputs. For evaluation of the discharge variation ts, ts in the formulas were relatively compared.
[0046]
When the discharge characteristics of the plasma display device of this example are evaluated, it can be seen from the above table that the discharge error can be reduced by about 90% and the discharge variation can be reduced by 90% compared to the conventional example. The same effect can be obtained by using not only the YBO 3 ; Tb phosphor but also a phosphor having a positive surface potential.
[0047]
The emission color of the phosphor of this example is x = 0.293 and y = 0.632 in CIE chromaticity coordinates (x / y), and x = 0.310 of the P-22 phosphor used in the CRT. It can be seen that the color purity is superior to y = 0.595.
[0048]
(Example 2)
Zn 2 SiO 4 : Mn and YBO 3 : Tb were selected as green phosphors, and mixed phosphors were prepared by changing the mixing ratio of YBO 3 : Tb. The mixed phosphor was applied to the plasma display device described above, and the discharge error and discharge variation at that time were examined. FIG. 8 shows the relationship between the mixing ratio (% by weight) of YBO 3 : Tb, discharge error, and variation. The mixing ratio is the ratio of YBO 3 : Tb with respect to the total composition.
[0049]
As can be seen from FIG. 8, when the mixing amount of YBO 3 : Tb is increased, discharge mistakes and discharge variations are reduced, and the stability of discharge is increased. In particular, the effect becomes remarkable when the mixing ratio of the phosphor having positive polarity is 10% by weight, and the effect converges when the mixing ratio exceeds 10% by weight. Therefore, the display quality can be sufficiently improved by setting the mixing ratio to 10% by weight or more. However, when YBO 3 : Tb is used, the color purity is inferior to that of CRT at 75% by weight or more as shown in FIG. 6, so the mixing ratio of YBO 3 : Tb is preferably 75% by weight or less.
[0050]
Example 3
As conventional examples, Zn 2 SiO 4 : Mn green phosphor and BaAl 12 O 19 : Mn green phosphor were prepared. As an example of the present invention, a mixed phosphor in which YBO 3 : Tb was mixed with Zn 2 SiO 4 : Mn so as to be 50% by weight of the total composition was prepared. Plasma display devices were prepared using each of these phosphors as a green component. The materials and processes other than the phosphor were the same. A life test was conducted on these plasma display devices, and the deterioration over time of the phosphors was examined. Table 3 shows the life characteristics. The numerical values in the table represent relative luminance when the initial operation luminance of Zn 2 SiO 4 : Mn is 100. However, the numerical value in parentheses is the deterioration rate.
[0051]
[Table 3]
[0052]
As is apparent from Table 3, the plasma display device using the phosphor of the embodiment of the present invention has a higher initial luminance than the plasma display device using the phosphor of the conventional example, and the luminance after 6000 hours of operation. Is also expensive.
[0053]
【The invention's effect】
As described above, according to the present invention, by applying the mixed green phosphor to the plasma display device, a stable discharge state can be obtained, and a plasma display device with high brightness and long life can be obtained. Further, the green color purity can be secured at the same level as the CRT.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a panel structure of a plasma display device according to an embodiment of the present invention with a part cut away. FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. FIG. 4 is an explanatory view showing an electrode arrangement of a panel body of the plasma display device. FIG. 5 is a signal waveform diagram showing an example of a driving method of the plasma display device. 6 is a characteristic diagram showing the chromaticity of the mixed phosphor and the phosphor for CRT (P-22) on the CIE chromaticity coordinates in the plasma display device according to one embodiment of the present invention. FIG. 8E is a schematic diagram for explaining a method for forming a phosphor layer in the plasma display device of the present invention. FIG. 8 is a schematic view of a plasma display device according to an embodiment of the present invention. YBO 3 for Zn 2 SiO 4 : Mn: Tb FIG. 9 is a sectional view showing an example of the structure of a conventional plasma display device. FIG. 10 is a characteristic diagram showing blow-off charge amounts of various phosphors. ]
1, 8 Substrate 2 Scan electrode 3 Sustain electrode 4 Display electrode 10 Data electrode 11 Partition 12 Phosphor layer 13 Discharge cell

Claims (2)

  1. At least a pair of substrates transparent at least on the front side are disposed opposite to each other so that a discharge space is formed between the substrates, and a partition for partitioning the discharge space into a plurality is disposed on at least one substrate, and is partitioned by the partition In a plasma display device having a panel body in which an electrode group is arranged on a substrate so as to generate discharge in a discharge space, and a red, green and blue phosphor layer emitting light by discharge is provided, the red and blue phosphor layers Has a positive electrode surface potential, and the green phosphor layer is represented by the general formula Zn 2 SiO 4 : Mn, and the manganese-activated zinc silicate green phosphor having a negative surface potential and the general formula ReBO 3: Tb (Re is a rare earth element: Sc, Y, La, Ce, one selected from Gd or represents a plurality of kinds of solid solution) is represented surface potential having a positive polarity A plasma display device using a mixed phosphor obtained by mixing the Rubiumu activated rare earth borate green phosphor.
  2. The plasma display device according to claim 2, wherein the mixing ratio of the terbium-activated rare earth borate green phosphor to the total composition of the mixed phosphor is in the range of 10 to 75 wt% .
JP2000292069A 1999-12-14 2000-09-26 Plasma display device Expired - Fee Related JP3797084B2 (en)

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Application Number Priority Date Filing Date Title
JP35467999 1999-12-14
JP11-354679 1999-12-14
JP2000292069A JP3797084B2 (en) 1999-12-14 2000-09-26 Plasma display device

Applications Claiming Priority (1)

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DE10061720A1 (en) * 2000-12-12 2002-06-13 Philips Corp Intellectual Pty Plasma screen comprises front plate, carrier plate with phosphor layer, rib structure which divides chamber between front plate and carrier plate into plasma cells which are filled with gas, and electrode arrays
JP2003183650A (en) 2001-12-25 2003-07-03 Matsushita Electric Ind Co Ltd Method for producing plasma display apparatus
FR2846145A1 (en) * 2002-10-17 2004-04-23 Thomson Plasma Green luminophore plasma visualization panel comprising a mixture of spinel structure aluminates
JP4207644B2 (en) 2003-04-22 2009-01-14 パナソニック株式会社 Method for manufacturing phosphor for plasma display device
KR100560510B1 (en) 2003-06-10 2006-03-14 삼성에스디아이 주식회사 Plasma display device
JP4244727B2 (en) 2003-06-30 2009-03-25 パナソニック株式会社 Plasma display device
JP4244726B2 (en) 2003-06-30 2009-03-25 パナソニック株式会社 Plasma display device
JP4415578B2 (en) 2003-06-30 2010-02-17 パナソニック株式会社 Plasma display device
KR100651277B1 (en) * 2003-07-25 2006-11-28 엘지전자 주식회사 Green phosphor and plasma display panel
JP2005100890A (en) 2003-09-26 2005-04-14 Matsushita Electric Ind Co Ltd Plasma display device
JP4449389B2 (en) 2003-09-26 2010-04-14 パナソニック株式会社 Method for manufacturing phosphor for plasma display device
AU2003304505A1 (en) 2003-10-21 2005-05-05 Sumitomo Chemical Company, Limited Fluorescent material and fluorescent material paste
JP2005148360A (en) * 2003-11-14 2005-06-09 Matsushita Electric Ind Co Ltd Plasma display device
JP4534563B2 (en) * 2004-04-13 2010-09-01 パナソニック株式会社 Plasma display panel and manufacturing method thereof
KR100918417B1 (en) 2004-05-28 2009-09-24 삼성에스디아이 주식회사 Plasma display panel
JP2007106778A (en) * 2004-09-03 2007-04-26 Konica Minolta Medical & Graphic Inc Phosphor and plasma display panel
CN101322213B (en) 2006-02-23 2011-05-18 松下电器产业株式会社 Plasma display device
CN100595861C (en) 2006-02-23 2010-03-24 松下电器产业株式会社 Plasma display device and method of manufacturing green phosphor material for plasma display device
JP2008303230A (en) * 2007-06-05 2008-12-18 Panasonic Corp Phosphor and manufacturing method therefor
KR20110057143A (en) * 2009-05-25 2011-05-31 파나소닉 주식회사 Fluorescent substance, process for producing same, and luminescent device
CN102473570A (en) 2010-05-07 2012-05-23 松下电器产业株式会社 A plasma display panel

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