JPH03205481A - Dc plasma display pannel - Google Patents

Abstract

PURPOSE:To improve the luminance by applying a Zn2SiO4:Mn, As phosphor containing a specified amount of As and for activation to a DC plasma display pannel. CONSTITUTION:A base phosphor (i) comprising Zn2SiO4 is activated with As (ii) in an amount below 0.003wt.% based on component (i) and Mn (iii) in an amount of 0.05-2.0wt.% based on component (i) to give a Zn2SiO4:Mn, As phosphor. This phosphor is applied to a DC plasma display pannel.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is a plasma display that emits light by exciting a phosphor coated on an anode with vacuum ultraviolet rays emitted by a gas discharge! For more information on Neuvanel (PDP), please visit
This invention relates to a DC plasma display panel coated with Zn2S i 04:Mn,As phosphor inside.

[Conventional technology and its problems] In recent years, flat display panels have been actively developed. Among them, DC type FDPs are superior in display capacity, display screen quality, response speed, gradation display, etc., are resistant to vibration and shock, are lightweight, and are suitable for large screens, so they are often used in laptop computers. It has been put into practical use.

A typical DC type PDP will be explained with reference to FIG. FIG. 1a is a perspective view of a structural model of a PDP display panel, which consists of two electrodes constituting an anode 1 and a cathode 2, arranged in a matrix on two glass plates, and each display dot 1. is formed. The anode electrodes on the three front glasses are formed by etching the deposited transparent conductive film, and the cathode electrodes on the back glass side 4 are formed by thick film printing. Further, a partition wall 5 is provided so that a wide viewing angle can be obtained by thick film printing, and each display dot is separated and independent. FIG. 1b is a diagram showing the cross-sectional structure of FIG. 1-a.
He, Xe-A. A mixed gas such as R is sealed in the anode L, and a phosphor 7 is applied to the anode L.

Most conventional PDPs have N in the discharge space of the PDP.
It is an orange monochrome type that is filled with a mixed gas such as e-Ar and utilizes light emission by glow discharge of Ne. On the other hand, phosphor is applied to the anode and emitted by Xe glow discharge1
Monochrome or multicolor PDPs that use 47 nm vacuum ultraviolet light to excite phosphors and utilize the resulting light emission are still in the prototype stage and have not yet been put into practical use.

However, green monochrome PDPs, which are now being put into practical use, are made by optimizing the Mn activation amount of Mn for conventional CRT and lamp phosphors. is coated with. The amount of Mn is also about 1.6% by weight based on the phosphor matrix, and the literature also states that Zn2s used for FDP
i O4: The optimum amount of Mn in the Mn phosphor is 0. 06
g a tm/m. o I is disclosed.

(J. Koike et. at.: J. EIect
orochem. Soc. , 126[6], 1008(
1.979)) This is expressed as the weight percent of Mn based on the phosphor matrix.
When converted to 1.5% by weight, it is approximately 1.5% by weight.

The brightness of conventional PDPs is expressed in terms of brightness per unit light emitting surface (point brightness), and in the case of the former orange monochrome PDP, it is 80 cd/
rn2, the latter green monochrome PDP is 110 cd/m2, both of which are within the practical range, but compared to backlit LCD displays, the brightness in terms of power consumption ratio is not necessarily high, and in order to reduce heat loss, the brightness must be further increased. A PDP using a green phosphor with high brightness is strongly desired.

Therefore, in view of the above circumstances, the present invention is intended to provide a brighter PDP than the conventional one by optimally using a higher luminance phosphor for the green component of the PDP.

[Means for solving the problem Z n2s i 04: Mn, A s phosphor is C
It is known as P39, a green-emitting phosphor for RT, and is mainly used as a green-emitting phosphor for computer displays that require afterglow properties. Similarly, the above Z n
2s i O,l: Mn phosphor (P1) is also used, but P39 has a lower brightness than P1 but has a longer afterglow, so P39 has been used exclusively. However, the present inventor found that by optimizing the As activation amount of P39 phosphor for PDP, which was considered to have low brightness by those skilled in the art, the brightness was higher than that of conventional PDP with P1 optimized. This new discovery led to the present invention.

First, in order to investigate the relationship between the As concentration and the emission brightness of the phosphor, a large number of ZnpSiO4:Mn,As phosphors were prepared in which the amount of ASo activation was varied from that of the phosphor matrix (Z n2s i 04). The Mn activation amount was kept constant at 0.13% by weight, which is often applied to conventional P39 phosphors. Since the relative brightness of the P39 phosphor powder does not change when excited with an electron beam or when excited with 253.7 nm,
The relative brightness of these phosphor powders when excited at a simple wavelength of 253.7 nm is 10.
It is shown in FIG. 2-a as 0%.

Further, the phosphor was mounted on an FDP to cause it to emit light, and its point brightness was measured. The results are shown in Figure 2-b.

As can be seen from these results, in the case of 253.7 nm excitation, the relative brightness decreases as the amount of AsO activation increases, but when the phosphor is mounted on a PDP, the Xe
In the case of 147 nm excitation, there is a peak in point brightness with respect to the amount of As activation, and it can be seen that the brightness clearly increased due to the activation of As. Moreover, for those skilled in the art who believed that activating As would reduce the brightness, activating only 0.002% by weight was enough to reduce the brightness by 40%.
We obtained an unexpected result in which an increase in brightness was observed.

Next, as mentioned above, it is known that activating As in the Z n2s i 04:Mn phosphor increases the afterglow time. Similarly, in the case of PDP, an appropriate afterglow is required depending on the application, and the 10% afterglow time is usually 5 Om.
S or less is appropriate. Therefore, the phosphor made by activating As must have an afterglow time that can be applied to PDPs.

Therefore, FIG. 3 shows the results of examining the afterglow time when the phosphor was mounted on an FDP.

As the activation amount of As increases, the afterglow time increases linearly, but the activation amount of As, which is in the practical range, is 0.0.
It can be seen that the amount is less than 0.03% by weight.

These results show that the activation amount of As is 0.0 with respect to the phosphor matrix.
Zn2 adjusted to a range of 0005 to 0.003% by weight
It is more preferable to use SiO4:Mn,As phosphor for FDP.

Note that the Mn activation amount of the Z n2s i Oa: Mn, As phosphor is generally 0.05 to 2 with respect to the matrix.
．． Although Mn was activated in the range of 0% by weight, the effect of the activation amount of As on the phosphor activated in this range is almost the same as the results shown in Figure 2-b1 and Figure 3. there were.

[Function] As mentioned above, the FDP of the present invention has a brightness higher than the conventional PDP by setting the As activation amount of the Zn2S j 04:Mn,As phosphor used as the green component to an optimum value.
The FDP became brighter than 0%.

[Example 1] The Mn activation amount and the As activation amount were each 0 relative to the phosphor matrix.
．． Zn2s i which is 5 wt%, 0.002 wt%
04: 90 g of Mn, 160 g of a 12.5% by weight PVA aqueous solution, 1 ml of octanol, and 3 ml of a 20% ammonium dichromate aqueous solution were mixed to form a phosphor slurry. The slurry was then applied to the anode in a film thickness of 15 μm using a roll coating method.

Next, after firing the binder, the panel was sealed and He99
%, Xel% was sealed, and after getter flash with Hg, Hg was diffused to obtain a PDP of the present invention. As a comparative example, Zn2s activated with only 1.6% by weight of Mn
iO4: PD in the same manner using 90g of Mn phosphor
P was produced.

When those PDPs were turned on and their point luminance was measured, the PDP of the present invention had a luminance of 140 cd/m2, and that of the conventional PDP had a luminance of 110 cd/rn2.

[Example 2] The Mn activation amount and the As activation amount were each 1 for the phosphor matrix.
．． Zn2s i which is 0 wt%, 0.001 wt%
Oa: A phosphor slurry was formed using 90 g of Mn in the same manner as in Example 1. The slurry was then applied to the anode of the panel to a thickness of 15 μm.

The rest was carried out in the same manner as in Example 1 to obtain an FDP of the present invention.

When I measured the brightness of this PDPo point, it was 130cd/
It was m2.

[Effects of the invention] The phosphor used in the PDP of the present invention has the same composition as the conventional P39 phosphor, but the P39 phosphor has an AsO activation amount of 0.003% by weight or less based on the base material for practical use. However, the present invention could not be accomplished by simply applying the conventional P39 to the FDP. Therefore, the present invention has brought about a hitherto unimaginable effect of improving brightness by optimizing the amount of As activation of the P39 phosphor, which was believed to reduce brightness by activating AS.

Further, even when the phosphor used in the present invention is used not only in a green monochrome PDP but also in a multicolor PDP, the brightness of the white component is improved, resulting in a brighter FDP.

[Brief explanation of drawings]

1a and 1-b are respectively a perspective view and a cross-sectional view of a structural model of a display panel of a typical DC plasma display, and FIG.
2S i O4: A diagram showing the relationship between As activation amount and relative brightness of Mn, As phosphor, Figure 2-b is also the same < Z n2
s i 04: Diagram showing the relationship between As activation amount and point brightness of Mn, As phosphor, Figure 3 is also the same < Zn2S
i04: A diagram showing the relationship between As activation amount and afterglow time of Mn,As phosphor. DESCRIPTION OF SYMBOLS 1... Anode, 2... Cathode, 3... Front glass, 4... Back glass, 5... Partition wall, 6... Discharge space, 7... Phosphor.

Claims (1)

[Claims] Zn activated with As in a range from 0 to 0.003% by weight based on the phosphor matrix (Zn_2SiO_4)
_2SiO_4: A DC plasma display panel coated with Mn, As phosphor.