JPH04264329A - Plasma display panel - Google Patents

Abstract

PURPOSE:To improve brightness, chromaticity and contrast ratio by preventing interference of fluorescent substances in themselves in a monochromatic plasma display to emit a prescribed color. CONSTITUTION:Plural number of fluorescent substance layers 7-9 having respectively different luminescent colors are arranged in one discharge cell on a transparent anode 3 arranged on a front glass substrate 5 on a plasma display panel, and color filter 10-12 to transmit colors emitted by these fluorescent substance layers are arranged in positions corresponding to these fluorescent substance layers between the front glass substrate 5 and the fluorescent substance layers 7-9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter referred to as PDP), and more particularly to a monochrome plasma display panel having phosphor layers of multiple colors.

0002

2 and 3 are cross-sectional views for explaining the structure of a conventional monochromatic PDP. First, an orange PDP using Ne gas color development will be described with reference to FIG. First, the cathode 2 is formed on the back glass substrate 1 using a thick film printing method. The material of the cathode 2 is, for example, a Ni thick film (manufactured by Dupont Co., Ltd. #9535, dried at 120°C for 1 hour,
A stripe pattern is arbitrarily formed using a peak holding time of 10 minutes at 80°C. Next, in order to maintain the gap between the cathodes 2 and 3, barrier ribs 4 are placed perpendicularly to the cathodes 2.
form. For example, the material of the barrier rib 4 is (Du
Dry (120°C 10°C) using
160~200μ by repeating the printing process several times)
Lay them up to a thickness of about m. Thereafter, firing is performed (580° C. peak holding time 10 minutes) to form barrier ribs 4. On the other hand, a transparent conductive film (ITO) is placed on the front glass substrate 5 as an anode 3.
: Indium Tin Oxide) is formed into a film using vapor deposition or sputtering, and then patterned into an arbitrary shape using photolithography. These front glass substrate 1 and rear glass substrate 5 are aligned so that the cathode 2 and anode 3 are facing each other and perpendicular to each other, and the outer periphery of the glass is coated with lead glass paste (powdered glass #IWF75 manufactured by Iwaki Glass Co., Ltd.).
75B (250 g) + ethyl cellulose (1 g) + isoamyl acetate (19 g)] and heated while exhausting from an exhaust pipe (not shown) (460°C peak retention time 20 minutes).
Then, the lead glass is melted and sealed. Vacuum degree is 10-
After reaching 5 to 10-7 torr, a Penning mixed gas of Ne and some Ar is filled into the panel to complete the panel. In this case, a display panel is created by utilizing the color development (orange color) caused by the discharge D of Ne+Ar gas. Next, the structure of a monochromatic panel using the color development of the phosphor layer 6 will be explained with reference to FIG. This is a phosphor layer 6 (conductive phosphor paste: 10 g of phosphor powder mixed with 5 g of indium oxide powder and 15 to 25 g of viscosity adjusting vehicle) on the anode 3 of the front glass substrate 5 of the first conventional example. Dry at 150℃ for 1 hour
The phosphor layer 6 is formed by firing at 460° C. for a peak holding time of 10 minutes) and is formed by thick film printing or the like. In addition, a Penning mixture gas of He and some Xe or Kr is used as the gas sealed in the panel, and the phosphor layer 6 is excited with ultraviolet rays generated by the discharge D to obtain a desired luminescent color. As the phosphor powder, phosphor manufactured by Kasei Optonics (#PIGI: green, KX502A: red, KX501A: blue) was used. Here, arbitrary phosphors are mixed and used to achieve a desired emission color. For example, to obtain white color, R (red), G (green), and B (blue) phosphors are mixed in a predetermined ratio, and to obtain yellow color, R and G phosphors are mixed in a predetermined ratio. Then, a phosphor layer 6 is formed.

0003

[Problems to be Solved by the Invention] However, in panels that use the coloring of phosphors having the above configuration, especially panels that have colors other than R, G, and B (three primary colors), since the phosphors are used as a mixture, it is difficult to The luminescent properties of the phosphors interfere with each other and are significantly impaired, resulting in insufficient brightness and chromaticity for practical use.

[0004] Furthermore, if the mixing ratio deviates even slightly, the overall chromaticity may deviate considerably, which may cause problems in reproducibility, that is, in mass production. In addition, in the case of mixed phosphors, all predetermined wavelengths are emitted from the light emitting area, making it impossible to use color filters, which poses a problem in that it becomes a major hindrance to improving the contrast ratio.

[0005]

[Means for Solving the Problems] In order to solve the problem that brightness, chromaticity, and contrast ratio are impaired when the above-mentioned phosphors are mixed and used, the present invention has been made to A transparent second electrode provided (
a color filter that selectively transmits the colors emitted by these phosphor layers between the front plate and the plurality of phosphor layers; are provided at corresponding positions on these phosphor layers.

[0006]

[Operation] As described above, according to the present invention, in order to obtain an arbitrary emission color in a single-color PDP, a plurality of phosphors each having a different emission color can be used without mixing a plurality of phosphors each having a different emission color. By providing the body layers independently in the same discharge cell, mutual interference of the phosphors themselves due to mixing can be prevented, and a PDP with improved brightness and chromaticity can be obtained with good reproducibility. By providing color filters corresponding to the emission colors of the layers at corresponding positions, the contrast ratio can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 4 to 6 are structural sectional views of a PDP for explaining embodiments of the present invention. First, a monochromatic PDP that emits white light will be explained using FIG. The same parts as in the conventional example are given the same reference numerals to simplify the explanation. First, the rear glass substrate 1 side is the same as the conventional example. Using a thick film printing method on the back glass substrate 1, Ni
The cathode 2 is formed in any shape. Next, barrier ribs 4 are laminated thereon to a height of 160 to 200 .mu.m by repeating thick film printing many times so as to be perpendicular to the cathode 2.

Next, the front glass substrate 5 side will be explained. First, ITO or the like is deposited as an anode 3 on the front glass substrate 5 by vapor deposition or sputtering, and then patterned into an arbitrary shape using photolithography. The panel used in this example is 640 (horizontal) x 480 (vertical) dots 0.3
The pitch is 8 mm, and the effective display area is 12 inches. Anode 3
(ITO) is 0.38mm pitch, ITO width 0.27
Patterning was performed with a gap of 0.11 mm. On top of that, conductivity was imparted by the same method as in the conventional example. The phosphor layers 7, 8, and 9 were formed by a thick film printing method. R (red)
Phosphor layer 7, G (green) phosphor layer 8, B (blue) phosphor layer 9
0.09 mm (
90 μm) and formed three colors independently. Here, the phosphor layer 7,
8 and 9 The forming method is not particularly limited, and a transfer method or a photolithography method may be used. After drying and baking, the back glass substrate 1, the cathode 2, and the anode 3 were aligned so as to be perpendicular to each other, sealed in the same manner as in the conventional example, and Penning mixed gas of He-Xe was sealed at a predetermined pressure. Further, an example in which color filters 10 to 12 are used in combination with this embodiment will be explained using FIG. 4.

The rear glass substrate 1 side is the same as described above. First, color filters 10 to 12 that selectively transmit R, G, and B emission colors are formed on the front glass substrate 5 by a thick film printing method. R, G, B color filter 10-1
For example, the R color filter 10 mainly contains copper sulfate, alkali metal salts, etc., the G color filter 11 mainly contains chromium oxide and cobalt oxide, and the B color filter 12.
used a color filter for thick-film printing that had chromium oxide as its main component and contained cobalt-based pigments.

[0010] Then drying at 150°C for 10 minutes and baking at 580°C.
A peak retention time of 10 minutes was performed, and a color filter of 10 to 1
form 2. The color filters 10 to 12 are each formed with a width of 0.09 mm (90 μm), and are R, G,
The three colors B make one set, and the total width is 0.27 mm. Then, between the adjacent color filter groups (10 to 12) (corresponding to the gap between ITO on the panel), black stripes 13 are printed using a thick film paste containing black pigment at 580°C. Perform firing.

Further, as the color filters 10 to 12, organic filters used in liquid crystals may be used as they are, and in this case, there is no need to be particular about the method of forming the color filters 10 to 12.

Next, the color filter 10 formed above
12 is overcoated with a transparent glass layer 14 so that the color filters 10 to 12 are not immersed in the etchant in the subsequent ITO etching process. This is ITO with a visible light transmittance of at least 80% or more.
It is necessary to choose a material that is highly acid and alkali resistant and will not be immersed in the forming etchant. In this example, ND-037 manufactured by Nissan Ferro Electronics Co., Ltd. was used. Print solidly on the color filters 10 to 12 so as to cover all the color filters 10 to 12, dry and bake at 150° C. for 10 minutes 58
A 0°C peak holding time of 10 minutes is performed.

Next, regarding the formation of ITO as the anode 3, a film is formed by vapor deposition, sputtering, etc., and an ITO pattern is formed directly above the R, G, and B color filters 10 to 12 formed thereon. Perform etching so that the That is, a gap between ITO is formed on the black stripe 13.

Next, phosphor layers 7, 8, and 9 are formed in the same manner as described above. At this time, on the ITO pattern, an R phosphor layer 7 is placed on the R color filter 10, a G phosphor layer 8 is placed on the G color filter 11, and a B phosphor layer 9 is placed on the B color filter 12. Let it form. The following is the same as the above embodiment.

As a second embodiment, a method for forming colors other than white will be described with reference to FIG. For example, in order to obtain a yellow luminescent color, an R phosphor layer 7, a G phosphor layer 8, or an R color filter and a G color filter (not shown) may be formed on the formed anode 3 in the same manner as described above. In this case, the dimensions of each of the R and G phosphor layers 7 and 8 are 0.27
It is sufficient that mm/2=0.135 mm. Furthermore, even if the color is the same yellow, in order to obtain a reddish yellow, that is, an orange color, the proportion of the R phosphor layer 7 on the anode 3 should be increased as shown in FIG. Also, the first
In the embodiment described above, if it is desired to obtain a bluish white or a greenish white, the occupation rate of blue or green may be made larger than that of the other two colors. A similar method enables color reproduction of all chromaticities.

The effects of the embodiments of the present invention will be explained below using Table 1 in comparison with white light emission obtained by mixing conventional R, G, and B phosphors. Table 1 shows a discharge cell pitch of 0.38 mm, an effective display area of 12 inches, and a discharge voltage of 24 mm.
A PDP with 0V and 640×480 dots is shown. As can be seen from Table 1, compared to the conventional PDP, the PDP according to the embodiment of the present invention has improved brightness and contrast ratio. In addition, in the embodiment of the present invention, a PDP provided with a color filter is a PDP provided with a color filter.
It can be seen that although the brightness is slightly inferior compared to DP, the contrast ratio under fluorescent lighting is considerably improved.

[0017]

[Table 1]

[0018]

[Effects of the Invention] As explained in detail above, according to the present invention, in order to obtain an arbitrary emission color in a PDP, a plurality of phosphor layers each having a different emission color can be independently provided in the same discharge cell. As a result, it was possible to prevent interference from the phosphor itself, and it was possible to obtain practically sufficient values for both brightness and chromaticity. Further, by using a color filter corresponding to the emission color of the phosphor layer used in the corresponding position of the phosphor layer, the contrast ratio was also significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a PDP for explaining an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a conventional PDP.

FIG. 3 is a sectional view of a PDP for explaining another conventional example.

FIG. 4 is a partial cross-sectional view of a PDP for explaining an embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a PDP for explaining an embodiment of the present invention.

FIG. 6 is a partial cross-sectional view of a PDP for explaining an embodiment of the present invention.

[Explanation of symbols]

1　　　　Back glass substrate 2 Cathode 3 Anode 4 Barrier ribs 5 Front glass substrate 7 R phosphor layer 8 G phosphor layer 9 B phosphor layer 10 R color filter 11 G color filter 12 B color filter 13 Black stripe 14 Transparent glass layer

Claims (2)

[Claims] 1. A back plate, a first electrode provided on the back plate, a transparent front plate disposed opposite to the first electrode side of the back plate, and a transparent front plate provided on the front plate. a transparent second electrode, a plurality of phosphor layers provided on the second electrode and emitting light of different colors, and the first electrode and the second electrode.
1. A plasma display panel comprising a discharge gas sealed between an electrode and a discharge gas. 2. A color filter that transmits colors emitted by these phosphor layers is provided between the front plate and the plurality of phosphor layers at corresponding positions of the phosphor layers. Item 1. The plasma display panel according to item 1.