JP4174902B2 - Front plate for plasma display panel, plasma display panel, and glass paste for forming dielectric layer of front plate for plasma display panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display panel, and more particularly to a plasma display panel that prevents abnormal discharge of an AC plasma display panel and improves the reliability of the panel.
[0002]
[Prior art]
A plasma display panel (hereinafter abbreviated as PDP) has attracted attention as a display that can be used for thin and large televisions. In particular, the AC PDP has a simple structure and can be manufactured at low cost, and has an advantage of improving luminance and display quality. The AC system PDP is a display that uses wall charges generated on the surface of a dielectric layer by discharging between different scan electrodes. The address electrode is also involved in the discharge to determine the discharge position of the scan electrode.
[0003]
However, some of the wall charges generated due to voltage application during scanning and addressing remain as residual wall charges on the surface of the dielectric layer even after display. Discharge (also called accidental discharge) occurs. In order to prevent this abnormal discharge, Japanese Patent Laid-Open No. 10-64434 discloses that the surface resistivity of the back plate, that is, the base plate dielectric layer on the opposite side of the display is displayed, especially conductive fine particles are added. A method of suppressing abnormal discharge by lowering the temperature is disclosed.
[0004]
Although charge accumulation on the back plate can be eliminated by this method, it is also required to eliminate charge accumulation on the front plate, that is, the substrate on the display display side. In particular, when the dielectric layer is damaged due to abnormal discharge in the front plate, a display defect of the panel occurs. Therefore, in order to suppress abnormal discharge, it is necessary to control the degree of charge accumulation (ease of removal). In order to control charge accumulation on the front plate, it is conceivable to impart conductivity to the dielectric layer of the front plate. In addition, by providing conductivity to the dielectric layer, it can be expected that the electrostatic capacity is increased, and current control at the time of display is facilitated even when the dielectric layer is thickened to ensure a withstand voltage.
[0005]
However, the dielectric layer formed on the front plate of the PDP needs to transmit the emitted light generated by the discharge with a higher transmittance. Decreasing the transmittance leads to a decrease in luminance. When the above-described conventional technique is used for the front plate, there is a problem that the conductive fine particles absorb light or diffusely reflect, thereby reducing the transmittance and lowering the brightness of the display.
[0006]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a PDP that does not have this abnormal discharge and that does not decrease in luminance.
[0007]
[Means for Solving the Problems]
That is, the present invention is a front panel for a PDP having a dielectric layer 1 covering the electrode and the electrode on the substrate, the dielectric layer 1 comprises a glass component and conductive particles included in the dielectric layer 1 the average refractive index Nc of the average refractive index Ng and conductive fine particles of the glass component is a front panel for a PDP and satisfies the following formula (1).
−0.1 ≦ Nc−Ng ≦ 0.1 (1)
Further, the present invention is a PDP, the upper Symbol PDP front panel for the dielectric layer 2 is formed covering the address electrodes and the address electrodes on the substrate surface, for partitioning a discharge cell on its A PDP is characterized in that a rear plate on which a partition wall is formed is disposed oppositely, and the front plate is used as a substantial image display surface.
[0008]
The present invention also relates to a glass paste for forming a dielectric layer of a front panel for a plasma display panel mainly composed of glass powder and an organic binder, further comprising conductive fine particles, and an average refractive index Nc of the conductive fine particles. A glass paste for forming a dielectric layer of a front panel for a plasma display panel, wherein the average refractive index Ng of the glass powder contained in the paste has the above relationship (1).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
PDP member of the present invention, Ru is used as a front plate forming a abnormal discharge without and order to achieve the object of providing a PDP which does not decrease luminance, substantive image display surface.
[0010]
The procedure for producing the front plate for PDP of the present invention is shown below. However, the present invention is not limited to this.
[0011]
As the substrate, soda glass or a glass substrate for plasma display (PD200 manufactured by Asahi Glass Co., Ltd.) can be used. A scan electrode is formed on the substrate with ITO or the like, and a bus electrode is formed using silver in order to reduce the resistance value of the scan electrode.
[0012]
Next, a dielectric layer is formed so as to cover the bus electrode. In the PDP member of the present invention, the average refractive index Ng of the glass component contained in the dielectric layer and the average refractive index Nc of the conductive fine particles must satisfy the following formula (1). By satisfy | filling Formula (1), it becomes possible to suppress the light absorption and irregular reflection by the electroconductive particle in a dielectric material layer, and it can suppress abnormal discharge, maintaining a light transmittance.
−0.1 ≦ Nc−Ng ≦ 0.1 (1)
As the glass component, glass containing 10 to 80% by weight of lead oxide, bismuth oxide and phosphorus oxide in total can be used. By setting it to 10% by weight or more, the heat softening temperature becomes 350 to 580 ° C., and baking at 600 ° C. or less becomes easy, and by setting it to 80% by weight or less, crystallization is prevented and a decrease in transmittance is prevented. The refractive index of these glass components is preferably 1.70 to 1.85. By making it within this range, it becomes easy to make the refractive index close to that of the conductive fine particles.
[0013]
As the conductive fine particles, a metal having high transparency and a low resistance value or a metal oxide can be used. Specifically, tin oxide, ITO, and zinc antimonate are preferable. The content of the conductive fine particles in the dielectric layer is preferably about 0.1 to 10% by weight. By making the content 0.1% by weight or more, it is possible to effectively suppress abnormal discharge. Moreover, the insulation between electrodes can be maintained by setting it as 10 weight% or less.
[0014]
In order to suppress abnormal discharge, the volume resistivity of the dielectric layer is preferably 1 × 10 ⁵ to 1 × 10 ¹⁰ Ω · m. By setting the volume resistivity to 1 × 10 ¹³ Ω · m or less, the effect of suppressing abnormal discharge can be obtained. By setting it to 1 × 10 ⁵ Ω · m or more, the insulating properties of adjacent electrodes can be maintained.
[0015]
In order to obtain sufficient luminance, the visible light transmittance of the dielectric layer is preferably 70% or more.
[0016]
The dielectric layer of the PDP member of the present invention can be formed by applying a glass paste mainly composed of glass powder and an organic binder on a substrate and then baking at 400 to 600 ° C.
[0017]
The glass paste in the present invention contains conductive fine particles, and it is important that the average refractive index Nc of the conductive fine particles and the average refractive index Ng of the glass powder satisfy the above formula (1). By employing such a glass paste, the above-described dielectric layer can be obtained.
[0018]
The average particle diameter of the conductive fine particles in the glass paste is preferably 1 to 10 μm, more preferably 2 to 5 μm. Dispersion of the powder in a paste becomes easy by setting it as 1 micrometer or more, and a protrusion-shaped defect can be prevented by setting it as 10 micrometers or less.
[0019]
A glass paste can be produced by mixing and kneading the above glass component powder, conductive fine particles and an organic binder. As the organic binder to be used, cellulose compounds typified by ethyl cellulose, methyl cellulose and the like, acrylic compounds such as methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, methyl acrylate, ethyl acrylate and isobutyl acrylate can be used. Moreover, you may add additives, such as a solvent and a plasticizer, in glass paste. As the solvent, general-purpose solvents such as terpineol, butyrolactone, toluene and methyl cellosolve can be used. As the plasticizer, dibutyl phthalate, diethyl phthalate, or the like can be used.
[0020]
The thickness of the glass paste applied on the substrate is preferably 10 to 100 μm, and the thickness after firing is preferably about 5 to 80 μm. When the thickness after firing is 5 μm or more, defects such as pinholes are less likely to occur, and when it is 80 μm or less, there is no problem that the drive voltage increases.
[0021]
Next, a front substrate can be produced by forming a magnesium oxide layer.
[0022]
The back plate combined with the front plate of the present invention can be produced by forming address electrodes, dielectric layers, barrier ribs and phosphor layers on a substrate by a conventional method. At that time, it is preferable that conductive particles are also contained in the dielectric layer of the back plate.
[0023]
In the PDP of the present invention, it is important to use the above-described PDP member as a front plate. A PDP can be manufactured by sealing a front plate and a back plate, sealing He or Ne gas containing Xe, and mounting a drive circuit.
[0024]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to this. The concentration (%) in Examples and Comparative Examples is% by weight.
[0025]
(Example 1)
A glass containing 70% by weight of lead oxide containing 70% by weight of Ba borosilicate glass (refractive index 1.81), tin oxide (refractive index 1.83) 5%, ethylcellulose 15%, and terpineol 10%. A paste was obtained.
[0026]
A three-layer electrode film of 70 mm square chromium / copper / chromium was formed on a glass substrate PD200 manufactured by Asahi Glass Co., Ltd. by sputtering.
The above glass paste was applied to the electrode film by screen printing so as to have a thickness of 50 μm, and baked at 570 ° C. for 15 minutes to form a dielectric layer. The thickness after firing was 28 μm.
A doughite was applied on the dielectric layer to form a circular electrode film having a diameter of 40 mm.
When a voltage of 1 volt was applied between the upper and lower electrodes of the dielectric layer and the resistance value was measured with a high resistance meter, it was 7 × 10 ⁸ Ω. This resistance value was substituted into the following formula (2), and it was confirmed that the volume resistivity of the formed dielectric layer was 3 × 10 ¹⁰ Ω · m.
Volume resistivity (Ω · m) = resistance value (Ω) × πd ² / 4t (2)
Here, d (m) is the diameter of the electrode, and t (m) is the thickness of the dielectric.
[0027]
(Example 2)
Scan electrodes having a pitch of 220 μm and a line width of 100 μm were formed on a glass substrate PD200 manufactured by Asahi Glass Co., Ltd. using ITO. In addition, after applying a photosensitive silver paste on the substrate, a mask electrode through a photomask, development using a 0.3% sodium carbonate aqueous solution, and a baking process at 580 ° C. for 15 minutes, a bus electrode was formed. .
[0028]
Next, the glass paste obtained in Example 1 is applied by screen printing so as to have a thickness of 50 μm so as to cover the bus electrode of the display portion, and baked at 570 ° C. for 15 minutes to form a front dielectric. did. The thickness after firing was 28 μm. A front plate was produced by forming a 0.5 μm thick magnesium oxide layer as a protective film by electron beam evaporation on the substrate on which the dielectric was formed.
[0029]
Next, an address electrode is formed on PD200, a back dielectric is formed using a glass paste containing glass powder containing 70% by weight of lead oxide as a main component, and then barrier ribs and RGB phosphor layers are formed. A back plate was produced.
[0030]
The front plate and the back plate were sealed using sealing glass, and Ne gas containing 5% Xe was sealed so as to have an internal gas pressure of 66500 Pa. Furthermore, a driving circuit was mounted to produce a PDP. A voltage was applied to the scan electrode of the PDP to emit light. When the luminance was measured using the luminance meter, it was 250 cd / m ² . Further, the display was performed continuously for 24 hours, but no abnormal discharge occurred.
[0031]
(Example 3)
A front plate was produced in the same manner as in Examples 1 and 2, except that Ba borosilicate glass containing 65% by weight of bismuth oxide and 10% by weight of zinc oxide was used as the glass powder of the dielectric layer forming paste for the front plate. did. Next, a back substrate was prepared in the same manner as in Example 2 except that 2% by weight of nickel powder was added to a paste mainly composed of Ba borosilicate glass powder containing 70% by weight of lead oxide. These front and back substrates were sealed to produce a PDP and displayed continuously for 4 hours, but no abnormal discharge occurred.
[0032]
(Comparative Example 1)
In the same manner as in Examples 1 and 2, except that a glass paste obtained by kneading 75% glass powder, 15% ethyl cellulose, and 10% terpineol was used as the dielectric layer forming paste for the front plate. A back plate was produced, and a PDP was produced and displayed. The brightness of the PDP was 228 cd / m ² . However, an average of 4 abnormal discharges occurred during 1 hour of display. Further, when the volume resistivity of the dielectric layer was measured in the same manner as in Example 1, it was 1 × 10 ¹⁵ Ω · m.
[0033]
(Comparative Example 2)
As in Examples 1 and 2, except that Ba borosilicate glass (refractive index: 1.69) containing 60% by weight of lead oxide was used as the glass powder of the dielectric layer forming paste for the front plate. A face plate and a back plate were produced, and a PDP was produced and displayed. Further, no abnormal discharge occurred even when the display was performed continuously for 24 hours. However, the luminance was 195 cd / m ² , which was inferior to Example 2. Further, when the volume resistivity of the dielectric layer was measured in the same manner as in Example 1, it was 4 × 10 ¹⁰ Ω · m.
[0034]
【The invention's effect】
The plasma panel member, the plasma display panel, and the glass paste of the present invention can provide a plasma display panel that has high luminance, is unlikely to cause abnormal discharge, and has excellent reliability.

Claims (9)

A front plate for a plasma display panel in which an electrode and a dielectric layer 1 covering the electrode are formed on a substrate, wherein the dielectric layer 1 contains a glass component and conductive fine particles, and the glass component contained in the dielectric layer 1 the average refractive index Ng and the average refractive index Nc of the conductive fine particles, a front panel for a plasma display panel and satisfies the following formula (1).
−0.1 ≦ Nc−Ng ≦ 0.1 (1) 2. The front panel for a plasma display panel according to claim 1, wherein the dielectric layer 1 has a volume resistivity of 1 * 10 < ⁵ > to 1 * 10 < ¹³ > [Omega] .m. The front plate for a plasma display panel according to claim 1 or 2, wherein the content ratio of the conductive fine particles in the dielectric layer 1 is 0.1 to 10% by weight. The front plate for a plasma display panel according to claim 1, wherein the visible light transmittance of the dielectric layer 1 is 70% or more . A plasma display panel, a front panel for a plasma display panel according to claim 1, the dielectric layer 2 is formed covering the address electrodes and the address electrodes on the substrate surface, on which a plasma display panel backplate barrier rib for partitioning the discharge cell is opposed, a plasma display panel, characterized by the use of front panel for the plasma display panel as a substantial image display surface. 6. The plasma display panel according to claim 5, wherein the dielectric layer 2 formed on the back plate for the plasma display panel contains conductive fine particles. A glass paste for forming a dielectric layer of a front panel for a plasma display panel mainly composed of glass powder and an organic binder, further comprising conductive fine particles, the average refractive index Nc of the conductive fine particles and the average refraction of the glass powder The glass paste for forming a dielectric layer of the front plate for a plasma display panel , wherein the rate Ng has the following relationship (1):
−0.1 ≦ Nc−Ng ≦ 0.1 (1) 8. The glass paste for forming a dielectric layer of a front panel for a plasma display panel according to claim 7, wherein at least one of tin oxide, ITO and zinc antimonate is used as the conductive fine particles. 9. The plasma display panel use according to claim 7, wherein the content of the conductive fine particles is 0.1 to 10% by weight with respect to the glass paste for forming a dielectric layer of the front plate for plasma display panel. Glass paste for forming the dielectric layer of the front plate .