Plasma display panel
A plasma display panel having a dielectric protection layer ( 14 ) including MgO and phosphorlayers ( 25 R, 25 G, 25 B) for red, green, and blue respectively wherein none of the phosphor layers contain any member of the group consisting of Group IV elements, transition metals, alkali metals, and alkaline earth metals, or wherein all the phosphor layers each contain a specific amount of one or more members of the group consisting of Group IV group elements, transition metals, alkali metals and alkaline earth metals. In such a plasma display panel, changes over the course of time in the impedance of the dielectric protection layer ( 14 ) is suppressed, and the phosphor layers are uniform with respect to the directional characteristics of the changes of the impedances, which results in suppression of occurrence of black noise.
1. A plasma display panel in which a pair of substrates are disposed so as to oppose each other and have a discharge space therebetween and in which a dielectric protection layer including MgO and phosphor layers for red, green, and blue respectively are formed so as to face the discharge space, comprising:
each of the phosphor layers contains at least one transition metal in an amount that causes the impedance of the dielectric protection layer to rise by a same degree over the course of time in the discharge space that corresponds to the phosphor layers red, green and blue,
wherein a content ratio of said at least one transition metal in each of the phosphor layers is within a range between 500 mass ppm and 30,000 mass ppm inclusive, and said at least one transition metal is selected from a group consisting of W, Mn, Fe, Co, and Ni.
2. The plasma display panel of claim 1 , wherein a phosphor member included in at least one of the phosphor layers contains, in a composition thereof, said at least one transition metal.
3. The plasma display panel of claim 1 , wherein the dielectric protection layer contains at least one Group IV element.
4. The plasma display panel of claim 1 , wherein the dielectric protection layer contains at least one transition metal.
5. The plasma display panel of claim 1 , wherein the dielectric protection layer contains at least one member of the group consisting of alkali metals and alkaline earth metals.
6. The plasma display panel of claim 1 , wherein at least part of a surface of one or more of the phosphor layers facing the discharge space is covered with a phosphor protection layer, the phosphor protection layer (i) having an ultraviolet ray transmittance rate of 80% or higher, and (ii) having a function of inhibiting one or more of elements included in the one or more phosphor layers that are to degrade discharge properties of the dielectric protection layer from dispersing into the discharge space.
7. A plasma display panel in which a pair of substrates are disposed so as to oppose each other and have a discharge space therebetween and in which a dielectric protection layer including MgO and phosphor layers for red, green, and blue respectively are formed so as to face the discharge space, comprising:
each of the phosphor layers contains at least one transition metal in an amount that causes the impedance of the dielectric protection layer to rise by a same degree over the course of time in the discharge space that corresponds to the phosphor layers red, green and blue,
wherein a content ratio of said at least one transition metal in each of the phosphor layers is within a range between 300 mass ppm and 120,000 mass ppm inclusive, and the content ratio is substantially same for all of the phosphor layers and said at least one transition metal is selected from the group consisting of W, Mn, Fe, Co, and Ni.
8. The plasma display panel of claim 7 , wherein variations among the phosphor layers with respect to the content ratio of said at least one transition metal are no larger than 40,000 mass ppm.
9. The plasma display panel of claim 7 , wherein for each of the phosphor layers, a phosphor member containing, in a composition thereof, said at least one transition metal is selected so as to be included in the phosphor layer.
10. The plasma display panel of claim 9 , wherein said at least one transition metal contained in the composition of the phosphor member is in common with all of the phosphor layers.