Plasma display panel
View Patent ↗A plasma display panel is provided in which an operational quality is prevented from being deteriorated by resonance of a substrate. The plasma display panel includes a partition for dividing a discharge gas space defined by a pair of substrates and a sealing material in accordance with a cell arrangement of a display screen. There is a void space between the upper surface of the end portion of the partition and the surface of the opposed substrate, the surfaces contacting each other. The natural frequency of the portion from the inner edge of the void space to the inner edge of the sealing material is raised above audio frequency region of a human.
1. A plasma display panel comprising:
a first and a second substrates opposed to each other and sealed at a peripheral portion of the opposed area with a sealing material so as to define a discharge gas space;
a partition attached to the second substrate for dividing the discharge gas space in accordance with a cell arrangement of a display screen;
a gap between the substrates, the size of the gap being dependent on the height of the partition that is apart from the sealing material;
a plurality of electrodes arranged on both the first and the second substrates; and
a void space between the upper surface of the partition and the opposed surface to be contacted at the vicinity of an end portion of the partition, the void space being generated when the end portion of the partition is raised, wherein a natural frequency of a portion of the first substrate from an inner edge of the void space to an inner edge of the sealing material is higher than 20.000 hertz.
2. A plasma display panel comprising:
a first and a second substrates opposed to each other and sealed at a peripheral portion of the opposed area with a sealing material so as to define a discharge gas space;
a partition attached to the second substrate for dividing the discharge gas space in accordance with a cell arrangement of a display screen;
a gap between the substrates, the size of the gap being dependent on the height of the partition that is apart from the sealing material;
a plurality of electrodes arranged on both the first and the second substrates; and
a void space between the upper surface of the partition and the opposed surface to be contacted at the vicinity of an end portion of the partition, the void space being generated when the end portion of the partition is raised, wherein a natural frequency of a portion of the first substrate from an inner edge of the void space to an inner edge of the sealing material is higher than 16000 hertz.
3. The plasma display panel according to claim 1 , wherein a distance L from the inner edge of the void space to the sealing material satisfies the following inequality:
L
<
a
n
2
π
f
max
·
Eh
2
12
ρ
where L is the distance from the inner edge of the void space to the sealing material, a n is a constant (=22), f max is a frequency of 20,000 hertz, E is a Young's modulus of the first substrate, h is a thickness of the first substrate, and ρ is a density of the first substrate.
4. The plasma display panel according to claim 1 , wherein a thickness h of the first substrate satisfies the following inequality:
h
>
2
π
L
2
f
max
a
n
·
12
ρ
E
where h is the thickness of the first substrate, L is a distance from the inner edge of the void space to the sealing material, a n is a constant (=22), f max is a frequency of 20,000 hertz, ρ is a density of the first substrate, and E is a Young's modulus of the first substrate.
5. The plasma display panel according to claim 1 , wherein a density ρ of the first substrate satisfies the following inequality:
ρ
<
E
12
·
(
a
n
h
2
π
L
2
f
max
)
2
where ρ is the density of the first substrate, E is a Young's modulus of the first substrate, a n is a constant (=22), h is a thickness of the first substrate, L is a distance from the inner edge of the void space to the sealing material, and f max is a frequency of 20,000 hertz.
6. The plasma display panel according to claim 1 , wherein a Young's modulus E of the first substrate satisfies the following inequality:
E
>
12
ρ
·
(
2
π
L
2
f
max
a
n
h
)
2
where E is the Young's modulus of the first substrate, ρ is a density of the first substrate, L is a distance from the inner edge of the void space to the sealing material, fmax is a frequency of 20,000 hertz, an is a constant (=22), and h is a thickness of the first substrate.
7. The plasma display panel according to claim 2 , wherein a distance L from the inner edge of the void space to the sealing material satisfies the following inequality:
L
<
a
n
2
π
f
max
·
Eh
2
12
ρ
where L is the distance from the inner edge of the void space to the sealing material, a n is a constant (=22), f max is a frequency of 16,000 hertz, E is a Young's modulus of the first substrate, h is a thickness of the first substrate, and ρ is a density of the first substrate.
8. The plasma display panel according to claim 2 , wherein a thickness h of the first substrate satisfies the following inequality:
h
>
2
π
L
2
f
max
a
n
·
12
ρ
E
where h is the thickness of the first substrate, L is a distance from the inner edge of the void space to the sealing material, a n is a constant (=22), f max is a frequency of 16,000 hertz, ρ is a density of the first substrate, and E is a Young's modulus of the first substrate.
9. The plasma display panel according to claim 2 , wherein a density ρ of the first substrate satisfies the following inequality:
ρ
<
E
12
·
(
a
n
h
2
π
L
2
f
max
)
2
where ρ is the density of the first substrate, E is a Young's modulus of the first substrate, a n is a constant (=22), h is a thickness of the first substrate, L is a distance from the inner edge of the void space to the sealing material, and f max is a frequency of 16,000 hertz.
10. The plasma display panel according to claim 2 , wherein a Young's modulus E of the first substrate satisfies the following inequality:
E
>
12
ρ
·
(
2
π
L
2
f
max
a
n
h
)
2
where E is the Young's modulus of the first substrate, ρ is a density of the first substrate, L is a distance from the inner edge of the void space to the sealing material, fmax is a frequency of 16,000 hertz, a n is a constant (=22), and h is a thickness of the first substrate.