JP2001101975A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel which enables to stabilize writing operation in an emitting display of a group of blue, green and red discharging cells, and to avoid turbidity of a display emitting and/or miswriting. SOLUTION: The gaps between a scanning electrode 6 and a holding electrode 7 are varied according to the emitting colors of the opposed fluorescent layers. The gaps are set to Dr>=Db>=Dg, if the gap between the red color fluorescent layers is Dr, the gap between the green color fluorescent layers Dg, and the gap between the blue color fluorescent layers Db.

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 used for an image display device such as a television receiver or an advertisement display panel, and more particularly to a structure of a discharge cell of an AC type plasma display panel.

[0002]

2. Description of the Related Art As an example of a conventional plasma display panel, an AC type plasma display panel (hereinafter, referred to as an AC type plasma display panel) will be described.
FIG. 5 shows a partially enlarged perspective view of the “panel”. Of the surface substrate 2 and the rear substrate 3 opposed to each other with the discharge space 1 interposed therebetween, the surface substrate 2 made of a transparent material such as glass forms a pair covered with a dielectric layer 4 and a protective film layer 5. A large number of stripe-shaped scan electrodes 6 and sustain electrodes 7 are alternately arranged in parallel.
A large number of stripe-shaped data electrodes 8 are provided orthogonal to the sustain electrodes 7, and the data electrodes 8 are separated from each other to form a discharge space 1.
Are formed, a large number of stripe-shaped partition walls 9 are arranged in parallel. Phosphor layer 1 on data electrode 8 and partition wall 9
0 (only a part is shown in the drawing). Discharge space 1
Is filled with a mixed gas of at least one rare gas of helium, neon, and argon and xenon.
In the phosphor layer 10, three red light-emitting phosphors, green light-emitting phosphors, and blue light-emitting phosphors are alternately formed, and one pixel is formed by three adjacent discharge cells. Area B indicated by a broken line in FIG. 5 is a portion corresponding to one cell.

FIG. 4 is an enlarged plan view of one cell (FIG. 4).
(A)) and a side view (FIG. 4 (b)).
One pixel is composed of three discharge cells surrounded by partition walls at the left and right ends and upper and lower dashed lines. Discharge cells 11 b and 11 are formed in a region surrounded by front substrate 2, rear substrate 3 and partition 9.
g and 11r are formed. Discharge cells 11b, 11
g, 11r, this discharge cell 1
1b, 11g, and 11r, corresponding to the blue light-emitting phosphor layer 1
0b, green light-emitting phosphor layer 10g, red light-emitting phosphor layer 10
r and data electrodes 8b, 8g, 8r are respectively provided. On the other hand, scan electrodes 6 and sustain electrodes 7 are provided on the front substrate.
Are provided, and the discharge electrode spacing D between the scan electrode 6 and the sustain electrode 7 is such that Db, Dg, and Dr are equally spaced for the discharge cells of each color.

[0004] The operation of the discharge light emission display will be briefly described. First, in a write operation, when a positive write pulse voltage Vd is applied to the data electrode 8 and a negative scan pulse voltage Vsc is applied to the scan electrode 6, a write discharge occurs in the discharge space 1 and a write discharge occurs on the scan electrode 6. Positive charges are accumulated on the surface of the protective film layer 5. Thereafter, at the beginning of the sustaining operation, a negative sustaining pulse is applied to sustaining electrode 7, and a negative sustaining pulse voltage Vs is alternately applied to scanning electrode 6 and sustaining electrode 7, whereby scanning electrode 6 and sustaining electrode 7 are applied. And the sustain discharge is maintained. Finally, the sustain discharge is stopped by applying a negative erase pulse voltage Ve to the sustain electrode 7.

[0005] Since the blue, green, and red phosphors have different material compositions, the amount of charge accumulated during a write operation is different, and the behavior differs for each color when transitioning from a write operation to a sustain operation. The writing voltage Vd is different. As an example, BaMgAl is added to the blue light emitting phosphor 10b.
₁₀ O ₁₇ : Eu, Zn ₂ SiO ₄ :
In the case where YGdBO ₄ : Eu is used for Mn and the red light emitting phosphor 10r, a writing voltage (hereinafter referred to as “completely lighting writing voltage”) Vpd at which discharge is stabilized for each discharge cell.
Was measured, and the measurement results are shown in FIG. As shown in FIG. 6, the complete lighting write voltage is Vb for the blue light emitting phosphor.
pd = 55 [V], Vgpd = 65 with green light-emitting phosphor
[V], Vrpd = 50 [V] for the red light emitting phosphor.

[0006]

As described above, in the conventional panel, since the writing voltage Vd differs for each phosphor, in order to stabilize the discharge display operation, the green light-emitting fluorescent light having the highest full lighting writing voltage Vpd is required. Vgpd of the body
As described above, it is necessary to set the write voltage Vd. However, setting Vd high has a problem that discharge becomes unstable in a discharge cell of a red light emitting phosphor having a low writing voltage Vpd, causing flickering and erroneous writing.

The present invention solves such a problem and stabilizes a writing operation in a light emitting display.
It is another object of the present invention to eliminate flickering of display light emission and erroneous writing.

[0008]

According to a plasma display panel of the present invention, a front substrate and a rear substrate are provided to face each other, and a plurality of partitions are provided between the front substrate and the rear substrate. A discharge cell is formed in a region surrounded by the substrate, the back substrate, and the partition, and at least the front surface substrate in the discharge cell is provided with stripe-shaped scan electrodes and sustain electrodes substantially in parallel with each other. In a plasma display panel in which a phosphor layer is provided on the surface so as to be orthogonal to the scanning electrode and the sustaining electrode, the interval between the scanning electrode and the sustaining electrode is determined according to the emission color of the opposing phosphor layer. It is characterized by being different (claim 1).

As described above, by changing the distance between the scanning electrode and the sustain electrode according to the difference in the writing voltage for each phosphor when the distance between the scanning electrode and the sustain electrode is constant,
The difference between the write voltages can be reduced.

Further, the phosphor layers are each composed of a stripe-shaped red light-emitting phosphor layer, a green light-emitting phosphor layer, and a blue light-emitting phosphor layer, and the distance between the scan electrode and the sustain electrode is
The distance at a location facing the red light emitting phosphor layer is D
r, Dg at a location facing the green light emitting phosphor layer, and Db at a location facing the blue light emitting phosphor layer, Dr
It is preferable that ≧ Db ≧ Dg (claim 2). When a general phosphor is used, the writing voltage increases in the order of the red phosphor, the blue phosphor, and the green phosphor. Therefore, by setting Dr ≧ Db ≧ Dg, the writing voltage can be made constant. be able to.

[0011]

FIG. 2 is a partially enlarged perspective view of a plasma display panel according to the present invention. Since the basic configuration is the same as that of the conventional one, the description is omitted, and the scan electrode and the sustain electrode, which are features of the present invention, will be described below.

FIG. 1 shows an enlarged plan view (FIG. 1A) and a side view (FIG. 1B) of an area A (one pixel) in FIG. The front substrate 2 and the rear substrate 3 are provided facing each other at a predetermined interval, and a plurality of partition walls 9 are provided between the front substrate 2 and the rear substrate 3. The discharge cell 1 is located in a region surrounded by the front substrate 2, the rear substrate 3, and the partition 9.
1b, 11g, and 11r are formed. Each of the discharge cells has a phosphor 10b, 1
0g and 10r, and data electrodes 8b, 8g and 8r, respectively. On the front substrate, scanning electrodes 6 and sustaining electrodes 7 are provided for each discharge cell of each color.
They are provided at intervals of g and Dr.

As shown in FIG. 1A, the distance between the scanning electrode 6 and the sustaining electrode 7 is Dr in the discharge cell 11r where the red light emitting phosphor 10r is formed, and the green light emitting phosphor 10g is formed. The distance in the discharged cell 11g is D
g, discharge cell 11b on which blue light emitting phosphor 10b is formed
If the interval at is set to Db, the relationship is Dr ≧ Db ≧ Dg.

An example of specific numerical values will be shown. 42 inches 1
In the 6: 9 panel, the widths Wb, Wg, and Wr of the blue, green, and red phosphor layers were 0.36 [mm] (the total width was 1.08 mm), and the green sustain discharge electrode interval Dg was 0. .
06 [mm], the blue sustain discharge electrode interval Db is 0.08
[Mm], the distance between the red sustain discharge electrodes Dr is 0.10 [m
m]. In the conventional panel, each phosphor width W
b, Wg and Wr are all 0.36 [mm], and each of the sustain discharge electrode intervals Db, Dg and Dr is 0.08 [m].
m]. The phosphor 10 has the same structure as the conventional panel,
BaMgAl ₁₀ O ₁₇ : Eu was used for the blue phosphor 10b, Zn ₂ SiO ₄ : Mn for the green phosphor 10g, and YBO ₄ : Eu for the red phosphor 10r.

The complete lighting write voltage Vpd was measured for each discharge cell of each phosphor. FIG. 3 shows the measurement results.
The complete lighting write voltage is Vbpd = 53 for a blue phosphor.
[V], Vgpd = 57 [V] for the green phosphor, and Vrpd = 50 [V] for the red phosphor, and almost constant characteristics with a small difference compared to the conventional example (FIG. 6) were obtained.

As described above, by changing the interval D between the sustain discharge electrodes in accordance with the material composition and characteristics of the phosphor, the charge accumulated during the write operation of the blue, green and red discharge cells differs. However, since the transition from the write discharge to the sustain operation can be performed stably and quickly, the write voltage of each color can be stabilized as a result. In accordance with this, the occurrence of erroneous discharge is reduced, and a panel having good display characteristics can be formed.

In the present embodiment, the interval Dg between the sustain discharge electrodes corresponding to the green phosphor is minimized.
The blue Db and the red Dr are reduced in this order, but this relationship may be changed according to the write voltage determined by the phosphor material.

[0018]

As described above, according to the present invention,
The writing operation voltage in the light emission display of the blue, green, and red discharge cell groups becomes substantially constant, and a plasma display panel with good display quality can be provided.

[Brief description of the drawings]

1A is a partially enlarged plan view of a plasma display panel of the present invention, and FIG.

FIG. 2 is a partially enlarged perspective view of the plasma display panel of the present invention.

FIG. 3 is a diagram showing a relationship between a phosphor color and a writing voltage in the plasma display panel of the present invention.

FIG. 4A is a partially enlarged plan view of a conventional plasma display panel, and FIG.

FIG. 5 is a partially enlarged perspective view of a conventional plasma display panel.

FIG. 6 is a diagram showing a relationship between a phosphor color and a writing voltage in a conventional plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge space 2 Front substrate 3 Back substrate 4 Dielectric layer 5 Protective film layer 6 Scan electrode 7 Sustain electrode 8 Data electrode 9 Partition wall 10 Phosphor 11 Discharge cell

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kenji Kiriyama 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuhito Tahara 1006 Okadoma Kadoma City, Osaka Prefecture Matsushita Electric Industrial F Terms (reference) 5C040 FA01 FA04 GB03 GC02 GG08 5C094 AA03 AA53 BA31 CA19 CA24 EA03 EA07 FA10 FB20 GA10 HA01 HA08

Claims (3)

[Claims] 1. A front substrate and a rear substrate are provided facing each other, a plurality of partitions are provided between the front substrate and the rear substrate, and the plurality of partitions are surrounded by the front substrate, the rear substrate, and the partitions. A discharge cell is formed in a region where the scanning electrode and the sustain electrode are provided in a substantially parallel manner on at least the surface substrate in the discharge cell, and is orthogonal to the scan electrode and the sustain electrode on the surface of the back substrate. In the plasma display panel provided with the phosphor layer as described above, the interval between the scan electrode and the sustain electrode is made different depending on the emission color of the opposing phosphor layer. . 2. The phosphor layer includes a red light-emitting phosphor layer, a green light-emitting phosphor layer, and a blue light-emitting phosphor layer, each of which has a stripe shape. The distance at a position facing the body layer is Dr,
Assuming that Dg is at a location facing the green light emitting phosphor layer and Db is at a location facing the blue light emitting phosphor layer, Dr ≧ D
The plasma display panel according to claim 1, wherein b ≧ Dg. 3. The plasma display panel according to claim 2, wherein the green light-emitting phosphor is made of a ZnSiO ₄ material.