JPH08167380A - Plasma display panel - Google Patents

Abstract

PURPOSE: To improve the brightness without increasing the write-in voltage by bringing a fluorescent body close to the discharge without reducing the distance between a scanning electrode and a data electrode. CONSTITUTION: A transparent electrode 102 consisting of a scanning electrode and a holding electrode is formed on a front substrate 101, and a bus electrode 103 is formed thereon. These electrodes 102, 103 are covered by a transparent insulating layer 104, a black partition wall 106 is formed thereon, and covered by a protecting layer 105. A data electrode 110 traveling orthogonal to the transparent electrode 102 is formed on a rear substrate 109, a white insulating layer 108 and a white partition wall 107 are formed thereon, and a fluorescent body 111 corresponding to the luminous color of each discharge cell is applied thereto. The width of the white partition wall 107 is made larger than that of the black partition wall 106.

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 information display terminal, a flat-screen television or the like, and more particularly to a color plasma display panel having a partition structure suitable for high brightness.

[0002]

2. Description of the Related Art A color plasma display panel is
It is a display that excites and emits a fluorescent substance by ultraviolet rays generated by gas discharge to obtain visible light to perform a display operation, and is attracting attention as a device capable of realizing a high-definition large flat display panel. The drive system is roughly classified into AC type and DC type.
The AC type is excellent in brightness, luminous efficiency, and life.

FIG. 4 is a sectional view of a conventional reflective AC surface discharge color plasma display panel. As shown in the figure, the plasma display panel is constructed by bonding a front panel 21 and a rear panel 22 together.
In the front panel 21, a transparent electrode 202 is formed on the back surface of a glass front substrate 201. A plurality of transparent electrodes 202 are formed in a strip shape in a direction parallel to the paper surface. Between the adjacent transparent electrodes 202, usually several tens kHz to several tens of kHz
Although a pulsed AC voltage of 0 kHz is applied to obtain a discharge for display, the tin oxide or ITO film that is usually used for the transparent electrode 202 has a high sheet resistance of several tens of Ω / □, so that it is particularly suitable for large panels and high In a fine panel, the electrode resistance becomes several tens of kΩ, and the applied voltage pulse does not rise sufficiently to make driving difficult. Therefore, the bus electrode 203, which is usually a thick metal film, is formed on the transparent electrode 202 to reduce the resistance value of the electrode.

These electrodes are covered with a transparent insulating layer 204. The transparent insulating layer 204 is usually a thick film of low melting point lead glass. A black partition wall 206 is formed thereon. The black partition wall 206 is usually formed by means of a screen printing method using a thick film paste containing a black pigment. After that, a protective layer 205 which covers the transparent insulating layer 204 and the black partition wall 206 is formed. The protective layer 205 is, for example, MgO.
Thin film (evaporation, sputtering, etc.) or thick film (printing, spraying, etc.).

On the other hand, in the rear panel 22, the rear substrate 20
9, a data electrode 210 for writing display data is formed of a thick film or a thin film, and this is covered with a white insulating layer 208 made of a thick film paste containing low melting point lead glass and a white pigment. The data electrode 210 is perpendicular to the paper surface,
That is, it is formed orthogonal to the transparent electrode 202. White partition walls 207 are formed on the white insulating layer 208 by a thick film method such as screen printing, and phosphors 211 corresponding to the emission color of each discharge cell are applied to the portions that become the discharge cells. The phosphor 211 is also formed on the side surface of the white partition wall 207 in order to increase the coating area.

The rear panel 22 formed as described above
In addition, the front panel 21 is replaced with the white partition 2 of the rear panel.
07, a black partition wall 206 of the front panel is brought into contact with and bonded to hermetically seal the gas.
And a mixed gas of Ne and Xe is sealed at about 300 to 500 torr. As a result, the discharge gas space 212 is formed.

When a pulsed AC voltage is applied between adjacent transparent electrodes 202 (in FIG. 4, the transparent electrodes 202 are parallel to the paper surface and are adjacent to each other in the vertical direction to the paper surface), gas discharge (in this case, Surface discharge) occurs and the discharge gas space 2
Plasma is generated in 12. The ultraviolet light generated here excites the phosphor 211 to generate visible light, and display light emission is obtained through the front substrate 201.

Adjacent transparent electrodes 20 for generating surface discharge
Reference numeral 2 is composed of scan electrodes and sustain electrodes. In actual panel driving, a sustain pulse is applied to the transparent electrode 202 which is a surface discharge electrode, and when a discharge is generated, a voltage is applied between the scan electrode and the data electrode 210 to generate a counter discharge. , This discharge is maintained between the surface discharge electrodes by the sustain pulse.

A plan view of the above-mentioned conventional plasma display panel is shown in FIG. FIG. 4 is a sectional view taken along the line BB ′ of FIG. Black partition wall 206 formed on the front substrate
Are formed in a grid shape and define each discharge cell.
The white partition is not shown because it is hidden by the black partition 206 in the figure, but it is formed in a stripe shape in the vertical direction of the figure.

The transparent electrode 202 and the bus electrode 203 are
Formed in parallel at a predetermined interval, for example, about 100 μm,
The discharge cells defined by the black barrier ribs are arranged so that two discharge cells enter each discharge cell. A sustain discharge is generated between the adjacent transparent electrodes 202. Although not shown in the figure, the data electrode 210 is arranged orthogonal to the transparent electrode 202 and in the center of the discharge cell. A surface discharge plasma display panel of this type is, for example, Sano, Y. et al. "A 19-in.
-Diagonal Full-Color AC Plasma TV-Display ", Proceed
ings of the 12th International Display Research Co
nference, pp.609-612, Oct.1992 and the like.

[0011]

SUMMARY OF THE INVENTION In developing a plasma display panel, one of the biggest problems is improvement of brightness. The brightness of the phosphor becomes higher when it is as close as possible to the discharge generated at the surface discharge electrode. For this purpose, the front substrate and the rear substrate may be brought close to each other, that is, the height of the partition wall may be lowered. However, when the front substrate and the rear substrate are brought close to each other, the scan electrode and the data electrode, which are one of the pair of surface discharge electrodes, come too close to each other, and the discharge space is narrowed, so that discharge is less likely to occur. Therefore, the start voltage of the counter discharge for writing data becomes high, which makes driving difficult. The present invention has been made in view of this point, and an object thereof is to ensure an appropriate discharge space and prevent the discharge start voltage from rising, while improving brightness. is there.

[0012]

In order to achieve the above object, according to the present invention, a group of surface discharge electrodes (102) consisting of a pair of scan electrodes and sustain electrodes and a first black substrate are provided on a front substrate (101). A front panel (11) having a partition wall (106) formed thereon, a data electrode (110) for writing data on a rear substrate (109), and a white second partition wall (10).
And (7) a rear panel (12) formed by forming the second barrier rib, wherein the width of the second barrier rib is wider than the width of the first barrier rib (101). To be done. And preferably, the difference between the width of the second partition wall (107) and the width of the first partition wall (106) is 60% of the distance (d) between the adjacent first partition walls.
Will be done below.

[0013]

According to the plasma display panel of the present invention, the phosphor is brought closer to the sustain electrode while keeping the distance between the scan electrode and the data electrode at the conventional ideal distance, that is, without increasing the data write voltage. It will be possible. Therefore, it is possible to improve the brightness while maintaining the conventional drive circuit and drive conditions.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention. As shown in the figure, the plasma display panel is constructed by bonding a front panel 11 and a rear panel 12 to each other, and the discharge gas space 1 is provided between them.
12 are formed. In the front panel 11, a transparent electrode 102, which is a pair of a scan electrode and a sustain electrode, is formed on a front substrate 101 in parallel with the paper surface, and a bus electrode 103 for lowering the resistance value of the transparent electrode is formed on the transparent electrode 102. Are formed. These electrodes 102 and 103 are transparent insulating layers 104.
, A black partition 106 is formed on the black partition 106, and a protective layer 105 is further coated.

In the rear panel 12, a data electrode 110 running orthogonally to the transparent electrode 102 is formed on a rear substrate 109, and a white insulating layer 108 covers the data electrode 110. A white partition 107 is formed on top of this, and a phosphor 111 corresponding to the emission color of each discharge cell is further applied.

Although the basic structure is the same as that of the conventional example shown in FIG. 4, the width of the white partition 107 and the shape of the phosphor 111 applied to the surface thereof are different. Unlike the conventional example, the white partition 107 is made wider than the black partition 106. Then, the phosphor 111 is also applied on the data electrodes 110 and on the side surfaces and the tops of the white partition walls 107. Therefore, the coating area of the phosphor is the same as in the conventional example, but the phosphor 111 close to the front substrate 101 is used.
Area increases. Therefore, the brightness is improved.

At this time, since the state on the data electrode 110 is not different from the conventional state, the distance between the data electrode 110 and the transparent electrode 102 serving as the scanning electrode does not change, and the voltage for data writing discharge does not rise. A plan view of this embodiment is shown in FIG.
Shown in FIG. 1 is a sectional view taken along the line AA ′ of FIG. The shapes of the black partition wall 106, the transparent electrode 102, and the bus electrode 103 are the same as those in the conventional example, but the white partition wall 107 is wider than the black partition wall 106, so that the protruding portion from the black partition wall 106 can be seen from above the front substrate. ing.

FIG. 3A shows measured data when the size of the white partition walls is changed in the plasma display panel of this embodiment. 3 (b) is shown by omitting electrodes, insulating layers, etc. from the sectional view of FIG. 1, and as shown in FIG. Let a be the length of the white partition wall extending inside the cell. The graph has a / d on the horizontal axis,
The luminance L, the writing voltage Vd, and the surface discharge sustaining voltage Vs at this time are normalized by the values when a / d = 0 and are shown on the vertical axis.

The panel for which this data was taken is d = 0.2
5 mm, data electrode width 0.15 mm, black partition 10
The height of each of 6 and the white partition 107 is 80 μm. The brightness L increases as a / d increases, that is, as the width of the white partition increases. However, the increase in the brightness L gradually reaches a peak. This is because the white partition walls 107 are too close to the center of the discharge, which adversely affects the discharge efficiency. Due to this adverse effect, the sustaining voltage Vs for surface discharge rises as the luminance L reaches the ceiling.

The write voltage Vd does not change up to a / d = 20%, but if it exceeds this, the interval between the white partition walls 107 becomes narrower and the data electrode becomes narrower equivalently. Shows a sharp rise from. Thus, it is extremely difficult to drive the display panel in the region where the sustain voltage Vs has risen, and therefore it cannot be used in the region where the display voltage has risen. Therefore, the white partition wall has a / d
= 30%, that is, the width of the white partition is wider than that of the black partition, and the width difference between the white partition and the black partition is up to 60% of the distance between the black partition.

In this data, the relationship between the luminance L, the writing voltage Vd, the sustaining voltage Vs and a / d is almost the same even if the pitch of the barrier ribs is changed, and the height of the barrier ribs is the same for the black barrier ribs and the white barrier ribs. The experiment was conducted in the range of 70 μm to 250 μm, but the effect was the same. Therefore, the cell characteristics L, V
It can be concluded that d, Vs are dominated by a / d. Therefore, the present invention can be applied to plasma display panels of any cell pitch.

In the panel structure according to the present invention, the white partition and the black partition are separately formed on the front substrate and the rear substrate, respectively, but it is technically possible to form all of them on the rear substrate side. However, in that case, it becomes difficult to prevent crosstalk caused by the discharge extending between the adjacent discharge cells along the electrodes. White partition,
The black partition wall is usually formed by printing a large number of times, and it is extremely difficult to form the top part flat because the top part of the black partition wall accumulates variations in the film thickness of each layer. Therefore, when the black partition wall is formed on the rear substrate side, a gap is created along the transparent electrode, which causes crosstalk.

In the plasma display panel according to the present invention, a black partition is formed on the front substrate side,
Since there is no gap near the transparent electrode, the above-mentioned crosstalk can be prevented. Further, in the panel structure of the present invention, a slight gap is formed in the vicinity of the central portion of the cell, which is separated from the protective layer by the height of the black partition wall, and the priming particles appropriately enter and leave between the adjacent cells. The operation is stable.

When the black partition wall is formed on the rear substrate side, it is inevitable that the phosphor adheres to the top of the black partition wall in the phosphor coating step. Therefore, the top of the black partition becomes white, the contrast is lowered, and the meaning of forming the partition with a black material is lost.

In the above embodiment, the heights of the black partition wall and the white partition wall are the same, but it is not always necessary to do so. When the height of the black partition wall is reduced, the phosphor coated on the top portion of the white partition wall is closer to the discharge, so that the brightness can be further improved. When the height of the black partition wall is 10 μm or less, surface discharge is less likely to occur in the portion facing the white partition wall, and the function of preventing crosstalk between adjacent cells is gradually diminished. Further, if the height of the white partition wall is increased by lowering the black partition wall, the phosphor coating area is expanded by the height, and the brightness can be further improved. Therefore, the height of the black partition is 10
The best value is from μm to 50 μm.

In the above-mentioned embodiments, the partition walls on the front substrate side are described as a grid shape, but the same effect can be obtained even if the partition walls have a shape only in the direction orthogonal to the transparent electrodes, that is, a stripe shape. be able to.

[0027]

As described above, the AC according to the present invention
The surface discharge type plasma display panel is one in which the width of the white partition wall formed on the rear substrate side is larger than the width of the black partition wall formed on the front substrate side. It is possible to bring the phosphor closer to the discharge while keeping the distance between the data electrodes at the conventional ideal distance, that is, without increasing the data write voltage. Therefore, according to the present invention, it is possible to improve the brightness while keeping the conventional driving circuit and driving conditions.

[Brief description of drawings]

FIG. 1 is a sectional view of a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a plan view of a plasma display panel according to an embodiment of the present invention.

FIG. 3 is a graph showing the relationship between the width of a white partition, the brightness L, the write voltage Vd, and the sustain voltage Vs, for explaining the effect of the present invention.

FIG. 4 is a sectional view of a conventional plasma display panel.

FIG. 5 is a plan view of a conventional plasma display panel.

[Explanation of symbols]

 11, 21 front panel 12, 22 rear panel 101, 201 front substrate 102, 202 transparent electrode 103, 203 bus electrode 104, 204 transparent insulating layer 105, 205 protective layer 106, 206 black partition 107, 207 white partition 108, 208 white Insulating layer 109, 209 Rear substrate 110, 210 Data electrode 111, 211 Phosphor 112, 212 Discharge gas space

Claims (4)

[Claims] 1. A front panel having a surface discharge electrode group composed of a pair of scan electrodes and sustain electrodes and a first black partition formed on a front substrate, and a data electrode for writing data on the rear substrate. And a rear panel having a white second barrier rib formed therein, wherein the first barrier rib and the second barrier rib are arranged to face each other to form a discharge chamber. The plasma display panel is characterized in that the width of the barrier ribs is wider than the width of the first barrier ribs. 2. The plasma display panel according to claim 1, wherein at least a top portion of the second partition wall is coated with a phosphor. 3. The difference between the width of the second partition wall and the width of the first partition wall is 60% or less of the distance between adjacent first partition walls. Plasma display panel. 4. The total height of the first partition wall and the second partition wall is 70 μm or more and 250 μm or less, and the height of the first partition wall is 10 μm or more and 50 μm or less. The plasma display panel according to claim 1, which is characterized in that.