JP2003036792A - Surface discharge type plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface discharge type plasma display device which is capable of obtaining high brightness and producing discharging light-emission display with relatively small power consumption even if making the size of a display panel large. SOLUTION: In this surface discharge type plasma display device, each line electrode in line electrodes pair is formed with a body portion extended in the horizontal direction and a protrusion protruded from the body portion in the vertical direction at every discharging light-emission picture-element region. Here, each protruded portion is formed with a top portion having a prescribed first width in the horizontal direction and a single narrow portion which connects the top portion to the body portion and has a second width narrower than the first width in the horizontal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface discharge type plasma display device.

[0002]

2. Description of the Related Art In recent years, a surface discharge type AC plasma display device is expected as a large and thin color display device. Most of the surface discharge plasma display devices have a three-electrode structure. In this type of plasma display device, two substrates, that is, a front glass substrate and a rear glass substrate are arranged to face each other with a predetermined gap. A plurality of row electrode pairs that are paired with each other are formed on the inner surface (the surface facing the back glass substrate) of the front glass substrate as the display surface. A plurality of column electrodes coated with phosphor are formed on the rear glass substrate. When viewed from the display surface side, the intersection of one row electrode pair and one column electrode is a pixel cell corresponding to one pixel.

Here, if an attempt is made to increase the size of the display in such a plasma display device, the respective row electrodes and column electrodes also become large accordingly. However, as the size of the electrode increases, the electrode area also increases, so that the amount of current supplied to the electrode also increases in proportion to the electrode area, which causes a problem of increased power consumption. Further, since the temperature of the plasma display panel rises due to the increase in power consumption, there is a problem that defective addresses of pixel cells are likely to occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to obtain a discharge light emission display with high brightness and relatively low power consumption even if the size of the display panel is increased. The present invention has been made for the purpose of providing a possible surface discharge type plasma display device.

[0005]

A surface discharge type plasma display device according to the present invention is provided with a plurality of row electrode pairs formed to extend in parallel to each other in the horizontal direction, and to face the row electrode pairs with a space therebetween. A plurality of column electrodes formed to extend in parallel to each other in the vertical direction, and a surface discharge plasma in which a discharge light emitting pixel region is formed at each intersection of the row electrode pair and the column electrode. In the display device, each of the row electrodes in the row electrode pair has a body portion that extends in the horizontal direction, and a protrusion that protrudes vertically from the body portion in the discharge light emitting pixel region, The protrusion has a single second width that connects the distal end and the main body and has a second width that is narrower than the first width. It consists of the narrow part of.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A surface discharge type plasma display device according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 represents a pixel cell of a surface discharge type AC plasma display device having a three-electrode structure.
Is formed on the rear substrate 12 in order to maintain a gap between the rear substrate 12 and the transparent front substrate 14 made of glass, which face each other in parallel with a gap of 100 to 200 μm, for example. The partition 16 is formed. Then, each of the spaces surrounded by the front substrate 14, the rear substrate 12, and the barrier ribs 16, 16 adjacent to each other is defined as a discharge space 18.

The front substrate 14 serves as a display surface of the plasma display device. On the surface of the front substrate 14 facing the rear substrate 12, the row electrodes Xi and Yi (i = i = i = i = i = i = i = i (i = i), which extend in parallel with each other and serve as a pair of sustain electrodes. 1, 2, ..., N) include a plurality of row electrode pairs, such as ITO or tin oxide (Sn).
O) or the like is formed in a horizontal direction with a film thickness of about several hundred nm. Further, a dielectric layer 20 is formed with a film thickness of about 10 μm so as to cover these row electrode pairs,
Magnesium oxide (MgO) is formed on the dielectric layer 20.
A MgO layer (not shown) made of is laminated in a film thickness of about several hundred nm.

The partition wall 16 has a row electrode pair Xi on the rear substrate 12.
, Yi, that is, in a direction orthogonal to Yi, that is, in the vertical direction, a plurality of films are formed in parallel with each other, for example, at intervals of 380 μm using, for example, thick film printing technology. The interval between the partition walls is not limited to 380 μm, and can be changed to an appropriate value depending on the size of the plasma display panel that is the display surface and the number of pixels.

A column electrode 22 serving as an address electrode is formed in the vertical direction across the rear substrate 12 between the adjacent partition walls 16, 16. The column electrode 22 is made of, for example, aluminum (Al) or an aluminum alloy, and is formed to extend vertically to the rear substrate 12 with a film thickness of about 100 nm while facing the row electrode pair Xi and Yi. Since the column electrode 22 is formed of a metal having a high reflectance such as Al or an Al alloy, it has a reflectance of 80% or more in the wavelength band of 380 to 650 nm.

The column electrodes 22 are not limited to Al and Al alloys, but can be made of an appropriate metal or alloy such as Cu or Au having a high reflectance. Therefore, the row electrode pair X
A light emitting pixel region P centered on the intersection of i, Yi and the column electrode 22 is formed in the discharge space 18. As described above, the surface substrate 1 on which the row electrode pairs Xi, Yi and the column electrodes 22 are formed
4 and the rear substrate 12 are sealed, the discharge space 18 is evacuated, and the moisture on the surface of the MgO layer is removed by baking. Next, the discharge space 18 is filled with 200 to 600 torr of an inert mixed gas containing 1 to 10% of xenon (Xe) as a rare gas.

When performing color display in the plasma display device, for example, phosphors corresponding to the three primary colors R, G, B of light are directed downward from above the rear substrate 12 so as to cover each column electrode 22. The film may be sequentially formed as a light emitting layer. In this way, the pixel cell 1 capable of emitting light
0 is formed, and in each discharge space 18, a row electrode pair Xi, Y is formed.
The pulse voltage applied to the three electrodes of i and the column electrode 22 starts, maintains, and erases the discharge of the pixel cell centered on the light emitting pixel region P.

Next, the shapes and dimensions of the row electrodes Xi and Yi will be described. FIG. 2 is a diagram showing an example of the shape of the row electrode pair Xi, Yi. In FIG. 2, the row electrode pair Xi, Y
One of the row electrodes Xi of i has a body portion 30 that extends in the horizontal direction in each light emitting pixel region, and a direction that extends from the body portion 30 to the other row electrode Yi and that intersects with the extension direction of the body portion 30. And a projecting portion 32 projecting to the outside. Further, the other row electrode Yi similarly has a main body portion 30 that extends in the horizontal direction in each light emitting pixel region and an extending direction of the main body portion 30 from the main body portion 30 toward the protruding portion 32 of the one row electrode Xi. Comprises a protruding portion 32 protruding in the intersecting direction. Therefore, the protrusions 32, 32 of the two-row electrodes Xi, Yi are
Of the respective end portions 34 face each other with a predetermined gap ge therebetween. The protrusion 32 preferably protrudes in a direction orthogonal to the extending direction of the main body 30, that is, in the vertical direction.

Next, the dimensions of the respective portions of the row electrodes Xi and Yi will be shown. The length in the longitudinal direction of the main body portion 30 in one discharge space (corresponding to the distance between the line segments AA and BB in the figure) corresponds to the interval between the partition walls 16 and is 380 μm. As shown in FIG. 2, when the length of the protrusion 32, that is, the total width of the main body 30 and the length of the protrusion 32 in the longitudinal direction is le, and the width of the tip of the protrusion is w1, le and w1 The length of is as follows.

Le = 400 μm to 1000 μm w1 = 200 μm to 250 μm As the dimensions of le and w1, le is 700 μm,
The w1 is preferably 200 μm. Furthermore, when le and w1 are set to have a length within the above-described range, the dimensions of the other portions are preferably the vertical length L of the light emitting pixel region being 1.
300 μm, the gap ge between the paired row electrodes Xi and Yi is 70 μm, and the width lb of the body portion 30 of the row electrodes Xi and Yi is 1
It becomes 00 μm.

Next, the luminous efficiency in the case where the pixel cell 10 using the row electrode pair Xi, Yi having the above-described structure is caused to emit green light will be described with reference to FIG. FIG. 3 shows the protrusion 32 when the width w1 of the tip 34 of the protrusion 32 is 200 μm.
Of the voltage applied to the pixel cell 180 is 180V, 190V, 200
It is shown in place of V. In FIG. 3, the curve α1
, Α2, α3 are values when the voltages applied to the respective pixel cells 10 are 180V, 190V and 200V. Luminous efficiency is high regardless of the value of the applied voltage.
When the length le of 2 is from 200 μm to 700 μm, it increases as the length of le increases, the maximum luminous efficiency is exhibited when le is 700 μm, and the luminous efficiency gradually decreases when le exceeds 700 μm. Therefore, in order to maximize the luminous efficiency of the pixel cell 10, it is preferable to set le to 700 μm.

Further, the width w1 of the tip portion 34 of the protrusion 32 of the row electrode when the row electrode pair Xi, Yi having the above-mentioned configuration is used.
And the discharge start voltage of the pixel cell 10 will be described with reference to FIG. FIG. 4 shows a change in the discharge start voltage when w1 is changed while the length le of the protruding portion is kept constant. The discharge start voltage decreases as w1 increases and becomes constant at 200 μm or more. Therefore, it is understood that w1 for minimizing the discharge start voltage of the pixel cell 10 is preferably 200 μm or more.

Therefore, in the row electrodes Xi and Yi, when the length le of the protrusion 32 is 700 μm and the width w1 of the tip 34 of the protrusion 32 in the horizontal direction is 200 μm, the luminous efficiency of the pixel cell 10 is improved. It becomes maximum and the discharge start voltage becomes minimum. That is, it is possible to suppress the power consumption of the plasma display device by reducing the discharge start voltage while maximizing the luminous efficiency.

In the above embodiment, the row electrodes Xi and Yi are used.
Although the width lb of the main body portion 30 is 100 μm, the width is not limited to this value, and the width of the main body portion 30 has a value within the range of 50 to 200 μm, the same effect as that of the above-described embodiment can be obtained. . Further, in the above embodiment, the row electrode pair Xi, Y
From both main body portions 30 of the row electrodes forming i
5 and the tip portions 34 of the projecting portions 32 face each other. However, as shown in FIG. 5, the projecting portions 32 project from both the main body portions 30 of the row electrodes Xi and Yi of the row electrode pair. Even if the protruding portions 32 are configured such that the protruding directions thereof are opposite to each other and away from each other, the same operational effect can be expected. In this case, the gap between the row electrodes preferably corresponds to the gap ge between the main bodies.

As shown in FIG. 6, the row electrode pair Xi,
One row electrode of Yi (row electrode Xi in the figure)
Alternatively, the protruding portion 32 may protrude only from the main body portion 30 and the other row electrode Yi may include only the main body portion 30. Also in this case, for example, the row electrodes Xi, Yi
The gap ge between them is 70 μm, and the width lb of the main body portion 30 is 100 μm.
It is preferably formed with a thickness of μm. Also in the configurations shown in FIGS. 5 and 6, the same effect as described above, that is, le
And the emission efficiency, and the relationship between w1 and the discharge start voltage are obtained, the emission efficiency is maximum when le is 700 μm, and the discharge start voltage is minimum when w1 is 200 μm or more. Therefore, in the row electrode Xi, the protrusion 3
2 has a length le of 700 μm and the tip 3 of the protrusion 32
When the horizontal width w1 of 4 is 200 μm, the discharge start voltage can be reduced and the power consumption of the plasma display device can be suppressed while maximizing the luminous efficiency.

FIG. 7A shows the row electrodes Xi and Y according to the present invention.
It is a figure which shows the shape of i from the upper surface. In FIG. 7 (a),
One row electrode Xi of the row electrode pair Xi, Yi extends in a direction intersecting with the body portion 30 extending in the horizontal direction and the extending direction of the body portion 30 from the body portion 30 toward the other row electrode Yi. And a protruding portion 32 that protrudes. Similarly, the other row electrode Yi protrudes in a direction intersecting with the extending direction of the main body portion 30 from the main body portion 30 extending in the horizontal direction and the protruding portion 32 of the one row electrode Xi from the main body portion 30. Protrusion 32
Consists of. Therefore, the protrusions 32 of the two-row electrodes Xi and Yi are
Respectively, the respective tip portions 34 project so as to face each other with a predetermined gap ge therebetween. The projecting direction of the projecting portion 32 is preferably a direction orthogonal to the longitudinal direction of the main body 30.

Further, the protruding portions 32 of the row electrodes Xi and Yi
As shown in FIG. 7 (a), the width in the horizontal direction of the portion excluding the tip end portion 34 is smaller than the width of the tip end portion 34 in the horizontal direction: w 1 and the single narrow width is w 2. It has a section 36. The dimensions of each part in this case are shown below. In FIG. 7A, the spacing between the partition walls is 380 μm, the width L of the row electrode pair Xi, Yi is 1030 μm, the width lb of the main body 30 is 100 μm, and the length le of the protrusion is 470 μm.
The width w1 of the tip portion 34 of the protrusion 32 is 200 μm, and the gap ge between the tip portions of the row electrode pairs Xi and Yi facing each other is 90.
μm, the narrow portion 36 starts from a position 80 μm away from the tip portion 34 of the projecting portion 32 toward the main body portion 30 and ends at the connecting portion with the main body portion 30, and the width w2 thereof is 80 μm.

FIG. 8 shows the row electrode X of the pixel cell 10 including the row electrodes Xi and Yi having the narrow portion 36 as shown in FIG. 7A.
It is a figure which shows the correspondence of the voltage which should be applied to i, Yi, and the light emission efficiency at the time of green light emission. For comparison,
The luminous efficiency of the pixel cell 10 including the row electrode pair Xi, Yi having the shape as shown in FIG. 7B in which the narrow portion 36 does not exist is also shown in FIG.

In FIG. 8, the curve βa shows the change in the luminous efficiency of the pixel cell including the row electrodes Xi and Yi having the narrow portions 36, and the curve βb shows the row electrodes Xi and Yi having no narrow portions 36.
3 shows a change in light emission efficiency of a pixel cell including a. With any of the electrode shapes, the luminous efficiency is 150
It rapidly decreases until it reaches V, but becomes almost constant when it exceeds 150V. In addition, the luminous efficiency is determined by the row electrode X.
It can be seen that they are almost the same regardless of the presence or absence of the narrow portion 36 of i and Yi.

FIG. 9 shows the narrow portion 36 as shown in FIG.
FIG. 6 is a diagram showing a relationship between an applied voltage applied to a pixel cell 10 including row electrodes Xi and Yi each having a cell and a discharge current per cell. For comparison, the narrow portion 36 does not exist in FIG.
The relationship between the applied voltage applied to the pixel cell 10 including the row electrode pair Xi and Yi having the shape shown in FIG. 9B and the discharge current per cell is also shown in FIG.

In FIG. 9, the curve βa is for the case where the row electrode having the narrow portion 36 is used, and the curve βb is for the case where the row electrode without the narrow portion 36 is used. When the applied voltage increases, the amount of current flowing through the pixel cell 10 increases in any case. However, it can be seen that the discharge current of the pixel cell having the narrow portion 36 is smaller than the discharge current of the pixel cell having no narrow portion 36 for any applied voltage. This is a row electrode Xi having a narrow portion 36.
, Yi has a smaller electrode area than the row electrodes Xi, Yi having no narrow portion 36, and therefore the amount of current flowing through the electrodes is smaller than that of the row electrodes Xi, Yi having no narrow portion 36. This is because.

Therefore, referring to FIGS. 8 and 9, the protrusion 32
The discharge current amount is reduced by the narrow portion 36 formed in the pixel cell 1. Therefore, compared with a pixel cell having a row electrode without the narrow portion 36, the pixel cell
It can be seen that the power consumption of 0 can be reduced. Therefore, the heat generation amount of the pixel cell 10 can be reduced. in this way,
At least one row electrode of the pair of row electrode pairs Xi and Yi has a body portion 30 extending horizontally and a body portion 3
And a narrow portion 36 that is narrower than the width of the tip portion 34 in the horizontal direction in a portion excluding the tip portion 34 of the protrusion portion 32.
By forming the light emitting element, the discharge efficiency is reduced while maintaining the light emission efficiency as in the case without the narrow portion 36.
The power consumption per pixel cell can be reduced.

The shape and dimensions of the narrow portion 36 are shown in FIG.
The configuration is not limited to that shown in FIG. From the above description, the luminous efficiency, regardless of the presence or absence of the narrow portion 36, is the longitudinal direction of the protruding portion 32 including the length of the protruding portion 32 in the vertical direction of the main body portion 30, that is, the length in the vertical direction, and the protruding portion 3.
It can be seen that it is determined depending on the horizontal width of the second tip portion 34. Therefore, if the protrusion 32 has the length le in the longitudinal direction and the width w1 in the horizontal direction of the tip end portion thus determined, the narrow portion 36 has a portion of the tip end portion other than the tip end portion of the protrusion portion. It is only necessary to have a region narrower than the width in the horizontal direction, and the presence of this narrow portion 36 reduces the amount of discharge current per pixel cell.

Therefore, the protrusions 3 of the row electrodes Xi and Yi are provided.
As the shape of 2, the shape shown in FIG. 10 (a) or FIG. 10 (b) may be adopted. In the narrow portion 36 shown in FIG. 10A, the inner portion of the protruding portion 32 is removed along the longitudinal direction thereof, and in the narrow portion 36 shown in FIG. 10B, the protruding portion 32 is horizontal toward the tip portion 34. The width in the direction is gradually narrowed, and the inner portion of the protruding portion 32 is removed along the longitudinal direction.
That is, on the surface of the protruding portion 32, in order to form a region (narrow portion 36) having a width narrower than the width of the tip portion in the horizontal direction in the portion excluding the tip portion thereof, FIGS. Through holes are provided as shown in b).

The shape of the protrusions 32 of each of the row electrodes Xi and Yi is as shown in FIG. 11 (a) or FIG. 11 (b), FIG. 12 (a).
Alternatively, the one shown in FIG. 12 (b) may be adopted. Figure 11
The protruding portion 32 shown in (a) has a rectangular shape in the vicinity of its tip, and the width in the horizontal direction at the end of this rectangular shape is narrower than that of the tip, and the width in the horizontal direction toward the main body 30 is small. It has been gradually expanded. Further, in FIG. 11B, the narrow portion 36 exists only in one region in the longitudinal direction of the projecting portion 32.

The row electrode pair Xi, Y shown in FIG.
In the light emitting pixel region, i is a body portion 30 ′ that extends in the horizontal direction, a protrusion portion 32 ′ that vertically protrudes from the body portion 30 ′ toward the other row electrode, and a tip portion of the protrusion portion 32 ′. Opposed extension 3 that is connected and extends in the horizontal direction
8 and. The facing extension 38 is connected to the facing extension of the horizontally adjacent light emitting pixel regions. The row electrode pairs Xi and Yi shown in FIG.
Similarly to the above, in the light emitting pixel region, a main body portion 30 ′ that extends in the horizontal direction, two protruding portions 32 ′ that vertically project from the main body portion 30 ′ toward the other row electrode, and a protruding portion 3 are provided.
2'includes a facing extension portion 38 that is connected at the front end portion and extends in the horizontal direction. Further, each of the protrusions 32 'is connected to the protrusion of the adjacent light emitting pixel region in the horizontal direction.

[0031]

According to the present invention, since the amount of current flowing through each electrode, including the amount of discharge current, is reduced, the power consumption per light emitting pixel region can be reduced. Therefore, the amount of heat generated per unit area of the plasma display device is reduced, so that it is possible to prevent address defects in the light emitting pixel region due to heat generation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a pixel cell of a plasma display device according to the present invention.

FIG. 2 is a top view showing an example of the shape of a row electrode pair.

FIG. 3 is a graph showing the relationship between the length le of the protrusion and the luminous efficiency.

FIG. 4 is a graph showing the relationship between the discharge start voltage and the width w1 of the tip of the protrusion.

5 is a top view showing a row electrode pair having a shape different from that of the row electrode pair shown in FIG. 2. FIG.

6 is a top view showing a row electrode pair having a different shape from the row electrode pair shown in FIGS. 2 and 5. FIG.

7 is a top view showing a shape of a row electrode pair including a protrusion 32 having a single narrow portion 36 and a shape of a row electrode including a protrusion 32 having no narrow portion. FIG.

8 is a graph showing a relationship between applied voltage and luminous efficiency in each of the row electrodes shown in FIG.

9 is a graph showing the relationship between the applied voltage at each of the row electrodes shown in FIG. 7 and the amount of discharge current per pixel cell.

FIG. 10 is a top view showing the shape of a row electrode pair provided with a protrusion 32 having a through hole.

FIG. 11 is a top view showing another shape of the row electrode pair including the protrusion 32 having the narrow portion 36.

FIG. 12 is a top view showing another configuration of the row electrode pair.

[Explanation of symbols for main parts] 10 pixel cell 22 row electrodes 30 body 32 protrusion 36 Narrow part Xi and Yi row electrodes

Claims (5)

[Claims] 1. A plurality of row electrode pairs formed to extend in parallel to each other in a horizontal direction, and a plurality of row electrode pairs formed to extend to be parallel to each other and spaced apart from the row electrode pair. A surface discharge type plasma display device having a column electrode, wherein a discharge light emitting pixel region is formed at each intersection of the row electrode pair and the column electrode, each of the row electrodes in the row electrode pair. Has a main body extending in the horizontal direction and a protrusion protruding vertically from the main body in the discharge light emitting pixel region, and the protrusion has a predetermined first width in the horizontal direction. Surface discharge type, characterized in that it comprises a front end portion of the first end portion, and a single narrow portion of the second width that connects the front end portion and the main body portion and has a width in the horizontal direction that is narrower than the first width. Plasma display device. 2. The surface discharge type plasma display device according to claim 1, wherein the width of the tip of the protrusion in the horizontal direction is in the range of 200 μm to 250 μm. 3. The back substrate further comprising: a front substrate having a plurality of the row electrode pairs formed thereon; and a back substrate facing the front substrate through a discharge space in the discharge light emitting pixel region. 2. The surface discharge type plasma display device according to claim 1, further comprising a partition for partitioning each of the discharge light emitting pixel regions. 4. The surface discharge type plasma display device according to claim 1, wherein the vertical length of the protrusion is longer than the vertical length of the main body. 5. A front substrate and a rear substrate which are arranged to face each other through a discharge space, a plurality of row electrode pairs formed on the front substrate so as to extend in parallel to each other in the horizontal direction, and the rear substrate. A plurality of column electrodes extending in parallel to each other in the vertical direction, and a discharge light emitting pixel region including the discharge space is formed at each intersection of the row electrode pair and the column electrode. In the surface discharge plasma display device, each of the row electrodes in the row electrode pair has a body portion extending in the horizontal direction and a protrusion protruding vertically from the body portion in the discharge light emitting pixel region. The protrusion has a first width having a predetermined width in the horizontal direction, the protrusion connects the tip and the main body, and the width in the horizontal direction is narrower than the first width. Second width single Surface discharge type plasma display device comprising: the narrow section, that it consists characterized.