JP2003068210A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel of which differences of discharge characteristics between discharge cells of red, green and blue is small and color temperature is high. SOLUTION: The plasma display panel has plural pixels composed of a combination of discharge cells emitting colored light of red, green and blue. The discharge cells are formed with a front and a back glass substrates 1 and 5, respectively, opposed each other to form a discharge space between the substrates, partitions 13 formed on the back glass substrate 5 to separate the discharge space into plural spaces, electrodes formed inside the discharge spaces separated by the partitions 13 to discharge electrons, fluorescent layers 14, 15 and 16 that emit colored light of red, green and blue, respectively, as the electrodes discharge electrons. The number of cells of at least one color is different from others.

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 displaying images on a television or the like.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are alternating current type (AC type), respectively.
3 is a schematic perspective view and a cross-sectional view showing the outline of the plasma display panel of FIG. In the plasma display panel shown in FIGS. 5 and 6, the display electrode 2 is formed on the front glass substrate 1, and the entire surface thereof is covered with the dielectric layer 3 and the protective layer 4.

On the other hand, an address electrode 6 is formed on the rear glass substrate 5, the entire surface of the address electrode 6 is covered with a dielectric layer 7, and a partition 8 is formed thereon. Then, in each space sandwiched by the partition walls 8, a phosphor paste of each color including a red phosphor, a green phosphor, and a blue phosphor is arranged, whereby the phosphor layer 9 is formed.
~ 11 are formed.

The substrates thus formed are bonded to each other so that a discharge cell group is formed in a region surrounded by the barrier ribs 8, and a Ne-Xe mixed gas is sealed in the discharge space 12 formed thereby. It is configured by

The plasma display having such a structure has a vacuum ultraviolet light (147) having a short wavelength generated by discharge.
(nm) to excite the phosphor layers 9 to 11 and emit red, green, and blue visible light from the red, green, and blue discharge cells, respectively, from the front glass substrate 1 side to perform color display.

In the conventional plasma display panel, the barrier ribs 8 are provided at equal intervals as shown in FIG. 6, so that the red, green and blue discharge cell groups have the same width. In such a configuration, if the chromaticity of white display is not the desired chromaticity due to low color temperature, red,
It is possible to adjust the level of the input signal of the discharge cell to each of green and blue to set the chromaticity of the white display of the panel to an appropriate value.

However, in the case of such means for adjusting the level of the input signal, there is a problem that the gradation display quality is significantly deteriorated at the same time.

In order to solve this, for example, the barrier ribs 8 are arranged at unequal intervals, and the phosphor layers 9 to 9 of the discharge cells of each color are formed.
A method in which the width of 11 is different (Japanese Patent Laid-Open No. 10-308
179) is being considered. According to this method, it is possible to set the chromaticity of white display to a desired chromaticity without degrading the gradation display quality, and it is possible to obtain a plasma display panel having a high color temperature.

[0009]

However, when the widths of the discharge cells of the respective colors are made different as in this method, as shown in FIG.
As shown in, the difference in the discharge characteristics of the discharge cells of each color increases. The curve shown in FIG. 7 shows the relationship between the cell applied voltage (wall voltage + external applied voltage), that is, the voltage applied to the discharge cell and the change amount of the wall voltage representing the magnitude of discharge. 2 is a discharge characteristic curve of an AC type PDP capable of quantifying the relationship between a discharge phenomenon and a discharge cell structure. Therefore, this wall voltage transfer curve can be used for designing drive waveforms such as optimization of drive conditions.

In the first place, even when the discharge cells of the respective colors have the same width, there are differences in the discharge characteristics of the discharge cells of the respective colors due to the different materials of the red, green and blue phosphors. However, even with the same phosphor material, if the width of the discharge cell is different, the discharge characteristics will be different,
When the widths of the discharge cells of the respective colors are made different, the difference in the discharge characteristics of the discharge cells is widened due to the difference in the cell shape. The large difference in the discharge characteristics of the discharge cells of each color as shown in FIG. 6 means that the optimum drive condition differs for each discharge cell of each color, and as a result, the margin of the drive voltage becomes narrow. It means that.

The present invention solves such a problem, and an object thereof is to provide a plasma display panel having a small difference in discharge characteristics between discharge cells of red, green and blue colors and having a high color temperature. .

[0012]

In order to achieve this object, the present invention provides a pair of substrates, at least the front side of which are transparent so as to face each other so that a discharge space is formed between the substrates, and a plurality of the discharge spaces. A partition for partitioning is arranged on at least one of the substrates, and an electrode group is arranged on the substrate so that discharge is generated in the discharge space partitioned by the partition, and red, green, and blue fluorescent light emitted by discharge are emitted. A body is provided to form a plurality of discharge cells, the red color of which is
In a plasma display panel having a plurality of pixels formed by combining discharge cells that emit green and blue light, among the discharge cells forming the pixels, at least the number of discharge cells of one color is equal to the number of discharge cells of another color. It has a different configuration.

According to the present invention as described above, red, green,
It is possible to provide a plasma display panel having a small difference in discharge characteristics between discharge cells of blue color and a high color temperature.

The invention according to claim 2 of the present invention is
In the discharge cells forming the pixel, the discharge cells of the same color are adjacent to each other with the barrier ribs interposed therebetween.

The invention according to claim 3 of the present invention is
The width of the partition between adjacent discharge cells of the same color is narrower than the width of the partition between adjacent discharge cells of different colors.

Further, according to a fourth aspect of the present invention, among the discharge cells forming the pixel, the number of blue discharge cells is larger than the number of discharge cells of other colors.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A plasma display panel according to an embodiment of the present invention will be described below. First, an outline of a method for manufacturing a plasma display will be described, and later, characteristic points of the present invention will be described. In addition,
Such an embodiment does not limit the technical scope of the present invention.

FIG. 1 is a sectional view of a plasma display panel according to an embodiment of the present invention. The same parts as those of the conventional panel shown in FIGS. 5 and 6 are designated by the same reference numerals. Although only one pixel of discharge cells is shown in FIG. 1 for convenience, a plasma display panel is actually formed by arranging a large number of discharge cells that emit red, green, and blue colors.

First, the front plate will be described. An ITO film is formed on the entire surface of the front glass substrate 1 by a sputtering method, and then patterned by a photolithography method.
A transparent electrode of TO is formed. Next, after a photosensitive silver paste is formed on the entire surface, A
Form a bus electrode pattern on ITO and dry Ag.
The display electrode 2 is formed by firing (not shown, the Ag electrode is provided as a bus electrode on a transparent electrode of ITO).

A dielectric glass paste is applied thereover by a screen printing method and then baked to form a dielectric glass layer 3. Then, a MgO film is formed by a sputtering method, a vacuum evaporation method, or the like, and a protective layer 4 is formed on the entire surface of the dielectric glass layer 3 to manufacture a front plate.

Next, the back plate will be described. First, the address electrodes 6 are formed on the rear glass substrate 5 by the same method as the method of forming the Ag electrodes on the front plate. A dielectric glass layer 7 is formed thereon by screen printing as in the case of the front plate and panel. Then, the partition wall 1 is formed by a screen printing method, a sandblast method, or a photolithography method.
3 is formed.

In each space sandwiched by the partition walls 13, one of a red phosphor, a green phosphor, and a blue phosphor is arranged by a screen printing method, and the phosphor layer 14 is dried and baked. , 15, 16 are formed. For example, the following phosphors are used as the phosphors of red, green, and blue colors. Red phosphor: Y ₂ O ₃ : Eu ³⁺ Green phosphor: Zn ₂ SiO ₄ : Mn Blue phosphor: BaMgAl ₁ O ₁₇ : Eu ²⁺ Partition wall 13, phosphor layer 14, 15, which is a feature of the present invention. 1
The configuration of 6 will be described later.

After that, a sealing and sealing material layer made of low softening point glass is formed by a screen printing method or the like (not shown in the figure) to prepare a back plate.

The front plate and the back plate manufactured as described above are attached and sealed. After the sealing, the discharge space 12 partitioned by the barrier ribs 13 is evacuated, and then a discharge gas composed of Ne and Xe is sealed and aged to produce a plasma display panel.

At the time of driving the plasma display panel, as shown in FIG. 3, each driver and panel driving circuit 21 is connected to the plasma display panel to scan the scan electrode 22 and the address electrode 2 of the discharge cell to be lit.
After the voltage is applied for 4 times to perform the address discharge, a pulse voltage is applied between the scan electrode 22 as the display electrode and the sustain electrode 23 to perform the sustain discharge. Then, in the cell, ultraviolet rays are emitted with the discharge, and the phosphor layers 14 to 16 convert the light into visible light. In this way, the image is displayed by turning on the discharge cells of each color. In addition, 25 is a scanning electrode 22
A scan driver for applying a signal to the electrode 26 is a sustain electrode 2
3 is a sustain driver for applying a signal to 3, and 27 is a data driver for applying a signal to the address electrode 24.

Next, the constitution of the partition wall and the phosphor layer, which are the features of the present invention, will be described. As shown in FIG. 1, in this embodiment, the partition walls 13 are provided with the same width,
One pixel is composed of a discharge cell having a phosphor that emits red light, a discharge cell that emits green light, and two discharge cells that emit blue light. In addition, the two blue discharge cells are adjacent to each other with the partition wall 13 interposed therebetween.

Further, as shown in FIG. 1, the barrier ribs 13 are provided with the same width and the width of the discharge cells is the same for the discharge cells of each color, so that there is no difference in discharge characteristics due to the structure of the discharge cells. The difference in discharge characteristics between the discharge cells of each color is only the difference due to the difference in the phosphor material of each color. Therefore, the difference in the discharge characteristics of the discharge cells of each color can be reduced as compared with the case where the widths of the phosphor layers of the discharge cells of each color are made different by providing the partition walls at unequal intervals.

Here, FIG. 4 shows a schematic diagram of a chromaticity diagram of the xy color system. In FIG. 4, R (xr, yr), G (xg, y
g) and B (xb, yb) show the chromaticity coordinates of the luminescence of the red, green and blue phosphors of the plasma display panel. FIG. 4 shows that by controlling the emission brightness of the red, green, and blue discharge cells, it is possible to obtain the emission display of the color in the range surrounded by the triangle RGB. Also, red, green,
It is shown that when blue is displayed at the maximum brightness of a predetermined gradation, the maximum brightness of white display light emission of a predetermined gradation is obtained, and the chromaticity coordinate of this white display light emission is W1.

When the chromaticity of the white display light emission is not the desired chromaticity such as when the color temperature is low, the white display light emission is controlled to have a higher color temperature by controlling the light emission brightness of the red, green and blue discharge cells. High chromaticity can be set. For example, in order to move the chromaticity of the white display light emission from W1 to the coordinates of the chromaticity W2 having a higher color temperature in the direction of the blue chromaticity, for example, the emission brightness of blue may be increased.

In the present embodiment, since the number of blue discharge cells is larger than the number of red and green discharge cells, the ratio of blue light emission brightness to red and green light emission brightness is large. Since the chromaticity of white display light emission can be moved in the direction of bluer chromaticity, a plasma display panel having a high color temperature can be realized at the same time.

FIG. 2 shows a plasma display panel according to another embodiment of the present invention. The structure shown in FIG. 2 is similar to the structure shown in FIG. 1, but between two blue discharge cells. The width of the barrier rib 13 is narrower than the width of the barrier rib 13 between discharge cells of different colors adjacent to each other, which is different from the configuration shown in FIG.

Generally, when the width of the barrier ribs 13 is narrowed, the discharge of the adjacent discharge cells is ON even if one discharge cell is ON and the other discharge cell is OFF between the adjacent discharge cells. Due to the influence, erroneous discharge such as so-called crosstalk in which discharge cells that are turned off also turn on is likely to occur.

However, in the case of the configuration of the present embodiment, since it is expected that the two blue discharge cells will perform the same discharge display operation as each other, there is concern about the problem of erroneous discharge such as the above-mentioned crosstalk. do not have to. Therefore, it is significant in this respect that the discharge cells of the same color are adjacent to each other in one pixel. The reason why the width of the partition wall 13 between adjacent discharge cells of the same color is narrowed is also for the same reason. Since the emission brightness of each color increases as the width of each discharge cell increases, the width of the discharge cell can be increased by narrowing the width of the barrier ribs in this way. Therefore, in the case of the configuration shown in FIG. The emission brightness can be improved.

[0034]

As described above, according to the present invention, it is possible to provide a plasma display panel having a small difference in the discharge characteristics of red, green and blue discharge cells and a high color temperature.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing the structure of a plasma display panel according to another embodiment of the present invention.

FIG. 3 is a block diagram showing a plasma display device in which a driving circuit is connected to the plasma display panel.

FIG. 4 is an xy color system chromaticity diagram.

FIG. 5 is a schematic perspective view of an AC surface discharge type plasma display panel.

FIG. 6 is a schematic sectional view of an AC surface discharge type plasma display panel.

FIG. 7 is a schematic diagram of a wall voltage transfer curve in red, green and blue discharge cells of a plasma display panel.

[Explanation of symbols]

1 Front glass substrate 2 Display electrode 5 Rear glass substrate 6 address electrodes 12 discharge space 13 partitions 14 Red phosphor layer 15 Green phosphor layer 16 Blue phosphor layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masafumi Okawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Yoshiki Sasaki             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Takeshi Furukawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C040 FA01 FA04 GB03 GB14 GF02                       GF12 GG02 GG03 GG05 MA03                       MA17

Claims (4)

[Claims] 1. A pair of substrates, at least front side of which are transparent, are arranged opposite to each other so that a discharge space is formed between the substrates, and a partition wall for partitioning the discharge space into a plurality is arranged on at least one of the substrates. Disposing the electrode group on the substrate so that discharge is generated in the discharge space partitioned by the partition wall, and forming a plurality of discharge cells by providing a fluorescent substance that emits red, green, and blue to emit light by discharge, the red color, In a plasma display panel having a plurality of pixels formed by combining discharge cells that emit green and blue light, among the discharge cells forming the pixels, the number of discharge cells of at least one color is equal to the number of discharge cells of another color. A plasma display panel characterized by being different. 2. The plasma display panel according to claim 1, wherein, in the discharge cells forming the pixels, the discharge cells of the same color are adjacent to each other with a partition wall interposed therebetween. 3. The plasma display panel according to claim 1, wherein a width of a partition wall between adjacent discharge cells of the same color is narrower than a width of a partition wall between adjacent discharge cells of different colors. 4. The plasma display panel according to claim 1, wherein among the discharge cells forming the pixel, the number of blue discharge cells is larger than the number of discharge cells of other colors.