JPH10247458A - Gas discharge type display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the desired intensity on red, blue, and green colors, keep white balance, and display three colors at 256 gradations by setting the heights of shapes of the phosphor faces of individual colors on a back plate glass so that the green phosphor face is made low and the other red and blue phosphor faces are made higher than the green phosphor face. SOLUTION: In this gas discharge type display device (PDP), for color display the phosphor faces 6 formed in the barrier ribs 3 of a back plate glass 2 have shapes different in height among the red, blue, and green colors. Since the green color tends to be the brightest among the red, blue, and green colors, a surface exposure mask is light-shielded not to apply a surface exposure to the portions of the green color, and the shapes of the phosphor faces 6 of the green color are made low in height to match the intensity of three colors. Ultraviolet rays are radiated to the red and blue phosphor faces 6 through proper slits, respectively, and the desired heights of these phosphor faces 6 are realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a so-called color display gas discharge type display device and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a gas discharge type display (PDP) for color display has been put to practical use as a color display used for a display device of OA equipment such as a home television receiver and a personal computer. Is required.

[0003] For example, a DC discharge type display device (hereinafter referred to as DC-
The color display of PDP) uses a gas that emits ultraviolet light, such as a mixed gas of helium and xenon, as a discharge gas, and uses the ultraviolet light to emit red (R), green (G), and blue (B) phosphor surfaces. Is performed by exciting.

The driving method uses a pulse memory method. For gradation display, eight sub-fields are provided in one field of each cell.
It is possible to obtain an image with a maximum of 256 gradations for each color by combining the subfields with each other. as a result,
Theoretically, 16.7 million colors can be displayed in full color.

A conventional color PDP shown in the schematic sectional view of FIG. 6 and the schematic perspective view of FIG. 7 uses a thick film process. That is, the front glass sheet 1 and the rear glass sheet 2 are opposed to each other with a partition wall 3 formed of a glass paste by a printing method, and a gap between the cathode 4 and the anode pad 5 in the unit discharge cell surrounded by the partition wall 3 is formed. Next, the phosphor surface 6 is formed in a desired shape using a technique such as photolithography. By repeating those steps, a three-dimensional structure can be created.

Conventionally, as a process for forming a phosphor surface of each color in a color PDP, a method using photolithography has been known. For example, in the case of a color DC-PDP, a monochromatic phosphor paste containing an ultraviolet curable resin is filled in the cells formed by the partition walls 3 by a screen printing method and dried, and then, the surface opposite to the cell forming surface of the rear glass plate 2 Then, ultraviolet light is irradiated by a self-alignment exposure method using the anode pad 5 itself as a mask to cure the exposed portions other than the anode pad 5. Next, development is performed to remove the unexposed portions, thereby forming the phosphor surface 6 and securing the discharge space 7. In addition, there is photolithography using a photoresist or the like, but it has been difficult to control the shape of the phosphor surface of each of red, blue, and green.

[0007]

However, when the phosphor surface is formed by such a conventional method for forming a phosphor surface, the shape of the phosphor surface of each color becomes almost the same, and the following problem occurs. I was

That is, even when the same subfield is displayed, the balance of the luminance of each color is lost. For example, in a conventional PDP, pixels of the panel are configured such that a ratio of a green cell 2 to a red cell 1 and a blue cell 1 is high. Therefore, it is necessary to suppress the green display luminance in order to obtain white balance. In addition, since the green phosphor itself has high luminous efficiency, it is necessary to suppress green display luminance. For example, if each of the red, blue, and green phosphor screens is displayed at full scale with an input voltage of 0 to 1 V, the red and blue phosphor screens are illuminated at the maximum luminance (256 gradations) for an input of 1 V. However, for example, an appropriate white balance cannot be obtained on the green phosphor surface unless the amount of light is half (128 gradations). In this case, it is impossible to display 256 gradations of green color, which makes it impossible to display 16.7 million full-color colors.

As described above, according to the conventional method of forming the phosphor surface of each color, there has been no other method than to obtain a white balance by suppressing the display luminance of green in the PDP.

Further, in the above-mentioned self-alignment exposure method, there is a problem that the shape of the phosphor surface varies depending on the shape of the anode pad formed on the back plate glass and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to achieve desired luminance of each of red, blue, and green colors and achieve a white balance. Another object of the present invention is to provide a color PDP capable of forming a phosphor surface capable of achieving 256 gradations for all three colors.

[0012]

According to the present invention, in order to achieve the above object, the shape of the phosphor surface of the back plate glass is red,
Blue, green, different configurations in each color cell, especially the height of the shape of the phosphor surface of each color is low in the green phosphor surface, the configuration of the other red and blue phosphor surface is higher than the green phosphor surface. Have

According to the present invention, at the stage of forming the phosphor surface,
By controlling the shape of the phosphor surface, green can be displayed in 256 gradations at full scale.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the sectional view of FIG.

As shown in FIG. 1, the PDP of the embodiment is
The phosphor surface 6 formed in the partition wall 3 of the back plate glass 2 is red,
Each of the blue and green colors has a different height.

Next, a method for forming a phosphor surface according to the embodiment will be described. The partition 3 previously formed on the rear glass plate 2
A phosphor paste made of three types of ultraviolet curable resins including phosphors of red, blue and green is individually filled by a screen printing method. Next, the substrate is dried to remove the solvent contained in the phosphor paste. Then, using an exposure machine, 4 mm from the front side of the glass
Irradiation at 0 mJ / cm ² , and a mask having the pattern shown in FIG. 2 (red: 0.003 mm, blue: 0.006 mm slit width, green: green) Irradiate 40 mJ / cm ² through the light-shielding) to cure the exposed portion. The development is performed using water to remove unexposed portions. Through the above steps, the red, blue, and green phosphor surfaces can be formed on the back plate glass 2 in desired shapes.

Here, the red, blue, and green phosphor surfaces were each formed into a desired shape by computer simulation. FIG. 3 shows a conceptual sectional view by simulation.
First, in order to derive the relationship between the shape of the phosphor surface and the luminance, FIG.
The relationship between the height of the phosphor surface and the brightness was calculated for the two phosphor surface shapes a and b shown in FIG. The calculation results are shown in the characteristic diagram of the simulation in FIG. From this calculation result,
By increasing the height of the phosphor surface and approaching the shape b, high luminance can be obtained.

Next, a method for realizing the ideal shape was examined. After printing, the phosphor surface is filled up to the upper edge of the partition. Therefore, it has been found that the shape before exposure must be close to the curved shape of the surface in order to realize a sufficient opening, a higher height, and a shape b. This shape was achieved by adjusting the solvent component in the phosphor paste and optimizing the drying conditions.

The color PDP of this embodiment includes red, blue,
Of the green colors, green tends to be the brightest. Therefore, in order to match the luminances of the three colors, the surface exposure mask is shielded from light so that the green color is not exposed to the surface, and the height of the phosphor surface is reduced. In addition, each of the red and blue phosphor surfaces is irradiated with UV light through an appropriate slit,
A desired phosphor surface height is achieved. As a result, white balance can be obtained without adjusting the luminance in all colors. Of course, 256 gradations can be displayed in all colors, and 16.7 million full-colors can be displayed.

As another structure that produces the same effect, as shown in the cross-sectional view of FIG. 5, utilizing the relationship between the shape of the phosphor surface and the luminance seen in FIG. In order to lower the luminance, the cross-sectional shape is a linear taper that increases from the rear glass plate side to the front glass plate side (a shape in FIG. 3). The red and blue phosphor surfaces gradually expand toward the front plate and have a parabolic shape curved toward the rear plate (b shape in FIG. 3). Needless to say, these effects can also be obtained in a so-called AC-PDP stripe structure used for an AC-PDP.

Further, by applying the front exposure, the variation between cells of each color was reduced as compared with the conventional self-alignment method using the anode pad 5 as a mask. This is because the anode pad 5 becomes a mask as it is,
This is because the variation in the shape of the pad affects the influence and the ultraviolet light is also cut by the shape of the resistor provided in addition to the anode pad 5, so that the variation in the shape of the resistor also influences. These effects can be reduced by shining ultraviolet light from the front side of the back glass.

[0022]

As described above, according to the present invention,
By adjusting the shape of the phosphor surface of each color of red, blue, and green to different shapes, brightness is adjusted, white balance is achieved, and 256 colors can be displayed in each color.
A gas discharge display device capable of displaying 6.7 million colors can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas discharge type display device according to an embodiment of the present invention.

FIG. 2 is a schematic view of a front exposure mask used in an embodiment of the present invention.

FIG. 3 is a conceptual cross-sectional view by simulation explaining the present invention.

FIG. 4 is a characteristic diagram based on a simulation explaining the present invention.

FIG. 5 is a sectional view of a gas discharge type display device according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional gas discharge display device.

FIG. 7 is a detailed perspective view of a conventional gas discharge type display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front glass 2 Back glass 3 Partition wall 4 Cathode 5 Anode pad 6 Phosphor surface 7 Discharge space

Claims (6)

[Claims] A first electrode group disposed on a first substrate, a second electrode group disposed on a second substrate facing the first substrate in a plane, and wherein the first electrode group is disposed on the first substrate; A second substrate is opposed to and held by a partition wall to form a discharge space group in a gap between the first electrode group and the second electrode group, and the discharge space group is selectively discharged to emit ultraviolet light. And the second
In a gas discharge type display device that emits a phosphor surface of each color formed by separately coating each phosphor of red, blue, and green on a part of the substrate, and performs image information display, the red, blue, and green A gas discharge display device characterized in that at least one of the shapes of the phosphor planes of each color is different from the shapes of the phosphor planes of the other two colors. 2. The gas discharge according to claim 1, wherein the height of the shape of each color phosphor surface is lower on the green phosphor surface and higher on the other red and blue color phosphor surfaces than the green phosphor surface. Type display device. 3. The gas discharge type display device according to claim 1, wherein the cross-sectional shape of each color phosphor surface gradually expands toward the first substrate and is formed in a curved parabolic shape. 4. The gas discharge type display device according to claim 1, wherein the phosphor surfaces of red, blue and green are formed by photolithography using a phosphor paste containing an ultraviolet curable resin. 5. The process of controlling the amount of light irradiated between the phosphors of each color during exposure in a process in which phosphor surfaces of red, blue and green are formed by photolithography using a phosphor paste containing an ultraviolet curable resin. A method for manufacturing a gas discharge type display device, comprising using a mask which performs the above. 6. A process in which phosphor surfaces of red, blue, and green are formed by photolithography using a phosphor paste containing an ultraviolet curable resin, both surfaces of a substrate on which phosphor surfaces of respective colors are formed at the time of exposure. A method for manufacturing a gas discharge type display device, comprising irradiating light from a substrate.