JPH08304803A - Plasma address display device - Google Patents

Abstract

(57) [Summary] [Object] To provide a plasma addressed display device capable of preventing liquid crystal display unevenness by minimizing gap unevenness of liquid crystal. A liquid crystal cell 2 and a plasma cell 3 are stacked with a dielectric sheet 4 in between, and a partition wall 5 in which a large number of plasma substrate glass 31 and the dielectric sheet 4 constituting the plasma cell 3 are provided in parallel. In the plasma address display device facing each other, the insulating rib 33 forming the partition wall 5 is
The laminated structure is composed of two or more insulating layers between the base end and the tip, and each insulating layer is made of a different material. In particular, the constituent material of the tip-side insulating layer 33a that constitutes the partition wall is mainly composed of glass that does not contain a filler or contains a filler having a fine particle diameter, and the constitution of the base-side insulating layer 33b. The material is mainly composed of glass containing a filler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma addressed display device in which a liquid crystal cell and a plasma cell are laminated via a dielectric sheet.

[0002]

2. Description of the Related Art In recent years, there has been proposed a plasma address display device in which a liquid crystal cell and a plasma cell are laminated via a dielectric sheet. FIG. 2 shows an example of the structure of this plasma addressed display device.

The plasma addressed display device of FIG. 2 has a flat panel structure in which a liquid crystal cell 2 and a plasma cell 3 are laminated with a dielectric sheet 4 in between. The liquid crystal cell 2 is bonded to the dielectric sheet 4 with the color filter substrate 21 having a predetermined gap with the liquid crystal sealing material 22 interposed therebetween. Although not shown, stripe-shaped data electrodes made of a transparent conductive material and extending in the row direction are formed in parallel on the inner surface of the color filter substrate 21 in the column direction (the vertical direction in the drawing). Color filter substrate 21 and dielectric sheet 4
A liquid crystal layer 23 is formed by filling liquid crystal in a gap between the liquid crystal layer 23 and Although not shown in FIG. 2, spacers are provided in the liquid crystal layer 23 in order to make the gap size uniform.

In the plasma cell 3, the plasma substrate glass 31 faces the dielectric sheet 4 with a predetermined gap. Plasma substrate glass 31 on the side of the dielectric sheet 4
A striped display electrode 32 made of nickel or the like is formed on the upper side of the display electrode 32. The striped display electrode 32 extends in the column direction and is formed in parallel with a predetermined gap in the row direction. Barrier ribs (insulating ribs) 33 having a width narrower than that of the display electrodes 32 are formed so as to overlap the display electrodes 32 at an equal pitch. The plasma substrate glass 31 is formed through the display electrodes 32 and the barrier ribs 33.
Are opposed to the dielectric sheet 4 with a predetermined gap.
The display electrode 32 and the barrier rib 33 form a partition wall 5, and the closed space defined by the partition wall 5 forms a plasma chamber 34.
Is configured as The plasma chambers 34 extend in the column direction and are formed at predetermined intervals in the row direction. The plasma chamber 34 is filled with an ionizable gas. As this gas, for example, helium, neon, argon or a mixed gas thereof is used. In this way, the display electrode 32 and the barrier rib 33 are separated by the plasma chamber 3
In addition to serving as a partition wall 5 that divides the plasma chambers 4, the plasma chamber 34 also serves as a gap spacer. The display electrodes 32 are connected to the drivers so as to alternately serve as the anode display electrodes 32A and the cathode display electrodes 32K. A ring-shaped frit seal 35 made of low-melting glass or the like is arranged around the plasma substrate glass 31, and the plasma substrate glass 31 and the dielectric sheet 4 are hermetically joined by the frit seal 35.

In the above plasma addressed display device, the data electrodes and the plasma chambers 34 are orthogonal to each other, the data electrodes serve as column drive units, the plasma chambers 34 serve as row drive units, and pixels are defined at the intersections thereof. . In such a plasma addressed display device, the anode display electrode 3
When a predetermined voltage is applied between 2A and the cathode display electrode 32K, the gas in the plasma chamber 34 is selectively ionized to generate plasma discharge, and the inside thereof is maintained at substantially the anode potential. In this state, when a data voltage is applied to the data electrode, the data voltage is written to the liquid crystal layer 23 of the pixels arranged in the column direction corresponding to the plasma chamber via the dielectric sheet 4. When the plasma discharge ends, the plasma chamber 34 becomes a floating potential, and the voltage written in the liquid crystal layer 23 of the corresponding pixel is held until the next writing period (for example, one frame later). At this time, the plasma chamber 34 functions as a sampling switch, and the liquid crystal layer 23 of each pixel functions as a sampling capacitor.

The data electrode 1 is provided for the liquid crystal layer 23 of each pixel.
Since the liquid crystal operates according to the data voltage written from 5, the display is performed in pixel units. Therefore, the liquid crystal layer 23 of a plurality of pixels arranged in the column direction is generated by generating plasma discharge.
By sequentially scanning the plasma chamber in which the data voltage is written in the row direction, a two-dimensional image can be displayed.

A method for manufacturing such a plasma addressed display device will be briefly described with reference to FIG.
As shown in (A), a display electrode pattern is printed on the plasma substrate glass 31 in a stripe shape by, for example, a screen printing method, and then dried to form a display electrode 32.

Next, the display electrodes 3 formed in stripes
The barrier rib 33 is screen-printed on the upper surface of FIG.
As shown in (B), they are laminated at an equal pitch. in this case,
The barrier rib 33 has a height of about 200 μm, so that the height is obtained by repeating screen printing and applying multiple layers. After printing the barrier ribs with a predetermined height, after firing, the upper portions of the barrier ribs are polished so that the barrier ribs have the same height.

Then, as shown in FIG. 3C, a ring-shaped frit seal 35 is formed around the plasma substrate glass 31.
This frit seal 3 is formed by using a dispenser, etc.
The dielectric sheet 4 made of glass via the barrier rib 33
It is bonded to the plasma substrate glass 31 in a state of being placed on the substrate. The dielectric sheet 4 is usually a thin glass plate having a thickness of about 50 μm. As a result, the area surrounded by the frit seal 35 is covered with the dielectric sheet 4 and the plasma substrate glass 3.
The upper and lower walls are 1 and the frit seal is a side wall, and the flat sealed chamber 36 is hermetically shielded from the outside. This sealed chamber 3
6 is evacuated and gas is injected. At this time, the thin glass plate 4 is brought into close contact with the upper end surfaces of the barrier ribs 33 to form the plasma chambers 34, respectively.

Next, an alignment treatment (not shown) is performed, and the alignment shown in FIG.
As shown in (D), spacers 24 for making the liquid crystal layer have a uniform thickness are dispersed, and as shown in FIG. 3 (E), the color filter 21 is attached to the dielectric sheet 4 via the liquid crystal sealing material 22. To form a liquid crystal chamber, and then liquid crystal is injected to obtain the plasma addressed display device shown in FIG.

By the way, the barrier ribs 33 are stacked by multi-layer printing, and the printing material of the barrier ribs 33 takes into consideration the suitability for printing, the expandability with glass, and the adhesion with the display electrode. A paste of lead glass mixed with a ceramic filler, a black pigment, etc. in a solvent is used.

[0012]

However, the tip end surface of the barrier rib 33, which is laminated and printed with the above-mentioned printing material and is polished, has considerable unevenness. Since the polishing method itself can polish the glass that constitutes the liquid crystal portion, a considerable degree of flatness can be expected. However, the actual barrier rib 33 is used.
As shown in the enlarged view of FIG. 4, the tip surface of the has unevenness of several μm. Such unevenness on the tip surface of the barrier rib 33 is
The thickness of the dielectric sheet 4 that adheres to the barrier ribs 33 is 50 μm.
Since it is a thin glass sheet of about m, as shown in FIG. 5, the thin sheet glass 4 bends along the irregularities of the barrier ribs 33, and as a result, a gap unevenness 23 ′ of the liquid crystal layer 23 is generated, and when an intermediate color is produced, The screen becomes uneven.

The present invention has been made in view of the above-mentioned circumstances, and the insulation which has the least possible unevenness on the tip end face while satisfying the conditions required for the insulating rib such as the printability and the adhesion to the display electrode. An object of the present invention is to provide a plasma addressed display device having a flexible rib.

[0014]

To achieve the above object, in a plasma addressed display device of the present invention, a liquid crystal cell and a plasma cell are laminated via a dielectric sheet, and a plasma substrate glass constituting the plasma cell. And a plurality of the dielectric sheets are opposed to each other through a partition wall provided in parallel, wherein insulating ribs constituting the partition wall are formed by two or more insulating layers between a base end and a front end. And a structure in which the respective insulating layers are made of different materials.

In this case, it is preferable that the constituent material of the tip side insulating layer which constitutes the partition wall and is in contact with the dielectric sheet has a denser structure than the constituent material of the base end side insulating layer. As described above, in order to make the upper side more dense than the lower side, the constituent material of the tip-side insulating layer that constitutes the partition wall is mainly composed of glass containing no filler, and the base-end side is The constituent material of the insulating layer preferably contains glass containing a filler as a main component.

Further, the constituent material of the tip-side insulating layer constituting the partition wall is mainly composed of glass and contains a filler having a particle diameter of 0.1 μm or less, and the base-end side insulating layer is constituted. It can also be realized by using a material whose main component is glass and which contains a filler having a particle size larger than 0.1 μm.

Further, the insulating ribs forming the partition walls are
The layers are preferably laminated by multi-layer printing.

[0018]

In the plasma addressed display device of the present invention, the insulating ribs forming the partition walls have a laminated structure of two or more layers, and the constituent materials of the respective insulating layers are different. It is possible to make the constituent material of the tip-side insulating layer that is denser than the constituent material of the proximal-side insulating layer, which makes the texture of the upper end surface after polishing finer and reduces unevenness. The liquid crystal display unevenness is reduced. Specifically, the constituent material of the proximal insulating layer that adheres to the display electrode is mainly composed of glass containing a filler, which has good printability, good adhesion to the electrode, and a coefficient of expansion close to that of glass. It is assumed that the above-mentioned object is achieved by using the constituent material of the tip-side insulating layer as a main component that does not contain a filler that has good adhesiveness to the base-side insulating layer and can obtain flatness by polishing. it can.

The same object can be achieved by making the filler of the upper insulating layer smaller in particle size than that of the lower insulating layer. Such a multi-layer structure of insulating ribs can be easily realized by a multi-layer printing laminated structure.

[0020]

Embodiments of the present invention will be specifically described below with reference to the drawings. As described above, in the plasma addressed display device of the present invention, the insulating rib forming the partition wall has a laminated structure of two or more layers between the base end and the tip, and each insulating layer is made of a different material. It is a thing.

Insulating rib (barrier rib) according to the present invention
An example of the structure of is shown in FIG. In this figure, a striped display electrode 32 is formed on a plasma substrate glass 31, and a barrier rib 33 is formed on the display electrode 32. The barrier rib 33 has a two-layer structure in this example, and is composed of an upper insulating layer 33a and a lower insulating layer 33b. The total height of these insulating layers is about 200 μm.
And the thickness of the upper insulating layer 33a is 10 to 40 μm.
m, especially about 20 to 30 μm is preferable.

The constituent materials of these insulating layers are such that the upper insulating layer 33a has a denser structure than the lower insulating layer 33b. Specifically, the adhesiveness and expansion of the upper and lower insulating layers are specifically made. From the characteristics, it is assumed that these main components are made of glass of the same quality and that the upper insulating layer 33a is not mixed with a filler or that a filler having a particle diameter of 0.1 μm or less is mixed, It is desirable that the lower insulating layer 33b be composed of a mixture of a filler having a large particle diameter. The type of glass is generally lead glass, but is not limited to this. As the filler, zirconia and other ceramic materials are selected. In addition to this, a black pigment or the like is mixed with the constituent materials.

Next, a process of manufacturing the barrier rib 33 as shown in FIG. 1C will be described. First, as shown in FIG. 1A, the display electrodes 32 are printed on the plasma substrate glass 31 by screen printing or the like to have a thickness of 50 μm, for example. Next, the lower insulating layer 33b is multilayer-printed on the printed display electrode 32 by, for example, a screen printing method. In this case, as the printing ink, for example, lead glass, a zirconia-based filler, an organic substance, a black pigment or the like mixed with an organic solvent is used. The height of the lower insulating layer 33b is, for example, about 160 to 190 μm.

Next, an upper insulating layer 33a 'is further printed and laminated by, for example, a screen printing method on the lower insulating layer. In this case, the printing ink is, for example, lead glass, a ceramic filler having a particle size of 1 μm or less, an organic substance, a black pigment or the like mixed with an organic solvent, or the ceramic filler is excluded from these. The one composed of components is used. Further, the thickness of the upper insulating layer 33a ′ is set to about 30 to 70 μm in consideration of the cutting allowance.

After the printing of the barrier ribs 33 'is completed in this way, the display electrodes 32 and the barrier ribs 33' are fired at, for example, about 570 ° C. Then, the tip surface of the upper insulating layer 33a 'of the barrier rib is polished to complete the partition wall 5 as shown in FIG. 1 (C). According to such a configuration of the barrier rib 33, the lower insulating layer 33 that is in close contact with the display electrode 32 is provided.
b is printed with a printing ink having good adhesion to the display electrode 32, and is used for printing a portion that occupies most of the height of the barrier ribs with an ink having good printability, so that b is excellent in productivity. Further, since the upper insulating layer 33a does not contain a filler or uses a filler having a small particle diameter, the polishing surface is dense and has a good polishing effect when polished, There are few irregularities. As a result, the unevenness of the dielectric sheet 4 is less likely to occur, and the unevenness of the gap of the liquid crystal portion 23 is, for example, 0.1 μm or less, and uneven display of the liquid crystal is less likely to occur. Further, since the glass as the main component of the upper side and the lower side are both lead glass, the adhesion between the upper and lower insulating layers is also excellent.

After that, as shown in FIG. 3C, the dielectric sheet 4 and the plasma substrate glass 31 are bonded together via the frit seal 35. Next, the inside of the sealed chamber 36 surrounded by the frit seal 35 is evacuated by a vacuum pump (not shown). After further gas injection, mercury vapor is diffused into the sealed chamber.

After that, an alignment treatment (not shown) is performed, and the alignment shown in FIG.
As shown in FIG. 3D, spacers 24 for making the liquid crystal layer have a uniform thickness are dispersed, and as shown in FIG. The plasma addressed display device shown in FIG. 2 can be obtained by joining the sheet 4 to form a liquid crystal chamber and then injecting liquid crystal.

The present invention is not limited to the above embodiment. For example, although the barrier rib has a two-layer structure in the above example, it may have a three-layer structure or more. In this case, for example, the intermediate layer can have a function as an adhesive between the upper layer and the lowermost layer. In addition, the material of the barrier ribs is not limited to the above example, and various changes can be made without departing from the scope of the present invention.

[0029]

According to the plasma addressed display device of the present invention,
It is possible to prevent the liquid crystal display unevenness by reducing the liquid crystal gap unevenness as much as possible.

[Brief description of drawings]

FIG. 1 shows an insulating rib according to a plasma addressed display device of the present invention, in which (A) and (B) are manufacturing steps,
(C) is each sectional drawing which shows an insulating rib.

FIG. 2 is a cross-sectional view showing an example of a plasma addressed display device.

3A to 3E are flowcharts showing a manufacturing process of the plasma addressed display device of FIG.

FIG. 4 is an enlarged cross-sectional view of a tip portion of an insulating rib in a conventional plasma addressed display device.

FIG. 5 is a cross-sectional view illustrating that unevenness in the height of insulating ribs causes unevenness in the gap of the liquid crystal layer.

[Explanation of symbols]

 2 Liquid Crystal Cell 3 Plasma Cell 4 Dielectric Sheet 5 Partition 21 Color Filter Substrate 22 Liquid Crystal Sealing Material 23 Liquid Crystal Layer 31 Plasma Substrate Glass 32 Display Electrode 33 Barrier Rib 33a Upper Barrier Rib 33a 'Before Polishing Upper Barrier Rib 33b Lower Barrier Rib 34 Plasma Chamber 35 Frit seal

Claims (5)

[Claims] 1. A liquid crystal cell and a plasma cell are laminated via a dielectric sheet, and a plasma substrate glass constituting the plasma cell and a large number of the dielectric sheet are opposed to each other via a partition wall provided in parallel. In the plasma addressed display device, the insulating ribs forming the partition wall have a laminated structure composed of two or more insulating layers between the base end and the tip, and each insulating layer is made of a different material. Plasma addressed display device characterized by. 2. The plasma according to claim 1, wherein the constituent material of the tip side insulating layer which constitutes the partition wall and is in contact with the dielectric sheet is denser than the constituent material of the base end side insulating layer. Address display device. 3. The constituent material of the tip-side insulating layer that constitutes the partition wall is composed mainly of glass that does not contain a filler, and the constituent material of the base-end-side insulating layer contains a filler. The plasma address display device according to claim 2, which is mainly composed of glass. 4. The constitution of the base-side insulating layer, wherein the constituent material of the tip-side insulating layer constituting the partition wall is mainly composed of glass and contains a filler having a particle diameter of 0.1 μm or less. 3. The method of manufacturing a plasma addressed display device according to claim 2, wherein the material is glass as a main component and contains a filler having a particle diameter larger than 0.1 μm. 5. The plasma address display device according to claim 1, wherein the insulating ribs forming the partition walls are laminated by multilayer printing.