JPH10133192A - Display device - Google Patents

Abstract

(57) [PROBLEMS] To improve the yield by reducing defects at the time of manufacturing a liquid crystal display device using plasma as a switching element. A color filter substrate having a transparent electrode film and a color filter layer formed on a glass substrate;
And a liquid crystal layer 35 disposed in a gap between the color filter substrate and the glass substrate, the glass substrate 31 disposed opposite to the color filter substrate 43, Is formed by bonding an electrode substrate having a transparent electrode film formed thereon to a filter sheet having a color filter layer formed on a sheet. Alternatively, the color filter substrate has a structure in which the transparent electrode film 33 is formed on the liquid crystal layer side of the glass substrate 32 and the color filter layer 34 is formed on the other surface of the glass substrate 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a liquid crystal, and more particularly, to a plasma addressed liquid crystal for driving a liquid crystal using a plasma.

2. Description of the Related Art In recent years, a plasma addressed liquid crystal (PAL) has been developed.
A display device for driving a liquid crystal panel using a plasma panel called C: plasma addressed liquid crystal has been developed. FIG. 4 is a perspective view including the cross-sectional structure of the plasma addressed liquid crystal. This display device has a backlight 10, a plasma panel 20, and a liquid crystal cell 30. The plasma panel 20 includes the plasma substrate glass 2
1 and a dielectric sheet 31 made of a glass plate having a thickness of about 50 μm are disposed to face each other.
A striped plasma cell 23 is defined between the strips 1 and 31 by a striped rib partition wall 22 made of insulating ceramic. On the inner surface of the plasma substrate glass 21 in the plasma cell 23, two display electrodes, an anode 24 and a cathode 25, are arranged in parallel.
In the liquid crystal cell 30, the dielectric sheet 31 and the color filter substrate 40 are arranged to face each other via a spacer (not shown). The color filter substrate 40 is provided on the surface of the glass substrate 32 on the side of the dielectric sheet 31 from the substrate 32 side.
A transparent electrode film 33 of a stripe shape made of TO or the like and a color filter layer of a stripe shape having three colors of R, G, and B are sequentially laminated, and a liquid crystal is formed in a gap between the color filter layer and the dielectric sheet 31. 35 are filled. The color filter layer 34 and the transparent electrode film 33 are formed in a stripe shape, and are orthogonal to the plasma cell 23. A black mask 37 is formed between the color filter layers 34. A polarizing filter 38 is provided on the display surface of the glass substrate 32. On the other hand, a deflection filter 26 is provided on the surface of the plasma substrate glass 32 on the backlight side. The backlight 10 is arranged behind the plasma substrate glass 21. The above-mentioned plasma address display device comprises a transparent electrode film 33 and a plasma cell 23.
Are orthogonal to each other, the transparent electrode film 33 is a unit for column driving, the plasma cell 23 is a unit for row driving, and pixels are defined at the intersections of these. Such a method of driving a plasma addressed liquid crystal differs from a TFT color liquid crystal in that plasma is used for a switching element. That is, a voltage is applied between the anode 24 and the cathode 25 to cause discharge,
The plasma panel is turned on, and the inside of the plasma cell 23 is maintained at substantially the anode potential. When a data voltage for driving liquid crystal molecules is applied to the transparent electrode film 33 in this state, the data voltage is written via the dielectric sheet 21 to the liquid crystal of the pixels arranged in the column direction corresponding to the plasma cells 23. When the plasma discharge ends, the plasma cell 23 becomes a floating potential, and the voltage written to the liquid crystal of the corresponding pixel is held until the next writing period. Since the liquid crystal operates with the data voltage written from the transparent electrode film 33 to the liquid crystal layer of each pixel, display is performed in pixel units. Therefore,
A two-dimensional image can be displayed by sequentially scanning the plasma cells 23 in which data voltages are written to the liquid crystal layers of a plurality of pixels arranged in the column direction by generating plasma discharge in the row direction. Such a plasma addressed liquid crystal is shown in FIG.
As shown in (a), display electrodes 24 and 25 and rib partition walls 22 are previously formed on a plasma substrate glass 21 by, for example, a screen printing method, and then a dielectric sheet 31 is laminated and evacuated and gas-sealed. The plasma panel section 27 is assembled. On the other hand, a color filter substrate 4 in which a transparent electrode film 33 and a color filter layer 34 are laminated on a glass substrate 32
In this manner, spacers are sprayed on the surface of the color filter layer 34 of the color filter substrate 40, the plasma panel unit 27 and the color filter substrate 35 are bonded together, and a gap is filled with liquid crystal. A structure as shown in FIG. 5 (b) is obtained.

However, in the above-mentioned plasma addressed liquid crystal, the dielectric sheet 31 of the plasma panel section 27 is a thin glass plate having a thickness of about 50 .mu.m. 34 will face each other. Therefore, if a protrusion larger than the spacer is present in the color filter layer 34 during bonding, the dielectric sheet 31 is broken.
Since the color filter layer 34 is completed through many steps, projections may be formed due to fluctuations in the process or entrapment of dust during the process. Since the projections may cause the dielectric sheet to crack, the formed projections can be corrected by, for example, shaving off.However, as the area of the substrate increases, the influence of dust increases, and the fluctuation of the process increases. However, the number of corrections increases, and the productivity decreases. By using an overcoat that entirely covers the color filter layer 34, the height of the projections can be relatively reduced, but dust is involved in the application of the overcoat and new projections are created. Further, since the color filter layer 34 is on the liquid crystal surface, there is also a problem that components of the color resist may adversely affect the liquid crystal. Furthermore, since the color filter manufacturing process forms the color filter layer 34 on the transparent electrode film 33, the yield of the transparent electrode film affects the yield of the color filter, and the overall yield is deteriorated. The present invention has been made in view of the above circumstances, and has as its object to provide a display device that can solve such a problem.

In order to achieve the above object, the present invention provides, as a first invention, a color filter substrate in which a transparent electrode film and a color filter layer are formed on a glass substrate; In a display device including a glass substrate disposed to face and a liquid crystal layer present in a gap between the color filter substrate and the glass substrate, the color filter substrate is an electrode in which the transparent electrode film is formed on a glass substrate. A display device comprising a substrate and a filter sheet in which the color filter layer is formed on a sheet is provided. According to a second aspect of the present invention, there is provided a color filter substrate in which a transparent electrode film and a color filter layer are formed on a glass substrate, a glass substrate disposed to face the color filter substrate, In a display device having a liquid crystal layer present in a gap between a substrate and a glass substrate, the color filter substrate is such that the transparent electrode film is formed on a surface of the glass substrate on the liquid crystal layer side, and the color filter layer is formed of the glass substrate. A display device characterized by being formed on the other surface side is provided. The display device of the present invention uses a liquid crystal as a display element and combines two components of a conventional color filter substrate, a transparent electrode film and a color filter layer, into two.
Divided into two parts. That is, the display device of the first invention is to separately manufacture an electrode substrate in which a transparent electrode film is formed on a glass substrate and a filter sheet in which a color filter layer is formed on a sheet in advance, and then bond them to form a color filter. It constitutes a filter substrate. For this reason, even when the filter sheet is attached to the surface of the electrode substrate opposite to the surface on which the transparent electrode film is formed, and the transparent electrode film is brought into contact with the liquid crystal, or when the filter sheet is attached to the transparent electrode film, the color filter layer is formed. By attaching the filter sheet to the transparent electrode film side, it is possible to make the sheet of the filter sheet a surface in contact with the liquid crystal. Accordingly, the color filter layer does not come into contact with the liquid crystal, the influence of the projections of the color filter layer is eliminated, and a defect at the time of bonding with the dielectric sheet due to the color filter layer is eliminated. Since the color filter layer does not contact the liquid crystal surface as described above, the color resist of the color filter layer does not melt into the liquid crystal and does not adversely affect the liquid crystal. Further, since the transparent electrode film and the color filter layer are manufactured separately, these yields do not affect each other, and the consistent yield is improved. On the other hand, according to the second aspect of the invention in which the transparent electrode film and the color filter layer are formed on one surface of one glass substrate, the color filter layer can be arranged on the surface opposite to the surface in contact with the liquid crystal. The occurrence of defects due to layer protrusions is eliminated, and there is no inconvenience that the color resist dissolves in the liquid crystal. Such a problem associated with the formation of the color filter layer is common to display devices using liquid crystal as a display element. However, the projections of the color filter layer adversely affect the thin glass plate constituting the liquid crystal cell. Can be suitably applied to a plasma addressed liquid crystal using such a thin glass plate as a dielectric sheet.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described, but the present invention is not limited to the following embodiments. [First Embodiment] A first embodiment relates to the first invention, and in the plasma addressed liquid crystal described in the conventional example, the color filter substrate is a glass substrate on which a transparent electrode film is formed, and the sheet is a color filter. It is constituted by joining with a filter sheet on which a layer is formed. Figure 1 shows the first
FIG. 4 is a cross-sectional view illustrating the assembly of the display device according to the embodiment. The display device 1a has the same configuration except for the configuration of the plasma addressed liquid crystal and the liquid crystal cell unit shown in FIG. 4, and the same components are denoted by the same reference numerals. FIG. 1 (a)
As shown in FIG. 3, the color filter substrate 43a of the present embodiment
An electrode substrate 41 having a transparent electrode film 33 formed on one surface of a glass substrate 32 and a filter sheet 42 having a color filter layer 34 formed on one surface of a sheet substrate 39 formed of a glass plate or a resin sheet. Are separately manufactured, and these are attached to each other using, for example, an adhesive or the like, as shown in FIG. 1A, so that the color filter layer 34 side of the filter sheet 42 is attached to the transparent electrode film 33 side of the electrode substrate 41. FIG. 1 (b)
A color filter substrate 43a is manufactured as shown in FIG.
On the other hand, the plasma panel section 20 is manufactured in advance. Then, as shown in FIG. 1B, the color filter substrate 43 and the plasma panel unit 20 are bonded together via a spacer (not shown), and liquid crystal is injected into a gap between the dielectric sheet 31 and the sheet substrate 39. Most of the display device except for the backlight shown in (1) is completed. The electrode substrate 41 can be manufactured by forming a transparent electrode film 33 such as an ITO film or tin oxide on a glass substrate 32 by vapor deposition, sputtering, or the like, and patterning the film into a stripe shape using photolithography. Further, the filter sheet 42 is formed on a resin film 39 such as a light-transmitting glass plate or a polyester film by a printing method, a dyeing method, or the like by a color filter layer 34 composed of three colors of R, G, and B. Can be manufactured in the form of stripes. On the other hand, the plasma panel unit 20 includes display electrodes 24 and 25 on a plasma substrate glass 21.
And rib ribs 22 are formed by, for example, a screen printing method, and then a dielectric sheet is laminated, evacuated and gas-sealed, and then manufactured. In the above-mentioned plasma address display device, the transparent electrode film 33 and the plasma cell 23 are orthogonal to each other, the transparent electrode film 33 is a column drive unit, the plasma cell 23 is a row drive unit, and a pixel is defined at the intersection of these. is there. In driving such a plasma-addressed liquid crystal, a voltage is applied between the anode 24 and the cathode 25 to cause discharge, the plasma panel is turned on, and the inside of the plasma cell 23 is maintained at substantially the anode potential. When a data voltage for driving liquid crystal molecules is applied to the transparent electrode film 33 in this state, the data voltage is written via the dielectric sheet 21 to the liquid crystal of the pixels arranged in the column direction corresponding to the plasma cells 23. When the plasma discharge ends, the plasma cell 23
Becomes a floating potential, and the voltage written to the liquid crystal of the corresponding pixel is held until the next writing period. Since the liquid crystal operates with the data voltage written from the transparent electrode film 33 to the liquid crystal layer of each pixel, display is performed in pixel units. Therefore, a two-dimensional image can be displayed by sequentially scanning the plasma cells 23 in which data voltages are written to the liquid crystal layers of a plurality of pixels arranged in the column direction by generating a plasma discharge in the row direction. Such a display device 1a
The liquid crystal layer 35 is composed of the filter sheet 39 and the dielectric sheet 3
1 and the color filter layer 34 is a liquid crystal layer 35
Therefore, there is no possibility that the dielectric sheet 31 is cracked by protrusions generated in the manufacturing process of the color filter layer 34, and the yield is improved. In addition, there is no possibility that the components of the color filter layer 34 may dissolve into the liquid crystal layer 35 and adversely affect the liquid crystal layer 35. Therefore, an overcoat layer that covers the color filter layer 34 is unnecessary. Further, since it is not necessary to correct the projections of the color filter layer 34, the manufacturing process is also simplified. Further, since the manufacturing process of the color filter layer 34 and the manufacturing process of the transparent electrode film 33 are separate, the process time is shortened. Further, since one yield does not affect the other yield, the consistent yield is improved. . [Second Embodiment] The second embodiment relates to the first invention, and in the plasma addressed liquid crystal described in the conventional example, the color filter substrate comprises a glass substrate on which a transparent electrode film is formed; It is the same as the first embodiment in that it is configured by bonding with a filter sheet having a layer formed thereon, but the bonding mode is different. FIG.
It is a sectional view explaining the assembly of the display concerning a 2nd embodiment. This display device has the same configuration as the display device shown in FIG. 1, and the same components are denoted by the same reference numerals.
In this embodiment, an electrode substrate 41 having a transparent electrode film 33 formed on one surface of a glass substrate 32 and a color filter layer 34 formed on one surface of a sheet substrate 39 formed of a glass plate or a resin sheet are provided. A filter sheet 42 is manufactured, and these are joined to each other to form a color filter substrate 43b.
The transparent electrode film 3 of the electrode substrate 41 is manufactured.
The color filter layer 34 of the filter sheet 42 is joined to the opposite surface of the glass substrate on which the substrate 3 is formed, thereby manufacturing the color filter substrate 43b. Display device 1b of the present embodiment
Is configured such that the transparent electrode film 33 side of the color filter substrate 43b and the dielectric sheet 31 of the plasma panel unit 20 are arranged to face each other. Such a display device 1
In b, since the liquid crystal layer 35 is located in the gap between the transparent electrode film 33 and the dielectric sheet and the color filter layer 34 is not in contact with the liquid crystal, there is no possibility that the dielectric sheet 31 is broken by the projections of the color filter layer 34. , And the yield is improved. In addition, the components of the color filter layer 34 are
There is no danger of dissolving into the water. Therefore, an overcoat layer that covers the color filter layer 34 is unnecessary. Further, since it is not necessary to correct the projections of the color filter layer 34, the manufacturing process is also simplified. Further, since the process of manufacturing the color filter layer and the process of manufacturing the transparent electrode film are separate, the process time is shortened, and one yield does not affect the other yield, so that the consistent yield is improved. In addition, after forming an alignment film (not shown) on the transparent electrode film 33, the filter sheet 42 can be bonded to the electrode substrate 41. Therefore, conventionally, a high temperature is required for forming the polyimide used for the alignment film, and thus the material of the color filter layer 34 is required to have heat resistance, and there is a material limitation. In addition, the influence of heat at the time of forming the alignment film does not affect the color filter layer 34, so that the color resist does not need to have heat resistance, and the range of options is widened. Third Embodiment A third embodiment according to the second invention uses a color filter substrate in which a color filter layer is provided on one surface of a glass substrate and a transparent electrode film is formed on the other surface. FIG. 3 is a sectional view showing a display device according to the third embodiment. This display device 1c has the same configuration except for the configuration of the plasma addressed liquid crystal and the liquid crystal cell unit shown in FIG. 4, and the same components are denoted by the same reference numerals. In the color filter substrate 43c of the third embodiment, a transparent electrode film 33 is formed on one surface side of a glass substrate 32, and a color filter layer 34 is formed on the opposite surface of the glass substrate 32. The display device 1c according to the present invention includes the transparent electrode film 33 of the color filter substrate 43c and the plasma panel unit 20.
And the dielectric sheet 31 of FIG. In such a display device 1c, the liquid crystal layer 35 is located in the gap between the transparent electrode film 33 and the dielectric sheet 31 and the color filter layer 3
4 is not in contact with the liquid crystal layer 35. Therefore, there is no influence of the projections generated in the manufacturing process of the color filter layer, and there is no possibility that the dielectric sheet is broken by the projections of the color filter layer 34, and the yield is improved. In addition, there is no possibility that the components of the color filter layer 34 dissolve into the liquid crystal and adversely affect the liquid crystal. Therefore, an overcoat layer that covers the color filter layer 34 is unnecessary. Further, since it is not necessary to correct the projections of the color filter layer 34, the manufacturing process is also simplified. Further, since the manufacturing process of the color filter layer 34 and the manufacturing process of the transparent electrode film are separate, the process time is shortened, and one yield does not affect the other yield, so that the consistent yield is improved. In the above embodiment, the plasma panel is used for switching the liquid crystal. However, other liquid crystal driving means may be used, and various changes can be made without departing from the gist of the present invention.

According to the display device of the present invention, the yield during production can be reduced and the yield can be improved.

[Brief description of the drawings]

FIGS. 1A and 1B are sectional views showing a display device according to a first embodiment of the present invention, wherein FIG. 1A shows an assembly of a color filter substrate, and FIG. 1B shows an assembly of a color filter substrate and a plasma panel.

FIGS. 2A and 2B are cross-sectional views showing a display device according to a second embodiment of the present invention, wherein FIG. 2A shows an assembly of a color filter substrate, and FIG. 2B shows an assembly of a color filter substrate and a plasma panel.

FIG. 3 is a sectional view showing a display device according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a sectional structure of a plasma addressed liquid crystal.

5A and 5B are cross-sectional views of the plasma addressed liquid crystal shown in FIG. 4, wherein FIG. 5A shows an assembled part and FIG. 5B shows an assembled state.

[Explanation of symbols]

Reference Signs List 20: plasma glass substrate, 22: rib partition, 23: plasma chamber, 24: anode, 25: cathode, 31: dielectric sheet, 32: glass substrate, 33: transparent electrode film, 3
4: color filter layer, 34: liquid crystal layer, 39: sheet substrate, 41: electrode substrate, 42: filter sheet, 43: color filter substrate

Claims (5)

[Claims] A color filter substrate in which a transparent electrode film and a color filter layer are formed on a glass substrate; a glass substrate disposed so as to face the color filter substrate; In a display device having a liquid crystal layer present in a gap, the color filter substrate is formed by bonding an electrode substrate having a transparent electrode film formed on a glass substrate and a filter sheet having the color filter layer formed on a sheet. A display device characterized by being performed. 2. A color filter substrate in which a transparent electrode film and a color filter layer are formed on a glass substrate; a glass substrate disposed to face the color filter substrate; In a display device having a liquid crystal layer existing in a gap, the color filter substrate is formed such that the transparent electrode film is formed on a surface of the glass substrate on the liquid crystal layer side, and the color filter layer is formed on the other surface side of the glass substrate. A display device, comprising: 3. The display device according to claim 1, wherein the glass substrate facing the color filter substrate forms a plasma cell. 4. The display device according to claim 1, wherein the filter sheet on which the color filter layer is formed is made of resin. 5. The display device according to claim 2, wherein the glass substrate facing the color filter substrate forms a plasma cell.