JPH11337984A - Liquid crystal panel body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal panel body which is provided with color filters without forming any gap between a transparent substrate and the partition member with respect to a liquid crystal panel body constituted by providing a partition member. SOLUTION: The liquid crystal panel body has a couple of transparent substrates 2 and 3, at least one of which is transparent, a couple of electrodes 4 and 5 which are formed on those substrates 2 and 3 and face each other, linear partition members 6 which are provided between both the substrates 2 and 3 and arranged in parallel to one another at prescribed intervals, and an alignment layer which is formed on at least one of the couple of substrates 2 and 3 and uniaxially aligned and is provided with color filter layers 7 provided in stripes of three red, green, and blue colors on one of the couple of the substrates 2 and 3 and further provided with the said linear partition members 6 in stripes parallel to the color filter layers 7 between the color filter layers 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial OA (Of
The present invention relates to a liquid crystal panel used for liquid crystal displays for fice automation) or home use. In particular, the present invention relates to a liquid crystal panel suitable for using a ferroelectric liquid crystal or an antiferroelectric liquid crystal.

[0002]

2. Description of the Related Art Liquid crystal displays (Liquid Crystal Dis)
Play: LCD) is lightweight and thin, so it can be used for display of small calculators, display for measuring instruments such as testers, and for displaying figures and characters on planes for decoration, POP, etc. It is widely used as various display bodies such as display bodies. It is also used as a television that displays moving images in full color using thin film transistors (TFTs), and as a large-capacity thin terminal display for personal computers and workstations.

[0003] The above-mentioned various display devices mainly use the shutter property of the liquid crystal. A typical example of the liquid crystal exhibiting the shutter property is a twisted nematic (TN) using a nematic phase. Liquid crystal and super twisted nematic (STN) liquid crystal. There are also ferroelectric liquid crystals and antiferroelectric liquid crystals using a chiral smectic phase. Among these liquid crystals, in recent years, ferroelectric liquid crystals and antiferroelectric liquid crystals are particularly (1)
It has a memory effect (2) High-speed response is possible (about 1000 times that of nematic liquid crystal) (3) Large display capacity display is possible (1000 or more scanning lines) (4) Research from advantages such as wide viewing angle The liquid crystal panel body that uses it is also published. Also, due to these advantages, TFT
A large-capacity display can be performed simply by XY matrix driving without using an active element such as a thin film transistor.

[0004] For a liquid crystal panel utilizing the characteristics of ferroelectric liquid crystal, problems that must be particularly noted in producing the panel are described in, for example, the following literature. "Next-generation liquid crystal display and liquid crystal material" supervised by Fukuda: CMC Co., Ltd., 1992. One is to establish a method capable of mass-producing a large-area thin film composed of a defect-free chiral smectic phase, in particular, an orientation control technique. Another is to store a large area defect-free chiral smectic phase in a liquid crystal panel frame excellent in earthquake resistance and impact resistance. Regarding this, the invention has already been described in the following publication. JP-A-7-318912 "Liquid crystal panel frame, liquid crystal panel body and liquid crystal display". FIG. 2 shows the internal structure of the panel body. When the liquid crystal panel is viewed from above, it has a structure as shown in FIG. In FIG. 2, a linear partition member 18 having a thickness corresponding to the cell gap G is formed between the stripe-shaped transparent electrodes 15 formed on one glass substrate 13. The other glass substrate 12 is adhered to the partition member 18 by an appropriate means, whereby the pair of substrates is completely adhered, and the liquid crystal panel frame for enclosing the liquid crystal in which the cell gap G is accurately defined. Is configured.

Reference numerals 19 and 17 are polyimide alignment films. Reference numeral 14 denotes an opposing transparent electrode that faces one of the transparent electrodes 15 and extends in a stripe shape in a direction perpendicular to the transparent electrode 15. Reference numeral 16 denotes an insulating film.
As the insulating film, for example, 1000Å of alumina or silica is used.
A thin film of the order can be used. Further, the insulating films can be provided on both sides. With this configuration, each partition member 1
8, a linear space R is formed. A liquid crystal panel 11 is formed by enclosing a ferroelectric liquid crystal (FLC) or an antiferroelectric liquid crystal in these spaces R. The linear spaces R above the stripe-shaped electrodes 15 are separated from each other by the partition member 18. Except for the opening at the front end portion 22 and the opening at the rear end portion 23 in FIG.
It forms a complete closed space. That is, the portion other than the opening is sealed with respect to the liquid. The rear end portion 23 can be closed by bonding to the seal portion 21. The cross-sectional shape of the linear space R is a flat quadrilateral, that is, a rectangular shape.

The following items can be controlled by adopting such a structure of the panel body. That is, (1) the method of infiltrating the liquid crystal into the liquid crystal panel frame is defined;
(2) To define the direction of volume contraction of the liquid crystal due to cooling, (3) To control the growth direction of the chiral smectic phase layer, and the like. As a result, the above problem is solved by completely enclosing the ferroelectric liquid crystal or the antiferroelectric liquid crystal in the linear space of the panel frame, increasing the temperature of the whole, and gradually cooling from one end. That is, a thin film composed of a defect-free chiral smectic phase having a large screen, and housed in a liquid crystal panel frame excellent in earthquake resistance and impact resistance, can be formed into a liquid crystal panel body.

However, if a color filter layer is provided on such a liquid crystal panel, this problem may not be satisfied. FIG. 4 is a sectional view of a side surface in which a color filter layer is provided on such a liquid crystal panel body. FIG. 4A shows that a transparent electrode, a partition member 36 and the like are provided on a lower transparent substrate 33,
Color filter layer 37 and transparent electrode 3 on upper transparent substrate 32
4. A light shielding film 38 and an overcoat layer 39 are provided. FIG. 4B shows a panel body 31 in which the upper and lower transparent substrates 32 and 33 are bonded by applying heat and pressure by appropriate means. As will be understood from this, when the liquid crystal panel body is formed so that the direction in which the partition member 36 is erected is perpendicular to the direction of the color filter layer 37, the bonding with the partition member 36 is performed in a portion where the color filter layer 37 exists and a portion where the color filter layer 37 does not exist. The unevenness is also reflected on the surface. As a result, when bonding is performed by applying heat and pressure to the opposing substrate, the bonding may be incomplete.
The thickness of the color filter layer is about 1 μm,
The same applies when an overcoat layer of about μm is added.
Accordingly, a gap 40 is formed between the partition member 36 and the overcoat layer 39 which are the bonding portions. The sealing of the linear space by the partition member 36 is lost, and the control by the panel frame as described above cannot be performed, and the liquid crystal moves between the adjacent linear spaces. As a result, the above-mentioned problem is not satisfied, a defect may occur, and display unevenness may occur.

[0008]

An object of the present invention is to provide a liquid crystal panel body in which liquid crystal is sealed in a linear space formed by providing a partition member, wherein a gap is provided between the transparent substrate and the partition member. An object of the present invention is to provide a liquid crystal panel body provided with a color filter layer without causing any problem.

[0009]

According to a first aspect of the present invention, there is provided a pair of substrates, at least one of which is transparent, a pair of electrodes formed on those substrates and opposed to each other, and A plurality of linear partition members provided and arranged in parallel with each other at a predetermined interval, a linear space sealed by both substrates and the linear partition member, and And an alignment film that is formed on at least one of the substrates and is subjected to a uniaxial alignment treatment, and a red, green, and blue three-color stripe is formed on one of the pair of substrates. Color filter layers provided in a shape, and, at a portion between these color filter layers,
A liquid crystal panel, wherein the linear partition members are provided in stripes parallel to these color filter layers, and a ferroelectric liquid crystal or an antiferroelectric liquid crystal is sealed in the linear space. Body.

According to a second aspect of the present invention, in the liquid crystal panel according to the first aspect, the thickness of the color filter layer is 0.7.
A liquid crystal panel body characterized in that the thickness of the linear partition member is 0.8 to 1.2 times the thickness of the color filter layer.

[0011]

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory sectional view schematically showing a liquid crystal panel body of the present invention. In FIG.
Reference numeral 1 denotes a liquid crystal panel of the present invention. The liquid crystal panel body 1 includes a pair of substrates 2 and 3 facing each other, and a pair of electrodes 4 formed on the substrates 2 and 3 and facing each other.
5, a plurality of linear partition members 6 provided between the two substrates and arranged in parallel with each other at a predetermined interval, and three stripes of red, green, and blue on the substrate 3. And a color filter layer 7 for selecting transmitted light in a corresponding color, and stripes parallel to the color filter layers 7 at portions between the color filter layers 7 so that unnecessary light A light shielding film 8 for preventing transmission,
An overcoat layer 9 provided to cover the entire surface including the light-shielding film 8 and the color filter layer 7; a linear partition member 6 provided in a stripe at the same position as the light-shielding film 8; And a non-aligned film. The panel of the present invention is used as a liquid crystal display by filling a linear space R defined by the substrates 2 and 3 and the partition member 6 with a liquid crystal. The alignment film is oriented so that the liquid crystal filled and sealed in the linear space R is oriented.
It is provided on the inner surface side.

The substrates 2 and 3 serve as structural supports for the entire liquid crystal panel 1, and preferably have a physical strength that is not easily broken. The substrates 2, 3
Among them, the substrate located on the display screen side is desirably transparent. For example, a glass plate can be suitably used as such a transparent substrate. Next, the electrodes 4 and 5 drive the liquid crystal display by applying a voltage to the liquid crystal filled in the linear space R, and at least one of the electrodes 4 and 5 located at the display screen side is used for driving the liquid crystal display. Desirably, it is transparent. As such a transparent electrode, for example, a thin film of ITO (indium tin oxide) can be used.

Further, the color filter layer 7 selectively transmits light to enable display of a color screen. For this reason, the color filter layer 7 is provided with three primary colors of red, green and blue light. Such a color filter layer 7 can be made of a transparent resin containing a colorant of a corresponding color. Dyes or pigments can be used as the colorant.
As the transparent resin, those which are cured by ultraviolet light or heat can be preferably used. As such a resin, an acrylic resin or a polyimide resin is preferable. Note that the thickness of the color filter layer 7 is preferably from 0.7 to 1.6 μm. If the thickness is less than 0.7 μm, the coloring is generally insufficient and a good color screen cannot be displayed. On the other hand, if it is thicker than 1.6 μm,
The electrode 4 may be disconnected. More preferably 1.2μ
m to 1.4 μm.

The light-shielding film 8 prevents light from transmitting from a portion between the color filter layers 7 to enable a high-contrast screen display. Such a light-shielding film 8 is preferably thinner, and is, for example, a chromium thin film or a chromium oxide thin film formed by a thin film forming method such as a sputter deposition method. Since the room light reflected by the light-shielding film 8 may cause deterioration of display quality, a thin film of chromium nitride is stacked on a thin film of chromium or a thin film of chromium oxide to reduce the reflectance. It is also possible. It is important that the linear partition members 6 are provided in the same region as the light-shielding film 8, that is, in the region between the color filter layers 7 in a stripe shape parallel to the color filter layers 7. . If provided in a direction intersecting with the color filter layer 7, a step caused by the color filter layer 7 appears on the surface of the partition member 6, which makes it difficult to seal the liquid crystal in the linear space R. A defect will occur in the display device.

For such reasons, it is desirable that the thickness of the partition member 6 is at least 0.8 times the thickness of the color filter layer 7. When the thickness of the partition member 6 is 0.8 times or more the thickness of the color filter layer 7, even if there is unevenness due to the color filter layer in a portion between the color filter layers, the partition member 6 does not. Absorbs the irregularities, making it possible to flatten the surface to some extent. The thickness of the partition member 6 is preferably 2.0 μm or less. The thickness of the partition member 6 is a linear space R that seals the liquid crystal.
Is determined, that is, the thickness of the liquid crystal layer,
If it exceeds 2.0 μm, the storage effect peculiar to the ferroelectric liquid crystal or the antiferroelectric liquid crystal is hardly exhibited.

However, the partition member 6 provided between the color filter layers has a lower adhesiveness to the opposing substrate when the upper surface serving as a bonding surface with the opposing substrate is made flat by alleviating the unevenness of the surface provided. Desirable in point. For that purpose, the partition member 6 also needs to have a certain thickness. The thickness can be defined with respect to the thickness of the color filter layer 7. The thickness of the partition member 6 is determined by the color filter layer 7.
Is required at least 0.8 times the thickness of Further, since the thickness of the color filter is in a range of about 0.7 to 1.6 μm, the upper limit of the partition member 6 is 1.2 times the thickness of the color filter layer 7. Thus, a memory effect can be exhibited in the sealed liquid crystal, and the liquid crystal can respond quickly to the applied voltage. Therefore, the liquid crystal panel of the present invention can make the most of its advantages when a ferroelectric liquid crystal or an antiferroelectric liquid crystal is applied as the liquid crystal. Particularly preferred are antiferroelectric liquid crystals.

[0017]

FIG. 1 shows a B4 size 1.1 m thick.
A pair of transparent substrates 2 and 3 are prepared by optically polishing a glass substrate having a thickness of 2 m and processing the flatness of the surface to within 2 μm. Chromium oxide and chromium metal were sequentially deposited on the transparent substrate 3 to form a two-layer film. Patterning was performed in the form of stripes between the color filter layers 7 to be formed later by ordinary photolithography to form a light shielding film 8. Next, on the transparent substrate 3,
Acrylic photosensitive resin CR-2000 (red), CB-2000 (blue), CG-
Spin coat each of 2000 (green) uniformly,
Exposure was performed by conventional photolithography, and development was performed with an alkaline solution, thereby sequentially forming a color filter layer 7 in a stripe shape. The thickness was good at 0.7 to 1.6 µm, but particularly good at 1.2 to 1.4 µm. On this, a transparent acrylic epoxy resin was formed on the entire surface, and silicon oxide was further formed on the entire surface to form an overcoat layer 9.
The thickness was 1.5 μm. Next, an ITO film of 1500 ° is formed on the overcoated transparent substrate 3 and the transparent substrate 2 by sputtering, and striped ITO electrodes 4 and 5 having a line width of 270 μm and a pitch of 300 μm are formed by a conventional photolithography. did.

Next, 2% of a polyimide resin (HL1110; manufactured by Hitachi Chemical Co., Ltd.) is placed on the transparent electrode substrates 2 and 3.
After spin coating the solution at 1000 rpm for 20 seconds,
After drying in an oven at 180 ° C. for about 1 hour, an alignment film was formed. Further, a 24 cp solution of resist AZ1400 (manufactured by Shipley Co., Ltd.) was spin-coated on the substrate 3 at 1000 rpm for 20 seconds. Thereafter, the adhesive partition member 6 was formed evenly in parallel with the stripes of each color filter 7 by ordinary photolithography. Then, it dried at 140 degreeC for 1 hour. The thickness of the partition member 6 was 0.8 to 1.2 times the thickness of the color filter, which was a good result. The width was 30 μm and the length was 20 cm. Partition member 6
Are 900. Then, both substrates were rubbed at room temperature. The rubbing direction was such that when both substrates were panel bodies, both substrates were parallel to the partition member and in the same direction. Next, the two substrates were bonded to form a panel frame, in which a ferroelectric liquid crystal CS1014 (manufactured by Chisso) or an antiferroelectric liquid crystal CS4000 (manufactured by Chisso) was sealed.
Thereafter, the temperature in the water tank was controlled by a known method, and the temperature was gradually raised and cooled to obtain a defect-free panel body.

[0019]

The liquid crystal panel of the present invention is a color filter layer provided on a transparent substrate in the form of stripes of three colors of red, green, and blue. Since the partition member is provided in a stripe shape in parallel with the color filter layer, the partition member can be provided without being affected by the step of the color filter layer. Therefore, the partition member and the transparent electrode substrate can be bonded without any gap. In the liquid crystal panel body of the present invention, since the liquid crystal is securely sealed in a narrow linear space, a liquid crystal in a uniform alignment state is obtained, and the liquid crystal display screen has no defect, high contrast, and good appearance. It will be.

[0020]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a liquid crystal panel according to the present invention.

FIG. 2 is a perspective sectional view showing the internal structure of a conventional liquid crystal panel body.

FIG. 3 is a plan sectional view of a conventional liquid crystal panel body.

FIG. 4 is a side sectional view showing a structure in which a color filter layer is provided inside a conventional liquid crystal panel body. (A) is a side sectional view before the upper and lower substrates of the conventional liquid crystal panel body are bonded. (B) is a side cross-sectional view after the upper and lower substrates of the conventional liquid crystal panel body are bonded.

[Explanation of symbols]

 1 ··· Liquid crystal panel body 2 ··· Counter substrate 3 ··· Substrate 4 ··· Pixel electrode 5 ··· Counter electrode 6 ··· Partition member 7 ··· Color filter layer 8 light-shielding film 9 overcoat layer 11 liquid crystal panel body 12 transparent glass substrate 13 transparent glass substrate 14 transparent ITO electrode 15 transparent ITO electrode DESCRIPTION OF SYMBOLS 16 ... Insulating film 17 ... Polyimide alignment film 18 ... Partition member 19 ... Polyimide alignment film 20 ... Liquid crystal sealing port 21 ... Seal part 22 ... Tip part of linear space 23 ····································································································· ... light shielding film 39 ... overcoat 4 ... gap R ···· linear space

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 9/35 302 G09F 9/35 302

Claims (2)

[Claims] 1. A pair of substrates at least one of which is transparent, a pair of electrodes formed on those substrates and facing each other, and provided between the two substrates and parallel to each other at a predetermined interval. A plurality of linear partition members arranged in a line; a linear space sealed by both substrates and the linear partition member; and a uniaxial orientation formed on at least one of the pair of substrates. And an alignment film to be subjected to processing, and a color filter layer provided in a stripe of three colors of red, green, and blue is provided on one of the pair of substrates, and The linear partition member is provided in a stripe parallel to the color filter layers at a portion between the color filter layers, and a ferroelectric liquid crystal or an antiferroelectric liquid crystal is provided in the linear space. Enclose Liquid crystal panel body, wherein the door. 2. The liquid crystal panel according to claim 1, wherein the thickness of the color filter layer is 0.7 to 1.6 μm, and the thickness of the linear partition member is less than the thickness of the color filter layer. A liquid crystal panel having a magnification of 0.8 to 1.2 times.