JPH11212098A - Electrode plate for liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode plate for a liquid crystal display device which is free from an alignment defect of liquid crystal molecules and has superior display quality as an electrode plate using ferroelectric or antiferroelectric liquid crystal. SOLUTION: On a transparent substrate 2, a light shield part layer 3, a color filter layer 4, and a transparent layer 5, an electrode layer 6 and an alignment layer 7 above the color filter layer 4, and a partition part layer 9 above the light shield part layer are stacked in order, and the direction of the partition wall part layer and the axial direction 8 of uniaixial alignment are almost parallel to each other. Consequently, fine irregularities of the surface of the color filter layer 4 constituting the electrode plate for the liquid crystal display device causes neither twisting or unevenness of the alignment of liquid crystal molecules to remove a hotbed where an alignment defect of liquid crystal molecules is caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode plate used for a liquid crystal display device, and more particularly to an electrode plate for a liquid crystal display device which is suitable for using a ferroelectric liquid crystal or an antiferroelectric liquid crystal.

[0002]

2. Description of the Related Art Since ferroelectric liquid crystals and antiferroelectric liquid crystals have a so-called memory effect, large-capacity display can be performed by simple matrix driving without using active elements such as TFTs. Is expected. However, in order to put a liquid crystal display device using a ferroelectric liquid crystal or an antiferroelectric liquid crystal into practical use, it is necessary to simultaneously overcome two problems.
One is that a liquid crystal display device capable of forming a layer composed of a large-area defect-free chiral smectic phase, especially an alignment control technique, must be established and alignment defects of liquid crystal molecules in the liquid crystal display device must be completely removed. That is. Another is that the display device must be a liquid crystal display device that realizes a large-area, defect-free color display and has excellent earthquake resistance and shock resistance.

When an alignment defect of liquid crystal molecules is present in such a liquid crystal display device, when the refractive index for linearly polarized light differs on both sides of the alignment defect, a slight difference in shading occurs. There are problems such as that the defect itself constantly shines and that it becomes a hotbed for the generation of a new defect, and so it is difficult to put it to practical use.

[0004] As a related technique for overcoming the above-mentioned problems at the same time, for example, Japanese Patent Application Laid-Open No. 8-160435 discloses "a liquid crystal panel structure excellent in earthquake resistance and impact resistance is provided. For the purpose of completely removing the molecular alignment defect and the tree-like alignment defect and realizing color display, `` at least one pair of transparent substrates,
A color filter and a light-shielding layer, a pair of electrodes formed on the substrate and facing each other, and a plurality of partition members provided between the two substrates and arranged in parallel with each other at a predetermined interval. ing. A liquid crystal panel frame, a liquid crystal panel body, and a liquid crystal display having a structure in which a partition member forms a plurality of linear spaces separated from each other and arranged in parallel between the two substrates, and a liquid crystal is sealed in the linear spaces. Is presented.

FIG. 2 is a partial perspective cross-sectional view of an example of an electrode plate for a liquid crystal display device in a conventional method. The above-mentioned problems can be overcome at the same time, that is, a liquid crystal having excellent vibration resistance and shock resistance. It has a configuration that does not generate alignment defects of molecules. That is, in FIG. 2, the electrode plate (11) for a liquid crystal display device has a stripe-shaped partition wall layer (19) formed on a transparent substrate (12), and a stripe-shaped collar layer between the stripe-shaped partition wall layers (19). Filter layer (1
4), a stripe-shaped electrode layer (16) and a stripe-shaped alignment film layer (17) are sequentially provided. 1
Numeral 8 indicates the direction of orientation.

However, the striped color filter layer (14) in FIG. 2 is formed by a printing method, a dyeing method, an electrodeposition method, a pigment dispersion method, or the like, and is formed by, for example, a pigment dispersion method. The color filter layer has fine irregularities on the surface of the color filter layer. The fine irregularities serve as a hotbed that causes twisting and irregularity in the orientation of the liquid crystal molecules and induces alignment defects in the liquid crystal molecules.

The fine irregularities on the surface of the color filter layer are caused by forming a stripe-shaped electrode layer (1) on the color filter layer.
6) and a stripe-shaped alignment film layer (17) are provided. Since the thickness of each layer is about 1000 °, fine irregularities on the surface of the color filter layer are flattened, It is not enough to suppress the influence of irregularities.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an electrode plate for a liquid crystal display device using a ferroelectric liquid crystal or an antiferroelectric liquid crystal, wherein a surface of a color filter layer constituting the electrode plate for a liquid crystal display device is formed. Fine irregularities prevent twisting and irregularity in the alignment of liquid crystal molecules, prevent a hotbed that induces alignment defects in liquid crystal molecules, and have excellent display quality without alignment defects in liquid crystal molecules, ferroelectric liquid crystal or An object of the present invention is to provide an electrode plate for a liquid crystal display device suitable for a liquid crystal display device using an antiferroelectric liquid crystal.

[0009]

According to the present invention, at least one side of a transparent substrate has at least (a) a stripe-shaped light-shielding portion layer formed at a predetermined pitch, and (b) both end portions in the width direction of the stripe-shaped light-shielding portion layer. A stripe color filter layer formed between the stripe-shaped light-shielding portion layers with both ends in the width direction overlapping each other, (c) an electrically insulating transparent layer, and (d) located above the stripe color filter layer. A stripe-shaped electrode layer formed corresponding to the stripe-shaped color filter layer, (e) an alignment film layer subjected to a uniaxial alignment treatment,
(F) A stripe-shaped partition wall layer formed corresponding to the stripe-shaped light-shielding portion layer is sequentially laminated at a position located above the center portion in the width direction of the stripe-shaped light-shielding portion layer. An electrode plate for a liquid crystal display device, wherein a stripe direction of a partition wall layer and an axial direction of a uniaxial orientation provided on the alignment film layer are substantially parallel.

Further, the present invention provides the electrode plate for a liquid crystal display device according to the above invention, wherein the thickness of the transparent layer is about 1.5 to 3.0 times the thickness of the stripe color filter layer. It is a characteristic electrode plate for a liquid crystal display device.

Further, the present invention provides the electrode plate for a liquid crystal display device according to the above invention, wherein the width of the stripe-shaped partition layer is smaller than the width of the stripe-shaped light shielding portion layer. It is.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electrode plate for a liquid crystal display device according to the present invention will be described in detail based on its embodiments.
FIG. 1 is a partial perspective sectional view showing one embodiment of an electrode plate for a liquid crystal display device according to the present invention. As shown in FIG. 1, an electrode plate (1) for a liquid crystal display device has a stripe-shaped light-shielding portion layer (3) formed at a predetermined pitch (P) on one surface of a transparent substrate (2), and then a stripe-like shape. A stripe-shaped color filter layer (4) formed between the stripe-shaped light-shielding portions in a state where both ends in the width direction overlap on both ends in the width direction of the light-shielding portion layer (3), and then an electrically insulating transparent layer (5). Next, a stripe-shaped electrode layer (6) formed corresponding to the stripe-shaped color filter layer is formed at a position located above the stripe-shaped color filter layer, and an alignment film layer (7) that has been subjected to a uniaxial alignment treatment. ), A stripe-shaped partition wall layer (9) formed corresponding to the stripe-shaped light-shielding portion layer is sequentially laminated at a position located above the center portion in the width direction of the stripe-shaped light-shielding portion layer. . As shown in FIG. 1, the stripe direction of the stripe-shaped partition wall layer (9) is substantially parallel to the uniaxially oriented axial direction (8) provided on the alignment film layer.

In FIG. 1, W ₁ is the width of the striped partition layer (9), and W ₂ is the striped color filter layer (4) in the width direction of the striped light-shielding layer (3).
The width of the portion does not overlap, W ₃ are those showing the width of the stripe-shaped light shielding portion layer (3).

As described above, the electrode plate (1) for the liquid crystal display device according to the present invention is provided with the stripe-shaped partition layer (9). The height of the partition wall layer (9) is the gap cell gap generated between the counter electrode plates (not shown). Also, by bonding the upper surface of the stripe-shaped partition wall layer (9) to the surface of the counter electrode plate, the liquid crystal display device becomes a liquid crystal display device having excellent shock resistance and shock resistance.

As described above, the electrically insulating transparent layer (5) is provided on the electrode plate (1) for a liquid crystal display device according to the present invention.
Is provided, for example, flattening fine irregularities on the surface of the color filter layer formed by the pigment dispersion method, suppressing the effects of the fine irregularities on the surface, and causing twisting and irregularity in the alignment of liquid crystal molecules. A liquid crystal suitable for a liquid crystal display device using a ferroelectric liquid crystal or an antiferroelectric liquid crystal, which prevents a hotbed that induces alignment defects of liquid crystal molecules and has excellent display quality without alignment defects of liquid crystal molecules. It becomes an electrode plate for a display device.

The transparent substrate (2) used in the present invention includes:
The glass is not particularly limited as long as it is a transparent glass that is usually used as a color filter substrate. However, the composition of the glass is low alkali, which is low in alkali metal ions that cause deterioration of display characteristics of a liquid crystal display device. Alkali glass or soda glass coated with a SiO ₂ layer to prevent elution of alkali metal ions is preferable.

As the transparent substrate (2), soda glass, about 370 × 470 mm in size and about 1.1 mm in thickness was used. SiO ₂ is immersed in this soda glass to a thickness of about 800Å by a dipping method.
Applied.

Next, by sputtering, a metal chromium film is formed on the entire surface to a thickness of about 0.2 μm, and furthermore, a photosensitive resin is coated on the upper surface thereof, and is partially exposed to light and developed, and a known photoetching for dissolving the exposed metal chromium is performed. According to the method, the line width is about 30 μm, the pitch is about 300 μm, and the optical density (log ₁₀
I ₀ / I _I , where I ₀ is the amount of incident light and I _I is the amount of transmitted light.
3.0 or more stripe-shaped light-shielding portion layers (3) were formed.

The material of the stripe-shaped color filter layer (4) to be formed next is a pigment-dispersion type colored photosensitive resin composition used in display devices and the like, manufactured by FUJIFILM Ohrin Co., Ltd. Name color mosaic, product number CR-2000 (red), CG-2000 (green), CB-
Using 2000 (blue), a striped color filter layer (4) was formed. In FIG. 1, 4R, 4G, and 4B indicate red, green, and blue striped color filter layers, respectively.

The width of the striped color filter layer (4) was about 290 μm, the overlapped portion with the striped light shielding layer (3) was about 10 μm on one side, and the layer thickness was about 1.0 μm. The width (W ₂ ) of the portion where the stripe color filter layer (4) did not overlap in the width direction of the stripe light shielding portion layer (3) was about 10 μm.

Subsequently, as an electrically insulating transparent layer (5), using a product name [HF] manufactured by Okuno Pharmaceutical Co., Ltd., it is applied by a spinner to obtain a layer having a thickness of about 2.0 μm after drying. Was. The thickness of the electrically insulating transparent layer (5) is about 1.5 times the thickness of the striped color filter layer (4).
When the thickness is less than twice, the fine irregularities on the surface of the color filter layer are flattened, which is insufficient to suppress the influence of the fine irregularities. When it is about 3.0 times or more, new undulation-like irregularities tend to be formed on the surface of the electrically insulating transparent layer (5). Is preferably about 1.5 times to about 3.0 times the thickness of the striped color filter layer (4).

Subsequently, an ITO film of about 1500 ° is formed by sputtering, and a striped electrode layer (6) having a line width of about 270 μm and a pitch of about 300 μm is formed by a conventional photolithography method so as to correspond to the color filter. did.

Next, a 2% solution of 1000% polyimide resin, HL1110, manufactured by Hitachi Chemical Co., Ltd. was applied on the transparent substrate on which the striped electrode layer (6) was formed.
m for 20 seconds, and dried in an oven at 180 ° C. for about 1 hour to form an alignment film having a thickness of about 1500 °. Further, on the substrate having the alignment film layer (7) formed thereon, a resist AZ1400 (manufactured by Shipley Co., Ltd.) having a viscosity of 24 c
The p solution was spin-coated at 1000 rpm for 20 seconds, and a pattern of a striped partition wall layer was formed by standard photolithography. After drying at about 140 ° C. for about 1 hour, a striped partition wall layer (9) was obtained. The obtained stripe-shaped partition wall layer (9) has a thickness of about 1.5 μm, a width (W ₁ ) of about 10 μm, and a pitch of about 300 μm.

Here, the width (W ₁ ) of the stripe-shaped partition layer is about 10 μm, which is smaller than the width (W ₃ ) of the stripe-shaped light-shielding layer, which is about 30 μm. ₁ <is the stripe-shaped partition wall layer on the relationship W ₃ (9), in order to be concealed entirely by the striped light-blocking portion layer (3), the display quality of the liquid crystal display device becomes excellent, W ₁ And W ₃ are preferably in a relationship of W ₁ <W ₃ .

The uniaxial alignment process performed on the alignment film layer (7) is a process performed to align liquid crystal molecules in a certain direction. For example, a rubbing process can be considered. The process was performed substantially parallel to the partition wall layer (9).

In the electrode plate (1) for a liquid crystal display device obtained as described above, the transparent layer (5) has a thickness of about 2.0 μm. Flattening, suppressing the effects of fine irregularities on the surface, preventing twisting and irregularity in the alignment of liquid crystal molecules, preventing a hotbed that induces alignment defects in liquid crystal molecules, and eliminating alignment defects in liquid crystal molecules An electrode plate for a liquid crystal display device excellent in display quality and suitable for a liquid crystal display device using a ferroelectric liquid crystal or an antiferroelectric liquid crystal.

[0027]

According to the present invention, the electrode plate for a liquid crystal display device has a stripe-shaped light-shielding portion layer formed on one surface of a transparent substrate at a predetermined pitch, and then on both ends in the width direction of the stripe-shaped light-shielding portion layer. The stripe color filter layer formed between the stripe light-shielding portions with the both ends in the width direction overlapping with each other, then the electrically insulating transparent layer, and then the stripe located on the stripe color filter layer The stripe-shaped electrode layer formed corresponding to the stripe-shaped color filter layer, the alignment film layer further subjected to the uniaxial orientation treatment, and the stripe-shaped light-shielding portion located above the center in the width direction of the stripe-shaped light-shielding portion layer The stripe-shaped partition portion layers formed corresponding to the layers are sequentially laminated, and the stripe direction of the stripe-shaped partition portion layer and the axial direction of the uniaxial orientation provided on the alignment film layer are substantially flat. Therefore, fine irregularities on the surface of the color filter layer that constitutes the electrode plate for liquid crystal display devices do not cause twisting or irregularity in the orientation of the liquid crystal molecules, and induce alignment defects in the liquid crystal molecules. And an electrode plate for a liquid crystal display device using a ferroelectric liquid crystal or an antiferroelectric liquid crystal, which is excellent in display quality without alignment defects of liquid crystal molecules and is suitable for a liquid crystal display device.

In the present invention, the thickness of the electrically insulating transparent layer is about 1.5 to about 3.0 times the layer thickness of the striped color filter layer. For liquid crystal display device for ferroelectric liquid crystal or antiferroelectric liquid crystal with excellent display quality without fine defects on the surface of the color filter layer constituting the electrode plate and without alignment defects of liquid crystal molecules It becomes an electrode plate. In the present invention, since the width of the stripe-shaped partition wall layer is smaller than the width of the stripe-shaped light-blocking layer, the stripe-shaped partition wall layer is completely hidden by the stripe-shaped light-blocking layer. In addition, the display quality of the liquid crystal display device becomes excellent.

[Brief description of the drawings]

FIG. 1 is a partial perspective sectional view showing one embodiment of an electrode plate for a liquid crystal display device according to the present invention.

FIG. 2 is a partial perspective sectional view of an example of an electrode plate for a liquid crystal display device according to a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrode plate for liquid crystal display devices 2 ... Transparent substrate 3 ... Striped light shielding part layer 4 ... Striped color filter layer 4R ... Red striped color filter layer 4G ... Green striped color filter layer 4B ... Blue striped color filter layer DESCRIPTION OF SYMBOLS 5 ... Electrical transparent layer 6 ... Striped electrode layer 7 ... Orientation film layer 8 ... Uniaxially oriented axial direction 9 ... Striped partition wall layer 11 ... Electrode plate for liquid crystal display device in conventional method 12 ... Transparent in conventional method substrate 14 ... striped partition wall layer W ₁ in the axial direction 19 ... conventional methods uniaxial orientation in the oriented film layer 18 ... conventional methods in the stripe-shaped electrode layer 17 ... conventional methods in striped color filter layer 16 ... conventional methods in the conventional method width direction of the stripe Karafi of ... stripe partition wall layer width W ₂ ... striped light shielding layer of the Width P ... pitch of the width W ₃ ... stripe-shaped light-shielding layer of the part that data layer is not me overlaps

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichiro Fukuda 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (3)

[Claims] 1. A stripe-shaped light-shielding portion layer formed at a predetermined pitch on at least one surface of a transparent substrate, and (b) both end portions in the width direction of the stripe-shaped light-shielding portion layer are formed on both end portions in the widthwise direction. A striped color filter layer formed between the striped light-shielding portions in an overlapping state; (c) an electrically insulating transparent layer; and (d) a striped color filter layer located above the striped color filter layer. (E) an alignment film layer that has been subjected to a uniaxial orientation treatment; and (f) a stripe-shaped electrode layer located above the center in the width direction of the stripe-shaped light-shielding portion layer. Stripe-shaped partition wall layers formed corresponding to the light-shielding portion layer are sequentially laminated, and the stripe direction of the stripe-shaped partition wall layer and the axial direction of the uniaxial orientation applied on the alignment film layer, Almost flat The liquid crystal display device electrode plate, characterized in that it. 2. The electrode plate for a liquid crystal display device according to claim 1, wherein the thickness of the transparent layer is approximately 1.5 to 3.0 times the thickness of the stripe color filter layer. 3. The electrode plate for a liquid crystal display device according to claim 1, wherein the width of the stripe-shaped partition wall portion layer is smaller than the width of the stripe-shaped light shielding portion layer.