JPH0436722A - Liquid crystal display device and its production - Google Patents

Abstract

PURPOSE:To obtain a clear display pattern by forming a light shielding film consisting of an electroless plating layer on a part of a translucent electrode formed on a translucent base and forming an organic orientation film on the translucent electrode and the light shielding film. CONSTITUTION:A translucent electrode 3A is formed on a translucent base 1 to be a pattern display face. On the other hand, a translucent electrode 4 is formed on a translucent base 2 arranged on the rear face side by photolithography method. A light shielding film 5A consisting of an electroless plating layer is formed on the electrode 3A. Then polyimide resin orientation films 6A are respectively formed on the surfaces of the bases 1, 2 by spinner method. In said constitution, a difference in the film thickness of the film 6A formed on the edge part of the display pattern part is reduced, the 'sharpness' of a pattern formed on the edge part of the film 5A can be improved and a clear display pattern can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liquid crystal display device having a light-shielding film within a liquid crystal display element, and a method for manufacturing the same.

[Prior Art] Conventionally, this type of liquid crystal display device has a pair of light-transmitting electrodes 3, 3 and 4 on opposing surfaces of light-transmitting substrates 1 and 2, which are disposed facing each other, as shown in a cross-sectional view in FIG. A light-shielding film 5 is formed on one of the light-transmitting substrates 1 to have a desired pattern shape, and an organic alignment film is formed on the light-transmitting electrodes 3, 4 and the light-shielding film 5. 6 is formed. In addition, between the transparent substrates 1 and 2, for example, a TN (twisted nematic) type liquid crystal or a GH (guest host) type liquid crystal 7 is provided.
is twisted and oriented by 90 degrees and enclosed, and its peripheral portion is sealed with a sealant 8 to form a liquid crystal display element 9. Further, on the outer surface of this liquid crystal display element 9, a pair of polarizing plates 10.1 are arranged.
1 are arranged in parallel Nicols or orthogonal Nicols.

“Problem to be solved by the invention” However, the liquid crystal display device configured in this way,
A light-shielding film 5 made of an organic material is formed on one of the light-transmitting substrates 1 on which the light-transmitting electrode 3 is formed, and an organic alignment film 6 is further formed on this light-shielding film 5. Therefore, the thickness of the light shielding film 5 made of organic material is about 2 μm, which is a very large difference compared to the thickness of the organic alignment film 6 of 800 to 1000. As shown in , the thickness t of the organic alignment film 6 at the edge portion of the display pattern portion becomes thicker, resulting in a problem that visibility is reduced.

To solve this problem, as shown in FIG. 6, an organic alignment film 6 is formed on a transparent substrate 1 on which a transparent type $i3 is formed, and an organic alignment film 6 is formed on this organic alignment film M6. A liquid crystal display device in which a light-shielding film 5 made of a substance is formed has been proposed, but in such a configuration, since the light-shielding film 5 made of an organic substance is thick, an in-plane spacer sneaks into it, and the gap in the liquid crystal display element 9 is However, the particle size or tube diameter of the in-plane spacer does not match and becomes large, and in order to obtain the desired cell gap, there are many factors that must be controlled, making it difficult to manufacture the liquid crystal display element 9. There was a problem.

[Means for Solving the Problems] In order to solve these problems, the liquid crystal display device according to the present invention includes electroless plating on a part of the transparent electrode formed on one of the transparent substrates. A light-shielding film consisting of layers is provided, and an organic alignment film is provided on these light-transmitting electrodes and the light-shielding crotch.

The method for manufacturing a liquid crystal display device according to the present invention also includes a step of forming a light-shielding film on a light-transmitting electrode formed on a light-transmitting substrate, forming a photoresist pattern, and degreasing and activating the opening of the photoresist pattern. The photoresist pattern is formed by a step of forming an electroless plating layer in the opening of the photoresist pattern, and a step of removing the photoresist pattern.

[Function] In the present invention, since a light-shielding film is provided by electroless plating on the light-transmitting electrode, the film thickness t (see FIG. 5) of the organic alignment film formed at the edge portion of the display pattern is thin. Become.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a main part of an embodiment of a liquid crystal display device according to the present invention, and the same parts as those in the previous figures are given the same reference numerals. In the figure, a light-transmitting electrode 3A as a common electrode made of ITO doped with Pd is formed over the entire surface of a light-transmitting substrate 1 serving as a pattern display surface.

On the other hand, on the back side of the transparent substrate 2 facing the transparent substrate 1-, a transparent electrode 4 as a display segment is formed by patterning by photolithography. Further, on the light-transmitting electrode 3A as a common electrode formed on the light-transmitting substrate 1, a light-shielding film 5A made of an electroless plating layer and having a thickness of approximately 5000 mm is formed in a desired pattern shape. has been done. Furthermore, these transparent electrodes 3A
On the transparent substrate 1 on which the light shielding film 5A is formed and on the transparent substrate 2 on which the opposing transparent electrode 4 is formed, a polyimide resin alignment film of a high temperature baking type (325° C.) is formed. 6
A is formed with a thickness in the range of 850 to 1000 by a spinner method or a roll coater method.

FIGS. 2(a) to 2(d) are cross-sectional views illustrating an embodiment of the method for forming the above-mentioned light shielding film 5A. In the figure, first, a photoresist film 2 is placed on a transparent electrode 3A formed on the entire surface of a transparent substrate 1, as shown in FIG.
0, a resist pattern 21 of desired dimensions is formed to provide an opening 22, as shown in FIG. 2B. Next, clean the inside of these openings 22 with IT○ cleaner (manufactured by Okuno Pharmaceutical).
After degreasing for 3 minutes at about 50℃, washing with water,
Subsequently, activation treatment is performed with, for example, a 1% sulfuric acid solution, and after washing with water, the insides of these openings 22 are coated with N1-P electroless plating (manufactured by Okuno Pharmaceutical Co., Ltd.: ITO-7).
0.83℃ or manufactured by Nippon Kazenin: 5I3-55-
1.63°C) to a thickness of approximately 5°C as shown in Figure (d).
This can be easily formed by forming a light shielding film 5A of 1,000 yen and subsequently removing the resist pattern 21.

The liquid crystal display device configured in this way has a transparent electrode 3A.
The part covered with the upper light-shielding film 5A is blocked from light regardless of whether or not the liquid crystal molecules of the liquid crystal 7 are oriented, and the part where the light-shielding film 5A is not present, that is, the part where the desired display pattern is formed, is a transparent electrode. 3A.

When a voltage is applied between 4, the long sleeves of the liquid crystal molecules are aligned parallel to the voltage application direction. Therefore, the pair of polarizing plates 10
．． If 11 is a parallel Nicol, light will pass through it, and if it is a crossed Nicol, it will block light. Note that the opposite is true when no voltage is applied or when the transparent electrodes 3A and 4 are not present. This allows the desired display pattern to be clearly displayed.

According to such a configuration, the difference in film thickness of the organic alignment film 6A formed at the edge portion of the display pattern portion is reduced;
The pattern is almost uniform on the surface of the light-transmitting electrode 3A, and the pattern at the edge portion of the light-shielding film 5A has good "sharpness", resulting in a clear display pattern.

FIG. 4 is a sectional view showing another embodiment of the liquid crystal display device according to the present invention, and the same parts as in the previous figures are given the same reference numerals. In this figure, the difference from FIG. 1 is that a color filter 12 is formed on the transparent electrode 4, which becomes the segment electrode on the back side facing the transparent electrode 3A on the display surface side. According to the configuration, a clear color display pattern can be obtained.

In the above-described embodiments, a 90 degree twisted orientation was used as the structure of the liquid crystal cell, but it goes without saying that, depending on the type of liquid crystal, for example, a homogeneous orientation or a homeotropic orientation may be used.

[Effects of the Invention] As described above, according to the present invention, a light-shielding film made of an electroless plating layer is provided on a part of the light-transmitting electrode formed on one side of the light-transmitting substrate, and these light-transmitting By providing an organic alignment film on the polar electrode and the light-shielding crotch, the light-shielding film of the present invention is formed thinner than an organic light-shielding film, so almost no change in the organic alignment film at the edge of the light-shielding film is observed. , a clear display pattern can be obtained, and visibility can be greatly improved. In addition, the light-shielding film is applied to a light-shielding film through a step of forming a photoresist pattern on a light-transmitting electrode formed on a light-transmitting substrate, a step of degreasing and activating the opening of the photoresist pattern, and a step of degreasing and activating the opening of the photoresist pattern. By forming the electrolytic plating layer and removing the photoresist pattern, alignment with the light-transmitting electrode pattern is extremely easy, and the light-shielding film can be formed extremely easily, simplifying the manufacturing process. It was possible to shorten the time considerably. Further, regarding the setting of the cell gap, the light-shielding film formed by the electroless plating layer is not submerged by the in-plane spacer, and can be controlled to a certain degree of variation by selecting the particle size (tube diameter). Furthermore, when performing high-temperature baking of the organic alignment film, it is also possible to simultaneously perform heat treatment to increase the adhesion strength between the electroless plating layer and the transparent electrode.
Extremely excellent effects such as a light-shielding film with good adhesion can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of an embodiment of a liquid crystal display device according to the present invention, and FIGS. 3 is a sectional view showing the structure of another embodiment of the liquid crystal display device according to the present invention, FIG. 4 is a sectional view showing the structure of a conventional liquid crystal display device, and FIG. 5 is a sectional view showing the structure of a conventional liquid crystal display device. FIG. 6 is an enlarged cross-sectional view of a main part explaining the problem of the above, and FIG. 6 is a cross-sectional view showing the structure of a liquid crystal display device that has been proposed in recent years. 1.2...Transparent substrate, 3A, 4...Transparent electrode, 5A...Light shielding film, 6A...Organic alignment film, 7
...1 Liquid crystal, 8...Sealing agent, 9゛...Liquid crystal display element, 1.0.11...Polarizing plate, ]2...
・Color filter. Patent applicant G-Eco Co., Ltd.

Claims (2)

[Claims] (1) In a liquid crystal display device in which a polarizing plate is arranged on the outer surface of a liquid crystal display element formed by sealing nematic liquid crystal between two transparent substrates having a pair of transparent electrodes facing each other. , a light-shielding film made of an electroless plating layer is provided on a part of the light-transmitting electrode formed on one of the light-transmitting substrates,
A liquid crystal display device characterized in that an organic alignment film is provided on the light-transmitting electrode and the light-shielding film. (2) In claim 1, the light shielding film includes a step of forming a photoresist pattern on a light-transmitting electrode formed on a light-transmitting substrate, and a step of degreasing and activating the opening of the photoresist pattern. . A method for manufacturing a liquid crystal display device, comprising the steps of: forming an electroless plating layer within the opening of the photoresist pattern; and removing the photoresist pattern.