JPH10268264A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce or prevent crosstalk by making lower the resistance of a transparent electrode by forming a plating layer on the flank of the transparent electrode. SOLUTION: On a glass substrate 2 as the transparent electrode, a striped transparent electrode 3 formed of ITO is patterned by sputtering and photolithography, and the conductive plating layer 13 is formed of a metal film of Cr, Al, etc., on the flank along the length of the striped transparent electrode 3. Then the striped transparent electrode 3 is coated with a smoothing film 4 formed of acrylic resin, SiO2 , etc., and an orientation film 5 is formed of polyimide resin, rubbed in a constant direction, by coating to form one member. On a glass substrate as the other transparent substrate, a light shield film 8 formed of Cr, etc., a color filter 7 consisting of respective pixel areas of red, green, and blue, a smoothly film 9, a transparent electrode 10 crossing the transparent electrode 3 at right angles, and an orientation film 11 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having improved wiring resistance of a transparent electrode.

[0002]

2. Description of the Related Art FIG. 2 is an enlarged cross-sectional view of a main part of a conventional STN type simple matrix type color liquid crystal display device 1. And acrylic resin or S
A smoothing film 4 made of iO ₂ or the like and an alignment film 5 made of a polyimide resin rubbed in a certain direction are sequentially formed,
On the other glass substrate 6, a large number of colored films 7 (R, G, and B represent red, green, and blue colored films, respectively) and a light-shielding film 8 made of Cr or the like are arranged. ing.
Further, a smoothing film 9 made of an acrylic resin, SiO ₂ or the like, and a transparent electrode 10 made of ITO in a stripe pattern arranged in a large number of parallel are formed, and a polyimide resin rubbed in a certain direction on the transparent electrode 10 is formed. Alignment film 11
Is formed. In addition, without providing the smoothing film 4,
The alignment film 5 may be formed directly on the transparent electrode 3.

Then, the two glass substrates 2 and 6 are brought close to each other so that the film forming surfaces thereof face each other, the liquid crystal layer 12 is sealed therebetween, and a number of spacers (not shown) are arranged. And the transparent electrodes 3 and 10 are bonded so as to be arranged orthogonally to each other.

In order to manufacture the color liquid crystal display device 1 having the above structure, a film is formed in a pattern by a thin film forming technique such as sputtering or vapor deposition and a photolithography method, or a film is formed by a coating method. Then, there is a step of injecting the liquid crystal 12 after the bonding step.

[0005]

However, the display surface of the color liquid crystal display device 1 having the above-described structure is VGA (dot 640 × 480) or SVGA (dot 800 × 600).
As the resolution becomes higher or the size becomes larger, the transparent electrode 3,
Although it is necessary to lower the resistance of No. 10, there is a problem that a sufficiently low resistance has not yet been achieved.
In order to reduce the resistance of the transparent electrodes 3 and 10, it is conceivable to increase the thickness. However, on the other hand, there is a problem that the transmittance is deteriorated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a liquid crystal display device in which the resistance of a transparent electrode is further reduced to reduce or prevent crosstalk.

[0007]

According to the liquid crystal display device of the present invention, a pair of members each having a stripe-shaped transparent electrode and an alignment film sequentially formed on a transparent substrate are formed so that both transparent electrodes are orthogonal to each other. And a liquid crystal layer interposed therebetween, wherein a plating layer is formed on a side surface of the transparent electrode.

[0008]

FIG. 1 is an enlarged sectional view of an essential part of an STN type simple matrix type color liquid crystal display device 1a according to the present invention, and FIG. FIG. 4 is a process chart showing a conventional method for producing a transparent electrode. In these drawings, the same parts as those of the conventional color liquid crystal display device 1 are denoted by the same reference numerals.

According to the color liquid crystal display device 1a, a stripe-shaped transparent electrode 3 made of ITO is formed on the glass substrate 2 serving as the transparent substrate by sputtering and photolithography. A conductive plating layer 13 formed of a metal film such as Cr or Al is formed on a side surface extending in the longitudinal direction. An acrylic resin or SiO 2 is applied to the stripe-shaped transparent electrode 3.
_An orientation film 5 made of polyimide resin, which is coated with a smoothing film 4 made of ₂ or the like and further rubbed in a certain direction, is applied and formed, thereby forming one member.

A light-shielding film 8 made of Cr or the like is provided on a glass substrate 6 as the other transparent substrate, and a color filter 7 is applied and patterned by a photolithography method. The color filter 7 includes red (R), green (G), and blue (B) pixel regions. Then, on the color filter 7, a smoothing film 9 made of acrylic resin or silica and a plurality of transparent electrodes 10 made of ITO arranged in parallel with each other are formed. I have. Further, an alignment film 11 made of a polyimide resin rubbed in a certain direction is formed on the transparent electrode 10.

Then, a liquid crystal layer 12 (for example, a chiral nematic liquid crystal twisted at an angle of 250 °) is sealed between one member and the other member, and a large number of spacers (not shown) are arranged and bonded. . Further, although not shown, a retardation film and a polarizer are provided outside each of the one member and the other member.

[0012] The method for manufacturing a transparent electrode First, a transparent electrode 3 where the plating layer 13 is formed by the 3
Will be described in detail. As in the step (a), the transparent conductive film 14 is formed on the glass substrate 2 by sputtering or vacuum deposition. Next, as in the step (b), an electrode pattern is provided with the photoresist 15 by photolithography. Then, as in the step (c), the transparent conductive film 1 is etched with an etching solution such as a mixture of ferric chloride and hydrochloric acid.
4 to form a transparent electrode 3 and then (d)
As in the step, a plating layer 13 is formed on the side surface by plating, and finally, as in the step (e), the remaining photoresist 15 on the transparent electrode 3 is peeled off.

By the way, in the conventional method for manufacturing a transparent electrode shown in FIG. 4, steps (A) to (C) are (a)
This is the same as the steps (c) to (c). In the last step (D), the remaining photoresist 15 on the transparent electrode 3 is removed.

Thus, the color liquid crystal display device 1 having the above-mentioned structure is provided.
In (a), even if the transparent electrode 3 alone is used, a relatively low resistance value is exhibited. However, since the plating layer 13 is formed on the side surface extending in the longitudinal direction of the transparent electrode 3, the resistance can be further reduced. Crosstalk can be reduced or prevented from occurring, and a good display screen can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes and improvements may be made without departing from the spirit of the present invention. For example, a similar effect can be obtained by using a monochrome liquid crystal display device instead of the color liquid crystal display device. In addition, although the case where the plating layer 13 is formed on the transparent electrode 3 of one member is illustrated, the same effect can be obtained by providing the plating layer on the transparent electrode 10 of the other member.

[0016]

As described above, according to the present invention, by forming the plating layer on the side surface extending in the longitudinal direction of the transparent electrode, the resistance of the transparent electrode is further reduced, and the crosstalk is reduced or generated. As a result, a high-performance and highly reliable liquid crystal display device can be provided.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a liquid crystal display device of the present invention.

FIG. 2 is an enlarged sectional view of a main part of a conventional liquid crystal display device.

FIG. 3 is a process chart showing a method for manufacturing a transparent electrode in the liquid crystal display device of the present invention.

FIG. 4 is a process chart showing a method for manufacturing a transparent electrode in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Color liquid crystal display device 2, 6 Glass substrate 3, 10 Transparent electrode 4, 9 Smoothing film 5, 11 Alignment film 7 Coloring film 8 Light shielding film 12 Liquid crystal layer 13 Plating layer 14 Transparent conductive film 15 Photoresist

Claims (1)

[Claims] 1. A pair of members formed by sequentially forming a stripe-shaped transparent electrode and an alignment film on a transparent substrate, respectively.
1. A liquid crystal display device comprising a liquid crystal display device bonded via a liquid crystal layer such that both transparent electrodes are orthogonal to each other, wherein a plating layer is formed on a side surface of the transparent electrode.