JPH0569429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a liquid crystal display element that enables borderless display by providing at least one electrode with a two-layer structure.

[Conventional technology and problems]

BACKGROUND ART Conventionally, borderless display using a liquid crystal display element has been achieved by forming at least one of the segment electrodes and the common electrode into a two-layer structure. That is, for example, as shown in FIG. 3, in the liquid crystal display element 1, transparent electrodes 4 and 5 are provided on opposing surfaces of two glass substrates 2 and 3, which are arranged parallel to each other. here,
The lower surface of the upper glass substrate 2 is provided with a transparent electrode 4 that should serve as a normal single-layer common electrode, while the upper surface of the lower glass substrate 3 is provided with a transparent electrode 5 that should serve as a two-layer pattern electrode. Be prepared.
This two-layer structure transparent electrode 5 is first formed on a glass substrate 3.
A transparent electrode layer 5a having a predetermined first pattern as a first layer is formed on the upper surface of the transparent electrode layer 5a, and then an insulating film 5b such as SiO ₂ is formed over the entire surface, and then
A transparent electrode layer 5c having a second pattern complementary to the first pattern on the insulating film 5b.
It is constituted by the formation of

After the transparent electrodes 4 and 5 were formed on the opposing surfaces of the glass substrates 2 and 3 in this way, the transparent electrodes 4 and 5 were formed on these surfaces so as to have an appropriate alignment direction from above each transparent electrode 4 and 5. Alignment film (not shown)
are arranged, and further these two glass substrates 2,
Liquid crystal 6 is injected into the space between 3 and sealed with a sealing material 7 applied around the space, thus completing the liquid crystal display element 1.

However, in the liquid crystal display element 1 configured in this way, the lower transparent electrode layer 5 of the transparent electrodes 5 provided on the upper surface of the lower glass substrate 3
Since the insulating film 5b is formed on the transparent electrode layer a, when a voltage is applied between the transparent electrodes 4 and 5, a voltage drop occurs due to the insulating film 5b, which causes the lower transparent electrode layer to drop. 5a and upper transparent electrode layer 5c
Since a potential difference is generated between the transparent electrode layer 5 and
Display unevenness occurs due to the difference in density between the display pattern by a and the display pattern by the transparent electrode layer 5c.

[Purpose of the invention]

In view of the above points, the present invention has been developed to prevent a potential difference from occurring between a first transparent electrode layer and a second transparent electrode layer of a two-layer transparent electrode, so that display unevenness does not occur. The purpose of the present invention is to provide a liquid crystal display element that has the following characteristics.

[Means and actions for solving problems]

According to the present invention, at least one of the transparent electrodes formed on opposing surfaces of two glass substrates constituting a liquid crystal cell is first placed in a predetermined manner on the surface of the glass substrate. A first layer of transparent electrode layer having one pattern is formed, and then a resist having a second pattern of negative pattern complementary to the first pattern is formed thereon, and then a resist having a negative pattern of a second pattern complementary to the first pattern is formed thereon. After forming an insulating film and a second transparent electrode layer over the entire surface, removing the resist and simultaneously removing the insulating film and the second transparent electrode layer formed on the resist. This is achieved by a method for manufacturing a liquid crystal display element formed in a two-layer structure.

According to this invention, since the insulating film formed on the first transparent electrode layer is removed, the first transparent electrode layer does not come into direct contact with the liquid crystal in the completed liquid crystal display element. Therefore, there is no voltage drop when a voltage is applied, and the first transparent electrode layer and the second transparent electrode layer have the same potential, so the display pattern is the same. density, and display unevenness does not occur. Moreover, the patterning of the insulating film and the second transparent electrode layer can be performed in one step by simultaneously removing the insulating film and the second transparent electrode layer formed on the resist when removing the resist. Since the process is carried out using a photolithography process, the manufacturing process is not complicated, and a two-layer liquid crystal display element can be manufactured with an extremely simple structure.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of a liquid crystal display element 10 manufactured according to the present invention. In this liquid crystal display element 10, opposing surfaces of two glass substrates 11 and 12 arranged parallel to each other are shown. Transparent electrodes 13 and 14 are provided thereon, respectively.

Here, the lower surface of the upper glass substrate 11 is provided with a transparent electrode 13 which should serve as a normal single-layer common electrode, but the upper surface of the lower glass substrate 12 is provided with a transparent electrode 14 having a two-layer structure. .

The two-layer structure transparent electrode 14 is shown in FIGS. 2A to 2B.
As shown in FIG. 2, a first transparent electrode layer 14a is first formed on the upper surface of the glass substrate 12 and patterned into a predetermined first pattern (see FIG. 2A), and then a transparent electrode layer 14a is formed over the entire surface of the glass substrate 12. Tsute resist 15
is applied and exposed and developed to have a negative pattern of a second pattern complementary to the first pattern of the first transparent electrode layer 14a (second pattern).
(See Figure B). Subsequently, an insulating film 14b made of SiO ₂ or the like and a second transparent electrode layer 14c are sequentially formed on the insulating film 14b (see FIG. 2C), and then the resist 15 is removed and at the same time, the second transparent electrode layer 14c is formed on the resist 15. The insulating film 14b and the second transparent electrode layer 14c are removed (so-called lift-off). As a result, the insulating film 14b and the second transparent electrode layer 14c are patterned into the second pattern (see FIG. 2D). In this way, the transparent electrode 14 is formed on the glass substrate 12.

After the transparent electrodes 13 and 14 were formed on the opposing surfaces of the glass substrates 11 and 12 in this way, the transparent electrodes 13 and 14 were formed on these surfaces so as to have an appropriate alignment direction from above each of the transparent electrodes 13 and 14. An alignment film (not shown) is provided, and liquid crystal 16 is injected and filled into the space between these two glass substrates 11 and 12, and the space is sealed with a sealing material 17 applied around the space. Thus, the liquid crystal display element 10
is completed.

The liquid crystal display element manufactured according to the present invention is constructed as described above, and the first transparent electrode layer 14
Insulating film 14b on a and second transparent electrode layer 14
c has been removed by photolithography, when a power source (not shown) is connected between the transparent electrodes 13 and 14 and a voltage is applied, the transparent electrode 14
Since both the first transparent electrode layer 14a and the second transparent electrode layer 14c constituting the liquid crystal 16 are in direct contact with the liquid crystal 16, they have the same potential, and therefore the display pattern by both transparent electrode layers 14a and 14c is It will be displayed uniformly with exactly the same density.

〔Effect of the invention〕

As described above, according to the present invention, at least one of the transparent electrodes formed on the opposing surfaces of two glass substrates constituting a liquid crystal cell is first placed on the surface of the glass substrate in a predetermined manner. A first transparent electrode layer having a first pattern is formed, and then a resist having a second negative pattern complementary to the first pattern is formed thereon; After forming an insulating film and a second transparent electrode layer over the entire surface, the resist is removed, and at the same time, the insulating film and the second transparent electrode layer formed on the resist are removed. In this way, since the manufacturing method of the liquid crystal display element is configured to form a two-layer structure, the insulating film formed on the first transparent electrode layer is removed, so that the completed liquid crystal display element In this case, the first transparent electrode layer is in direct contact with the liquid crystal, and no voltage drop occurs when a voltage is applied. Therefore, since the first transparent electrode layer and the second transparent electrode layer have the same potential, their display patterns have the same density and display unevenness does not occur. The patterning of the transparent electrode layer of the layer is performed by simultaneously removing the insulating film and the second transparent electrode layer formed on the resist when removing the resist.
Since this is carried out in a single photolithography process, a two-layer liquid crystal display element can be manufactured with an extremely simple structure without complicating the manufacturing process.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a liquid crystal display element manufactured according to the present invention, and FIG. 2 is a schematic sectional view showing the steps of forming a two-layer transparent electrode on a glass substrate. FIG. 3 is a schematic cross-sectional view showing an example of a conventional liquid crystal display element having a two-layer structure of transparent electrodes. 10...Liquid crystal display element, 11, 12...Glass substrate, 13, 14...Transparent electrode, 14a...First layer transparent electrode layer, 14b...Insulating film, 14c...
Second layer transparent electrode layer, 15...Resist, 16...
...Liquid crystal, 17...Sealing material.

Claims (1)

[Claims] 1. At least one of the transparent electrodes formed on opposing surfaces of two glass substrates constituting a liquid crystal cell is first coated with a first layer having a predetermined first pattern on the surface of the glass substrate. A transparent electrode layer is formed, then a resist having a negative pattern of a second pattern complementary to the first pattern is formed over the transparent electrode layer, and then an insulating film and a resist are formed over the entire surface. After forming two transparent electrode layers, removing the resist and simultaneously removing the insulating film formed on the resist and the second transparent electrode layer to form a two-layer structure. A method for manufacturing a liquid crystal display element, characterized by: