JPS5834430A - liquid crystal display device - Google Patents

Abstract

PURPOSE:To avoid the disconnection and exfoliation of a transparent electrode pattern, by providing a thin film of polyimide resin at the interface between the foundation film of a metallic oxide or the transparent electrode on a glass substrate and a sealing material. CONSTITUTION:Foundation films 12 and 12' made of metallic oxide and electrode patterns 13 and 13' formed with a transparent conductive film of a desired form plus the liquid crystal orientation controlled films or insulated films 14 and 14' are provided on glass substrate 11 and 11'. These substrates 11 and 11' are set so that the patterns 13 and 13' are opposite to each other, and the peripheral area of these substrates are sealed with a sealing material 16. Then thin films 17 and 17' of polyimide resin are provided at the interface between the material 16 and the films 12/12 or the draw-out lines of the patterns 13/13', and a twisted nematic liquid crystal 15 is enclosed into the space between the films 17 and 17'. Thus the polyimide resin functions as a buffer material. As a result, the disconnection and the exfoliation due to temperature/humidity cycle can be effectively avoided for the electrode pattern although the thickness of the foundation film is set to >=3,000Angstrom .

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a liquid crystal display device i'J? having a base film made of a metal oxide. It is related to the improvement of VC.
1d lower part 111 also relates to a liquid crystal display device that prevents disconnection and peeling of transparent electrodes, which are particularly likely to occur when the number of membranes is 3000 or more.

Generally, a liquid crystal display device having a base film has a glass substrate 1, as shown in FIG. Base films 2, 2' made of metal oxides such as silicon oxide, aluminum oxide, titanium oxide, etc. are formed on I'.
The base layer is formed by adding tin oxide (5n) to the base layer.
O2) or indium oxide (In 2 C1a)
Electrode patterns 3 and 3' made of a transparent conductive film of the shade are provided, and a liquid crystal alignment control film (or insulating film) 4 and 4' for aligning the liquid crystal in a certain direction is formed thereon, and a liquid crystal 5 is formed between these. It has a structure in which the amount is controlled and fixed in a twisted nemajinok type, and the periphery is sealed with a seal.

In a liquid crystal display device with a diameter of 4, if an organic polymer film such as polyimide is used as a liquid crystal alignment control film that aligns liquid crystals in a certain direction, the liquid crystal One problem is that when the display device is turned on, the liquid crystal molecules in the vicinity of the electrode pattern are also turned on.In order to eliminate this problem, conventional methods used a substrate l as shown in Figure 1 above. A liquid crystal display device with 1000 to 1000 liters has been developed and put into practical use.
Increasing the thickness of the base layer by 3°, which is 600″A culm, will further improve the occurrence of defects as described above, and will improve the quality of liquid crystals using inorganic liquid crystal alignment. Even if you turn on the display device t'll, the DC Kamigawa surface / 1 problem will be improved. However, on the other hand, this ": temperature 1 degree cycle test on the liquid crystal display device, flf + l! Il!
, If a 11Ol cycle test etc. is applied, there may be a problem that the electrical wire 7tl under the seal 4A is disconnected or peeled off 1!11N, and this defect is especially caused by the
This was apparent when the thickness of the 11-layer was set to 3o f] (1'A or more).The cause of such defects is the heat of the base film made of gold By increasing the expansion rate or the thickness of the base layer, it becomes much larger than expected compared to a thin l-type base, and therefore tin oxide (Sn02)
In particular, the coefficient of thermal expansion of the transparent electrode made of indium oxide (In203) and the thermal expansion coefficient of the seal made of 7J resin is determined by ρ.
It is thought that the lower transparent electrode pattern lead wire is broken or exposed.

The present invention has been made in view of the above points, and the film thickness of the base film made of the metal oxide of oxidation (II JT) is reduced to 3.
(A liquid crystal display device that prevents disconnection and blistering of the transparent electrode pattern, which is particularly prone to occur when using 100 people or more.) In order to do this, the present invention provides a glass substrate provided with a base film consisting of a metal oxide. Furthermore, when a liquid crystal substance is interposed between the substrates, a seal is placed around the periphery of the liquid crystal display device (A), and a seal is placed between the base film and the transparent electrode. In this way, the interface between the sealing material and the base film (by providing a polyimide organic polymer film) prevents disconnection and peeling of transparent commercially available patterns. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view showing the structure of one of the substrates of an embodiment of the liquid crystal display device of the present invention, and FIG. 3 is a sectional view of the device of the embodiment of the present invention.

In FIGS. 2 and 3, a base film 12.12' made of a metal oxide such as silicon oxide, aluminum oxide, titanium oxide, etc. is formed on a glass substrate 11°11'. 'u- with desired shape of tin oxide (5nO2)i
An electrode pattern 13.13' made of a transparent conductive film such as indium oxide (In203) or indium oxide (In203) is provided. .14' is provided, and the glass substrate 11. ll' is the electrode pattern 13°13
' are made to face each other, and the liquid crystal 15 is placed between them.
is interposed to regulate the orientation in a twisted nematic type and to hold it fixedly, the peripheral portion is weighed against the seal member 16, and furthermore, this seal material I6 and the base material 11
2, 12' interface and seal ('AI6 and transparent type, sales pattern 13.13' thin I+' force 17, I 7' made of polyimide organic polymer phase at the interface of the lead line of sales pattern 13.13'
is provided.

” 2, the seal IJ 16 and the base film 1
2. Polyimide-based material provided at the interface with 12'
:11'' IT of 5 molecules 11, 17' acts as a buffer material, effectively preventing disconnection and peeling of the transparent electrode patterns 13 and 13'.] Figure 4 shows another embodiment of the device of the present invention. It is a sectional view, and the second
The same parts as in the figures and FIG. 3 are indicated by the same reference numerals.

FIG. 4 shows a case in which a polyimide-based organic polymer 1 model is used for the liquid crystal extenuating amount control film 18.18' that aligns the liquid crystal 15 in a certain direction, and the liquid crystal one direction control film 18.18' is used as the sealing material 16. With a configuration that extends all the way to the bottom, this seal is made up of 1
The liquid crystal 4-way control 18, 18' located at the interface of the seal cover 16, the base film 12, 12' and the electrode pattern 13, 1g' lead line prevents disconnection of the transparent electrode pattern. (d゛Prevents scuffing. 1: It is made like this.

According to the present invention, as described in Section 2 below, in a liquid crystal display device in which a base film made of a metal oxide such as silica oxide is coated with a base film made of a metal oxide such as silica oxide, etc. (
By providing a C polyimide polymer membrane, this polyimide polymer acts as a buffer 4, +
Even if the thickness of the base film is 3oooA or more, transparent molds and commercial patterns due to temperature cycle or temperature/humidity cycle, especially disconnection of the lead wire under the seal 14, may occur. 19) The reliability of 1::f
Figure 1 is a sectional view showing the structure of a conventional device, and Figure 2 is a substrate structure of an embodiment of the device of the present invention. Fig. 4 is a perspective view of an embodiment of the device of the present invention; Fig. 3 is a cross-sectional view showing a structure of an embodiment of the device of the present invention;
1, 11, 11'...Glass substrate, 12.12'
・Underlying film, 13.13' ・Transparent electrode, 1
4゜14'...Liquid crystal-e surface control 1 (ψ, I5...
・Liquid crystal, 16...Sealing material, IT, I7'
...Polyimide resin: Thin 11φ, 18
．． 18'...1 liter of liquid crystal made of polyimide resin
Le direction system quotient + 113';.

Attorney Aihiko Fuku Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A thin film of a transparent electrode is provided on a base film made of a metal oxide/glass substrate, and an extenuating amount control film or an insulating film is provided on the glass substrate, and a liquid crystal material is provided between the substrates. In a liquid crystal display device sealed with a sealing material at the part (jη), a thin film made of polyimide resin is applied to the !/, !- faces of the seal H and the base film or the transparent mold 1. A liquid crystal display device fl'l I, 2, characterized in that the liquid crystal extenuating amount control 1 model is formed from a polyimide-based 41'iJ resin, and the orientation control 1 model is sealed 1'. 1.) Extend the I part with a cutter and provide it at the interface between the seal 4g and the underlying film or transparent electrode. The liquid crystal display device according to claim 1, characterized in that a thin film made of a polyimide resin is formed.