JPS5823018A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To enhance the reliability of a liq. crystal display element by forming an Ni-Cr alloy layer having a specified thickness on a transparent electrode at the lead takeout part to prevent the corrosion of the lead takeout part. CONSTITUTION:A front transparent substrate 1 and a back transparent substrate 2 having transparent electrodes 5, 6 formed on the insides, respectively are sealed with sealants 3, 4. A transfer 7 is formed in the sealant 4 to connect the electrode 6 to the front substrate side, thereby forming a lead takeout part 8 together with the electrode 5. On the part 8 an alloy layer 9 of an Ni-Cr alloy consisting of 70-90wt% Ni and 10-30wt% Cr or an Ni-Cr-Fe alloy consisting of 40-90wt% Ni, 10-30wt% Cr and 0-30wt% Fe is formed by sputtering in 100-10,000Angstrom thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid ratio display pendulum in which the corrosion resistance of the lead extraction part for extracting 11 poles is improved.

2. Description of the Related Art Liquid crystal display devices (LCDs) are widely used as low-intellectual, flat-panel display devices, mainly in watches, calculators, and the like. This LCD has low power consumption and is usually built on a board.
A transparent electrode of 203-8n02 is vapor-deposited, and in many cases, this # layer is extended to the lead extraction portion for connection to an external circuit.

However, this transparent electrode is extremely thin and is exposed to the outside air at the lead extraction part provided outside the llCD cell.
The moisture in the air tends to cause corrosion, reducing the reliability of the LCD. This is particularly problematic when the device is placed in an unsealed environment with a large temperature difference.

To prevent this corrosion, conventional methods include vacuum deposition of chromium, gold, etc., electrolytic plating, screen printing with conductive paste, coating of water repellent, fixation of metal leads, and resin sealing after circuit connection. There were many signs of suspension.

However, in the vacuum evaporation method, the substrate is heated in the evaporation equipment, making it difficult to achieve mask precision, and in the electrolytic plating method, a wet process is required, which tends to lead to lot-to-lot variations, poor productivity, and In the printing method, it is difficult to print a thin film of 10 μm or less, and if it is too thick, the gap between the substrates becomes wide, which tends to cause poor sealing and poor LCD characteristics, which is problematic. In addition, the method of applying a water repellent is that the water repellent can be removed during the cleaning process, so one LC
Applying a water repellent after assembly to D results in poor work efficiency, and if handled improperly, the water repellent may fall off, so the full effect is often not achieved.

<F h ') - Although it is useful for specific applications, the productivity is extremely poor and it cannot be applied to all general LCDs, and resin sealing makes it impossible to replace the LCD. υI can't say it's practical.

The present invention aims to be able to manufacture LCDs while preventing such drawbacks, and in a liquid crystal display confectionery in which a part of the transparent electrode provided on the substrate is used as a lead extraction part. An alloy layer containing nickel and chromium as main components is formed on the transparent electrodeposition of the lead extraction portion by sputtering to a thickness of 100 to 100 mm.

This is a liquid crystal display element characterized in that it is arranged in the shape of an X. .

The liquid crystal display element of the present invention is N1-C! Since the r-based alloy layer is densely provided on the transparent electrode, the lead extraction part will not be corroded by moisture in the air, making the LCD highly reliable.Also, since it is performed by sputtering, it does not require a mask. And the substrate is not heated to high temperatures, and the precision is high.
Even when a large number of LCDs are manufactured at the same time, and even when a large number of lead extraction portions are formed in a large LCD, a highly accurate alloy layer can be formed.

Furthermore, the thickness of the alloy layer can be freely controlled to the order of 100 to 1000, making it possible to obtain sufficient corrosion resistance and to prevent sealing defects from occurring.

Next, a more detailed explanation will be given with reference to the drawings.

FIG. 1 is an explanatory end view of a typical example of the LCD of the present invention, in which the front transparent substrate (1) and the rear transparent substrate (2) are sealed with sealants (8) and (4). Substrate (1
), (2) have transparent electrodes (5), (6) on their inner surfaces.
is formed. Of these sealants, the sealant on the right side (
A transfer (7) is formed inside the chrysanthemum for electrically connecting the transparent electrode on the front side and the transparent electrode on the back side.

Through this transfer, the back side transparent electrode is connected to the front side substrate side, and together with the front side transparent electrode, a lead extraction portion (8) is formed at the right end of the figure.

An alloy layer (9) of the present invention whose main components are nickel and chromium is formed on this lead extraction portion.

The LCD0 example shown here is merely an example, and is not limited thereto, and various applications are possible, which will be briefly explained below.

A transparent substrate such as glass or plastic can be used as the substrate, and only the back side substrate may be an opaque substrate. On the inner surface of this substrate, a transparent coating layer made of 20-day-to-day material is formed in a desired pattern, and an overcoat layer and an undercoat layer of 8102, polyimide, polysiloxane, etc. are formed as necessary.

This electrode may be laminated, or may be a reflective electrode if the back substrate is opaque, and if two or more liquid crystal layers are provided, the intermediate substrate has transparent electrodes on both sides. It is formed.

Generally, in LCDs, the lead extraction part is often concentrated on one board so that connection can be made with one connector, and transfer between side boards, including transfer within a seal as shown in Figure 1, is common. Connected by

Of course, this may be taken out from each substrate, or may be conductively connected through a transfer on the end face of the cell or through a through hole in the substrate.

- An alignment layer is formed on this electrode as necessary, and is formed by an oblique vapor deposition method, a rubbing method, etc., and a vertical alignment agent may be applied as necessary.

In the present invention, after forming the transparent electrode and before sealing, an alloy layer containing nickel and chromium as main components is formed by sputtering.

This sputtering process can be carried out using ordinary sputtering equipment, and is usually performed under a vacuum of 10 Torr or higher.
An alloy layer is formed to a thickness of 100 to xooooA using an alloy of -0r or Ni-0, r-B'e yarn.

The alloy whose main components are Ni and Or is Ni70~90
wt Chi, Or 10-30 wt Chi, N1-C
! In r-Fe alloys, Ni 40-90 vrt%
, Or] O~30 wt%, IFe O~30 w
t%, and an alloy coating with excellent corrosion resistance can be easily formed within this range.

In addition, the thickness of the alloy layer is 100 to 100OOX, and 1o
If it exceeds 1000 x, the corrosion resistance will be significantly improved, and if it exceeds 100 x, there will be a risk of seal failure. fH is preferably 300 to 5oooX.

However, from the viewpoint of productivity and economy, it is 300 to 2000
It is said to be about X. A metal mask formed into a desired shape is placed on the substrate and placed in a sputtering device to form an alloy layer.

For the sealing material, ordinary sealing materials can be used, such as epoxy resin, silicone resin, thermosetting resin such as glass frit, photocuring resin, inorganic sealant, etc. Glass fiber, AlzOa, etc. can be used in the sealing material or in the cell. Used with spacers such as particles.

After that, liquid crystal is injected into the cell and the injection port is sealed.

In the above explanation, only the basic structure of the LCD has been explained, but it is also possible to provide a fixed display part, print characters, symbols, etc. on the substrate, provide a polarizing plate in one layer, or 2.
It is also possible to form a multilayer LCD with more than one layer.

In addition, the present invention is suitable for manufacturing a large number of LCDs at the same time, and has extremely high productivity because a large number of Ni-0r alloy layers can be formed at once on a substrate that is not individually cut before sealing. good.

Next, an explanation will be given based on examples.

As the pattern, a clock hour and minute display pattern was used, and electrode patterns were formed on the glass substrate by etching on the front and back sides so as to form lead extraction parts on both sides.
Using a metal mask on this lead extraction part, Ni-C
An r-based alloy layer was formed.

This sputtering takes approximately 60 minutes to
X 10” Torr, then Ni 80wt
%, Cr20vvt% alloy for 05 minutes, 010
A sputtering process was performed for a minute.

As a result, in ■, approximately 500 × f) Ni-Cr layer,
In case (2), a Ni--Cr layer of about zooooX was formed.

Thereafter, it was rubbed, sealed with an epoxy resin sealant, liquid crystal was injected, sealed with epoxy resin, and cut into individual cells.

The cells of this LCD are all 80℃, 90%RH, 5
Even in the 00-hour moisture resistance test, the lead extraction part showed no defects and was excellent.

As described above, the present invention significantly improves the corrosion resistance of the lead extraction portion, and is an excellent product that can be applied to various uses in the future.

[Brief explanation of drawings]

FIG. 1 is an explanatory end view of a typical example of the LCD of the present invention. 1.2... Base board 5.6...Transparent electrode 9...Alloy layer

Claims (1)

[Claims] (1) In a liquid crystal display element in which a part of the transparent electrode provided on the substrate is used as it is as a lead extraction part, an alloy layer mainly composed of nickel and chromium is sputtered on top of the transparent box of the lead extraction part. 1. A liquid crystal display element, characterized in that the liquid crystal display element is provided to have a thickness of 100 to 10,000 A.