JPS58139115A - Production of field effect type liquid crystal display element - Google Patents

Abstract

PURPOSE:To remove ionic impurities in liquid crystals and to improve operation characteristics and reliability by communicating the opening parts of two cases, and injecting the liquid crystals from the 2nd case to the 1st case under application of DC voltage to the electrodes of the 2nd case. CONSTITUTION:Two sheets of substrates 2, 2' having electrodes are placed so as to face each other and are fixed to each other by means of adhesive agents 3 to form a case 9 having about 10mu spacing. An opening part 5 is provided thereto. Separately, substrates 12, 12' having electrodes 11, 11' over the entire surface are fixed by means of an adhesive agent 3 so as to face each other to form a case 19 having about 10mu spacing. Opening parts 15, 16 are provided thereto. The parts 5 and 16 are connected with a flow passage 10, and while DC voltage is applied between the electrodes 11 and 11' of the case 19, liquid crystals are injected through the part 15 and are conducted through the passage 10 into the case 9, whereafter the passage 10 is disconnected and the part 5 of the case 9 is sealed. The purity of the liquid crystals in the case 9 is then made higher than the purity prior to the injection, and the field effect liquid crystal display element contg. less ionic impurities is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which it pertains] The present invention relates to a method for manufacturing a field effect liquid crystal display element.

[Prior art and its problems]

There are two types of liquid crystal display devices: current effect type and field effect type. Number p in the former line dynamic scattering mode.

It is necessary to add an ionic substance to the liquid crystal. Hiro for the latter,
In twisted nematic (abbreviated as TN) cage guest-host (abbreviated as GH) mode, addition of p1 ionic substance is unnecessary.

On the contrary, in the field effect type, if ionic substances are present as impurities, the operation** or reliability will be significantly reduced.

Conventional field-effect liquid crystal display devices are manufactured as follows. 1st lIO flat figure-), (b) and cutting line 11
k) As shown in K, since it has 2001E pole 1.1', attach 11i to 11113 so that the board LM is facing the other side.
to form a spring s19 having a weight of approximately 10,5091 g.

The container 9 is provided with an opening IIs for injecting the liquid crystal 7. In the example shown in FIG. 1(1), the inside of the container is evacuated, liquid crystal is injected through the opening IIs after death, and after the liquid crystal is filled, the opening 5 is sealed to form a liquid crystal display element.

In the example shown in Figure ls1-), an aperture 6 is provided in addition to the aperture 5, and liquid crystal is injected through the aperture 6 while being contained in the aperture 6. After death, the liquid crystal is filled. The openings 5 and 6 are sealed to form a liquid crystal display element. Therefore, in conventional propagation methods, it is necessary to sufficiently purify liquid crystals and remove impurities such as ionic substances before injection. It is known that if the liquid crystal has a single component, it can be purified using these O methods, but since liquid crystals generally have multiple components, the component ratio will change when purified using these methods. It cannot be purified because it is Therefore, even if individually purified components are used, when mixing multiple components, impurities that are mixed in during the mixing operation are...

There is no turtle by removal. Therefore, the conventional "manufacturing method" has the disadvantage that a large amount of current flows due to the impurity rounding of the liquid crystal display element line, which seriously deteriorates the operating characteristics and reliability.

[Invention OS]

The present invention has improved the above-mentioned drawbacks of the conventional manufacturing methods, and therefore provides a method for manufacturing field-effect liquid crystal display elements that removes ionic impurities and has excellent operation** and reliability. It is.

[Summary of Issue #40] In other words, in the manufacturing method of a field effect liquid crystal display panel in which a substrate is formed with two electrodes and liquid crystal is injected into nine containers, a substrate with two electrodes is formed, which is less likely to be formed than a substrate with secondary electrodes. In each case, there are at least 4 round openings for injecting liquid crystal into the container.

#t# is formed by two substrates having electrodes on the entire surface, and the container of Kurei 2 has a round 0-hole for injecting the liquid crystal and a 9-O hole for flowing out the liquid crystal. At the ninth point connecting the first and second containers, a flow path is provided between the openings of the 115l and the second container, and while applying direct current pressure between the electrodes of the 20th container, 20th trial Liquid crystal was injected through the opening in the first container, and after the liquid crystal filled the container Jll, the flow path between the first and second containers was cut, and the opening in the container GI was This is an ohm manufacturing method for a field effect liquid crystal display panel, which is characterized in that it is sealed to form a liquid crystal display element.

〔Effect of the invention〕

Therefore, according to the method for manufacturing a field effect liquid crystal display element according to the present invention, since a DC voltage is applied to the electrode of the second container when liquid crystal is injected, ionic impurities in the liquid crystal are captured on the electrode surface. The liquid crystal is purified while passing through the second container, and is led to the tenth container. Therefore, the liquid crystal in the first container has a higher V4hS degree9 and a higher resistance value than the liquid crystal in the injected liquid crystal.

As a result, according to the manufacturing method according to the present invention, a field-effect liquid crystal display element with low power consumption, excellent operating characteristics, and excellent reliability can be obtained. Furthermore, the rounding process that can be completed at the same time as the liquid crystal injection, and the time and effort required to prepare the liquid crystal in advance, are unfavorable.
It is guaranteed that it will be purified each time it is injected. Also, the DC voltage can be low.

[Embodiments of the invention]

The present invention will be explained below with reference to examples. A schematic diagram of a field effect type liquid insect display element according to the present invention is 1111211 square meters.
1lli (a), b) and cross-sectional view -).

As shown in Figure 1 and 2, bases @2 and 2' having two electrodes are fixed with an adhesive 3 so as to face each other to form a volume @9 having a width of about 1Gμ. The inner container is provided with an ON hole 5 for injecting liquid crystal.

Unfortunately, the substrate 12.12 with the electrode 11.11' on the gold mine
'W1 with brass-coated copper 13 facing each other, about 10
A volume 4619 with a space between voices is formed. A ninth hole 15 for injecting the liquid crystal into the ζO hole and a rounded hole 15 for flowing out the liquid crystal are provided. Moat 9 containers 9 and 19 II
In order to continue the flow, a flow path 10 is provided between the openings 5 and 16 using, for example, a pipe. Electrodes 11 and 1 of capacity@19
While applying a DC voltage between 1' and 1', the opening part Is of the liquid crystal is
More injected friend. In Figure 2 (-), the chambers 9 and 19 were evacuated through one hole IS, and liquid crystal was injected after death.

In FIG. 2-), an opening 6 was provided in the ridge of the container 1I9, and microcrystals were injected from the opening 1s while drawing Wk from this.

After the liquid 1 fills the container 9, the flow path 10 is opened and the 8*
*The O-holes 5 and 6 are sealed to obtain a field-effect liquid crystal display panel with less ionic impurities.

In the above example, the liquid crystal used was a commercially available biphenyl liquid crystal (
(product name: 1if-8SBDH), DC voltage: 5v
A field effect type liquid crystal display device according to the present invention was obtained by injecting liquid crystal while applying . The resistivity of the dedication display element obtained by the conventional method is 2 x 1090 cm, while the resistivity of Takaaki Moto's liquid crystal display element is Fil x H) loΩcm, which reduces power consumption and provides a long battery life when used as a display device. Become.

The above liquid crystal display element was tested for accelerated deterioration by applying 80V AC at a high temperature of 60°C.
In contrast to the case where the deterioration of the orientation regresses from the IIL reef side part where the electric field strength is high after 0 hours or less, the device according to the present invention has high reliability with almost no abnormalities found in 1# after 100 hours or more. A thing and a friend.

Historically, it has been known that an IToK insulating film can be added to each electrode to improve the reliability of the device, but for example, if the insulating film is coated with about 1 soojl of polyimide resin, the device produced using the O-O manufacturing method will be Because the current is large, 32)i
At the sO frequency, the contrast decreases significantly;
No reduction in contrast was observed in the device manufactured by the manufacturing method of the present invention.

As shown above, according to the method for manufacturing a field effect liquid crystal display element according to the present invention, a liquid crystal display element with excellent operating characteristics and 4 Mm property can be obtained.

[Other embodiments of the invention]

FIG. 3 shows another embodiment according to the present invention. When forming a container having a distance of about 10μ by fixing the substrates 2.21 having two electrodes so as to face each other with the adhesive 3,
One or more first containers 9 and the 20th container @19 may be integrally formed as shown in No. 2111 so that the openings of each container are connected by the flow path 10.

For example, one of the substrates 2 and 210 is the substrate mK.

Form the adhesive 3 as shown in Figure @2, and use the other side (D!i+Ii
: Overlap ll1 or more I! in flow path lO! -1) 9th opening 15f for liquid crystal injection into 9: The opening 15f is integrally formed with the 9th container 19 in series. In this manner, liquid crystal is injected through the opening 15 while applying a DC voltage to the electrode of the container 19.

After the containers 419 are filled with liquid crystal, the cutting section 30 at the junction between the containers is cut, the openings of each container tI9 are sealed, and the field-effect liquid crystals according to the overlapping @ are cut. A display element was obtained. According to the field-effect liquid crystal display element 0IIl method related to superposition@, multiple liquid crystal display elements can be injected with m-, and there is no need to connect each container to each other, which increases productivity. The operating characteristics and flexibility of the device are similar to those of the previous embodiment.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a method of manufacturing a conventional 0@ crystal display element.
JII2111 is a rounded schematic diagram illustrating one implementation of the field effect liquid crystal display element 0IliI manufacturing method according to the present invention,
FIG. 3 is a schematic diagram of rounding explaining another embodiment of the present invention. 1, 1', 11.11'...electrode 9...li
t's 11 units 2, 2', 12.12'... Board 19
...1lI2 container 3.13...adhesive 3
0... Cutting part 6, I, 15.16... One hole part 7.17... Liquid crystal 10... Channel agent layer person Patent attorney Noriyuki Chika (1 person) Figure 1 11

Claims (1)

[Claims] In an OR manufacturing method for a field effect liquid crystal display element, in which liquid crystal is injected into a container formed from a substrate having two electrodes, 2
At least four substrates having electrodes are formed, and at least one first container is injected with ink. A ninth hole is formed to inject the liquid crystal into the SS of 9112, and a ninth hole is formed to drain the liquid crystal, and - to connect the power distribution 1 and the 20th container, A flow path is interposed between the first container 〇 and the outflow opening of the container of Iki Rattan 2, and while applying a DC voltage between the electrodes of the second container, - the power distribution 2.・Inject the liquid crystal from the injection hole in the container,
-Note No. 101! The liquid crystal fills the container, and after 9 days, the flow path between #Ki III and 1112 containers! ] A method for manufacturing a field effect liquid crystal display element, which comprises separating the first container and sealing a hole portion of the first container to prevent mold from forming.