JPH0727138B2 - Liquid crystal display element manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly to a method for preventing static electricity from being generated on a glass substrate during a manufacturing process.

[Conventional technology]

Conventionally, in order to manufacture a liquid crystal display device, first, as shown in FIG. 5, a transparent conductive film 3 is vapor-deposited on a glass substrate 4 placed on a metal machine bed 6 and etched into an arbitrary pattern. After that, a polymer alignment film 2 for aligning liquid crystal molecules is applied. Next, the polymer alignment film 2 is rubbed with a chemical fiber such as polyester or nylon in order to arrange liquid crystal molecules in a certain direction. After rubbing, the outer peripheral sealing material is printed on the glass substrate 4, and the glass substrate on which the transparent conductive film 3 and the polymer alignment film 2 are formed is superposed on the glass substrate 4 shown in FIG. Glue the glass substrate.
After that, liquid crystal is injected into the space surrounded by both glass substrates.

[Problems to be solved by the invention]

In the above conventional process, when the polymer alignment film 2 is rubbed, a negative charge is generated in the glass substrate 4 which is an insulator. Therefore, the glass substrate 4 is taken out from the machine bed 6 in the next process. Sometimes due to the electrostatic induction effect, it is -10 KV
Discharge is performed from the glass substrate 4 that is charged to the bed 6 of the machine and the hand of the operator. Further, at the time of this discharge, as shown in FIG. 6, a creeping discharge is generated even at a position where the segment electrodes 3A and 3B which are the transparent conductive film 3 are closest to each other, and the polymer alignment film 2 is damaged by this discharge. Therefore, there is a possibility that liquid crystal alignment defects may occur.

The present invention has been made to prevent static electricity from being generated in the device during the manufacturing process of the liquid crystal display device as described above.

[Means for solving problems]

Therefore, in the present invention, a transparent conductive film and an alignment film are provided on two glass substrates, the alignment film is rubbed, and then liquid crystal is injected into a space surrounded by the two glass substrates. In the method of manufacturing a liquid crystal display element, a technical means of forming a conductive member on the outer periphery of the glass substrate is adopted before the rubbing treatment.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

In this embodiment, as shown in FIGS. 1 and 2, an outer peripheral conductive film is formed on the outer periphery of the glass substrate 4 before the rubbing process.
30 is formed. Specifically, it is preferable to simultaneously form the transparent conductive film 3 on the photo glass substrate 4 by vapor deposition. In other words, if the pattern of the transparent conductive film 3 and the pattern of the outer peripheral conductive film 30 are formed on the photomask, respectively, the outer peripheral conductive film can be vapor-deposited at the same time.
30 vapor depositions are made. Therefore, the number of steps is not increased as compared with the conventional manufacturing steps, and it is extremely practical.

Incidentally, in FIG. 1, the same reference numerals as those in FIGS.
Since the same components are shown, their description is omitted.

After the outer peripheral conductive film 30 is deposited, the polymer alignment film 2 is applied and the rubbing process is performed, and then the glass substrate 4 is removed from the machine bed as in the conventional case.

At this time, electric discharge is generated between the glass substrate 4 and the machine bed. However, since the outer peripheral conductive film 30 is provided on the outer periphery of the glass substrate 4, the electric discharge is generated near the mechanical bed 6. It is possible to reliably prevent the occurrence of discharge in the portion of the transparent conductive film 3 and the occurrence of discharge in the portion of the transparent conductive film 3, and to prevent the polymer alignment film 2 in the display portion from being damaged by the discharge.

Next, after the rubbing process is completed and dust and the like are removed, as shown in FIG. 3, an outer peripheral sealant 7 made of epoxy resin or the like is formed on the glass substrate 4 by screen printing. Also in this case, since the outer peripheral conductive film 30 is provided on the outer periphery of the glass substrate 4, when the screen-printed glass substrate 4 is removed from the bed of the screen printing machine, static electricity is generated through the outer peripheral conductive film 30 of the glass substrate 4. Since it flows to the support bed 11 of the screen printing machine, damage to the polymer alignment film 2 is reliably prevented.

Next, similarly to the above, the transparent electrode 3 and the polymer alignment film 2
A glass substrate 4 on which is formed is prepared, and the two glass substrates 4 are overlapped with each other with an outer peripheral seal member 7 interposed therebetween as shown in FIG. After that, a phenylcyclohexane liquid crystal is filled in the space surrounded by both glass substrates 4 and sealed.

〔The invention's effect〕

As described above, according to the present invention, since it is possible to reliably prevent the occurrence of creeping discharge in the transparent conductive film portion, it is possible to reliably prevent the liquid crystal alignment defect due to the alignment film destruction, and improve the product quality. The reliability can be improved.

[Brief description of drawings]

1, 3, and 4 are cross-sectional views of respective manufacturing steps of the liquid crystal display element according to the present invention, and FIG. 2 is a view as seen from an arrow B in FIG.
FIG. 6 is a sectional view of a liquid crystal display element manufactured by a conventional manufacturing method.
The figure is a plan view taken along arrow A in FIG. 1 …… rubbing cloth, 2 …… polymer alignment film, 3 …… transparent conductive film, 4 …… glass substrate, 6 …… machine bed, 7 …… peripheral sealing material, 9 …… liquid crystal, 30 …… perimeter Conductive film.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Tsuji Ando, 1-1, Showa-cho, Kariya city, Aichi, Nihon Denso Co., Ltd. (56) References JP 57-62026 (JP, A) JP 60 -182413 (JP, A)

Claims (2)

[Claims] 1. A transparent conductive film and an alignment film are provided on two glass substrates, and after the alignment film is rubbed,
In a method of manufacturing a liquid crystal display device, in which a liquid crystal is injected into a space surrounded by the two glass substrates, a conductive member is separated from the transparent conductive film on the outer periphery of the glass substrate before the rubbing treatment. A method for manufacturing a liquid crystal display element, which is characterized by forming the same. 2. The liquid crystal display element according to claim 1, wherein the conductive member is a conductive film that is formed at the same time when the transparent conductive film is formed on one side of the glass substrate. Manufacturing method.