JPS5879219A - Orienting treatment for electrode plate for liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent insulation breakdown owing to static electricity and to improve yield by rubbing the respective electrodes of a liquid crystal display element while holding these electrodes short-circuited. CONSTITUTION:In order to maintain the respective patterns of the electrodes 1, 2 of a liquid crystal display element to same potentials, lead terminals 3, 4 unnecessary for orientation treatment are masked with a stainless steel plate 5 of 0.2mm. thickness and while the electrodes 1, 2 are held short-circuited with each other, the electrodes are rubbed and oriented. Thus insulation breakdown owing to static electricity is prevented and yield is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for aligning an electrode plate for a liquid crystal display element.

A liquid crystal display element is formed by combining a front electrode plate and a back electrode plate which have been subjected to alignment treatment with a sealing material at a predetermined gap, and then injecting liquid crystal into the gap and sealing it.

Liquid crystal display elements have come to be used for a variety of purposes because the electrode patterns can be made arbitrarily.Figure 1 shows an example of a pattern used for a car instrument panel, and is used for analog tachometers (1) and It consists of a digital speedometer (2).

As the number of display electrodes increases in this way, the pattern becomes finer and at the same time the number of lead terminals increases, making it impossible to take out one end of the electrode plate, and a design in which the electrodes are taken out from the two ends = (3) + (4) in the frame of Figure 1 was adopted. be done.

In the case of orientation treatment using the t-rubbing method for an electrode plate with such a design, when the rubbing direction is in the direction of the arrow, that is, when rubbing from the lead terminal (3) side to the lead terminal (4) side, the 7'C (3 ) Static electricity is generated by rubbing on the electrode with the terminal on the side, and the electrode (a) and electrode (b) are temporarily disconnected.
(FIG. 2), a potential difference of several thousand volts occurred, causing a problem of dielectric breakdown of the alignment film.

The present invention was made in view of the above problems, and its entire purpose is to prevent dielectric breakdown due to static electricity during rubbing and to improve yield.

The present invention will be explained below based on illustrated embodiments.

FIG. 3 shows an embodiment of the present invention. In order to maintain the same potential between each pattern of electrodes (1) and (2), lead terminals (") y (4) t O,, which do not require alignment treatment, are formed. Mask with a stainless steel mask (5) of 2wag thickness, short-circuit between each electrode, and perform alignment treatment by rubbing in good condition.In this case, the area under the stainless steel mask (5) is not aligned, but it should be placed outside the viewing range. There is no problem if you design the mask accordingly. In this example, a stainless steel mask was used, but since it is sufficient to short-circuit all electrodes with a conductive material, it is also possible to use conductive rubber, conductive sponge, metal foil, etc. good.

In addition, this dielectric breakdown occurs between very close wiring lines, so it is not necessarily necessary in areas with wide wiring spacing, so it is possible to eliminate all short-circuited areas, but it is usually not done because it is time-consuming. It would be better if they were all short-circuited.

FIG. 4 shows an electrode pattern (1) according to another embodiment.

゛(2) and its lead terminal (a) +' (4) '
At the same time as forming the e-shadow, if all short-circuit parts (6) between each electrode are formed and orientation treatment is performed by rubbing in this state, the potential between each electrode will be maintained at the same level, thereby preventing dielectric breakdown on the orientation treatment surface. is prevented.

Then, by cutting along the dotted lines, a predetermined oriented electrode plate can be obtained. Note that the cutting process may be performed immediately after the rubbing process as in the example, but since the alignment treatment surface may be damaged during cutting, the cutting process may be performed after the front electrode plate and the back electrode plate are combined, or after the liquid crystal It is desirable to completely inject and seal the device and then cut and separate it.

By rubbing with the electrodes completely short-circuited in this manner, the dielectric breakdown phenomenon caused by static electricity, which had previously occurred in many cases, was eliminated.

The above method for preventing the dielectric breakdown phenomenon that occurs during rubbing has been explained based on FIG. 31 and FIG. 4, but the method shown in FIG. is particularly desirable.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of an electrode pattern, FIG. 2 is a partially enlarged plan view thereof, and FIGS. 3 and 4 are plan views of an electrode plate according to an embodiment of the present invention. 1.2... Electrode pattern, 3.4... Lead terminal. 5... Conductive mask, 6... Electrode short circuit part 98

Claims (1)

[Claims] 1. A liquid crystal display element characterized in that when aligning an electrode plate for a liquid crystal display element by a rubbing method, rubbing is performed with each electrode short-circuited in order to prevent dielectric breakdown due to static electricity. Orientation treatment method for electrode plates. 2. A method for aligning an electrode plate for a liquid crystal display element according to claim 1, characterized in that a short circuit between each electrode is provided at a cut portion of the electrode plate at the same time as the electrode pattern is formed. 3. The method for aligning an electrode plate for a liquid crystal display element according to claim 1, characterized in that each electrode is short-circuited with a mask made of a conductive material and then rubbed.