JPS58114084A - Side electrode formation of display cell - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming side electrodes for transfer or power supply connection on the side surfaces of display cells.

Hitherto, 6 display cells having side electrodes on the side surfaces have been known; for example, in the case of a liquid crystal display cell, FIGS.
It is configured as shown in the figure.

That is, in this liquid crystal display cell, electrodes 2.2 and electrode leads 3 are formed on a pair of electrode substrates 1.1 made of glass or the like, and these pair of electrode substrates 1.1 are bonded and polymerized via a sealing material 4. A liquid crystal material 5 is sealed inside the electrode substrate 11, and a side electrode 600 is formed by screen-printing a conductive paste on 11% of the side surface of the electrode substrate 11. , and this side electrode 6°0. This structure is configured to electrically connect the electrode lead 3 and the terminal electrode 7 for power supply connection formed on the lower surface of the electrode substrate 1.

However, in the above-mentioned liquid crystal display cell,
Since each electrode substrate 1, l is cut into a predetermined size with a dicing saw or the like, the cut surface, that is, the side surface 1a
, la are finished to be considerably rougher than the other upper and lower surfaces. For this reason, the conductive paste is applied to the side surfaces 1a, la.
When screen printing and curing the conductive paste on the side surfaces 1&, 11L, the conductive paste did not adhere sufficiently to the side surfaces 1&, 11L, and as shown in FIG. ．． ．． A gap is created between the left side surfaces 1a and 1a, and the side surface electrode 6°1. The disadvantages were that the adhesiveness was poor, and the moisture resistance and moldability were also deteriorated.

Also, the above side charge is $46. ．． ．． Since the conductive paste is simply screen printed and then cured, the amount of conductive paste inserted between the pair of T-electrode substrates 1.1 is small, and therefore the side electrodes 618. There is also a drawback that the contact between the electrode lead 3 and the electrode lead 3 may not be established reliably.

The present invention has been made in consideration of the above points, and its purpose is to provide (m: a surface electrode that can be reliably fixed to the position of a display cell).

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. The display cell shown in FIG. 3 is almost the same type of liquid crystal display cell as the liquid crystal display cell shown in FIG. 1 and FIG. The same parts as the display cells are given the same reference numerals, and the explanation thereof will be omitted.

First, the electrode substrate 1.1 is cut into a predetermined size using a dicing saw. The side surfaces 1a and 1m of the electrode substrate 1.1 cut in this way have finely uneven surfaces. Thereafter, the electrode substrate 1.1 is formed with the electrode leads 3, the electrode substrates 1.1 are arranged facing each other, and the sealing material 4 is sandwiched between them. Enclose 5. Then, the side surfaces 1a, la of the electrode substrate 1.1 are
conductive paste made of epoxy resin, etc.) 10°.

are screen printed in correspondence with the electrode leads 3 (not shown, but a plurality of them are formed in an array).

After this, the conductive base X) 10. .

, the conductive paste) 10. is cured using a pressing jig 11 as shown in FIG. ,.

is pressed against the above-mentioned side surfaces 1a and 1a to apply pressure and heat. In this case, at least the pressing surface of the pressing jig 11 is made of Teflon or the like with very low surface energy, and the pressing surface is also coated with the conductive paste (10). , , corresponding concave portion 12°1. is formed. Further, a heating device (not shown) is built into the pressing jig 11, and this heating device heats the pressing surface to a predetermined temperature (temperature at which the resin is cured, for example, /!).
Therefore, the conductive paste io, ,
When pressurizing , at the same time, the conductive paste) 1
0. , are heated and thereby harden. in this case,
(Above conductive paste)10. ,.

The above-mentioned pressure treatment J! Pressure surface of 11 (especially the fourth part 12°0.)
10. If the conductive paste adheres to the surface, apply the conductive paste to the pressing surface. , , can be sprayed with a powdery substance to prevent adhesion.

In this way conductive paste) 10. , , are cured to form side electrodes, as shown in FIG. 4, the side electrodes 13 are in close contact with the side surfaces 1a and 1m without any gaps. As a result, the side electrode 13. , , firmly adheres without peeling off, and moisture resistance and wettability are improved.

Further, since a part of the side electrode 13 is press-fitted between the electrode substrates 1.1, this press-fitted part comes into pressure contact with the electrode lead 3, and as a result, the side electrode 1301. The conduction between the electrode lead 3 and the electrode lead 3 is ensured, and the reliability of conduction is greatly improved. Furthermore, since the lower portions of the side electrodes 1.3;, . Furthermore, as described above, the side electrode 13. ,.

are tightly adhered to the side surfaces 1&, 1a of the electrode substrate 1.1, so that the side electrodes 13. ．． ．． It can itself be used as a terminal electrode.

By the way, in the manufacturing method described above, conductive paste) 10.
Although epoxy resin is used in the present invention, the present invention is not limited to epoxy I resin in any way, and other organic or inorganic substances may be used. For example, a mixture of glass and metal (the metal is silver, aluminum, carbon, etc.) may be used as the inorganic substance. In this case, the heating temperature should be set to about tloo'c-
s.

All you have to do is pressurize it to 00C.

Further, in the above-mentioned manufacturing method, a heating device is built into the pressing jig 11 to heat the pressing jig 11, but the present invention does not necessarily require a heating device to be provided inside the pressing jig.
There is no need for Z, for example, the pressing jig and the above liquid crystal display cell are
They may be placed in two heating chambers to pressurize these bodies while heating them. θヱ(Furthermore, in the above-mentioned manufacturing method, a liquid crystal display cell in which the pair of electrode substrates 1.1 have the same size has been described, but the present invention is not limited to this. This liquid crystal display cell can also be applied to a liquid crystal display cell having a pair of upper and lower electrode substrates 20.
．． One of the electrode substrates 21 is formed to be about half the size and placed facing each other Dd, and side electrodes 422.21 made of conductive paste are formed on the side surfaces 20m and 21a of these electrode substrates 20 and 21. ．． ．． was formed. Such a liquid crystal display cell can be used, for example, in a wristwatch, with approximately half of the cell having a digital function and the other half having a pointer-type clock function. Note that 23 in the figure is a through hole through which the pointer shaft of the pointer type timepiece function is inserted.

It goes without saying that the present invention is not limited to high display cells, but can also be applied to other display cells, such as, for example, electronic 0-mic display cells.

As explained above, according to the method for forming a one-sided electrode on a stick according to the present invention, after applying a conductive paste to the side surface of a display cell, when the conductive paste is hardened, the conductive paste is pressurized to form a side surface of the display cell. 'Because it forms an IIL pole,
The adhesion of the side electrode can be improved, and the side electrode can be firmly fixed to the side surface without peeling off excessively, and the moisture resistance and wettability can also be improved. Moreover, since the side electrode is firmly fixed to the side surface, the side electrode itself can be used as an electrode terminal, and by pressurizing the upper conductive paste, a part of it can be used as an electrode lead of the display cell, for example. Since they are in pressure contact with each other, the conduction between them can be ensured.

[Brief explanation of drawings]

Figures 1 and 2 show conventional liquid crystal display cells.
The figure is a perspective view, FIG. 2 is a cross-sectional view of a main part thereof, FIG. 3 is a perspective view for explaining the side electrode forming method according to the present invention, and FIG. 4 is an adhesion of the side electrode formed by the above method. Figure 15, which shows the state, is a perspective view showing another display cell. 1.20.21. ,,electrode substrate, 1m, 20m. 21m, 1 side, 10. ,, conductive paste, 13.2
2,,,@plane electrode. Patent applicant Casio Computer Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 3

Claims (1)

[Claims] On the side of the display cell, which is made by bonding and polymerizing a pair of electrode substrates,
The patent discloses that a conductive paste is applied to correspond to the electrode leads formed on the inner surface of the electrode substrate, and the conductive paste is pressed against the side surface of the display cell and hardened to form a side electrode made of the conductive paste. A method for forming side electrodes of a display cell.