JPH02114237A - Method for sealing electrochromic display - Google Patents

Abstract

PURPOSE:To prevent a decline in the adhesive force of a secondary sealing member after hardening by covering exposed sections of a primary sealing member hardened after a primary sealing process and a space around an injecting port with the secondary sealing member and, at the same time, hardening the secondary sealing member. CONSTITUTION:After an electrolytic substance 11 is injected into the space in a cell section 1 from the injecting port 10C of the section 1, the port 10C is sealed by a primary sealing process which seals the port 10C by hardening a primary sealing member 13a after filling up the port 10C with the member 13a. Then the port 10C of the cell section is double-sealed by a secondary sealing method which seals the port by hardening a secondary sealing member 13b after the exposed section of the member 13a and a spacer exposed section 120 around the port 10C are covered with the member 13b. Therefore, the secondary sealing member 13b does not receive any influence from the electrolytic substance 11 before getting hardened and does not decline in the adhesive force, because the member 13b is not brought into contact with the substance 11 by the hardened primary sealing member 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of sealing an electrochromic display. Specifically, the present invention relates to a sealing method that prevents an electrolyte sealed in a cell portion of an electrochromic display from leaking out from a sealed portion.

[Prior Art] As a conventional method for sealing an electrochromic display, for example, as shown in FIG. 9, which shows the whole in perspective, and FIG. 10, which shows an enlarged view of the primary part of FIG. Electrolyte 11 is introduced from the inlet 100C into the internal gap 100e.
0 is injected, a sealing process is used in which the injection port 100C is filled with an adhesive 130, and the adhesive 130 is cured and sealed.

[Problems to be Solved by the Invention] According to the conventional electrochromic display sealing method described above, the adhesive 130 sealing the injection port 100C of the cell portion 1a fills the gap 100C of the cell portion 1a when uncured.
It was found that the adhesive force was reduced after curing due to contact with the electrolytic solution 110 filling the area. This phenomenon can be explained, for example, by using an elect≧ ivy display sealed with the adhesive 130 after the injected Cl 100 C in the cell part 1a is cured at a temperature of 65° C. and a humidity of 95° C. as a test piece.
% condition for 100 hours, the adhesive 130 after hardening peels off at the sealed portion of the wall 101C of the injection port 100c, which can be confirmed by leakage.

The cause of this is that the electrolyte 110 that has come into contact with the uncured adhesive 130 filled in the injection port 100c
It is determined that the adhesion force at the sealing portion is reduced because it penetrates into the 30, diffuses, and swells.

The present invention was made to solve the above problems, and an object of the present invention is to provide a sealing method for an electrochromic display that prevents a decrease in adhesive strength after curing.

[Means for Solving the Problems] The electrochromic display sealing method of the present invention includes a pair of substrates facing each other in parallel, at least one of which is transparent, and an electrolyte applied to the periphery of the opposing side surfaces of the substrates. An electrolyte body is introduced into the gap of the cell part from the injection port of the cell part, which is formed of a spacer that is arranged in a sandwich shape except for the part that becomes the injection port and forms a gap in which the electrolyte body can be enclosed in the substrate r~. After injection, a primary sealing step of filling and hardening the primary sealing member into the injection port; and after the primary sealing step, at least the hardened exposed portion of the sealing member and the spacer around the injection port. This method is characterized by comprising a secondary sealing step of covering the exposed portion with a secondary sealing member and curing the secondary sealing member.

The electrochromic display sealing method of the present invention includes a first sealing step and a second sealing step.

In the next sealing step, the electrolyte is injected into the gap of the cell part from the injection port of the cell part, and then the primary sealing member is filled into the injection port and hardened. This cell part is arranged in a sandwich-like manner between a pair of parallel substrates, at least one of which is transparent, and a portion on the periphery of the mutually opposing inner surfaces of the substrates, excluding a portion that serves as an injection port for the electrolyte body. It consists of a base 4f that forms a gap in which an electrolyte body can be enclosed. - The number stopper member is the electrolyte body [IIi!] when it is not cured. An aqueous solution such as an aqueous solution of 1 acid or an aqueous solution of hydrochloric acid, or a non-aqueous electrolyte formed by dissolving lithium te[·rafluoroborate (L i BF4 ) or lithium barchlorate (L i Cl0m >) in acetonitrile or propylene carbonate as a solvent; Any material can be used as long as it can be cured even when it comes into contact with the electrolyte body and is not attacked by the electrolyte body after curing. For example, epoxy adhesives, silicone resins, etc. can be used.

In the next sealing step, after the primary sealing step, at least the exposed portion of the hardened primary sealing member and the exposed portion of the spacer around the injection port are covered with the secondary sealing member, and the secondary sealing member is cured. The secondary sealing member preferably uses the same type of adhesive as the above-mentioned sealing member, but is not limited to this, and it is possible to use a different type of adhesive from the sealing member. can. After being applied from the top of the primary sealing member, it hardens to cover the exposed portions of the primary sealing member and the spacer, thereby providing a seal, and is not corroded by the electrolyte body after curing. Good to have.

[Operation] In the next sealing step, after the electrolyte is injected into the gap of the cell part from the injection port of the cell part prepared in advance, the primary sealing member is filled into the injection port. , left for a certain period of time; δ, or cured using means such as a drying device or a heating device.

Subsequently, in the secondary sealing step, the exposed portion of the primary sealing member filled into the injection port of the cell portion and hardened in the primary sealing step and the exposed portion of the spacer around the injection port were covered with a secondary sealing member. Afterwards, this secondary sealing member is cured by the same means as the primary sealing step.

[Example] A method for sealing an electrochromic display according to this example will be explained based on FIGS. 1 to 8.

The sealing method of this embodiment consists of a primary sealing process and a secondary sealing process.

Note that, prior to implementing this sealing method, a cell portion 1 as shown in FIGS. 1, 2, and 7 is prepared.

This cell part 1 includes a pair of substrates 10a facing each other in parallel,
10b and a spacer 12.

The substrates 10a and 10b are electrochromic substrates (not shown).
It consists of a pair of glass plates on which a molecular thin film and electrodes are arranged.

The spacer 12 is arranged in a sandwich-like manner at the peripheral edge of the opposing inner surfaces of the substrates 10a, 10b, excluding the portion that will become the injection port 10c for the electrolytic solution 11.
A gap 10e in which the electrolytic solution 11 can be sealed is formed in the gap 10e. This spacer 12a is made by cutting a sheet of hot melt adhesive ("Dumilan Trademark", manufactured by Takeda Pharmaceutical Co., Ltd.) with a thickness of 0.2 to 3 mm, and
Connect the primary inlet 10C (approximately 5 mm width) between the
It has a frame shape surrounded by a band-like area with a width of 1 mm (mm width). This spacer 12a is placed at a fixed position on one substrate 10a.

In this state, both substrates 10a and 10b are pasted together with the spacer 12 in between, and a constant pressure (1 kg load) is applied from the outside on both substrates 10a and 10b, and the pressure is maintained at a temperature of 100° C. for about 10 minutes. As a result, a cell portion 1 having a gap 10e formed by a pair of substrates 10a, 10b and a spacer 12 as shown in FIGS. 7 and 8 is formed.

An electrolytic solution 11 formed by dissolving lithium tetrafluoroborate (LiBF4) using propylene carbonate as a solvent is injected into the gap 10e of the cell part 1 through the injection port 10c, and the electrolyte 11 is injected into the gap 10e.
Filled with 1.

After this, the primary seal culm is ripened. The cell part 1 filled with electrolyte is connected to the substrate 10a110b as shown in FIG.
Pressure is applied to each other in the directions of the arrows X1 and X2 from the outer surfaces of the two. Then, the upper liquid level of the electrolytic solution 11 in the gap 10e rises from the 8th position to the 8th position. In this state, a first adhesive (epoxy adhesive) 13a serving as an uncured primary sealing member is applied to the upper part of the injection port 10c. Then, the pressurized state (load in the directions of arrows X1 and X2) on both substrates 10a and iob of the cell section 1 is released. As a result, electrolyte 1 at position A
As the upper liquid level of No. 1 returns to position 8, the first adhesive 13a applied to the upper part of the injection port 10c is drawn into and filled into the injection port 10c as shown in FIGS. 3 and 4. Ru. Then, the excess first adhesive 13a remaining on the outside of the i1st person 10c is removed. The first adhesive 13 filled in the injection port IC)C of the cell portion 1a as described above.
A was left at room temperature for one day to dry and harden. This terminates the primary sea, the Rue culm.

Subsequent secondary seal■In the culm, the second sealing member is used as a secondary sealing member.
Adhesive (epoxy adhesive) 13b SrfI covers the exposed portion 130a of the first II adhesive 13a after being cured within the injection port 10c and the spacer exposed portion 120 around the injection port 10C. (See Figures 5 and 6). Thereafter, the second adhesive 13b was dried and hardened under the same conditions as in the primary sealing step to form a finished product.

(Experiment and Results) An electrochromic display in which the injection port 10c of the hill portion 1 was double-sealed by the above-mentioned primary sealing process and the secondary sealing culm was used as a test part to conduct peeling and liquid leakage experiments at the sealed portion.

This experiment was conducted under the conditions of a temperature of 65°C and a humidity of 95%.
Leave it alone for oo hours. As a result, none of the test parts had any defects that would cause liquid leakage from the seals. Furthermore, no bubbles remained inside.

[Comparative Example] In this comparative example, an electrochromic display in which the injection port 10c of the cell part 1 was sealed only by the primary sealing process of the above example was used as a test part, and the test was performed under the same conditions as in the above example. Then, peeling and liquid leakage experiments were conducted. As a result, 10 hours tested parts 10
Out of 0, 83 had adhesive peeling and liquid leakage, and similar problems occurred in the remaining 17 after 150 hours. In addition, bubbles were observed to be generated inside 15 of the samples.

[Effects of the Invention] The electrochromic display sealing method of the present invention includes injecting the electrolyte into the gap in the cell part from the injection port in the hill part, and then filling the injection port in the cell part with a couple of stoppers. a primary sealing step of curing and sealing; covering the exposed portion of the negative number sealing member and the exposed portion of the spacer around the injection port with a secondary sealing member; and curing the secondary sealing member; The second sealing process is used to double-seal the injection 1] of the cell part.

Accordingly, the secondary sealing member is held in a state not in contact with the electrolyte body when uncured by the primary sealing member after curing, is not affected by the electrolyte body, and does not reduce adhesive strength. . Therefore, the primary sealing member that partially contacts the electrolyte body sealed in the cell portion is sufficiently reinforced by the secondary sealing member having strong adhesive force. In addition, the exposed portion of the primary sealing member and the exposed portion of the spacer around the injection port are covered and sealed by this secondary sealing member, so that the electrolyte body sealed in the gap in the cell portion is Problems such as leakage to the outside can be resolved.

[Brief Description of the Drawings] Figures 1 to 6 are explanatory diagrams of a method for sealing an electrochromic display according to an embodiment of the present invention.
5 and 5 are front views showing the inside with one of the pair of substrates forming the cell portion removed, and also showing the primary sealing process and the secondary sealing process. Figures 2, 4 and 6 are a cross-sectional view taken along the knee line 1 and 2, respectively, showing a pair of substrates integrated at the positions shown in Figures 1, 3 and 5, respectively. -■ Line cross-sectional view, III-I
[[This is a cross-sectional view taken along the line. FIG. 7 is a perspective view of a cell section used in an embodiment of the present invention. FIG. 8 is an enlarged partial cross-sectional perspective view showing the sealed state of the injection port of the cell section in FIG. 7. FIG. FIG. 9 is a perspective view of a cell section used in a conventional electrochromic display sealing method. FIG. 10 is an enlarged partial cross-sectional perspective view showing the sealed state of the injection port of the cell section in FIG. 9. FIG. 1...Cell part 10a110b...Substrate 10
c... Inlet 10e... Gap 11... Electrolyte 12... Spacer 120... Spacer exposed portion 1
3a...First adhesive 130a...Exposed portion 13b of first adhesive...Second adhesive patent applicant Toyota Automotive Co., Ltd.

Claims (1)

[Claims] (1) A pair of substrates facing each other in parallel, at least one of which is transparent, and an electrolyte placed between the substrates, which are arranged in a sandwich-like manner except for the portion that serves as an electrolyte injection port on the peripheral edge of the mutually opposing inner surfaces of the substrates. A primary sealing step in which the electrolyte body is injected into the gap of the cell part from the injection port of the cell part, which is formed by a spacer that forms a gap in which the body can be enclosed, and then the primary sealing member is filled into the injection port and hardened. After the primary sealing step, at least the exposed portion of the hardened primary sealing member and the exposed portion of the spacer around the injection port are covered with a secondary sealing member, and the secondary sealing member is hardened. A method for sealing an electrochromic display, comprising: a secondary sealing step;