JPH0240630A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent an electrode terminal from corroding electrically by extending and forming part of a seal material interposed between the peripheral parts of 1st and 2nd substrates to the section between the segment terminal and common terminal at one side end of the 2nd substrate. CONSTITUTION:The top surface of a lower glass substrate 3 where segment electrodes and electrode terminals 5 and 6 are formed is coated with the seal material 4 made of epoxy resin, etc. In such a coating process, part of the seal material 4 is extended to the section between the segment terminal 5 and common terminal 6 at one side end of the lower glass substrate 3. This seal material extended part 4a is cured in a pressure applying and heating process after an upper glass substrate 1 is superposed as well as the seal material 4. Thus, the seal material extended part 4a prevents the segment terminal 5 and common terminal 6 from short-circuiting and then good results as to the manufacture cost and yield are obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display element (hereinafter referred to as LCD).
In particular, it relates to measures to prevent electrolytic corrosion of the electrode terminals.

[Conventional technology]

Fig. 3.4 is for explaining a conventional general LCD, Fig. 3 is a schematic plan view, and Fig. 4 is a sectional view of the main part along line A-A.

In these figures, the lower surface of the upper glass substrate 1 is coated with ITO.
A common electrode 2 made of a film or the like is formed on the upper surface of the lower glass substrate 3, and segment electrodes (not shown) made of the same ITO film or the like are formed on the upper surface of the lower glass substrate 3.
．． A sealing material 4 made of epoxy resin or the like is interposed on the peripheral edge of the opposing surface of the glass substrates 3, and both glass substrates 1 and 3 are joined by this sealing material 4. Further, a liquid crystal (not shown) is sealed in a space surrounded by a sealing material 4 between both glass substrates 1.3.

Further, on one side end of the lower glass substrate 3, a large number of segment terminals 5 extending from the segment electrodes are formed at a predetermined pitch, and a common terminal 6 is formed which is electrically connected to the common electrode 2. There is. Here, the common terminal 6 is electrically connected to the common electrode 2 extending outside the sealing material 4 on the lower surface of the upper glass substrate 1 via a transfer 7 made of silver paste or the like.

As is well known, the LCD having the above configuration connects the segment terminals 5 and common terminals 6 to a driving power source, and applies a voltage between the segment electrodes and common electrodes 2 facing each other via the liquid crystal. A desired pattern such as the following can be displayed.

By the way, when such an LCD is placed under humid conditions, moisture tends to condense on one side of the lower glass substrate 3 where the segment terminals 5 and common terminals 6 are exposed, and water droplets form as shown in FIG. There was a risk that the segment terminal 5 and the common terminal 6 would be short-circuited via the terminal 10. When electricity is applied to the LCD in this state, the water droplets 10 become an electrolyte and an electrochemical reaction occurs, which causes electrolytic corrosion (stray current corrosion) in which indium and tin in the ITO film become ions and dissolve. occurs, segment terminal 5 and common terminal 6
There was a risk that this could lead to a serious accident such as wire breakage.

Conventionally, in order to prevent such electrolytic corrosion, the surfaces of segment terminals and common terminals are coated with a conductive film such as carbon or an insulating film such as polyimide to prevent these electrode terminals from coming into contact with water droplets. is proposed. Note that this type of LCD is, for example, disclosed in Japanese Patent Application Laid-open No. 58
Examples include those described in Japanese Patent Application Laid-Open No. 58-83817.

[Problem to be solved by the invention]

However, if a conductive film or an insulating film is formed on the surface of the electrode terminal as a measure to prevent electrolytic corrosion, the cost of materials and the number of steps will increase, which will inevitably increase the cost of the LCD, and will also reduce the manufacturing yield.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an LCD in which electrolytic corrosion of electrode terminals can be prevented without adversely affecting manufacturing costs or yield.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a first substrate on which a common electrode is formed, a second substrate on which segment electrodes are formed, and a sealing material interposed on the peripheral edges of the opposing surfaces of these side substrates. , and a liquid crystal sealed in a space surrounded by the sealing material, and in which a segment terminal and a common terminal are exposed at one side end of the second substrate, a part of the sealing material is attached to the second substrate. It is configured to extend between the segment terminal and the common terminal at one end of the second board.

[Effect]

According to the above means, since the extending portion of the sealing material acts as a barrier, there is no risk of short-circuiting between the segment terminal and the common terminal through water droplets, thereby preventing electrolytic corrosion and improving the durability of the LCD. Furthermore, even if the sealing material is provided with an extension, the number of steps does not increase and the yield is not affected.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic plan view of an LCD according to an embodiment of the present invention;
FIG. 2 is a sectional view of the main part along the line A-A, and the third
．． Portions corresponding to those in FIG. 4 are given the same reference numerals, and redundant explanations will be omitted as appropriate.

As shown in FIGS. 1 and 2, in this embodiment, a part of the sealing material 4 interposed on the peripheral edges of the opposing surfaces of the upper and lower glass substrates 1.3 is extended to one side edge of the lower glass substrate 3. This is different from the conventional general LCD described above in that the sealing material extension portion 4a prevents a short circuit between the segment terminal 5 and the common terminal 6. That is, when manufacturing an LCD, segment electrodes (not shown) and electrode terminals 5.6
A sealing material 4 made of epoxy resin or the like is applied in a band shape to the upper surface of the lower glass substrate 3 on which the 3-dimensional structure is formed. During this coating process, a part of the sealing material 4 is applied to the segment terminal 5 on one side of the lower glass substrate 3. It extends between the common terminal 6 and the common terminal 6. Like the sealing material 4, this sealing material extension portion 4a is hardened during the pressure and heating process after the upper glass substrates 1 are stacked together.

Now, in the above-mentioned embodiment having such a sealing material extension part 4a, even if water vapor condenses under a humid condition, the segment terminal 5 and the common terminal 6 are short-circuited through water droplets. Since there is no risk, accidents such as water droplets becoming an electrolytic solution and causing electrolytic corrosion when electricity is applied are prevented, and the durability of the LCD is improved. Further, the sealing material extension portion 4a can be easily formed using the same material and the same process as the sealing material 4. In other words, it is only necessary to partially change the application shape of the sealing material 4. Cost increases can be suppressed, and there is no need to worry about adverse effects on manufacturing yield.

〔Effect of the invention〕

As explained above, according to the present invention, since a part of the sealing material extends between the segment terminal and the common terminal, there is no risk that the picture electrode terminal will be short-circuited through water droplets.
This has the effect of preventing electrolytic corrosion of the electrode terminals and improving the durability of the LCD.Furthermore, the above-mentioned sealing material extension can be easily formed by only partially changing the application shape of the sealing material. There is no need to worry about increased costs or decreased yield during manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an LCD according to an embodiment of the present invention;
FIG. 2 is a sectional view of a main part thereof, FIG. 3 is a schematic plan view of a conventional general LCD, and FIG. 4 is a sectional view of a main part thereof. 1... Upper glass substrate (first substrate); 2...
...Common electrode, 3...Lower glass substrate (second
board), 4...Sealing material, 4a...
Seal material extension portion, 5...Segment terminal, 6.
...Common terminal, 7...Transfer (
connection means). Figure 1 Figure 3 Figure 2 Figure 4 Procedural amendment (method) % formula % Indication of the case Patent application No. 1986-190659 Name of the invention Person who makes corrections to liquid crystal display elements Relationship to the case

Claims (1)

[Claims] A first substrate on which a common electrode is formed, a second substrate on which segment electrodes are formed, a sealing material interposed on the periphery of the opposing surfaces of these two substrates, and a space enclosed by this sealing material is sealed. A liquid crystal display element comprising: a liquid crystal display device, and a segment terminal extending from the segment electrode and a common terminal electrically connected to the common electrode via a connecting means are exposed at one side end of the second substrate. A liquid crystal display element, wherein a part of the sealing material is formed to extend between the segment terminal and the common terminal on one side of the second substrate.