JPH01105218A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent in advance the generation of a short circuit even when each end edge part of both substrates has come into contact with each other by forming an electrode eliminating part on the end edge part of a transparent electrode which is formed on a substrate of a polymer film. CONSTITUTION:A pair of slit-like electrode eliminating parts 23b, and a pair of slit-like electrode eliminating parts 24b are formed on the upper side transparent electrode 23, and the lower side transparent electrode 24, respectively, and also, by these electrode eliminating parts 23b, 24b, the transparent electrodes 23, 24 are divided into electrode parts 23d, 24d and parting parts 23c, 24c. In such a state, in case of a pre-cut and a final cut, when a burr 33 is generated in the end edge part of substrates 21, 22, the upper side transparent electrode 23 and the lower side transparent electrode 24 come into contact with each other. However, the contact part is the parting part 23c and the electrode part 24d or the electrode part 23d and the parting part 24c, and no current flows to these parting parts 23c, 24c. In such a way, a short circuit is not generated.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a liquid crystal display device using a polymer film as a substrate, and particularly to a liquid crystal display device that prevents short circuits at the edge portions. Calamity! Conventional liquid crystal display elements of this type include those shown in FIGS. 18 to 22, for example. This liquid crystal display element has, for example, one pixel. 1st and 2nd consisting of a pair of polymer films facing each other
An upper transparent electrode 3 and a lower transparent electrode 4 are provided on substantially the entire surface of the substrates 1 and 2 (hereinafter referred to as "upper substrate 1 and lower substrate 2"), respectively.
is formed, and an alignment film 5 is also formed by alignment treatment. Then, a gap agent 6 is sprinkled between the open substrates 1.2 to ensure a gap therebetween, and both substrates 1.2 are bonded together via an annular sealant 7. A liquid crystal 8 is sealed in the sealed space defined by the sealant 7, the open substrate 1.2, etc., and this sealed range forms a display area 9 as shown by the dashed line in FIG. From this area 9, the upper substrate 1 together with the upper transparent electrode 3 is extended downward in FIG. As a result, a lower electrode extraction portion 11 is formed. In other words, in order to form the picture electrode extraction parts 10 and 11, the sizes of both the substrates 1 and 2 are made different. However, in such a conventional liquid crystal display element, before bonding the substrates 1 and 2 together to obtain the electrode lead-out portions 10 and 11, cutting called pre-cutting is performed in advance, and the final shape is further cut. In order to obtain
9.Cut it to the size shown in Figure 20. During such cutting, since both substrates 1 and 2 are made of polymer film, as shown in FIG.
, 2, and the upper transparent electrode 3 and lower transparent electrode 4 come into contact with each other, causing a short circuit. Also,
Since both substrates 1 and 2 have flexibility, they may be used in a single curved state, and in this case as well. As shown in FIG. 22, there is a risk that the surface electrodes 3 and 4 will come into contact with each other and cause a short circuit. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid crystal display element that prevents short-circuiting of transparent electrodes at the edge portions when a polymer film is used as a substrate. In order to achieve this object, the present invention includes a first substrate and a second substrate made of a polymer film, each of which has a transparent electrode formed thereon, and the two substrates are opposed to each other with an annular sealant interposed therebetween. At the same time, a liquid crystal is sealed in a sealing chamber defined by the open substrate, a sealant, etc., a display area is formed in the liquid crystal sealed range, and the substrate is further bonded to the outside of the display area. In a liquid crystal display element in which an electrode lead-out portion is formed by extending together with a transparent electrode, at least one of the transparent electrodes of the two substrates has an outer edge portion of the display area on the outer edge portion of the two substrates. The liquid crystal display element is characterized by having an electrode removal part formed to prevent short circuits due to contact. Hereinafter, this invention will be explained based on examples. 1 to 4 are diagrams showing a first embodiment of the present invention. First, to explain the structure, reference numerals 21 and 22 in FIG. As a second substrate,
These two substrates 21 and 22 are disposed facing each other on the lower substrate. The upper substrate 21 has a length Q as shown in FIG.
It is formed with a width of 0□. On the other hand, the lower substrate 22
As shown in FIG. 4, the length a is longer than the length Q□ of the upper substrate 21. The width Q is shorter than the width +22 of the upper substrate 21. On the opposing surfaces of these substrates 21 and 22, an upper transparent electrode 23 and a lower transparent electrode 24 are formed over substantially the entire surface, and alignment films 25 and 26 are formed by alignment treatment. Then, a gap agent 27 is sprayed between the two shop plates 21.22 to maintain a predetermined distance between the two shop plates 21.
2 are pasted together facing each other. The liquid crystal 29 is now sealed in the sealing chamber defined by the sealant 28, the plates 21 and 22, and the like. The range in which this liquid crystal 29 is enclosed, that is, the range shown by the dashed line in FIG. 2, is a display area 30. This area 30 indicates the size of the pixel. By making the sizes of both store boards 21 and 22 different as described above,
The upper substrate 21, together with the upper transparent electrode 23, extends downward from the lower substrate 22 in the figure to form an upper electrode extraction part 31, and the lower substrate 22, together with the lower transparent electrode 24, extends downward in the figure from the upper substrate 21. A lower electrode extraction portion 32 is formed by extending to the middle right side. Here, the upper transparent electrode 23 shown in FIG.
A pair of slit-shaped electrode removal portions 23b are formed along the width direction (extending direction of the upper electrode extraction portion 31) at both end edges 23a in the longitudinal direction, while the lower transparent electrode 24 shown in FIG. A pair of slit-shaped electrode removal portions 24b are formed along the longitudinal direction (the extending direction of the lower electrode extraction portion 32) at both end edges 24a in the width direction. This electrode removal part 2
3b and 24b are formed outside the display area 30, and the electrode removed portion 23b of the upper transparent electrode 23 and the electrode removed portion 24b of the lower transparent electrode 24 are substantially perpendicular to each other. Due to these electrode removed parts 23b and 24b, each transparent electrode 23.24 has both electrode removed parts 23b and 24b.
24b between electrode portions 23d. 24d, and dividing portions 23c and 24c outside the electrode removed portions 23b and 24b. This electrode removed portion 23b. 24b can be formed extremely easily by etching, by sliding both transparent electrodes 23 and 24 with a pointed member, by laser trimming, or the like. In order to obtain a liquid crystal display element having such a structure, first, a polymer film with transparent electrodes is cut into a workpiece size, and electrode-removed portions 23b and 24b are formed by, for example, etching. and,
After printing the alignment agent, alignment is performed by a rubbing method. After that, pre-cutting is performed, a gap agent is sprayed, a sealant is applied, the two boards are pasted together, the liquid crystal is sealed, and the final shape is cut to complete the manufacturing process. In the case of such pre-cutting or final cutting, both shop boards 21 and 22 are made of polymer film, so both shop boards 21 and 22 are made of polymer film.
As shown in FIG. 1, burrs 33 are generated on the edge portion of 1.22. Then, as in the conventional case, the upper transparent electrode 23 and the lower transparent electrode 24 come into contact. However, even with this contact,
The contact portion is, for example, the divided portion 23 of the upper transparent electrode 23.
c and the electrode portion 24d of the lower transparent electrode 24, or the electrode portion 23c of the upper transparent electrode 23 and the divided portion 24c of the lower transparent electrode 24, and since no current flows through these divided portions 23c and 24c, conventional A short circuit like this will never occur. Note that although the above description has been made regarding contact due to cutting, the same applies to contact due to curving. By the way, in the above embodiment, the electrode removal part 23b. 24b is formed in a slit shape, and dividing portions 23c, 24
Although the electrode removed portions 23b and 24b are not limited to the slit shape, they can also be formed so as to remove the divided portions 23c and 24c. Further, FIGS. 5 to 7 show a second embodiment of the present invention. This embodiment differs from the above embodiments in the configuration of slit-shaped electrode removal parts 23b and 24b. That is, the sixth
As shown in the figure, the upper transparent electrode 43 of the upper substrate 21 has
A pair of slit-shaped 111th pole removal portions 43b along the front-rear direction in the figure (extending direction of the upper electrode extraction portion 31) are provided on the edge portion 43a excluding the upper electrode extraction portion 31, and this removal portion 43b
2nd electrode removal part 43 formed in a direction perpendicular to
c is formed. Further, as shown in FIG. 7, the lower transparent electrode 44 of the lower substrate 22 has an edge portion 44a excluding the lower electrode extraction portion 32 along the longitudinal direction (the extension direction of the lower electrode extraction portion 32). A pair of slit-shaped first electrode removal parts 4
4b and the second removing portion 44b in a direction perpendicular to the removing portion 44b.
An electrode removed portion 44c is formed. Both electrode removed portions 43b and 43c of the upper transparent electrode 43 and the lower transparent electrode 4
The two electrode removed portions 44b and 44c of No. 4 refer to the side substrate 21,
22 are formed in a positional relationship such that they face each other in a state where they are pasted together. In this way, the electrode removal parts 43b, 43c, 44b, 44c
By forming this, even if the upper and lower substrates 21 and 22 are in contact with each other all around the display area 30, short circuits can be reliably prevented. The other configurations and operations are the same as those in the first embodiment, so their explanation will be omitted. Incidentally, as shown by the two-dot chain line in FIG. 5 and FIG.
A 2-pixel liquid crystal display element can be obtained by forming a slit-shaped dividing portion 43e in parallel with 3b to divide it into two. In this case, as shown by the two-dot chain line in FIG. 7, a third electrode removal part 44e is formed in the divided part 44d of the lower transparent electrode 44 at a position corresponding to the divided part 43e. In this way, short circuits can be prevented. Furthermore, FIGS. 8 to 11 are diagrams showing a third embodiment of this invention. In this embodiment, the width Q of the upper substrate 51 as shown in FIG.
It is formed to have the same length as the width Q4 of the lower substrate 52 as shown in FIG. The upper transparent electrode 53 formed on the upper substrate 51 has a first electrode removed portion 53b along the longitudinal direction in FIG.
A second electrode removed portion 53c is formed perpendicular to b. In addition, the lower transparent electrode 54 formed on the lower substrate 52 includes
Electrode removal portions 54b are formed along the longitudinal direction in FIG. 10 at both end edges 54a in the width direction. The electrode removed portion 54b and the second electrode removed portion 53c are formed at positions corresponding to each other. Then, with the side substrates 51 and 52 bonded together, the lower substrate 52 is placed 8th above the upper substrate 51.
The conductive paste A is extended to the right in the figure, and is interposed between the two divided parts 54c of the lower transparent electrode 54 and the electrode part 53d of the upper transparent electrode 53 as shown in FIG. Both are electrically connected. In this way, both divided portions 54c of the lower transparent electrode 54
can be used as the upper electrode extraction portion 55, and compared to the above embodiment, it can be expected to be smaller. Note that the conductive portion may be formed at one location, but if it is formed at two locations as in this embodiment, connection reliability can be improved. The other configurations and operations are the same as those in the first embodiment, so their explanations will be omitted. Furthermore, FIGS. 12 to 14 show the fourth embodiment of the present invention.
An example is shown. In this embodiment, the liquid crystal display element of the third embodiment has two pixels, and a divided portion 53a is formed in the center of the electrode portion 53d of the upper transparent electrode 53 in parallel with the first electrode removed portion 53b. The electrode portion 53d includes a right electrode portion 53f and a left electrode portion 5.
It is divided into 3g. The second electrode removed portion 53c on the upper side in FIG. 13 is extended from the above embodiment to a right side electrode portion 53f. Further, the second electrode removed portion 53c on the lower side in FIG. 13 is formed up to the left electrode portion 53g. Furthermore, the lower transparent electrode 54 of the lower substrate 52
, the divided portion 53 of the lower edge portion 54a in FIG.
A second electrode removed portion 54d is formed at a position corresponding to e, and the lower dividing portion 54c in the figure is divided. As shown in FIG. 12, between the left electrode part 53g of the upper transparent electrode 53 and the upper divided part 54c of the lower transparent electrode 54 in FIG. 53f and the lower divided portion 54c of the lower transparent electrode 54 in FIG.
As in FIG. 1, they are interposed and conductive. With this, the upper divided portion 5 of the lower transparent electrode 54 in FIG.
4c is the first electrode from the left side electrode part 53g of the upper transparent electrode 53.
The electrode extraction portion 61 and the lower divided portion 54c of the lower transparent electrode 54 in FIG.
This is a second electrode extraction portion 62 from f. The other configurations and operations are the same as those in the first embodiment, so their explanations will be omitted. Furthermore, FIGS. 15 to 17 are diagrams showing a fifth embodiment of the present invention. In each of the above embodiments, the substrates 21, 22, 51, 52, etc. are square, whereas the upper substrate 71 and lower substrate 72 of this embodiment are each approximately circular. This top board 7
1 and the lower substrate 72, picture electrode extraction portions 75 and 76 extend in substantially orthogonal directions, respectively. The upper transparent electrode 73 of the upper substrate 71 has a first electrode removed portion 73b formed on the edge 73a excluding the upper electrode extraction portion 75, and a first electrode removal portion 73b corresponding to the lower electrode extraction portion 76 of the lower substrate 72. A second electrode removed portion 73c is formed at the position where both removed portions 73b
, 73c are consecutive. Similarly, the edge portion 74a of the lower transparent electrode 74 of the lower substrate 72 is coated with the first. Second electrode removed portions 74b and 74c are formed. Further, the dashed dotted line in FIG. 15 indicates the display area 77. In this way, the edge portions 73a of both substrates 71, 72. Even if the entire parts 74a come into contact with each other, short circuits are prevented from occurring. The other configurations and operations are the same as those in the first embodiment, so their explanations will be omitted. As explained above, according to the present invention, by forming an electrode removal part at the edge of a transparent electrode formed on a polymer film substrate, the edges of both substrates can be brought into contact with each other. This has the practical effect of preventing the occurrence of short circuits even in the case of short circuits.

[Brief explanation of the drawing]

1 to 4 are diagrams showing a first embodiment of the liquid crystal display element of the present invention, FIG. 1 is a sectional view taken along the line ■-■ in FIG. 2, and FIG. 2 is a plan view of the liquid crystal display element. 3 is a plan view of the upper substrate, FIG. 4 is a plan view of the lower substrate, FIGS. 5 to 7 are views showing a second embodiment of the present invention, and FIG. 6 is a plan view of the upper substrate, FIG. 7 is a plan view of the lower substrate, FIGS. 8 to 11 are views showing a third embodiment of the present invention, and FIG. 8 is a liquid crystal display element. Plan view, No. 9
The figure is a plan view of the upper board, Figure 10 is a plan view of the lower board,
1 is a sectional view taken along the line XI-XI in FIG. 8, and FIGS. 12 to 14 are views showing a fourth embodiment of the present invention.
Fig. 2 is a plan view of the liquid crystal display element, Fig. 13 is a plan view of the upper substrate, Fig. 14 is a plan view of the lower substrate, and Figs. 15 to 17.
The figures show a fifth embodiment of the invention, in which Fig. 15 is a plan view of a liquid crystal display element, Fig. 16 is a plan view of an upper substrate, and Fig. 17 is a plan view of an upper substrate.
The figure is a plan view of the lower substrate, FIGS. 18 to 22 are views showing conventional liquid crystal display elements, FIG. 18 is a plan view of the liquid crystal display element, FIG. 19 is a plan view of the upper substrate, and FIG. 21 is a plan view of the lower substrate, FIG. 21 is a sectional view taken along the line XX I - XX I in FIG. 18, and FIG. 22 is a sectional view at the edge of the liquid crystal display element. 21.51.71... Upper substrate (first substrate) 22.52
, 72... lower substrate (second substrate) 23.43, 53, 7
3... Upper transparent electrode 24, 44, 54, 74.
...lower transparent electrodes 23a, 24a, 43a,
44a, 53a, 54a, 73a,
74a...edge portions 23b, 24b, 43b
, 43c, 44b, 44c, 44e,
53b, 53c, 54b. 54d, 73b, 73c, 74b, 74cm electrode removal part 23c, 24c, 54c... division part 23d,
24d, 43d, 53d... Electrode part 28... Sealing agent 29... Liquid crystal 30.77... Display area 31.55.75... Upper electrode extraction part 32.76...
・Lower electrode extraction part- Fig. 1 Fig. 2 Fig. 3f Fig. 3 Fig. 4 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 76 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 figure

Claims (5)

[Claims] (1) Transparent electrodes are formed on each of a first substrate and a second substrate made of a polymer film, and the two substrates are bonded facing each other via a ring-shaped sealant, and the two substrates, the sealant, etc. A liquid crystal is sealed in an enclosure defined by a liquid crystal, a display area is formed in the liquid crystal enclosure range, and further, the substrate is extended with a transparent electrode toward the outside of the display area to form an electrode extraction part. In the display element, at least one of the transparent electrodes of the two substrates is provided with an electrode removal portion formed at an edge portion outside the display area to prevent a short circuit due to contact between the edge portions of the two substrates. A liquid crystal display element. (2) Transparent electrodes are formed over substantially the entire area of both substrates, and an electrode removed portion is formed substantially parallel to one transparent electrode, and an electrode removed portion is formed substantially parallel to the other transparent electrode. 2. A liquid crystal display element according to claim 1, characterized in that these are substantially perpendicular to each other. (3) An electrode extraction portion is provided on one of the substrates, a pair of slit-shaped electrode removal portions are formed in the transparent electrode of the one substrate, and the electrode removal portions allow the transparent electrode to be removed from both the electrodes. The transparent electrode of the other substrate is divided into an electrode portion between the removed portions and an outer dividing portion, and an electrode removed portion is formed on the transparent electrode of the other substrate to form an electrode portion between the two electrode removed portions, The divided part of the transparent electrode is electrically connected to the electrode part of the other transparent electrode, and the divided part is used as an electrode extraction part on the other transparent electrode side. Liquid crystal display element. (4) electrode extraction portions are formed on both of the substrates extending in directions substantially orthogonal to each other;
3. The liquid crystal display element according to claim 2, wherein a slit-shaped divided portion is formed in the electrode portion between the two electrode removed portions, substantially parallel to the electrode removed portion. (5) An electrode removed portion is formed on the transparent electrode of the other substrate to form an electrode portion between the two electrode removed portions, and a divided portion is formed approximately parallel to both the electrode removed portions to form the electrode portion. is divided into a plurality of parts, each divided electrode part and each divided part of the one transparent electrode are electrically connected, and each divided part is used as an electrode extraction part on the side of each divided electrode part. A liquid crystal display element according to claim 3.