Patent Publication Number: US-2013233466-A1

Title: Method and device for injecting liquid crystal of film substrate

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application of International Application PCT/JP2010/073463 filed on Dec. 24, 2010 and designated the U.S., the entire contents of which are incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The embodiment described in the present specification is related to a method and a device for injecting a liquid crystal of a film substrate. 
     BACKGROUND OF THE INVENTION 
     Conventionally, there has been a liquid crystal panel which is designed so that the electrode of the transparent substrate provided with a transparent electrode is bonded with and faces the electrode of another substrate, a liquid crystal material is sealed between the transparent substrates, and a voltage is applied between the electrodes, thereby allowing the liquid crystal material to cause a reaction for display. 
     A method for injecting a liquid crystal material into a liquid crystal panel may be a method of injecting a liquid crystal material from an aperture provided in the sealing frame unit for bonding a first substrate and a second substrate. 
     This injecting method is briefly described below with reference to  FIGS. 6A through 6C  and  7 A through  7 I. 
     As illustrated in  FIGS. 6A through 6C , a first substrate  110  and a second substrate  120  each of which is formed by a transparent film is bonded by a rectangular sealing frame unit  130 . An aperture  131  for injection of a liquid crystal material is formed in one of the four sides of the sealing frame unit  130 . The sealing frame unit  130  seals the liquid crystal material described later between the first substrate  110  and the second substrate  120 . 
     As illustrated in  FIG. 7A , the first substrate  110  and the second substrate  120  bonded by the sealing frame unit  130  are stored in a housing not illustrated in the attached drawings, and decompressed (placed in a decompressed state) until, for example, the inside of the housing is placed in a vacuum. 
     Then, as illustrated in  FIG. 7B , with the first substrate  110  and the second substrate  120  placed in a vacuum, the sides of the apertures  131  illustrated in  FIGS. 6A and 6B  of the sealing frame units  130  are soaked in a liquid crystal material  140  in a liquid crystal vessel  170 . 
     As illustrated in  FIGS. 7C and 7D , when the decompressed state in the housing not illustrated in the attached drawings is released and replaced with a normal pressure state, an outside air pressure P is applied to the liquid crystal material  140 , and the liquid crystal material  140  is filled in the sealing frame unit  130 . Then, as illustrated in  FIG. 7E , the first substrate  110  and the second substrate  120  are taken out of the liquid crystal material  140  in the liquid crystal vessel  170 . 
     Then, as illustrated in  FIG. 7F , the sides of the apertures  131  of the sealing frame units  130  ( FIGS. 6A and 6B ) of the first substrate  110  and the second substrate  120  are soaked in a sealing material  151  in a sealing material vessel  180 . 
     Then, as illustrated in  FIG. 7G , when the first substrate  110  and the second substrate  120  are taken out of the sealing material  151  in the sealing material vessel  180 , the sealing material  151  adheres to the first substrate  110  and the second substrate  120 . 
     Next, as illustrated in  FIG. 7H , using ultraviolet rays UV, the ultraviolet irradiation unit  160  cures the adhered sealing material  151  (curable sealing material  152 ) . Then, as illustrated in  FIG. 7I , a part  152 ′ of the curable sealing material  152  is removed along the surfaces of the first substrate  110  and the second substrate  120 . 
     When the liquid crystal material is injected, a jig having the concave part for containing the amount of the injected liquid crystal material is made to closely contact the liquid crystal inlet by moving the jig upward to the outside of the liquid crystal material, thereby injecting the liquid crystal material (for example, patent document 1). 
     In addition, when the liquid crystal material is injected, it may be injected from the liquid crystal suction holder to the liquid crystal inlet with the liquid crystal suction holder, which is soaked in the liquid crystal material, held by a support member (for example, patent document 2). 
     Furthermore, when the liquid crystal material is injected, it may be injected from the liquid crystal material to the liquid crystal inlet with the liquid crystal suction holder, which is soaked in the liquid crystal material, positioned by a positioning member (for example, patent document 3). 
     Patent Document 1: Japanese Laid-open Patent Publication No. 2004-341236 
     Patent Document 2: Japanese Laid-open Patent Publication No. 2005-181601 
     Patent Document 3: Japanese Laid-open Patent Publication No. 2005-345500 
     SUMMARY OF THE INVENTION 
     The method for injecting a liquid crystal material into a film substrate disclosed by the present specification includes: a contacting step of forming a gap between a liquid crystal inlet of the film substrate and a bottom of a liquid crystal vessel which stores the liquid crystal material by making the film substrate contact a contact part provided for the liquid crystal vessel; and an injecting step of injecting the liquid crystal material into the liquid crystal inlet with the film substrate contacting the contact part. 
     The liquid crystal injection device which injects a liquid crystal material into a film substrate disclosed by the present specification includes a liquid crystal vessel which stores the liquid crystal material, and the liquid crystal vessel includes a contact part which forms a gap between a liquid crystal inlet of the film substrate and a bottom of the liquid crystal vessel by making the liquid crystal vessel contact the film substrate. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1A  is a partial sectional view (1) of the liquid crystal injection device according to an embodiment of the present invention; 
         FIG. 1B  is a partial sectional view (2) of the liquid crystal injection device according to an embodiment of the present invention; 
         FIG. 2A  is a sectional view (1) along A-A in  FIG. 1B ; 
         FIG. 2B  is a sectional view (2) along A-A in  FIG. 1B ; 
         FIG. 3A  is a partial sectional view (1) of the liquid crystal injection device according to another embodiment of the present invention; 
         FIG. 3B  is a partial sectional view (2) of the liquid crystal injection device according to another embodiment of the present invention; 
         FIG. 4  is an enlarged view of the part B in  FIG. 3B ; 
         FIG. 5  is a sectional view of the groove having a U-shaped section according to a variation example according to another embodiment; 
         FIG. 6A  is an exploded view of the film substrate for explanation of the control liquid crystal injecting method; 
         FIG. 6B  is a plan view of the film substrate for explanation of the control liquid crystal injecting method; 
         FIG. 6C  is a sectional view along C-C in  FIG. 6B ; 
         FIG. 7A  is a sectional view (1) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7B  is a sectional view (2) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7C  is a sectional view (3) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7D  is a sectional view (4) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7E  is a sectional view (5) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7F  is a sectional view (6) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7G  is a sectional view (7) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7H  is a sectional view (8) for explanation of the conventional liquid crystal injecting method; 
         FIG. 7I  is a sectional view (9) for explanation of the conventional liquid crystal injecting method; 
         FIG. 8  is an explanatory view (1) for explanation of the usage of a liquid crystal material; and 
         FIG. 9  is an explanatory view (2) for explanation of the usage of a liquid crystal material. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     In the method of injecting a liquid crystal material as explained above with reference to  FIGS. 6A through 6C  and  7 A through  7 I, when the liquid crystal material  140  is insufficient when the lima is injected from the aperture  131 , air or a gas enters the sealing frame unit  130 , and the unit is not filled with the liquid crystal material  140 . Therefore, the quantity of the liquid crystal material  140  larger than the necessary quantity of the liquid crystal material  140  to be injected into the sealing frame unit  130  is to be stored in the liquid crystal vessel  170 . 
     Furthermore, as illustrated in  FIG. 8 , when a plurality of liquid crystal panels  101  (before injecting the liquid crystal material  140 ) provided with the first substrate  110  and the second substrate  120  are to be inserted into the liquid crystal material  140  in the liquid crystal vessel  170 , and if the intervals between the liquid crystal panels  101  are short (interval G 1 ) as the liquid crystal panels  101 - 1  on the right in  FIG. 8 , the surface tension forces the liquid crystal material  140  to enter the gap between the liquid crystal panels  101 . 
     On the other hand, if the intervals between the liquid crystal panels  101  are long as the liquid crystal panels  101 - 2  on the left in  FIG. 8  (gap G 2 ) , the quantity of the liquid crystal material  140  stored in the liquid crystal vessel  170  increases for the gap. 
     To keep the intervals between the liquid crystal panels  101  as described above, the excess amount of liquid crystal material  140  is necessary. However, to maintain a liquid crystal inlet  101   a  of the liquid crystal panel  101  in the liquid crystal material  140  when the liquid crystal material  140  is injected, there is a method for inserting the liquid crystal inlet  101   a  into the liquid crystal vessel  170  by filling the liquid crystal vessel  170  with an excess of liquid crystal material  140 . 
     Concretely, when the liquid crystal inlet  101   a  reaches the flat bottom of the liquid crystal vessel  170 , the liquid crystal inlet  101   a  is blocked. Therefore, the liquid crystal panel  101  is held by the jig as lifted at least by the minimum gap (G 3 ) between the liquid crystal panel  101  and the bottom of the liquid crystal vessel  170 . 
     However, depending on the production accuracy of the liquid crystal panel  101  and the position accuracy of a jig, the height of the liquid crystal inlet  101   a  is not constant for the liquid crystal panel  101 - 4  at the center or the liquid crystal panel  101 - 5  on the right as illustrated in  FIG. 9 . 
     Therefore, the level of the liquid crystal inlet  101   a  (the level of the right liquid crystal panel  101 - 5  in  FIG. 9 ) at the highest of all (farthest from the bottom of the liquid crystal vessel  170 ) is set as the lowest liquid surface level S. Since the liquid crystal material  140  is to be stored up to the level higher than the lowest liquid surface level S, the liquid crystal material  140 - 1  above the lowest liquid surface level S is stored in the liquid crystal panel  101 , but the liquid crystal material  140 - 2  below the lowest liquid surface level S is stored in excess of the necessary quantity. 
     Generally, when the quantity of the liquid crystal material  140  stored in the liquid crystal vessel  170  increases, the time period in which the liquid crystal material  140  is exposed to air becomes longer and the material is contaminated (absorbs water), and is not available, thereby causing the problem of wasteful liquid crystal materials. 
     The method and the device for injecting the liquid crystal for a film substrate according to the embodiment of the present invention are described below with reference to the attached drawings. 
       FIGS. 1A and 1B  are partial sectional views of the liquid crystal injection device  10  according to an embodiment of the present invention. 
       FIGS. 2A and 2B  are sectional views along A-A in  FIG. 1B . 
     A liquid crystal injection device  10  illustrated in  FIGS. 1A and 1B  includes a liquid crystal vessel  11  which stores a liquid crystal material  2 , and a jig  12  which supports a film substrate  1  at least upward perpendicularly. The liquid crystal injection device  10  injects the liquid crystal material  2  into the film substrate  1  as, for example, a liquid crystal panel. 
     The film substrate  1  is formed by bonding two substrates each of which is made of a flexible film. At least one of these two substrates is transparent is transparent and the transparent electrodes not illustrated in the attached drawings are bonded as facing each other. The film substrate  1  is rectangular, and a projection  1   b  which protrudes as a rectangle is formed on one of the four sides of the rectangle. The end of the projection  1   b  is a liquid crystal inlet  1   a  into which the liquid crystal material  2  is injected. 
     The liquid crystal vessel  11  has a convex part  13  as an example of the contact part. The convex part  13  forms a gap G illustrated in  FIG. 2A  between the liquid crystal inlet  1   a  of the film substrate  1  and the bottom of the liquid crystal vessel  11  by contacting the film substrate  1 . 
     The convex part  13  protrudes upward from the bottom of the liquid crystal vessel  11  and has a longitudinal direction in the array direction. Concretely, the convex part  13  is formed so that a triangular pole member may lie in the array direction of the film substrate  1  with one of the three rectangular planes contacting the bottom of the liquid crystal vessel  11 , thereby providing a triangular section. 
     The convex part  13  linearly contacts a part of a liquid crystal inlet  11   a  of the film substrate  1  at the upper end linearly extruded in the longitudinal direction. The convex. part  13  may be provided as a unitary construction with the liquid crystal vessel  11 , or provided by arranging another member in the liquid crystal vessel  11 . 
     The jig  12  is arranged for each film substrate  1 , and a plurality of jigs  12  independently rise and fall. The jig  12  supports the film substrate  1  upward perpendicularly on both sides of the bottom with the projections  1   b  of the film substrate  1  interposed between them. The jig  12  may prevent the film substrate  1  from tilting by, for example, supporting the projection  1   b  of the film substrate  1 , horizontally supporting the film substrate  1  in the direction of thickness on both sides with the projection  1   b  interposed, etc. 
     The method for injecting the liquid crystal according to an embodiment of the present invention is described below with some points overlapping the description above appropriately omitted. 
     First, as illustrated in  FIG. 1A , a plurality of film substrates  1  are supported by a plurality of jigs  12 , which independently rise and fall, above the liquid crystal vessel  11  for storing the liquid crystal material  2 . In this case, the height of the liquid crystal inlet  1   a  fluctuates for each film substrate  1  depending on the production accuracy of the film substrate  1  and the position accuracy of the jig  12 . 
     Next, as illustrated in  FIG. 1B , the liquid crystal inlet  1   a  of the film substrate  1  contacts the convex part  13  provided in the liquid crystal vessel  11  by the fall of the jig  12 . Thus, as illustrated in  FIG. 2A , the gap G is formed at equal intervals between the liquid crystal inlet  1   a  and the bottom of the liquid crystal vessel  11  (contacting step). 
     Then, by the fall of the jig  12  even after the contact of the film substrate  1  with the convex part  13 , the perpendicularly upward support of the jig  12  on the film substrate  1  is released, and the positions of the liquid crystal inlets  1   a  of the plurality of film substrates  1  match on the convex part  13 . By the horizontal support of the jig  12  on the film substrate  1 , the film substrate  1  may be positioned although the perpendicularly upward support is released. 
     Next, the liquid crystal material  2  is injected through the liquid crystal inlet  1   a  from the gap G with the film substrate  1  in contact with the convex part  13  (injecting step). 
     The film substrate  1  is stored in, for example, a housing not illustrated in the attached drawings, the housing is kept in the decompressed state, the liquid crystal inlet  1   a  is inserted into the liquid crystal material  2  in the decompressed state in the contacting step, and then the liquid crystal material  2  is injected from the liquid crystal inlet  1   a  by changing the decompressed state in the housing not illustrated in the attached drawings into the normal pressure state. 
     As illustrated in  FIG. 2B , in the injecting step, the liquid crystal material  2  is gathered around the convex part  13  by the surface tension even with the level of the liquid of the liquid crystal material  2  in the liquid crystal vessel  11  lower than the convex part  13 , and the gathered liquid crystal turns into a liquid pool  2 - 1 , and contacts the liquid crystal inlet  1   a , thereby injecting the liquid crystal into the film substrate  1 . 
     The liquid crystal vessel  11  according to the present embodiment is made of, for example, aluminum, and it is designed so that the liquid pool  2 - 1  may be easily formed on the convex part  13  by forming a fluorine coating part (an example of a coating part) for preventing the invasion of the liquid crystal material  2 . 
     After the injection of the liquid crystal material  2 , the sealing material for sealing the liquid crystal material  2  is injected through the liquid crystal inlet  1   a  and cured by ultraviolet rays etc., thereby completing the seal of the liquid crystal material  2  on the film substrate  1 . 
     According to the present embodiment described above, the gap is formed between the liquid crystal inlet  1   a  of the film substrate  1  and the bottom of the liquid crystal vessel  11  by the film substrate  1  contacting the convex part  13  provided for the liquid crystal vessel  11  for storing the liquid crystal material  2  (contacting step). In addition, the liquid crystal material  2  is injected through the liquid crystal inlet  1   a  from the gap G with the film substrate  1  contacting the convex part  13  (injecting step). 
     Therefore, the liquid crystal inlet  1   a  of the film substrate  1  may be prevented from being blocked by the bottom of the liquid crystal vessel  11 . In addition, the liquid crystal material  2  may be prevented from being excessively stored in the liquid crystal vessel  11  depending on the variance of the level of the film substrate  1  by forming the convex part  13  with the smallest possible number of gaps G for injection of the liquid crystal material  2 . 
     Therefore, according to the present embodiment, the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11  may be reduced. 
     According to the present embodiment, the convex part  13  as an example of the contact part which contacts the film substrate  1  is provided for the liquid crystal vessel  11 . Therefore, the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11  may be reduced with a simple configuration. 
     According to the present embodiment, the convex part  13  linearly contacts the liquid crystal inlet  1   a  of the film substrate  1 . Therefore, the gap G between the liquid crystal inlet  1   a  and the bottom of the liquid crystal vessel  11  may be constantly made regardless of the production accuracy of the film substrate  1 , thereby further reducing the quantity of the liquid crystal material  2  to be stored in the liquid crystal vessel  11 . 
     In addition, in the injecting step according to the present embodiment, the liquid pool  2 - 1  of the liquid crystal material  2  formed in the convex part  13  by the surface tension is injected through the liquid crystal inlet  1   a  with the liquid level of the liquid crystal material  2  in the liquid crystal vessel  11  lower than the liquid crystal material  2 . Therefore, although the liquid level of the liquid crystal material  2  is lower than the gap G between the liquid crystal inlet  1   a  and the bottom of the liquid crystal vessel  11 , the liquid crystal material  2  may be injected, thereby further reducing the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11 . 
     In the contacting step according to the present embodiment, the film substrate  1  is made to contact the convex part  13  by lowering the jig  12  which supports at least upward perpendicularly, and the perpendicularly upward support of the jig  12  on the film substrate  1  is released by lowering the jig  12  even after the contact of the film substrate  1  with the convex part  13 . Therefore, the variance of the level of the film substrate  1  may be suppressed without fail, and the quantity of the film substrate  1  stored in the liquid crystal vessel  11  may be further reduced. 
       FIGS. 3A and 3B  are partial sectional views of the liquid crystal injection device according to another embodiment of the present invention.  FIG. 4  is an enlarged view of the part B in  FIG. 3B . 
     According to the present embodiment, as an example of the contact part, not the convex part  13 , but a concave part  23   a  of a projection  23  is provided, which is different from the embodiment described above. Otherwise, the present embodiment is generally the same as the embodiment described above. The difference is mainly described below. 
     The liquid crystal injection device  20  illustrated in  FIGS. 3A and 3B  includes the liquid crystal vessel  11  which stores the liquid crystal material  2 , and the jig  12  which supports the film substrate  1  at least upward and perpendicularly, and injects the liquid crystal material  2  into the film substrate  1  which is, for example, a liquid crystal panel. 
     The liquid crystal vessel  11  has the concave part  23   a  as an example of the contact part formed in the concave part  23   a . The concave part  23   a  forms the gap G illustrated in  FIG. 4  between the liquid crystal inlet  1   a  of the film substrate  1  and the bottom of the liquid crystal vessel  11  by contacting the film substrate  1 . 
     The projection  23  protrudes upward from the bottom of the liquid crystal vessel  11 . The concave part  23   a  is a groove having the longitudinal direction and extending in the direction (longitudinal direction of the liquid crystal inlet  1   a ) orthogonal to the array direction of the film substrate  1 . Concretely, the concave part  23   a  is a groove having a V-shaped section which linearly contacts the periphery (2 opposite sides) of the inlet where the liquid crystal inlet  1   a  of the film substrate  1  is formed as illustrated in  FIG. 4 . 
     The projection  23  may have a unitary construction with the liquid crystal vessel  11  or may be provided by arranging another member for the liquid crystal vessel  11 . 
     Described below is the liquid crystal injecting method according to another embodiment by appropriately omitting some overlapping points described above. 
     First, as illustrated in  FIG. 3A , the film substrates  1  are supported by a plurality of jigs  12  which independently rise and fall above the liquid crystal vessel  11  which stores the liquid crystal material  2 . In this case, the level of the liquid crystal inlet  1   a  fluctuates for each film substrate  1  depending on the production accuracy of the film substrate  1  and the position accuracy of the jig  12 . 
     Next, as illustrated in  FIG. 3B , when the jig  12  falls, the liquid crystal inlet  1   a  of the film substrate  1  linearly contacts the two planes which form a V shape of the concave part  23   a  of the projection  23  provided for the liquid crystal vessel  11 . Thus, a gap G is formed between the liquid crystal inlet  1   a  and the bottom (the bottom of the concave part  23   a  in the present embodiment) of the liquid crystal vessel  11  (contacting step). 
     Then, even after the film substrate  1  contacts the concave part  23   a , the fall of the jig  12  releases the perpendicularly upward support of the jig  12  on the film substrate  1 , and the positions of the liquid crystal inlets  1   a  of the plurality of film substrates  1  match the contact positions of the concave parts  23   a . By the jig  12  horizontally supporting the film substrate  1 , the film substrate  1  may be positioned even after the release of the perpendicularly upward support. 
     Next, the liquid crystal material  2  is injected through the liquid crystal inlet  1   a  from the gap G described above with the film substrate  1  contacting the concave part  23   a  (injecting step) . 
     After the injection of the liquid crystal material  2  is completed, the sealing material for sealing the liquid crystal material  2  is injected through the liquid crystal inlet  1   a  and cured by ultraviolet rays etc., thereby completing the seal of the liquid crystal material  2  on the film substrate  1 . 
     According to the present embodiment described above, the gap G is formed between the liquid crystal inlet  1   a  of the film substrate  1  and the bottom of the liquid crystal vessel  11  by the film substrate  1  contacting the concave part (contact part)  23   a  provided for the liquid crystal vessel  11  which stores the liquid crystal material  2  (contacting step). Furthermore, in the contact state between the film substrate  1  and the concave part  23   a , the liquid crystal material  2  is injected from the gap G through the liquid crystal inlet  1   a  (injecting step). 
     Therefore, according to the present embodiment, as with the embodiment described above, the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11  may be reduced. 
     According to the present embodiment, as an example of a contact part which the film substrate  1  contacts, the concave part  23   a  of the projection  23  is provided for the liquid crystal vessel  11 . Therefore, the liquid crystal material  2  may be collected in the concave part  23   a  and the quantity of the liquid crystal material  2  may be reduced with a simple configuration. Furthermore, since the liquid crystal material  2  different for each concave part  23   a  may be stored, the liquid crystal material  2  may be injected simultaneously into different types of film substrates  1 . 
     Furthermore, according to the present embodiment, the concave part  23   a  contacts the periphery (two opposite sides) of the inlet forming sides which form the liquid crystal inlet  1   a  of the film substrate  1 . Therefore, since the gap G between the liquid crystal inlet  1   a  and the bottom (the bottom of the concave part  23   a ) of the liquid crystal vessel  11  may be regulated independent of the production accuracy of the jig  12  and the film substrate  1 , the liquid crystal may be injected at the shortest possible intervals the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11  may be furthermore reduced. 
     Furthermore, according to the present embodiment, the concave part  23   a  is a groove which extends in the longitudinal direction of the liquid crystal inlet  1   a . Therefore, the gap G between the liquid crystal inlet  1   a  and the bottom (the bottom of the concave part  23   a ) of the liquid crystal vessel  11  may be maintained without fail by the concave part  23   a  contacting the liquid crystal inlet  1   a  in the longitudinal direction of the liquid crystal inlet  1   a , thereby further reducing the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11 . 
     According to the present embodiment, the concave part  23   a  is a groove having a V-shaped section. Therefore, the gap G between the liquid crystal inlet  1   a  and the bottom (the bottom of the concave part  23   a ) of the liquid crystal vessel  11  may be constant by the concave part  23   a  contacting the film substrate  1  on the two V-shaped planes, thereby furthermore reducing the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11 . 
     In addition, in the contacting step according to the present embodiment, the film substrate  1  is made to contact the concave part  23   a  by lowering the jig  12  which supports the film substrate  1  at least perpendicularly upward, and the jig  12  is made to lower even after the film substrate  1  contacts the concave part  23   a , thereby releasing the perpendicularly upward support of the jig  12  on the film substrate  1 . Accordingly, the variance of the height of the film substrate  1  may be suppressed without fail, and the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11  may be furthermore reduced. 
     According to the present embodiment, the concave part  23   a  which is a groove having a V-shaped section formed on the projection  23  as illustrated in  FIG. 4  is explained as an example of the contact part, but the contact part may be a concave part  33   a  as a U-shaped groove formed on a projection  33  as a variation example illustrated in  FIG. 5  or any other concave parts to reduce the quantity of the liquid crystal material  2  stored in the liquid crystal vessel  11 . 
     In addition, in the above-mentioned embodiment and another embodiment, the convex part  13 , the concave parts  23   a  and  33   a , etc. are examples of the contact part, but the contact part may be two or more convex or concave parts for each film substrate  1  such as convex and concave surfaces of a rough surface etc. 
     Although the attached drawings illustrate the hatching indicating a section in a drawing, but the types of hatching do not restrict the material.