JP2007011102A - Liquid crystal dish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal dish capable of sufficiently reducing the amount of liquid crystal wasted during suction by a liquid crystal device. <P>SOLUTION: The liquid crystal dish 1 has walls 4 and a bottom 5 for pooling liquid crystal 3 to be sucked in a liquid crystal panel 2. The bottom 5 has a thin and long top surface 51, and the walls 4 surround the top surface 51 to the entire periphery; and the top surface 51 is lower than any of upper ends of the walls 4 and on the bottom 5, grooves 52 which extend along the length of the top surface 51 are formed on respective long edge sides of the top surface 51 while including the walls 4 as flanks. The liquid crystal dish 1 has a portion (center surface 51a) where the grooves 52 are not formed on the top surface 51 above a portion (bottom surface 52a) where the grooves are formed, so the amount of liquid crystal which should be pooled can sufficiently be reduced. Further, the liquid crystal 3 hardly overflows because of the presence of grooves 52. Consequently, the amount of liquid crystal 3 which is wasted can sufficiently be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal dish for storing liquid crystal sucked by a liquid crystal device.

  In the manufacturing process of the liquid crystal device, liquid crystal is sealed inside. As the sealing method, two panels are bonded so as to sandwich the liquid crystal, and the suction port formed in the liquid crystal device is immersed in the liquid crystal so that the external pressure is higher than the internal pressure of the liquid crystal device. There is a method of injecting by sucking from the suction port. The latter method includes so-called vacuum suction.

  Patent Document 1 discloses a liquid crystal injection process by vacuum suction. Specifically, a liquid crystal cell and a liquid crystal container containing liquid crystal are arranged in a vacuum chamber, the vacuum chamber is depressurized to exhaust the liquid crystal cell and degas the liquid crystal, and the base on which the liquid crystal container is placed The liquid crystal is brought into contact with the inlet, and the vacuum chamber is returned to atmospheric pressure. Thereby, the liquid crystal is injected into the liquid crystal cell through the injection port. Thereafter, the injection port is sealed.

Patent Document 2 discloses a liquid crystal injection tray that stores liquid crystal for vacuum suction. There is a liquid crystal reservoir on the upper surface of the liquid crystal injection dish, and an uneven portion is provided on the bottom of the liquid crystal injection dish in order to promote degassing of the liquid crystal. Both the liquid crystal injection dish and the liquid crystal container described above are dish-shaped jigs for storing liquid crystal sucked by the liquid crystal device. In the present specification, such jigs are referred to as “liquid crystal dishes”.
Japanese Patent Laying-Open No. 2001-264784 (FIG. 3) Japanese Patent Laid-Open No. 5-232484 (FIG. 1)

  By the way, the existing liquid crystal dish has a sufficient capacity so that liquid crystal can be injected into liquid crystal devices of various sizes. On the other hand, when liquid crystal is sucked into the liquid crystal device by vacuum suction, as shown in FIG. 8 of Patent Document 2, the liquid crystal is usually stored in a full liquid crystal dish and used. Therefore, in the actual injection process, a very large part of the liquid crystal stored in the liquid crystal dish is discarded without being injected into the liquid crystal device. This is useless. In addition, since the liquid crystal is relatively expensive in the material constituting the liquid crystal device, wasteful disposal of the liquid crystal is one factor that increases the manufacturing cost of the liquid crystal device.

  In order to reduce the waste, it is conceivable to reduce the amount of liquid crystal stored in the container by taking into account that the liquid crystal stored in the container rises due to surface tension. However, since there is a limit to the height at which the liquid crystal can rise due to surface tension, the amount of liquid crystal used cannot be reduced sufficiently even by this device.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal dish that can sufficiently reduce the amount of liquid crystal that is wasted during suction by a liquid crystal device.

  In order to reduce the amount of wasted liquid crystal while allowing suction by the liquid crystal device, raising the bottom of the liquid crystal dish can be considered. If the bottom is raised, the volume of the liquid crystal dish becomes smaller, so that the amount of liquid crystal that must be stored in the liquid crystal dish is sufficiently reduced, and as a result, the amount of wasted liquid crystal is expected to be sufficiently reduced. However, if the bottom of the LCD pan is simply raised so that the amount of liquid crystal that must be stored is sufficiently reduced, the difference in height between the top of the bottom and the top of the wall will be reduced at the wall, and the LCD will likely spill. End up.

  In addition, when the amount of liquid crystal put into the liquid crystal dish is small, a phenomenon in which liquid crystals are scattered in an island shape due to water repellency on the upper surface of the bottom may occur. Since the liquid crystal that can be injected into the liquid crystal device by suction is limited to the liquid crystal on the island that is in contact with the suction port formed in the liquid crystal device, a sufficient amount of liquid crystal can be injected when the above phenomenon occurs. There is a risk that it will be impossible. Therefore, when the above phenomenon occurs, it is necessary to perform an operation of extending the liquid crystals scattered in islands into a lump. This operation is a manual operation, and if the power is adjusted incorrectly, the liquid crystal will spill out of the liquid crystal dish over the wall. Since it is such a delicate work, if the bottom is simply raised and the wall is lowered, the liquid crystal easily spills over the wall from the liquid crystal dish.

  On the other hand, the liquid crystal dish according to the present invention is a liquid crystal dish for storing liquid crystal sucked by the liquid crystal device, and includes a bottom and a wall for storing liquid crystal, the bottom having an elongated upper surface, and the wall Surrounds the entire upper surface, the upper surface is lower than any upper end of the wall, and at the bottom, a groove extending in the longitudinal direction of the upper surface with the wall as a side surface is formed on each long side of the upper surface. It is characterized by being.

  According to this liquid crystal dish, a groove is formed on the long side of the upper surface with the wall as a side surface at the bottom. Therefore, since the upper surface of the portion where the groove is not formed (center portion) is above the upper surface of the portion where the groove is formed, the amount of liquid crystal that must be stored in the liquid crystal dish can be sufficiently reduced. In addition, the height difference (the height of the wall) between the upper surface of the portion where the groove is formed and the upper end of the wall is larger than the height difference between the upper surface of the portion where the groove is not formed and the upper end of the wall. It is hard to spill. Therefore, according to this liquid crystal dish, the amount of wasted liquid crystal can be sufficiently reduced. This leads to a reduction in the manufacturing cost of the liquid crystal device. Further, since the groove is formed at the wall, the liquid crystal is easily spread without being scattered.

  In addition, although the uneven | corrugated | grooved part is provided in the bottom part of the liquid crystal dish described in patent document 2, the groove | channel of this uneven | corrugated | grooved part is not in contact with the wall part of the liquid crystal reservoir in the width direction. Therefore, the above-described effect cannot be obtained with this liquid crystal dish.

  In the liquid crystal dish according to the present invention, the groove may extend over the entire length of both the long sides, or the groove may surround the upper surface over the entire circumference. According to the former aspect, since the portion where the height difference between the upper surface of the bottom and the upper end of the wall is sufficiently large extends at least the long sides of the upper surface, the liquid crystal is more difficult to spill. Therefore, the amount of wasted liquid crystal can be further reduced. On the other hand, according to the latter aspect, since the above portion extends at least around the entire upper surface, the liquid crystal is more difficult to spill than in the former aspect.

  Hereinafter, various embodiments according to the present invention will be described with reference to the accompanying drawings. In the drawings, the ratio of dimensions of each part is appropriately changed from the actual one.

<1. First Embodiment>
1 is a perspective view of the liquid crystal dish 1 according to the first embodiment of the present invention, FIG. 2 is a plan view of the liquid crystal dish 1, and FIG. 3 is a view when the liquid crystal dish 1 is cut along a plane A in FIG. It is sectional drawing.

  The liquid crystal dish 1 is a jig for storing liquid crystal 3 injected into a plate-like liquid crystal panel (liquid crystal device) 2 and is formed by subjecting a stainless steel surface formed in a rectangular parallelepiped shape to a water repellent process. Yes. This water repellent process is performed by coating the surface of stainless steel with a polytetrafluoroethylene resin known by the registered trademark of Teflon. Of course, other known water-repellent treatments can be employed.

  An elongated recess for storing the liquid crystal 3 is formed on the upper side of the liquid crystal dish 1. The recess is surrounded by a rectangular wall 4 over the entire circumference. The wall 4 is formed to rise from a rectangular parallelepiped bottom 5, and its upper end surface 4a is flat. The upper surface 51 of the bottom 5 is a rectangle extending in a substantially horizontal direction, and is also the bottom surface of the recess. On the bottom 5, a groove 52 having a uniform depth is formed around the upper surface 51 over the entire circumference. The cross section of the groove 52 is rectangular. The outer side surface of the groove 52 is flush with the inner peripheral surface 4 b of the wall 4.

  The upper end surface 4a of the wall 4 is above the flat rectangular central surface 51a surrounded by the groove 52 on the upper surface 52 in the vertical direction. The height difference between them (hereinafter referred to as the first height difference (D1)) is determined to be sufficiently small in order to make the volume of the liquid crystal dish 1 sufficiently small. For example, D1 = 0.5 mm.

  As shown in FIG. 3, one liquid crystal space 2 a to be filled with the liquid crystal 3 is formed in the liquid crystal panel 2. In addition, one suction port 2b that connects the liquid crystal space 2a and the external space is opened on the side surface of the liquid crystal panel 2. In the liquid crystal injection step, the liquid crystal 3 is injected into the liquid crystal panel 2 through the suction port 2b by so-called vacuum suction to fill the liquid crystal space 2a. When the liquid crystal space 2 a is filled with the liquid crystal 3, the suction port 2 b is sealed and the liquid crystal 3 is sealed in the liquid crystal panel 2.

  As is apparent from the above, the liquid crystal dish 1 is required to store an amount of liquid crystal 3 sufficient to fill the liquid crystal space 2a. In the present embodiment, as shown in FIG. 1, since it is assumed that the liquid crystal 3 is injected into a plurality of (for example, 40) liquid crystal panels 2 by one vacuum suction, the liquid crystal space to be filled with the liquid crystal 3 is used. Reference numeral 2a denotes a liquid crystal space 2a of the plurality of liquid crystal panels 2, and the total volume thereof is, for example, about 0.7 ml.

  In the vacuum suction described above, the liquid crystal panel 2 and the liquid crystal dish 1 in which the liquid crystal 3 is raised by the surface tension are placed in the vacuum chamber, and then the vacuum chamber is decompressed to exhaust the liquid crystal panel 2 and the liquid crystal 3. The procedure of defoaming, placing the liquid crystal dish 1 and the liquid crystal panel 2 so that the upper end of the raised liquid crystal 3 is in contact with the suction port 2b and closing the suction port 2b, and then returning the vacuum chamber to atmospheric pressure. Done in

  Therefore, depending on the arrangement of the liquid crystal dish 1, the liquid crystal 3 is required to be raised and stored by surface tension so as to contact the suction port 2b and close the suction port 2b. This applies not only to vacuum suction but also to an arbitrary injection method for sucking liquid crystal using a pressure difference. In the present embodiment, it is assumed that the liquid crystal 3 is injected into the plurality of liquid crystal panels 2 by one vacuum suction, and therefore there are a plurality of suction ports 2b that the liquid crystal 3 stored in the liquid crystal dish 1 should contact and close. .

  From the viewpoint of reducing the amount of liquid crystal 3 used for suction, the volume of the liquid crystal dish 1 (the amount of liquid crystal 3 that can be stored in the liquid crystal dish 1) is small within a range sufficient to fill the liquid crystal space 2a. Better. As a method for reducing the volume of the liquid crystal dish 1, a method of narrowing the spread of the concave portion and a method of reducing the depth of the concave portion are conceivable. In the former method, the distance between the inner peripheral surfaces 4b of the wall 4 is made as short as possible within the above range. However, since the suction port 2b must be blocked by the liquid crystal 3 swelled by the surface tension, it is difficult to significantly reduce the distance, and the distance must be the same as that of an existing liquid crystal dish. Absent. Therefore, in this embodiment, the latter method is adopted.

  The latter method is a method in which the bottom 5 is raised as much as possible within a range in which a sufficient amount of the liquid crystal 3 can be stored to fill the liquid crystal space 2a. However, when the bottom 5 is simply raised, the height difference between the upper surface 51 of the bottom 5 and the upper end surface 4a of the wall 4 becomes small at the wall. Therefore, the liquid crystal 3 swelled by the surface tension is likely to spill from the liquid crystal dish 1. Therefore, in the present embodiment, by raising only the central surface 51a of the bottom 5, it is possible to reduce the volume to the limit and to prevent the liquid crystal 3 from spilling easily.

  By the way, as shown in FIG. 3, the liquid crystal 3 accumulated to the limit is swelled by its surface tension, and at least its central portion is positioned above the upper end surface 4a of the wall 4 in the vertical direction. Accordingly, if the height of the wall 4, that is, the height difference between the bottom surface 52 a of the groove 52 and the upper end surface 4 a of the wall 4 (hereinafter, the second height difference (D 2)) is too small, the liquid crystal 3 passes over the wall 4. It will be easy to spill.

  The operation of accumulating the liquid crystal 3 in the concave portion is a manual operation. For example, a person drops the liquid crystal 3 onto the central surface 51a with a dropper, and the island-like liquid crystal 3 attached on the central surface 51a by this dropping is removed. It is spread over the upper surface 51 by scratching with the tip of a dropper. At this time, the person may move the tip of the dropper in the direction from the center surface 51 a to the groove 52, or may move along the entire circumference or part of the groove 52. In any case, since the tip of the dropper and the liquid crystal 3 are guided by the groove 52, a person can easily spread the liquid crystal 3. However, if the second height difference (D2) is too small, for example, when the person moves the tip of the dropper from the central surface 51a to the groove 52 to widen the liquid crystal 3, the liquid crystal 3 spills over the wall 4. Is likely to occur.

  In view of these circumstances, in the present embodiment, the second height difference (D2) is determined so that the liquid crystal 3 does not easily spill from the liquid crystal dish 1. For example, D2 = 0.5 mm. Although it is better to reduce the second height difference (D2) based on the viewpoint of reducing the volume of the liquid crystal dish 1, the first height difference (D1) is mainly sufficient for this viewpoint. The second height difference (D2) is made as small as possible within a range in which the liquid crystal 3 does not easily spill from the liquid crystal dish 1. This is because the bottom surface 52a of the groove 52 is much narrower than the central surface 51a, and the volume of the liquid crystal dish 1 does not become so small even if the second height difference (D2) is reduced. In the same manner, the liquid crystal 3 having an amount sufficient to fill the liquid crystal space 2a is mainly dealt with by securing the first height difference (D1).

  The effects brought about by the liquid crystal dish 1 will be described in comparison with an existing liquid crystal dish or a liquid crystal dish obtained by simply raising the liquid crystal dish. However, the specific numerical values in the following description are such that any liquid crystal dish can inject liquid crystal 3 into 40 liquid crystal panels 2 by one vacuum suction, and 40 liquid crystal panels 2 Is an actual measurement value when it is necessary to inject a total of about 0.7 ml of liquid crystal 3, and is merely an example. Also, D1 = 0.5 mm and D2 = 0.5 mm.

  Since the existing liquid crystal dish is not raised, approximately 7.0 ml of liquid crystal 3 can be stored. When the liquid crystal 3 is stored in the liquid crystal dish as much as possible and used for vacuum suction, about 3.5 ml of the liquid crystal 3 remains. That is, about 90% of the liquid crystal 3 is wasted. On the other hand, if the liquid crystal 3 of about 5.5 ml to about 4.0 ml is not stored in the liquid crystal dish as much as possible, but the stored liquid crystal 3 is raised by surface tension, vacuum suction can be performed. . In this case, about 2.8 ml to about 5.5 ml of liquid crystal 3 remains. As described above, although the amount of the extra liquid crystal 3 is reduced, about 80% to about 85% of the liquid crystal 3 is still wasted. On the other hand, according to the liquid crystal dish 1, the waste liquid crystal 3 is about 64%. That is, the amount of wasted liquid crystal 3 can be sufficiently reduced. Therefore, the manufacturing cost of the liquid crystal panel 2 can be reduced.

In addition, the present invention has a remarkable effect on a liquid crystal dish obtained by modifying an existing liquid crystal dish.
FIG. 4 is a plan view showing an example of a liquid crystal dish obtained by simply raising the existing liquid crystal dish. In this liquid crystal dish, the depth of the recess is uniformly 0.3 mm. As shown in this figure, when the amount of the liquid crystal 3 is small, the liquid crystal 3 is scattered in an island shape. In such a case, as described above, it is necessary to manually spread the liquid crystal 3 to make a lump. However, since the wall is too low, the liquid crystal 3 is easily spilled from the recess, and the liquid crystal 3 is made to be a lump. Have difficulty.

  FIG. 5 is a cross-sectional view showing another example of a liquid crystal dish obtained by simply raising the existing liquid crystal dish. In this liquid crystal dish, the height of the wall, that is, the depth (D) of the concave portion near the wall is 0.5 mm. With this liquid crystal dish, the liquid crystal 3 does not easily spill out of the recess, so that the liquid crystal 3 can be easily made into one lump. However, the volume of the liquid crystal dish is much larger than the volume of the liquid crystal dish 1, and the amount of liquid crystal 3 that must be stored cannot be reduced sufficiently.

  On the other hand, according to the liquid crystal dish 1, in the bottom 5, the groove 52 having the wall 4 as a side surface is formed so as to surround the central surface 51a over the entire circumference. Therefore, the central surface 51 a is above the bottom surface 52 a of the groove 52. Therefore, the amount of liquid crystal 3 that must be stored can be sufficiently reduced. Further, since the second height difference (D2) is larger than the first height difference (D1), the liquid crystal 3 is hardly spilled. Therefore, the amount of wasted liquid crystal 3 can be sufficiently reduced. This leads to a reduction in manufacturing cost of the liquid crystal panel 2. Further, since the groove 52 is formed, there is an advantage that the liquid crystal is easily spread without being scattered.

<2. Second Embodiment>
FIG. 6 is a perspective view of the liquid crystal dish 6 according to the second embodiment of the present invention, and FIG. 7 is a plan view of the liquid crystal dish 6. Hereinafter, the liquid crystal dish 6 will be described with reference to these drawings, but the description of the same parts as the liquid crystal dish 1 will be omitted.

  In the bottom 7 of the liquid crystal dish 6, a groove 72 having a uniform depth is formed on both long sides of the upper surface 71 over the entire length of each long side, instead of the groove 52. The cross section of the groove 72 is rectangular, and the outer side surface thereof is flush with the inner peripheral surface 4 b of the wall 4. A central surface 71a which is a part of the upper surface 71 of the bottom 7 is sandwiched between two grooves 72 and is in contact with the wall 4 on both short sides. That is, the height of the wall 4 is high on both long sides of the upper surface 71 and low on both short sides.

  According to the liquid crystal dish 6, since the groove 72 is formed over the entire length of the corresponding long side, the liquid crystal is not easily spilled even though the volume is sufficiently small. Therefore, the amount of wasted liquid crystal can be sufficiently reduced. In the liquid crystal dish 6, there is a possibility that the liquid crystal is likely to spill from both short sides of the upper surface 71. However, by increasing the height difference between the central surface 71 a and the upper end 4 surface a of the wall 4, the liquid crystal is wasted. This possibility can be reduced while ensuring the effect of sufficiently reducing the amount. This is because the volume of the liquid crystal dish 6 is smaller when the above height difference and the first height difference (D1) in the liquid crystal dish 1 are the same.

<3. Third Embodiment>
FIG. 8 is a perspective view of the liquid crystal dish 8 according to the third embodiment of the present invention, and FIG. 9 is a plan view of the liquid crystal dish 8. Hereinafter, the liquid crystal dish 8 will be described with reference to these drawings, but the description of the same parts as the liquid crystal dish 6 will be omitted.

  In the bottom 9 of the liquid crystal dish 8, instead of the grooves 72, a plurality of grooves 92 (four in the example shown in the figure) of uniform depth along each long side on both long sides of the upper surface 71. Is formed. The cross section of the groove 92 is rectangular, and the outer side surface thereof is flush with the inner peripheral surface 4 b of the wall 4. A central surface 91a which is a part of the upper surface 91 of the bottom 9 is in contact with the wall 4 at a portion where the groove 92 is not formed. That is, the height of the wall 4 is high in the portion of the upper surface 91 where the grooves 92 on both long sides are formed, and is low on the portion where the grooves 92 on both long sides are not formed and on both short sides. Yes.

  According to the liquid crystal dish 8, since the plurality of grooves 92 are formed along the corresponding long sides, the liquid crystal does not easily spill though the volume is sufficiently small. Therefore, the amount of liquid crystal used can be sufficiently reduced. According to the liquid crystal dish 8, while ensuring the effect of sufficiently reducing the amount of wasted liquid crystal, the liquid crystal spills from the portion where the grooves 92 on both long sides of the upper surface 91 are not formed and from both short sides. The possibility of becoming easier can be reduced. The reason is the same as that of the liquid crystal dish 6.

<4. Modification>
8 and 9, the length of all the grooves 92 is unified as the liquid crystal dish 8, and the grooves 92 are paired on one long side and the other long side. Although the case where the front ends of the four grooves 92 reach the wall 4 is illustrated as an example, the present invention is not limited to this. For example, the lengths of the grooves 92 may be uneven, or the number of the grooves 92 may be different between one long side and the other long side.

  Alternatively, the liquid crystal dish 8 may be deformed so that a groove is formed on one or both short sides of the upper surface 91. One groove or a plurality of grooves may be formed per short side. In the case of one, the groove may be formed so as to extend over the entire short side. Further, the liquid crystal dish 6 may be deformed so that a groove is formed also on one or both short sides of the upper surface 71. In this modification, the liquid crystal dish 1 can be obtained if grooves are formed on both short sides over the entire short side.

  Moreover, although the cross section of the groove | channel was made into the rectangle in each embodiment mentioned above, the liquid crystal dish which concerns on each embodiment is deform | transformed, and it is good also as a V-shaped cross section as shown in sectional drawing of FIG. In the example shown in FIG. 10, only the outer surface of the two surfaces constituting the V-shape is inclined and spreads from the vertical direction, but not limited to this, only the inner surface is inclined and spreads from the vertical direction. Alternatively, both surfaces may be inclined and spread from the vertical direction.

  Further, in each of the above-described embodiments, the bottom surface of the groove is a flat surface extending in the horizontal direction. However, the liquid crystal dish according to each embodiment may be modified to be a surface that extends in a direction other than the horizontal direction, or a curved surface or the like. It is good also as an uneven surface. For example, in the example shown in the cross-sectional view of FIG. 11, the bottom surface of the groove is a curved surface spreading in a substantially horizontal direction. Note that the central surface, which is a part of the upper surface of the bottom, may be a surface that spreads in a direction other than the horizontal direction, or may be a surface with unevenness.

  Moreover, in each embodiment mentioned above, although the liquid-crystal dish is formed using stainless steel, you may use metal materials other than stainless steel. The shape of the liquid crystal dish is not limited to a rectangular parallelepiped shape. In short, it suffices if an elongated recess capable of storing a sufficient amount of liquid crystal is formed. Moreover, the upper end surface of the wall does not need to be flush. However, the center plane must be located lower than any upper end surface. Further, the width and depth of the groove may not be uniform.

1 is a perspective view of a liquid crystal dish 1 according to a first embodiment of the present invention. 2 is a plan view of the liquid crystal dish 1. FIG. It is sectional drawing when the liquid-crystal dish 1 is cut | disconnected by the surface A of FIG. It is a top view which shows an example of the liquid crystal plate which raised the existing liquid crystal plate simply. It is sectional drawing which shows the other example of the liquid crystal dish which raised the existing liquid crystal dish simply to the bottom. It is a perspective view of the liquid-crystal dish 6 which concerns on 2nd Embodiment of this invention. 3 is a plan view of a liquid crystal dish 6. FIG. It is a perspective view of the liquid-crystal dish 8 which concerns on 3rd Embodiment of this invention. 3 is a plan view of a liquid crystal dish 8. FIG. It is sectional drawing which shows the modification of the liquid-crystal dish which concerns on each embodiment of this invention. It is sectional drawing which shows the other modification of the liquid-crystal dish which concerns on each embodiment of this invention.

Explanation of symbols

  1, 6, 8 ... Liquid crystal dishes 1, 2 ... Liquid crystal panel, 2 b ... Suction port, 3 ... Liquid crystal, 4 ... Wall, 5, 7, 9 ... Bottom, 51, 71, 91 ... Groove, 4a ... upper end surface.

Claims (3)

In the liquid crystal dish that stores the liquid crystal that is sucked into the liquid crystal device,
It has a bottom and a wall for storing liquid crystal,
The bottom has an elongated top surface;
The wall surrounds the entire upper surface,
The upper surface is lower than the upper end of any of the walls;
In the bottom, a groove extending in the longitudinal direction of the upper surface with the wall as a side surface is formed on each long side of the upper surface.   The liquid crystal dish according to claim 1, wherein the groove extends over the entire length of the corresponding long side.   The liquid crystal dish according to claim 2, wherein the groove surrounds the upper surface over the entire circumference.

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