Method for manufacturing liquid crystal display device
First Claim
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1. A method for manufacturing a liquid crystal display device, comprising:
- forming a continuous loop shaped seal pattern comprising a sealant over one of a pair of substrates;
dropping a plurality of droplets of smectic liquid crystal over one of the pair of substrates on which rubbing treatment is performed so that the plurality of droplets of the smectic liquid crystal is aligned in only one line parallel to a direction of the rubbing treatment; and
fixing the pair of substrates to each other with the sealant to sandwich the smectic liquid crystal,wherein the step of dropping the plurality of droplets of the smectic liquid crystal is performed on a dropping stage, the dropping stage being kept at a temperature higher than a temperature at which the smectic liquid crystal is in an isotropic phase so that the plurality of droplets of the smectic liquid crystal spread in the continuous loop shaped seal pattern, andwherein the spread plurality of droplets is in contact with four sides of the continuous loop shaped seal pattern.
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Abstract
To prevent alignment disorder of liquid crystal molecules, which is caused in manufacturing steps, and to manufacture a liquid crystal display device including a uniform liquid crystal layer in which liquid crystal molecules are aligned with high accuracy. In addition, to provide a technique for manufacturing a liquid crystal display device which is capable of fast response and high performance, and has high image quality with reduced display defects, with high yield. A method for manufacturing a liquid crystal display device, including dropping smectic liquid crystal by a dropping method in which a plurality of droplets of smectic liquid crystal are dropped to an alignment film so that the droplets are aligned in a line which is parallel to a rubbing direction of the alignment film which is formed in a region surrounded by a seal pattern of a sealant over a substrate.
26 Citations
20 Claims
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1. A method for manufacturing a liquid crystal display device, comprising:
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forming a continuous loop shaped seal pattern comprising a sealant over one of a pair of substrates; dropping a plurality of droplets of smectic liquid crystal over one of the pair of substrates on which rubbing treatment is performed so that the plurality of droplets of the smectic liquid crystal is aligned in only one line parallel to a direction of the rubbing treatment; and fixing the pair of substrates to each other with the sealant to sandwich the smectic liquid crystal, wherein the step of dropping the plurality of droplets of the smectic liquid crystal is performed on a dropping stage, the dropping stage being kept at a temperature higher than a temperature at which the smectic liquid crystal is in an isotropic phase so that the plurality of droplets of the smectic liquid crystal spread in the continuous loop shaped seal pattern, and wherein the spread plurality of droplets is in contact with four sides of the continuous loop shaped seal pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for manufacturing a liquid crystal display device, comprising:
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forming a continuous loop shaped seal pattern comprising a sealant over one of a pair of substrates; dropping a plurality of droplets of smectic liquid crystal over one of the pair of substrates on which rubbing treatment is performed so that the plurality of droplets of the smectic liquid crystal is partially overlapped with one another and aligned in only one line parallel to a direction of the rubbing treatment; and fixing the pair of substrates to each other with the sealant to sandwich the smectic liquid crystal, wherein the step of dropping the plurality of droplets of the smectic liquid crystal is performed on a dropping stage, the dropping stage being kept at a temperature higher than a temperature at which the smectic liquid crystal is in an isotropic phase so that the plurality of droplets of the smectic liquid crystal spread in the continuous loop shaped seal pattern, and wherein the spread plurality of droplets is in contact with four sides of the continuous loop shaped seal pattern. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsIshitani, Tetsuji, Nishi, Takeshi
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Primary Examiner(s)Aftergut, Jeff
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Assistant Examiner(s)Lee, Jaeyun
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Application NumberUS12/073,616Publication NumberTime in Patent Office2,090 DaysField of Search156/292, 349/187US Class Current156/292CPC Class CodesB32B 2038/0076 Curing, vulcanising, cross-...B32B 2309/02 TemperatureB32B 2309/04 TimeB32B 2310/0831 using UV radiationB32B 2310/0843 using laserB32B 2311/00 Metals, their alloys or the...B32B 2323/04 PolyethyleneB32B 2367/00 Polyesters, e.g. PET, i.e. ...B32B 2457/202 LCD, i.e. liquid crystal di...B32B 37/24 with at least one layer not...B32B 38/145 PrintingG02F 1/1339 Gaskets; Spacers; Sealing o...G02F 1/1341 Filling or closing of cellsG02F 1/13415 Drop filling processG02F 1/13454 Drivers integrated on the a...G02F 1/136277 formed on a semiconductor s...G02F 1/1368 in which the switching elem...G02F 1/141 using ferroelectric liquid ...
