Liquid crystal display device and method for fabricating the same

• US 5,729,319 A
• Filed: 04/01/1996
• Issued: 03/17/1998
• Est. Priority Date: 04/04/1995
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Shiomi, Makoto, Shirai, Yoshihiro, Inou, Ippei
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US08/625,885
• Time in Patent Office: 715 Days
• Field of Search: 349/86, 349/12, 349/87, 349/188, 349/92, 349/93, 349/155, 349/158, 349/183, 349/187, 349/189, 428/1, 430/20
• US Class Current: 349/156
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence

Abstract

A liquid crystal display device includes a pair of substrates opposed to each other, polymeric walls patterned in a predetermined pattern, and a liquid crystal layer at least a part of which is surrounded by the polymeric wall, and the polymeric wall and the liquid crystal layer are interposed between the substrates, wherein the polymeric wall has a predetermined rotatory polarization corresponding to an alignment regulating force of the substrates.

Claims

1. A liquid crystal display device comprising a pair of substrates opposed to each other, polymeric walls patterned in a predetermined pattern, and a liquid crystal layer at least a part of which is surrounded by the polymeric walls, the polymeric walls and the liquid crystal layer being interposed between the substrates, wherein the polymeric walls have a predetermined rotatory polarization corresponding to an alignment regulating force of the substrates, and

wherein a rotatory polarization monomer forming the polymeric walls comprises an alignment regulating portion and a polymerizable portion located on at least one end of the alignment regulating portion.

2. A liquid crystal display device according to claim 1, wherein a compound forming the alignment regulating portion is at least one of the compounds selected from the group consisting of cyclopentane, cyclohexane, pyrrole, pyridine, benzene, biphenyl, terphenyl, phenylcyclohexane, anilide benzoate, N-cyclohexylbenzoamide, N-chclohexyl cyclohexanecarboxamide, phenyl benzoate, and phenyl ether.

3. A liquid crystal display device according to claim 1, wherein the polymerizable portion is selected from the group consisting of a vinyl group, a methacrylic group, and an acrylic group.

4. A liquid crystal display device according to claim 1, wherein a compound forming the alignment regulating portion is at least one of the compounds selected from the group consisting of cyclopentane, cyclohexane, pyrrole, pyridine, benzene, biphenyl, terphenyl, phenylcyclohexane, anilide benzoate, N-cyclohexylbenzoamide, N-cyclohexylcyclohexane, phenyl benzoate, and phenyl ether;

and the polymerizable portion is selected from the group consisting of a vinyl group, a methacrylic group, and an acrylic group.

5. A liquid crystal display device according to claim 1, wherein the rotatory polarization monomer further comprises a spacer portion between the alignment regulating portion and the polymerizable portion.

6. A liquid crystal display device according to claim 1, wherein a mixture of a liquid crystal material forming the liquid crystal layer and the rotatory polarization monomer has a content of the liquid crystal material equal to an opening ratio of the liquid crystal display device.

7. A liquid crystal display device according to claim 1, wherein a rotatory polarization of the polymeric walls is larger than zero and is equal to or smaller than π

/2(rad).

8. A liquid crystal display device according to claim 1, further comprising a pressure-sensing type input device.

9. A method for fabricating a liquid crystal display device comprising a pair of substrates opposed to each other, polymeric walls patterned in a predetermined pattern, and a liquid crystal layer at least a part of which is surrounded by the polymeric walls, the polymeric walls and the liquid crystal layer being interposed between the substrates, the method comprising the steps of:

injecting a mixture of a rotatory polarization monomer forming polymeric walls and a liquid crystal material forming a liquid crystal layer between the attached substrates so as to obtain a liquid crystal cell; and

selectively irradiating a predetermined portion of the liquid crystal cell with ultraviolet rays at a temperature at which the liquid crystal material exhibits an isotropic phase and an alignment regulating portion of the rotatory polarization monomer is subjected to an alignment regulation of the substrate, thereby polymerizing the rotatory polarization monomer in the predetermined portion so as to form the polymeric walls, and to form a liquid crystal layer in a non-irradiated portion.

10. A method for fabricating a liquid crystal display device according to claim 9, wherein the irradiated portion corresponds to the non-pixel portion.

11. A method for fabricating a liquid crystal display device according to claim 9, wherein the means for selectively irradiating ultraviolet rays is a method using a photomask.

12. A method for fabricating a liquid crystal display device according to claim 9, wherein the means for selectively irradiating ultraviolet rays is a self-alignment method.

13. A method for fabricating a liquid crystal display device according to claim 9, further comprising the steps of cooling the liquid crystal cell to room temperature after irradiation and irradiating the liquid crystal cell again with ultraviolet rays at room temperature.