Liquid crystal display device with acrylic polymer spacers and method of manufacturing the same
AssigneeKabushiki Kaisha Toshiba
InventorsRei Hasegawa, Miki Mori
Life of this patent
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Abstract
The columnar spacer included in a liquid crystal display device is formed of a photosensitive resin selected from the group consisting of acrylic polymers and acrylic copolymers, said photosensitive resin having at least one atomic group selected from the group consisting of an epoxy group, an imide bond, an ether bond, an ester bond and an urethane bond. The particular photosensitive resin used for forming the columnar spacers permits the surface of a polyimide alignment film to be prevented from being swollen by or dissolved in a developing solution in the subsequent step so as to maintain the crystal orientation satisfactorily.
Claims20
A method of manufacturing a liquid crystal display device comprising the steps of:
- forming a film consisting essentially of polyimide on a first substrate having an electrode in a pixel region;
- applying an alignment treatment to said polyimide film;
- coating the alignment polyimide film with substantially one photosensitive resin selected from the group consisting of acrylic polymers and acrylic copolymers to form a photosensitive resin film, said photosensitive resin having at least one side chain selected from the group consisting of an epoxy group, an imide bond, an ether bond, an ester bond and an urethane bond;
- exposing said photosensitive resin film to light;
- developing with a developing agent having a solubility parameter not more than 9.8 cal.sup.1/2.cm.sup.-3/2 or not less than 12.7 cal.sup.1/2.cm.sup.-3/2 to form columnar spacing means made of said photosensitive resin;
- and
- forming a liquid crystal display element by using said first substrate having the spacing means formed thereon, a second substrate having an electrode and an alignment film formed thereon, said alignment film consisting essentially of polyimide, and a liquid crystal material.
A liquid crystal display device, comprising:
- first and second substrates facing each other;
- means for spacing said first and second substrates, said spacing means being columnar and made of a photosensitive resin selected from the group consisting of acrylic polymers and acrylic copolymers, and said photosensitive resin having at least one side chain selected from the group consisting of an epoxy group, an imide bond, an ether bond, and ester bond and a urethane bond;
- a light transmission control layer positioned in a space between said first and second substrates held apart from each other by said spacing means;
- and
- control means for controlling said light transmission control layer so as to turn light on or off,
- wherein said acrylic polymer is a polymer of at least one monomer selected from the group consisting of monomethoxy 1,6-hexanediol monoacrylate, monomethoxy tripropyleneglycol monoacrylate, monomethoxy neobenzylglycol alkoxyl monoacrylate, monomethoxy trimethylolpropane alkoxy diacrylate, and cardoepoxyacrylate.
A liquid crystal display device, comprising:
- first and second substrates facing each other, said first substrate having an electrode in a pixel region and an alignment film consisting essentially of polyimide formed on said first substrate in order;
- means for spacing said first and second substrate, said spacing means being columnar and produced by the steps of:
- coating a photosensitive resin selected from the group consisting of acrylic polymers and acrylic copolymers to form a photosensitive resin film, said photosensitive resin having at least one side chain selected from the group consisting of an epoxy group, an imide bond, an ether bond, an ester bond and an urethane bond;
- exposing said photosensitive resin film to light;
- developing with a developing agent having a solubility parameter not more than 9.8 cal.sup.1/2.cm.sup.-3/2 or not less than 12.7 cal.sup.1/2.cm.sup.-3/2 ;
- a light transmission control layer positioned in a space between said first and second substrates held apart from each other by said spacing means;
- and
- control means for controlling said light transmission control layer so as to turn light on or off.
Dependencies are inferred from the claim text.