Konica Corporation

Konica-Minolta Holdings, Inc.

Konica Minolta Opto, Inc.

Konica Corporation, a Corporation of Japan

Takatoshi Yajima

Noriyasu Kuzuhara

Hiroki Umeda

Koji Tasaka

Nobuo Kubo

Makoto Honda

Sota Kawakami

Toshiaki Shibue

Hideyuki Kobayashi

Hiromitsu Araki

Hiroshi Naito

Tetsutaro Hashimura

Kenji Nakanishi

Yoshioki Okubo

Nobuyuki Takiyama

Eiichi Ueda

Masahito Takada

Yoshioki Ohkubo

The method to produce the vertical alignment type liquid crystal display employs

Method for producing vertical alignment liquid crystal display

Disclosed is an optically anisotropic film used for a liquid crystal display of a vertical alignment liquid crystal mode comprising a fatty acid cellulose aster film, a retardation value (Rt value) in the thickness direction of the fatty acid cellulose ester film is from 60 to 300 nm, and the number of luminescent points having a size exceeding 50 &#x3bc;m is zero per 250 mm, and the number of luminescent points having a size of 5 to 50 &#x3bc;m is 200 or less per 250 mmwhen the fatty acid cellulose ester film is observed with two polarizing plates being provided on both surfaces of the fatty acid cellulose ester film so as to shield transmission light.

Optical film and liquid crystal display using the same

A rolled optical film includes a cellulose ester film which has a width of from 1 m to 3 m and a length of 500 m or more and is shaped in a rolled film. The cellulose ester film includes streaks from 1 line to 20 lines per 10 mm in a lateral direction thereof in which the streaks have a height of from 50 nm to 300 nm, an inclination of from 50 nm/mm to 300 nm/mm and a continuous length of 50 cm or more in a longitudinal direction thereof and the cellulose ester film does no includes a streak which has a height of 300 nm or more, an inclination of 300 nm/mm or more and a continuous length of 50 cm or more in a longitudinal direction thereof.

Rolled optical film

A manufacturing method of a cellulose ester film satisfying the relationships, Nx&#x3e;Ny&#x3e;Nz, and 0.8&#x2266;R/R&#x2266;3.5, the method comprising casting a cellulose ester dope containing a solvent of a good solvent and a poor solvent on a support to form a web; peeling the web from the support; transporting the peeled web (step D); holding the edges in the transverse direction of the web (step A); stretching the resulting web in the transverse direction while applying a tension; reducing the tension in the transverse direction of the web; and drying the stretched web, wherein the residual solvent content of the web is 5 to 90% by weight at the beginning in the step A, and the residual poor solvent content in the residual solvent content of the web is from 15 to 95% by weight at the terminal point in the Step D

Cellulose ester film, its manufacturing method, optical retardation film, optical compensation sheet, elliptic polarizing plate, and image display

A polarizing plate used in a vertical alignment mode liquid crystal display comprising a liquid crystal cell is disclosed, wherein the polarizing plate comprises a polarizing film and a mixed fatty acid cellulose ester film with optical biaxiality provided between the polarizing film and the liquid crystal cell, and wherein the mixed fatty acid cellulose ester film has a retardation in plane R0 of from 31 to 120 nm, and a retardation in the thickness direction Rt of from 60 to 300 nm, in which R0 is represented by the following formula (1) and Rt is represented by the following formula (2):0=()&#xd7;&#x2003;&#x2003;formula (1)={()/2&#x2212;&#x2003;&#x2003;formula (2)

Polarizing plate and liquid crystal display employing the same

An optically anisotropic film is disclosed. The film comprises a fatty acid cellulose ester film support having an acetyl group and a propionyl group, and a liquid crystal layer containing a liquid crystal compound, or a resin layer containing polyimide, polyamidoimide, polyamide, polyether imide, polyether ether ketone, polyether ketone, polyketone sulfide, polyether sulfone, polysulfone, polyphenylene sulfide, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyacetal, polycarbonate, polyallylate, acrylic resin, polyvinyl alcohol, polypropylene, cellulose based plastics, epoxy resin, or phenol resin.

An optical compensation film wherein: (i) molecules of a liquid crystalline compound are oriented in a manner that an average tilt angle of the compounds is not more than 4 degrees; (ii) the orientation is fixed; (iii) Ro(&#x3bb;) values are: at wavelength 589 nm: 40-130 nm; at 600 nm: 35-125 nm; and at 630 nm: 35-120 nm; (iv) Rt(&#x3bb;) value are 120-400 400 nm in &#x3bb; range of 500-630 nm; and (v) Values of Ro(589), Ro(600) and Ro(630) satisfy the following formulae:1.0&#x3c;&#x3c;7.0=((589)&#x2212;(630))/((600)&#x2212;(630)).

Optical compensation film, polarizing plate and liquid crystal display

A manufacturing method of a cellulose ester film satisfying the relationships, Nx&#x3e;Ny&#x3e;Nz, and 0.8&#x2266;R/R&#x2266;3.5, the method comprising casting a cellulose ester dope containing a solvent of a good solvent and a poor solvent on a support to form a web; peeling the web from the support; transporting the peeled web (step D0); holding the edges in the transverse direction of the web (step A); stretching the resulting web in the transverse direction while applying a tension; reducing the tension in the transverse direction of the web; and drying the stretched web, wherein the residual solvent content of the web is 5 to 90% by weight at the beginning in the step A, and the residual poor solvent content in the residual solvent content of the web is from 15 to 95% by weight at the terminal point in the Step D0.

A film for a liquid crystal display comprising a fatty acid cellulose ester film having an acetyl group and a propionyl group is disclosed. Sum of degree of acetyl substitution (DSac) and degree of propionyl substitution (DSpr) of the fatty acid cellulose ester film of the film is 2.8 or less, and a retardation value (Rt value) in the thickness direction define by Formula 1 is 60 to 300 nm.

An optical compensation film used for a liquid crystal display comprising a support and an optically anisotropic layer is disclosed. The optically anisotropic layer is a layer on which orientation of the liquid crystalline compound is fixed and the support is an optically biaxial cellulose ester film. A polarizing plate used for a liquid crystal display and a liquid crystal display employing the optical compensation film are also disclosed.

Optical compensation sheet and liquid crystal display

A polarizing plate used in a vertical alignment mode liquid crystal display comprising a liquid crystal cell is disclosed, wherein the polarizing plate comprises a polarizing film and a mixed fatty acid cellulose ester film with optical biaxiality provided between the polarizing film and the liquid crystal cell, and wherein the mixed fatty acid cellulose ester film has a retardation in plane Rof from 31 to 120 nm, and a retardation in the thickness direction Rt of from 60 to 300 nm, in which Ris represented by the following formula (1) and Rt is represented by the following formula (2):0=()&#xd7;&#x2003;&#x2003;formula (1)={()/2&#x2212;.&#x2003;&#x2003;formula (2)

Polarizing plate having cellulose ester films on opposite sides thereof and liquid crystal display employing the same

An optical compensation film comprising a cellulose ester film is disclosed. In the film, (a) each of photoelastic coefficient C(md) in a mechanical direction and photoelastic coefficient C(td) in the transverse direction of the cellulose ester film is 1&#xd7;10to 1&#xd7;10Paand C(md)&#x3c;C(td), (b) retardation Rwithin the plane of the cellulose film defined by Formula (I) is 20 to 70 nm, (c) retardation Rof the cellulose ester film in a thickness direction, defined by Formula (II) is 70 to 400 nm, and (d) both of a dimensional variation ratio S(md) in the mechanical direction and a dimensional variation ratio S(td) in the transverse direction of the cellulose ester film prior to and after being allowed to stand at ambient conditions of 80&#xb0; C. and 90 percent relative humidity for 50 hours are &#x2212;1 to 1 percent, |S(md)|&#x3e;|S(td)|, and C(td)&#xd7;|S(td)|&#x3c;C(md)&#xd7;|S(md)|.

Optical compensation film, viewing angle compensation integral type polarizing plate and liquid crystal display apparatus

A polarizing plate used in a vertical alignment mode liquid crystal display comprising a liquid crystal cell is disclosed, wherein the polarizing plate comprises a polarizing film and a mixed fatty acid cellulose ester film with optical biaxiality provided between the polarizing film and the liquid crystal cell, and wherein the mixed fatty acid cellulose ester film has a retardation in plane Rof from 31 to 120 nm, and a retardation in the thickness direction Rt of from 60 to 300 nm, in which Ris represented by the following formula (1) and Rt is represented by the following formula (2):0=()&#x2003;&#x2003;formula (1)={()/2&#x2212;&#x2003;&#x2003;formula (2)

Polarizing plate having a stretched film on a side thereof and liquid crystal display employing the same

An optical compensation film comprising a cellulose ester film is disclosed. In the film, (a) each of photoelastic coefficient C(md) in a mechanical direction and photoelastic coefficient C(td) in the transverse direction of the cellulose ester film is 1&#xd7;10to 1&#xd7;10Paand C(md)&#x3c;C(td), (b) retardation Rwithin the plane of the cellulose film defined by Formula (I) is 20 to 70 nm, (c) retardation Rof the cellulose ester film in a thickness direction, defined by Formula (II) is 70 to 400 nm, and (d) both of a dimensional variation ratio S(md) in the mechanical direction and a dimensional variation ratio S(td) in the transverse direction of the cellulose ester film prior to and after being allowed to stand at ambient conditions of 80&#xb0; C. and 90 percent relative humidity for 50 hours are &#x2212;1 to 1 percent, and |S(md)|&#x3e;|S(td)|.

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Hino, Japan

Takatoshi Yajima