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Patent Issued for Liquid Crystal Composition, Liquid Crystal Display Using the Liquid Crystal Composition, and Method of Manufacturing the Liquid...

February 19, 2014



Patent Issued for Liquid Crystal Composition, Liquid Crystal Display Using the Liquid Crystal Composition, and Method of Manufacturing the Liquid Crystal Display

By a News Reporter-Staff News Editor at Journal of Engineering -- A patent by the inventors Lee, Ji-Hoon (Asan-si, KR); Oh, Sun-Kyoung (Asan-si, KR); Cho, Hee-Suck (Asan-si, KR); Kim, Kwang-Nyun (Asan-si, KR), filed on February 14, 2011, was published online on February 4, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8641923 is assigned to NDIS Corporation (KR).

The following quote was obtained by the news editors from the background information supplied by the inventors: "(a) Field of the Invention

"The present invention relates to a liquid crystal mixture, a liquid crystal display (LCD) using the liquid crystal mixture, and a method of manufacturing the same.

"(b) Description of the Related Art

"A liquid crystal display (LCD) is a flat panel display that is currently being widely used. The LCD includes a field generating electrode and a liquid crystal layer, and applies a voltage to the field generating electrode and thus produces an electric field in the liquid crystal layer. In this way, it determines the direction of liquid crystal molecules in the liquid crystal layer and adjusts transmittance of light passing through the liquid crystal layer.

"Since the liquid crystal has fluidity, it should secure stability against an external impact. Accordingly, a method of forming a polymer network in the liquid crystal layer to form a plurality of liquid crystal domains has been suggested.

"However, the liquid crystal domain regions and the polymer network regions are non-uniform in the panel, resulting in a non-uniform display characteristic over the panel."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "One aspect of the present invention provides a liquid crystal mixture improving uniformity of display characteristics.

"Another aspect of the present invention provides a liquid crystal display (LCD) using the liquid crystal mixture.

"Yet another aspect of the present invention provides a method of manufacturing the liquid crystal display (LCD).

"According to one embodiment of the present invention, a liquid crystal mixture is provided that includes the isotropic mixture of liquid crystal molecules and a photo-polymerizable monomer.

"The photo-polymerizable monomer may include a compound represented by the following Chemical Formula 1. R.sub.1-A-R.sub.2 [Chemical Formula 1]

"In Chemical Formula 1, A is a one-ring cyclic group selected from a C3 to C30 cycloalkyl group, a C6 to C30 bicycloalkyl group, and an C6 to C30 aryl group, and R.sub.1 and R.sub.2 are independently hydrogen, a substituted or unsubstituted (meth)acrylate group, a substituted or unsubstituted vinylether group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted thiol group, or a combination thereof.

"The A may include a cyclopentane, a cyclohexane, a cycloheptane, a cyclooctane, or a benzene ring.

"The liquid crystal molecules and the photo-polymerizable monomer may be included in amounts of about 50 to 90 wt % and about 10 to 50 wt % based on the total amount of the liquid crystal mixture, respectively.

"The liquid crystal mixture may further include a photoinitiator.

"The liquid crystal molecules, the photo-polymerizable monomer, and the photoinitiator may be included in amounts of about 50 to 90 wt %, about 10 to 45 wt %, and about 0.5 to 5 wt % based on the total amount of the liquid crystal mixture, respectively.

"According to another embodiment of the present invention, provided is a liquid crystal display (LCD) including a first display panel and a second display panel facing each other, and a liquid crystal layer disposed between the first and second display panels and including a plurality of liquid crystal regions and a plurality of polymer structures among the plurality of liquid crystal regions. The liquid crystal layer may be formed of the liquid crystal mixture of liquid crystal molecules and a photo-polymerizable monomer which exist isotropically.

"The photo-polymerizable monomer may include a compound represented by the Chemical Formula 1.

"According to still another embodiment of the present invention, provided is a method of manufacturing a liquid crystal display (LCD) which includes preparing a liquid crystal mixture including liquid crystal molecules and a photo-polymerizable monomer which exist isotropically, disposing the liquid crystal mixture between the first and second display panels, and radiating a light to the liquid crystal mixture to form a plurality of liquid crystal regions and a plurality of polymer structures.

"The photo-polymerizable monomer may include a compound represented by the Chemical Formula 1.

"The preparation of the liquid crystal mixture may further include a photoinitiator as well as the liquid crystal molecules and the photo-polymerizable monomer.

"The liquid crystal molecules and the photo-polymerizable monomer may be included in amounts of about 50 to 90 wt % and about 10 to 50 wt % based on the total amount of the liquid crystal mixture, respectively.

"Since the mixture of the liquid crystal molecules and the photo-polymerizable monomer exists isotropically regardless of temperature, the liquid crystal molecules and the photo-polymerizable monomer are not separated from each other and are uniformly dispersed. Accordingly, liquid crystal regions and polymer networks are uniformly dispersed over the liquid crystal layer after light radiation. Resultantly, a display may secure uniform characteristics. In addition, since the liquid crystal mixture maintains an isotropic state regardless of temperature, a liquid crystal display (LCD) can be manufactured at room temperature. Accordingly, this method may also be applied to a flexible display device."

URL and more information on this patent, see: Lee, Ji-Hoon; Oh, Sun-Kyoung; Cho, Hee-Suck; Kim, Kwang-Nyun. Liquid Crystal Composition, Liquid Crystal Display Using the Liquid Crystal Composition, and Method of Manufacturing the Liquid Crystal Display. U.S. Patent Number 8641923, filed February 14, 2011, and published online on February 4, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=94&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=4681&f=G&l=50&co1=AND&d=PTXT&s1=20140204.PD.&OS=ISD/20140204&RS=ISD/20140204

Keywords for this news article include: NDIS Corporation.

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Source: Journal of Engineering


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