Akron Polymer Systems, Inc.

Brian Michael King

Thauming Kuo

Frank Wayne Harris

Dong Zhang

Ted Germroth

Jiaokai Jing

Xiaoliang Joe Zheng

Qifeng Zhou

Zhikuan Lu

Ted Calvin Germroth

Xiaoling Joe Zheng

Jiaokai Alexander Jing

A multilayer optical retardation compensation film having at least one positive C-plate and at least one negative C-plate is used in an LCD device. The multilayer film may have a substantially flat wavelength dispersion curve, or the multilayer film combined with other layers in the LCD device may have a substantially flat wavelength dispersion curve. Polymer films for the positive C-plate may be identified according to their absorbance maxima at certain wavelength ranges.

Liquid crystal display having improved wavelength dispersion characteristics

An optical compensation film composition is disclosed herein wherein the optical compensation film is stretched to yield a negative A-plate having a refractive index profile of n&#x3c;n=n. or a biaxial polymer film having a refractive index profile of n&#x3c;n&#x3c;n, the film having been stretched from a film cast from a polymer solution comprising a solvent and a polymer having a moiety of wherein R, R, and Rare each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R, R, and Ris a fluorine atom, and wherein R is hydrogen or a substituent on the styrenic ring.

Optical compensation films based on fluoropolymers

Optical compensation films (positive C-plate) with mesogen anisotropic subunits (OASUs) that have high positive birefringence throughout the wavelength range 400 nm&#x3c;&#x3bb;&#x3c;800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

Optical compensation films with mesogen groups for liquid crystal display

The present invention provides uniaxially stretched polymer films that have a refractive index profile suitable for use as negative A-plates or biaxial birefringent plates in a liquid crystal display (LCD) device. These wave plates can be used to compensate for the phase retardations existing in various modes of LCDs including TN (twisted nematic), VA (vertically aligned), IPS (in-plane switching), and OCB (optically compensated bend), and therefore improving the viewing quality of the displays.

Optical compensation films based on stretched polymer films

An optical compensation film composition is disclosed herein having a polymer film and a substrate, wherein the polymer film has a positive birefringence greater than 0.005 throughout the wavelength range of 400 nm&#x3c;&#x3bb;&#x3c;800 nm, the film having been cast from a polymer solution comprising a solvent and a polymer having a moiety of wherein R, R, and Rare each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R, R, and Ris a fluorine atom, and wherein R is hydrogen or a substituent on the styrenic ring.

Some embodiments include compositions and/or methods related to optical compensation films. More particularly, some embodiments can include brominated polystyrene compositions, and/or methods for their preparation, suitable for forming optical compensation films. In some embodiments, suitable brominated polystyrene compositions, and/or methods for their preparation, can include aromatic rings having one or more acyl moieties.

Optical compensation films of brominated styrenic polymers and related methods

Optical compensation films (positive C-plate) with disk anisotropic subunits (OASUs) that have high positive birefringence throughout the wavelength range 400 nm&#x3c;&#x3bb;&#x3c;800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

Optical compensation films with disk groups for liquid crystal display

Optical compensation films (positive C-plate) with anisotropic subunits (OASUs) that are aromatic rings substituted with birefringence enhancing substituents (BES) and have high positive birefringence throughout the wavelength range 400 nm&#x3c;&#x3bb;&#x3c;800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

Optical compensation films with birefringence enhancing substituents for liquid crystal display

A method for controlling positive birefringence in an optical compensation film (positive C-plate) having high positive birefringence throughout the wavelength range 400 nm&#x3c;&#x3bb;&#x3c;800 nm is provided. The method includes selecting polymers with optically anisotropic subunits (OASUs) that exhibit the buttressing effect, wherein the OASUs may be disks, mesogens or aromatic rings substituted with birefringence enhancing substituents. The method further includes processing the polymer by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. These optical compensation films may be used in LCDs, particularly IPS-LCDs.

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Jonesborough, TN, United States of America

Brian Michael King