News Column

Patent Issued for Alignment Layer, Liquid Crystal Display Device, and Method of Fabricating the Same

August 22, 2014



By a News Reporter-Staff News Editor at Entertainment Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventor Kim, Dong-Guk (Goyang, KR), filed on December 8, 2010, was published online on August 5, 2014.

The assignee for this patent, patent number 8793858, is LG Display Co., Ltd. (Seoul, KR).

Reporters obtained the following quote from the background information supplied by the inventors: "The present disclosure relates to a method of fabricating an alignment layer, and particularly, to a method of fabricating an alignment layer capable of alignment-processing an alignment layer by irradiating ultraviolet (UV) light onto reactive mesogens of the alignment layer.

"A liquid crystal display (LCD) device is a transmissive flat panel display device, and is mainly applied to a portable electronic device such as a notebook computer, personal digital assistants (PDA), and mobile phones. Recently, the LCD device has also been applied to a high-definition television (HDTV), a digital television, and a wall-mounted thin television. In addition to LCD devices, many kinds of devices including a plasma display panel (PDP) are being actively developed as flat panel display devices. However, the LCD device is being spotlighted the most among the flat panel display devices owing to massive production and easy driving characteristics, a high picture quality, etc.

"In order to implement a uniform brightness and a high contrast ratio of the LCD device, injected LC molecules have to be aligned in a constant direction. The most representative method of aligning LC molecules is an aligning method by rubbing. According to this aligning method by rubbing, polyimide is deposited on a substrate as an alignment layer, and then a rubbing process is performed, thereby forming uniform micro grooves on the surface of the alignment layer. The micro grooves, polyimide molecules aligned by the rubbing process, and LC molecules undergo an intermolecular interaction on the surface of the alignment layer, thereby uniformly aligning the LC molecules on the entire surface of the alignment layer. However, in the aligning method by rubbing, random phase distortion and light scattering occur due to defects of the micro grooves formed on the surface of the alignment layer. This may lower a function of the LCD device. Furthermore, dust and a static electricity occur on the alignment layer by the rubbing process. This may degrade a production yield and damage the substrate."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "A method of fabricating an alignment layer comprises: depositing an alignment material on a substrate, the alignment material including reactive mesogens and a photoinitiator, the reactive mesogen having a mesogen, flexible spacers at ends of the mesogen, and photo-reactive end groups formed at ends of the flexible spacers; applying an electric field to the alignment material in a predetermined direction; and applying UV light to the alignment material applied by the electric field applied thereto to polymerize the photo-reactive end groups with each other.

"There is also disclosed a method of fabricating a liquid crystal display (LCD) device, the method comprising: providing a first substrate including a plurality of pixels defined by a plurality of gate lines and data lines and thin film transistors (TFTs) arranged at each pixels; forming a first alignment layer on the first substrate; alignment-processing the first alignment layer; providing a second substrate having a color filter layer and a black matrix thereon; forming a second alignment layer on the second substrate; alignment-processing the second alignment layer; and attaching the first and second substrates to each other, wherein at least one of the first and second alignment layers is formed of an alignment material including reactive mesogens and a photoinitiator, the reactive mesogens having a mesogen, flexible spacers at ends of the mesogen, and photo-reactive end groups at ends of the flexible spacers, and at least one of the first and second alignment layers is aligned by irradiating UV light in a state that an electric field has been applied the corresponding alignment layer in a predetermined direction.

"The present invention may have the following advantages.

"The alignment layer is formed of reactive mesogens, and is alignment-processed by being irradiated with UV light in a state that an electric field has been applied thereto. This may prevent the conventional problems such as damage of the alignment layer due to a rubbing process, or random phase distortion and light scattering due to defects of micro grooves.

"The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings."

For more information, see this patent: Kim, Dong-Guk. Alignment Layer, Liquid Crystal Display Device, and Method of Fabricating the Same. U.S. Patent Number 8793858, filed December 8, 2010, and published online on August 5, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8793858.PN.&OS=PN/8793858RS=PN/8793858

Keywords for this news article include: Television, LG Display Co. Ltd..

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Entertainment Newsweekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters