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Patent Issued for Method of Forming Process Substrate Using Thin Glass Substrate and Method of Fabricating Flat Display Device Using the Same

August 27, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Lee, Jae-Won (Gyeonggi-Do, KR); Kim, Ki-Yong (Gyeonggi-Do, KR); Oh, Jae Young (Gyeonggi-Do, KR); An, Yong-Su (Gyeonggi-Do, KR); Kim, Sung-Ki (Gyeonggi-Do, KR); Hong, Gi-Sang (Gyeonggi-Do, KR); Lee, Jin-Bok (Gyeonggi-Do, KR); Won, Sang-Hyuk (Gyeonggi-Do, KR); Lee, Dong-Kyu (Jeollabuk-Do, KR), filed on April 30, 2012, was published online on August 12, 2014.

The patent's assignee for patent number 8802464 is LG Display Co., Ltd. (Seoul, KR).

News editors obtained the following quote from the background information supplied by the inventors: "The present disclosure relates to a method of forming a process substrate using a thin glass substrate, and a method of fabricating a liquid crystal display (LCD) device using the same.

"As all types of portable electronic devices such as a mobile phone, a PDA and a notebook computer develop, demands for a light, thin, short and small flat panel display (FDD) device increase. The FDD device includes an LCD (Liquid Crystal Display), a PDP (Plasma Display Panel), an FED (Field Emission Display), a VFD (Vacuum Fluorescent Display), etc. Among such FDD devices, the LCD device is being spotlighted due to massive production, easy driving, high picture quality and a large area.

"The LCD device is mainly applied to a portable electronic device. In order to enhance portability of the electronic device, the size and weight of the LCD device should be reduced. Moreover, since an LCD device of a large area is recently fabricated, demands for a light and thin configuration increase more.

"The size or the weight of the LCD device can be reduced in various manners. However, it is limited to reduce the number of main components of the LCD device. Moreover, it is difficult to reduce the entire size or weight of the LCD device by reducing the weights of the main components, since the weights of the main components are small."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Therefore, an aspect of the detailed description is to provide a method for fabricating a liquid crystal display (LCD) device capable of minimizing the entire weight of the LCD device and simplifying the fabrication processes, by using a light and thin glass substrate without performing an etching process with respect to the glass substrate.

"Another aspect of the detailed description is to provide a method for fabricating a liquid crystal display (LCD) device capable of preventing the occurrence of foreign materials or air foam between a glass substrate and an auxiliary substrate, by attaching the glass substrate to the auxiliary substrate in a vacuum state.

"To achieve these and other advantages and in accordance with the purpose of this specification, as embodied and broadly described herein, there is provided a method for fabricating a liquid crystal display device, the method comprising: providing a first substrate; forming a second process substrate by attaching a second substrate to a second auxiliary substrate in a vacuum state; forming a gate line, a data line, a thin film transistor and a pixel electrode on the first substrate; forming a color filter layer on the second substrate of the second process substrate; attaching the first substrate and the second process substrate to each other, thereby forming a liquid crystal panel; and separating the second auxiliary substrate from the liquid crystal panel.

"The forming a second process substrate may include: contacting the second substrate and the second auxiliary substrate with each other in a vacuum state; and forming an atmospheric state at the out region of the contacted second substrate and second auxiliary substrate to press the contacted second substrate and second auxiliary substrate by the atmospheric pressure in order to attach the second substrate and the second auxiliary substrate.

"To achieve these and other advantages and in accordance with the purpose of this specification, as embodied and broadly described herein, there is also provided a method for fabricating a process substrate, the method comprising: providing a substrate and an auxiliary substrate; contacting the substrate and the auxiliary substrate with each other in a vacuum state, thereby forming micro spaces of a vacuum state between the substrate and the auxiliary substrate; and increasing a pressure at the outside of the contacted substrate and auxiliary substrate to attach the substrate and the auxiliary substrate to each other by a pressure difference between the micro spaces and the outside of the contacted substrate and auxiliary substrate.

"The process substrate fabricated according to the present invention may comprise: a substrate; an auxiliary substrate contacting the substrate; and

"micro spaces formed on an entire interfacial surface between the substrate and the auxiliary substrate, wherein pressure within of the micro spaces are lower than atmospheric pressure outside the substrate and the auxiliary substrate.

"The substrate and the auxiliary substrate may be formed of glass, the substrate may have a thickness of 0.1 mm.about.0.4 mm, the auxiliary substrate may have a thickness of 0.3 mm or more than, and the substrate may have a roughness of 5.0 nm or less than.

"The present invention may have the following advantages.

"Firstly, a thin and light LCD device can be provided without requiring an additional panel etching process. This can prevent damages of the substrate due to weakened strength of the substrate, resulting from increased surface roughness of the liquid crystal panel by an etching process.

"Secondly, since the glass substrate and the auxiliary substrate are attached to each other in a vacuum state, foreign materials or air foam can be prevented from being introduced into space between the glass substrate and the auxiliary substrate.

"Thirdly, since the glass substrate and the auxiliary substrate are attached to each other by a uniform pressure, a wrap phenomenon can be prevented. The wrap phenomenon indicates the occurrence of bending of a substrate, resulting from a gap between corner regions or central regions of a glass substrate and an auxiliary substrate attached to each other.

"Further scope of applicability of the present application will become more apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from the detailed description."

For additional information on this patent, see: Lee, Jae-Won; Kim, Ki-Yong; Oh, Jae Young; An, Yong-Su; Kim, Sung-Ki; Hong, Gi-Sang; Lee, Jin-Bok; Won, Sang-Hyuk; Lee, Dong-Kyu. Method of Forming Process Substrate Using Thin Glass Substrate and Method of Fabricating Flat Display Device Using the Same. U.S. Patent Number 8802464, filed April 30, 2012, and published online on August 12, 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=8802464.PN.&OS=PN/8802464RS=PN/8802464

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

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Source: Journal of Engineering


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