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Researchers Submit Patent Application, "Color Filter Substrate, Liquid Crystal Display Device Including Color Filter Substrate, and Method of...

February 27, 2014



Researchers Submit Patent Application, "Color Filter Substrate, Liquid Crystal Display Device Including Color Filter Substrate, and Method of Fabricating Color Filter Substrate", for Approval

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Yi, Young-Dae (Yongin-City, KR); Kim, Dong-Gyu (Yongin-City, KR), filed on November 19, 2012, was made available online on February 13, 2014.

The patent's assignee is Samsung Display Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a color filter substrate, a liquid crystal display device including the color filter substrate, and a method of fabricating the color filter substrate.

"Flat panel displays are image display devices, such as a liquid crystal display device, an organic light-emitting display device, and an electrophoretic display device. In particular, the liquid crystal display device is most widely used. The liquid crystal display device includes two substrates, each having an electrode formed thereon, and a liquid crystal layer interposed between the two substrates. In the liquid crystal display device, a voltage is applied across the electrodes formed on the respective substrates to rearrange liquid crystal molecules of the liquid crystal layer, and thus an amount of light passing through the liquid crystal layer is adjusted.

"Upper and lower substrates of the liquid crystal display device are coupled to each other by a sealing material that is formed along the edges of the upper and lower substrates to trap liquid crystals. The upper and lower substrates are supported by a plurality of column spacers formed in a predetermined pattern between the upper and lower substrates to maintain a predetermined cell gap therebetween.

"In the case that heights of the plurality of column spacers for maintaining the predetermined cell gap between the upper and lower substrates are equal, when the liquid crystal display device is exposed in a high-temperature environment, the liquid crystal layer expands, thereby deteriorating reliability of maintenance of the cell gap."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The present invention provides a liquid crystal display device including double column spacers, that is, amain column spacer and a sub-column spacer having respectively different heights.

"The present invention also provides a method of forming a double column spacer by using a single column spacer mask.

"According to an aspect of the present invention, there is provided a color filter substrate including: a first black matrix not having an opening and a second black matrix having an opening, wherein the first black matrix and the second black matrix are formed on a substrate; an auxiliary pattern disposed in the opening; a color filter covering the first and second black matrixes and formed in each of pixels; an overcoat layer formed on the color filter; a first column spacer formed on the overcoat layer so as to correspond to the first black matrix; and a second column spacer formed above the auxiliary pattern so as to correspond to the second black matrix.

"The auxiliary pattern is a part of the color filter.

"The color filter for forming the auxiliary pattern is a blue color filter.

"Heights of the first and second black matrixes are greater than a height of the auxiliary pattern.

"The heights of the first and second black matrixes are less than a height of the auxiliary pattern.

"The first column spacer and the second column spacer have the same height, and a step height is formed between the first column spacer and the second column spacer.

"The color filter substrate may further include a common electrode formed on the overcoat layer.

"According to another aspect of the present invention, there is provided a liquid crystal display device, including: a first substrate; a first black matrix formed on the first substrate and not having an opening; a second black matrix formed on the first substrate and having an opening; an auxiliary pattern disposed in the opening; a color filter covering the first and second black matrixes and formed in each of a plurality of pixels; an overcoat layer formed on the color filter; a first column spacer formed on the overcoat layer so as to correspond to the first black matrix; a second column spacer formed above the auxiliary pattern so as to correspond to the second black matrix; a second substrate; a thin film transistor (TFT) formed in a light blocking region on the second substrate; and a pixel electrode electrically connected to the TFT.

"The auxiliary pattern may be a part of the color filter.

"The color filter for forming the auxiliary pattern may be a blue color filter.

"Heights of the first and second black matrixes may be greater than a height of the auxiliary pattern.

"The heights of the first and second black matrixes may be less than a height of the auxiliary pattern.

"The first column spacer and the second column spacer may have the same height, and a step height may be formed between the first column spacer and the second column spacer.

"The first substrate may further include a common electrode formed on the overcoat layer.

"According to another aspect of the present invention, there is provided a method of manufacturing a color filter substrate, the method including: forming a first black matrix not having an opening and a second black matrix having an opening; forming a color filter on the first black matrix; and the second black matrix; disposing an auxiliary pattern in the opening; forming an overcoat layer on the color filter and the auxiliary pattern; forming a first column spacer in a region where the first black matrix is formed on the overcoat layer; and forming a second column spacer in a region where the second black matrix is formed on the overcoat layer.

"The auxiliary pattern may be formed as a part of the color filter.

"The color filter for forming the auxiliary pattern may be a blue color filter.

"Heights of the first and second black matrixes may be greater than a height of the auxiliary pattern.

"The heights of the first and second black matrixes may be less than a height of the auxiliary pattern.

"The method may further include forming a common electrode on the overcoat layer.

BRIEF DESCRIPTION OF THE DRAWINGS

"A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which like reference symbols indicate the same or similar components, wherein:

"FIG. 1 is a schematic plan view of a liquid crystal display device according to an embodiment of the present invention;

"FIG. 2 is a cross-sectional view taken along line I-I' of FIG. 1;

"FIGS. 3 to 6 are schematic cross-sectional views for describing a process of manufacturing a color filter substrate of FIG. 2;

"FIG. 7 is a schematic plan view of a liquid crystal display device according to another embodiment of the present invention;

"FIG. 8 is a cross-sectional view taken along line II-IP of FIG. 7; and

"FIGS. 9 to 12 are schematic cross-sectional views for describing a process of manufacturing a color filter substrate of FIG. 8."

For additional information on this patent application, see: Yi, Young-Dae; Kim, Dong-Gyu. Color Filter Substrate, Liquid Crystal Display Device Including Color Filter Substrate, and Method of Fabricating Color Filter Substrate. Filed November 19, 2012 and posted February 13, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4902&p=99&f=G&l=50&d=PG01&S1=20140206.PD.&OS=PD/20140206&RS=PD/20140206

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

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Source: Politics & Government Week


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