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Researchers Submit Patent Application, "Thin Film Transistor Substrate and Liquid Crystal Display Including the Thin Film Transistor Substrate", for...

July 24, 2014



Researchers Submit Patent Application, "Thin Film Transistor Substrate and Liquid Crystal Display Including the Thin Film Transistor 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 RO, Sungin (Hwaseong-si, KR); PARK, Seunghyun (Seoul, KR); OH, Dong Gun (Osan-si, KR), filed on May 2, 2013, was made available online on July 10, 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 thin film transistor substrate and a liquid crystal display that includes the thin film transistor substrate.

"In general, a liquid crystal display includes a display panel for displaying an image and a backlight unit for supplying light to the display panel. The display panel includes a thin film transistor substrate in which pixels are arranged in a matrix form, a color filter substrate overlapping the thin film transistor substrate, and a liquid crystal layer interposed between the thin film transistor substrate and the color filter substrate.

"The thin film transistor substrate includes gate lines, data lines insulated from the gate lines and crossing the gate lines, and thin film transistors each being connected to a corresponding gate line of the gate lines and a corresponding data line of the data lines. Each pixel may receive a pixel voltage through a corresponding thin film transistor of the thin film transistors. An arrangement of liquid crystal molecules of the liquid crystal layer may be changed in accordance with the pixel voltage, and a transmittance of the light transmitted through the liquid crystal layer may change according to the arrangement of the liquid crystal molecules, thereby displaying a desired image.

"Various inspections are required to detect defects when the display panel is manufactured. For example, the inspections may include an open/short test and a visual inspection.

"The open/short test is applied to detect opens and shorts on the data lines formed on the thin film transistor substrate. For each data line of the data lines, the open/short test is performed by applying a test signal to one end of the data line and detecting the test signal from the other end of the data line. If a data line is open, the open data line is welded to a repair line. A data voltage (or data signal) is transmitted through the repair line to at least a portion of the open data line.

"The visual inspection is performed by applying an inspection signal having a constant voltage level to the gate lines and the data lines, which are connected to the pixels of the thin film transistor substrate, and observing a resistance image (or resistance profile)."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Embodiments of the present invention may be related to a thin film transistor substrate with an effectively utilized non-display area.

"Embodiments of the present invention may be related to a liquid crystal display having the thin film transistor substrate.

"One or more embodiments of the invention may be related to a thin film transistor substrate including a display area that includes the following elements: a plurality of pixels connected to gate lines and data lines crossing the gate lines, a non-display area disposed adjacent to the display area, a plurality of data pads disposed in the non-display area and each being connected to a first end of a corresponding data line of the data lines, a plurality of first transistors disposed in the non-display area and each being connected to a second end of the corresponding data line of the data lines, a plurality of OS pads connected to the second end of the data lines, and a plurality of repair lines disposed in the non-display area along a vicinity of the display area and arranged while interposing the first transistors therebetween. The OS pads overlap the first transistors and the repair lines.

"The non-display area includes a first non-display area disposed adjacent to a lower side of the display area and including the data pads disposed therein, a second non-display area disposed adjacent to an upper side of the display area and including the OS pads and the first transistors disposed therein, a third non-display area disposed adjacent to a right side of the display area, and a fourth non-display area disposed adjacent to a left side of the display area.

"The data lines include first data lines corresponding to odd-numbered data lines of the data lines and second data lines corresponding to even-numbered data lines of the data lines, and the second data lines extend longer than the first data lines in the second non-display area.

"The repair line includes a first repair line and a second repair line disposed at a position outer than the first repair line, and the first transistors are disposed between the first repair line and the second repair line.

"The thin film transistor substrate further includes a first test gate line disposed between the first and second repair lines in the second non-display area to be connected to the first transistors, a first switching pad connected to the first test gate line, and a plurality of first test pads connected to the first transistors. The first transistors are divided into first groups respectively corresponding to the first test pads, and the first transistors arranged in the same first group are commonly connected to a corresponding first test pad of the first test pads.

"Each of the first transistors includes a gate electrode connected to the first test gate line, a drain electrode connected to the corresponding data line, and a source electrode connected to the corresponding first test pad, and the source electrodes of the first transistors arranged in the same first group are commonly connected to the corresponding first test pad.

"The first data lines overlap the first test gate line and the first repair line and the second data lines overlap the first repair line, the first test gate line, and the second repair line.

"The OS pads connected to the second end of the first data lines overlap the first repair line and the first test gate line, and the OS pads connected to the second end of the second data lines overlap the first test gate line and the second repair line.

"The thin film transistor substrate further includes a gate driver disposed in the third non-display area to be connected to the gate lines, a plurality of second transistors each connected to a corresponding gate line of the gate lines in the fourth non-display area, a second switching pad connected to the second transistors, and a plurality of second test pads connected to the second transistors, wherein the second transistors are divided into second groups respectively corresponding to the second test pads. The second transistors arranged in the same second group are commonly connected to a corresponding second test pad of the second test pads.

"Each of the second transistors includes a gate electrode connected to the second switching pad, a drain electrode connected to the corresponding gate line, and a source electrode connected to the corresponding second test pad, and the source electrodes of the second transistors arranged in the same second group are commonly connected to the corresponding second test pad.

"One or more embodiments of the invention may be related to a liquid crystal display that includes the following elements: a thin film transistor substrate that includes gate lines applied with gate signals, data lines applied with data voltages and crossing the gate lines, pixels connected to the gate lines and the data lines, a gate driver that applies the gate signals to the pixels, a data driver that applies the data voltages to the pixels, a color filter substrate facing the thin film transistor substrate, and a liquid crystal layer interposed between the thin film transistor substrate and the color filter substrate. The thin film transistor substrate includes a display area that includes the pixels, a non-display area disposed adjacent to the display area, a plurality of data pads disposed in the non-display area and each being connected to a first end of a corresponding data line of the data lines and the data driver, a plurality of first transistors disposed in the non-display area and each being connected to a second end of the corresponding data line of the data lines, a plurality of OS pads connected to the second end of the data lines, and a plurality of repair lines disposed in the non-display area along a vicinity of the display area and arranged while interposing the first transistors therebetween. The OS pads overlap the first transistors and the repair lines.

"According to the above, the thin film transistor substrate and the liquid crystal display having the thin film transistor substrate with an effectively and efficiently utilized non-display area. Advantageously, the size of the thin film transistor substrate and/or the size of the liquid crystal display may be minimized.

BRIEF DESCRIPTION OF THE DRAWINGS

"The above and other advantages of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:

"FIG. 1 is a plan view illustrating a thin film transistor substrate according to one or more embodiments of the present invention;

"FIG. 2 is a circuit diagram illustrating a first test part illustrated in FIG. 1;

"FIG. 3 is a layout illustrating a first area illustrated in FIG. 2;

"FIG. 4 is a cross-sectional view taken along a line I-I' indicated in FIG. 3;

"FIG. 5 is a circuit diagram illustrating a second test part illustrated in FIG. 1;

"FIG. 6 is a view for explaining an open/short test method;

"FIG. 7 is a view for explaining a repair method of repairing a data line that is open as indicated by a result of the open/short test method; and

"FIG. 8 is a perspective view illustrating a liquid crystal display that includes the thin film transistor substrate illustrated in FIG. 1."

For additional information on this patent application, see: RO, Sungin; PARK, Seunghyun; OH, Dong Gun. Thin Film Transistor Substrate and Liquid Crystal Display Including the Thin Film Transistor Substrate. Filed May 2, 2013 and posted July 10, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4953&p=100&f=G&l=50&d=PG01&S1=20140703.PD.&OS=PD/20140703&RS=PD/20140703

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

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Source: Politics & Government Week


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