Liquid crystal cells – elements and systems – Liquid crystal system – Liquid crystal writing tablet
Reexamination Certificate
2007-10-09
2007-10-09
Nelms, David (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Liquid crystal writing tablet
C345S174000
Reexamination Certificate
active
10865996
ABSTRACT:
The present invention relates to an LCD device having a touch screen function. The LCD device of the present invention includes a plurality of gate lines, a plurality of data lines intersecting the gate lines, and a plurality of signal lines that are insulated from and juxtaposed with the data lines. First to third switching elements are formed in each of a plurality of pixel regions in the form of a matrix, which are surrounded by the gate lines and the data lines. Here, a gate electrode of the first switching element is connected to a gate line Gn, a source electrode thereof is connected to the data line, and a drain electrode thereof is connected to a pixel electrode. Further, liquid crystal capacitance and storage capacitance are formed between the pixel electrode and a common electrode. At this time, the liquid crystal capacitance is changed due to variation in the liquid crystal cell gap. The second and third switching elements are designed to read variation in the liquid crystal capacitance. A source electrode of the second switching element is connected to the pixel electrode, a drain electrode thereof is connected to the signal line, and a gate electrode thereof is connected to a previous gate line Gn-1. Furthermore, a source electrode of the third switching element is connected to the data line, a drain electrode thereof is connected to the pixel electrode, and a gate electrode thereof is connected to a second previous gate line Gn-2. Each signal line is connected to each signal amplifier.
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PCT Written Opinion of the International Searching Authority (PCT/KR2004/000184) PCT International Search Report (PCT/KR2004/000184).
Choi Joon-hoo
Joo In-soo
Cantor & Colburn LLP
Nelms David
Samsung Electronics Co,. Ltd.
Vu Phu
LandOfFree
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