Display apparatus and method of measuring liquid crystal capacitance
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United States of America Patent
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Mar 17, 2015
Grant Date -
Oct 17, 2013
app pub date -
Sep 7, 2012
filing date -
Apr 12, 2012
priority date (Note) -
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Abstract
A display apparatus includes: a first substrate including display and peripheral area surrounding the display area, where the first substrate includes pixel electrodes in the display area, and dummy pixel electrodes in the peripheral area; a second substrate opposite to and coupled to the first substrate, where the second substrate includes a reference electrode facing the pixel electrodes and facing the dummy pixel electrodes; and a liquid crystal layer between the first substrate and the second substrate, where the first substrate further includes a test line electrically connected to the dummy pixel electrodes, a first pad electrode configured to apply a test voltage to the test line to measure a liquid crystal capacitance, a reference voltage line configured to receive a reference voltage from an external source, and a second pad electrode configured to apply the reference voltage to the reference voltage line to measure the liquid crystal capacitance.
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