Active matrix liquid crystal display devices having a metal light shield for each switching device electrically connected to an adjacent row address conductor
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United States of America Patent
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Jul 14, 1992
Grant Date -
N/A
app pub date -
Jun 7, 1991
filing date -
Jun 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An active matrix liquid crystal display device includes on a first substrate (30) a row and column array of picture element electrodes (20), associated switching devices (11), e.g. a-Si or polysilicon TFTs, and sets of row and column address conductors (14,16) to which selection and data signals are applied respectively, the picture elements being driven a row at a time in sequence by scanning the row conductors with a selection signal. Each switching device (11) is provided with a metal light shield (45) extending over the active region of the device (11) which is connected (46) electrically to the row address conductor (14) adjacent the one to which the switching device is connected. Because the adjacent row conductor is at a reference potential for most of the time, parasitic capacitance effects due to the metal light shield are negligible.
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