A liquid crystal display device comprises a poly-silicon TFT substrate having
a
condenser type digital analog converter, an another substrate disposed so as to
face the poly-silicon TFT substrate, and liquid crystal positioned between the
poly-silicon TFT substrate and the another substrate. In this liquid crystal device,
a light blocking film is formed on a surface of the another substrate and contacts
with the liquid crystal. The light blocking film has a resistance larger than n/CLC
wherein n is a number of bits of the condenser type digital analog converter,
is an operation stabilizing time of a condenser per one bit, and CLC is
electrostatic capacitance between the poly-silicon TFT substrate and the another substrate.
