A spatial light modulation device capable of displaying a large number of
gray scales is provided. The inventors of the present invention proposed a
spatial light modulation device having: a first structure in which a
switching transistor and an erasure transistor, each having its gate
electrode connected to a different scanning line, are formed in each
pixel, and whose switching is controlled separately; or a second structure
in which two switching transistors, each having its gate electrode
connected to a different scanning line, are formed in each pixel, and
whose switching is controlled separately.
