Active matrix display device and semiconductor device for timing control thereof

A semiconductor device for timing control of an active matrix display device that includes a plurality of pixels that are disposed in a matrix including a plurality of columns and rows, a plurality of image signal lines that are disposed to correspond to respective columns of the pixels, a plurality of scanning signal lines that are disposed to correspond to respective rows of the pixels, and an image signal line driving unit that supplies image signals for driving the pixels to the image signal lines, the semiconductor device comprising:

• a timing control circuit that transmits an image display control signal to the image signal line driving unit with a predetermined cycle even during a vertical blanking period,
• wherein the timing control circuit performs a control operation that allows the image signal line driving unit to intermit a read operation of image display data during a first period, the first period that is defined within the vertical blanking period and that includes at least a second half of the vertical blanking period.