Patent ID: 7528811

Claim:
A semiconductor display device comprising: a pixel portion; a signal line driver circuit; a first scan line driver circuit; and a second scan line driver circuit, wherein the pixel portion includes a plurality of pixels disposed in rows and columns, which are respectively connected to the signal line driver circuit through signal lines and to the first scan line driver circuit and the second scan line driver circuit through scan lines; the plurality of pixels are selected per row by the first scan line driver circuit; the plurality of pixels are selected per row by the second scan line driver circuit; writing of a first video signal to a row selected by the first scan line driver circuit is controlled by the signal line driver circuit; writing of a second video signal to a row selected by the second scan line driver circuit is controlled by the signal line driver circuit; the first scan line driver circuit includes a first selection circuit; the second scan line driver circuit includes a second selection circuit; a row writing period for inputting x video signals to x pixels provided in one row is divided into a first row writing period and a second row writing period where x is the number of pixels in one row; an output from the second scan line driver circuit to the plurality of pixels is set at high impedance by the second selection circuit included in the second scan line driver circuit while the row is selected by the first scan line driver circuit during the first row writing period wherein a first signal is inputted into the row through the first selection circuit from a first selection signal generating circuit provided in the first scan line driver circuit during the first row writing period; and an output from the first scan line driver circuit to the plurality of pixels is set at high impedance by the first selection circuit included in the first scan line driver circuit while the row is selected by the second scan line driver circuit during the second row writing period wherein a second signal is inputted into the row through the second selection circuit from a second selection signal generating circuit provided in the second scan line driver circuit during the second row writing period.