Patent ID: 8199141

Claim:
A display device comprising: a first circuit configured to sample a video signal; power supply lines configured to be supplied with different power supply voltages; a second circuit configured to select sequentially the power supply lines, to increase step by step an absolute value of the video signal and to supply the video signal to a signal line; a transistor electrically connected to the signal line; a display element electrically connected to the transistor; and a capacitor element electrically connected to the transistor, wherein the second circuit is electrically connected to the display element and to the capacitor element through the transistor, wherein a voltage applied between a source and a drain of the transistor over time is represented by the following formula: ΔV sig ×e −(t−t s )/τ , wherein t is a time, wherein τ is a relaxation time, wherein ΔV sig is a difference between a potential of a first power supply line and a potential of a second power supply line, wherein t s is a period for switching from the first power supply line to the second power supply line, wherein a relation of t and t s is represented by a following formula: m×t s <t ≦( m +1)× t s <t w , wherein m is an integer larger than 1, wherein t w is a time of one frame period, and wherein the first power supply line and the second power supply line are included in the power supply lines and are adjacent to each other.