| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a display device with reduced power consumption. <P>SOLUTION: The display device includes a pixel portion including a plurality of pixels each including a first transistor, a second transistor, and a light-emitting element having a pair of electrodes. A gate of the first transistor is electrically connected to a scan line, one of a source and a drain of the first transistor is electrically connected to a signal line, and the other of them is electrically connected to a gate of the second transistor. One of a source and a drain of the second transistor is electrically connected to a power supply line and the other of them is electrically connected to one of the pair of electrodes. The first transistor includes an oxide semiconductor layer having a hydrogen concentration of≤5×10<SP>19</SP>/cm<SP>3</SP>. A period during which the display device displays a still image includes a period during which output of a signal to all the scan lines in the pixel portion is stopped. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
