(i9) United States
(12) Patent Application Publication oo) Pub. No.: US 2007/0120785 Al
KIMURA (43) Pub. Date: May 31,2007
(54) DISPLAY DEVICE
(75) Inventor: Hajime KIMURA, Atsugi (JP)
FISH & RICHARDSON P.C.
P.O. BOX 1022
MINNEAPOLIS, MN 55440-1022 (US)
(73) Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi-shi (JP)
(21) Appl. No.: 11/563,894
(22) Filed: Nov. 28, 2006
(30) Foreign Application Priority Data
Nov. 30, 2005 (JP) 2005-345341
To provide a high-performance and highly reliable display device with a high aperture ratio, including light-emitting elements, and a manufacturing method thereof, and a technique for manufacturing such a display device at a low cost with high productivity. A compensating circuit, a lightemitting element, a switch, and a transistor are included, in which one terminal of the switch is electrically connected to the compensating circuit, a gate of the transistor is electrically connected to the compensating circuit, one of a source and a drain of the transistor is electrically connected to a first electrode of the light-emitting element, the other of the source and the drain of the transistor is maintained at a certain potential, and a second electrode of the light-emitting element and the other terminal of the switch are electrically connected to the same wire.