| 摘要 |
PROBLEM TO BE SOLVED: To reduce the dispersion in luminance which occurs in a light-emitting device having OLEDs. SOLUTION: A TFT that is formed with a channel-forming region having a channel length particularly longer than that of an existing one, specifically, several tens to several hundreds times longer than that of the existing one so as to meander, and thereby allowing turning to an on-state at a gate voltage particularly higher than the existing one and driving, and allowing having a low channel conductance gd, is provided. According to the present invention, not only the simple dispersion of on-current but also the normalized dispersion thereof can be reduced, and other than the reduction of the dispersion between the individual TFTs, the dispersion of the OLEDs themselves and the dispersion due to the deterioration of the OLED can be reduced. COPYRIGHT: (C)2005,JPO&NCIPI |
