200410060002 is referenced by 2 patents.

No need of lowering off-current of a switching transistor, fewer luminance variations of a light emitting element between pixels due to characteristic variations of a driving transistor, and less risk of steps due to increase in the number of wirings. A video signal for light emission or non-emission of a pixel is input to a gate of a current controlling transistor operated in a linear region, which is connected in series with the driving transistor, through a switching transistor. Since a voltage Vds between a source and a drain of the current controlling transistor is small, small changes in a voltage Vgs between a gate and a source thereof do not affect a current flowing in a load. The current flowing in the light emitting element is determined by the driving transistor operated in a saturation region, and a fixed potential is input to the gate thereof during light emission.

Title
Element substrate and light emitting device
Application Number
200410060002
Publication Number
1574385
Application Date
June 18, 2004
Publication Date
February 2, 2005
Inventor
Osame Mitsuaki
Yamazaki Yu
Anazai Aya
Fukumoto Ryota
Agent
zhang xuemei liang yong
Assignee
Semiconductor Energy Laboratory
IPC
H05B 33/00
H01L 51/30
H01L 27/15
G09G 03/00