Light-emitting device

Details Light-emitting device Light-emitting device

2007-08-28

2007-08-28

Phan, Tho (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169300, C315S169400, C315S159000, C345S092000, C345S076000

Reexamination Certificate

active

11147317

ABSTRACT:
A light-emitting device which realizes a high aperture ratio and in which the quality of image is little affected by the variation in the characteristics of TFTs. A large holding capacitor Cs is not provided in the pixel portion but, instead, the channel length and the channel width of the driving TFTs are increased, and the channel capacitance is utilized as Cs. The channel length is selected to be very larger than the channel width to improve current characteristics in the saturated region, and a high VGSis applied to the driving TFTs to obtain a desired drain current. Therefore, the drain currents of the driving TFTs are little affected by the variation in the threshold voltage. In laying out the pixels, further, wiring is arranged under the partitioning wall and the driving TFTs are arranged under the wiring in order to avoid a decrease in the aperture ratio despite of an increase in the size of the driving TFT. In the case of the 3-transistor pixels, the switching TFT and the erasing TFT are linearly arranged to further increase the aperture ratio.

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