Electric device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorJun Koyama
Life of this patent
Estimating the term…
Abstract
There is provided an electric device which can prevent a deterioration in a frequency characteristic due to a large electric power external switch connected to an opposite electrode and can prevent a decrease in the number of gradations. The electric device includes a plurality of source signal lines, a plurality of gate signal lines, a plurality of power source supply lines, a plurality of power source control lines, and a plurality of pixels. Each of the plurality of pixels includes a switching TFT, an EL driving TFT, a power source controlling TFT, and an EL element, and the power source controlling TFT controls a potential difference between a cathode and an anode of the EL element.
Claims19
1-33. (canceled)
A light emitting display device comprising:
- a switching thin film transistor;
- an electro-luminescence driving thin film transistor;
- a power source controlling thin film transistor,
- an electro-luminescence element, and
- wherein one of a source electrode and a drain electrode of the switching thin film transistor is electrically connected to a gate electrode of the electro-luminescence driving thin film transistor, and
- wherein the power source controlling thin film transistor is electrically connected between the electro-luminescence driving thin film transistor and the electro-luminescence element.
A light emitting display device comprising:
- a power source control line;
- a switching thin film transistor;
- an electro-luminescence driving thin film transistor;
- a power source controlling thin film transistor,
- an electro-luminescence element, and
- wherein one of a source electrode and a drain electrode of the switching thin film transistor is electrically connected to a gate electrode of the electro-luminescence driving thin film transistor,
- wherein the power source controlling thin film transistor is electrically connected between the electro-luminescence driving thin film transistor and the electro-luminescence element, and
- wherein a gate electrode of the power source controlling thin film transistor is electrically connected to the power source control line.
A light emitting display device comprising:
- a capacitor;
- a switching thin film transistor;
- an electro-luminescence driving thin film transistor;
- a power source controlling thin film transistor,
- an electro-luminescence element, and
- wherein one of a source electrode and a drain electrode of the switching thin film transistor is electrically connected to a gate electrode of the electro-luminescence driving thin film transistor,
- wherein the power source controlling thin film transistor is electrically connected between the electro-luminescence driving thin film transistor and the electro-luminescence element, and
- wherein the capacitor is electrically connected between the gate electrode of the electro-luminescence driving thin film transistor and the other of the power source controlling thin film transistor.
Dependencies are inferred from the claim text.