Display Device and Electronic Equipment Using the Same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorJun Koyama
Life of this patent
Estimating the term…
Abstract
In an active matrix EL display device, pixels which are suitable for a constant current drive are structured. The pixel includes a first switch which has one end connected to a source signal line and the other end connected to a current-voltage conversion element, a second switch which has one end connected to the current-voltage conversion element and the other end connected to a voltage holding capacitor and to a voltage-current conversion element, and a pixel electrode connected to the current-voltage conversion element and to the voltage-current conversion element.
Claims16
1-25. (canceled)
A semiconductor device comprising:
- a first line;
- a second line;
- and
- a pixel comprising:
- a first transistor;
- a second transistor;
- a third transistor;
- and
- a pixel electrode,
- wherein a first terminal of the first transistor is electrically connected to the pixel electrode,
- wherein a second terminal of the first transistor is electrically connected to the first line,
- wherein a gate of the first transistor is electrically connected to a first terminal of the second transistor,
- wherein a second terminal of the second transistor is electrically connected to a first terminal of the third transistor,
- wherein a gate of the second transistor is electrically connected to the second line, and
- wherein a gate of the third transistor is electrically connected to the second line.
A semiconductor device comprising:
- a first line;
- a second line;
- and
- a pixel comprising:
- a first transistor;
- a second transistor;
- a third transistor;
- and
- a pixel electrode,
- wherein a first terminal of the first transistor is electrically connected to the pixel electrode,
- wherein a second terminal of the first transistor is electrically connected to the first line,
- wherein a gate of the first transistor is electrically connected to a first terminal of the second transistor,
- wherein a second terminal of the second transistor is electrically connected to a first terminal of the third transistor,
- wherein a gate of the second transistor is electrically connected to the second line,
- wherein a gate of the third transistor is electrically connected to the second line, and
- wherein the first line is configured to supply a constant voltage to the first transistor.
A semiconductor device comprising:
- a first line;
- a second line;
- a third line;
- and
- a pixel comprising:
- a first transistor;
- a second transistor;
- a third transistor;
- and
- a pixel electrode,
- wherein a first terminal of the first transistor is electrically connected to the pixel electrode,
- wherein a second terminal of the first transistor is electrically connected to the first line,
- wherein a gate of the first transistor is electrically connected to a first terminal of the second transistor,
- wherein a second terminal of the second transistor is electrically connected to a first terminal of the third transistor,
- wherein a gate of the second transistor is electrically connected to the second line,
- wherein a second terminal of the third transistor is electrically connected to the third line,
- wherein a gate of the third transistor is electrically connected to the second line, and
- wherein the third line is configured to supply a current to the pixel through the third transistor.
Dependencies are inferred from the claim text.