Light emitting device and electronic equipment using the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorJun Koyama
Life of this patent
Estimating the term…
Abstract
A pixel suitable for constant current operation of an active matrix type EL display device. The pixel comprises a first switch of which one terminal is connected to a source signal line whereas another terminal is connected to a current-voltage conversion element, a second switch of which one terminal is connected to the current-voltage conversion element whereas another terminal is connected to a voltage storage means and a voltage-current conversion element, a pixel electrode which is connected to the current-voltage conversion element and the voltage-current conversion element, and a third switch of which one terminal is connected to the pixel electrode whereas another terminal is connected to the power source line.
Claims34
A light-emitting device comprising:
- a pixel, a source signal line, a gate signal line, and a power source line, the pixel comprising:
- a first switch of which one terminal is connected to the source signal line, and another terminal is connected to a current-voltage conversion element;
- a second switch of which one terminal is connected to the current-voltage conversion element, and another terminal is connected to a storage means and a voltage-current conversion element;
- a pixel electrode which is connected to the current-voltage conversion element and the voltage-current conversion element;
- a third switch of which one terminal is connected to the pixel electrode, and another terminal is connected to the power source line;
- and
- a light-emitting element of which one electrode comprises the pixel electrode.
A light-emitting device comprising:
- a pixel, a source signal line, a gate signal line, and a power source line, the pixel comprising:
- a first switch of which one terminal is connected to the source signal line, and another terminal is connected to a drain terminal of a first thin film transistor;
- a second switch of which one terminal is connected to the drain terminal of the first thin film transistor, and another terminal is connected to a gate terminal of the first thin film transistor, a storage means and a gate terminal of a second thin film transistor;
- a pixel electrode which is connected to a source terminal of the first thin film transistor and a source terminal of the second thin film transistor;
- a third switch of which one terminal is connected to the pixel electrode, and another terminal is connected to the power source line;
- and
- a light-emitting element of which one electrode comprises the pixel electrode.
An electronic equipment comprising:
- a display portion as a display medium comprising a pixel, a source signal line, a gate signal line, and a power source line, the pixel comprising:
- a first switch of which one terminal is connected to the source signal line, and another terminal is connected to a current-voltage conversion element;
- a second switch of which one terminal is connected to the current-voltage conversion element, and another terminal is connected to a storage means and a voltage-current conversion element;
- a pixel electrode which is connected to the current-voltage conversion element and the voltage-current conversion element;
- a third switch of which one terminal is connected to the pixel electrode, and another terminal is connected to the power source line;
- and
- a light-emitting element of which one electrode comprises the pixel electrode.
An electronic equipment comprising:
- a display portion as a display medium comprising a pixel, a source signal line, a gate signal line, and a power source line, the pixel comprising:
- a first switch of which one terminal is connected to the source signal line, and another terminal is connected to a drain terminal of a first thin film transistor;
- a second switch of which one terminal is connected to the drain terminal of the first thin film transistor, and another terminal is connected to a gate terminal of the first thin film transistor, a storage means and a gate terminal of a second thin film transistor;
- a pixel electrode which is connected to a source terminal of the first thin film transistor and a source terminal of the second thin film transistor;
- a third switch of which one terminal is connected to the pixel electrode, and another terminal is connected to the power source line;
- and
- a light-emitting element of which one electrode comprises the pixel electrode.
Dependencies are inferred from the claim text.