US 7,460,095 B2 · Display device and manufacturing method thereof

Abstract

A display device capable of applying reverse driving voltage for a light emitting element to a light emitting element every certain period for prolonging light emitting element's life and burning out a shorted portion. Besides a path for supplying forward current to the light emitting element, a path for supplying reverse current is provided. A driving transistor is provided in the former path while a transistor (AC transistor) is provided in the latter path, thereby a switching between the two paths is controlled. The AC transistor has a rate L/W of a channel length L to a channel width W smaller than that of the driving transistor. Accordingly, current flowing into the light emitting element can flow into the AC transistor in the case of reverse driving voltage being applied to the light emitting element.

Claims24

Dependent claims

A display device having a plurality of pixels, each of the plurality of pixels comprising:

a light emitting element;
a driving transistor for controlling the amount of forward current flowing into the light emitting element;
a switching transistor for controlling input of a video signal;
and
an AC transistor for controlling reverse current flowing into the light emitting element,
wherein the driving transistor and the AC transistor have the identical polarity.

3 more elements

A display device having a plurality of pixels, each of the plurality of pixels comprising:

a light emitting element;
a driving transistor for controlling the amount of forward current flowing into the light emitting element;
a switching transistor for controlling input of a video signal;
and
an AC transistor for controlling reverse current flowing into the light emitting element,
wherein the light emitting element comprises a pixel electrode and an opposing electrode;
wherein a gate electrode of the switching transistor is connected to a gate signal line;
wherein one of a source electrode and a drain electrode of the switching transistor is connected to a source signal line flowing the video signal while the other is connected to a gate electrode of the driving transistor;
wherein one of a source electrode and a drain electrode of the driving transistor is connected to a power source line while the other is connected to the pixel electrode of the light emitting element;
wherein a gate electrode of the AC transistor is connected to the power source line;
wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode while the other is connected to the power source line;
wherein the driving transistor and the AC transistor have the identical polarity;
wherein the driving transistor operates in the saturation region;
and
wherein the AC transistor operates in the linear region.

12 more elements

A display device having a plurality of pixels, each of the plurality of pixels comprising:

a light emitting element;
a driving transistor for controlling the amount of forward current flowing into the light emitting element;
a switching transistor for controlling input of a video signal;
and
an AC transistor for controlling reverse current flowing into the light emitting element
wherein the light emitting element comprises a pixel electrode and an opposing electrode;
wherein a gate electrode of the switching transistor is connected to a gate signal line;
wherein one of a source electrode and a drain electrode of the switching transistor is connected to a source signal line flowing the video signal while the other is connected to a gate electrode of the driving transistor;
wherein one of a source electrode and a drain electrode of the driving transistor is connected to a power source line while the other is connected to the pixel electrode of the light emitting element;
wherein a gate electrode of the AC transistor is connected to the power source line;
wherein one of a source electrode and a drain electrode of the AC transistor is connected to the pixel electrode while the other is connected to the power source line;
and
wherein the driving transistor and the AC transistor have the identical polarity.

10 more elements

Dependencies are inferred from the claim text.

Display device and manufacturing method thereof

Life of this patent

Display device and manufacturing method thereof

Life of this patent

Abstract

Claims24