Organic light-emitting display apparatus

1. A pixel of an organic light-emitting display apparatus arranged on a substrate comprising:

a display region comprising at least one pixel thin film transistor and an organic light emitting device electrically connected to the pixel thin film transistor; and

a sensor region comprising a sensor thin film transistor, a charging unit, and a switch thin film transistor, wherein:

the sensor thin film transistor comprises an amorphous silicon layer, a first insulating layer, and a sensor gate electrode that are sequentially stacked;

the charging unit comprises a first charging electrode, a portion of the first insulating layer, and a second charging electrode that are sequentially stacked, the first charging electrode comprising a polysilicon layer placed on the same plane as the amorphous silicon layer, and the second charging electrode being placed on the same plane as the sensor gate electrode; and

the switch thin film transistor is electrically connected to the at least one pixel in the display region and comprises a polysilicon layer, a portion of the first insulating layer, and a switch gate electrode that are sequentially stacked, the polysilicon layer being placed on the same plane as the first charging electrode, and the switch gate electrode being placed on the same plane as the second charging electrode.

2. The pixel of the organic light-emitting display apparatus of claim 1 , wherein the sensor gate electrode, the second charging electrode, and the switch gate electrode are made of metal.

3. The pixel of the organic light-emitting display apparatus of claim 1 , wherein the sensor region comprises a second insulating layer disposed on the sensor gate electrode, the second charging electrode, and the switch gate electrode,

wherein the sensor thin film transistor comprises a first source electrode and a first drain electrode disposed on the second insulating layer, the first source electrode and the first drain electrode being electrically connected to the amorphous silicon layer via contact holes of the sensor thin film transistor,

wherein the switch thin film transistor further comprises a second source electrode and a second drain electrode disposed on the second insulating layer, the second source electrode and the second drain electrode being electrically connected to the polysilicon layer via contact holes of the switch thin film transistor, and

wherein one of the first source electrode and the first drain electrode and one of the second source electrode and the second drain electrode are connected to the second charging electrode via contact holes.

4. The pixel of the organic light-emitting display apparatus of claim 1 , wherein in the pixel thin film transistor, a polysilicon layer, the first insulating layer, and a pixel gate electrode are sequentially stacked, and the polysilicon layer is placed on the same plane as the amorphous silicon layer of the sensor region.

5. The pixel of the organic light-emitting display apparatus of claim 4 , wherein the pixel gate electrode is placed on the same plane as the sensor gate electrode, the second charging electrode, and the switch gate electrode of the sensor region, and is made of metal.

6. The pixel of the organic light-emitting display apparatus of claim 4 , wherein the display region further comprises the second insulating layer disposed on the pixel gate electrode, and

wherein the pixel thin film transistor comprises a third source electrode and a third drain electrode disposed on the second insulating layer, and the third source electrode and the third drain electrode are electrically connected to the polysilicon layer via contact holes of the pixel thin film transistor.

7. The pixel of the organic light-emitting display apparatus of claim 6 , wherein the organic light-emitting device of the display region comprises a first electrode, a light emitting layer, and a second electrode, and

wherein the first electrode is connected to one of the third source electrode and the third drain electrode.

8. The pixel of the organic light-emitting display apparatus of claim 1 , wherein an image is displayed in an opposite direction to the substrate.

9. The pixel of the organic light-emitting display apparatus of claim 1 , wherein the switch thin film transistor in the sensor region is directly electrically connected to the pixel thin film transistor in the display region.

10. A pixel of an organic light-emitting display apparatus arranged on a substrate comprising:

a display region comprising at least one pixel thin film transistor and an organic light emitting device electrically connected to the pixel thin film transistor; and

a sensor region comprising a sensor thin film transistor, a charging unit, and a switch thin film transistor, wherein:

the sensor thin film transistor comprises an amorphous silicon layer, a first insulating layer, a sensor gate electrode, and a second insulating layer that are sequentially stacked;

the charging unit comprises a first charging electrode, a portion of the first insulating layer, a second charging electrode, and a portion of the second insulating layer that are sequentially stacked, the first charging electrode comprising a polysilicon layer placed on the same plane as the amorphous silicon layer and the second charging electrode being placed on the same plane as the sensor gate electrode; and

the switch thin film transistor is electrically connected to the at least one pixel in the display region and comprises a portion of the first insulating layer, a polysilicon layer, a portion of the second insulating layer, and a switch gate electrode that are sequentially stacked, the polysilicon layer being placed on the same plane as the second charging electrode.

11. The pixel of the organic light-emitting display apparatus of claim 10 , wherein the sensor gate electrode and the first charging electrode are made of polysilicon.

12. The pixel of the organic light-emitting display apparatus of claim 10 , wherein the switch gate electrode is made of metal.

13. The pixel of the organic light-emitting display apparatus of claim 10 , wherein in the pixel thin film transistor, the first insulating layer, a polysilicon layer, the second insulating layer, and a pixel gate electrode are sequentially stacked, and

wherein the polysilicon layer is placed on a same plane as the polysilicon layer of the switch thin film transistor, and the pixel gate electrode is placed on a same plane as the switch gate electrode.

14. The pixel of the organic light-emitting display apparatus of claim 13 , wherein the display region comprises the third insulating layer disposed on the pixel gate electrode, and

wherein the pixel thin film transistor comprises a third source electrode and a third drain electrode disposed on the third insulating layer, and the third source electrode and the third drain electrode are electrically connected to the polysilicon layer via contact holes of the pixel thin film transistor.

15. The pixel of the organic light-emitting display apparatus of claim 14 , wherein the organic light-emitting device comprises a first electrode, a light-emitting layer, and a second electrode, and

wherein the first electrode is connected to one of the third source electrode and the third drain electrode.

16. The pixel of the organic light-emitting display apparatus of claim 15 , wherein the first electrode is a reflective electrode and the second electrode is a transparent electrode.

17. The pixel of the organic light-emitting display apparatus of claim 10 , wherein the sensor region further comprises a third insulating layer disposed on the second insulating layer and the switch gate electrode,

wherein the sensor thin film transistor comprises a first source electrode and a first drain electrode disposed on the third insulating layer, the first source electrode and the first drain electrode being electrically connected to the amorphous silicon layer via contact holes of the sensor thin film transistor,

wherein the switch thin film transistor comprises a second source electrode and a second drain electrode disposed on the third insulating layer, the second source electrode and the second drain electrode being electrically connected to the polysilicon layer via contact holes of the switch thin film transistor, and

wherein one of the first source electrode and the first drain electrode and one of the second source electrode and the second drain electrode are connected to the second charging electrode via contact holes of the charging unit.

18. An organic light-emitting display apparatus comprising a plurality of pixels arranged on a substrate, each pixel comprising:

a display region comprising at least one pixel thin film transistor and an organic light emitting device electrically connected to the pixel thin film transistor; and

a sensor region comprising a sensor thin film transistor, a charging unit, and a switch thin film transistor, wherein,

the sensor thin film transistor comprises an amorphous silicon layer, a sensor gate electrode, and source/drain electrodes, the amorphous silicon layer being disposed closer than the sensor gate electrode to the substrate, and

the switch thin film transistor is electrically connected to the at least one pixel thin film transistor in the display region.