Display device and manufacturing method of the same

1. A display device, comprising:

an insulating substrate;

a switching thin film transistor having an input terminal receiving a data voltage, a control terminal and an output terminal formed on the insulating substrate and having a first semiconductor layer comprising amorphous silicon;

a driving thin film transistor formed on the insulating substrate having a control terminal connected with an output terminal of the switching thin film transistor, the driving transistor including a second semiconductor layer comprising poly silicon;

a light sensor formed on the insulating substrate including a third semiconductor layer, a sensor input terminal and a sensor output terminal electrically connected with the third semiconductor layer;

an insulating layer formed on the light sensor;

a first electrode formed on the insulating layer and electrically connected with an output terminal of the driving thin film transistor;

an organic layer formed on the first electrode including a light emitting layer; a second electrode formed on the organic layer; and

a controller which controls the data voltage based on an output of the light sensor.

2. The display device according to claim 1 , wherein the third semiconductor layer comprise amorphous silicon.

3. The display device according to claim 2 , wherein the first semiconductor layer and the third semiconductor layer are the same layer.

4. The display device according to claim 2 , wherein a control terminal of the switching thin film transistor is formed between the first semiconductor layer and the insulating substrate.

5. The display device according to claim 4 , further comprising a metal layer which is disposed between the insulating substrate and the third semiconductor layer and prevents external light from being incident to the third semiconductor layer.

6. The display device according to claim 5 , wherein the metal layer receives a negative voltage.

7. The display device according to claim 5 , wherein the control terminal of the switching thin film transistor and the metal layer are the same layer.

8. The display device according to claim 2 , wherein the control terminal of the driving thin film transistor is formed between the second semiconductor layer and the insulating layer.

9. The display device according to claim 1 , wherein the third semiconductor layer comprise poly silicon.

10. The display device according to claim 9 , wherein the second semiconductor layer and the third semiconductor layer are the same layer.

11. The display device according to claim 9 , further comprising a metal layer which is formed between the insulating substrate and the third semiconductor layer and prevents external light from being incident to the third semiconductor layer.

12. The display device according to claim 11 , wherein the metal layer receives a negative voltage.

13. The display device according to claim 11 , wherein the control terminal of the driving thin film transistor is disposed between the second semiconductor layer and the insulating substrate, and the control terminal of the driving thin film transistor and the metal layer are the same layer.

14. The display device according to claim 1 , wherein the light emitting layer emits a white light, the display device further comprising a color filter which is disposed between the organic layer and the insulating substrate.

15. The display device according to claim 1 , further comprising a sensor thin film transistor which is connected with the sensor input terminal of the light sensor, wherein the sensor input terminal of the light sensor is connected with a drain electrode of the sensor thin film transistor.

16. The display device according to claim 15 , further comprising a sensor line which is connected with a source electrode of the sensor thin film transistor and supplies a uniform voltage.