The invention provides a display device including an insulating substrate, a photosensor formed on the insulating substrate and including a semiconductor layer, an input terminal and an output terminal electrically connected to the semiconductor layer, a first insulating layer formed on the photosensor, a pixel electrode, an organic layer, and a common electrode layer sequentially formed on the first insulating layer, and a controller that controls an input to the pixel electrode based on an output of the photosensor.
1. A display device, comprising:
a substrate;
a photosensor arranged on the substrate and comprising a semiconductor layer, an input terminal electrically connected to the semiconductor layer, and an output terminal electrically connected to the semiconductor layer;
a first insulating layer arranged on the photosensor;
a pixel electrode, an organic layer, and a common electrode layer sequentially arranged on the first insulating layer; and
a controller that controls an input to the pixel electrode based on an output of the photosensor.
2. The display device of claim 1 , wherein the semiconductor layer comprises amorphous silicon.
3. The display device of claim 1 , wherein the photosensor further comprises an ohmic contact layer arranged between the semiconductor layer and the input terminal and between the semiconductor layer and the output terminal.
4. The display device of claim 1 , further comprising a metal layer arranged between the semiconductor layer and the substrate, wherein the metal layer prevents external light from being incident on the semiconductor layer.
5. The display device of claim 4 , further comprising a second insulating layer arranged between the metal layer and the semiconductor layer,
wherein a negative voltage is applied to the metal layer.
6. The display device of claim 1 , wherein a dielectric constant of the first insulating layer is less than or equal to 4.
7. The display device of claim 1 , wherein the first insulating layer comprises one of fluorine-doped silicon oxide (SiOF), silicon oxycarbide (SiOC), and an organic material.
8. The display device of claim 7 , wherein the organic material is one of benzocyclobutene (BCB), olefin, acrylic resin, polyimide, and fluoropolymer.
9. The display device of claim 1 , wherein the first insulating layer is 1 μm to 5 μm thick.
10. The display device of claim 1 , further comprising a passivation layer arranged between the semiconductor layer and the first insulating layer.
11. The display device of claim 10 , wherein the passivation layer comprises silicon nitride.
12. The display device of claim 10 , wherein the hole injecting layer comprises poly(3,4-ethylenedioxythiophene) and polystyrene sulfonic acid.
13. The display device of claim 1 , further comprising a sensor transistor,
wherein the input terminal of the photosensor is connected to a drain electrode of the sensor transistor.
14. The display device of claim 13 , further comprising a sensor line,
the sensor line being connected to a source electrode of the sensor transistor to apply a uniform voltage to the source electrode of the sensor transistor.
15. The display device of claim 1 , further comprising a storage capacitor forming unit, the storage capacitor forming unit being integrally formed with the input terminal of the photosensor to form a sensor storage capacitor.
16. The display device of claim 15 , further comprising:
a sensor storage capacitor forming unit and a metal layer arranged between the substrate and the storage capacitor forming unit; and
a second insulating layer arranged between the storage capacitor forming unit and the metal layer.
17. The display device of claim 16 , further comprising a transparent electrode layer arranged on the storage capacitor forming unit, the transparent electrode layer being electrically connected to the metal layer,
wherein the first insulating layer is arranged between the transparent electrode layer and the storage capacitor forming unit.
18. The display device of claim 1 , further comprising gate lines and data lines crossing with each other,
wherein the output terminal of the photosensor is electrically connected to a gate line.
19. The display device of claim 1 , wherein the semiconductor layer is band shaped.
20. The display device of claim 1 , wherein the organic layer comprises a hole injecting layer and a light emitting layer arranged on the hole injecting layer.
21. The display device of claim 20 , wherein the light emitting layer comprises a polymer.
22. The display device of claim 1 , wherein the input terminal is electrically connected to a first end of the semiconductor layer and the output terminal is electrically connected to a second end of the semiconductor layer, the first end and the second end being different ends of the semiconductor layer.
23. The display device of claim 1 , wherein the display device is a bottom-emission display device.