Display device

1. A display device, comprising:

light emitting pixels and light receiving pixels disposed in a display region; and

a reset line, a fingerprint scan line, and a fingerprint sensing line disposed in the display region, wherein each of the light receiving pixels includes:

a light receiving element including a first electrode and a second electrode;

a sensing transistor configured to connect the first electrode of the light receiving element to the fingerprint sensing line according to a fingerprint scan signal applied to the fingerprint scan line; and

a reset transistor configured to connect a first voltage source to the first electrode of the light receiving element according to a reset signal applied to the reset line, wherein the second electrode of the light receiving element is connected to a second voltage source, a first voltage applied to the first voltage source is greater than a second voltage applied to the second voltage source, and a third voltage applied to the fingerprint sensing line is greater than the second voltage and smaller than the first voltage.

2. The display device of claim 1 , wherein the reset signal and the fingerprint scan signal are different signals.

3. The display device of claim 1 , wherein the reset transistor is configured to be turned on twice or more during one frame period.

4. The display device of claim 1 , wherein the light receiving element is configured to operate in a forward bias state during a period in which the reset transistor is turned on.

5. The display device of claim 1 , wherein a voltage difference between the first voltage and the second voltage is greater than a threshold voltage of the light receiving element.

6. The display device of claim 5 , wherein:

the light receiving pixel further includes a sensing node disposed between the first electrode of the light receiving element and the sensing transistor, and

a voltage of the sensing node increases during a period in which the light receiving pixel is exposed to light.

7. The display device of claim 1 , further comprising:

a first scan line, an initialization voltage line, and a second scan line,

wherein each of the light emitting pixels includes:

a light emitting element including a first electrode and a second electrode connected to the second voltage source;

a first transistor disposed between the light emitting element and the first voltage source; and

a second transistor configured to initialize a voltage of a gate electrode of the first transistor to an initialization voltage of the initialization voltage line according to a first scan signal of the first scan line.

8. The display device of claim 7 , wherein:

the first transistor is a P-type transistor, and

the sensing transistor and the second transistor are N-type transistors.

9. The display device of claim 7 , wherein the first scan signal corresponds to the fingerprint scan signal.

10. The display device of claim 9 , wherein the first scan signal and the reset signal are different signals.

11. The display device of claim 9 , further comprising:

a data line connected to the light emitting pixel,

wherein each of the light emitting pixels further includes:

a third transistor configured to apply a data voltage of the data line to a first electrode of the first transistor according to a second scan signal of the second scan line; and

a fourth transistor configured to connect the gate electrode and a second electrode of the first transistor to each other according to the second scan signal, and

the second scan signal is a signal different from the first scan signal and the reset signal.

12. The display device of claim 11 , wherein a period in which the reset transistor is turned on by the reset signal is longer than a period in which each of the third transistor and the fourth transistor is turned on by the second scan signal.

13. The display device of claim 11 , wherein the reset transistor is configured to be turned on at least twice during a period in which the second transistor is turned on by the second scan signal.

14. A display device, comprising:

a plurality of fingerprint scan lines configured to receive first scan signals;

a plurality of fingerprint sensing lines;

a reset line configured to receive a reset signal;

a reset transistor configured to be controlled by the reset signal and including a first electrode connected to a first voltage source configured to receive a first voltage; and

light receiving pixels, each connected to one of the plurality of fingerprint scan lines, one of the plurality of fingerprint sensing lines, and a second voltage source configured to receive a second voltage smaller than the first voltage,

wherein each of the light receiving pixels includes:

a light receiving element including a first electrode and a second electrode, the second electrode connected to the second voltage source;

a sensing transistor configured to connect the first electrode of the light receiving element to the fingerprint sensing line according to a scan signal applied to the fingerprint scan line; and

a connection line connecting the first electrode of the light receiving element to a second electrode of the reset transistor, wherein the plurality of fingerprint sensing lines are configured to receive a third voltage smaller than the first voltage and greater than the second voltage.

15. The display device of claim 14 , wherein a period in which the sensing transistor is turned on by the first scan signals and a period in which the reset transistor is turned on by the reset signal do not overlap each other.

16. A display device, comprising:

a display region having a fingerprint sensing region therein; and

a non-display region disposed adjacent to the display region,

wherein the fingerprint sensing region includes a plurality of light emitting pixels and a plurality of light receiving pixels alternately arranged in a matrix direction, each of the plurality of light emitting pixels includes:

a light emitting element including a first electrode and a second electrode;

a first transistor disposed between the light emitting element and a first voltage source; and

a second transistor configured to initialize a voltage of a gate electrode of the first transistor to an initialization voltage of an initialization voltage line according to a first scan signal of a first scan line, and

each of the plurality of light receiving pixels includes:

a light receiving element including a first electrode and a second electrode connected to a second voltage source;

a sensing transistor configured to connect the first electrode of the light receiving element to a fingerprint sensing line according to a fingerprint scan signal applied to a fingerprint scan line; and

a reset transistor configured to connect the first voltage source to the first electrode of the light receiving element according to a reset signal applied to a reset line, wherein the second electrode of the light emitting element is connected to the second voltage source.

17. The display device of claim 16 , wherein the light receiving element is configured to operate in a forward bias state during a period in which the reset transistor is turned on by the reset signal.

18. The display device of claim 16 , wherein the first scan signal and the reset signal are different signals.

19. The display device of claim 18 , wherein:

each of the plurality of light emitting pixels includes a third transistor configured to apply a data voltage of a data line to a first electrode of the first transistor according to a second scan signal of a second scan line, and

the second scan signal is a signal different from the first scan signal and the reset signal.

20. The display device of claim 19 , wherein the second scan signal corresponds to the fingerprint scan signal.