Display device

A display device comprising:

• a pixel including a display driver configured to apply a driving current to a light-emitting element;
• and
• an optical sensor including a sensing driver configured to apply a sensing current to a read-out line in accordance with a photocurrent from a photoelectric conversion element,
• wherein the pixel further includes a driving transistor configured to control the driving current, and a first transistor configured to apply a first initialization voltage to an anode of the light-emitting element based on an emission control signal, and
• the optical sensor further includes a first sensing transistor configured to control a sensing current flowing into the read-out line based on a voltage of a sensing anode of the photoelectric conversion element, and a reset transistor configured to provide a first-level voltage directly to a sensing anode of the photoelectric conversion element to initialize the sensing anode of the photoelectric conversion element to the first-level voltage that is also used to set the emission control signal to turn off the first transistor,
• wherein the pixel further includes a second transistor configured to connect the anode of the light-emitting element to a first electrode of the driving transistor based on the emission control signal, and the second transistor is turned on when the emission control signal having the first-level voltage is applied to the second transistor, and
• wherein a first electrode of the reset transistor is directly connected to a voltage line configured to provide the first-level voltage.

An electronic device comprising:

• a display device, comprising:
• a pixel including a display driver configured to apply a driving current to a light-emitting element;
• and
• an optical sensor including a sensing driver configured to apply a sensing current to a read-out line in accordance with a photocurrent from a photoelectric conversion element,
• wherein the pixel further comprises:
• a driving transistor configured to control the driving current;
• a first transistor configured to apply a first initialization voltage to an anode of the light-emitting element based on an emission control signal;
• and
• a second transistor configured to connect the anode of the light-emitting element to a first electrode of the driving transistor based on the emission control signal, and
• wherein a channel of the first transistor is a different material from channels of the driving transistor and the second transistor,
• wherein the optical sensor further comprises a reset transistor providing a first-level voltage directly to a sensing anode of the photoelectric conversion element for initializing the sensing anode of the photoelectric conversion element to the first-level voltage that is also used to set the emission control signal to turn off the first transistor,
• wherein the first transistor is turned on when the emission control signal is at a second-level voltage,
• wherein the initializing occurs when a gate electrode of the reset transistor receives the second-level voltage higher than the first-level voltage, and
• wherein a first electrode of the reset transistor is directly connected to a voltage line configured to provide the first-level voltage.