Display device and electronic device including the same

A display device comprising:

• a display panel including light emitting pixels and light sensing pixels, each of the light emitting pixels including a light emitting element and each of the light sensing pixels including a photoelectric conversion element;
• and
• a readout circuit connected to the light sensing pixels through readout lines and configured to generate a photoplethysmography (PPG) signal based on sensing currents received from the light sensing pixels in a PPG sensing mode, and wherein in the PPG sensing mode,
• one or more of the light emitting pixels in a sensing light emitting area are turned on, one or more of the light sensing pixels in the sensing light emitting area are turned off, and reflected light, which is emitted from the sensing light emitting area and reflected from a blood vessel of a finger of a user, is incident on a partial area of the display panel,
• in a first sensing area where the reflected light is incident, one or more of the light emitting pixels are turned off and one or more of the light sensing pixels are turned on, and
• in a second sensing area where the reflected light is not incident, one or more of the light emitting pixels are turned off and one or more of the light sensing pixels are turned on.

A display device comprising:

• a first pixel to emit light reflected by a finger of a user;
• a light sensing pixel at a position to sense the reflected light;
• a second pixel at a position that does not sense the reflected light;
• a sensing circuit to generate a first sensing signal based on a sensing current output from the light sensing pixel and to generate a noise signal based on a sensing current output from the second pixel, and
• a noise eliminator to subtract the noise signal from the first sensing signal to generate a biological signal of the user,
• wherein the finger overlaps the first pixel and the second pixel and the light sensing pixel.

An electronic device comprising:

• a display device;
• and
• a power supply configured to provide power to the display device,
• wherein the display device comprises:
• a display panel including light emitting pixels and light sensing pixels, each of the light emitting pixels including a light emitting element and each of the light sensing pixels including a photoelectric conversion element;
• and
• a readout circuit connected to the light sensing pixels through readout lines,
• wherein, in a photoplethysmography (PPG) sensing mode, the readout circuit is configured to receive first sensing current from one or more of the light sensing pixels in a first sensing area adjacent to a sensing light emitting area that is configured to emit light, receive second sensing current from one or more of the light sensing pixels in at least one second sensing area spaced from the first sensing area, and generate a PPG signal based on the first sensing current and the second sensing current,
• wherein, in the PPG sensing mode, the first sensing area includes light emitting pixels that are configured to be turned off and light sensing pixels that are configured to be turned on,
• wherein, in the PPG sensing mode, the at least one second sensing area includes light emitting pixels that are configured to be turned off and light sensing pixels that are configured to be turned on.