Display device and controlling method thereof

A display device comprising:

• a pixel having a first light emitting element and a first transistor which is connected to the first light emitting element;
• a monitoring element having a second light emitting element and a second transistor which is connected to the second light emitting element;
• and
• a power source voltage controller configured to set a voltage between a source and a drain of the first transistor and a voltage between a source and a drain of the second transistor in a vicinity of a boundary between a saturation region and a linear region.

A display device comprising:

• a pixel having a first light emitting element and a first transistor which is connected to the first light emitting element;
• a monitoring element having a second light emitting element and a second transistor which is connected to the second light emitting element;
• and
• a power source voltage controller configured to set a voltage between a source and a drain of the first transistor in a vicinity of a boundary between a saturation region and a linear region by modifying the voltage between a source and a drain of the second transistor to be a constant value.

A display device comprising:

• a pixel having a first transistor and a first light emitting element, wherein a first electrode of the first transistor and a first electrode of the first light emitting element are connected;
• a monitoring element having a second transistor and a second light emitting element, wherein a first electrode of the second transistor and a second electrode of the second light emitting element are connected;
• and
• a power source voltage controller;
• wherein an input terminal of the power source voltage controller is connected to the first electrode of the second transistor electrically;
• and
• wherein an output terminal of the power source voltage controller is connected to a second electrode of the first light emitting element and the second electrode of the second light emitting element electrically.

A control method of a display device comprising:

• a pixel having a first light emitting element and a first transistor which is connected to the first light emitting element;
• a monitoring element having a second light emitting element and a second transistor which is connected to the second light emitting element;
• and
• a power source voltage controller which is connected to the pixel and the monitoring element,
• wherein the power source voltage controller decides voltages between a source and a drain of each of the first transistor and the second transistor.

A control method of a display device comprising:

• a pixel having a first light emitting element and a first transistor which is connected to the first light emitting element;
• a monitoring element having a second light emitting element and a second transistor which is connected to the second light emitting element;
• and
• a power source voltage controller which is connected to the pixel and the monitoring element,
• wherein the power source voltage controller sets voltages between a source and a drain of each of the first transistor and the second transistor in a vicinity of a boundary between a saturation region and a linear region.

A control method of a display device comprising:

• a pixel having a first transistor and a first light emitting element, wherein a first electrode of the first transistor and a first electrode of the first light emitting element are connected;
• a monitoring element having a second transistor and a second light emitting element, wherein a first electrode of the second transistor and a second electrode of the second light emitting element are connected;
• and
• a power source voltage controller,
• wherein an inverted input terminal of the power source voltage controller is connected to the first electrode of the second transistor electrically;
• wherein an output terminal of the power source voltage controller is connected to a second electrode of the first light emitting element and the second electrode of the second light emitting element electrically;
• and
• wherein a voltage between a source and a drain of the second transistor is controlled to set the voltage between a source and a drain of the first transistor in a vicinity of a boundary between a saturation region and a linear region.