Display device, display module, and electronic device

A display device comprising:

• a pixel comprising:
• a liquid crystal element which comprises a reflective electrode comprising an opening;
• a first pixel circuit configured to drive the liquid crystal element;
• a light-emitting element which overlaps with the opening and is configured to emit light through the opening;
• and
• a second pixel circuit configured to drive the light-emitting element;
• and
• a driver circuit comprising:
• a first buffer amplifier for the liquid crystal element;
• and
• a second buffer amplifier for the light-emitting element,
• wherein each of the first buffer amplifier and the second buffer amplifier comprises a first transistor and a switch electrically connected to a gate of the first transistor,
• wherein an operation of the first buffer amplifier and an operation of the second buffer amplifier are configured to be alternately stopped using the switch, and
• wherein each of the first pixel circuit and the second pixel circuit comprises a second transistor comprising an oxide semiconductor layer.

A display device comprising:

• a pixel comprising:
• a liquid crystal element which comprises a reflective electrode comprising an opening and is configured to display a grayscale image by reflecting external light;
• a first pixel circuit configured to drive the liquid crystal element;
• a light-emitting element configured to display a grayscale image by emitting light through the opening;
• and
• a second pixel circuit configured to drive the light-emitting element;
• a driver circuit comprising:
• a first buffer amplifier configured to output a grayscale voltage to the liquid crystal element;
• and
• a second buffer amplifier configured to output a grayscale voltage to the light-emitting element;
• and
• a switching control circuit,
• wherein each of the first buffer amplifier and the second buffer amplifier comprises a first transistor configured to supply a bias current, and a switch between a wiring for supplying a bias voltage and a gate of the first transistor, and
• wherein the switching control circuit is configured to output a switching signal for controlling a conduction state of the switch.