Light-emitting element and display device

A light-emitting element including a first electrode, a second electrode, and a functional layer provided between the first electrode and the second electrode, the light-emitting element comprising:

• a third electrode provided to the functional layer through a first insulating film;
• a fourth electrode provided to the functional layer through a second insulating film;
• and
• a stress applying unit made of a piezoelectric material, and configured to apply stress to the functional layer in response to an application of a voltage to the third electrode and the fourth electrode, wherein:
• at least one of the third electrode or the fourth electrode is provided with an opening,
• the functional layer includes:
• a light-emitting layer,
• a first charge-transport layer provided between the first electrode and the light-emitting layer, and
• a second charge-transport layer provided between the second electrode and the light-emitting layer,
• the second electrode is provided above the second charge-transport layer, and
• the third electrode and the fourth electrode are, respectively, in contact with the first insulating film and the second insulating film that are provided above the second charge-transport layer, such that the third electrode and the fourth electrode sandwich the second electrode.

A light-emitting element including a first electrode, a second electrode, and a functional layer provided between the first electrode and the second electrode, the light-emitting element comprising:

• a third electrode provided to the functional layer through a first insulating film;
• a fourth electrode provided to the functional layer through a second insulating film;
• a stress applying unit made of a piezoelectric material, and configured to apply stress to the functional layer in response to an application of a voltage to the third electrode and the fourth electrode;
• and
• a bank shaped into a frame and surrounding the functional layer, wherein:
• at least one of the third electrode or the fourth electrode is provided with an opening, and
• the third electrode, the fourth electrode, and the stress applying unit are provided within the bank.