a display pixel circuit including a display light-emitting element;

a reference light-emitting element; and

a display driving circuit,

wherein the display pixel circuit is configured to control light emission of the display light-emitting element based on a data signal in accordance with video data,

wherein the reference light-emitting element is precluded from the control in accordance with video data,

wherein the display driving circuit includes a first sample and hold circuit, a second sample and hold circuit, a difference amplifier circuit, a first switch circuit between the reference light-emitting element and the first sample and hold circuit, and a second switch circuit between the display pixel circuit and the second sample and hold circuit, and

wherein the display driving circuit is configured to:

turn on the first switch circuit to acquire a reference signal indicating a current-voltage characteristic of the reference light-emitting element by the first sample and hold circuit,

turn on the second switch circuit to acquire a characteristic signal indicating the current-voltage characteristic of the display light-emitting element by the second sample and hold circuit,

use the difference amplifier circuit to generate a signal indicating a degree of deterioration of the display light-emitting element based on a difference of the characteristic signal from the reference signal, and

adjust brightness of the display light-emitting element based on the degree of deterioration.