Pixel circuit of display panel and display device

A display device comprising:

• a display panel comprising pixel circuits, and the display panel is configured to display an image;
• a panel driver configured to drive the display panel;
• and
• a processor configured to express grayscales of the image based on at least one from among an amplitude and a duration of a drive current applied to a light emitting element included in the pixel circuits,
• wherein each of the pixel circuits comprises:
• the light emitting element configured to emit light in accordance with the drive current;
• a current source comprising a driving transistor connected to the light emitting element, and the current source is configured to provide the drive current having a different amplitude to the light emitting element in accordance with a level of a voltage applied to a gate terminal of the driving transistor;
• and
• a pulse width control circuit configured to control the duration of the drive current by controlling the voltage applied to the gate terminal of the driving transistor.