Display apparatus and electronic system

An electronic system, comprising:

• a backlight module, comprising:
• a reflector, comprising a first portion and a second portion outside the first portion, wherein the first portion of the reflector has an opening;
• at least one light emitting element, located on the reflector;
• and
• at least one optical film, located above the reflector, wherein a first direction is perpendicular to the at least one optical film, there is a first distance between the first portion of the reflector and the at least one optical film in the first direction, there is a second distance between the second portion of the reflector and the at least one optical film in the first direction, and the first distance is less than the second distance;
• a display panel, disposed on the backlight module;
• a image sensor, disposed corresponding to the opening of the first portion of the reflector;
• and
• a processing element, electrically connected to the image sensor.