Light-emitting structure, display apparatus, and control method therefor

A display apparatus, comprising:

• a display screen and a light-emitting structure, wherein the display screen is disposed on one side of the light guide member close to the reflective surface;
• and
• the light-emitting structure comprises:
• a light guide member, wherein the light guide member is ring-shaped and has a light-emitting surface and a reflective surface that are opposite to each other in a thickness direction, the reflective surface having an arc-surfaced region;
• the light guide member is further provided with a mounting groove that is on one side of the arc-surfaced region in a radial direction of the light guide member and extends in a circumferential direction of the light guide member;
• and a thickness of the light guide member in the arc-surfaced region decreases progressively in a direction away from the mounting groove;
• and
• a light source, disposed in the mounting groove, wherein a light-emitting side of the light source faces the arc-surfaced region.