Virtual reality display apparatus

A virtual reality (VR) display apparatus, comprising:

• at least one display, configured to provide an image beam to a user's left eye or right eye;
• and
• at least one optical assembly, disposed on a transmission path of the image beam, and between the display and the user's left eye or right eye, wherein the optical assembly comprises a first Fresnel lens, the first Fresnel lens comprises a plurality of ring structures surrounding an optical axis thereof, each of the ring structures has an effective refraction surface and an optically non-effective surface connected to the effective refraction surface and disposed between the optical axis and the effective refraction surface,
• wherein inclined angles of optically non-effective surfaces of the ring structures, with respect to the optical axis, increase in a direction from the optical axis toward a peripheral area of the first Fresnel lens, so that an average inclined angle of optically non-effective surfaces in a central area of the first Fresnel lens inclined with respect to the optical axis is smaller than an average inclined angle of optically non-effective surfaces in the peripheral area of the first Fresnel lens inclined with respect to the optical axis.