Abstract: An augmented reality display device configured to be disposed on a head of a user includes a display, a relay lens set, a beam splitting module, and a curved mirror. The display is configured to emit an image beam. The relay lens set is disposed on a path of the image beam. The beam splitting module is disposed on a path of the image beam from the relay lens set. The curved mirror is configured to reflect the image beam from the beam splitting module back to the beam splitting module. The image beam reflected by the curved mirror penetrates through the beam splitting module and is then transmitted to a pupil of the user. The beam splitting module includes a polarizer, a brightness enhancement film, and a phase retardation film stacked together in sequence from a side adjacent to the pupil to a side adjacent to the curved mirror.

Abstract: An ocular optical system configured to allow imaging rays from a display image to enter an observer's eye through the ocular optical system so as to form an image is provided. A direction toward the eye is an eye side, and a direction toward the display image is a display side. The ocular optical system includes a first lens element, a second lens element, and a third lens element arranged along an optical axis in sequence from the eye side to the display side. Each of the first to third lens elements has an eye-side surface and a display-side surface. The ocular optical system satisfies: 0<f/f1+f/f2+f/f3<0.35, where f is an effective focal length of the ocular optical system, f1 is a focal length of the first lens element, f2 is a focal length of the second lens element, and f3 is a focal length of the third lens element.

Abstract: An ocular optical system configured to allow imaging rays from a display image to enter an observer's eye through the ocular optical system so as to form an image is provided. A direction toward the eye is an eye side, and a direction toward the display image is a display side. The ocular optical system includes a first lens element, a second lens element, and a third lens element arranged along an optical axis in sequence from the eye side to the display side. Each of the first to third lens elements has an eye-side surface and a display-side surface. The ocular optical system satisfies: 0<f/f1+f/f2+f/f3<0.35, where f is an effective focal length of the ocular optical system, f1 is a focal length of the first lens element, f2 is a focal length of the second lens element, and f3 is a focal length of the third lens element.