An observation optical system includes a display element and an eyepiece lens arranged on an eyepoint side of the display element. The eyepiece lens includes at least one negative lens. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens is denoted by f, the observation optical system satisfies a conditional expression represented by 0.35<H/f<0.6.

Disclosed is an eyepiece optical system with a large field-of-view angle, and a head-mounted display apparatus. The eyepiece optical system comprises a first lens group (G1) and a second lens group (G2) which are arranged coaxially and successively along an optical axis from a human eye to an image source and meet a certain focal length relationship. A distance (D12) between the first lens (L1) and the second lens (L2), a focal length relationship of lenses within the second lens group (G2) and the material properties of various lenses meet a certain relationship. The eyepiece optical system has the advantages of large aperture, large field-of-view, high resolution, low distortion, and small size, etc., and is suitable for a head-mounted display and similar apparatuses.

Disclosed is an eyepiece optical system with a large field-of-view angle, and a head-mounted display apparatus. The eyepiece optical system comprises a first lens group (G1) and a second lens group (G2) which are arranged coaxially and successively along an optical axis from a human eye to an image source and meet a certain focal length relationship. A distance (D12) between the first lens (L1) and the second lens (L2), a focal length relationship of lenses within the second lens group (G2) and the material properties of various lenses meet a certain relationship. The eyepiece optical system has the advantages of large aperture, large field-of-view, high resolution, low distortion, and small size, etc., and is suitable for a head-mounted display and similar apparatuses.

The invention relates to personal display devices and in particular an eyepiece therefor. The eyepiece is adapted for projecting an image from an image plane on one side of the eyepiece through an exit pupil on the opposite side of the eyepiece and comprises at least one stationary lens group and at least two movable lens groups being movable with respect to the stationary lens group along an optical axis between the image plane and the exit pupil. According to the invention, the lens groups are arranged in positive-negative-positive configuration and the movable lens groups are arranged to move along the optical axis between a first state providing a first field-of-view and a second state providing a second field-of-view smaller than the first field-of-view to the image plane. The invention allows for improving optical performance and user experience of personal display devices.

The invention relates to personal display devices and in particular an eyepiece therefor. The eyepiece is adapted for projecting an image from an image plane on one side of the eyepiece through an exit pupil on the opposite side of the eyepiece and comprises at least one stationary lens group and at least two movable lens groups being movable with respect to the stationary lens group along an optical axis between the image plane and the exit pupil. According to the invention, the lens groups are arranged in positive-negative-positive configuration and the movable lens groups are arranged to move along the optical axis between a first state providing a first field-of-view and a second state providing a second field-of-view smaller than the first field-of-view to the image plane. The invention allows for improving optical performance and user experience of personal display devices.

An ocular optical system includes a first lens element and a second lens element from an eye-side to a display-side in order along an optical axis. The first lens element and the second lens element each include an eye-side surface and a display-side surface. The display-side surface of the second lens element has a concave portion in a vicinity of a periphery thereof. The ocular optical system satisfies 2.000≤G2D/T1 and ER/G12≤20.000, wherein G2D is a distance from the second lens element to the display screen along the optical axis, T1 is a thickness of the first lens element along the optical axis, ER is a distance from a pupil of the eye of the observer to the first lens element along the optical axis, and G12 is an air gap from the first lens element to the second lens element along the optical axis.

An ocular optical system includes a first lens element and a second lens element from an eye-side to a display-side in order along an optical axis. The first lens element and the second lens element each include an eye-side surface and a display-side surface. The display-side surface of the second lens element has a concave portion in a vicinity of a periphery thereof. The ocular optical system satisfies 2.000≤G2D/T1 and ER/G12≤20.000, wherein G2D is a distance from the second lens element to the display screen along the optical axis, T1 is a thickness of the first lens element along the optical axis, ER is a distance from a pupil of the eye of the observer to the first lens element along the optical axis, and G12 is an air gap from the first lens element to the second lens element along the optical axis.

Systems and methods are described for a wide field of view (WFOV) optical doublet system. The system includes a first lens. The first lens has a first surface facing a viewer side of the system and a second surface facing away from the viewer side. The first lens has a positive refractive power. The system includes a second lens. The second lens has a first surface facing the first lens and a second surface facing away from the first lens. The second lens has a positive refractive power. The system includes a display panel. The display panel has a display surface facing the second surface of the second lens. The first lens, the second lens, and the display panel are configured in order from the viewer side along an optical axis of the system. Only one surface of either the first lens or the second lens is a diffractive surface and only two surfaces are Fresnel surfaces. In operation, light from an image displayed on the display surface enters the system through the second surface of the second lens and is magnified and presented in a system exit pupil. The system exit pupil is on the viewer side and a field of view presented to the viewer is at least eighty (80) degrees.

Systems and methods are described for a wide field of view (WFOV) optical doublet system. The system includes a first lens. The first lens has a first surface facing a viewer side of the system and a second surface facing away from the viewer side. The first lens has a positive refractive power. The system includes a second lens. The second lens has a first surface facing the first lens and a second surface facing away from the first lens. The second lens has a positive refractive power. The system includes a display panel. The display panel has a display surface facing the second surface of the second lens. The first lens, the second lens, and the display panel are configured in order from the viewer side along an optical axis of the system. Only one surface of either the first lens or the second lens is a diffractive surface and only two surfaces are Fresnel surfaces. In operation, light from an image displayed on the display surface enters the system through the second surface of the second lens and is magnified and presented in a system exit pupil. The system exit pupil is on the viewer side and a field of view presented to the viewer is at least eighty (80) degrees.

The present invention relates to an eyepiece optical system and device with a large field-of-view angle and high image quality, comprising a first lens group and a second lens group arranged successively along an optical axis from a human eye observing side to a micro display. The first lens group is composed of one or more lenses, and the second lens group comprises a Fresnel lens. The Fresnel lens comprises a Fresnel surface. By the use of a combination of a novel optical surface shape, i.e., the Fresnel surface shape, and traditional optical spherical and aspherical surface shapes, when focal lengths of various lenses and lens groups meet particular conditions, significant elimination of system aberration, reduction of the sensitivity of various optical components, and easy processing and assembly of the components can be achieved.