The present disclosure relates to a projection device, and more particularly, to a projection device including: a projector module configured to provide an image to a screen; and a lens module between a user's eyes and the screen, wherein the project module includes: a display module configured to provide a certain image; and a backlight module configured to provide light to the display module such that the image provided by the display module is projected on the screen, wherein the display module is between the backlight module and the screen, the display module is configured to induce a convergence reaction on the user's eyes such that the image projected on the screen has a convergence distance, and the lens module is configured to induce a focus reaction on the user's eyes and change a focal length of the image reproduced by the display module within a certain range.

A communication head-up display system includes a communication device and a head-up display. The communication device includes a first controller which determines eye-positions of eyes of a user in at least one direction. The head-up display includes a display panel, an optical element, a reflector. The display panel displays a parallax image. The optical element defines a propagation direction of image light emitted from the parallax image. The reflector reflects the image light whose propagation direction is defined by the optical element. The reflector includes a reflection element and a drive device. The reflection element reflects the image light. The drive device changes at least one of position and posture of the reflection element so that the image light reflected by the reflection element arrives at the eye-positions.

The invention relates to an automatic calibration method for image arrangement of a naked-eye 3D display screen and electronic device. The method comprise: S1, displaying a first 3D test image on a display screen according to a preset viewing distance, and acquiring a mirror image of the first 3D test image in a flat mirror through a camera, wherein the first 3D test image comprises a first monochrome 3D left image and a black 3D right image; S2, adjusting a 3D display rotation angle and a left-right offset of a display screen according to a preset algorithm, acquiring a mirror image and acquiring the number of effective pixel points of the largest pixel block in each mirror image; S3, taking the 3D display rotation angle and the left-right offset corresponding to the mirror image to which the selected maximum effective pixel point number belongs as calibration parameters.

The invention relates to an automatic calibration method for image arrangement of a naked-eye 3D display screen and electronic device. The method comprise: S1, displaying a first 3D test image on a display screen according to a preset viewing distance, and acquiring a mirror image of the first 3D test image in a flat mirror through a camera, wherein the first 3D test image comprises a first monochrome 3D left image and a black 3D right image; S2, adjusting a 3D display rotation angle and a left-right offset of a display screen according to a preset algorithm, acquiring a mirror image and acquiring the number of effective pixel points of the largest pixel block in each mirror image; S3, taking the 3D display rotation angle and the left-right offset corresponding to the mirror image to which the selected maximum effective pixel point number belongs as calibration parameters.

A device for providing a reverse pass-through view of a user of a headset display to an onlooker includes an eyepiece comprising an optical surface configured to provide an image to a user on a first side of the optical surface. The device also includes a first camera configured to collect an image of a portion of a face of the user reflected from the optical surface in a first field of view, a display adjacent to the optical surface and configured to project forward an image of the face of the user, and a screen configured to receive light from the display and provide the image of the face of the user to an onlooker.

A device for providing a reverse pass-through view of a user of a headset display to an onlooker includes an eyepiece comprising an optical surface configured to provide an image to a user on a first side of the optical surface. The device also includes a first camera configured to collect an image of a portion of a face of the user reflected from the optical surface in a first field of view, a display adjacent to the optical surface and configured to project forward an image of the face of the user, and a screen configured to receive light from the display and provide the image of the face of the user to an onlooker.

A display placed in an optical pathway extending from an entrance pupil of a person's eye to a real-world scene beyond the eye. The display includes at least one 2-D added-image source that is addressable to produce a light pattern corresponding to a virtual object. The source is situated to direct the light pattern toward the person's eye to superimpose the virtual object on an image of the real-world scene as perceived by the eye via the optical pathway. An active-optical element is situated between the eye and the added-image source at a location that is optically conjugate to the entrance pupil and at which the active-optical element forms an intermediate image of the light pattern from the added-image source. The active-optical element has variable optical power and is addressable to change its optical power to produce a corresponding change in perceived distance at which the intermediate image is formed, as an added image to the real-world scene, relative to the eye.

A display placed in an optical pathway extending from an entrance pupil of a person's eye to a real-world scene beyond the eye. The display includes at least one 2-D added-image source that is addressable to produce a light pattern corresponding to a virtual object. The source is situated to direct the light pattern toward the person's eye to superimpose the virtual object on an image of the real-world scene as perceived by the eye via the optical pathway. An active-optical element is situated between the eye and the added-image source at a location that is optically conjugate to the entrance pupil and at which the active-optical element forms an intermediate image of the light pattern from the added-image source. The active-optical element has variable optical power and is addressable to change its optical power to produce a corresponding change in perceived distance at which the intermediate image is formed, as an added image to the real-world scene, relative to the eye.

An image display apparatus of the present invention includes: a beam emitting section (10) that radially emits a plurality of beams (Ls1 to Ls5) in a horizontal direction; a mirror rotary member (20) having a rotation axis (Pc) and an inner surface, the inner surface having a plurality of mirror surfaces (21) that reflects each of the plurality of beams (Ls1 to Ls5), the mirror rotary member as a whole rotating about the rotation axis (Pc) as a center to thereby perform, by the plurality of mirror surfaces (21), scanning with each of the plurality of beams (Ls1 to Ls5) emitted from the beam emitting section (10) in the horizontal direction; and a screen (2) to be irradiated with the plurality of beams (Ls1 to Ls5) with which the scanning is performed by the plurality of mirror surfaces (21).

An image display apparatus of the present invention includes: a beam emitting section (10) that radially emits a plurality of beams (Ls1 to Ls5) in a horizontal direction; a mirror rotary member (20) having a rotation axis (Pc) and an inner surface, the inner surface having a plurality of mirror surfaces (21) that reflects each of the plurality of beams (Ls1 to Ls5), the mirror rotary member as a whole rotating about the rotation axis (Pc) as a center to thereby perform, by the plurality of mirror surfaces (21), scanning with each of the plurality of beams (Ls1 to Ls5) emitted from the beam emitting section (10) in the horizontal direction; and a screen (2) to be irradiated with the plurality of beams (Ls1 to Ls5) with which the scanning is performed by the plurality of mirror surfaces (21).