Abstract: A head-mounted display device including a projection device and an optical waveguide is provided. The projection device has an optical pupil located on a second surface of the optical waveguide, and includes a light source, a first MEMS mirror element, a second MEMS mirror element, and a relay optical element group. The relay optical element group has a first axis equivalent focal length corresponding to a first parallel light beam and has a second axis equivalent focal length corresponding to a second parallel light beam. The first parallel light beam and the second parallel light beam travel along an optical axis of the relay optical element group, and a value of the first axis equivalent focal length is different from a value of the second axis equivalent focal length. The head-mounted display device may provide good image quality and a large field of view.

Abstract: A near-eye light field display device is provided. The near-eye light field display device includes a first lens, a micro-lens array, a second lens, and a display panel. The display panel is adapted to provide an image beam. An eye-side surface of the micro-lens array is provided with a plurality of eye-side micro lenses, and a display-side surface thereof is provided with a plurality of display-side micro lenses. The eye-side micro lenses are arranged equidistantly in a first pitch. The display-side micro lenses are arranged equidistantly in a second pitch. The first pitch is different from the second pitch.

Abstract: An imaging system, including a light valve and a projection lens, is provided. The projection lens has a reduction side and a magnification side, and includes a lens group and a convex mirror. The light valve is configured on the reduction side. The projection lens is configured to image the beam from the light valve on a projection surface, and the projection surface is configured on the magnification side. There is an included angle between the projection surface and a light receiving surface. The lens group is configured on an optical path between the magnification side and the reduction side, and includes first to seventh lens elements sequentially arranged from the magnification side to the reduction side. The refractive powers of the first to seventh lens elements are respectively negative, negative, positive, positive, negative, positive, and positive. The convex mirror is configured on an optical path between the lens group and the magnification side.

Abstract: A head-mounted display including an image generator, a projection lens, and a waveguide is provided. The image generator is configured to provide an image beam. The projection lens is disposed on a path of the image beam. The projection lens has an image side and an object side. The image generator is configured at the image side. The projection lens includes a first lens element and a lens element group. The lens element group is disposed between the image generator and the first lens element. A first central axis of the first lens element and a second central axis of the lens element group are not overlapped. The waveguide is disposed on the path of the image beam and located at the object side of the projection lens.

Abstract: A light field near eye display device including a display element, a micro-lens array, a first lens, and a second lens is provided. The display element provides an image light beam. The micro-lens array is located on a transmission path of the image light beam, and has multiple micro-lenses. The first lens is located on the transmission path of the image light beam, where the micro-lens array is located between the first lens and the display element. The second lens is located on the transmission path of the image light beam, and located between the micro-lens array and the display element.

Abstract: A head-mounted display device including a projection device and an optical waveguide is provided. The projection device has an optical pupil located on a second surface of the optical waveguide, and includes a light source, a first MEMS mirror element, a second MEMS mirror element, and a relay optical element group. The relay optical element group has a first axis equivalent focal length corresponding to a first parallel light beam and has a second axis equivalent focal length corresponding to a second parallel light beam. The first parallel light beam and the second parallel light beam travel along an optical axis of the relay optical element group, and a value of the first axis equivalent focal length is different from a value of the second axis equivalent focal length. The head-mounted display device may provide good image quality and a large field of view.

Abstract: A projection lens includes a first lens group, a second lens group and an aperture stop. The first lens group is disposed between a reduced side and a magnified side. The second lens is disposed between the first lens group and the magnified side. The second lens group has a light incident surface, a reflective surface and a light emitting surface, the light incident surface faces the first lens group, the light emitting surface faces a projection surface, the light incident surface, the light emitting surface and the first lens group are disposed at a single side of the reflective surface, and at least one of the light incident surface, the reflective surface and the light emitting surface is a freeform surface. The aperture stop is disposed between the first lens group and the second lens group. Moreover, a projection apparatus including the projection lens is also provided.

Abstract: An imaging system, including a light valve, a projection surface, and a projection lens, is provided. The projection lens has a reduction side and a magnification side, and includes a lens group and a convex mirror. The light valve is configured on the reduction side. The projection surface is configured on the magnification side. There is an included angle between the projection surface and a light receiving surface. The lens group is configured on an optical path between the magnification side and the reduction side, and includes first to seventh lens elements sequentially arranged from the magnification side to the reduction side. The refractive powers of the first to seventh lens elements are respectively negative, negative, positive, positive, negative, positive, and positive. The convex mirror is configured on an optical path between the lens group and the magnification side. A projection device, including the imaging system, is also provided.

Abstract: A display apparatus includes a display device and an optical element. The display device is configured to project an image beam to a first diaphragm. The optical element is disposed on the transmission path of the image beam. The optical element includes a second diaphragm, the second diaphragm is located on one side of the first diaphragm, and the first diaphragm is located between the second diaphragm and the display device. The area of the second diaphragm approximates the area of the first diaphragm. The image beam passes through the first diaphragm and the second diaphragm and is projected to a projection target.

Abstract: A display apparatus includes a display element, a micro lens array, and a first light shielding element. The display element provides sub-image beams. The micro lens array is located in a transmission path of the sub-image beams, and has optical regions and first connection portions. Each first connecting portion is adapted to connect at least two adjacent optical regions, and each optical region is adapted to allow each sub-image beam to penetrate. The first light shielding element is located between the display element and the micro lens array, and has first light shielding regions and first light transmission regions. Each first light transmission region is disposed corresponding to each optical region and is adapted to allow each sub-image beam to penetrate. Each first light-shielding region is disposed corresponding to each first connecting portion and is adapted to prevent each sub-image beams from passing through each first connecting portion.

Abstract: An optical transmitting module and a head mounted display device are provided. The optical transmitting module includes a waveguide and a first lens. The waveguide is located on a transmission path of an image beam. The waveguide includes a plurality of beam splitters configured to split the image beam the image beam into a first image beam and a second image beam. The second image beam reflected by the beam splitter is outputted from the waveguide, so as to display a virtual image. The first lens causes a plurality of virtual images displayed by a plurality of the second image beams reflected from different beam splitters at the same angle to coincide on a focal plane of the first lens. The head mounted display device can eliminate a ghost image phenomenon that occurs when the user observes the images displayed in a range closer to the eye.

Abstract: A near-eye light field display device is provided. The near-eye light field display device includes a first lens, a micro-lens array, a second lens, and a display panel. The display panel is adapted to provide an image beam. An eye-side surface of the micro-lens array is provided with a plurality of eye-side micro lenses, and a display-side surface thereof is provided with a plurality of display-side micro lenses. The eye-side micro lenses are arranged equidistantly in a first pitch. The display-side micro lenses are arranged equidistantly in a second pitch. The first pitch is different from the second pitch.

Abstract: A near-eye display apparatus is configured to be disposed in front of at least one eye of a user and includes an illumination system, a display device, and a micro-lens array. The illumination system is configured to provide an illumination beam including sub-illumination beams. The display device is located on a transmission path of the illumination beam. The sub-illumination beams form corresponding sub-illumination regions on the display device, and the display device is configured to convert the sub-illumination beams irradiating the display device and corresponding to the sub-illumination regions into sub-image beams. An exit angle of each sub-image beam emitted from the display device is less than or equal to 20 degrees. The near-eye display apparatus provided herein is capable of eliminating stray light and characterized by good quality.

Abstract: A light field near eye display device including a display element, a micro-lens array, a first lens, and a second lens is provided. The display element provides an image light beam. The micro-lens array is located on a transmission path of the image light beam, and has multiple micro-lenses. The first lens is located on the transmission path of the image light beam, where the micro-lens array is located between the first lens and the display element. The second lens is located on the transmission path of the image light beam, and located between the micro-lens array and the display element. The following formulas are satisfied: ? 1 f MLA ? > ? 1 f 1 ? , and ? ? ? 1 f MLA ? > ? 1 f 2 ? , where fMLA is an equivalent focal length of the micro-lenses, f1 is an equivalent focal length of the first lens, and f2 is an equivalent focal length of the second lens.

Abstract: A display device includes a light source, a light-directing element, a reflective display element, and a microlens array. The light-directing element is disposed on the transmission path of a lighting beam provided by the light source for projecting the lighting beam toward the first direction. The reflective display element includes a plurality of micro-image units, wherein each micro-image unit converts the lighting beam projected from the light-directing element into an sub-image beam and reflects the sub-image beam. The microlens array is disposed on the transmission path of the sub-image beams, wherein the light-directing element is located between the microlens array and the reflective display element. The microlens array includes a plurality of microlenses. Each sub-image beam pass throughs the light-directing element and is projected to an aperture by the corresponding microlens, and the sub-image beams pass through the aperture to form an image beam.

Abstract: A display device includes a light source, a light-directing element, a first lens, a microlens array, and a reflective display element. The light-directing element is adapted to project a lighting beam provided by the light source toward an incident direction. The first lens is configured to receive the lighting beam projected by the light-directing element and project the lighting beam toward the incident direction. The first lens is located between the microlens array and the light-directing element. The micro-image units of the reflective display element correspond to the microlenses of the microlens array respectively. Each micro-image unit converts the lighting beam into an sub-image beam and reflect the sub-image beam to the microlens array. Each sub-image beam is projected to the first lens by the corresponding microlens, and the sub-image beams pass through the light-directing element and transmit to an aperture to form an image beam.

Abstract: A light field display apparatus includes a display, a lens array, a plurality of optical devices, and a computing device. The display emits a light field image beam to a projection target. The lens array is disposed on a transmission path of the light field image beam and located between the display and the projection target. The optical devices are disposed on the transmission path of the light field image beam. The computing device is electrically connected to the display to receive an image signal having depth information and convert the image signal having the depth information into a light field image signal. The light field image signal is transmitted to the display. The computing device converts the image signal having the depth information into the light field image signal by an equivalent optical model. A light field display method is also provided.

Abstract: A near-eye light field display device includes a display element, a microlens array and an optical element. The display element has a plurality of micro-image units and each of the plurality of micro-image units is configured to provide an elemental image beam. The microlens array is disposed in front of the display element and has a plurality of microlenses corresponding to the plurality of the micro-image units respectively. The optical element is disposed in front of the microlens array and located on a transmission path of the elemental image beams from the microlenses. An Abbe number of the microlens array is VdMLA, a refractive index of the microlens array is ndMLA, an Abbe number of the optical element is VdOE, a refractive index of the optical element is ndOE, and the microlens array and the optical element meet at least one of: VdOE>VdMLA and ndOE<ndMLA.

Abstract: A light field display apparatus and a method for calibrating a display image thereof are provided. The method for calibrating a display image includes: dividing a display image to generate a plurality of block images; displaying the block images by a display, and passing the block images through a light field device to generate a combination image; providing an image capturer to capture the combination image, and comparing the display image and the combination image to generate error information; receiving user parameters; and adjusting at least one of the block images in the display image according to the user parameters and the error information. Without providing a mechanical adjustment device, the light field display apparatus of the invention can compensate for display errors that may be caused by the device-internal parameters and the user parameters, which not only enhances display quality, but also enhances convenience in use.

Abstract: A display apparatus includes a display element, a micro lens array, and a first light shielding element. The display element provides sub-image beams. The micro lens array is located in a transmission path of the sub-image beams, and has optical regions and first connection portions. Each first connecting portion is adapted to connect at least two adjacent optical regions, and each optical region is adapted to allow each sub-image beam to penetrate. The first light shielding element is located between the display element and the micro lens array, and has first light shielding regions and first light transmission regions. Each first light transmission region is disposed corresponding to each optical region and is adapted to allow each sub-image beam to penetrate. Each first light-shielding region is disposed corresponding to each first connecting portion and is adapted to prevent each sub-image beams from passing through each first connecting portion.