Abstract:
An image illumination apparatus for backlighting a portion of a liquid crystal display. The apparatus includes a light source generating an illuminating light, a light shielding medium located between the light source and a display grid, and an aperture formed in the light shielding medium for allowing the transmission of light generated by the light source to pass to a lighted portion of the display grid. The light shielding medium prevents light from being transmitted to a non-lighted portion of the display grid.
Abstract:
An optical unit (20, 30) for color projection display system that has three SLMs (21, 31) and three projection lenses (27, 37). Each SLM (21, 31) receives light of a different primary color, which it modulates to form images for that color. Each SLM (21, 31) and its associated projection lens (27, 37) provides a “channel” for that color of the final image, with the channels being converged out of the projection lenses (27, 37) to the viewing screen.
Abstract:
In an image observation apparatus, image light is guided to an observer's eye by using a first refractive surface on which the image light from an image display device is made incident, a reflective surface for reflecting the image light made incident from the first refractive surface, and an optical element having a second refractive surface for emitting the image light reflected from the reflective surface. A diffraction optical part is provided in front of the reflective surface of the optical element.
Abstract:
A head-up display (HUD) uses reduced reflectivity projection optics to reduce the harmful effects of intense solar radiation on HUD components. In a HUD generally having a display, a mirror, and a combiner, an image is projected from the display to the combiner via the mirror. The reflectance of the mirror is reduced to prevent high thermal stress on HUD components. The light source is brighter than a conventional backlight, and thus compensates for the reduction in the reflectance of the mirror. Reduced mirror reflectance translates into a reduced thermal load on the display, lens, case, electronics, or wherever the solar radiation is directed.
Abstract:
A head-mounted optical apparatus (10) providing pupil imaging with a very wide field of view. The head-mounted optical apparatus (10) employs a monocentric arrangement of optical components providing stereoscopic display of a virtual image, electronically generated and projected as left and right images from curved surfaces (68). For each right and left image, a ball lens assembly (30) is used to project a displayed intermediate image from the curved display surface (68) toward a beamsplitter (16), which directs an intermediate image toward the front focal surface of a curved mirror (24) that collimates the image to form a virtual image. The beamsplitter (16) transmits the virtual image for each eye to the observer.
Abstract:
An image display apparatus allows an image from a single image display device to be led to two eyes without using a half-mirror, thereby allowing observation of a bright image, and facilitates correction of various aberrations. A viewing optical system includes a left ocular part, a right ocular part, and an optical path distributing part for leading a light beam from a single image display device to the left and right ocular parts. The left and right ocular parts each have at least two reflecting surfaces. The optical path distributing part has at least one pair of reflecting surfaces for left and right optical paths. These reflecting surfaces are formed from rotationally asymmetric curved reflecting surfaces having the function of correcting decentration aberrations. The left and right optical paths of the viewing optical system are formed by optical surfaces arranged so that the left and right optical paths are not in plane symmetry with each other but in 180-degree rotational symmetry with respect to only a normal line passing through the center of the image display device.
Abstract:
An image display apparatus has a reflective display device, an illumination optical system with a reflective surface A for guiding light from a light source to the display device, and a display optical system for guiding light from the display device to an observer's observation position and is constructed to permit an observer to observe image information displayed on the display device. The image display apparatus is constructed in appropriate setting of principal rays emerging from a display surface of the display device and impinging upon the center of the exit pupil, illumination principal rays emerging from the light source and guided to the display surface by the illumination optical system to become principal rays, angles of incidence and emergence of the illumination principal rays and the principal rays to and from the display surface, an angle between the reflective surface A and the display surface, angles of incidence of the illumination principal rays to the reflective surface A, and so on.
Abstract:
The present invention is an apparatus for monocular head displays, which enables a compact, light in weight, sturdy apparatus that has a wide angle of viewing, a bright and sharp image display that operates on low voltage in a wide range of temperatures. The image is bright and high in contrast. Due to the compactiveness and wide viewing angle, it is readily useable inside helmets and goggles and visors. The signals that can be used include data, maps, graphics or video images including infrared or other images. Because of the wide viewing angle, the module may be placed and adjusted for multiple users and field installation.
Abstract:
A display device for a display wavelength range includes an image source, a relay group made of optical elements transparent to the display wavelength range, and a reflective combiner in facing relation to the relay group. The relay group includes a glass optical wedge, a glass lens, and a group of plastic lenses including a diffractive optical element. The group of plastic lenses is positioned between the glass optical wedge and the glass lens. The relay group has the optical wedge having a front face in facing relation to the image source, and a back face; an aspheric lens module having a front face in facing relation to the back face of the optical wedge, and a back face; and an aspheric lens having a front face in facing relation to the back face of the aspheric lens module, a back face, and an optical axis. The aspheric lens module is tilted and decentered with respect to the optical axis of the aspheric lens. The relay group further includes a diffractive-optical-element lens module having a front face in facing relation to the back face of the aspheric lens, and a back face; and a positive-power lens module having a front face in facing relation to the back face of the diffractive-optical-element lens module, and a back face.
Abstract:
A head-up display system (10) incorporates a combiner (16) which is movable to a stowed (i.e., out-of-use) position by rotation about an axis (C) in or parallel to the plane of image projection.