32results about How to "Large exit pupil diameter" patented technology

Provided are a near-eye display system, virtual-reality device, and augmented-reality device. A near-eye display system comprises a laser light source (261), a beam-splitting component (262), a scanning optical-fiber array (263), and a first concave reflector (264); the beam-splitting component (262) comprises a number M*N of output terminals; each output terminal is provided with an optical switch; the scanning optical-fiber array (263) comprises a number M*N of optical fibers; the M*N optical fibers are respectively connected to the M*N output terminals; M and N are positive integers greater than or equal to 2; when passing through the beam-splitting component (262), the laser light emitted by the laser light source (261) is split into M*N light beams; a light beam outputted from the output terminal corresponding to an optical switch in an activated state on the beam-splitting component (262) passes through the scanning optical-fiber array (263), and is then reflected into the human eye by the first concave reflector (264). The light beam outputted by each optical fiber is conical, therefore the width of the light beam increases continuously with an increase in the optical path; thus the exit-pupil diameter of the near-eye display system is increased and the strict limitations on the position of the eye during observation are reduced or avoided.

The invention discloses a visual optical system and a head-mounted display device. The visual optical system comprises a fifth lens, a fourth lens, a third lens, a second lens and a first lens which are sequentially arranged along a light incidence direction, and is characterized in that the first lens is a biconvex lens with positive focal power, the second lens is a meniscus-shaped lens with negative focal power, the third lens is a biconvex lens with positive focal power, the fourth lens is a biconvex lens with positive focal power, and the fifth lens is a meniscus-shaped lens with negative focal power. The advantages lie in that the visual optical system has the characteristics of light weight, compact structure, large exit pupil diameter and exit pupil distance, improvement in user experience, excellent imaging quality, high resolution and the like through controlling arrangement of concave-convex surfaces of the lenses, being complemented by other optical relation expressions to control related parameters and using glass and plastic lenses in a matched manner.

The invention discloses an optical system applicable to virtual reality equipment. The optical system applicable to the virtual reality equipment comprises a diaphragm, a positive focal power lens, anegative focal power lens and an image displayer in sequence in the optical axis direction; the positive focal power lens is used for inhibiting ray divergence angles which are incident from a big field angle, and the negative focal power lens is used for balancing astigmatism and distortion generated by the positive focal power lens. The two lenses are both made from a plastic material, the positive focal power lens is a low-refractive-index and high-dispersion-coefficient lens, the negative focal power lens is a high-refractive-index and low-dispersion-coefficient lens, and the combination of the two lenses can reduce chromatic aberration of the optical system. The optical system applicable to the virtual reality equipment is large in field angle, a single-eye diagonal field angle can reach 100 degrees, and thus good immersion sense is provided for the virtual reality equipment; good image quality and distortion are also obtained at an edge field lens set, and meanwhile, the lens sethas a large exit pupil distance and exit pupil aperture, which can provide more comfortable wearing experience for observers.

A waveguide display system and method are provided. The system includes: an image source, used to generate an imaging beam; a relay collimation system, used to collimate the imaging beam into a first parallel light at the same angle; a coupler, used to collimate the first parallel light Coupled into the following waveguide to form the second parallel light; the waveguide is used to propagate the second parallel light to the following coupler in the form of total reflection; the coupler is used to diffract the second parallel light into converging the light, leaving the waveguide, and entering the following first polarization grating; the first polarization grating is used to divide the converged light into two beams of circularly polarized light with opposite rotation directions emerging at different angles; and the second polarization Two beams of circularly polarized light with opposite rotation directions are diffracted by the second polarization grating to produce two beams of laterally misaligned imaging beams and enter the eye. The system has a simple structure, and while realizing the retinal display, the diameter of the exit pupil is enlarged, and the external real scene can be viewed.

The invention provides an exit pupil-expanding compact type nano-structure waveguide display method and an exit pupil-expanding compact type nano-structure waveguide display system. The method comprises the following steps: a microdisplay clings to one side of the waveguide to emit scattered beams, and the scattered beams enter the waveguide and are irradiated on an incident coupling diffraction component arranged on one side of the waveguide and clings to the inclined surface of the waveguide; the incident coupling diffraction component modulates the scattered beams to generate parallel beamsto be propagated in the waveguide in a total reflection mode; and when the parallel beams in the light waveguide are transmitted to an emergent coupling diffraction component arranged on the other side, the emergent coupling diffraction component modulates the parallel beams to generate parallel output light to depart from the waveguide. According to the method provided by the invention, a collimating device between the microdisplay and the waveguide is removed, so the structure required by waveguide display is simplified; meanwhile, one incline surface is arranged at one end of the waveguideand the incident coupling diffraction component is arranged on the inclined surface, so that the diffraction efficiency and the field angle of the display system are improved and the exit pupil diameter is enlarged.