Abstract:
Apparatus and method embodiments are provided for implementing a wavelength selective switch (WSS). The embodiments use combinations of switchable polarization grating (SPG) and LC cells and combinations of polymer polarization grating (PPG) and LC cells to achieve Ι ×Ν WSS systems. An embodiment optical switch includes a liquid crystal cell and a SPG cell adjacent to the liquid crystal cell. The SPG includes liquid crystal material between two photo-alignment layers, an electrode layer overlying each photo-alignment layer, and a glass substrate overlying each electrode layer. An embodiment method includes polarizing an incident light beam at a circular polarization before diffracting, at a polarization grating, the polarized incident light beam in a determined angle that corresponds to a diffraction order in accordance to the circular polarization of the incident light beam and a hologram pattern direction formed inside the polarization grating.
Abstract:
An imager comprising a detector (14) having at least one element sensitive to radiation having a first polarisation and at least one element sensitive to radiation having a second polarisation and means for simultaneously directing (12) from the same scene or point of a scene radiation of the first polarisation onto the first polarisation element and radiation of the second polarisation onto the second polarisation element. Preferably, the detector (14) consists of a two dimensional array of elements.
Abstract:
According to an embodiment, a display system includes an angle-mapped display engine operable to launch angle -mapped image -bearing rays through an image-guiding substrate (102) for display. According to an embodiment, a display system includes and image-guiding substrate (102) with input and/or output structures configured to improve image quality. According to an embodiment, a display system includes structures operable to provide an image guided substrate (102) configuration adapted to an application.
Abstract:
Described are illumination systems whereby light spectra from multiple LEDs of various colors can be combined and polarized with minimal components, while substantially reducing the losses for the combining and polarizing. The described systems and methods use polarizing beam sputters (PBSs) with retarder stack filters to combine color and split polarization for mixed light beams in one step, and to ultimately align the polarizations of the several colored light beams.
Abstract:
An anisotropically etched prism assembly including a device portion (5904), a light coupling portion (5110) and an alignment portion (5106). The anisotropically etched prism assembly having a plurality of optical devices arranged in a first fixed pattern. Each pair of said plurality of optical devices spaced a first prescribed distance apart. The light coupling portion (5110) including a plurality of anisotropically etched prisms arranged in a second fixed pattern so as to correspond with a respective one of the plurality of optical devices. Each one of the pairs of said plurality of anisotropically etched prisms are spaced a second prescribed distance apart, the second prescribed distance substantially equals the first prescribed distance. The alignment portion (5106) aligns the light coupling portion and the device portion.
Abstract:
A technique is provided that allows easy change of projector design. A projector comprises a lighting optical system, an optical modulation device, a projection optical system, and a base frame for mounting a plurality of optical parts disposed in an optical path extending from the lighting optical system to the projection optical system. The lighting optical system (300) comprises a light source (20), a lens array (320), and a superposed lens system (370). In addition, the base frame includes a positioning section for positioning the superposed lens system (370). The superposed lens system (370) includes at least two lenses (371, 372). Disposed in the position closest to the light source is the first lens (371) for mainly determining the F number of the lighting optical system, and disposed in the position farthest from the light source is the second lens (372) for mainly determining the magnification of the lighting optical system.
Abstract:
An illumination engine for a projection display using a TLP including a reflector having a first focal point and second focal points. A source of electro-magnetic radiation disposed proximate to the first focal point of the reflector emits rays of radiation that reflect from the reflector toward the second focal point. A TLP collects and transmits substantially all of the radiation converged at the second focal point, adjusting the numerical aperture of the radiation, but curving the surface formed by the images of the radiation. A SLP or a lens collects and transmits substantially all of the radiation transmitted by the TLP, flattening the surface formed by the images of the radiation. A condenser lens collects and transmits substantially all of the radiation transmitted by the contoured delay element to a PBS and a projection system.
Abstract:
A projection device comprising at least one light source, at least one light-modulation panel preceding the light source, and polarization-separating means arranged between said light source and said light-modulation panel for separating light from the light source into first and second light beams having a first and a second direction of polarization, respectively. The projection device also comprises first and second integrator plates comprising lens elements which are arranged between said polarization-separating means and said light-modulation panel, and polarization-converting means arranged opposite the second integrator plate. Each lens element of the second integrator plate includes a first portion on which a first light beam is projected by the first integrator plate, and a juxtaposed, second portion, on which a second light beam is projected. The polarization-converting means are arranged at least opposite said first portions.