397 results about "Liquid crystal on silicon" patented technology

Electrically controlled volume phase gratings and electrically controlled Bragg Gratings can provide variable diffraction gratings that can be operated in a transmissive and / or reflective mode. They can be made from electro-optic materials placed directly on glass or semiconductor materials, utilizing conventional Liquid Crystal on Silicon (LCOS) processes and equipment. Highly efficient and / or small device form factors may be provided.

The invention is directed to systems, methods and computer program products for gaze tracking. An exemplary method includes directing light into an eye using a projector; detecting, using an image-capturing module, a reflection from a surface associated with the eye; and determining a line of sight associated with the eye based on the detected reflection. In some embodiments, the light comprises infra-red light. In some embodiments, the projector comprises a laser. In some embodiments, the projector comprises a liquid crystal on silicon (LCoS) chip. In some embodiments, the surface associated with the reflection is at least one of the cornea, the iris, or the retina.

The present invention relates to trim retarders used to compensate for residual birefringence created by liquid crystal display panels. In particular the present invention relates to a trim retarder with negative out-of-plane birefringence provided by a form birefringent multi-layer dielectric stack for compensating for retardances resulting from liquid crystal on silicon display panels.

A lamp in a color management system provides light to a color wheel having color filter segments that transmit light having a secondary color, namely cyan, magenta, and yellow. A light integrator with a polarizing element, such as a polarization converter or polarizing filter, provides a beam of the secondary color. A primary color separator, such as second color wheel, transflective dichroic beamsplitter, or color-sensitive polarizing switch in combination with an input polarizing beamsplitter, separates the secondary color beam into a first polarized primary color beam and a second polarized primary color beam, which are directed to first and second imager panels. A beam combiner combines the first polarized primary color beam from the first imager and the second polarized primary color beam from the second imager to form a projection beam.

A projection display system employs one or more color modifying aperture stops, such as apodizing aperture stops, to provide high contrast, balanced color and high throughput. One projection system includes a reflective liquid crystal-on-silicon light valve positioned with a polarizing beam splitter, such as a wire grid polarizing beam splitter, for each of the primary color component light paths to separately impart image information into each of the primary color components of light. A color combiner receives and combines the primary color components of light with imparted image information to provide light representing a polychromatic display image. At least one aperture stop is positioned along at least one of the primary color component light paths to balance relative intensities of the primary color components of light.

The invention discloses a lamp optical system with an integrated area light source module for projected display of 3-LCOS (Liquid Crystal On Silicon) laser. The system comprises a red light path, a blue light path and a green light path which are formed by two independent light paths, wherein light generated by a red light source projects needed light spots on an LCOS chip through one independent light path, and light generated by blue and green light sources share the other independent light path to project the needed light spots on the LCOS chip. The lamp optical system disclosed by the invention is different from the conventional projection lighting optical structure, and the area light source module of the lamp optical system has the functions of beam shaping and light spot homogenizing simultaneously, so that under the circumstance of same power output, the optical structure of the optical system is simplified, the system volume is reduced, and the efficiency for solar energy utilization of the system is enhanced.

A liquid crystal on silicon (LCOS) display panel with reducing fringe effect is provided herein. The liquid crystal on silicon display panel includes a common electrode, a semiconductor substrate having a plurality of pixel electrodes and control electrodes, a passivation layer on the pixel electrodes and a part of the semiconductor substrate, an anti-reflection coating (ARC) layers on the control electrodes, a transparent substrate on the semiconductor substrate, and a liquid crystal layer between the transparent substrate and the semiconductor substrate, wherein each of the control electrodes is disposed between and isolated with two adjacent ones of the pixel electrodes.

The invention discloses a real-time vein positioning and displaying device. The real-time vein positioning and displaying device comprises a near-infrared LED light source, a red-light LED light source, a secondary lens, a dichroscope, a uniform illumination system, an image acquisition and processing system, a projection system and a control system. The image acquisition and processing system is composed of an infrared filter, an infrared detection CCD (charge coupled device) and an image processing portion, and the projection system is composed of a polarizer, a PBS (polarized beam splitter), an LCOS (liquid crystal on silicon), a 1 / 4 wave plate and a projection lens. The invention further discloses a real-time vein positioning and displaying method. Near-infrared light is irradiated in a detected skin area via the illumination system and the projection system, infrared light which is reflected via the skin and carries vein distribution information is acquired by the infrared detection CCD via the projection lens, images after being processed and strengthened are modulated via the LCOS, and visible red light is projected to the detected skin area, so that medical staff are helped to quickly position veins of a patient for assisting in venipuncture.

The present invention relates to a LCOS display driving system. The driving sequential control block generates a control code representing a loading sequence of the R, G, and B data for pixels in one of scan lines. The multiplexer multiplexes the R, G, and B data from latches according the control code. The shared level shifter shifts the level of the R, G, and B data from the multiplexer. The digital analog converts converting the R, G, and B data to a corresponding analog R, G, and B data voltage. The shared unity-gain buffer stores the analog R, G, and B data voltage from the shared digital analog converter. The demultiplexer demultiplexes the analog R, G, and B data voltage according the control code.

The invention discloses a wavelength option switch based on LCOS (Liquid Crystal On Silicon) and a method for reducing port crosstalk. The method comprises the following steps of: calculating the deflection angles theta<1> to theta of all channel wavelength light signals after incidence to LCOS according to a sequential degressive mode of light signal power, and respectively calculating the difference values delta theta<21>-delta theta between other deflection angles theta<2> to theta and the minimal deflection angle theta<1>; making the distance d between optical fiber array ports and the focal length f of a second cylindrical lens in the y direction meet the following expression: f*tan(delta theta)=(2m+1)d / 2, wherein m is a positive integer larger than or equal to 0; or in the formula, delta theta is equal to delta theta<21>, and P refers to the number of ports of the wavelength option switches based on LCOS; and adjusting the phases of the LCOS region pixels corresponding to the wavelengths to output the light signal of the minimal deflection angle theta<1> to any appointed port of the optical fiber array. The method disclosed by the invention reduces the light signals of other wavelength reaching the output port as much as possible so as to reduce the port crosstalk.

A display system includes a controller for carrying out a data bit modulation sequence for driving a display pixel. The controller applies a plurality of sets of data bits for representing a data word and temporarily dispersing the sets for sequentially writing to the display pixel whereby the display pixel displaying a temporarily dispersed intensity. The display system may be wide varieties of display systems including but not limited to a liquid crystal on silicon display, a digital micromirror display, a plasma panel display, or a direct view liquid crystal device.

The invention relates to a polarization compensating element (PCE) for a liquid crystal, e.g. liquid crystal on silicon (LCoS), display system manufactured using a linearly photo-polymerizable polymer (LPP) for orienting a photo-polymerizable liquid crystal polymer (LCP) film. To decrease the reflection, polarization conversion, and interference events in an LPP / LCP assembly the ΔN birefringence value of the LCP material is minimized. Dielectric coatings are added at various locations throughout the assembly for minimizing the amount of reflection, polarization conversion, and interference effects and for suppressing spatial retardance ripples.

This invention relates to methods and apparatus for routing light beams in telecommunications devices using holographic techniques, in particular by displaying kinoforms on LCOS (Liquid Crystal on Silicon) devices. Thus we describe optical beam routing apparatus comprising: at least one optical input to receive an input beam; a plurality of optical outputs; a spatial light modulator (SLM) on an optical path between said optical input and said optical outputs; and a driver for said SLM to display a kinoform on said SLM to diffract said input beam into an output beam comprising a plurality of diffraction orders, wherein a routed one of said diffraction orders is directed to at least one selected said optical output; wherein said apparatus is configured to modify a wavefront of said output beam to reduce a coupling of said output beam into said selected optical output; and wherein said kinoform is adapted to compensate for said wavefront modification to compensate for said reduced coupling and thereby to reduce a coupling of other diffracted light from said input beam into others of said optical outputs than said at least one selected optical output.

An embodiment of the present invention discloses a Liquid Crystal on Silicon (LCOS) display unit, in which a Metal-Insulator-Metal (MIM) capacitor consisting of a micromirror layer, a insulation layer and a light shielding layer is formed by grounding the light shielding layer on a pixel switch circuit layer. Therefore the pixel switch circuit and the capacitor are in vertical distribution, that is, the switch circuit and the capacitor both have an allowable design area of the size of one pixel. Another embodiment of the present invention provides a method for forming a Liquid Crystal on Silicon (LCOS) display unit.

A projector panel includes pixel display, a display controller, and a pattern generator. The pattern generator is operative to output pixel data indicative of at least one application specific predetermined pattern. In a particular embodiment, the projector panel is a liquid-crystal-on-silicon panel. In another particular embodiment, the projector panel is adapted for selective use in either structured light projection systems or conventional video projection systems.

This disclosure describes a compact and lightweight rifle scope display adapter configured to be affixed in front of the objective lens of a rifle scope. The display adapter includes a receptacle that enables the adapter to be electrically connected to a ballistic computer, rangefinder or other targeting mechanism. The display adapter is configured to receive aimpoint information and project illuminated symbology that is brought into focus by the rifle scope optics in such a way that the symbology appears to overlay an image of a scene on which the rifle scope is focused. The display adapter includes a casing that houses processing circuitry, a light emitting diode, polarizer, polarized beam splitter, liquid crystal on silicon imaging element and reflective element. The display adapter also includes a light bar, spherical mirror, quarter-wave plate and an additional polarized beam splitter contained within the light bar.

Described herein is a wavelength selective switch (WSS) type optical switching device (1) configured for switching input optical beams from input optical fiber ports (3, 5 and 7) to an output optical fiber port (9). Device (1) includes a wavelength dispersive grism element (13) for spatially dispersing the individual wavelength channels from an input optical beam in the direction of a second axis (y-axis). The optical beams propagate from input ports (3, 5 and 7) in a forward direction and are reflected from a liquid crystal on silicon (LCOS) device (11) in a return direction to output port (9). The input optical beams are transmitted through a port selecting module (21), which provides polarization diversity to device (1) and provides capability to restrict optical beams returning from LCOS device (11) from being coupled back into input ports (3, 5 and 7).

In embodiments of laser illumination scanning, an imaging unit includes a linear array of spatial light modulators that direct light in a direction perpendicular to an imaging scan direction. The lasers each emit the light through a diffractive optic that uniformly illuminates the spatial light modulators, and a scanning mirror then scans the spatial light modulators to generate a two-dimensional image for display. The lasers can include red, green, and blue lasers for RGB illumination of the spatial light modulators, which can be implemented as reflective liquid crystal on silicon (LCOS), transmissive LCOS, or as micro-electro-mechanical systems (MEMS) mirrors.

The present invention relates to a display, in particular Head-Up-Display of a vehicle, comprising an image forming unit for generating an image, an illumination means for illuminating the image forming unit and a deflecting unit for providing a user with a virtual image of the image generated by the image forming unit, wherein the image forming unit comprises a reflective LCoS- (Liquid Crystal on Silicon) display and the deflecting unit comprises a partially transmissive combiner.

The invention relates to an optical engine for laser projection display of a three-piece liquid crystal on silicon (LCOS). The optical engine comprises a red laser, a green laser, a blue laser, three dodging and reshaping systems, an optical core, a three-piece LCOS, a reflecting mirror and a projection objective, wherein the luminescence centers of the three lasers are positioned on the main optical axes of corresponding dodging and reshaping systems; the three optical axes of corresponding dodging and reshaping systems are parallel with one another; three light beams emitted by the three lasers are adjusted into uniform rectangular parallel light beams by the dodging and reshaping systems respectively; two beams of light directly enter corresponding polarization beam splitters, and the other beam of light is reflected by the reflecting mirror and enters a corresponding polarization beam splitter; and polarized light in three colors is finally combined into white light and enters the projection objective by the optical core. The lasers are taken as light sources, generated laser light is small-bandwidth linear polarized light, and a color filter is not used, so that a large number of polaroids are eliminated, cost is lowered, and the utilization ratio of optical energy is increased simultaneously; and the color gamut range, color brightness degree and color fidelity degree of the optical engine are better than those of the optical engine of the conventional optical system.

A two-panel projection display system includes a color wheel having color filter segments that transmit light having a secondary color, namely cyan, magenta, and yellow, made up of two primary colors. A primary color separator, such as a second color wheel, a transflective dichroic beamsplitter, or a color-sensitive polarizing switch separates the secondary color beam into a first polarized primary color beam and a second polarized primary color beam, which are directed to first and second imager panels. A beam combiner combines the first polarized primary color beam from the first imager and the second polarized primary color beam from the second imager to form a projection beam. Accordingly, any two primary colors can be imaged at the same time enabling the system to be white point balanced.

The present invention discloses a pixel display configuration by providing a voltage controller in each pixel control circuit for controlling the voltage inputted to the pixel electrodes. The controller includes a function of multiplexing the voltage input to the pixel electrodes and also a bit buffering and decoupling function to decouple and flexible change the input voltage level to the pixel electrodes. The rate of DC balancing can be increased to one KHz and higher to mitigate the possibility of DC offset effects and the image sticking problems caused by slow DC balancing rates. This invention further discloses an enabling technology for switching from one DC balance state to another without rewriting the data onto the panels. Therefore, it is not required to implement a high voltage CMOS designs and standard CMOS technologies can be applied to manufacture the storage cells and control panel for the LCOS displays with lower production cost and higher yields.