Abstract:
A polarizer including a polarization grating comprising a polarization sensitive photo-alignment layer and a liquid crystal composition arranged on said photo-alignment layer. An alignment pattern, corresponding to the polarization pattern of a hologram, is recorded in the photo-alignment layer, and the liquid crystal composition is aligned on the photo-alignment layer.
Abstract:
A wavelength division multiplexing filter according to the present invention is a wavelength division multiplexing filter having a variable filter shape. The wavelength division multiplexing filter has a resolution equal to 2N times (N being an integer, where N≧1) a reference frequency interval and has frequency arrangement of center frequencies of frequency slots corresponding to the 2N-times resolution be offset by half a cycle with respect to the frequency arrangement of standard wavelength grids having a frequency interval equal to ½N of the reference frequency interval.
Abstract:
A liquid crystal display (LCD) comprises a light source; a light diffractor over the light source configured to diffract light received from the light source; a liquid crystal diffraction grating over the light diffractor and between liquid crystal pixel structures comprising a plurality of liquid crystal pixels; the liquid crystal diffraction grating has a changed diffraction index in response to application of a voltage differential across the diffraction grating, and when having the changed diffraction index aligns diffracted light received from the light diffractor into aligned light directed toward the liquid crystal pixel structure. An LCD may comprise a plurality of liquid crystal pixels each comprising a reflective part and a transmissive part, the reflective part of at least some of the plurality of liquid crystal pixels comprising a retroreflector configured to reflect at least some light rays, received from an external light source, toward the external light source.
Abstract:
A high density data communications system and associated method comprises a multi-wavelength light source that provides a combined plurality of constituent lights having different wavelengths to a diffraction device that spatially separates the constituent lights to form a predetermined pattern of lights in order by their wavelengths, a light modulating processing array that individually modulates the separated lights in parallel according to data to form constituent light channels, a combiner that recombines the modulated separated light channels in parallel into a composite data communication light, a second diffraction device that spatially separates the modulated light channels into the predetermined pattern of wavelengths, and a demodulating processing array that extracts the data from the constituent modulated light channels.
Abstract:
The present invention relates to methods for increasing the surface conductivity of a polymer used in tuneable diffraction grating (TDG) modulators while at the same time maintaining the total internal reflection (TIR) and transparency.
Abstract:
Optical gratings that perform a number of functions at various wavelengths are formed by various methods that preserve spectral information within a wavelength band, the functions including: coupling radiation from one wavelength to another, controllable gratings that operate on different wavelengths in response to external control signals.
Abstract:
The invention provides an optical device, including a light-transmissive substrate, and a pair of different, parallel gratings including a first grating and a second grating, located on the substrate at a constant distance from each other, each of the pair of parallel gratings including at least one sequence of a plurality of parallel lines, wherein the spacings between the lines gradually increase from one edge of the grating up to a maximum distance between the lines, and wherein the arrangement of lines in the second grating is in the same direction as that of the first grating. A system utilizing a plurality of such optical devices is also disclosed.
Abstract:
A polarization grating comprising a polarization sensitive photo-alignment layer (2) and a liquid crystal composition (3) arranged on said photo-alignment layer is provided. An alignment pattern, corresponding to the polarization pattern of a hologram, is recorded in the photo-alignment layer, and the liquid crystal composition is aligned on the photo-alignment layer. As the origin for the alignment of the liquid crystal composition is a polarization hologram recorded in a photo-alignment layer, an essentially defect-free pattern can be obtained with this approach.
Abstract:
A beam steering system having first diffraction gratings, each one being associated with a corresponding one of a first plurality of grating vectors disposed substantially in a first plane. The gratings diffract optical energy from any one of a plurality of input directions of resonance to a corresponding one of a plurality of output directions. Second diffraction gratings are associated with a second plurality of grating vectors disposed substantially in a second plane. Each one of the second gratings diffracts optical energy from any one of a plurality of input directions of resonance to a corresponding one of a plurality of output directions. An arrangement directs a beam of optical energy to a selected one of the first gratings along a selected one of the plurality of input directions for the selected one of the first gratings, selected to provide the corresponding one of the output directions from the first gratings to be substantially equal to a selected one of the plurality of input directions for the selected one of the second gratings, thereby providing a selectable set of beam output directions.
Abstract:
A transflective display panel and a display apparatus using the same are provided. The display panel includes a plurality of pixels arranged in a matrix. Each of the pixels includes a plurality of subpixels, and each subpixel within a pixel outputs a different color of light. In addition, each of the subpixels includes a transflective mode region which has a reflection mode region with a diffraction grating and a transmission mode region; a liquid crystal layer which adjusts a transmittance of incident light through electric control; and a sub color filter which transmits light within a wavelength band of the incident light. Because the display panel includes the reflection mode region where the diffraction grating is formed, it can display a high-quality image with good white balance, even while outdoors or under bright illumination.