665 results about "Phase retardation" patented technology

The invention discloses a microwave antenna and an outer cover thereof. The outer cover is a rotational symmetric element which comprises a plurality of homocentrically arranged parts as below: a compensation part arranged at the middle of the outer cover and used for compensating the phase delay of the electric field distribution at the middle of an antenna aperture surface caused by the shielding of a feed source, a main reflection part arranged at the periphery of the compensation part and used for reflecting the electromagnetic wave emitted from the microwave antenna feed source to a specific direction deviating from the feed source, and an assistant reflection part arranged at the periphery of the main reflection part and used for carrying out reflex bunching on the edge diffraction electromagnetic wave of the microwave antenna. All the parts of the outer cover are especially designed and shaped, therefore the microwave antenna has the characteristics of excellent electrical properties, stable structure, low cost and the like.

A device structure for single cell gap reflective and transflective liquid crystal displays (TF-LCDs). For an entirely reflective LCD, the imbedded wire-grid polarizer (WGP) serves as a polarization-dependent for the ambient light. For a transflective TF-LCD, the WGP only covers the reflective pixels. The disclosure also includes a method of using single cell gap liquid crystal displays (LCDs) without phase retardation films by providing a single cell gap LCD having reflective pixels and transmissive pixels, covering solely the reflective pixels, with at least one of: a wire grid polarizer and a broadband cholesteric reflector (BCR), reflecting ambient light off the reflective pixels; and passing back light through the transmissive pixels whereby the cell gap LCD obtains high contrast ratios without using phase retardation films.

A liquid crystal display includes a liquid crystal display panel having a first substrate and a second substrate. An upper polarizer is disposed on an outer surface of the first substrate. A viewing angle control film is disposed on the upper polarizer. The viewing angle control film includes a polarizing layer having a transmission axis substantially parallel to a transmission axis of the upper polarizer and a phase retardation layer including a birefringence material having an optical axis with a poloidal angle of about 40 degrees to about 75 degrees.

Provided is an electro-optic device comprising: a liquid crystal layer between a pair of opposing transparent substrates; a resistive patterned electrode set positioned between the liquid crystal layer and the inward-facing surface of the first transparent substrate; and a conductive layer between the liquid crystal layer and the inward-facing surface of the second transparent substrate, wherein the conductive layer and resistive patterned electrode set are electrically connected, and wherein said resistive patterned electrode set comprises one or more electrically-separated electrodes, wherein the desired voltage drop is applied across each electrode to provide the desired phase retardation profile.

The invention provides a three-dimensional display, a production method and a control method thereof; the three-dimensional display is suitable for an observer to watch when wearing glasses which are provided with two lenses orthogonalized in the polarization direction; and the three-dimensional display comprises a display panel and a liquid crystal phase modulation panel. The display panel is provided with pixels and a polarizing plate between the pixels and the glasses; the polarizing plate is provided with a penetration shaft; and the display panel is suitable for displaying images. The liquid crystal phase modulation panel is located between the polarizing plate and glasses and provided with a liquid crystal layer and an alignment layer adjacent to the display panel; wherein, the angle formed between the alignment direction of the alignment layer and the penetration shaft is actually n multiplying 45 degrees; the absolute value of n is an integer; the liquid crystal phase modulation panel is suitable for providing the phase retardation; by adjusting the phases of images, the liquid crystal phase modulation panel outputs the images with three-dimensional information; and the liquid crystal phase modulation panel does not have any polarizing plate.

Disclosed is a fringe field switching mode transflective liquid crystal display capable of displaying high quality images. The transflective liquid crystal display includes a lower substrate having a counter electrode and a pixel electrode, an upper substrate aligned in opposition to the lower substrate by interposing a liquid crystal layer therebetween, an upper polarizing plate, a lower polarizing plate, a reflective plate provided at an inner portion of the lower substrate, a lower λ/2 plate, and an upper λ/2 plate. An inclination angle, a slit width and a slit interval of the pixel electrode of the reflective area are different from those of the pixel electrode of the transmissive area. The liquid crystal layer presents a phase delay of about 0 to λ/4 in the reflective area and presents a phase delay of about 0 to λ/2 in the transmissive area.

A form birefringence to compensate the phase retardation caused by a liquid crystal device has a retardation compensation film that is composed of alternately deposited high and low refractive index layers. The retardation compensation film is provided in at least one of the incident side and the emanation side of the liquid crystal device. The birefringence value Deltan and the total thickness d of the retardation compensation film are adjusted such that the retardation of the retardation compensation film agrees with the retardation of the liquid crystal device at least at one wavelength in the visible band.

Disclosed are liquid crystal (LC) phase-retarders and linear polarizers and methods and apparatus for making the same. The liquid crystal phase-retarder is realized by a liquid crystal film structure having one or more phase retardation regions formed therein. Each phase retardation region has an optical axis specified by the direction and depth of orientation of liquid crystal molecules along the surface of the liquid crystal film structure. The liquid crystal linear polarizer is realized by a liquid crystal film structure having a chiral phase region within which liquid crystal molecules are cholesterically ordered. One or more nematic phase regions are formed along the surface of the liquid crystal film structure within which liquid crystal molecules are oriented along a direction and to a surface depth sufficient to realize one or more phase retardation regions therein having optical axes along the direction of liquid crystal molecule orientation.

A LCD device having a thin phase retardation film is disclosed, which is achieved using a thin film polarizing film formed by accurately processing a thin aluminum film, a polarizing film of a nano imprint lithography method that uses polymer, and a polarizing film and a liquid crystal material that form a polarizing nano material thin film by uniformly coating a polarizing nano material (TCF).

An optical film, a circular polarizing plate, and a display device are provided. The optical film may exhibit a desired phase retardation property in a wide wavelength range even when it is relatively thin. The optical film may exhibit the 1/4 wavelength phase retardation property. The optical film may be manufactured by a simple process. The optical film may be used in LCDs such as a reflective LCD, or OLEDs.

The invention discloses a display panel and a display device. The display panel comprises a first substrate, a liquid crystal layer, a waveguide layer, a grating layer, a first electrode and a second electrode, the liquid crystal layer, the first electrode and the second electrode are positioned between the waveguide layer and the first substrate, the first electrode and the second electrode are used for adjusting the refractive index of the liquid crystal layer, the liquid crystal layer is used for controlling light emission from the waveguide layer in a coupling manner, the coupling light emission quantity of the waveguide layer is determined according to the difference between the refractive index of the waveguide layer and the refractive index of the liquid crystal layer, and the grating layer is used for controlling light with a special wavelength among the light coupled from the waveguide layer to be emitted in a special direction. A polarizing film and a color resistor set in the display panel are omitted, so that transmittance of the display panel is improved. As the polarizing film set in the display panel is omitted, the overall phase retardation quantity of the liquid crystal layer is not required, a liquid crystal box can be thin, and the response time of liquid crystals is prolonged.

Disclosed is a phase shifter having a power dividing function. The phase shifter includes: an input port for receiving a radio frequency (RF) signal; a power dividing unit for dividing the RF signal into a first divided signal of which phase is to be varied and a second divided signal having a fixed phase value; a first output port for outputting the second divided signal having the fixed phase value; a phase shift unit for dividing the first divided signal into a third divided signal and a fourth divided signal wherein the third divided signal and the fourth divided signal move in opposite directions; a phase delay unit for shifting phase of the third divided signal and the fourth divided signal based on a difference in a path length of the third divided signal and the fourth divided signal, to thereby generate phase-shifted signals; and at least two second output ports connected to the phase delay unit, for outputting the phase-shifted signals.

A waveguide and method for controllably altering an optical phase delay (OPD) of light traveling along a propagation direction through the waveguide. Many embodiments are disclosed, and in one example, a waveguide may include a core for guiding the light through the waveguide; at least one cladding adjacent the core, wherein the at least one cladding has liquid crystal molecules disposed therein; at least one electrode for receiving a first voltage for controllably altering the optical phase delay of the TE polarized light traveling through the waveguide; and at least one electrode for receiving a second voltage for controllably altering the optical phase delay of the TM polarized light traveling through the waveguide.

A crystallization apparatus includes an illumination system which applies illumination light for crystallization to a non-single-crystal semiconductor film, and a phase shifter which includes first and second regions disposed to form a straight boundary and transmitting the illumination light from the illumination system by a first phase retardation therebetween, and phase-modulates the illumination light to provide a light intensity distribution having an inverse peak pattern that light intensity falls in a zone of the non-single-crystal semiconductor film containing an axis corresponding to the boundary. The phase shifter further includes a small region which extends into at least one of the first and second regions from the boundary and transmits the illumination light by a second phase retardation with respect to the at least one of the first and second regions.

A display device including a touch panel arranged on a display panel, the touch panel including at least one phase retardation layer, a polarization plate arranged on the at least one phase retardation layer, a touch sensing structure including at least one sensing pattern arranged directly on at least one of at least one face of the phase retardation layer and at least one face of the polarization plate, an adhesion layer arranged on the polarization plate and a window arranged on the adhesion layer.

The present invention provides uniaxially stretched polymer films that have a refractive index profile suitable for use as negative A-plates or biaxial birefringent plates in a liquid crystal display (LCD) device. These wave plates can be used to compensate for the phase retardations existing in various modes of LCDs including TN (twisted nematic), VA (vertically aligned), IPS (in-plane switching), and OCB (optically compensated bend), and therefore improving the viewing quality of the displays.

The invention discloses a zero-crossing-point accurate detection method for AC voltage signals. The method includes the following steps: firstly selecting a comparatively large hardware filtering time constant to ensure that harmonic waves and random noises which may be included in the AC voltage signals can be filtered comparatively well; using large-time-constant software PQ filtering to extract and eliminate DC drift generated by software and hardware; setting a software judgment advancing quantity so as to offset zero-crossing-point delay caused by hardware filtering; accurately calculating random errors t caused by sampling intervals; and at last, using capture and comparison functions of an embedded microcontroller to realize accurate information of an AC voltage frequency and phase so that accurate phase locking of the AC signals can be realized. The detection method solves a problem of zero drift and phase delay caused by a hardware detection circuit and a software algorithm when zero-crossing-point detection is carried out on the AC voltage signals.