Disclosed is a device including at least one emitting element and a polariser, each emitting element being configured to emit a first radiation having a first range of wavelengths, the polariser being configured to be traversed at least partially by the first radiation, each emitting element including an emitter and a converter the emitter being configured to emit a second radiation having a second range of wavelengths, the second range being distinct from the range, the converter being configured to at least partially absorb the second radiation and to emit the radiation in response, each converter being interposed between the corresponding radiation emitter and the polariser. Each converter is configured so that the first radiation is rectilinearly polarised along a polarisation direction.

A planar multi-layer assembly method fabricates a dual frequency, dual polarization phased-array antenna. A plurality of vias make up an array of double-walled wells which are connected to a ground plane. A shorted annular ring patch antenna (SARPA) is deposited at the top of each double-walled well. Fabricated coaxially and parallel to each SARPA, is an array of circular patch antennas (CPA). The inner wall of each double-walled well improves isolation of the CPA signals from the SARPA signals. Each SARPA of the array is connected to a pair of first frequency band signal vias and the CPA is coupled to a pair of second frequency band signal vias. Within each frequency band, a plurality of signal phases enable steerable polarized antenna beams.

A polarizer, a polarizer array, a polarization-controllable method and apparatus, and an electronic device are disclosed. The polarizer includes multiple types of polarization units, each polarization unit includes a first liquid crystal cell and a second liquid crystal cell that are laminated, each liquid crystal cell includes a liquid crystal layer and an alignment film, and the alignment film is connected to an electrode layer configured to apply an external voltage to the liquid crystal layer. The first liquid crystal cell and the second liquid crystal cell of each polarization unit may be separately controlled as “connected” or “disconnected”, and orientations of alignment films of first liquid crystal cells between all the multiple types of polarization units are different. In a same polarization unit, when one liquid crystal cell is in an on state, emergent light of the polarization unit is polarized light in one polarization direction.

An embodiment of the present invention discloses a reflective type display device, relating to the technical field of display. The liquid crystal display device is relatively thin and light, with low energy consumption. The reflective type display device comprises a polarizer, a transparent first substrate, a liquid crystal molecular layer and a second substrate arranged in sequence; wherein the reflective type display device further comprises: a selective reflecting layer located between the liquid crystal molecular layer and the second substrate; the selective reflecting layer reflects light with wavelength within a specific wavelength range.

An optical film includes a polarization film including a polymer resin and a dichroic dye, and a phase delay layer disposed on the polarization film and including a liquid crystal.

Disclosed is a mixture containing polymerizable compounds having Formulas (III) and (IV) wherein Ar.sup.1 and Ar.sup.2 are divalent aromatic hydrocarbon or heteroaromatic ring group having D1 or D2 as a substituent; D.sup.1 and D.sup.2 are C1-C20 organic group having at least one aromatic ring selected from the group consisting of aromatic hydrocarbon ring and heteroaromatic ring; A.sup.11-A.sup.22 and B.sup.11-B.sup.22 are alicyclic or aromatic group which may have a substituent, Y.sup.11-Y.sup.22 and L.sup.11-L.sup.22 are single bond, —O—, —CO—, —C0—O—, —O—CO—, —NR.sup.21—CO—, —CO—NR.sup.22—, —O—CO—O—, —NR.sup.23—CO—O—, —O—CO—NR.sup.24— or —NR.sup.25—CO—NR.sup.26— where R.sup.21-R.sup.26 are hydrogen or C1-C6 alkyl group; R.sup.4-R.sup.9 are hydrogen, methyl group or chlorine; one of f and k is integer of 1 to 3 with the other being integer of 0 to 3; g, j, m and q are integer of 1 to 20; and h, i, n and p are 0 or 1.

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The present invention provides a laminate and an image display device, in which alignment defects of a liquid crystal layer provided on an optical alignment layer are suppressed. The laminate includes an optical alignment layer and a liquid crystal layer provided on the optical alignment layer. In the laminate, the liquid crystal layer is formed from a liquid crystal composition containing a liquid crystal compound and a surfactant, and the liquid crystal compound is immobilized in a horizontal alignment state, and the surfactant is a copolymer having a repeating unit containing a fluorinated alkyl group and having a repeating unit containing a mesogenic group.

A liquid crystal display device, which comprises: a backlight source (1); a first handedness cholesteric liquid crystal film layer (2), located at an upper side of the backlight source (1) as a light emitting surface; an array substrate (3), located at an upper side of the first handedness cholesteric liquid crystal film layer (2); a color filter substrate (5), located at an upper side of the array substrate (3); and a second handedness cholesteric liquid crystal layer (4), sandwiched between the array substrate (3) and the color filter substrate (5), the first handedness being opposite to the second handedness. The liquid crystal display device greatly improves light efficiency and transmittance of the display and saves the processing steps and manufacturing costs.

Polarization state in retro-reflective arrays may be controlled throughout the optical path of a retro-reflective retro-imaging setup to enhance system efficiency. A polarization beam splitter layer and a retarder layer placed in front of the retro-reflector array may be oriented such that polarized light is used as source, source input light is efficiently reflected at the polarization beam splitter layer toward the retro-reflective layer, and polarization is converted to circular upon first pass through retarder layer. The polarization may also be oriented at or near 45° with respect to input polarization state, light may be retro-reflected and reconverged at the retro-reflective layer, and converted to linear polarization state. The light may then be rotated about 90° with respect to input linear state, and/or passed through the polarization beam splitter layer upon second pass to form the reconvergent image.

Provided is an optical element including: a liquid crystal cell including a first substrate, a liquid crystal layer, and a second substrate; and a quarter-wave film. The liquid crystal layer contains liquid crystal molecules twist-aligned. The liquid crystal cell includes electrodes. The electrodes are disposed to enable switching between a first state and a second state by application of voltage to the liquid crystal layer. The switching between the first state and the second state controls a polarization state of light incident on the liquid crystal cell. Circularly polarized light incident on the liquid crystal cell is converted to first linearly polarized light in the first state while converted to second linearly polarized light in the second state. Linearly polarized light incident on the liquid crystal cell is converted to first circularly polarized light in the first state while converted to second circularly polarized light in the second state.