Alphamicron Incorporated | Date: 2016-08-08
An electronically controllable eyewear device having a cell filled with a liquid crystal material that can be electronically operated in an auto or a manual mode. The device contains a photosensor for generating a light input signal to trigger an automatic application of voltage to the cell when the device is in an auto mode, one or more switches capable of being actuated in a series of actuation sequences each to select a distinct function, and a control circuit responsive to each actuation sequence and light input signal to operate the cell in a corresponding one of a plurality of functions, including: (i) a first sequence for affecting an ON/OFF function, (ii) a second sequence for affecting a system change from the manual mode to the auto mode, and (iii) a third sequence for changing the threshold value for triggering the automatic application of voltage.
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase II | Award Amount: 999.95K | Year: 2016
ABSTRACT:There is interest in developing an electronically controllable variable transmittance for fixed wing visor applications. Guest-host liquid crystal technology developed by AlphaMicron, namely e-Tint, has demonstrated the ability to meet the optical requirements for this application. However, implementation on large area, complex curve visors has not been attempted. AlphaMicron proposes to investigate the use of its e-Tint technology for variable transmittance visor application. The program will study the relevant parameters associated with fabrication of a doubly curved liquid crystal device using plastic substrates.BENEFIT:The program will identify the relevant parameters and potential limitations associated with implementation of guest-host liquid crystal systems for large area, complex curve eyewear including visors. Successful program will overcome issues associated with visibility of image in bright lighting conditions and will serve to enhance the performance of a pilot. Commercial applications for this development include fixed and rotary wing pilots as well as consumer motorcycle riders.
Alphamicron Incorporated | Date: 2012-11-30
A structural interface having an adaptive liquid crystal material that is positioned to receive electromagnetic radiation and adapted to reflect a selective band of the received electromagnetic radiation so as to help with cooling of a structure in the summer and/or heating of the structure in the winter. The adaptive liquid crystal material is designed to change its selective reflection band when exposed to an activating temperature or an activating light or both. Depending on the interior and/or exterior conditions, the adaptive liquid crystal material has one or more selective reflection bands with a peak wavelength selected from the following: within a sunlight wavelength span, outside a thermal infrared wavelength span, outside the sunlight wavelength span, or within the thermal infrared wavelength span. The structural interface may be applied to an exterior or interior surface of a structural envelop or be integrated into a structural envelope material.
Alphamicron Incorporated | Date: 2015-07-21
A non-polarizer based variable light attenuating device includes a guest-host solution having a liquid crystal host and a guest dichroic dye disposed between first and second conducting layers provided on first and second transparent substrates. The guest-host solution has a low-haze while the guest dye orientation alters between a low light transmitting orientation and a high light transmitting orientation in response to a first voltage supplied to the first and second conducting layers. In response to a second voltage supplied to the first and second conducting layers, the guest-host solution changes to a focal conic light scattering orientation to achieve a high-haze translucent state.
Alphamicron Incorporated | Date: 2013-11-13
Described is a kit, an optical insert assembly and a method for attaching an optical insert to a viewing lens of an eye-shielding device. The kit includes an optical insert with an outer perimeter, and a flexible border attachment element with an inner periphery area extending inward of the outer perimeter of the optical insert, and an outer periphery area extending outward of the outer perimeter of the optical insert, and having a first adhesive area for attachment to the optical insert and a second adhesive area for attachment to the viewing lens. When attached, the border attachment element defines a buffer zone spanning the inner periphery and outer periphery areas. The optical insert assembly includes the elements of the kits described herein, attached to a viewing lens of an eye-shielding device.
AlphaMicron Inc. | Date: 2013-05-07
Provided is a liquid crystal light variable device having a liquid crystal cell, comprising a mixture of a liquid crystal material and one or more dichroic dyes interposed between a first and a second substrate, each substrate having a conductive layer disposed thereon. The device further includes a voltage supply or controller coupled with the conductive layers for application of a voltage waveform across the liquid crystal cell. The liquid crystal cell is configured so that based on the voltage waveform applied, the device transitions between a low-haze low-tint state (clear state), a low-haze high-tint state (tinted state), and a high-haze high-tint state (opaque state). The high-haze state is caused by dynamic scattering in the liquid crystal-dye mixture.
Alphamicron Incorporated | Date: 2013-07-11
A light emitting photonic bandgap (PBG) material, and devices uses the same, having (a) a polymer network exhibiting a non-uniform pitch; (b) a small molecule liquid crystal material with a birefringence >0.04; and (c) one or more light emitting dyes having a low triplet state absorption. The light emitting PBG material has a defect-induced density of states enhancing feature at a wavelength that overlaps the emission spectrum of the light emitting dye. Excitation of the light emitting PBG material by a light source causes a directional electromagnetic emission from the light emitting material. The PBG material, and device, are capable of emitting continuous wave laser light as a result of excitation by a low-power incoherent light source.
Alphamicron Incorporated | Date: 2014-07-29
An electronically dimmable optical device, including, in sequence, an active absorbing polarizer; a first static reflective polarizer; an active polarization rotator; and a second static reflective polarizer; configured so that the reflectivity and/or transmissivity of the device can be controlled (increased or decreased) by application of a voltage across the active absorbing polarizer and/or the active polarization rotator. One or more polarization levels can be selected by controlling the voltage at the active absorptive polarizer such that setting the active absorptive polarizer to a selected polarization level determines the brightness of an image produced by the device.
Alphamicron Incorporated | Date: 2015-09-14
We describe a wide band variable transmission optical device having an electronically active cell comprising a guest-host mixture of a liquid crystal host and a dichroic guest dye material contained between a pair of plastic substrates. The liquid crystal host has an axis orientation that is alterable between a clear state orientation and a dark state orientation and the dichroic guest dye material includes one or more dichroic dyes. The optical device is characterized in that it exhibits a wide absorption band that is greater than 175 nm within a visible wavelength range of 400-700 nm, has a clear state transmission equal to or above 30% and a dark state transmission equal to or below 40%.
AlphaMicron Incorporated | Date: 2014-03-17
A naphthopyran compound represented by the formula B^(1 )and B^(2 )are selected independently from the group consisting of a phenyl, naphthyl, or heterocyclic aromatic group, or may combine to form one or more aromatic rings. B^(1 )and B^(2 )may further include one or more substituents. R^(3), R^(4), R^(5), R^(6), and R^(16 )are selected independently from the group consisting of hydrogen, halogen, R^(a), OH, OR^(a), OCOR^(a), CN, NO_(2), SO_(2)R^(a), SOR^(a), SH, SR^(a), NH_(2), NHR^(a), NR^(a)R^(a), or NR^(b)R^(c); or wherein R^(5 )and R^(6 )combine to form a cyclic group. R^(a )may include an alkyl, polycycloalkyl, alkenyl, polyalkenyl, haloalkyl, perhaloalkyl, alkynyl, polyalkynyl, hydroxyalkynyl, polyhydroxyalkynyl; or (C_(3-20))cycloalkyl group. R^(b )and R^(c )may include hydrogen or alkyl groups, or may combine to form a saturated heterocyclic group, or together with an adjacent phenyl group may form a julolidinyl group. R^(7 )is a mesogenic group. And the naphthopyran, which may be referred to as a dichroic-photochromic compound, may be incorporated into an optical article.