Abstract:
A lighting device using a liquid crystal beam modulator produces good broadening of a light beam. The liquid crystal cell has a patterned electrode structure having a pattern of paired electrodes on a first one of a pair of cell substrates for providing a spatially modulated electric field extending into a liquid crystal material, and the cell is arranged with respect to a light source so that an incident beam will arrive through another of the pair of substrates and exit from the first one of the pair of substrates.
Abstract:
A liquid crystal optical device is described configured to provide variable beam steering or refractive Fresnel lens control over light passing through an aperture of the device. The device includes at least one layer of liquid crystal material contained by substrates having alignment layers. An arrangement of electrodes is configured to provide a spatially varying electric field distribution within a number of zones within the liquid crystal layer. The liquid crystal optical device is structured to provide a spatial variation in optical phase delay with a transition at a boundary between zones which is an approximation of a sawtooth waveform across the boundaries of multiple zones. The arrangement of electrodes, device layered geometry and methods of driving the electrodes increase the effective aperture of the overall optical device.
Abstract:
A reprogrammable intraocular adaptive lens prosthesis apparatus is provided. The apparatus includes a tunable liquid crystal lens (TLCL) encapsulated in the intraocular prosthesis with control electronics and a power source or in the intraocular prosthesis with a control signal receiver while an external control electronics package transmits the control signal. The TLCL is driven in response to a stimulus signal to provide accommodation. The TLCL corrects other visual shortcomings of the natural eye. The intraocular prosthesis has a remote programmable TLCL controller configured to recalibrate the TLCL to compensate for dynamic adaptation of the eye over time.
Abstract:
A spatially non-uniform electrode structure is proposed for controlling a spatially non- uniform electric field driving a tunable liquid crystal lens. The spatially non-uniform electrode structure enables the generation of a predetermined spatially non-uniform electric field profile where complex capacitive coupling between multiple different electrically floating neighboring electrode segments is employed for the generation of the electrical field of desired form by supplying an initial electric potential to a limited number of electrodes.
Abstract:
An auto-focus system employing a tunable liquid crystal lens is provided that collects images at different optical power values as the liquid crystal molecules are excited between a ground state and a maximum optical power state tracking image focus scores. An image is acquired at a desired optical power value less than maximum optical power established with the liquid crystal molecules closer a fully excited state than the maximum optical power state having the same image focus score. This drive signal employed during image acquisition uses more power than was used to achieve the same optical power value during the auto-focus scan, while actively driving the liquid crystal molecules is fast. A pause due to image transfer/processing delays after acquisition is employed to allow slow relaxation of the liquid crystal molecules back to the ground state in preparation for a subsequent focus search.
Abstract:
Variable liquid crystal devices for controlling the propagation of light through a liquid crystal layer use a frequency dependent material to dynamically reconfigure effective electrode structures in the device. The frequency of a drive signal that generates an electric field in the device may be varied, and the frequency dependent material has different charge mobilities for the different frequencies. At a low charge mobility, the frequency dependent material has little effect on the existing electrode structures. However, at a high charge mobility, the frequency dependent material appears as an extension of the fixed electrodes, and may be used to change the effective electrode structure and, thereby, the spatial profile of the electric field. This, in turn, changes the optical properties of the liquid crystal, thus allowing the optical device to be frequency controllable.
Abstract:
A variable angle beam control device is capable of maintaining the same color temperature of the light source regardless of the changes in the angle of the beam. The controllable light beam device has a light source with primary optics producing a low divergence light beam having an inverted angular distribution of the correlated color temperature (CCT), and a liquid crystal device with an electrically variable refractive index distribution arranged to receive said light beam and to provide a variable angle beam.
Abstract:
An architectural lighting device for wall washing providing suitable beam modulation is described herein. The device combines a variable divergence beam source (a light source along with a beam stretching element) in combination with a specially designed side reflector that redirects a portion of a broadened beam back onto the wall so as to have wall illumination increase with beam divergence.
Abstract:
A method of wafer level manufacturing, separating and electrical connection of liquid crystal optical devices is disclosed. An electro-optic device having at least one liquid crystal cell for providing spatially variable control of light is also described. The electro-optic device includes: a pair of opposed substrates, each substrate having a lateral extent; a pair of electrodes for applying an electric field therebetween, each electrode having a pattern and being deposited on a corresponding substrate, each electrode having an electrical contact area extending to at least one side of the corresponding substrate; a pair of alignment layers sandwiching a liquid crystal layer therebetween, the alignment layers defining a predominant orientation direction for liquid crystal molecules of the liquid crystal layer; and a liquid crystal reservoir wall defining a lateral extent of the liquid crystal layer, the liquid crystal reservoir wall being spaced from at least one side of each substrate such that each electrode electrical contact area is exposed to air in an air gap between the substrates.
Abstract:
A liquid crystal optical device is described configured to provide variable beam steering or refractive Fresnel lens control over light passing through an aperture of the device. The device includes at least one layer of liquid crystal material contained by substrates having alignment layers. An arrangement of electrodes is configured to provide a spatially varying electric field distribution within a number of zones within the liquid crystal layer. The liquid crystal optical device is structured to provide a spatial variation in optical phase delay with a transition at a boundary between zones which is an approximation of a sawtooth waveform across the boundaries of multiple zones. The arrangement of electrodes, device layered geometry and methods of driving the electrodes increase the effective aperture of the overall optical device.