An ultrasonic dimming system includes: a function processing module including: a first unit for generating a first electrical signal for locating a target object in a first operation state, to enable an ultrasonic transducer structure to generate first ultrasonic waves, and generating a second electrical signal for identifying finger touch position in a second operation state, to enable the ultrasonic transducer structure to generate second ultrasonic waves; a second unit for detecting reflected first ultrasonic waves to obtain target position information of the target object in the first operation state, and detecting reflected second ultrasonic waves to obtain finger touch position information in the second operation state; a third unit for controlling the ultrasonic transducer structure to perform directional sounding for the target object in the first operation state; a fourth unit for sending a control signal to the dimming glass structure to perform dimming in the second operation state.

An apparatus for proving a dimmable reflection and having a layered structure comprises a curved reflective layer, a curved cover glass layer, and at least one liquid crystal film positioned between the curved reflective layer and the curved cover glass layer. Each of the at least one liquid crystal film may comprise a first substrate layer, a first conductive layer, a first alignment layer, a guest host liquid crystal layer, a second alignment layer, a second conductive layer, and a second substrate layer and may be operable in (1) a vertical state, in which liquid crystal molecules are oriented in a direction perpendicular to a plane, associated with a first reflectivity rate and (2) a planar state, in which the liquid crystal molecules are oriented in a direction parallel to the plane, associated with a second overall reflectivity rate lower than the first reflectivity rate.

A variable transmission filter combines in optical series first and second guest-host liquid crystal devices arranged such that one of them is rotated 180° about its normal axis with respect to the other one. The reverse arrangement of the liquid crystal directors of the first and second guest-host liquid crystal devices improves the viewing angle range of the variable transmission filter but, without compensation, introduces a diminution of contrast ratio. A polarization state-changing device positioned between the first and second guest-host liquid crystal devices changes the polarization states of light exiting the first guest-host_liquid crystal device such that transmittance of light in first and second orthogonal polarization states incident on the first guest-host liquid crystal device responds to electric fields applied to the first and second liquid crystal devices and thereby counteracts the diminution of contrast ratio while maintaining the improved viewing angle range.

There are provided a light control apparatus, a method for manufacturing the light control apparatus, and a display apparatus including the light control apparatus. The light control apparatus includes a first substrate and a second substrate facing each other, and a plurality of liquid crystal units between the first substrate and the second substrate, and the plurality of liquid crystal units includes a first liquid crystal unit having a droplet including a liquid crystal and a polymer and configured as a polymer dispersed liquid crystal (PDLC) and a second liquid crystal unit which is disposed on or under the first liquid crystal unit and configured as a guest-host liquid crystal (GHLC) including a liquid crystal and a coloring member.

A reflective display device includes a pixel structure (200) and a liquid crystal (210) containing a dye. The pixel structure (200) provides the liquid crystal (210) with a first tilt state and a second tilt state that are stable absent application of an electric field. In the first tilt state, the liquid crystal (210) is in an untwisted configuration. In the second tilt state, the liquid crystal (210) is in a twisted configuration, and the dye has an effective absorption that is higher than an effective absorption of the dye when the liquid crystal (210) is in the first tilt state.

The present invention proposes an LCD panel and a method for forming the same. The LCD panel includes an isolator disposed between two adjacent liquid crystal units. Liquid crystal molecules of red liquid crystal units and green liquid crystal units are mixed with quantum rods (QRs) of corresponding colors. The red liquid crystal units correspond to a position of the red pixels, the green liquid crystal units correspond to a position of the green pixels. The QRs and liquid crystal molecules have long axes and directions of the long axes of QRs and liquid crystal molecules are the same.

A display comprises a polarised output spatial light modulator, switchable liquid crystal retarder, absorbing polarizer and touch panel electrodes. The switchable liquid crystal layer is stabilised by a cured reactive mesogen material during application of an applied voltage. Light scatter in privacy mode is reduced and visual security level enhanced. Visibility of disclinations during application of applied pressure, for example from a finger on a touch screen is minimised.

Disclosed is an optical assembly having a first variable transmission layer comprising a first electro-optically active material between a first pair of substrates, a second variable transmission layer comprising a second electro-optically active material between a second pair of substrates, and an electronically switchable birefringent layer, that is capable of altering the phase of incident light, situated between the first and second variable transmission layers. The layers are arranged such that light passing through the optical assembly can be altered based on the voltage applied to each layer. The light transmission levels can be altered between maximally transmissive, minimally transmissive, and semi-transparent levels between the maximally and minimally transmissive levels.

A privacy display comprises a spatial light modulator and a compensated switchable guest-host liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.

An optical device is disclosed herein. In some embodiments, an optical device includes an active liquid crystal element, wherein the active liquid crystal element comprises two base layers, an active liquid crystal layer disposed between the two base layers, wherein the active liquid crystal layer includes a liquid crystal compound and is capable of switching between first and second oriented states, and a hard coating layer formed on one of the base layers, wherein the hard coating layer is formed on an active liquid crystal layer-facing surface or an opposite surface of the base layer, and wherein the hard coating layer having a thickness of 2 μm or more. The optical device is capable of varying transmittance, and can be used for various applications such as eyewear, for example, sunglasses or AR (augmented reality) or VR (virtual reality) eyewear, an outer wall of a building or a vehicle sunroof.