141 results about "Liquid crystal devices" patented technology

The invention relates to the technical field of liquid crystal devices, and particularly discloses a normally-on flexible liquid crystal dimming film and a preparation method thereof. The structure of the normally-on flexible liquid crystal dimming film sequentially comprises a first flexible transparent substrate, a first vertical alignment layer, a dye liquid crystal layer, a second vertical alignment layer and a second flexible transparent substrate from top to bottom, wherein the materials of the first vertical alignment layer and the second vertical alignment layer are selected from side chain type transparent polyimide materials; the dye liquid crystal layer comprises black dichroic dye and negative phase liquid crystal. By accurately controlling the orientation arrangement of liquid crystal molecules, a high-precision pretilt angle is realized, the light modulation amplitude in a visible light broadband range reaches 45% or above, and the photoelectric property is equivalent to that of a normally dark (forward) mode liquid crystal dimming film.

The embodiment of the invention provides a liquid crystal composition and application thereof. The liquid crystal composition comprises an additive and three compounds with specific structures, and the liquid crystal composition is high in birefringence, appropriate in clearing point, not prone to crystallization at low temperature, good in high-temperature-resistant stability and anti-ultraviolet stability and beneficial to application in liquid crystal devices.

This invention provides a liquid crystal device. The liquid crystal device includes one or more pixel elements, each pixel element including a first substrate, a second substrate, a liquid crystal layer between the first and second substrates, a first plurality of electrodes and a second plurality of electrodes formed between the first substrate and the liquid crystal layer, and a third plurality of electrodes and a fourth plurality of electrodes formed between the second substrate and the liquid crystal layer; wherein the electrodes of the first plurality of electrodes and the second plurality of electrodes are respectively electrically driven, the electrodes of the third plurality of electrodes and the fourth plurality of electrodes are respectively electrically driven, an in-plane electric field is formed between the first and second plurality of electrodes, and between the third and fourth plurality of electrodes, and an out-of-plane electric field is generated between the first electrode and the third or fourth electrode, and between the second electrode and the third or fourth electrode, and the in-plane electric field and the out-of-plane electric field form an electric field in an orthogonal direction.

This liquid crystal panel comprises a first substrate, a second substrate, a liquid crystal layer, and an electrode layer. An insulating layer is formed on the electrode layer of at least one substrate, from among the first substrate and the second substrate, provided with the electrode layer. The direction of the transmission axis of a first polarizing plate provided on the first substrate side and the direction of the transmission axis of a second polarizing plate provided on the second substrate side are perpendicular or parallel to each other. Light emitted from the light source passes through the second polarizing plate, the second substrate, the liquid crystal layer, and the first substrate, in this order, provided on the second substrate side. While the electrode layer is applying an electric field to the liquid crystal layer, the transmittance of the light emitted from the first polarizing plate is modulated to an impulse type between a low transmittance and a high transmittance.

To provide a sealing agent for a liquid crystal device which is excellent in storage stability, low temperature curability, insertion prevention, and low liquid crystal contamination.SOLUTION: A sealing agent for a liquid crystal device contains a curable resin, an acid anhydride, and a base generator, wherein the base generator generates a tertiary amine compound by heating or irradiation with active energy rays.SELECTED DRAWING: None

A liquid crystal device and an electronic apparatus. An impurity generated in a display area of the liquid crystal device is removed from the display area based on a polarity of the impurity. A liquid crystal device according to an embodiment includes: a common electrode to which a common potential is applied; a pixel electrode to which a signal potential is applied and which is disposed in the display region; a first electrode to which a first potential having positive polarity with respect to the common potential is applied, the first electrode being disposed outside the display region in plan view; a second electrode to which a second potential having a negative polarity with respect to the common potential is applied, the second electrode being disposed outside the display region in plan view; and a liquid crystal layer disposed between the pixel electrode and the common electrode, between the first electrode and the common electrode, and between the second electrode and the common electrode. In plan view, the first electrode has a first portion and a second portion having a longer distance from the display region than the first portion. The second electrode is disposed between the display region and the second portion in plan view.

The application relates to an exposure device based on a spatial phase modulator and a liquid crystal device, which comprises a light source control module, a light intensity and polarization control module, a focusing servo module, a sample setting module, a voltage control module and a monitoring module, the light source control module comprises a first switchable mirror and a light source switching assembly, the light intensity and polarization control module comprises a light intensity modulation assembly for receiving a light beam output by the light source control module and modulating the light intensity of each pixel point in the light beam, and a polarization modulation assembly for modulating the polarization state of each pixel point in the light beam emitted by the light intensity modulation assembly; the first switchable mirror is used for switching the light path between the light intensity modulation assembly and the polarization modulation assembly; the focusing servo module and the sample setting module are both switched to face the polarization modulation assembly or the first switchable mirror. Compared with the prior art, the exposure device has more degrees of freedom, the exposure process is simple and efficient, and the needs of experimental teaching and scientific research engineering can be met.

A liquid crystal device according to the present disclosure comprises: a shift register unit that, in synchronization with a clock signal, sequentially captures video signals the number of which corresponds to the number of columns of a plurality of pixels; a latch unit that, in synchronization with a trigger signal, simultaneously outputs the plurality of video signals captured by the shift register unit; a plurality of comparators that, when each of the plurality of video signals outputted from the latch unit and a gradation signal are compared and match each other, activate respective match signals; an analog switch unit that supplies a plurality of analog voltages corresponding to timings at which the respective match signals of the plurality of comparators are activated to a plurality of data lines; and a failure detection circuit that captures the respective match signals of the plurality of comparators in synchronization with the trigger signal and outputs a failure detection result in synchronization with the clock signal.

To provide a liquid crystal alignment film capable of forming a liquid crystal display element having favorable afterimage characteristics and excellent display quality, and liquid crystal alignment agent for alignment.SOLUTION: There are provided a liquid crystal alignment agent and liquid crystal alignment film, and a liquid crystal element using the same. The liquid crystal alignment agent contains a polymer (K) which is at least one polymer selected from a group consisting of a polyamic acid, a polyamic acid ester and a polyimide, where a raw material composition of the polymer (K) contains at least one tetracarboxylic acid derivative represented by formula (I) and at least one diamine having a specific structure.SELECTED DRAWING: None

The invention provides a liquid crystal cell thickness detection method, device, equipment and medium based on coherence tomography, and the method comprises the following steps: generating an incident light beam by using a wide-spectrum low-coherence light source, and dividing the incident light beam into reference light and sample light of which the propagation directions are perpendicular to each other by using a beam splitter; the reference light is reflected back to the beam splitter after being vertically incident to the reflective mirror, and is propagated to an acquisition end along an original propagation direction; enabling the sample light to vertically enter the to-be-detected silicon-based liquid crystal device, then reflecting the sample light back to the beam splitter, changing the direction through the beam splitter, and propagating the sample light to an acquisition end; the interference signals of the reference light and the sample light are collected at the collection end, and the depth information of the to-be-measured silicon-based liquid crystal device is obtained after FFT processing is carried out on the interference signals, so that the problem that the thickness of a small-size liquid crystal box is difficult to accurately measure is solved.

A liquid crystal device (400) is provided comprising: a liquid crystal layer having a thickness and comprising: a liquid crystal material; and a plurality of polymer structures (414a, 414b) comprising polymerised liquid crystal material. Each polymer structure (414a, 414b) is located at a different depth in the thickness of the liquid crystal layer. Electrodes are provided configured to apply an electric field to the liquid crystal layer. Each polymer structure (414a, 414b) has a different selected locked-in liquid crystal state.

To visually distinguish switchable information or decoration and to perform this without increasing the thickness of an LCD cell, with less complexity and without taking up space.SOLUTION: The display device comprises a liquid crystal cell (2) formed from two transparent plates (4, 6), defines a useful zone (12) so as to define a visible zone of the liquid crystal cell, and incorporates electrodes forming a switchable display of an item of information and / or of a decoration. The liquid crystal cell comprises, in the useful zone, a plurality of polarisers 16, 18 arranged in a plurality of distinct zones 17, 19, respectively, on the external face 5 of one of the two transparent plates, each partially forming a switchable display. The two polarizers have different optical properties or different polarization directions between them and are configured to visually create a difference between the respective portions of the two polarizers and / or the respective portions of the switchable display in the respective discrete zones.SELECTED DRAWING: Figure 1

The invention provides an optical display module and a head-mounted display device, the optical display module comprises a display assembly, and the display assembly is used for displaying an image; the refraction assembly is arranged on the surface of the light-emitting side of the display assembly, and the refraction assembly comprises a substrate and a refraction element arranged on the surface of the substrate; the reflection assembly is used for reflecting part of light rays emitted by the display assembly into human eyes; the adjusting assembly is used for adjusting the focal power of the optical display module, the refractive index of the refraction assembly is adjusted in an electric control mode by using the holographic lens with the light weight as the reflection assembly or using the liquid crystal device or the metasurface device, and therefore under the condition that the focal power of the optical display module can be adjusted, the focal power of the optical display module can be adjusted. And the weight and the size of the optical display module are reduced.

The invention provides a method for manufacturing a liquid crystal alignment film, a method for repairing defects of the liquid crystal alignment film, a method for manufacturing a liquid crystal device, and a photo-alignment agent for repairing, which can simply and accurately repair defects in the liquid crystal alignment film and can obtain a liquid crystal device with fully suppressed display defects. A liquid crystal alignment film is manufactured by a method including: a film forming step of forming a liquid crystal alignment film by applying a liquid crystal alignment agent on a substrate; a detection step for detecting defects existing in the liquid crystal alignment film; a coating step in which, when the defect is detected in the detection step, a region including the defect in the liquid crystal alignment film is partially coated with a light alignment agent for repair; and an irradiation step for irradiating a region including the application site of the repair photo-alignment agent with radiation.

According to one embodiment, each of a first liquid crystal to a fourth liquid crystal cell includes a first strip electrode, a second strip electrode, a third strip electrode, and a fourth strip electrode, the first strip electrode to the fourth strip electrode of the first liquid crystal cell and the first strip electrode to the fourth strip electrode of the third liquid crystal cell have a first shape, and the first strip electrode to the fourth strip electrode of the second liquid crystal cell and the first strip electrode to the fourth strip electrode of the fourth liquid crystal cell have a second shape that is different from the first shape.

The application discloses a kind of liquid crystal device drive control method and liquid crystal drive controller, it is related to liquid crystal device technical field.Judgment is received amplitude specified value and whether the change of received amplitude specified value is generated in which method, and amplitude specified value is used to set the amplitude of liquid crystal drive signal for setting the liquid crystal device to drive;When amplitude specified value changes, the amplitude change amount between current received amplitude specified value and the amplitude specified value received at previous time and amplitude increasing or decreasing direction are determined, and signal adjustment duration and adjustment voltage are determined according to amplitude change amount and increasing or decreasing direction;In signal adjustment duration, the amplitude of liquid crystal drive signal sent to liquid crystal device is adjusted according to amplitude increasing or decreasing direction and amplitude change amount, and after signal adjustment duration ends, the liquid crystal drive signal of changed amplitude specified value is sent to liquid crystal device.The above scheme can improve the driving ability of liquid crystal device.

The present invention relates to the technical field of liquid crystal device preparation, and in particular to a preparation method for a self-assembled vertical alignment film, comprising: preparation of self-assembly solutions: dissolving poly(diallyldimethylammonium chloride) in deionized water to prepare a self-assembly solution A with a concentration of 0.5-10%, and dissolving long-chain alkyl sodium sulfonate in deionized water to prepare a self-assembly solution B with a concentration of 0.02-0.2 mg / mL; cleaning a substrate, and immersing same in the self-assembly solution A for 20-30 h; taking out the substrate, washing with deionized water, and blow-drying with high-purity nitrogen; then immersing the substrate in the self-assembly solution B for 5-100 min; taking out the substrate, washing with deionized water, and blow-drying with high-purity nitrogen; and when a film is prepared, carrying out surface alignment by using a rubbing method, to obtain the self-assembled vertical alignment film. The present invention has the advantages that a self-assembled film can be formed by immersing, in self-assembly solutions, a substrate modified with specific chemical materials, the preparation method is simple, and the stability is good.

This invention relates to a liquid crystal electrically controlled reflector capable of breaking the reflectivity limit, comprising, from front to back, a first liquid crystal device, a second liquid crystal device, a first reflective polarizer, and a second reflective polarizer. The main body of the first liquid crystal device is a first liquid crystal cell sandwiched with a first liquid crystal layer. The first liquid crystal layer is composed of negative liquid crystal doped with dichroic dyes. In its natural state, the negative liquid crystal molecules and the dichroic dye molecules are perpendicularly aligned, while in the driven state, the negative liquid crystal molecules drive the dichroic dye molecules to deflect along a second axis. The second liquid crystal device has a 90° optical rotation function in its natural state, but no optical rotation function in the driven state. This invention not only achieves efficient reflection of two beams of orthogonally polarized states simultaneously in its high-reflectivity operating mode, significantly improving the overall reflectivity, but also reduces the reflectivity to a minimum level in its low-reflectivity operating mode.

The present application relates to a kind of liquid crystal electrically controlled mirrors, including the absorption polarizer, first liquid crystal device, first reflective polarizer, second liquid crystal device, second reflective polarizer arranged in order from front to back;Define first axial, second axial as two axial parallel to mirror surface and mutually orthogonal, absorption polarizer has first transmittance T1 to first axial polarized light, and second transmittance T2 to second axial polarized light, T2 <T1;First liquid crystal device, second liquid crystal device have 90 ° optical rotation function in natural state, and no optical rotation function in the state of applying driving voltage;First reflective polarizer, second reflective polarizer can transmit first axial polarized light and reflect second axial polarized light.This kind of liquid crystal electrically controlled mirror not only can have higher reflectivity in high reflection state operating mode, but also can improve overall transmittance in its low reflection state operating mode.

A liquid crystal device is provided having at least two opposing transparent substrates, at least one liquid crystal switching layer sandwiched between the opposing substrates. The liquid crystal layer contains one or more polymerized photoreactive mesogens of formula I,R11-Sp11-X11[-A-Z]o-A11-CY11—CY12[—C—O]x[—O]y-A[-Z-A]p-X21-Sp21-R21  Iwherein R11, R21, A11, A, Z, X11, X21, Y11, Y12, Sp11, Sp21, o, p, x and y are as defined herein, and one or more nematogenic compounds. An electrode structure is provided on one or both of the opposing substrates, and one or more of the substrates are additionally provided with an optical grating or a lens structure adjacent to the liquid crystal switching layer.

The invention discloses a ferroelectric nematic phase liquid crystal device based on array electrode regulation and control and an electric field orientation method. The device comprises an upper glass substrate, an upper grid electrode, a ferroelectric nematic phase liquid crystal layer, a lower grid electrode and a lower glass substrate which are sequentially arranged in a laminated mode. By calculating the projection of the expected electric field direction in the cell thickness direction and based on the geometric position relation of the electrodes in the plane, the magnitude of the electric potential which should be applied to each electrode is calculated, electric field distribution with specific directions and angles is formed in the liquid crystal layer, ferroelectric nematic phase liquid crystal molecules are guided to generate directional arrangement in the electric field direction, and the liquid crystal display effect is improved. The controllable inclination of a molecule director is realized, the characteristics of high sensitivity and quick response of ferroelectric nematic liquid crystal to the electric field direction are fully utilized, the active regulation and control of the orientation state of liquid crystal molecules in a three-dimensional space are realized by accurately designing the potential gradient, and the ferroelectric nematic liquid crystal can be widely applied to the scenes of spatial light modulators, electro-optical scanning devices, phase regulators and the like.

The invention discloses an apparatus comprising: a material having a switchable refractive index; an electrode array for inducing an electric field in the material having a switchable refractive index wherein the electrode array comprises one or more concentric shape sets, each concentric shape set comprising an array of concentric shape electrodes electrically connected in series; and an electrical conductor for activating the one or more concentric shape sets in parallel; the radial width and pitch of the concentrically shaped electrodes are substantially uniform across at least one of the set of concentric shapes.

Aspects of the disclosure provide a liquid crystal (LC) device, a head mounted display (HMD) system, and a method of tuning the HMD system. The LC device includes a first electrode structure disposed on a first substrate with an elliptical shape. The first electrode structure includes parallel first segments connected by second segments. The LC device includes a plurality of first control electrodes electrically coupled with the first electrode structure. The plurality of first control electrodes is configured to form LC lenses at different positions. Each of the LC lenses at the different positions is formed when electrical signals are applied to a subset of the plurality of first control electrodes that is associated with the respective LC lens. The LC device includes a second electrode structure disposed on a second substrate and at least one second control electrode electrically coupled with the second electrode structure.

An object of the embodiments is to provide a liquid crystal device capable of suppressing moire. According to an embodiment, a liquid crystal device has a first liquid crystal cell and a second liquid crystal cell, each of which has a first electrode and a second electrode, a first alignment film, a third electrode and a fourth electrode, a second alignment film, and a liquid crystal layer between the first alignment film and the second alignment film, the first electrode and the second electrode in the first liquid crystal cell extend in a direction different from the first electrode and the second electrode in the second liquid crystal cell, and in each of the first liquid crystal cell and the second liquid crystal cell, the extending direction of the first electrode and the second electrode is orthogonal to the extending direction of the third electrode and the fourth electrode in plan view.

An electro-optical device includes: a common electrode to which a common potential is applied, a pixel electrode to which a signal potential is applied and which are disposed in a display region, a first electrode to which a first potential having a negative polarity with respect to the common potential is applied and which is disposed outside the display region, a second electrode to which a second potential having a positive polarity with respect to the common potential is applied and which is disposed outside the display region, and a liquid crystal layer disposed between the pixel electrode and the common electrode, between the first electrode and the common electrode, and between the second electrode and the common electrode. In plan view, a first distance between the first electrode and the display region is shorter than a second distance between the second electrode and the display region.

Disclosed is system with imaging unit(s) and processor(s), imaging unit(s) with image sensor of photo-sensitive cells; and light valve device having array of light valves. The processor(s) is configured to: control light valves to allow light to pass therethrough, while controlling remaining light valves in the array to stop allowing the light to pass therethrough, thereby casting shadows of remaining light valves on first part and second part in first set and second set of photo-sensitive cells, respectively; read out image signals from photo-sensitive cells; select pairs of photo-sensitive cells from first set and second set; for given pair, determine phase difference between image signals read out from photo-sensitive cells of first set and second set; and adjust focus distance of the imaging unit(s), based on phase differences.

The application provides a liquid crystal material-based ultra-wideband same-side coupling transition structure and relates to the field of liquid crystal devices. The strip lines in the same-side coupling transition structure are distributed on the same side of a liquid crystal layer. The coupling transition structure is composed of staggered vertical coupling strip lines which are mirror-symmetrically distributed on the upper and lower surfaces of a glass substrate. The four-port network of the design can be used to build an equivalent circuit of a directional coupler in the case of a non-uniform medium. The transmission of signals in and out of the glass layer of an electrically-controlled liquid crystal element is realized through the design of a cross-layer coupling transition structure, and the ultra-wideband working frequency band and low loss are realized.

A photosensitive composition containing: a polymer that contains a structural unit (a1) that is derived from a monomer having a C1-3 halogenated alkyl group containing at least one hydrogen atom and that has a hydroxyl group; and a photosensitive compound.

This disclosure relates generally to mixed reality, and more particularly to augmented reality systems and methods for the visually impaired. In one embodiment, an augmented-reality electronic glass apparatus is disclosed, comprising: a smart frame, comprising: a printed circuit board, a light emitting diode, a battery, and a communication module with integrated antenna; and a digital lens, comprising: a liquid crystal device display, a lens assembly, a magnetic stackable optic, an eye tracking system, a camera module, a lidar module, wherein the digital lens is magnetically attached to the smart frame.

To provide a chiral dopant which is optically reversible in a liquid crystal and has a good torsional force change width, a liquid crystal composition, and a liquid crystal element.SOLUTION: The chiral dopant is represented by formula (1). Wherein X1, X2, X3 and X4 are each independently benzene or cyclohexane, and R is each independently an alkyl group having 1 to 12 carbon atoms. ) SELECTED DRAWING: Figure 4