792 results about "Liquid crystal molecule" patented technology

The invention relates to the technical field of liquid crystal display driving control, and discloses a high-refresh-rate liquid crystal display driving method and system, and the method comprises the steps: a motion amount detection module calculates the motion intensity of a dynamic region through inter-frame comparison; the voltage excitation adjusting module applies voltage according to dynamic / static region differentiation, and the dynamic region adopts asymmetric voltage to increase the response speed; the gray scale adjustment module dynamically optimizes the voltage amplitude based on the local contrast so as to smooth the gray scale; the self-adaptive refresh rate module fuses the motion intensity and the image type to switch a refresh rate gear; and the charge balance management module intelligently triggers regional reverse voltage pulses in a static scene to eliminate ghosting. The system eliminates ghost shadows through multi-module cooperation and dynamic charge balance management, intelligently switches refresh rate gears based on motion intensity and cooperates with voltage regulation to reduce static power consumption, adopts regional gray scale compensation to optimize detail display, and combines asymmetric high-voltage driving to improve the response speed of liquid crystal molecules.

The invention discloses a liquid crystal compound, a liquid crystal composition and a phase difference film, relates to the technical field of liquid crystal display, and aims to solve the problems of poor alignment order degree, low n value and low crosslinking completion degree in an existing liquid crystal system. The structural general formula (I) of the liquid crystal compound is set, and the liquid crystal compound is applied to the phase difference film. According to the liquid crystal compound, a long liquid crystal main chain is adopted, so that liquid crystal molecules are arranged more orderly, dense chromophoric group arrangement is achieved, Van der Waals force and hydrogen-bond interaction among the liquid crystal molecules are improved, the alignment order degree and the n value are improved, and the purposes of improving dispersion, lowering the manufacturing cost, lowering the film thickness requirement and improving the crosslinking completion degree are achieved.

The invention relates to the technical field of liquid crystal display, and provides liquid crystal display equipment based on a field order and a color image display method. An image to be displayed can be decomposed into three sub-frames based on a field sequential display technology, each sub-frame corresponds to a color field, when a liquid crystal panel is driven according to a main color gray scale value of the color field corresponding to each sub-frame, at least one backlight source corresponding to each color field is firstly driven to emit backlight of a first duration within a time period when liquid crystal molecules reach a steady state, and then the backlight source corresponding to each color field is driven to emit backlight of a second duration within a time period when the liquid crystal molecules reach the steady state. The white light of the second duration is emitted after the first duration, so that the white light is added in the backlight lightening stage of each color field, the color gamut range of the color field corresponding to each sub-frame is effectively reduced, and the color separation phenomenon is reduced. In addition, each subframe corresponds to a single color field or a mixed color field, so that the color separation phenomenon in various algorithms can be improved.

The utility model discloses a liquid crystal phased array based on a bidirectional switch. Comprising an upper quartz glass substrate, a lower quartz glass substrate, a liquid crystal medium arranged between the upper quartz glass substrate and the lower quartz glass substrate, polyimide films arranged above and below the liquid crystal medium, a Z-direction direct current bias network arranged on the upper surface of the lower quartz glass substrate, and a one-to-many power divider, the Y-direction direct current bias network is arranged on the lower surface of the lower quartz glass substrate, the metal ground is arranged on the lower surface of the upper quartz glass substrate, and the antenna units are coupled with the one-to-multiple power divider. Wherein the Z-direction direct-current bias network is controlled to apply a longitudinal electric field to the liquid crystal molecules, and the Y-direction direct-current bias network is controlled to apply a transverse electric field to the liquid crystal molecules. The utility model provides a liquid crystal phased array with quick response, which can obviously improve the performance index of a reconfigurable millimeter wave phased array system and is very beneficial to the integration and development of the reconfigurable millimeter wave system.

The invention relates to the technical field of optical devices, and provides a tunable metasurface structure, an imager and a target recognition method, the tunable metasurface structure comprises a first electrode layer, a second electrode layer, a liquid crystal layer and a metasurface layer; voltage is applied to the first electrode layer and the second electrode layer to control the turning direction of liquid crystal molecules in the liquid crystal layer so as to adjust the polarization state of light in an incident image; the metasurface layer performs different responses on light rays in different polarization states through polarization multiplexing, a left-hand circular polarization state and a right-hand circular polarization state are used for encoding positive and negative values of weights, and a multi-channel A * A light spot matrix is generated through spatial multiplexing, so that an emergent feature image is determined through the light spot matrix; different light spot brightness in the light spot matrix is used for representing different convolution kernel weights. The metasurface and the liquid crystal are combined to obtain a tunable structure, various coding information can be processed, and therefore the object recognition accuracy and robustness are improved.

The invention provides a liquid crystal display lightening parameter self-adaptive calibration method, and relates to the technical field of image display. The method comprises the following steps: firstly, establishing a characteristic matrix and a parameter library of liquid crystal molecules, and dynamically correcting according to a real-time working state; and based on the characteristic matrix and the parameter library, executing pixel-level forward prediction on the input image, and generating a color error distribution diagram by solving a coupling solution of a liquid crystal molecule dynamic response differential equation and a backlight attenuation compensation equation. And taking the error distribution diagram as input, obtaining a gradient optimization direction of the calibration parameter mapping diagram through back propagation calculation, and iteratively approaching the optimal pixel value compensation amount in each frame period. And injecting a test pulse into the characteristic pixel point, capturing a voltage response curve through a sampling circuit, and converting the voltage response curve into a real-time correction value mapping graph. And finally, carrying out weighted fusion on the real-time correction value mapping graph and the pixel value compensation amount to generate a calibration parameter mapping graph. The self-adaptive calibration of the display parameters is improved, and the display consistency and the color accuracy are effectively improved.

Disclosed is a liquid crystal composition. The liquid crystal composition includes liquid crystal molecules including at least one of a liquid crystal compound having an alkenyl group and a liquid crystal compound having an alkoxy group, and a first stabilizer including a compound having a structure represented by Formula 1:where n is 0 or 1; m is 0 or 1; k is 0 or 1; Z1, Z2, and Z3 are each independently a single bond, —C═C—, —OCO—, —COO—, —CF2O—, or a C1 to C5 alkylene group; X1, X2, X3, and X4 are each independently hydrogen or halogen; Y is hydrogen, an alkylene group, an alkoxy group, a hydroxyl group, —NHCOCH3, or ═O; and A and B are cyclic compounds.

The present disclosure provides an alignment method and application of a cyanobiphenyl liquid crystal composite doped with an organic donor material. The organic small molecule is doped in the host cyanobiphenyl liquid crystal, and the small molecule donor / cyanobiphenyl liquid crystal mixture is directionally induced to assemble by virtue of the large surface energy difference between the superhydrophobic structured substrate and the superhydrophilic flat substrate. The liquid crystal molecules form a uniform arrangement under the action of the liquid bridge, driving the self-assembly of the small molecule donor to be embedded in the cyanobiphenyl liquid crystal, forming a structure of electron donor-donor, enhancing the conductivity of the liquid crystal composite device, studying the influence of the surface tension of the solvent on the performance of the composite, and giving a direction for the selection of the solvent. Compared with the methods of inducing the alignment of liquid crystal molecules and donor small molecules by using electric fields, magnetic fields, photolithography, capillary methods, etc., this method is simpler and more feasible, easy to transfer, the circuit pattern is easy to design, and has good stability.

The invention provides a display module and a display device, and the display module comprises a display panel which comprises a plurality of pixel units arranged in an array; the light control device is arranged on the light emitting side of the display panel, the light control device comprises a first regulation and control layer and a second regulation and control layer which are sequentially arranged on the display panel in a stacked mode, the first regulation and control layer comprises a first refraction layer and a second refraction layer covering the first refraction layer, the first refraction layer comprises a plurality of lenses arranged in an array mode, and the second refraction layer comprises a second refraction layer covering the second refraction layer; the orthographic projection of each lens on the display panel at least covers two pixel units, the refractive index of the first refraction layer is larger than that of the second refraction layer, when the display module is in a three-dimensional display state, liquid crystal molecules in the second regulation and control layer do not deflect, and when the display module is in a two-dimensional display state, liquid crystal molecules in the second regulation and control layer do not deflect. And the second regulation and control layer is equivalent to a plurality of lens units arranged in one-to-one correspondence with the lenses. The display module provided by the embodiment of the invention can reduce view crosstalk in a three-dimensional display state.

An electronic device includes a first dimming device and a second dimming device. The first dimming device includes a first dimming module having a first liquid-crystal layer and a second dimming module having a second liquid-crystal layer. The second dimming device includes a third dimming module having a third liquid-crystal layer and a fourth dimming module having a fourth liquid-crystal layer. The liquid-crystal molecules of the first liquid-crystal layer have a first alignment angle, the liquid-crystal molecules of the third liquid-crystal layer have a third alignment angle, and the first alignment angle is different from the third alignment angle.

The invention provides a display control method and system for a liquid crystal display screen, and the method comprises the steps: carrying out the nonlinear spectrum mapping processing of an input RGB drive value, and obtaining a theoretical emission spectrum through combining with the response characteristics of liquid crystal molecules; calculating a reflection spectrum component in the multilayer structure according to the ambient light spectrum, and superposing the reflection spectrum component with the theoretical emission spectrum to obtain an actual observation spectrum; calculating a difference value between the actual observation spectrum and the target spectrum, and converting the difference value into an RGB correction value through a constraint optimization algorithm to obtain an RGB driving value after ambient light compensation; and calculating actual white point color coordinates, and adjusting the actual white point color coordinates to a standard white point position through a progressive white point migration algorithm. Display parameters can be dynamically adjusted according to real-time ambient light conditions, the influence of ambient light reflection on colors is effectively compensated, meanwhile, color temperature consistency and color accuracy are ensured through white point correction, the display quality under different ambient lights is remarkably improved, and the visual experience of a user is improved.

A liquid crystal optical element includes an optical function layer and two transparent substrates. The optical function layer is sandwiched between two transparent substrates. The optical function layer contains liquid crystal molecules and a photoisomerization material. The liquid crystal optical element switches between a light-transmitting state and a light-scattering state according to an orientation state of the liquid crystal molecules. The optical function layer holds the liquid crystal molecules and the photoisomerization material within a mesh structure formed of a resin-particle aggregate. Therefore, light can be strongly scattered when the liquid crystal optical element is in a screen state, and a high-contrast image is obtained when visible light is projected onto the liquid crystal optical element.

The embodiment of the invention belongs to the display technology, and provides liquid crystal display equipment and a black frame insertion display method. The liquid crystal display device comprises a display panel, a backlight module, a time sequence control panel and a processor. The backlight module comprises a driving circuit and a backlight source. The processor divides the refresh time into a plurality of sub-frame times, and further determines the driving time corresponding to the pixel point and the target driving voltage corresponding to the driving time according to the first gray scale, the second gray scale, and the corresponding relationship between the preset gray scale corresponding to the sub-frame time and the driving voltage; and according to the number of the driving times corresponding to the pixel points, determining target black frame insertion time, so that the target black frame insertion time is shorter than the original black frame insertion time. The time sequence control panel controls the display panel to refresh in the sub-frame time, and target driving voltage is applied to the liquid crystal molecules in the driving time; and the driving circuit turns off the backlight source within the target black frame insertion time. According to the scheme, the determined target black frame insertion time is smaller than the original black frame insertion time, so that the display brightness is improved.

The present application discloses a liquid crystal compound, a liquid crystal composition, and a retardation film, relating to the technical field of liquid crystal displays. In order to solve the problems of poor alignment order degree, low Δn value, and low crosslinking completion degree in the existing liquid crystal system, the present application sets the structural general formula (I) of the liquid crystal compound and applies it to the retardation film. The liquid crystal compound of the present application adopts a longer liquid crystal main chain, making the arrangement of liquid crystal molecules more orderly. The dense arrangement of chromogenic groups increases the van der Waals force and hydrogen bond interaction between liquid crystal molecules, thereby improving the alignment order degree and Δn value, achieving the purpose of improving dispersion, reducing manufacturing costs, reducing the film thickness requirement, and improving the crosslinking completion degree.

The invention discloses a laser depilation dynamic parameter adjustment method based on skin typing recognition, and relates to the technical field of laser depilation, and the method comprises the steps: constructing a three-dimensional skin model of a depilation region through multi-dimensional data cross validation; detecting local pigmentation caused by friction in each area; detecting the blood flow signal intensity of capillary vessels around the hair follicles, judging the period of the hair and generating a hair follicle activity thermodynamic diagram in real time; a three-dimensional energy focus is formed through double-beam crossing; skin curved surface data are obtained through a pressure sensor, liquid crystal molecules in a light valve are driven to be arranged, and light spots are adjusted to be in the shape attached to an unhairing area; the basal metabolic rate of the patient is measured through a noninvasive bioelectrical impedance analysis technology, and the energy density is adjusted based on the basal metabolic rate; and establishing a digital twinborn model, and integrating depilation data, skin state and hormone level information. A three-dimensional energy focus is formed through double-beam crossing, energy is accurately focused on the root of the hair follicle, and epidermis damage is avoided.

The invention provides a volume holographic grating preparation method, a volume holographic grating, an optical waveguide and a display device, and the method comprises the steps: obtaining a to-be-exposed holographic material which comprises a thermosetting liquid crystal material; providing a liquid crystal box, and filling the liquid crystal box with the holographic material to be exposed; based on a preset light source, performing exposure treatment on the holographic material to be exposed in the liquid crystal box to obtain a grating to be treated; and applying a preset electric field to the to-be-processed grating and heating the to-be-processed grating to which the preset electric field is applied so as to cure the thermosetting liquid crystal molecules oriented by the preset electric field in the to-be-processed grating, thereby obtaining the volume holographic grating. According to the volume holographic grating, the arrangement state stability of the liquid crystal molecules of the volume holographic grating at a relatively high temperature can be improved, so that the diffraction efficiency of the volume holographic grating is ensured, and the optical performance degradation of the volume holographic grating in a high-temperature state is avoided.

The invention discloses a liquid crystal screen fault detection method and system, and relates to the technical field of liquid crystal screen fault detection, and the method comprises the following steps: employing a uniform grid division method to divide a whole liquid crystal screen display region into a plurality of sub-regions with the same area, enabling each sub-region to comprise a plurality of pixel points, a standard gray scale pattern is configured for each sub-region to ensure that all the sub-regions are subjected to unified driving stimulation; a control circuit is used for applying step-by-step changing driving voltage to the liquid crystal screen, so that each sub-region changes according to a preset gray-scale pattern under a unified time sequence, and liquid crystal molecules are driven to rotate and generate optical response. According to the method, accurate identification and dynamic amplification of nonlinear response coupling of the liquid crystal screen are realized through sub-region-level response modeling and a disturbance driving strategy, the detection capability of hidden defects is improved, the method is suitable for high-reliability display scenes such as vehicle-mounted display scenes and aviation display scenes, and the stability and the safety of a display system are guaranteed.

The invention provides a photo-thermal response T-type liquid crystal molecule, a preparation method thereof and application of the photo-thermal response T-type liquid crystal molecule to an intelligent window. The structural formula of the T-type liquid crystal molecule is shown in the formula (1). According to the technical scheme, the liquid crystal molecule is in a T type, an azobenzene structure in the liquid crystal molecule is subjected to reversible conversion of cis and trans under switching of ultraviolet light and visible light, and meanwhile, a molecular structure of 8CB and a butylene adipate structure can be subjected to phase change at room temperature, so that the molecule has a light response function, and meanwhile, the light response effect of the molecule is improved. The material also has a thermal response function at room temperature; besides passive control through light and heat, after electrification, liquid crystal molecules are arranged in order, an electric response function is achieved, and the intelligent window can be actively recovered to be transparent. The molecule not only has multiple responses, but also is a low-carbon environment-friendly material. According to the technical scheme, the alkoxy chain is linked to the side chain of the liquid crystal molecule, asymmetry is increased, the liquid crystal molecule has a richer phase structure, and the liquid crystal molecule has a huge development prospect in the field of intelligent windows.

The present invention relates to a liquid crystal light modulating device comprising substrates coated with a transparent conductive layer and a liquid crystal composition sandwiched between the substrates with a dichroic dye added; the resulting liquid crystal light modulating device can exist in at least two stable states that remain substantially stable after removal of a voltage, wherein at least one of them is the liquid crystal molecules arranged in a substantially ordered manner, and at least one of them is the liquid crystal molecules arranged in a multi-domain and disordered manner; the applied voltage makes the arrangement of liquid crystal molecules can be quickly switched between the above stable states, and different liquid crystal molecule arrangements from the stable states can be obtained; the above liquid crystal light modulating device for incident light can be adjusted between the minimum absorption and minimum scattering state of high clarity and transparency to the maximum absorption and maximum scattering state of the private state, and at the same time realizes the zero-power privacy protection and zero-power clarity and transparency of the two states, and obtains the excellent regulation of the sun's radiant energy and energy-saving light modulating glass that can quickly switch between transparent and privacy-protecting states.

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 invention discloses an automatic focusing method and system based on a TFT liquid crystal panel, and particularly relates to the technical field of TFT liquid crystal panels. By acquiring image data of a shooting scene, calculating an optimal focal length adjustment parameter and applying a control voltage to dynamically adjust the refractive index of a liquid crystal panel, focus adjustment of an optical system is realized, an adjusted image is acquired, image quality is compared by using a definition evaluation algorithm, if the definition does not reach a preset threshold value, voltage control is iteratively optimized, and the image quality is improved. And after the focus is determined, the system maintains the current voltage state, and the focusing process is automatically optimized in combination with a scene change detection mechanism. The problems of optical distortion, halo, aberration and the like caused by the uniformity and response characteristics of liquid crystal molecules in the optical adjustment process of an existing liquid crystal panel are solved; the automatic focusing method and the automatic focusing device are particularly suitable for high-resolution and large-aperture application scenes, and stability and adaptability of automatic focusing are improved.

The invention discloses an LCoS device and a phase modulation method of the LCoS device. The LCoS device comprises a transparent electrode, a liquid crystal layer, a metasurface layer and a back plate which are sequentially arranged from the incident end to the reflecting end. A projection included angle is formed between the long axis of the metasurface layer and the liquid crystal molecule director of the liquid crystal layer on a propagation plane; the liquid crystal layer is used for performing phase modulation on a parallel first polarization component of incident light, and the conversion metasurface is used for performing polarization state exchange on the parallel first polarization component and an orthogonal second polarization component of the incident light; the back plate is used for reflecting incident light; and the liquid crystal layer is used for performing phase modulation on the exchanged second polarization component, so that the emergent first polarization component and the emergent second polarization component are subjected to phase modulation. The metasurface layer is introduced, a polarization-dependent modulator is converted into a polarization-independent modulator through two times of liquid crystal layer passing and one time of polarization conversion, and the fundamental limitation of a traditional LCoS device is solved.

A liquid crystal micro-lens array comprises m1 first electrode strips and m2 second electrode strips, the orthographic projection of each second electrode strip on a liquid crystal layer intersects with the orthographic projection of each first electrode strip on the liquid crystal layer, 1-n1 voltage signals are fed into the m1 first electrode strips respectively, 1-n2 voltage signals are fed into the m2 second electrode strips respectively, by controlling the voltage value of each voltage signal, the rotation angle of the liquid crystal molecules of the liquid crystal box at the position can be changed, annular phase delay distribution is formed, and therefore a curved surface micro lens is formed at every n1 * n2 intersection points. The first electrode strip and the second electrode strip are of a strip-shaped structure, manufacturing is simple, the size of n1 and n2 is controlled, the shape and size of the curved-surface micro lens can be controlled, and the regulation and control precision is high. The invention further provides a driving method of the liquid crystal microlens array and a near-to-eye display system comprising the liquid crystal microlens array.

The present application relates to a liquid crystal dimming device, comprising a substrate coated with a transparent conductive layer and a liquid crystal composition with a dichroic dye added thereto sandwiched between the substrates; the resulting liquid crystal dimming device can have at least two stable states that remain basically stable after the voltage is removed, at least one of which is that the arrangement of liquid crystal molecules is basically orderly, and at least one is that the arrangement of liquid crystal molecules is multi-domain and disordered; an external voltage is applied so that the arrangement of liquid crystal molecules can be quickly switched between the above-mentioned stable states, and a liquid crystal molecule arrangement different from the stable state can also be obtained; the above-mentioned liquid crystal dimming device can adjust the incident light between a highly clear and transparent minimum absorption and minimum scattering state to a privacy state of maximum absorption and maximum scattering state, while realizing zero power consumption privacy protection and zero power consumption clear and transparent states, obtaining excellent solar radiation energy regulation and energy-saving intelligent dimming glass that can quickly switch between high-definition transparent and privacy protection states.

The present invention relates to the technical field of liquid crystal display drive control, and discloses a driving method and system for a high refresh rate liquid crystal display screen. The method includes: a motion amount detection module calculates the motion intensity of the dynamic area through inter-frame comparison; a voltage excitation adjustment module applies voltages differentially according to the dynamic / static areas, and the dynamic area uses asymmetric voltages to improve the response speed; a gray scale adjustment module dynamically optimizes the voltage amplitude based on the local contrast to smooth the gray scale; an adaptive refresh rate module fuses the motion intensity and the image type to switch the refresh rate gear; a charge balance management module intelligently triggers sub-region reverse voltage pulses in a static scene to eliminate afterimages. The system eliminates afterimages through the cooperation of multiple modules, dynamically manages charge balance, intelligently switches the refresh rate gear based on the motion intensity, and cooperates with voltage regulation to reduce static power consumption, adopts sub-region gray scale compensation to optimize the detail display, and combines asymmetric high-voltage drive to improve the response speed of liquid crystal molecules.

The invention discloses a uniform Bessel beam drilling device, and relates to the technical field of optical devices, the uniform Bessel beam drilling device mainly comprises a light generation device, a liquid crystal optical element and a regulation and control device, the light generation device is used for generating circularly polarized light and transmitting the circularly polarized light to the liquid crystal optical element; the arrangement mode of liquid crystal molecules in the liquid crystal optical element can be changed through the light-operated orientation technology, the liquid crystal optical element modulated through the light-operated orientation technology can receive circularly polarized light and form uniform Bessel light, and the liquid crystal optical element can have the function of a lens after being modulated through the light-operated orientation technology. Uniform Bessel light can be converged; the regulation and control device comprises a focusing optical element, and the focusing optical element can converge the uniform Bessel light emitted by the liquid crystal optical element again. The invention further discloses a uniform Bessel light drilling method which is implemented by adopting the uniform Bessel light beam drilling device, the energy utilization rate can be improved, the drilling effect is good, and the light path is simple.

The invention discloses a display method and device of an LCD display screen and electronic equipment, and relates to the field of data processing. In the method, to-be-displayed picture data are obtained, and the picture data comprise a plurality of continuous picture frames; analyzing the picture data, and determining a difference area between the first picture frame and the second picture frame, the first picture frame and the second picture frame being any two adjacent picture frames in a plurality of continuous picture frames; dividing the difference region into a plurality of sub-regions according to the position and the size of the difference region; determining the pixel value variation amplitude corresponding to each sub-region, and adjusting the driving voltage of the liquid crystal molecules in each sub-region based on the pixel value variation amplitude; and after the liquid crystal molecule driving of each sub-region is completed, carrying out refresh display on the LCD display screen, and displaying a picture corresponding to the current frame. By implementing the technical scheme provided by the invention, the display efficiency is improved.

The embodiments of the present application relate to the technical field of optical communications. Disclosed are a spatial light modulator, a wavelength selective switch, an optical communication device, and a system. The spatial light modulator comprises a first modulation assembly and a second modulation assembly, which are sequentially disposed in a specific direction. The first modulation assembly comprises a first common electrode, a first pixel electrode array, and a first liquid crystal layer located between the first common electrode and the first pixel electrode array, wherein liquid crystal molecules in the first liquid crystal layer are arranged in a periodic fan-shaped columnar shape in a plane perpendicular to the direction of incidence of optical signals. The second modulation assembly comprises a second common electrode, a second pixel electrode array, and a second liquid crystal layer located between the second common electrode and the second pixel electrode array, and further comprises a metasurface layer, a reflecting layer and a CMOS silicon-based backplane, which are sequentially disposed in the specific direction, wherein pixel electrodes in the second pixel electrode array are electrically connected to the CMOS silicon-based backplane. The spatial light modulator has polarization-independent phase response characteristics, and enables fast and crosstalk-free switching of an output port for optical signals when applied to a wavelength selective switch.

The invention discloses a phase modulation method of an achromatic liquid crystal holographic lens, and belongs to the technical field of holographic optics. According to the method, the spatial orientation distribution of liquid crystal molecules is regulated and controlled, a multi-wavelength phase modulation model is constructed, and synchronous focusing of red light, green light and blue light is achieved. The method specifically comprises the following steps: calculating a liquid crystal molecule deflection angle according to an incident light wavelength and a lens position to form refractive index gradient distribution; holographic phase distribution is generated based on molecular orientation, and light rays with different wavelengths are focused to the same focus; the three-wavelength focus light intensity deviation is controlled by dynamically optimizing the phase intensity coefficient and combining finite element simulation iteration adjustment. According to the invention, the chromatic aberration phenomenon of a traditional lens is eliminated, confocal plane focusing of light with different wavelengths within a certain focal length range is realized, and the focus intensity consistency is improved. The prepared ultrathin liquid crystal lens is low in thickness, obviously improves the light focusing efficiency, and is suitable for a high-precision imaging system and display equipment.

The embodiment of the invention discloses a spatial light modulator, a wavelength selection switch, optical communication equipment and a system, and relates to the technical field of optical communication, and the spatial light modulator comprises a first modulation assembly and a second modulation assembly which are sequentially arranged along a specific direction. The first modulation assembly comprises a first common electrode, a first pixel electrode array and a first liquid crystal layer located between the first common electrode and the first pixel electrode array. Liquid crystal molecules in the first liquid crystal layer are periodically arranged in a fan-column shape in a plane perpendicular to the incident direction of an optical signal. The second modulation assembly comprises a second common electrode, a second pixel electrode array and a second liquid crystal layer located between the second common electrode and the second pixel electrode array, and further comprises a super surface layer, a reflecting layer and a CMOS silicon-based backboard which are sequentially arranged in the specific direction. And pixel electrodes in the second pixel electrode array are electrically connected with the CMOS silicon-based back plate. The spatial light modulator has a polarization-independent phase response characteristic, and when the spatial light modulator is applied to a wavelength selective switch, output port switching of optical signals can be rapidly achieved without crosstalk.