49 results about "Cholesteric liquid crystal" patented technology

The application discloses a liquid crystal coating composition resistant to writing and stable in high-temperature driving and a preparation method thereof. The composition comprises a cholesteric liquid crystal, a high-molecular prepolymer mixture of organic silicon modified polyurethane acrylate and modified polyurethane acrylate in a specific ratio, spacer particles, an active monomer mixture, a photoinitiator, an antioxidant and an auxiliary agent. The application optimizes the resin system, so that the cured coating has high mechanical strength and toughness, and the resistance to repeated writing times is increased to more than 1150 times. Meanwhile, the formula is extremely insensitive to temperature changes, and the critical driving voltage at 45 DEG C high temperature only slightly increases by about 0.6 V compared with normal temperature, which is far lower than the increase of about 6.9 V of common products, thereby ensuring the thoroughness and response speed of handwriting erasing in a high-temperature environment. The preparation process of the application is simple, and is suitable for producing liquid crystal handwriting film products with high performance and high reliability.

This invention relates to the field of cholesteric liquid crystal display technology. The invention discloses a cholesteric liquid crystal display device and its fabrication method. By using a dam structure to divide a single-layer liquid crystal cell into multiple pixel regions, and by injecting liquid crystal material containing a photosensitive chiral agent, selective exposure processing can form multiple cholesteric liquid crystals with different pitches in situ within a single liquid crystal layer, each reflecting different colors of light. This achieves full-color display in a single-layer structure, significantly simplifying the device structure, reducing overall thickness and manufacturing costs, and minimizing light loss due to light penetration through multiple layers. Furthermore, during processing, only two liquid crystal injections are required, along with illumination processing, to obtain three pixel regions reflecting different colors, greatly reducing the number of device processing steps.

This application relates to the field of liquid crystal display technology, specifically to a reflective liquid crystal display panel and its preparation method, and a reflective liquid crystal display device. The reflective liquid crystal display panel includes a first substrate, a liquid crystal layer, and a second substrate stacked sequentially. The raw material components of the cholesteric liquid crystal composition include nematic liquid crystal, a hydrophobic first chiral compound, and a hydrophilic second chiral compound, with opposite optical rotations between the first and second chiral compounds. A hydrophilic interface is formed on the side of one of the first and second substrates facing the liquid crystal layer. This overcomes the limitation that the theoretical reflectivity of a single optically active cholesteric liquid crystal does not exceed 50%, improving overall reflectivity and display brightness. Because the components with different optical rotations are vertically layered within the same continuous liquid crystal phase, rather than forming an independent double-layer structure through external bonding, there are no obvious independent mechanical interfaces between the layers, reducing light scattering loss and improving optical coupling efficiency.

The present invention relates to the technical field of liquid crystal display, and specifically relates to a cholesteric liquid crystal composition and the use thereof. The cholesteric liquid crystal composition of the present invention comprises one or more compounds as represented by general formula I below, one or more compounds as represented by general formula II below, one or more compounds as represented by general formula III below, one or more compounds as represented by general formula IV below, one or more compounds as represented by general formula V below, and one or more compounds as represented by general formula VI below. The cholesteric liquid crystal composition of the present invention has the characteristic that the central reflection wavelength thereof has good temperature stability due to the synergistic effect among the compounds as represented by general formulas I-VI, which is embodied in that within the range of 0-50°C, the variation of the central reflection wavelength does not exceed 5 nm; and the cholesteric liquid crystal composition is particularly suitable for a cholesteric bistable display, and can improve the display effect of existing bistable displays in a relatively wide temperature range.

This invention relates to the field of functional liquid crystal materials technology, and discloses a method for preparing and applying a spiropyran-based ionic conductive cholesteric phase liquid crystal elastomer with multimodal sensing characteristics. This liquid crystal elastomer is prepared by co-polymerization of a spiropyran derivative as the core unit for photo / thermal / mechanical response with polymerizable liquid crystal monomers, chiral agents, thiol crosslinking agents, ionic liquids, and initiators. Its core mechanism is that the microscopic isomerization of spiropyran molecules is amplified into a change in the mesoscopic polymer arrangement through intermolecular synergistic effects. Simultaneously, relying on the intrinsic conductivity difference between the ionic anthocyanin (MC) and non-ionic spirocyclic (SP) phases, precise control of macroscopic conductivity is achieved. This composite material achieves multiple responses with a single spiropyran component, enabling the construction of multimodal flexible sensors. It addresses the pain points of complex structures and poor compatibility in traditional sensors, and has significant research value in fields such as smart wearables, electronic skin, and healthcare.

This invention relates to the field of liquid crystal display technology, specifically to a cholesteric liquid crystal composition and its application. The cholesteric liquid crystal composition of this invention comprises one or more compounds represented by general formula I, one or more compounds represented by general formula II, one or more compounds represented by general formula III, one or more compounds represented by general formula IV, one or more compounds represented by general formula V, and one or more compounds represented by general formula VI. Through the synergistic effect between the compounds represented by general formulas I to VI, the cholesteric liquid crystal composition of this invention exhibits good temperature stability of the primary reflection wavelength, specifically, the variation in primary reflection wavelength does not exceed 5 nm within the temperature range of 0℃ to 50℃. It is particularly suitable for cholesteric bistable displays and can improve the display performance of existing bistable displays over a wider temperature range.

This invention provides a circular polarizing eye-protecting AB adhesive, relating to the field of adhesive production technology. This circular polarizing eye-protecting AB adhesive is prepared by mixing and stirring component A and component B. Component A consists of the following raw materials: epoxy resin composite; modified epoxy acrylate prepolymer; cholesteric liquid crystal-epoxy hybrid microspheres; fluorescent dye; anti-aging agent; and acid-free optical grade additives. Component B consists of the following raw materials: amine curing agent; dihedral naphthalenedicarboximide derivative containing amine groups; aminosilane coupling agent; polyetheramine accelerator; and triphenyl phosphite anti-yellowing agent. This invention can be widely applied to the protection and optical optimization of various screens such as smartphones, tablets, automotive displays, and wearable devices, and has significant practical value and industrialization prospects.

The utility model discloses a kind of cholesteric liquid crystal display devices, lower substrate is equipped with multiple gate lines extending along first direction and multiple source lines extending along second direction in liquid crystal layer side, and pixel array formed by multiple pixel units is formed by multiple gate lines and multiple source lines, each pixel unit includes display area and non-display area, upper substrate is equipped with light absorption layer in liquid crystal layer side away, and light absorption layer includes opening area corresponding with the display area of pixel unit and light absorption area corresponding with non-display area. By setting light absorption layer corresponding with the non-display area of pixel unit on the outer surface of upper substrate, so that the light of incident non-display area is absorbed by light absorption layer, reduce the surface reflectivity of display device, improve the color saturation and contrast of cholesteric liquid crystal display, to effectively improve the display effect of product.

This invention relates to the field of liquid crystal energy-saving window device technology, and particularly to a templated polymer-stabilized cholesteric liquid crystal energy-saving window device, its preparation method, and its application. This invention combines an infrared-band polymer template with adjacent-band cholesteric liquid crystals to achieve a single-layer structure that broadens the infrared Bragg reflection bandwidth. It also combines a visible-band polymer template with cholesteric liquid crystals of different bands to achieve a single-layer structure with multi-band Bragg reflection, thereby improving device transparency and reducing cost. By applying cholesteric liquid crystals of different Bragg reflection bands to the device structure, and by controlling the energy of the transmitted light beam and the tristable switching of the scattering transparency in the visible to infrared bands through temperature and electric field modulation, the response sensitivity is improved and energy consumption is reduced.

Provided are a polarizing plate and an optical display device comprising same, the polarizing plate comprising: a polarizer; a retardation layer laminated on the lower surface of the polarizer; and an upper protective layer laminated on the upper surface of the polarizer, wherein the polarizing plate has an orthogonal transmittance of 1% or less at a wavelength of 600 nm, the retardation layer comprises a cholesteric liquid crystal layer, an angle formed by the slow axis at a wavelength of 450 nm with respect to the slow axis at a wavelength of 550 nm of the cholesteric liquid crystal layer is 5° or less, an angle formed by the slow axis at a wavelength of 650 nm with respect to the slow axis at a wavelength of 550 nm of the cholesteric liquid crystal layer is 5° or less, and the upper protective layer has a total haze of 5 to 25%.

This application relates to a cholesteric liquid crystal display device and a scanning driving method thereof. The application provides a scanning driving method for a cholesteric liquid crystal display device, wherein the cholesteric liquid crystal display device includes a cholesteric liquid crystal display panel and a driving circuit section, and the cholesteric liquid crystal display panel includes multiple scan lines, each scan line having multiple pixel circuits. The method includes: executing a specific scanning program using the driving circuit section to sequentially activate the scan lines, wherein for each activated scan line, the specific scanning program includes at least a first stage, and the first stage includes a first period, a second period, and a third period arranged sequentially; and during the third period of the first stage, using the driving circuit section to apply a bright-state voltage curve and a dark-state voltage curve respectively to the pixel circuits located on the first activated scan line using a first voltage amplitude and a second voltage amplitude. The first voltage amplitude is lower than the second voltage amplitude.

This invention relates to the field of optical anti-counterfeiting technology, specifically to an optical anisotropic element and its usage and application. It comprises a first photoalignment layer, a first optical retardation layer, a cholesteric liquid crystal layer, a second photoalignment layer, and a second optical retardation layer, stacked sequentially. The optical anisotropic element of this invention, comprising the sequentially stacked first photoalignment layer, first optical retardation layer, cholesteric liquid crystal layer, second photoalignment layer, and second optical retardation layer, allows for independent display of different invisible patterns on both the front and back sides, significantly increasing information capacity and anti-counterfeiting complexity, and solving the problem of limited information on one side in traditional single-sided anti-counterfeiting methods. The cholesteric liquid crystal layer in this invention is obtained by stacking cholesteric liquid crystal layers with two peak wavelengths, and the absolute value of the difference between the two peak wavelengths is ≥15nm. This further expands the element pattern from simple positive and negative switching to different color switching, further enhancing visual recognition and anti-counterfeiting security.

According to one embodiment, a display device includes a transparent substrate having a first main surface and a second main surface, a display element, a first optical element facing the display element, and a second optical element spaced apart from the first optical element. Each of the first optical element and the second optical element includes a first liquid crystal layer containing a first cholesteric liquid crystal and a second liquid crystal layer containing a second cholesteric liquid crystal. The second liquid crystal layer overlaps the first liquid crystal layer in the first optical element. In the second optical element, the first liquid crystal layer and the second liquid crystal layer are arranged on the second main surface.

The present invention relates to a cholesteric liquid crystal display, a micro processing unit, and a method for hybrid driving. The cholesteric liquid crystal display comprises a display panel and a micro processing unit. First, a grayscale threshold value needs to be set in advance. The micro processing unit will change the grayscale value of the display unit exceeding the grayscale threshold value to the new grayscale value displayed by the bright state color, and display the image by the DDS driving mode. Then the micro processing unit drives the display image in the PWM drive mode, which can greatly improve the color level and contrast display effect of the image.

Spherical cholesteric liquid crystal shells may be produced by mixing boron nitride nanotubes (BNNTs) with cellulose nanocrystals (CNCs) in water. The BNNTs may be coated with a polysaccharide (e.g., pectin). The polysaccharide may function as a dispersing agent and an emulsion stabilizer. Associated compositions, methods, films, and articles employ the shells. The shells may form spherical droplets with isotropic cores.

The application discloses a kind of cholesteric liquid crystal display anti-interference method and system, method includes: S1, by the pressure sensor array integrated in cholesteric liquid crystal display module, obtains the pressure distribution data of cholesteric liquid crystal display module panel surface;S2, based on the pressure distribution data identification pressure exceeds preset threshold interference area, extract the pressure characteristic data of interference area;S3, input pressure characteristic data to the mapping model of preset pressure and optical distortion, mapping model is based on the data pairing set of internal pressure distribution and optical distortion, output the optical state offset of interference area affected pixel;S4, according to optical state offset, generate compensation signal for carrying out display compensation to interference area;S5, synthesis original image drive signal and compensation signal, and display is driven cholesteric liquid crystal display module by synthesis signal.This application adopts active compensation mode, solves the display distortion problem caused by external force.

The application discloses a circular polarizer and an OLED display device, the circular polarizer comprises a linear polarizing plate, a phase compensation film and a cholesteric liquid crystal film structure which are stacked, the linear polarizing plate is used for absorbing light whose vibration direction is perpendicular to the transmission axis and for transmitting light whose vibration direction is parallel to the transmission axis in ambient light and converting the light into linearly polarized light, the phase compensation film is used for converting the linearly polarized light into circularly polarized light; the cholesteric liquid crystal film structure is used for reflecting ultraviolet light and infrared light in ambient light, the cholesteric liquid crystal film structure is composed of one layer of left-handed cholesteric liquid crystal film and one layer of right-handed cholesteric liquid crystal film, or is composed of two layers of left-handed cholesteric liquid crystal film with a half-wave plate in between, or is composed of two layers of right-handed cholesteric liquid crystal film with a half-wave plate in between. The application can effectively shield ultraviolet light and infrared light in ambient light, thereby improving the operation efficiency and service life of the OLED display device.

Provided are a cholesteric liquid crystal film including a cholesteric liquid crystal, in which the cholesteric liquid crystal film has a stripe pattern in which dark portions and bright portions are alternately arranged in a straight line on an upper surface observed with a microscope; and a manufacturing method thereof.

This invention belongs to the field of photonics, functional optical materials and devices, specifically relating to a spectral dynamic programming device, its fabrication method, and its applications. The spectral dynamic programming device has a three-layer structure, comprising, from bottom to top, a light-emitting thin film, a cholesteric liquid crystal layer, and a circular polarization analyzer. The light-emitting thin film is a fluorescent thin film or an organic room-temperature phosphorescent polymer thin film; the cholesteric liquid crystal layer is a mixture of a photoresponsive chiral molecular switch, a static inverse chiral dopant, and a nematic liquid crystal host. By alternately irradiating the liquid crystal layer with light of different wavelengths, the helical pitch of the liquid crystal layer can be reversibly and continuously adjusted, allowing its photonic bandgap reflection band to sweep across a wide spectral range. This dynamically "tailors" the emission spectrum of the lower light-emitting thin film, achieving continuous and reversible programming of the output color. This device can also generate emission with a high circular polarization asymmetry factor and possesses excellent cycling stability, making it applicable to the optical field.

The present application provides a kind of reflecting film, windshield and head-up display system, the reflecting film has high visible light transmittance and can improve the brightness of display image, the transparency of appearance tone is good.The reflecting film has selective reflection layer, the selective reflection layer has the cholesteric liquid crystal layer formed by fixed cholesteric liquid crystal phase, in each range of the range of wavelength 400nm above and less than 500nm and the range of wavelength 500nm above and less than 600nm, the maximum value of natural light reflectance is 10%~25%, the difference between the maximum maximum value and the minimum minimum value is 3% or more, the added value of wavelength band of the region higher than the average of maximum value and minimum value is 20nm~80nm, in the range of wavelength 600nm above and 800nm below, the maximum value of natural light reflectance is 10%~25%, the added value of wavelength band of the region higher than the average of maximum value and minimum value is 120nm or more.

The application belongs to the technical field of light emitting diodes, and discloses a high-polarization circularly polarized light emitting diode, a preparation method and application thereof. The circularly polarized light emitting diode comprises, from bottom to top, a bottom reflective electrode arranged on the surface of a first substrate, a light emitting unit, a top transparent electrode, and a Bragg reflection layer. The material for preparing the Bragg reflection layer is cholesteric liquid crystal. The bottom reflective electrode and the Bragg reflection layer form a Bragg-mirror reflection microcavity structure, and the Bragg reflection layer selectively reflects and outputs circularly polarized light with the same chirality. The Bragg-mirror reflection microcavity is used for chirality selection, and the microcavity structure reverses the optical rotation of light with non-target optical rotation, thereby breaking through the problem of serious light loss of a traditional external polarizer. The microcavity structure utilizes the Bragg-mirror reflection optical microcavity polarization regulation mechanism, so that the light emitting diode does not depend on the intrinsic chirality, spin polarization or special orientation of the light emitting material, and can be applied to various light emitting systems.

This disclosure provides an electronic device, characterized in that it includes: a reflective panel having a first side and a second side opposite to each other; a transmittance switching element disposed on the first side of the reflective panel; and a light absorption element disposed on the second side of the reflective panel; wherein the reflective panel includes at least one cholesteric liquid crystal layer, and the at least one cholesteric liquid crystal layer is used to reflect visible light in a reflective state.

An electronic device includes a reflective panel, a transmittance switching element and a light absorbing element. The reflective panel has a first side and a second side opposite to each other. The transmittance switching element is disposed on the first side of the reflective panel. The light absorbing element is disposed on the second side of the reflective panel. The reflective panel includes at least one cholesteric liquid crystal layer, and the at least one cholesteric liquid crystal layer is used to reflect visible light in a reflective state.

The present application discloses a kind of cholesteric liquid crystal compositions, the liquid crystal composition contains one or more compounds shown in formula I, one or more compounds shown in formula II, one or more compounds shown in formula III, one or more compounds shown in formula IV and one or more chiral active substances.The liquid crystal composition of the present application has large optical anisotropy (Δn≥0.22), large dielectric anisotropy, super wide operating temperature range (-30~95℃), good reliability, especially high contrast (contrast >25), small wavelength change at different temperatures (△λ≤20nm), and the liquid crystal composition can improve the jitter of liquid crystal display, and can have excellent anti-shock performance in vehicle environment, especially good anti-vibration performance at -30℃ and 90℃.It can be widely used in liquid crystal electronic book, outdoor and vehicle display and other optical devices.

The utility model discloses a kind of colour cholesteric liquid crystal display devices, including blue display module, green display module and red display module from top to bottom are sequentially arranged, and the side of red display module away from green display module is equipped with light-absorbing layer, by increasing photoexcitation material or photoluminescent layer in display device, red, green light is generated by using the part of blue light that is not reflected, to make up the problem of insufficient red, green reflectivity of lower layer of three-layer colour cholesteric liquid crystal display structure, improve overall reflectivity, while solve the problem of white picture blue when displaying.

The present application relates to the field of liquid crystal display, particularly relates to a cholesteric liquid crystal display device and its production method and control method, including oppositely arranged first substrate, second substrate and liquid crystal composite layer between the first substrate and the second substrate;The liquid crystal composite layer includes parent liquid crystal and a plurality of liquid crystal microcapsules dispersed in the parent liquid crystal, the inside of each liquid crystal microcapsule is encapsulated with single pitch cholesteric liquid crystal;The pitch of the cholesteric liquid crystal in the inside of different kinds of liquid crystal microcapsules is different;The capsule wall of the liquid crystal microcapsule is a light-transmitting insulating layer;The threshold voltage of the parent liquid crystal is less than the threshold voltage of the cholesteric liquid crystal in any kind of liquid crystal microcapsule.The present application widens the reflection band of cholesteric liquid crystal display device, improves the dynamic tuning range, reduces light loss, improves the display brightness and contrast of the device, improves the mechanical stability and temperature stability of the device, and has good process compatibility.

The invention relates to a color cholesteric liquid crystal color-changing device and a manufacturing method thereof. The color cholesteric liquid crystal color-changing device comprises a first conductive substrate, a first light orientation layer, a cholesteric liquid crystal layer, a second light orientation layer and a second conductive substrate which are sequentially arranged in a stacked mode. The cholesteric liquid crystal layer comprises a plurality of liquid crystal polymer units arranged according to a preset rule; and the liquid crystal polymer unit comprises a plurality of liquid crystal polymers with different colors. According to the color cholesteric liquid crystal color-changing device, the cholesteric liquid crystal layer can be formed through an ink-jet printing method, a retaining wall is not needed, the technological process is simple, pigments are not prone to color mixing after exposure and curing, the stability is high, and therefore the manufacturing process is simplified, and stable display is achieved.