292 results about "Cholesteric liquid crystal" patented technology

The invention discloses a cholesteric liquid crystal display driving method and a cholesteric liquid crystal display driving device for realizing dynamic video display, and belongs to the technical field of display. The method comprises the following steps: firstly, controlling a grid electrode and a source electrode driver to cooperatively work, and resetting a full-screen liquid crystal to a vertical arrangement state as a display reference; then applying a specific voltage signal to each pixel according to the current frame image data, so that the pixels are selectively kept in a vertical arrangement state or converted into a plane arrangement state to display a target image; then common electrode voltage polarity inversion is carried out, reverse voltage is applied for compensation, and finally the process is cycled to achieve image updating. The corresponding device comprises a display panel, a gate driver, a source driver and a time schedule controller for executing the method. According to the method and device, the refresh rate limitation of traditional cholesteric liquid crystal bistable switching is broken through, high-speed dynamic video display is achieved, meanwhile, the display reliability is effectively improved through polarity compensation, the service life is effectively prolonged through polarity compensation, and low power consumption and high compatibility are achieved.

The invention belongs to the technical field of liquid crystal display, and discloses a multi-gray-scale cholesteric liquid crystal display device and a driving method thereof, according to the multi-gray-scale cholesteric liquid crystal display device and the driving method thereof, cholesterol liquid crystal of a pixel unit is controlled to be in a P state, an FC state and an intermediate stable state between the P state and the FC state through driving voltage, and the liquid crystal display effect is improved. And gray scale display of the pixel unit is realized. The driving time sequence of the bistable cholesterol liquid crystal is optimized, the proper driving voltage is selected, the cholesterol liquid crystal is controlled to be in an intermediate stable state through the driving voltage, and the display state of the cholesterol liquid crystal between the full-transmission state and the full-reflection state is increased, so that the gray scale number of the cholesteric phase display device is greatly increased on the premise that the number of sub-pixels is not increased, and the display effect of the cholesteric phase display device is improved. The display effect is improved.

The invention discloses a cholesteric liquid crystal multi-gray-scale display method and a cholesteric liquid crystal display device, and relates to the technical field of display. In the multi-gray-scale display method, all the pixel units use the same driving voltage, and multi-gray-scale display is realized by adjusting the duration of the driving voltage instead of changing the voltage, so that when the multi-gray-scale display is realized, the requirement on voltage precision is reduced, and voltage debugging does not need to be performed on each pixel unit independently; the complexity of realizing multi-gray-scale display is reduced; moreover, the method is applied to the cholesteric liquid crystal display device, the cholesteric liquid crystal display device comprises a pixel driving unit and a pixel unit, and the pixel driving unit comprises a driving transistor and a capacitor; the capacitor is connected in parallel with the pixel unit. A capacitor exists in the pixel driving unit and can store voltage, so that the pixel unit can keep previous gray scale display even if voltage is stopped being applied to the driving transistor, and the gray scale display duration is prolonged.

The invention discloses a multi-gray-scale cholesterol liquid crystal display device and an array substrate thereof, a plurality of pixel units are arranged on a substrate body, each pixel unit comprises a plurality of sub-units, so that the different pixel units present the same or different gray scales, each sub-unit comprises a sub-pixel electrode and a TFT device connected with the sub-pixel electrode, and the TFT device is connected with the sub-pixel electrode. The areas of the sub-pixel electrodes of at least two sub-units are different, and the width-to-length ratios of the channel structures of the TFT devices of at least two sub-units are different. A single pixel unit is divided into a plurality of sub-pixels with different areas, different reflectivity can be achieved by controlling the areas or the sum of the areas of whether the sub-pixels are lightened or not, then the purpose of gray scale display is achieved, meanwhile, a suitable TFT device is configured for each sub-pixel, the sub-pixels with different areas are made to keep the same high charging rate, and the display effect is improved. And pixel opening compression is reduced as much as possible, so that the gray scale display effect is ensured.

The invention discloses a cholesteric liquid crystal display device and a driving method thereof, and belongs to the technical field of display, the cholesteric liquid crystal display device integrates a source electrode switching module and an external driving module on a first substrate, and the source electrode switching module and the external driving module are respectively connected among a driving chip data lead end, an external power supply and an internal data line. The driving method is executed by the time sequence control module and comprises the following steps: firstly, switching on the external driving module, and initializing a screen by using an external high-voltage signal; then switching to a conduction source electrode switching module, and writing an image by utilizing a low-voltage data signal of the driving chip in a time division multiplexing mode; finally, the two modules can be turned off at the same time to enable the pixels to float so as to maintain display. Safe switching of the driving source is achieved through structural innovation, the performance requirement for the driving chip is effectively lowered, current recharge is avoided, and the number of used chips is remarkably reduced.

The invention discloses a preparation method and application of a high-sensitivity temperature-responsive cellulose-based structural color material, and belongs to the field of functional polymer materials. The preparation method comprises the following steps: adding an isopropanol solvent into a certain volume of aqueous solution to obtain an isopropanol dilute solution; hydroxypropyl cellulose is dissolved in an isopropanol dilute solution, a cholesteric liquid crystal structure is formed through self-assembly, a bright structural color is presented, and the hydroxy propyl cellulose structural color material is prepared. A hydroxy propyl cellulose structural color material is uniformly coated on the surface of a polydimethylsiloxane film containing carbon nanotubes, then the transparent polydimethylsiloxane film is used for sealing the hydroxy propyl cellulose structural color material, the temperature sensor with the visual structural color is prepared, and the temperature sensor with the visual structural color is attached to the skin of the human body and can display different colors along with temperature changes. The prepared structural color material is sensitive in response to temperature stimulation, rapid in color change and suitable for human body visual real-time temperature monitoring in the field of intelligent sensing.

According to the active cholesterol liquid crystal display device and module, a data electrode layer and a scanning electrode layer respectively comprise M data electrode wires and N scanning electrode wires, and the projections of the M data electrode wires and the N scanning electrode wires are perpendicular to each other to form M * N projection intersection points. The TFT element layer includes M * N TFT elements, a source electrode of each TFT element being connected to the data electrode line, and a gate electrode of each TFT element being connected to the scanning electrode line. The common ground electrode layer comprises N common ground electrode wires. The cholesterol liquid crystal layer comprises M * N liquid crystal pixel areas, one end of each liquid crystal pixel area is connected with a common ground electrode wire, and the other end of each liquid crystal pixel area is connected with a drain electrode of the TFT element. The scanning driving IC applies scanning voltage Vscan to the scanning electrode lines, the data driving IC applies data voltage Vdata to the data electrode lines, the common-ground driving IC applies common-ground voltage Vcom to the common-ground electrode lines, when the scanning electrode lines corresponding to the liquid crystal pixel areas are switched on, the common-ground electrode lines and the data electrode lines are switched on at the same time, and the common-ground electrode lines and the data electrode lines are switched on at the same time. And the voltage polarity of the common ground voltage Vcom is opposite to the voltage polarity of the data voltage Vdata.

The invention provides a fullerene pyrrolidine enantiomer mediated cholesteric liquid crystal with circular polarization luminescence property and nonlinear anti-saturated absorption property, and a preparation method and application thereof. The method comprises the following steps: dissolving C60, paraformaldehyde and (R / S)-(+ / -)-alpha-methylbenzylamine in an organic solvent, and carrying out heating reflux reaction to obtain fullerene pyrrolidine enantiomer molecules; dissolving in carbon disulfide to obtain an enantiomer solution; dissolving achiral dye molecules in a solvent to obtain a dye solution; and dropwise adding the enantiomer solution and the dye solution into thermotropic liquid crystal molecules, and drying to obtain the thermotropic liquid crystal. The method is simple, the obtained cholesteric liquid crystal system shows a characteristic fingerprint texture and has a periodic spiral structure, and the doping proportion of chiral molecules is easy to adjust; the composite system has good time stability and is not prone to phase separation; the liquid crystal platform shows good circular polarization luminescence performance and third-order nonlinear optical property, and is a cholesteric liquid crystal platform with an integrated function.

The invention provides an optical module, a debugging method and optical equipment. The optical module comprises a display panel, a first cholesteric liquid crystal film, a first electric control dimming device and a second cholesteric liquid crystal film, the first cholesteric liquid crystal film is arranged on the light emitting side of the display panel, the second cholesteric liquid crystal film and the first cholesteric liquid crystal film have the same circular dichroism, and the second cholesteric liquid crystal film and the first cholesteric liquid crystal film are configured to reflect polarized light with the same rotation direction as the first cholesteric liquid crystal film and transmit polarized light with the rotation direction opposite to the first cholesteric liquid crystal film; the first electric control dimming device is configured to be time division multiplexing, can convert the transmitted polarized light into polarized light with opposite rotation directions in a power-off state, and maintains the polarization state of the transmitted polarized light in a power-on state. According to the optical module, when the polarized light is transmitted and reflected at the first cholesteric liquid crystal film and the second cholesteric liquid crystal film and is emitted from the first electric control dimming device in different polarization states, light loss cannot be generated, and the light emitting brightness and the imaging quality of the optical module can be guaranteed.

The invention belongs to the technical field of liquid crystal handwriting films, and provides a local erasing method, device, system, equipment and product of a liquid crystal handwriting film, the liquid crystal handwriting film comprises a first conductive layer, a cholesteric liquid crystal layer and a second conductive layer which are stacked in sequence, and the method comprises the following steps: responding to the detection that a writing pen moves on the liquid crystal handwriting film; obtaining a target area of to-be-erased handwriting on the cholesteric liquid crystal layer; controlling the first conductive layer and the second conductive layer to electrify the target area of the cholesteric liquid crystal layer; and after the writing pen leaves the liquid crystal handwriting film, delaying a preset time length, and stopping electrifying the target area of the cholesteric liquid crystal layer. Therefore, local handwriting residues caused by the fact that the target area of the cholesteric liquid crystal layer is powered off too early are avoided, and the handwriting erasing stability and reliability of the handwriting pen are remarkably improved.

Provided is a semiconductor chip that includes a solid-state imaging element and a cholesteric liquid crystal layer. The cholesteric liquid crystal layer is provided on a side from which light is incident with respect to the solid-state imaging element. The cholesteric liquid crystal layer is formed by cholesteric liquid crystal.

According to one embodiment, a liquid crystal element manufacturing method includes forming an alignment layer on a support body, forming a cholesteric liquid crystal layer on the alignment layer, forming an adhesive layer on the cholesteric liquid crystal layer, adhering a substrate having stretchability by the adhesive layer, and peeling the cholesteric liquid crystal layer from the alignment layer.

The carbon dioxide responsive liquid crystal film containing amidine compound is formed by a cholesteric liquid crystal polymer capable of reflecting visible light and an amidine compound, and the film is prepared from the amidine compound, cholesteric liquid crystal monomer, crosslinking agent, chiral dopant, photoinitiator and porogen, and the amidine group in the amidine compound reacts with carbon dioxide to increase the hydrophilicity of the polymer network, and when water penetrates into the film, the light reflected by the film is red-shifted and the color is changed accordingly. The carbon dioxide responsive liquid crystal film prepared by the application has stable color change effect, obvious response effect, is easier to distinguish, is still reversible after multiple cycles, and the performance of the film is maintained well after multiple cycles.

The application discloses an up-conversion circular polarization fluorescent device of perovskite quantum dots, which comprises, from bottom to top, a light-transmitting glass substrate, a parallel orientation layer, a reflection layer, a transparent separation layer and a composite nanomaterial layer; the reflection layer is a polymer cholesteric liquid crystal layer; the transparent separation layer is made of one of polymethyl methacrylate and polyvinyl alcohol; the composite nanocrystal material layer is composed of perovskite quantum dots / up-conversion nanocrystal composite nanomaterial; the perovskite quantum dots / up-conversion nanocrystal composite nanomaterial is prepared by an in-situ synthesis method. The device has the properties of circular polarization luminescence and up-conversion circular polarization luminescence, and has excellent performances such as high stability, high energy transfer efficiency, high radiation intensity and good repeatability.

The invention provides a method for preparing a large-area side-chain cholesteric liquid crystal elastomer thin film based on a blade coating method and application of the large-area side-chain cholesteric liquid crystal elastomer thin film. By controlling the content of sulfydryl functional groups in a system and accurately controlling key process parameters such as the blade coating rate and the blade coating temperature in the blade coating process, simple and controllable preparation of a one-pot method is achieved, and the prepared large-area side-chain cholesteric liquid crystal elastomer film has the force-induced discoloration and thermochromism dual response characteristics and is suitable for large-scale production. Wide application prospects are shown in the fields of color-changing materials, strain sensing, intelligent anti-counterfeiting, soft robots and the like, a new thought is provided for controllable preparation of high-performance intelligent response materials, and a new technical route is opened up for manufacturing of large-area customizable functional films.

The invention discloses a display panel, a preparation method and a display device, and relates to the technical field of display. The display panel comprises a first substrate and a second substrate which are oppositely arranged; the liquid crystal layer is arranged between the first substrate and the second substrate, the liquid crystal layer comprises a plurality of sub-pixels arranged in an array mode, each sub-pixel comprises at least one cholesteric liquid crystal unit reflecting light of the corresponding color, and each cholesteric liquid crystal unit comprises a single-color cholesteric liquid crystal and a capsule wall wrapping the single-color cholesteric liquid crystal. In every two adjacent sub-pixels, under the condition that the cholesteric liquid crystal unit belonging to one sub-pixel is adjacent to the cholesteric liquid crystal unit belonging to the other sub-pixel, the two cholesteric liquid crystal units are in contact with each other. According to the display panel, self-isolation of the single-color cholesteric liquid crystals can be achieved through the capsule wall, the flowability of the single-color cholesteric liquid crystals reflecting different colors is effectively restrained, and then the problems of cross color and pressure points caused by flowing of the single-color cholesteric liquid crystals are fundamentally solved.

A liquid crystal diffraction element includes a cholesteric liquid crystal layer having an alignment pattern in which an optical axis derived from a liquid crystal compound continuously rotates in-plane. A length of one rotation period of the alignment pattern is reduced to improve diffraction characteristics. The cholesteric liquid crystal layer includes a region at at least one surface in which the liquid crystal compound is tilted with respect to the surface, and includes a plurality of regions in which the tilt angle varies in-plane. An optical device including the liquid crystal diffraction element is also provided.

The invention discloses an independent chiral liquid crystal optical device based on dynamic frequency regulation and control and a preparation method of the independent chiral liquid crystal optical device. The independent chiral liquid crystal optical device comprises a conductive substrate, an alignment layer, a cholesteric liquid crystal layer with a stable polymer and an electrode, the precursor mixture is prepared from a nematic phase liquid crystal matrix, a chiral dopant, a polymerizable liquid crystal monomer and a photoinitiator; and the screw pitch of the cholesteric liquid crystal layer is dynamically regulated and controlled through the frequency of an alternating current electric field, so that the dynamic regulation of the selective reflection center wavelength is realized. The cholesteric liquid crystal is packaged between the two conductive substrates, the spiral structure and the photonic band gap characteristics of the cholesteric liquid crystal are accurately regulated and controlled through alternating current electric field frequency parameters, real-time dynamic modulation of the output light wavelength and the circular polarization state is achieved, the limitation of concentration curing of a traditional chiral agent is broken through, and the chiral liquid crystal is obtained. The dynamic reconfigurable control of output characteristics of circularly polarized light is realized, and the dynamic reconfigurable circularly polarized light engine is used as a universal circularly polarized light engine, has a plug-and-play characteristic, and can be directly integrated with various light emitting units.

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.

The present application relates to the technical field of cholesteric liquid crystal display, and particularly relates to a cholesteric liquid crystal display and a driving method thereof, which comprises a first substrate and a second substrate arranged oppositely; a cholesteric liquid crystal layer encapsulated between the first substrate and the second substrate, the reflection wavelength of the cholesteric liquid crystal layer varying with temperature within a working temperature range; a first switch electrode and a second switch electrode for applying an electric field to the cholesteric liquid crystal layer to control the cholesteric liquid crystal layer to switch between a planar state and a focal conic state; and a transparent heating electrode array comprising a plurality of heating units corresponding to a plurality of pixel regions respectively and capable of being controlled independently, the heating units being used for heating the corresponding pixel regions to change the pitch of the cholesteric liquid crystal in the pixel regions and thus change the reflection wavelength of the pixel regions. The present application decouples the brightness control and the color control of the pixel, so that a single-layer cholesteric liquid crystal structure can realize full-color display simultaneously.

The present application provides a liquid crystal display device, the liquid crystal display device comprises at least one display panel, the display panel comprises from top to bottom, first substrate, first conductive layer, first alignment layer, cholesteric liquid crystal composition layer, second alignment layer, second conductive layer and second substrate, wherein, the first alignment layer and the second alignment layer are perpendicular alignment, and the rubbing direction is up-down anti-parallel rubbing.The liquid crystal display device has narrower half-peak width under the condition of equivalent λmax, so that the reflected color is more bright and pure.

To provide a cholesteric liquid crystal display device.SOLUTION: A cholesteric liquid crystal display device comprises a first selective light reflection member 110, a second selective light reflection member 120, and a third selective light reflection member 130, which are sequentially stacked from bottom to top. Incident light enters the inside of the cholesteric liquid crystal display device from the third selective light reflection member 130. The first selective light reflection member, the second selective light reflection member, and the third selective light reflection member are arranged so as to reflect a color component of first light, a color component of second light, and a color component of third light, respectively. A first thin-film photovoltaic module 140 is disposed between the second selective light reflection member 120 and the third selective light reflection member 130, and the transmittance of the color component of the third light is lower than the transmittance of the other lights. A second thin-film photovoltaic module 150 is disposed between the first selective light reflection member 110 and the second selective light reflection member 120, and the transmittance of the color component of the second light is lower than the transmittance of the other lights.SELECTED DRAWING: Figure 1

The application discloses a light adjusting assembly and a display module. The light adjusting assembly comprises a first light adjusting layer, a second light adjusting layer, a liquid crystal polymer light adjusting layer and a control electrode layer. The first light adjusting layer comprises a first light transmission layer with a plurality of first light transmission parts and a second light transmission layer with a plurality of second light transmission parts. The second light adjusting layer comprises a plurality of first light adjusting parts and a plurality of second light adjusting parts, which are arranged alternately and closely along a first direction. The liquid crystal polymer light adjusting layer comprises a plurality of cholesteric liquid crystal polymer films which are spaced and correspond to the plurality of second light adjusting parts one by one. The control electrode layer comprises a plurality of control electrodes which are electrically connected to the plurality of cholesteric liquid crystal polymer films one by one. The cholesteric liquid crystal polymer film is configured to be switched between a light transmission state and a light reflection state. The first light adjusting part is configured to allow light incident thereinto to be emitted. The second light adjusting part is configured to cooperate with the cholesteric liquid crystal polymer film, so that the light incident thereinto can be emitted from the second light adjusting part or transmitted to the first light adjusting layer. Through the above arrangement, the problems of insufficient light utilization and low brightness are solved.

This invention discloses a circular polarizer with improved light extraction efficiency and a display device, belonging to the field of display technology. The circular polarizer with improved light extraction efficiency comprises a cholesteric liquid crystal film, a first retardation film, a second retardation film, a third retardation film, and a linear polarizing film; the display device comprises a display substrate and the circular polarizer with improved light extraction efficiency. The cholesteric liquid crystal film is located between the display substrate and the first retardation film, and the linear polarizing film is located on the side of the third retardation film away from the cholesteric liquid crystal film. This invention solves the problem of low light extraction efficiency of the cholesteric liquid crystal film for larger wavelengths of light at wide viewing angles by adjusting the arrangement order of liquid crystal polymer layers with different pitches in the cholesteric liquid crystal film in the thickness direction and adding a retardation film, significantly improving the light extraction efficiency of the display device at viewing angles of 30° to 80° and enhancing the display effect.

The application provides a display substrate and a display device. The display substrate comprises a first liquid crystal layer and an optical film layer. The first liquid crystal layer comprises cholesteric liquid crystal molecules, and the spiral direction of the cholesteric liquid crystal molecules is a first rotation direction. The optical film layer is located on the side of the first liquid crystal layer away from the display surface of the display substrate. The display substrate is configured to: in the case where no electric field is applied to the first liquid crystal layer, circularly polarized light of the first rotation direction in ambient light incident to the first liquid crystal layer is reflected by the first liquid crystal layer and emitted, circularly polarized light of a second rotation direction in the ambient light is incident to the optical film layer through the first liquid crystal layer and is converted into circularly polarized light of the second rotation direction incident to the first liquid crystal layer, and circularly polarized light of the second rotation direction incident to the first liquid crystal layer is emitted through the first liquid crystal layer; in the case where an electric field is applied to the first liquid crystal layer, ambient light incident to the first liquid crystal layer is incident to the optical film layer through the first liquid crystal layer and is absorbed by the optical film layer. The first rotation direction is opposite to the second rotation direction.

Provided are a reflective circular polarizer capable of suppressing a decrease in the contrast of a display image when used in a virtual reality display device or the like, a laminated optical film, and a virtual reality display device using the laminated optical film. This reflective circular polarizer includes a cholesteric liquid crystal layer and satisfies the relationship of formula (1).　Formula (1): I1+I2+I3+I4+I5 < 3.0 where I1 is a value obtained by doubling the transmittance of circularly polarized light in a turning direction opposite to circularly polarized light reflected by the reflective circular polarizer out of transmitted light when the reflected circularly polarized light is incident.　I2 is a value that is one-half of the reflectance of the circularly polarized light in the opposite turning direction out of reflected light reflected when the circularly polarized light reflected by the reflective circular polarizer is incident.　I3 is a value that is one-quarter of the reflectance of reflected light when the circularly polarized light in the opposite turning direction is incident on the reflective circular polarizer.　I4 represents the haze value of the reflective circular polarizer.　I5 represents the value of SCE / SCI×100 at a reflectance measured by an integrating sphere when unpolarized light is incident on the reflective circular polarizer.

A backlight module includes a circuit substrate, a plurality of light emitting elements, a first cholesteric liquid crystal layer, and a second cholesteric liquid crystal layer. The light emitting elements are disposed on the circuit substrate and electrically connected to the circuit substrate. The first cholesteric liquid crystal layer is disposed on the light emitting elements and overlaps a light emitting surface of each of the light emitting elements. The second cholesteric liquid crystal layer is disposed on the first cholesteric liquid crystal layer and overlaps the first cholesteric liquid crystal layer. The first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer have a first helical direction and a second helical direction, respectively. The backlight module provided by the present application has better light emitting uniformity but lower production cost. A display device using the backlight module is also provided. The backlight module and the display device provided by the present application have better light emitting uniformity and better display quality.

A cholesteric liquid crystal display device includes three multilayer structures, which are stacked on each other. Each of the multilayer structures includes a color substrate, a lower electrode layer, a pixel layer, an upper electrode layer and an upper substrate. The color substrate absorbs or filters a stray light from outside.