483 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 relates to the technical field of cholesteric liquid crystal electronic paper display, and discloses a cholesteric liquid crystal electronic paper display panel and a driving method thereof, and the cholesteric liquid crystal electronic paper display panel comprises an upper substrate, a lower substrate, a grid scanning line and a signal line, the electrode strip blocks continuously extend in the direction of a grid scanning line, each electrode strip block corresponds to one row of pixels, a single pixel corresponds to one pixel electrode, the electrode strip block corresponding to each row of pixels is conducted with the ITO electrode in the corresponding row through a conductive spacer, the ITO electrode is located on the periphery of a display area of the display panel, and in the direction of a signal line, the ITO electrode is connected with the electrode strip block in the corresponding row. The size of a single pixel is larger than the width L of each electrode strip block and larger than or equal to the width L'of a pixel electrode, and the distance S between every two adjacent electrode strip blocks is larger than or equal to the width W of a grid scanning line. According to the display panel and the driving method thereof, by optimizing the common electrode structure and the driving time sequence, the display performance and the refreshing efficiency of cholesteric liquid crystal electronic paper are remarkably improved.

The present disclosure provides a method for driving a cholesteric liquid crystal display device. The method includes the following steps: utilizing a driving circuit section to sequentially activate each scanning electrode within a display panel; utilizing the driving circuit section to apply first alternating-current (AC) voltage pulses to pixel circuits on an activated scanning electrode during a first stage within a pulse-width modulation (PWM) scanning procedure of an activated scanning electrode; and utilizing the driving circuit section to apply second AC voltage pulses to the pixel circuits on the activated scanning electrode during a second stage of the PWM scanning procedure. A first voltage amplitude and a first period of the first AC voltage pulses are different from a second voltage amplitude and a second period of the second AC voltage pulses, respectively.

The present invention provides a composite pigment, which comprises a first cholesteric liquid crystal pigment and a second cholesteric liquid crystal pigment. The above-mentioned first cholesteric liquid crystal pigment is a pigment having a center wavelength of a selective reflection band in the range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The above-mentioned second cholesteric liquid crystal pigment is a pigment having a selective reflection bandwidth of 200 nm or more in the range of 400 nm or more and 800 nm or less. At least a part of the selective reflection band of the above-mentioned first cholesteric liquid crystal pigment overlaps with the selective reflection band of the above-mentioned second cholesteric liquid crystal pigment. With respect to the total amount of the above-mentioned first cholesteric liquid crystal pigment and the above-mentioned second cholesteric liquid crystal pigment, the content of the above-mentioned first cholesteric liquid crystal pigment is more than 0% by weight and 30% by weight or less.

The invention discloses a single-layer liquid crystal reflection type liquid crystal color display module and a preparation method thereof. The display module comprises a light absorption layer, a lower substrate, a red-green-blue three-primary-color reflection type cholesteric liquid crystal layer and an upper substrate which are sequentially arranged. The lower substrate is provided with a TFT electrode, the upper substrate is provided with a conductive indium tin oxide layer, the face, containing the TFT electrode, of the lower substrate is arranged upwards, the red-green-blue three-primary-color reflective cholesteric liquid crystal layer comprises a plurality of polyimide separating walls, and a micron-sized thin-wall container is formed between every two adjacent polyimide separating walls. And three adjacent micron-sized thin-wall containers form a group of pixel strips. Through formula improvement and process upgrading, the reflectivity of the display module is remarkably enhanced, color reflection is brighter, the visual angle characteristic of a display device is improved, the sensitivity to the observation angle is reduced, the display brightness and the light utilization rate are improved, and systematic optimization of reflection efficiency is 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.

Provided are a chiral photosensitive molecular switch, a cholesteric liquid crystal composition, and a display panel and a preparation method therefor. The chiral photosensitive molecular switch has two stable states, and can be transformed from one stable state to the other stable state in response to light, and exist stably. The cholesteric liquid crystal composition comprises: the chiral photosensitive molecular switch, a bent-core molecule mixture, a rod-shaped single crystal mixture and a non-photosensitive chiral dopant; the cholesteric liquid crystal composition can be used to prepare a cholesteric liquid crystal display panel, the cholesteric liquid crystal comprising two stable states having different rotation directions, and being able to reflect light having different rotation directions. By adopting the strategy of light regulating the rotation direction of a cholesteric liquid crystal and an electric field regulating a reflection band, it is possible to obtain a cholesteric liquid crystal display panel having high reflectivity, high contrast and good stability, and which can be applied to electric field regulation of reflection in the full spectrum range.

The utility model discloses a reflective display panel and a display device. The reflective display panel comprises a backlight module, a first liquid crystal box, a second liquid crystal box and a third liquid crystal box, wherein the first liquid crystal box, the second liquid crystal box and the third liquid crystal box are sequentially stacked on the backlight module; the first liquid crystal box comprises a first array substrate, a first opposite substrate and a first cholesteric liquid crystal layer; the first cholesteric liquid crystal layer is used for reflecting light of a first color in a reflection state; the second liquid crystal box comprises a second array substrate, a second opposite substrate and a second cholesteric liquid crystal layer; the second cholesteric liquid crystal layer is used for reflecting light of a second color in a reflection state; the third liquid crystal box comprises a third array substrate, a third opposite substrate and a third cholesteric liquid crystal layer; the third cholesteric liquid crystal layer is used for reflecting light of a third color in a reflection state; the backlight module emits backlight from the backlight surface of the first liquid crystal box to the first liquid crystal box. The reflective display panel not only can display when ambient light is dark, but also does not have the problem of depth of field.

The invention provides an intelligent wearable high-sensitivity visual mechanical sensor and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing a liquid crystal monomer, a chiral agent, a cross-linking agent, a chain extender, a photoinitiator and a catalyst, and carrying out prepolymerization reaction to obtain a first solution; then coating the first solution on the film-shaped PU adhesive to enable the cholesteric liquid crystal to complete evaporation-induced self-assembly, and then irradiating and curing under an ultraviolet lamp to obtain a color-changing film; and finally hot-pressing the color-changing film on the fabric to obtain the intelligent wearable high-sensitivity visual mechanical sensor. The color-changing film and the textile are combined through the PU adhesive, amino in the PU adhesive reacts with carbon-carbon double bonds in the color-changing layer by controlling the chemical composition of the color-changing layer, the color-changing layer and the PU adhesive are combined more firmly, the PU adhesive can permeate into the textile in the hot pressing process, and the color-changing effect is improved. The color-changing layer, the middle layer and the textile are tightly combined, and the wearable force response visual sensor better fitting the three-dimensional curved surface of the human body is prepared.

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 conductive structural color hydrogel for MI monitoring and treatment as well as a preparation method and application of the conductive structural color hydrogel. Comprising a conductive nano-material, and the conductive nano-material has a catechol group; an HPC cholesteric liquid crystal; a matrix material; a cross-linking agent; the conductive structural color hydrogel is formed through physical and / or chemical interaction among the conductive nano material, the HPC cholesteric liquid crystal, the matrix material and the cross-linking agent. The conductive structural color hydrogel has enhanced electromechanical response and force-induced discoloration response characteristics, has a photoelectric double-signal sensing function, can accurately and visually monitor mechanical stimulation in real time, can be used as a flexible sensing material, is used for preparing products capable of realizing visual feedback and digital feedback of mechanical stimulation, and has wide application prospects. And the hydrogel can be used for preparing a product for compensating and / or repairing electrical conduction of biological tissues, especially can be used for preparing a conductive structural color hydrogel patch for monitoring and / or treating myocardial infarction (MI), and has a wide application prospect.

The invention discloses a liquid crystal structural color holographic film, a preparation method thereof and a color holographic device. The liquid crystal structural color holographic film comprises a nematic phase liquid crystal layer and a cholesteric phase liquid crystal layer which are arranged in a stacked mode, the total thickness of the nematic phase liquid crystal layer and the cholesteric phase liquid crystal layer is fixed, and a completely polymerized liquid crystal polymer network is formed. The cholesteric liquid crystal layer comprises a plurality of structural color areas, and in the different structural color areas, the spiral structure of the cholesteric liquid crystal layer has different screw pitches so as to reflect light of different colors; the cholesteric liquid crystal layer is provided with a patterned surface orientation structure, the surface orientation structure is obtained through optimization according to a color holographic algorithm, and the orientation structures of different structural color areas independently encode phase holograms of different wavelength channels. The liquid crystal structural color holographic film provided by the invention can display a structural color pattern in a near field and an independent color holographic image in a far field, so that light regulation and control of near-far field and wavelength combined multiplexing are realized, and the multiplexing dimension and functionality of a flexible optical element are improved.

The invention discloses a cholesteric phase LCD multi-gray-scale display method and system, and the method comprises the steps: decomposing each physical pixel in a cholesteric phase LCD into a plurality of sub-pixels which can be addressed independently, and distributing x gray-scale voltages to each sub-pixel, where x is greater than or equal to 1; controlling all sub-pixels in the cholesteric LCD to enter a P state; obtaining RGB pixel data corresponding to the to-be-displayed image and a target gray scale level n, and mapping the RGB pixel data to the corresponding target gray scale level n according to a pre-stored gray scale division strategy to obtain gray scale data corresponding to the RGB pixel data; and generating a control signal of the cholesteric LCD based on the gray-scale data to control the gray-scale state of each sub-pixel, acquiring a field synchronization signal, and generating a PWM signal according to the field synchronization signal to control a power circuit in the cholesteric LCD to output a gray-scale voltage matched with the gray-scale data so as to realize multi-gray-scale display of the cholesteric LCD. According to the method and the system, the gray scale level is remarkably improved under the condition of limited driving voltage.

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 microfluidic contact lens and a tear collection and analysis method, and belongs to the technical field of biomedical detection. The micro-fluidic contact lens comprises an outer layer and an inner layer, a micro-channel and a plurality of micro-cavities are arranged on the side, facing the inner layer, of the outer layer, inlets of the micro-cavities are sequentially connected to the side wall of the micro-channel, and the inlets of the micro-cavities form first capillary rupture valves through divergence angle design; a second capillary rupture valve is arranged on the micro-channel between every two adjacent micro-cavities, and a third capillary rupture valve is arranged on the micro-channel between each micro-cavity and the exhaust port of the micro-cavity; the inner layer is a smooth bent film; a paper microfluid sensor, a colorimetric sensor and a temperature-sensitive cholesteric liquid crystal (TSLC) sensor which are used for detecting tear indexes are arranged in the microcavity. The contact lens has good accuracy and stability in the aspects of measuring the secretion amount, the pH value and the temperature of tear, and particularly keeps relatively high reliability in comparison experiments under different illumination conditions.

The invention provides a dye liquid crystal dimming device which comprises a pair of transparent conductive base layers and a dye liquid crystal layer arranged between the transparent conductive base layers, and the dye liquid crystal layer is filled with at least one cholesteric liquid crystal composition, at least one elastic constant regulator and at least one dichroic dye; the dye liquid crystal layer has at least three states under an applied voltage, namely a transparent state in which incident light is transmitted to the greatest extent, a dark state in which the incident light is basically transmitted and absorbed, and a shielding state in which the incident light is basically absorbed and scattered, the dark state is still basically stable after the voltage is withdrawn, and the shielding state is still stable after the voltage is withdrawn. The transparent state and the shielding state need to be basically stable by continuously applying voltage; according to the liquid crystal dimming device, the elastic constant regulator is further added into the liquid crystal mixture, so that a dark-state non-uniform texture is eliminated, and meanwhile, the contrast ratio of the device is improved.

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.

The invention discloses a preparation method of a mechanochromic photonic crystal composite film as well as a product and application of the mechanochromic photonic crystal composite film. The TPU / CLCE composite film is prepared by compounding a mechanically force-induced color-changing cholesteric liquid crystal elastomer (CLCE) film onto a black polyurethane (TPU) film purchased on the market through a water transfer printing technology. The composite film prepared by a water transfer printing method has good tensile property, the shape and the color can be completely recovered, and the composite film has strong metal reflection color. The composite film meets the basic performance requirements of the color-changing car cover, can be further expanded to be applied to the fields of intelligent wearable equipment, consumer electronics and the like, and provides unique visual effects and functional characteristics for products. Good market application prospects are realized.

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 discloses a circular polarizer capable of improving luminous efficiency and a display device, and belongs to the technical field of display. The circular polarizer for improving the luminous efficiency comprises a cholesteric liquid crystal film, a first phase difference film, a second phase difference film, a third phase difference film and a linear polarizing film, the display device comprises a display substrate and the circular polarizer for improving the luminous efficiency. The cholesteric liquid crystal film is located between the display substrate and the first phase difference film, and the linear polarizing film is located on the side, away from the cholesteric liquid crystal film, of the third phase difference film. By adjusting the arrangement sequence of the liquid crystal polymer layers with different screw pitches in the cholesteric liquid crystal film in the thickness direction and adding the phase difference film, the problem that the cholesteric liquid crystal film in the circular polarizer is low in light emitting efficiency for light with large wavelength under a large visual angle is solved, the light emitting efficiency of the display device under the visual angle of 30-80 degrees is greatly improved, and the display effect is improved. And the display effect of the display device is enhanced.

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.

An optical laminate including an adhesive layer, a light interference layer, and two or more laminated reflective layers in this order, in which the laminated reflective layer includes one reflective layer A that includes one or more cholesteric liquid crystal layers consisting of a rod-like liquid crystal, and one reflective layer B that includes one or more cholesteric liquid crystal layers consisting of a disk-like liquid crystal, in a case where the reflective layers A face each other or the reflective layers B face each other in adjacent laminated reflective layers, reflection center wavelengths of the adjacent reflective layers are different from each other.

The invention discloses a circular polarizer based on visual angle compensation and a display device, and belongs to the technical field of display. The circular polarizer comprises a cholesteric liquid crystal layer, a phase difference layer, a linear polarization layer and a visual angle compensation layer, the display device comprises a display substrate and the circular polarizer. The cholesteric liquid crystal layer is located between the display substrate and the phase difference layer, the linear polarization layer is located on the side, away from the cholesteric liquid crystal layer, of the phase difference layer, the visual angle compensation layer is located between the cholesteric liquid crystal layer and the display substrate, and a cholesteric liquid crystal regulation and control light wave band at least comprises partial wavelengths ranging from 440 nm to 680 nm. The visual angle compensation layer is used for converting part of small visual angle (0-30 degrees) light emitted by the display substrate into large visual angle (31-80 degrees) emitting angle light, the problem that the cholesteric liquid crystal brightening efficiency is low under the large visual angle is solved, and the display effect of the display device is improved.

Provided is a display device including: an optical layer disposed on a display unit and including a cholesteric liquid crystal; and a cover glass disposed on the optical layer, in which the cover glass includes a flat portion and a curved portion disposed outside the flat portion, and the cholesteric liquid crystal overlaps the curved portion. According to the present invention, by forming an optical layer between a display unit and a cover glass, a viewing angle-based color change of a flat portion and a curved portion of the cover glass can be minimized.

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.

The present invention provides a composite pigment, which comprises a first cholesteric liquid crystal pigment and a second cholesteric liquid crystal pigment. The above-mentioned first cholesteric liquid crystal pigment is a pigment having a central wavelength of a selective reflection band in the range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The above-mentioned second cholesteric liquid crystal pigment is a pigment having a selective reflection bandwidth of 200 nm or more in the range of 400 nm or more and 800 nm or less. At least a part of the selective reflection band of the above-mentioned first cholesteric liquid crystal pigment overlaps with the selective reflection band of the above-mentioned second cholesteric liquid crystal pigment. With respect to the total amount of the above-mentioned first cholesteric liquid crystal pigment and the above-mentioned second cholesteric liquid crystal pigment, the content of the above-mentioned first cholesteric liquid crystal pigment is more than 30% by weight and 80% by weight or less.