615 results about "Cholesteric liquid crystal" patented technology

The invention discloses a reflective display device and a driving method, the reflective display device comprises a first liquid crystal box and a second liquid crystal box, and the reflective display device is provided with a first color pixel unit, a second color pixel unit and a third color pixel unit; a color film substrate of the first liquid crystal box is in a transparent state in an area corresponding to a first color pixel unit, and a second color resistance layer and a third color resistance layer corresponding to a third color pixel unit are arranged in an area corresponding to a second color pixel unit; one of first cholesteric liquid crystal molecules of the first liquid crystal box and second cholesteric liquid crystal molecules of the second liquid crystal box reflects first color light in a reflection state, and the other one reflects complementary color light of the first color light in the reflection state; and the filtering wavelength of the second color resistance layer and the filtering wavelength of the third color resistance layer are partially overlapped with the wavelength of the complementary color light. Therefore, the reflective display device can realize color display by adopting the double liquid crystal boxes.

A wearable device is provided. The wearable device includes a display panel which includes a plurality of light-emitting devices, a substrate on which the plurality of light-emitting devices is disposed, a pixel define layer (PDL) bank surrounding and partitioning each of the plurality of light-emitting devices to define a plurality of subpixel areas, and a cholesteric liquid crystal (CLC) film disposed on the substrate and configured to convert light output from the plurality of light-emitting devices into circularly polarized light, wherein each of the plurality of light-emitting devices include an organic film layer, an upper electrode disposed on the organic film layer and the PDL bank, and a lower electrode disposed under the organic film layer and the PDL bank, and wherein the PDL bank includes a first surface perpendicular to the substrate, surrounding a portion of an outer peripheral surface of each of the plurality of light-emitting devices, and a second surface facing the CLC film and parallel to the substrate.

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 invention provides a display screen suitable for cholesterol liquid crystal and a driving method. The display screen comprises a time schedule controller, a source driver, a grid driver and a common voltage generating circuit. The time schedule controller obtains image data and output setting, and outputs a source electrode control signal, a grid electrode control signal and a common voltage control signal; the source electrode driver outputs a source electrode driving signal according to the source electrode control signal, the source electrode driving signal comprises a multi-frame first alternating current signal and a multi-frame first direct current signal, and then output is paused until a next image is displayed; the gate driver outputs a gate driving signal according to the gate control signal; the common voltage generation circuit outputs a common voltage signal according to the common voltage control signal, and the common voltage signal comprises a multi-frame second AC signal and a multi-frame second DC signal; the second AC signal and the first AC signal are synchronous and opposite in polarity, and the second DC signal and the first DC signal are synchronous. The image display requirement can be met, and power consumption is reduced.

The invention discloses a high-cross-voltage cholesteric LCD display screen driving method and system supporting local refreshing. The method comprises the following steps: generating a frame frequency switching instruction according to pre-stored switching information of an Nth frame image and an (N + 1) th frame image; determining a non-refresh area and a refresh area according to the frame frequency switching instruction; generating a gate driving signal based on the non-refresh area and the refresh area, and generating a source driving signal and a common electrode signal according to the gate driving signal; and inputting the gate driving signal, the source driving signal and the common electrode signal to drive the LCD display screen. According to the high-cross-voltage cholesteric LCD display screen driving method and system supporting local refreshing, line-by-line high-cross-voltage charging of the pixel units is achieved, high-cross-voltage local refreshing is supported, and meanwhile the problem of unequal display widths is solved.

The invention relates to a reflective display panel and a preparation method thereof. The reflective display panel comprises a first substrate and a second substrate which are oppositely arranged, and a retaining wall structure, a cholesteric liquid crystal layer and an alignment packaging layer which are located between the first substrate and the second substrate; the retaining wall structure is arranged on the surface of the side, close to the second substrate, of the first substrate, the space between the first substrate and the second substrate is divided into a plurality of sub-pixel areas arranged on the same layer, and the retaining wall structure is arranged around the sub-pixel areas; the cholesteric liquid crystal layer is located in the sub-pixel area; the alignment packaging layer is at least located on the surface of the side, close to the cholesteric liquid crystal layer, of the second substrate. The alignment packaging layer comprises a plurality of first alignment packaging units arranged in one-to-one correspondence with the sub-pixel areas, and the first alignment packaging units are at least located in the sub-pixel areas and connected with the adjacent retaining wall structures. By means of the alignment packaging layer, the cholesteric liquid crystal layer can be packaged to prevent cross color, and alignment can be conducted on the cholesteric liquid crystal layer to improve the display effect.

A method for driving a cholesteric liquid crystal display, wherein the method includes steps as follows: Firstly, a reflective cholesteric liquid crystal panel including a pixel array composed of a plurality of pixel units is provided. Next, a scanning operation is performed on the pixel array. The scanning operation includes steps as follows: A continuous fixed pulse is applied to at least one of the plurality of pixel units lasting for a time period, so as to make a cholesterol liquid crystal layer of the at least one of the plurality of pixel units having a uniform lying helix (ULH) phase; and a maintaining pulse that is smaller than the continuous fixed pulse is applied to the at least one of the plurality of pixel units.

The invention provides a monitoring device for simultaneously monitoring multiple pollutants in a water environment based on an echo wall mode liquid crystal microcavity and a control method thereof, and belongs to the technical field of optical microsensing. Cholesteric liquid crystal solution doped with fluorescent dye DCM is injected into liquid to be detected through a conical capillary microtube to form a plurality of liquid microsphere cavities; the fluorescent dye DCM in the liquid crystal microspheres emits fluorescence under the excitation of 532 nm laser pulse, high-quality echo wall mode laser emission is generated under the limiting action of the microcavity, and a spectrograph is used for recording a laser spectrum; when the concentration of pollutants in a water environment slightly changes, the change of the refractive index of the liquid crystal causes the change of the wavelength of the laser, so that the spectrum drifts, and high-sensitivity sensing is realized; the invention designs a real-time, quantitative and visual water environment pollutant detection sensor which has a wide application prospect in the field of water environment protection.

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 invention discloses a liquid crystal image recognizer, a preparation method thereof and an image recognition device. The liquid crystal image recognizer comprises a liquid crystal box and a reflecting mirror; the liquid crystal box comprises a first substrate and a second substrate which are oppositely arranged; the first rotation cholesteric liquid crystal layer and the second rotation cholesteric liquid crystal layer are located between the first substrate and the second substrate in a stacked mode; the first rotation cholesteric liquid crystal layer and the second rotation cholesteric liquid crystal layer are provided with a plurality of orientation structures which are distributed at equal intervals and are optimized by a deep learning algorithm; the reflector is located on the side, away from the second substrate, of the first substrate, and a preset distance is arranged between the reflector and the first substrate, so that a light beam turn-back framework is formed between the reflector and the liquid crystal box. The liquid crystal image recognizer provided by the invention can realize an independent image recognition function on circular polarization incident light with two kinds of chirality, and can also realize multifunctional image recognition of wavelength multiplexing through liquid crystal box cascading of devices, so that the functional diversity and multiplexing dimension of the all-optical image recognizer are improved.

The invention relates to the technical field of semiconductor photoelectronics and liquid crystal materials, in particular to a vortex light laser and a preparation method thereof. The supporting structure is arranged on the laser light source; the liquid crystal structure is arranged on the supporting structure, and the liquid crystal structure is configured to convert linearly polarized light from the laser light source into circularly polarized light and further convert the circularly polarized light into vortex light. In addition, the cholesteric liquid crystal in the liquid crystal structure can change the rotation direction of the circularly polarized light under the irradiation of the ultraviolet light source, so that the topological charge number of the vortex light can be regulated and controlled. Compared with a traditional vortex light laser, the vortex light laser has the advantages of being high in conversion efficiency, low in preparation cost, high in preparation speed, capable of tuning vortex light of orbital angular momentum, capable of conducting autonomous regulation and control on emergent light under the condition that an external electric field is not introduced, and capable of improving the utilization rate of the vortex light. The preparation process is compatible with the traditional semiconductor process, the size is small, and the integration level is high.

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 invention provides a cholesteric liquid crystal elastomer-based circular polarization room-temperature phosphorescence dynamic regulation and control method, which belongs to the technical field of optical materials, and comprises the following steps: 1, dissolving a liquid crystal monomer, a chiral agent, a cross-linking agent, a chain extender, a photoinitiator, a catalyst and a room-temperature phosphorescence polymer in a solvent dichloromethane to obtain a liquid crystal polymer solution; evaporating the solvent to obtain a red cholesteric liquid crystal elastomer room-temperature phosphorescent oligomer; 2, carrying out ultraviolet light polymerization on the cholesteric liquid crystal elastomer room temperature phosphorescent oligomer at room temperature to obtain a CLCE-RTP film; and step 3, regulating and controlling the circular polarization phosphorescence asymmetry factor by controlling the tensile deformation degree of the CLCE-RTP thin film. According to the invention, P1, P2 or P3 is doped with the cholesteric liquid crystal elastomer, so that the dynamic reversible regulation of the circular polarization room temperature phosphorescence asymmetry factor between 0.8 and 0.15 is realized.

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 discloses a circular polarization long afterglow material and a preparation method and application thereof.The circular polarization long afterglow material comprises a first film layer and a second film layer, the first film layer is a phosphorescent film, or the first film layer comprises a phosphorescent film and a fluorescent film, and the second film layer is a cholesteric liquid crystal polymer film. By utilizing radiation energy transfer and selective reflection property of the cholesteric liquid crystal polymer, the provided circular polarization long afterglow material has the dual characteristics of long service life and high glum value, and has good application value in the aspects of information encryption and anti-counterfeiting.

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.

Provided is an optical multi-pass imaging device including an aperture diaphragm (AD), and an optical element block including a front surface facing an object on which the AD is disposed and a back surface facing an image plane, the optical element block being optically coupled with the AD, wherein the optical element block includes at least one lens element, a wire grid polarizer (WGP), a quarter wave plate (QWP), and a cholesteric liquid crystal (ChLC) layer, wherein the WGP, the at least one lens element, the QWP, and the ChLC layer are disposed to provide a predetermined multi-transmission of radiation light from an object side to the image plane.

An object of the present invention is to provide a forming method capable of obtaining an optical film in which occurrence of ghost can be suppressed in a case of being used in, for example, a virtual reality display apparatus; an optical film; a cholesteric liquid crystal layer; an optical laminate; and a production method of a curved-shaped optically functional layer. The object is achieved by a forming method including a heating step of heating an optical film, a forming step of pressing the optical film against a mold to deform the optical film, and a cutting step of cutting the optical film, in which the heating step is a step of heating the optical film by irradiating the optical film with infrared rays, and an irradiation amount of the infrared rays has a distribution in a plane of the optical film.

The utility model belongs to the field of handwriting boards, and particularly relates to partially erasable bistable cholesteric liquid crystal writing equipment which comprises a handwriting board and a handwriting pen. The handwriting board comprises a first electric connection joint and a bendable bistable cholesteric liquid crystal display panel; the handwriting pen comprises a pen holder sleeve shell, an erasing driving structure, an erasing control key and a second electric connection joint, the pen holder sleeve shell is in a rod shape and is divided into an upper rod section and a lower rod section which are detachably connected and arranged up and down, and the erasing driving structure is arranged in the pen holder sleeve shell; the second electric connection joint and the first electric connection joint can be electrically connected with each other when the second electric connection joint and the first electric connection joint are in butt joint, and an erasing voltage is applied to the bistable cholesteric liquid crystal display panel; the erasing control key is used for controlling the erasing driving structure to apply global erasing voltage or local erasing voltage to the bistable cholesteric liquid crystal display panel. According to the utility model, the erasing circuit structure is removed from the handwriting board, so that the handwriting board presents a paper-like form and is thinner.

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.

An HMD employs a multifocal module having one or more voltage controlled optical elements. By changing the voltage applied to the one or more optical elements, the HMD can change the focal length of an image generated by the micro-display. The multifocal module can include a cholesteric liquid crystal (CLC) element and a polarizer switch. By controlling the voltage applied to each of the CLC element and the polarizer switch, the HMD can change the focal length of the image passed through the multifocal module. The HMD can thereby change the focal length of any image generated by the micro-display.

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.