Static speckle suppression device based on silver nanowire doped polymer stabilized liquid crystal

Abstract

The application discloses a static laser speckle inhibition device based on silver nanowire doped polymer stable liquid crystal, which comprises a silver nanowire doped polymer stable liquid crystal scattering sheet, a voltage control system matched with the silver nanowire doped polymer stable liquid crystal scattering sheet and an optical system. The silver nanowire doped polymer stable liquid crystal scattering sheet comprises a liquid crystal box and a liquid crystal polymer network doped with silver nanowires. The liquid crystal box comprises an electrode layer, an orientation layer and a spacing layer. The electrode layer is an indium tin oxide glass, one side of which is coated with an indium tin oxide film and serves as a conductive surface. The orientation layer is prepared by spin coating polyimide, and the polyimide is spin coated on the conductive surface of the indium tin oxide glass by using a spin coater, so that the orientation layer can be obtained after heating and drying. The spacing layer is prepared by using a polyethylene terephthalate (PET) film. Compared with other speckle inhibition systems, the application has the advantages of simple structure, high reliability and low cost.

Description

Technical Field

[0001] This invention relates to the field of laser display technology, and in particular to a speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal. Background Technology

[0002] Laser display is the fourth generation of display technology, following monochrome, color, and digital. Due to its high brightness, wide color gamut, and good directionality, the laser light source is currently the only high-quality display technology capable of meeting the BT.2020 standard. However, because the laser spectrum is very narrow and has high coherence, when the laser shines on a rough surface, the random undulations of the surface cause random fluctuations in the light phase, which appear on the screen as irregularly distributed granular spots, known as speckle. The presence of speckle obscures the information originally carried by the image, significantly reducing image display quality. Therefore, laser speckle suppression technology and devices are crucial for the quality and practical application of laser imaging and display.

[0003] Existing speckle suppression techniques mainly employ methods such as temporal decoherence and spatial decoherence. The most common method involves time-averaging of laser speckle using moving diffractive optical elements (Patent No. 201821767721.5, titled "Speckle Suppression Motion Device Based on Diffractive Optical Elements"). While this method offers high speckle suppression efficiency, it requires mechanical movement, resulting in a complex system structure, low stability, and poor reliability. Therefore, a highly efficient, purely static speckle suppression method and device are urgently needed.

[0004] To date, static speckle suppression techniques have primarily relied on electro-optic, magneto-optic, and acousto-optic modulation techniques. Liquid crystals, due to their excellent electro-optic properties, are ideal fillers for static scatterers and show promising application prospects in speckle suppression. However, current liquid crystal scatterers suffer from relatively small modulation depths, slow response speeds, and high driving voltages, resulting in less than ideal speckle suppression effects. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, such as insufficient speckle suppression effect, complex system structure, slow response time, poor stability, and large size, this invention provides a static laser speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal, which has a simple structure, fast response time, small size, and can be driven by low voltage.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A static laser speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal includes a silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, a voltage control system adapted to the liquid crystal scattering sheet, and an optical system.

[0008] The silver nanowire-doped polymer-stabilized liquid crystal scattering sheet includes a liquid crystal cell and a liquid crystal polymer network doped with silver nanowires.

[0009] The liquid crystal cell consists of an electrode layer, an alignment layer, and a spacer layer. The electrode layer is generally made of indium tin oxide glass, with the side coated with an indium tin oxide film being the conductive side. The function of the electrode layer is to enable electrical signals to act on the liquid crystal molecules, thereby achieving the light scattering function.

[0010] The alignment layer is prepared by spin coating of polyimide. Polyimide is spin-coated onto the conductive surface of indium tin oxide glass using a spin coater, and the alignment layer is obtained after heating and drying. The curing time and temperature of the alignment layer, as well as the thickness of the alignment layer, will affect its alignment ability. Good alignment ability means that the pretilt angle of the liquid crystal molecules is close to 90°.

[0011] Furthermore, the orientation layer is prepared by spin-coating polyimide, and the preparation steps are as follows:

[0012] Step 1: Adsorb the indium tin oxide glass onto the spin coater with the conductive side facing up. Use a pipette to take 200 μL of polyimide for spin coating. The spin coater speed is set in the range of 1500 to 2500 rpm, and the spin coating time is set in the range of 60 to 90 seconds. An optimized speed setting is 2000 rpm and an optimized time setting is 60 seconds.

[0013] Step 2: Place the spin-coated indium tin oxide glass on a hot plate for curing. First, heat the hot plate to 80°C for pre-baking for 300 seconds, and finally heat it to 200-220°C for curing for 50-70 minutes. The spin coating speed, curing time and temperature will affect the orientation ability of the alignment layer, thereby affecting the pretilt angle of the liquid crystal molecules. An optimized curing temperature is 210°C and an optimized curing time is 60 minutes.

[0014] The spacer layer is generally made of polyethylene terephthalate (PET) film with a thickness of 8–12 μm, with 8 μm being a preferred option. The thickness of the spacer layer affects the threshold voltage and saturation voltage of the polymer-stabilized liquid crystal, thus influencing the photoelectric properties and speckle suppression efficiency of the polymer-stabilized liquid crystal scattering sheet.

[0015] Furthermore, the liquid crystal polymer network doped with silver nanowires is mainly formed by curing a mixture of polymer and liquid crystal with silver nanowires under ultraviolet light.

[0016] The polymer-liquid crystal mixture is prepared by mixing liquid crystal molecules, polymer monomers, and a photoinitiator. The polymer monomers undergo polymerization after being acted upon by the photoinitiator, forming a cross-linked polymer network. The liquid crystal molecules can be, but are not limited to, negative liquid crystals such as HNG30400-200; the polymer monomers can be, but are not limited to, 1,4-bis-[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene (RM82); and the photoinitiator can be, but is not limited to, benzoin isopropyl ether (Irg651). Using different types of polymer monomers or different concentrations of the same type of polymer monomer will affect the polymer liquid crystal network structure, thereby affecting the photoelectric properties and speckle suppression efficiency of the polymer-stabilized liquid crystal scattering sheet.

[0017] Furthermore, the preparation steps of the liquid crystal polymer network doped with silver nanowires are as follows:

[0018] Step 1: Weigh the negative liquid crystal, polymer monomer and photoinitiator using an electronic balance and mix them evenly to obtain a polymer-liquid crystal mixture. A preferred mixture formulation is 97 parts by mass of negative liquid crystal, 3 parts by mass of polymer monomer and 0.02 parts by mass of photoinitiator, mixed evenly to obtain a polymer-liquid crystal mixture.

[0019] Step 2: Use an ultrasonic oscillator to disperse the silver nanowires in the silver nanowire dispersion for 50 to 70 minutes, with a preferred oscillating time of 60 minutes.

[0020] Step 3: Place the silver nanowire dispersion into the polymer and liquid crystal mixture to obtain a polymer and liquid crystal mixture doped with silver nanowires, and mix it with a mixer. A preferred mixing formula and parameters are as follows: Place the silver nanowire dispersion containing 0.01 parts by mass of silver nanowires into the polymer and liquid crystal mixture to obtain a polymer and liquid crystal mixture doped with silver nanowires, and mix it with a mixer for 60 minutes at a mixing temperature of 60°C.

[0021] Step 4: Heat the prepared polymer and liquid crystal mixture of silver-doped nanowires to make the liquid crystal in an isotropic state, and fill the polymer and liquid crystal mixture of silver-doped nanowires into the liquid crystal cell through capillary action. A preferred heating temperature is 60°C. After filling, continue to keep warm on the hot stage to make the liquid crystal molecules have good orientation. A preferred holding time is 60°C and a preferred holding time is 20 minutes.

[0022] Step 5: Use 5mW / cm 2 The liquid crystal cell filled with the polymer and liquid crystal mixture of silver nanowires is irradiated with ultraviolet light for 5 to 10 minutes to induce polymerization and form a liquid crystal polymer network of silver nanowires. A preferred ultraviolet curing time is 7 minutes.

[0023] The silver nanowires are the dopant material in the polymer-stabilized liquid crystal scattering sheet. Silver nanowire doping can effectively eliminate ionic impurities in the liquid crystal, thereby reducing the conductivity of the liquid crystal polymer network and consequently reducing the threshold voltage and saturation voltage of the polymer-stabilized liquid crystal scattering sheet. Furthermore, silver nanowire doping can increase the polar anchoring energy in the liquid crystal mixture, thereby enhancing the dielectric response of the liquid crystal molecules and reducing the response time of the polymer-stabilized liquid crystal scattering sheet. Moreover, the doping concentration of silver nanowires affects their gain effect on the polymer-stabilized liquid crystal scattering sheet. If the doping concentration of silver nanowires is too high, the silver nanowires will directly short-circuit, increasing the conductivity and reducing the actual electric field, thus increasing the driving voltage. Therefore, controlling the doping concentration of silver nanowires can effectively reduce the number of ionic impurities and the conductivity of the polymer-stabilized liquid crystal scattering sheet, giving it better electro-optic properties and speckle suppression efficiency. A preferred silver nanowire has a length of 30 μm, a diameter of 20 nm, and a doping mass fraction of 0.02%.

[0024] The voltage control system for the adapted liquid crystal scattering sheet includes a function generator, a voltage amplifier, and an oscilloscope. The function generator generates arbitrary waveform voltages, including but not limited to square waves, sine waves, and triangular waves. Different waveform voltages have different modulation effects on the polymer-stabilized liquid crystal, thus affecting its speckle suppression efficiency. The voltage amplifier amplifies the output voltage of the function generator proportionally and applies it across the polymer-stabilized liquid crystal scattering sheet, causing its operating voltage to exceed its saturation voltage, thereby increasing its modulation depth. The oscilloscope calibrates the voltage across the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, making the modulation voltage more accurate and visualizing the output voltage of the function generator.

[0025] The optical system described herein is used to achieve speckle suppression and laser imaging based on silver nanowire-doped polymer-stabilized liquid crystals. It includes a collimating optical path and an imaging optical path. The collimating optical path involves the laser beam emitted from the laser source being collimated and expanded by a collimating lens, and then incident on the polymer-stabilized liquid crystal scattering sheet after the aperture size is limited by an aperture stop. The imaging optical path involves an imaging lens imaging the laser beam passing through the polymer-stabilized liquid crystal scattering sheet onto a projection screen, where a digital camera receives and processes the image.

[0026] The technical concept of this invention is as follows: Because liquid crystals exhibit refractive index anisotropy and dielectric anisotropy, applying an external electric field can change the orientation of liquid crystal molecules, thereby altering their refractive index and dielectric properties. When no external electric field is applied, due to the vertical orientation of the alignment layer, the liquid crystal molecules align perpendicularly to the electrode layer, and the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet is in a transparent state. When an external electric field is applied, the liquid crystal molecules align parallel to the electrode layer under the influence of the applied field. However, the polymer network anchors the nearby liquid crystal molecules, causing them to maintain their original alignment. This results in different orientations of the liquid crystal molecules in the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, leading to a non-uniform refractive index, i.e., a scattering state. When the external electric field is removed, the liquid crystal molecules recover their initial orientation under the influence of the polymer network, causing the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet to return to a transparent state.

[0027] Furthermore, the speckle suppression effect is influenced by the polymer concentration in the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet. Generally, the higher the polymer concentration, the denser the polymer network formed, and the stronger the anchoring effect on the liquid crystal molecules. The stronger the anchoring strength, the greater the required driving voltage. Correspondingly, when the applied high voltage is removed, the liquid crystal molecules return to their initial state faster, the scattering degree of the liquid crystal is lower, and it also means lower decoherence.

[0028] Furthermore, the optimal modulation voltage is affected by the threshold voltage and saturation voltage of the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet. When the applied voltage exceeds the threshold voltage, most of the liquid crystal molecules begin to rotate along the direction of the electric field, resulting in a rapid increase in scattering efficiency. When the applied voltage exceeds the saturation voltage, the rotation angle of the liquid crystal molecules is limited by the polymer network, and the scattering efficiency tends to saturate.

[0029] Furthermore, when an AC voltage is applied across the ends of the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, it switches back and forth between the transparent and scattering states. As the voltage changes periodically, the rotation angle of the liquid crystal molecules also changes periodically. The speckle image is superimposed within the voltage period, and the random intensity fluctuations are averaged over time across the entire image, thereby achieving the effect of suppressing speckle.

[0030] Furthermore, by changing the AC voltage and the polymer concentration, the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet is dynamically modulated in a high scattering state, thereby achieving a better speckle suppression effect.

[0031] The beneficial effects of this invention are mainly reflected in:

[0032] 1) Using polymer-stabilized liquid crystal as the scattering sheet filling material reduces the driving voltage and increases the modulation depth of the liquid crystal molecules.

[0033] 2) Doping with silver nanowires improves the response time of polymer-stabilized liquid crystals and further reduces their driving voltage.

[0034] 3) The fabrication process of silver nanowire-doped polymer-stabilized liquid crystal scattering sheets is simple, the size is small, and the service life is long.

[0035] 4) Compared with other speckle suppression systems, it has a simple structure, high reliability, and low cost. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the device structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the liquid crystal scattering sheet of the present invention;

[0038] Figure 3 This is a schematic diagram illustrating the working principle of the device of the present invention;

[0039] In the figure, 1. Laser; 2. Collimating lens; 3. Aperture stop; 4. Silver nanowire-doped polymer-stabilized liquid crystal scattering sheet; 5. Imaging lens; 6. Projection screen; 7. CCD camera and its computer processing system; 8. Function generator; 9. Voltage amplifier; 10. Oscilloscope; 11. Electrode layer; 12. Orientation layer; 13. Spacer layer; 14. Liquid crystal polymer network doped with silver nanowires. Detailed Implementation

[0040] The present invention will now be further described with reference to the accompanying drawings.

[0041] Reference Figure 1 A static speckle suppression device and method based on silver nanowire-doped polymer-stabilized liquid crystal, comprising a silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, a voltage control system adapted to the liquid crystal scattering sheet, and an optical system.

[0042] The laser beam from the optical system is incident parallel to the polymer-stabilized liquid crystal scattering sheet 4 after passing through the collimating lens 2 and the aperture stop 3, and is scattered. The laser beam is decomposed into sub-beams at different angles. The sub-beams at different angles are focused by the focusing lens 5 and imaged onto the projection screen 6. Finally, the CCD camera and its computer processing system 7 perform speckle contrast analysis on the obtained image.

[0043] The voltage control system generates different waveform voltages using a function generator 8, which are amplified by a voltage amplifier 9 and applied to both ends of the polymer-stabilized liquid crystal scattering sheet 4. An oscilloscope 10 monitors the voltage and visualizes the voltage values. By changing the high and low voltages and waveforms, the average scattering degree and modulation depth of the polymer-stabilized liquid crystal scattering sheet are altered. The average scattering degree is defined as the average transmittance over one cycle, and the modulation depth is defined as the range of transmittance variation. Furthermore, the transmittance variation of the polymer-stabilized liquid crystal scattering sheet can be measured using, but is not limited to, a spectrometer and a photodetector, to reflect its average scattering degree and modulation depth. To ensure a flicker-free imaging pattern, the driving frequency of the applied voltage should be higher than the maximum perceptible frequency of the human eye.

[0044] Reference Figures 2-3 This describes the structure and working principle of the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet. The silver nanowire-doped polymer-stabilized liquid crystal scattering sheet mainly consists of an electrode layer 11, an alignment layer 12, a spacer layer 13, and a liquid crystal polymer network 14 doped with silver nanowires. The electrode layer is typically made of indium tin oxide glass, which applies electrical signals to the liquid crystal molecules, thereby achieving light scattering.

[0045] The orientation layer is prepared by spin-coating polyimide, and the preparation steps are as follows:

[0046] Step 1: Adsorb the indium tin oxide glass onto the spin coater with the conductive side facing up. Use a pipette to take 200 μL of polyimide for spin coating. Set the spin coater speed to 2000 rpm and the time to 60 seconds.

[0047] Step 2: Place the spin-coated indium tin oxide glass on a hot plate for curing. First, preheat it to 80°C for 300 seconds, and finally heat it to 210°C for 60 minutes. The spin coating speed, curing time and temperature will affect the orientation ability of the alignment layer, thus affecting the pretilt angle of the liquid crystal molecules.

[0048] The spacer layer is used to control the thickness of the polymer liquid crystal network. PET film with a thickness of 8μm is selected as the spacer layer.

[0049] The silver-doped nanowire liquid crystal polymer network is formed by curing a mixture of polymer and liquid crystal with silver nanowires under ultraviolet light. The preparation steps of the silver-doped nanowire liquid crystal polymer network are as follows:

[0050] Step 1: Weigh 97 parts by mass of negative liquid crystal, 3 parts by mass of polymer monomer and 0.02 parts by mass of photoinitiator using an electronic balance and mix them evenly to obtain a polymer-liquid crystal mixture.

[0051] Step 2: Use an ultrasonic oscillator to disperse the silver nanowires in the silver nanowire dispersion for 60 minutes.

[0052] Step 3: Take a silver nanowire dispersion containing 0.01 parts by mass of silver nanowires and place it in the polymer and liquid crystal mixture to obtain a polymer and liquid crystal mixture doped with silver nanowires. Mix it with a mixer for 60 minutes at a mixing temperature of 60°C.

[0053] Step 4: Heat the above-mentioned polymer and liquid crystal mixture with silver nanowires to 60°C to make the liquid crystal in an isotropic state. At this temperature, fill the liquid crystal cell with the polymer and liquid crystal mixture with silver nanowires through capillary action. After filling, continue to keep it at 60°C on a hot stage for 20 minutes to make the liquid crystal molecules have good orientation.

[0054] Step 5: Use 5mW / cm 2 Irradiation with ultraviolet light for 7 minutes on a liquid crystal cell filled with a polymer and liquid crystal mixture doped with silver nanowires induces polymerization to form a liquid crystal polymer network doped with silver nanowires.

[0055] In the polymer-stabilized liquid crystal scattering sheet, the speckle suppression function is achieved by a liquid crystal polymer network doped with silver nanowires. When no external electric field is applied, the liquid crystal molecules are aligned perpendicular to the electrode layer due to the vertical alignment of the alignment layer, and the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet is in a transparent state. When an external electric field is applied, the liquid crystal molecules will align parallel to the electrode layer under the action of the applied electric field, but the polymer network will anchor the liquid crystal molecules in the vicinity, so that these liquid crystals maintain their original alignment and orientation. This results in different orientations of liquid crystal molecules in the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, which leads to non-uniform refractive index, i.e., a scattering state. When the external electric field is removed, the liquid crystal molecules will restore their initial orientation under the action of the polymer network, so that the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet returns to a transparent state.

[0056] The speckle suppression effect is affected by the polymer concentration in the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet. Generally, the higher the polymer concentration, the denser the polymer network formed, and the stronger the anchoring effect on the liquid crystal molecules. The stronger the anchoring strength, the greater the required driving voltage. Correspondingly, when the applied high voltage is removed, the liquid crystal molecules return to their initial state faster, the scattering degree of the liquid crystal is lower, and it also means lower decoherence.

[0057] The optimal modulation voltage is affected by the threshold voltage and saturation voltage of the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet. When the applied voltage exceeds the threshold voltage, most liquid crystal molecules begin to rotate along the direction of the electric field, resulting in a rapid increase in scattering efficiency. When the applied voltage exceeds the saturation voltage, the rotation angle of the liquid crystal molecules is limited by the polymer network, and the scattering efficiency tends to saturate.

[0058] When an AC voltage is applied across the ends of a silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, it switches back and forth between a transparent state and a scattering state. As the voltage changes periodically, the rotation angle of the liquid crystal molecules also changes periodically. The speckle pattern is superimposed within the voltage period, and the random intensity fluctuations are averaged over time across the entire image, thereby achieving the effect of suppressing speckle.

[0059] By changing the AC voltage and the polymer concentration, the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet is dynamically modulated in a high scattering state, thereby achieving a better speckle suppression effect.

[0060] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. A static speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal, characterized in that, The system includes a silver nanowire-doped polymer-stabilized liquid crystal scattering sheet and a voltage control system and an optical system adapted to the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet. The silver nanowire-doped polymer-stabilized liquid crystal scattering sheet includes a liquid crystal cell and a liquid crystal polymer network of silver nanowires disposed within the liquid crystal cell. The liquid crystal cell includes an electrode layer, an alignment layer, and a spacer layer; the spacer layer is disposed between two adjacent alignment layers, and an electrode layer is respectively disposed on each of the two alignment layers. The electrode layer is indium tin oxide glass, wherein the side coated with the indium tin oxide film is the conductive side; the alignment layer is prepared by spin coating of polyimide; the spacer layer is made of polyethylene terephthalate (PET) film with a thickness of 8-12 μm. The orientation layer is prepared by spin-coating polyimide, and the preparation steps are as follows: Step 1: Place the indium tin oxide glass onto the spin coater with the conductive side facing up. Use a pipette to take 200 μL of polyimide for spin coating. Set the spin coater speed to 1500~2500 rpm and the spin coating time to 60~90 seconds. Step 2: Place the spin-coated indium tin oxide glass on a hot plate for curing. First, heat the hot plate to 80°C for pre-baking for 300 seconds, and finally heat it to 200~220°C for curing for 50~70 minutes. The spin coating speed, curing time and temperature will affect the orientation ability of the alignment layer, thus affecting the pretilt angle of the liquid crystal molecules. The liquid crystal polymer network doped with silver nanowires is formed by curing a mixture of polymer and liquid crystal and silver nanowires under ultraviolet light; the mixture of polymer and liquid crystal is prepared by mixing liquid crystal molecules, polymer monomers and photoinitiators, wherein the polymer monomers undergo polymerization after being acted upon by the photoinitiator to form a cross-linked polymer network. The preparation steps of the liquid crystal polymer network of the silver-doped nanowires are as follows: Step 1: Weigh the negative liquid crystal, polymer monomer and photoinitiator using an electronic balance and mix them evenly to obtain a polymer and liquid crystal mixture; Step 2: Use an ultrasonic oscillator to disperse the silver nanowires in the silver nanowire dispersion for 50-70 minutes; Step 3: Place the silver nanowire dispersion into the polymer and liquid crystal mixture to obtain the polymer and liquid crystal mixture doped with silver nanowires, and mix it evenly with a mixer. Step 4: Heat the prepared polymer and liquid crystal mixture of silver-doped nanowires to make the liquid crystal in an isotropic state, and fill the liquid crystal cell with the polymer and liquid crystal mixture of silver-doped nanowires through capillary action. Step 5: Use Irradiate the liquid crystal cell filled with a mixture of polymer and liquid crystal doped with silver nanowires with ultraviolet light for 5 to 10 minutes to induce polymerization and form a liquid crystal polymer network doped with silver nanowires.

2. The static speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal according to claim 1, characterized in that, The voltage control system includes a function generator, a voltage amplifier, and an oscilloscope. The function generator produces different waveform voltages, which are amplified by the voltage amplifier and applied across the polymer-stabilized liquid crystal scattering sheet. The oscilloscope monitors the voltage and visualizes the voltage values. The function generator generates arbitrary waveform voltages; different waveform voltages have different modulation effects on the polymer-stabilized liquid crystal, thus affecting its speckle suppression efficiency. The voltage amplifier proportionally amplifies the output voltage of the function generator and applies it across the polymer-stabilized liquid crystal scattering sheet, causing its operating voltage to exceed its saturation voltage, thereby increasing its modulation depth. The oscilloscope calibrates the voltage across the silver nanowire-doped polymer-stabilized liquid crystal scattering sheet, making the modulation voltage more accurate and visualizing the output voltage of the function generator.

3. The static speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal according to claim 1, characterized in that, The optical system is used to achieve speckle suppression and laser imaging. The optical system includes a collimating optical path and an imaging optical path. The collimating optical path is where the laser emitted from the laser is collimated and expanded by a collimating lens, and then the aperture is limited by an aperture stop before it enters the polymer-stabilized liquid crystal scattering sheet. The imaging optical path is where an imaging lens images the laser light passing through the polymer-stabilized liquid crystal scattering sheet onto a projection screen, and then a CCD camera and its computer processing system receive and process the image on the projection screen.

4. The static speckle suppression device based on silver nanowire-doped polymer-stabilized liquid crystal according to claim 1, characterized in that, The liquid crystal molecule is selected as a negative liquid crystal of model HNG30400-200; the polymer monomer is selected as 1,4-bis-[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene RM82; and the photoinitiator is selected as benzoin isopropyl ether Irg651.

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