A laser display panel with self-healing function and its construction method and application

Abstract

The present invention discloses a laser display panel with a self-healing function and a method for constructing the same. The laser display panel comprises a periodically arranged RGB pixel array unit, which includes a self-healing polymer micro-template and random lasers. The self-healing polymer micro-template serves as a blank pixel, and the random lasers are uniformly filled within the blank template. The random lasers contain a gain medium and a scattering medium. The random laser micro-laser pixel array of the present invention has a periodic arrangement, facilitating mixed-color laser output and full-color laser display under specific excitation modes. Furthermore, the self-healing laser display panel of the present invention can self-repair even when scratched, maintaining its laser performance and maintaining a stable display effect.

Description

Technical Field

[0001] The present invention belongs to the field of laser display technology, and in particular relates to a laser display panel with a self-healing function, a construction method thereof, and an application thereof. Background Art

[0002] Flexible display panels hold great promise for applications in areas such as smart wearable devices, placing new demands on the mechanical properties of both the light source and the panel used in display technology. The high coherence of laser light sources enables them to exhibit advantages such as excellent monochromaticity, high brightness, and high contrast, along with superior color saturation and excellent color expression. This has led to widespread interest in laser-based display panels. Flexible laser display panels are subject to mechanical deformation during use, inevitably subject to damage from external forces such as twisting, tearing, and scratching, which can reduce device performance and lifespan. Therefore, laser display panels require self-healing capabilities to extend their lifespan. Integrating a red, green, and blue (RGB) microlaser array onto a self-healing substrate is the optimal approach for constructing self-healing display panels. The microlasers used in laser displays require a resonant cavity to provide a complete optical circuit. However, conventional resonant cavities are inherently rigid and require stringent construction conditions, making laser performance difficult to recover after damage. Therefore, constructing self-healing laser display panels has become a pressing technical challenge in this field. Summary of the Invention

[0003] In order to address the shortcomings of the existing technology, the present invention provides a laser display panel with self-healing function, wherein the laser display panel includes a periodically arranged RGB pixel array unit, the RGB pixel array unit includes a self-healing polymer micro-template and a random laser, and the random laser is filled inside the self-healing polymer micro-template.

[0004] According to an embodiment of the present invention, the self-healing polymer micro-template serves as a blank pixel, and the random lasers are uniformly filled inside the self-healing polymer micro-template.

[0005] Preferably, the pixel structure of the self-healing polymer micro-template can be any regular shape, such as a square.

[0006] Preferably, the side length of the self-healing polymer micro-template may be 10-100 μm, exemplified by 10 μm, 20 μm, 50 μm, 80 μm, and 100 μm.

[0007] According to an embodiment of the present invention, the random laser includes a gain medium and a scattering medium.

[0008] According to an embodiment of the present invention, the mass ratio of the gain medium to the scattering medium is 50:(1-10), exemplified by 50:2, 50:4, 50:6, 50:8, and 50:10.

[0009] The gain medium and scattering medium of the present invention can be the same material or different materials; the random laser realizes laser emission by realizing a closed-loop optical feedback circuit through multiple scattering under the joint action of the gain medium and the scattering medium.

[0010] According to an embodiment of the present invention, the self-healing polymer material in the self-healing polymer micro-template can be a polymer elastomer with polydimethylsiloxane as the main chain. For example, the self-healing polymer elastomer can be PDMS-MPU 0.4 -IU 0.6 , its molecular structure is shown below:

[0011]

[0012] According to an embodiment of the present invention, the self-healing polymer elastomer PDMS-MPU 0.4 -IU 0.6 The number average molecular weight (Mn) may be 5000-7000, exemplified by 5000, 6000, and 7000.

[0013] According to an embodiment of the present invention, the gain medium may be at least one of nanocrystals, organic laser dyes, and luminescent polymers, preferably nanocrystals. For example, the nanocrystals may be perovskite nanocrystals, preferably cesium lead halide perovskite nanocrystals.

[0014] According to an exemplary embodiment of the present invention, the gain medium is selected from cesium lead halide perovskite nanocrystals. By selecting different halogen ratios, gain medium materials with different luminescent colors can be obtained. For example, the cesium lead halide perovskite nanocrystals can be selected from CsPbCl3, CsPbCl1Br2, CsPbCl 1.5 Br 1.5 , CsPbBr3, CsPbBr2I, CsPbBr 1.5 I 1.5 , CsPbBr1I2 and CsPbI3, etc., one, two or more.

[0015] Preferably, the size of the cesium lead halide perovskite nanocrystals may be 10-100 nm, for example, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm.

[0016] According to an embodiment of the present invention, the scattering medium may be at least one of silica beads, polymer beads, metal nanoparticles, liquid crystals, etc., preferably silica beads.

[0017] Preferably, the particle size of the scattering medium is 100 nm-1 μm, exemplified by 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, and 1 μm.

[0018] According to an exemplary embodiment of the present invention, the mass ratio of the silica spheres to the cesium lead halide perovskite nanocrystals is 50:(1-10), and exemplary ratios are 50:2, 50:4, 50:6, 50:8, and 50:10.

[0019] According to an embodiment of the present invention, the periodic arrangement may be a sequential arrangement of RGB pixel array units, wherein the RGB pixel array unit is composed of an R array, a G array, and a B array that are sequentially arranged.

[0020] According to an embodiment of the present invention, the pixel structure of the RGB pixel array unit may be any regular shape, such as an N*N square array structure.

[0021] According to an embodiment of the present invention, the random laser has a microstructure, which can serve as a micro laser pixel.

[0022] The present invention also provides a method for constructing the aforementioned laser display panel with self-healing function, the method comprising the following steps:

[0023] 1) Place the PDMS prepolymer in a vacuum drying oven and evacuate the air several times to remove bubbles;

[0024] 2) coating the surface of a silicon template with periodic array patterns of pits with 1H,1H,2H,2H-perfluorooctyltriethoxysilane, and after complete evaporation, pouring the prepolymer from step 1) onto the surface of the silicon template, and performing high-temperature polymerization and peeling to obtain a cross-linked PDMS protrusion micro-template;

[0025] 3) dissolving the self-healing polymer material in an organic solvent, and then evenly filling the cross-linked PDMS protrusion micro-template obtained in step 2) with the mixed solution. After the organic solvent evaporates, the cross-linked PDMS protrusion micro-template is peeled off to obtain a periodically arranged groove-shaped self-healing polymer micro-template;

[0026] 4) Injecting printing ink into the self-healing polymer micro-template of step 3) to print an RGB pixel array.

[0027] According to an embodiment of the present invention, in step 2), the temperature of the high-temperature polymerization is 90-150°C, exemplified by 90°C, 120°C, and 150°C; further, the time of the high-temperature polymerization is 1-4h, exemplified by 1h, 2h, and 4h.

[0028] According to an embodiment of the present invention, in step 3), the self-healing polymer material has the definition and selection as described above.

[0029] Preferably, in step 3), the organic solvent for dissolving the self-healing polymer is selected from at least one of chloroform, dichloromethane and tetrahydrofuran, preferably chloroform.

[0030] Preferably, in step 3), the mass concentration of the self-healing polymer material in the organic solvent is 50-300 mg / mL, exemplified by 200 mg / mL, 100 mg / mL, 200 mg / mL, and 300 mg / mL.

[0031] Preferably, in step 3), the volatilization temperature is room temperature (25° C.), the volatilization environment is atmospheric environment, and the volatilization time is 24-48 hours, such as 24 hours, 36 hours, or 48 hours.

[0032] According to an embodiment of the present invention, in step 4), the printing ink is a mixed solution including a gain medium and a scattering medium; the gain medium and the scattering medium have the meanings and proportions as described above.

[0033] Preferably, the solvent used in the printing ink is an organic solvent, for example, at least one selected from n-hexane, toluene, and cyclohexane, preferably n-hexane.

[0034] Preferably, in step 4), the mass concentration of the gain medium is 50-200 mg / mL, exemplified by 50 mg / mL, 100 mg / mL, and 200 mg / mL.

[0035] According to an embodiment of the present invention, the printing ink includes printing ink 1, printing ink 2 and printing ink 3.

[0036] Preferably, the gain media in the printing ink 1, printing ink 2 and printing ink 3 are the same or different and are independently selected from at least one of nanocrystals, organic laser dyes and luminescent polymers, preferably nanocrystals. For example, the nanocrystals may be perovskite nanocrystals, preferably cesium lead halide perovskite nanocrystals. For example, the cesium lead halide perovskite nanocrystals may be selected from CsPbCl3, CsPbCl1Br2, CsPbCl 1.5 Br 1.5 , CsPbBr3, CsPbBr2I, CsPbBr 1.5I 1.5 , CsPbBr1I2 and CsPbI3, etc., one, two or more.

[0037] Preferably, the scattering media in the printing ink 1, printing ink 2 and printing ink 3 are the same or different and are independently selected from at least one of silica spheres, polymer spheres, metal nanoparticles and liquid crystals, preferably silica spheres.

[0038] According to an exemplary embodiment of the present invention, the printing ink 1 includes a gain material 1, a scattering medium and an organic solvent. The gain material 1 can be CsPbCl 1.5 Br 1.5 Nanocrystals. For example, the printing ink 2 includes a gain material 2, a scattering medium, and an organic solvent, and the gain material 2 may be CsPbBr3 nanocrystals. For example, the printing ink 3 includes a gain material 3, a scattering medium, and an organic solvent, and the gain material 3 may be CsPbBr1I2 nanocrystals.

[0039] The present invention does not particularly limit the printing method, and those skilled in the art can print according to conventional methods to obtain an RGB pixel array. For example, the printing can be contact substrate printing. Preferably, the printing can include a controllable micro-manipulator arm and a glass needle; the micro-manipulator arm can be controlled by a computer program to achieve precise movement, and its movement range is 1μm-5cm (exemplarily 100μm); the glass needle is conical, and the inner diameter of the needle tip can be 20-50μm (exemplarily 50μm); the printing ink is sucked into the needle by capillary force; by adjusting the printing (release) voltage, the printing ink in the needle can be accurately injected into the self-healing polymer micro template. Wherein, the printing (release) voltage can be 0.1-2.0V (exemplarily 1.0V).

[0040] According to an embodiment of the present invention, in step (4), the printing ink can be injected into the self-healing polymer micro-template in columns and printed sequentially. For example, by replacing the printing ink, an RGB pixel array unit (where three adjacent RGB sub-pixels in the same row constitute a complete pixel) can be printed sequentially to obtain an R array, a G array, and a B array.

[0041] According to an embodiment of the present invention, the preparation method may optionally further include step 5): under the excitation of laser, the sub-pixels in the RGB pixel array emit RGB random laser and mixed color laser to obtain the self-healing laser display panel.

[0042] Preferably, in step 5), the laser may be a femtosecond laser, and its wavelength may be 360-420 nm, exemplified by 360 nm, 380 nm, and 400 nm.

[0043] Preferably, in step 5), when the laser excites the RGB pixel points, three-color random lasers corresponding to red, green and blue can be obtained.

[0044] According to an embodiment of the present invention, the preparation method may optionally further comprise step 6): after the self-healing display panel is damaged by external force, placing the panel on a heating platform to promote healing.

[0045] Preferably, in step 6), the temperature of the heating stage may be 30-50° C., exemplified by 30° C., 35° C., 40° C., or 50° C. Furthermore, the healing time may be 8-24 hours, exemplified by 10 hours, 15 hours, or 24 hours.

[0046] The present invention also provides an application of the above-mentioned laser display panel with self-healing function in a wearable device.

[0047] Beneficial effects of the present invention:

[0048] (1) The self-healing laser display panel of the present invention includes a blank micro-template composed of a self-healing polymer and a random laser injected into the micro-template by inkjet printing; the random laser includes a gain medium and a scattering medium, wherein the gain medium can be at least one of nanocrystals, organic laser dyes, luminescent polymers, etc., and the scattering medium can be at least one of silica spheres, polymer spheres, metal nanoparticles, liquid crystals, etc. The gain medium and scattering medium of the present invention increase the scattering degree of the material system, so that the light source forms a closed-loop optical feedback loop inside the material by relying on the multiple scattering mechanism. Based on the above-mentioned unique optical feedback mechanism, the present invention does not require a regular resonant cavity, but only relies on the scattering degree provided by the scattering medium. Therefore, the laser of the present invention can still maintain laser performance after being damaged externally, which is conducive to the construction of a self-healing laser display panel. The laser display panel prepared by the present invention can still maintain stable laser emission after damage repair, and the display effect can also be well maintained, thereby indicating that the display panel prepared by the present invention has a self-healing function.

[0049] Moreover, the random laser of the present invention has excellent solution processing performance and is easy to prepare a micro-laser pixel array through printing technology, thereby realizing the construction of a laser display panel; the micro-laser pixel array has a periodic arrangement characteristic, which is easy to realize mixed-color laser output and easy to realize full-color laser display under specific excitation methods.

[0050] (2) The preparation method of the self-healing polymer blank template of the present invention is simple, easy to obtain, repeatable and can be prepared in large quantities.

[0051] (3) The self-healing display panel of the present invention has good skin adhesion ability and can be used in the construction of wearable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 Schematic diagram of the preparation process of the self-healing laser display panel of the present invention.

[0053] Figure 2 This is a fluorescence microscopic characterization image of the laser three-color pixel point prepared in Example 1 of the present invention.

[0054] Figure 3 This is a characterization diagram of the laser emission properties of the micro laser pixel produced in Example 1 of the present invention.

[0055] Figure 4 These are characterization images of pixels of the self-healing laser display panel prepared in Example 1 of the present invention before and after healing.

[0056] Figure 5 Characterization diagram of the laser performance of pixels before and after healing of the self-healing laser display panel prepared in Example 1 of the present invention

[0057] Figure 6 This is a characterization diagram of the large-area display effect of the self-healing laser display panel made by the present invention before and after healing.

[0058] Figure 7 This is a characterization diagram of the skin adhesion effect of the self-healing laser display panel prepared by the present invention. DETAILED DESCRIPTION

[0059] The technical solutions of the present invention will be described in further detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are encompassed within the scope of protection that the present invention is intended to protect.

[0060] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0061] Preparation Example 1 Preparation of CsPbBr3 perovskite nanocrystals, including the following steps:

[0062] (1) A mixture of cesium carbonate (81.4 mg), octadecene (4.0 mL), and oleic acid (0.25 mL) was placed in a 50 mL three-necked flask and reacted at 120°C under argon atmosphere for 1 h. The temperature was then raised to 150°C for another 0.5 h until the cesium carbonate and oleic acid reacted completely to obtain a cesium oleate mixed solution.

[0063] (2) Then, octadecene (5.0 mL), lead bromide (0.188 mM), oleic acid (0.5 mL), and oleylamine (0.5 mL) were placed in a 50 mL three-necked flask. The mixture was heated under vacuum at 50°C for 30 min, and then the temperature was raised to 120°C for 1 h.

[0064] (3) The temperature was raised to 180°C, and the cesium oleate mixed solution (0.4 mL) obtained in step (1) was rapidly injected. After reacting for 5 minutes, the mixture was cooled to room temperature in an ice-water bath, washed three times with toluene and isopropanol, and centrifuged (at a centrifugal speed of 3000 rpm) for further use, thereby obtaining CsPbBr3 perovskite nanocrystals.

[0065] Similarly, other luminescent perovskite nanocrystals were prepared according to the method of Preparation Example 1, with the only difference being the adjustment of the ratio of different halogens, such as:

[0066] CsPbCl 1.5 Br 1.5 The nanocrystals were prepared according to the above process, except that the lead bromide (0.188 mM) in step (2) was adjusted to lead chloride and lead bromide dissolved in a molar ratio of 1:1 (0.094 mM lead chloride + 0.094 mM lead bromide).

[0067] CsPbBr1I2 nanocrystals were prepared according to the above process, except that the lead bromide (0.188 mM) in step (2) was adjusted to lead bromide and lead iodide dissolved in a molar ratio of 1:2 (0.0627 mM lead bromide + 0.125 mM lead iodide).

[0068] Preparation Example 2 Self-healing polymer PDMS-MPU 0.4 -IU 0.6 The preparation comprises the following steps:

[0069] (1) Weigh 10 g of aminopropyl dicapped polydimethylsiloxane (H2N-PDMS-NH2, Mn = 5000), add 1 mL of triethylamine and 40 mL of chloroform, and stir at 0°C under argon for 1 h to dissolve the polymer;

[0070] (2) 0.2 mg of 4,4'-methylenebis(phenyl isocyanate) (MPU) and 0.27 mg of isophorone diisocyanate (IU) were dissolved in 500 μL of chloroform and added dropwise to the aminopropyl di-terminated polydimethylsiloxane solution prepared in step (1) through a glass syringe, maintained at 0°C for 1 hour, and continuously stirred at room temperature for four days;

[0071] (3) Add 1.5 mL of methanol to the reaction solution obtained in step (2) and stir for 0.5 h. Then add 6 mL of methanol and let it settle. Separate the precipitate and the supernatant, dissolve the precipitate in 10 mL of chloroform, wash it three times, and dry it for later use.

[0072] Example 1 Preparation of a laser display panel pixel array unit includes the following steps:

[0073] 1) Degas commercial PDMS prepolymer (Sylgard 184, purchased from Dow Corning) in a vacuum drying oven several times to remove air bubbles;

[0074] 2) A pit silicon template engraved with a periodic array pattern (purchased from Beijing Zhongke Jiming Technology Co., Ltd.) was ultrasonicated in water, ethanol, toluene, dichloromethane, isopropanol, acetone, and ethanol in that order for 10 minutes each. The surface of the silicon template was blown dry with a nitrogen gun and cleaned in an ultraviolet (UV)-ozone plasma (100W) cleaning machine for 5 minutes to remove excess organic matter on the surface. A layer of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane was then coated on the surface of the silicon template (the coating method was: 150 μL of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane was added dropwise to the surface of the silicon template, the spin coating speed was 1000 rpm, and the time was 30 seconds), and the template was sealed and heated at 70°C for 30 minutes to completely evaporate it (to produce a hydrophobic effect on the surface of the silicon template);

[0075] 3) pouring the prepolymer prepared in step 1) onto the surface of the silicon template prepared in step 2), polymerizing at 120° C. for 2 h, and peeling off to obtain a cross-linked PDMS protrusion micro-template;

[0076] 4) The self-healing PDMS-MPU prepared in Preparation Example 2 0.4 -IU 0.6 The polymer was dissolved in chloroform at a concentration of 100 mg / mL. The mixture was then evenly filled into the cross-linked PDMS protrusion template obtained in step 3). After evaporation at room temperature (25°C) for 24 hours, the self-healing polymer micro-template with periodic grooves was obtained by peeling.

[0077] 5) The three perovskite nanocrystals (CsPbBr3, CsPbCl 1.5 Br 1.5, CsPbBr1I2) were dissolved in n-hexane at a concentration of 100 mg / mL, and silica beads with a diameter of 200 nm were added at a mass ratio of 50:10 to obtain three dispersed mixed solutions (printing ink);

[0078] 6) The printing ink prepared in step 5) was respectively drawn into a needle with a tip inner diameter of 50 μm by capillary action. The micromanipulator was then moved over the self-healing polymer micro-template prepared in step 4) under computer control, and the printing voltage was controlled to 1 V to prepare the RGB pixel array unit.

[0079] Figure 1 This is a flow chart for preparing a self-healing polymer blank template. The present invention utilizes a flexible PDMS soft template casting method, which is simple and easy to obtain, can be used repeatedly, and is not likely to damage the structure of the self-healing polymer during the casting process.

[0080] Figure 2 This is a three-color laser pixel array prepared by inkjet printing, from left to right are CsPbBr1I2, CsPbBr3, CsPbCl 1.5 Br 1.5 The nanocrystals are marked as R array, G array, and B array in the figure (the scale is 120μm). It can be seen from the figure that the array geometry is relatively perfect, the size is relatively uniform, and periodic arrangement can be achieved.

[0081] Example 2 Characterization of laser performance of pixel points

[0082] Figure 3 The laser properties of random laser microstructures used as sub-pixels were tested (the scale bar in the figure is 50μm). The selected gain medium silica microspheres provide the scattering environment required for laser emission. From left to right, the selected gain medium perovskite nanocrystals are (a) CsPbCl 1.5 Br 1.5 , (b) CsPbBr3, (c) CsPbBr1I2, under the excitation of femtosecond laser (excitation wavelength 400nm), with the increase of pump power, high-purity RGB random laser emission is achieved, which is conducive to achieving high color gamut coverage and high saturation display.

[0083] Example 3: Changes in morphology and laser performance before and after pixel healing

[0084] The pixel array surface was scratched with a blade, and the display panel was then heated at 35°C for 10 hours. The laser spectrum and pixel changes before and after heating were then characterized.

[0085] Figure 4(a) and (b) are bright field photos of the pixels before and after healing, respectively (scale is 150μm). It can be seen from the figures that after heating, the scratches on the pixels can be well repaired, and the morphology of the pixels remains relatively intact.

[0086] Figure 5 The laser spectra before and after pixel healing are shown in Figure 3. The changes in the laser spectra before and after healing further confirm that the random laser is not affected by the damage to the pixel structure caused by healing, but can maintain stable laser emission by relying on the scattering degree of the environment, thereby confirming that the laser display panel of the present invention has good self-healing ability.

[0087] Example 4 Characterization of the healing ability and skin adhesion ability of large-area display effects

[0088] By designing specific printing locations on the self-healing polymer microtemplate, the printing ink containing 100 mg / mL CsPbBr perovskite nanocrystals prepared in Example 1 was selectively injected into the self-healing polymer microtemplate. A large-area "8"-shaped display pattern was prepared using inkjet printing technology. Scratches were created on the display pattern surface using a blade shearing method, and the display effect before and after damage and healing of the large-area pattern, as well as the skin adhesion ability, were characterized. Figure 6 Displaying the "8"-shaped display pattern can achieve healing after injury, and the display effect of the "8"-shaped display pattern can also be basically maintained.

[0089] The above-mentioned "8"-shaped display pattern that healed after injury was attached to the skin. The results were as follows: Figure 7 As shown in the figure, the results show that the large-area display pattern of the present invention can achieve a good adhesion effect with the human skin, thereby confirming that the display panel of the present invention has great application potential in realizing wearable devices.

[0090] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A laser display panel with self-healing function, characterized in that: The laser display panel includes a periodically arranged RGB pixel array unit, the RGB pixel array unit includes a self-healing polymer micro-template and a random laser, and the random laser is filled inside the self-healing polymer micro-template; The random laser includes a gain medium and a scattering medium; The mass ratio of the gain medium to the scattering medium is 50:(1-10); The gain medium is at least one of nanocrystals, organic laser dyes and light-emitting polymers, and the nanocrystals are perovskite nanocrystals; The scattering medium is at least one of silicon dioxide beads, polymer beads, metal nanoparticles and liquid crystals.

2. The laser display panel with self-healing function according to claim 1, wherein: The self-healing polymer micro-template serves as a blank pixel, and the random lasers are uniformly filled inside the self-healing polymer micro-template.

3. The laser display panel with self-healing function according to claim 2, wherein: The pixel structure of the self-healing polymer micro-template is of any regular shape.

4. The laser display panel with self-healing function according to claim 3, wherein: The pixel structure of the self-healing polymer micro-template is square; And / or, the side length of the self-healing polymer micro-template is 10-100 μm.

5. The laser display panel with self-healing function according to any one of claims 1 to 4, wherein: The self-healing polymer material in the self-healing polymer micro-template is a polymer elastomer with polydimethylsiloxane as the main chain, and the polymer elastomer is PDMS-MPU 0.4 -IU 0.6 , its molecular structure is shown below:

6. The laser display panel with self-healing function according to claim 5, wherein: The self-healing polymer elastomer PDMS-MPU 0.4 -IU 0.6 The number average molecular weight (Mn) is 5000-7000.

7. The laser display panel with self-healing function according to any one of claims 1 to 4, characterized in that: The nanocrystals are cesium lead halide perovskite nanocrystals; The cesium lead halide perovskite nanocrystals are selected from CsPbCl3, CsPbCl1Br2, CsPbCl 1.5 Br 1.5 , CsPbBr3, CsPbBr2I, CsPbBr 1.5 I 1.5 , one, two or more of CsPbBr1I2 and CsPbI3; and / or, the size of the cesium lead halide perovskite nanocrystals is 10-100 nm; And / or, the particle size of the scattering medium is 100 nm-1 μm.

8. The laser display panel with self-healing function according to any one of claims 1 to 4, wherein: The periodic arrangement is that RGB pixel array units are arranged in sequence, and the RGB pixel array unit is composed of an R array, a G array and a B array arranged in sequence; And / or, the pixel structure of the RGB pixel array unit is an arbitrary regular shape; And / or, the random laser has a microstructure, which can serve as a micro laser pixel.

9. The method for constructing a laser display panel with a self-healing function according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: 1) Degas the PDMS prepolymer in a vacuum drying oven several times to remove bubbles; 2) coating the surface of a silicon template with periodic array patterns of pits with 1H,1H,2H,2H-perfluorooctyltriethoxysilane, and after complete evaporation, pouring the prepolymer from step 1) onto the surface of the silicon template, and performing high-temperature polymerization and peeling to obtain a cross-linked PDMS protrusion micro-template; 3) dissolving the self-healing polymer material in an organic solvent, and then evenly filling the cross-linked PDMS protrusion micro-template obtained in step 2) with the mixed solution. After the organic solvent evaporates, the cross-linked PDMS protrusion micro-template is peeled off to obtain a periodically arranged groove-shaped self-healing polymer micro-template; 4) Injecting printing ink into the self-healing polymer micro-template of step 3) to print an RGB pixel array.

10. The construction method according to claim 9, wherein: In step 2), the temperature of the high temperature polymerization is 90-150° C., and the time of the high temperature polymerization is 1-4 hours; And / or, in step 3), the mass concentration of the self-healing polymer material in the organic solvent is 50-300 mg / mL; And / or, in step 4), the printing ink is a mixed solution including a gain medium and a scattering medium; And / or, the solvent used in the printing ink is an organic solvent, for example, at least one selected from n-hexane, toluene and cyclohexane; And / or, in step 4), the mass concentration of the gain medium is 50-200 mg / mL.

11. The construction method according to claim 9 or 10, wherein: The printing ink includes a first ink, a second ink and a third ink; The gain media in the first ink, the second ink and the third ink are the same or different and are independently selected from at least one of nanocrystals, organic laser dyes and light-emitting polymers, wherein the nanocrystals are perovskite nanocrystals; The scattering media in the first ink, the second ink and the third ink are the same or different and are independently selected from at least one of silica spheres, polymer spheres, metal nanoparticles and liquid crystals.

12. The construction method according to claim 11, wherein: The nanocrystal is a cesium lead halide perovskite nanocrystal, and the cesium lead halide perovskite nanocrystal is selected from CsPbCl3, CsPbCl1Br2, CsPbCl 1.5 Br 1.5 , CsPbBr3, CsPbBr2I, CsPbBr 1.5 I 1.5 , one, two or more of CsPbBr1I2 and CsPbI3; The scattering medium is silica spheres.

13. Use of the laser display panel with self-healing function according to any one of claims 1 to 8 and / or the laser display panel with self-healing function obtained by the construction method according to any one of claims 9 to 12 in wearable devices.

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