Transparent display fabrication process based on triple strong directional scattering of dielectric particles

Abstract

The fabrication process of a transparent display screen based on the triple strong directional scattering of dielectric particles includes the following steps: (1) mixing transparent substrate material and dielectric sphere particles in a mixer; (2) drying the mixed material in a drying oven to remove moisture; (3) stretching the uniformly mixed and dried material in a casting machine to ensure that the thickness of the stretched film does not exceed 0.1 mm. The mechanism of the color transparent display screen provided by this invention is the triple strong directional scattering of dielectric particles, which can simultaneously achieve high forward scattering characteristics of red, green and blue bands in simple dielectric sphere particles. Therefore, most of the light can be localized to one side of the display screen, which is significantly improved in terms of display brightness and color display compared to the reported nanostructures that only support a single LSP resonance. The thickness of the transparent display screen can be controlled below 0.1 mm, which provides a new idea and method for the fabrication of transparent display screens based on the strong directional scattering of dielectric particles and has great application prospects.

Description

Technical Field

[0001] This invention belongs to the field of transparent display technology, specifically relating to a process for manufacturing a transparent display screen based on triple strong directional scattering of dielectric particles. Background Technology

[0002] Transparent display technology, with its transparent display panel, makes information more intuitive, richer, and more intelligent. It can be used for head-up displays (HUDs), head-mounted projection displays, and floating displays for building windows and shop windows, attracting increasing attention and gradually becoming a trend in contemporary display technology development. HUDs, based on the principle of optical reflection, project flight and driving-related information onto a transparent display screen and integrate it with the information displayed on the HUD. This plays a crucial role in improving aircraft flight quality, enhancing combat effectiveness and reliability, and ensuring the safety of flight personnel and passengers. Furthermore, according to the "China Automotive HUD Industry Research and Future Forecast Report (2020 Edition)," the demand for HUDs in civilian vehicles is rising, with huge future market potential and broad application prospects. The US market research firm Displaybank also predicted in its "Transparent Display Technology and Market Outlook" report that the market value of transparent displays will reach approximately $87.2 billion by 2025. Currently, existing HUD systems face shortcomings such as narrow viewing angles, low transparency, and low signal brightness. How to efficiently optimize these issues has attracted widespread attention.

[0003] At present, there is still much room for improvement in terms of viewing angle, transparency, signal brightness, and color display of projection transparent displays based on transparent substrates. Narrow viewing angle limits the position of the observer. In order to broaden the viewing angle, the commonly used method is to use a diffuse reflection screen, which has a good effect on broadening the viewing angle. However, since the diffuse reflection screen does not have wavelength selectivity and directionality in scattering light, this method will cause the screen transparency to drop drastically. The localized plasmon resonance mode supported by metal nanostructures can localize light to the subwavelength size, and thus can wavelength selectively enhance light scattering, which has a great advantage in improving the performance of transparent displays. In recent years, Hsu et al.

[12] of MIT have achieved high-contrast transparent blue light display by using silver sphere particles that support LSP resonance. Saito et al. of the University of Tokyo have experimentally achieved transparent blue and green displays by using two scattering peaks obtained by the interaction between the SP resonance of silver nanocubic particles and TiO2 substrate; Ye et al. of Nanyang Technological University in Singapore have achieved transparent green light display by using the SP resonance of Ag@TiO2 core-shell structure. However, current transparent display technologies based on plasmonic nanoparticles mainly focus on optimizing the SP resonance performance of the particles, and it is difficult to achieve narrow-band strong scattering of the red, green and blue (RGB) bands in the same structure at the same time, so as to meet the application of high-saturation color transparent displays.

[0004] The Mie electromagnetic resonance modes and their interactions in metallic and dielectric nanostructures exhibit Fano resonance and directional scattering characteristics, which can further enhance the scattering peak and enrich light scattering performance, thus playing a greater role in improving the performance of transparent displays. As early as 1983, Kerker et al. proposed that when the relative permittivity of magnetic particles... ε and permeability μUnder certain conditions, the same-order electromagnetic Mie coefficients supported by particles are equal and will oscillate in phase or out of phase, resulting in zero backscattering (first Kerker condition) or zero forward scattering (second Kerker condition). This provides important theoretical guidance for the study of directional scattering. However, due to the lack of magnetic materials in the optical band, directional scattering has not been experimentally realized for many years. In recent years, with the deepening research on high-dielectric materials supporting magnetic resonance, researchers have used high-dielectric materials to achieve zero backscattering in different bands by satisfying the Kerker condition. In addition to using the Kerker condition, the applicant's research group proposed that zero or near-zero forward scattering can also be achieved based on the interaction of multiple order electromagnetic modes. Tsuchimoto et al. experimentally demonstrated zero backscattering induced by Fano resonance in the Si@SiO2 core-shell structure. Recently, researchers have also achieved simultaneous suppression of backscattering and forward scattering through Fano interference between electric and magnetic poles. However, to achieve color transparent display applications, triple directional scattering must be constructed in the red, green, and blue bands. Currently, most visible light directional scattering methods utilize non-resonant interference of electric and magnetic dipole modes, thus failing to significantly improve the directional scattering intensity. While zero backscattering based on the resonant interference of electric and magnetic dipoles in metal-high dielectric nanostructures exhibits strong forward scattering, its wide linewidth and its occurrence in the infrared band preclude its use in transparent displays. Furthermore, achieving strong RGB triple directional scattering within the same structure presents challenges. Therefore, designing a structure that exhibits strong triple directional scattering in the red, green, and blue bands will play a crucial role in improving transparent display performance. However, no reports have been found regarding the use of nanostructures for directional scattering to improve transparent display performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a simple, low-cost, transparent display fabrication process based on triple strong directional scattering of dielectric particles, which offers excellent transparency, is easier to industrialize, and is more readily applicable to industrial production.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a transparent display screen fabrication process based on triple strong directional scattering of dielectric particles, characterized by comprising the following steps:

[0007] (1) Put the transparent matrix material and the medium sphere particles into the mixer and mix them;

[0008] (2) Place the mixed material in a drying oven to dry and remove moisture;

[0009] (3) Place the well mixed and dried material into the casting machine for film stretching, ensuring that the thickness of the stretched film does not exceed 0.1 mm.

[0010] Furthermore, the transparent matrix material uses transparent organic materials such as PVA (polyvinyl alcohol), PET (polyterephthalic acid plastic), and PETG / PMMA (transparent plastic / polymethyl methacrylate).

[0011] Furthermore, the dielectric spheres are one or more of SiC, TiO2, or other materials with similar dielectric constant properties.

[0012] Furthermore, when mixing materials using a mixer in step (1), the mass ratio of the medium particles to the transparent matrix material is 1:4000 to 1:500. The mass ratio can be adjusted according to different scenario requirements. The mixing time is not less than 2 hours.

[0013] Furthermore, in step (2), the drying temperature of the drying oven shall not exceed the melting point of the transparent organic material, and the drying time shall not be less than 2 hours.

[0014] Furthermore, in step (3), the temperature of the casting machine during the film stretching process should be about 30°C higher than the melting point of the transparent organic material, and the film thickness should not exceed 0.1mm.

[0015] Furthermore, when designing and optimizing dielectric spheres, the dielectric constant of the dielectric material is derived from experimental data; simultaneously, it must support triple strong directional scattering in the red, green, and blue light bands to improve the performance of color transparent displays. For example, the dielectric constant of SiC is derived from experimental data [S. Singh, JR Potopowicz, LG Van Uitert and SH Wemple. Nonlinear optical properties of hexagonal silicon carbide, Appl. Phys. Lett. 19, 53 (1971)], and the dielectric constant of TiO2 is derived from experimental data [JR Devore. Refractive indices of rutile and sphalerite, J. Opt. Soc. Am. 41, 416-419 (1951)].

[0016] Furthermore, the dielectric spheres are made of SiC material, and a suitable radius is selected using Mie scattering theory. Taking a radius of 175nm as an example, it is possible to achieve a forward scattering peak wavelength of [missing value] in the blue light band. λ =454nm, ensuring that the forward scattering efficiency is greater than 10 in the range of -30° to +30° angle with the direction perpendicular to the transparent display; achieving a forward scattering peak wavelength of 454nm in the green light band. λ=532nm, which makes the forward scattering efficiency greater than 10 in the range of -30° to +30° with the direction perpendicular to the transparent display screen; the forward scattering peak wavelength of the red light band is λ=640nm, which makes the forward scattering efficiency greater than 10 in the range of -40° to +40° with the direction perpendicular to the transparent display screen.

[0017] Furthermore, the dielectric spheres are made of TiO2 material, with a preferred radius of 175nm. This enables the forward scattering peak wavelength of the blue light band to be λ=450nm, concentrating most of the light in a forward scattering direction within a range of -30° to +30° from the angle perpendicular to the transparent display screen; the forward scattering peak wavelength of the green light band to be λ=532nm, concentrating most of the light in a forward scattering direction within a range of -30° to +30° from the angle perpendicular to the transparent display screen; and the forward scattering peak wavelength of the red light band to be λ=640nm, concentrating most of the light in a forward scattering direction within a range of -40° to +40° from the angle perpendicular to the transparent display screen.

[0018] Furthermore, one side of the transparent display screen is provided with an adhesive layer, a release film is provided on the surface of the adhesive layer, and an anti-scratch film is provided on the surface of the release film. The connection between the transparent display film and the adhesive layer is achieved by hot melt adhesive spraying and extrusion coating using a coating and composite equipment.

[0019] Using the above technical solutions, the Mie electromagnetic resonance modes in metal and dielectric nanostructures and their interactions exhibit directional scattering characteristics, which can further enhance the scattering peaks in certain directions and enrich light scattering performance, thus playing a greater advantage in improving the performance of transparent displays. However, to achieve color transparent display applications, triple directional scattering must be constructed in the red, green, and blue bands. Currently, most directional scattering in the visible light band utilizes non-resonant interference of electric and magnetic dipole modes, so the directional scattering intensity cannot be significantly improved. While zero backscattering based on the resonant interference of electric and magnetic dipoles in metal-high dielectric nanocore-shell structures has strong forward scattering, its linewidth is wide and it occurs in the infrared band, making it unsuitable for transparent display applications. Furthermore, achieving strong RGB triple directional scattering in the same structure also presents certain challenges. Therefore, finding suitable materials and structures to fully utilize the interactions of multiple electromagnetic modes to achieve strong RGB triple directional scattering can provide new mechanisms and methods for simultaneously improving the transparency, signal brightness, and color saturation of transparent displays.

[0020] Based on the above concepts, this invention proposes a novel fabrication process for a color transparent display screen based on triple strong directional scattering by dielectric particles. The transparent display screen comprises a transparent substrate material and dielectric nanoparticles. When a projector projects light onto the transparent display screen, the presence of the dielectric particles scatters the projected light into the viewer's eyes, allowing them to see the image on the screen. The transparent display screen of this invention exhibits excellent performance in rear projection (rear projection occurs when the observer and projector are on opposite sides of the screen, while front projection occurs when they are on the same side). The dielectric nanoparticles are preferably spherical in shape because spheres are insensitive to light polarization, and their scattering spectrum and the contribution of each electromagnetic mode can be analytically solved using Mie scattering theory.

[0021] Based on Mie scattering theory, the scattering efficiency of the dielectric sphere nanostructure was analytically calculated. During the calculation, the dielectric constant of the dielectric particles could be found in previously reported literature or directly measured using a dielectric constant meter. In this invention, the dielectric constant of SiC was obtained from experimental data [S. Singh, JR Potopowicz, LG Van Uitert and SH Wemple. Nonlinear optical properties of hexagonal silicon carbide, Appl. Phys. Lett. 19, 53 (1971)], and the dielectric constant of TiO2 was obtained from experimental data [JR Devore. Refractive indices of rutile and sphalerite, J. Opt. Soc. Am. 41, 416-419 (1951)].

[0022] The mechanism of the color transparent display screen provided by this invention is the triple strong directional scattering of dielectric particles. It can simultaneously achieve high forward scattering characteristics in the red, green, and blue bands within simple dielectric spherical particles, thus localizing most of the light to one side of the display screen. This results in a significant improvement in display brightness and color display compared to reported nanostructures that only support a single LSP resonance. Furthermore, the fabrication method provided by this invention saves time and is not limited by molds compared to traditional liquid-phase drying film deposition methods, enabling the convenient and rapid fabrication of large-area, flexible, and transferable transparent displays. The thickness of the transparent display screen can be controlled below 0.1 mm, providing a new approach and method for the fabrication of transparent displays based on strong directional scattering of dielectric particles, with great application potential. Attached Figure Description

[0023] Figure 1 The diagram illustrates the imaging principle of a transparent display screen with enhanced dielectric particles. It employs a rear projection method, where the light source is the projector's own light source, which projects onto the transparent display screen to achieve imaging.

[0024] Figure 2 The scattering image of SiC with radius r = 100 nm;

[0025] Figure 3 The scattering image of SiC with radius r = 125 nm;

[0026] Figure 4 The scattering image of SiC with radius r = 150 nm;

[0027] Figure 5 The scattering image of SiC with radius r = 200 nm;

[0028] Figure 6 This is a scattering image of TiO2 with a radius r = 100 nm;

[0029] Figure 7 The scattering image of TiO2 with radius r = 125 nm;

[0030] Figure 8 The scattering image of TiO2 with radius r = 150 nm;

[0031] Figure 9 This is a scattering image of TiO2 with a radius r = 200 nm;

[0032] Figure 10 The total scattering contribution of SiC at each order is plotted.

[0033] Figure 11 The total scattering contribution of TiO2 at each order is plotted.

[0034] Figure 12 The front and backscattering spectra of SiC with a radius of 175 nm;

[0035] Figure 13 The front and backscattering spectra of TiO2 with a radius of 175 nm;

[0036] Figure 14 This is a scattering angle diagram of SiC at a wavelength of 440 nm;

[0037] Figure 15 This is a scattering angle diagram of SiC near a wavelength of 526 nm;

[0038] Figure 16 This is a scattering angle diagram of SiC near a wavelength of 662 nm;

[0039] Figure 17 This is a scattering angle diagram of SiC at a wavelength of 453 nm;

[0040] Figure 18This is a scattering angle diagram of SiC near a wavelength of 526 nm;

[0041] Figure 19 This is a scattering angle diagram of SiC at a wavelength of 647 nm. Detailed Implementation

[0042] The transparent display fabrication process based on triple strong directional scattering of dielectric particles of the present invention includes the following steps:

[0043] (1) Put the transparent matrix material and the medium sphere particles into the mixer and mix them;

[0044] (2) Place the mixed material in a drying oven to dry and remove moisture;

[0045] (3) Place the well mixed and dried material into the casting machine for film stretching, ensuring that the thickness of the stretched film does not exceed 0.1 mm.

[0046] The transparent matrix material uses transparent organic materials such as PVA (polyvinyl alcohol), PET (polyterephthalic acid plastic), and PETG / PMMA (transparent plastic / polymethyl methacrylate).

[0047] The dielectric spheres are one or more materials such as SiC, TiO2, or other materials with similar dielectric constant properties.

[0048] When mixing materials using a mixer in step (1), the mass ratio of the medium particles to the transparent matrix material is 1:4000 to 1:500. The mass ratio can be adjusted according to different scenario requirements. The mixing time is not less than 2 hours.

[0049] In step (2), the drying temperature of the drying oven shall not exceed the melting point of the transparent organic material, and the drying time shall not be less than 2 hours.

[0050] In step (3), the temperature of the casting machine during the film stretching process should be about 30°C higher than the melting point of the transparent organic material, and the film thickness should not exceed 0.1mm.

[0051] When designing and optimizing dielectric spheres, the dielectric constant of the dielectric material is derived from experimental data; simultaneously, it must support strong tri-directional scattering in the red, green, and blue light bands to improve the performance of color transparent displays. For example, the dielectric constant of SiC is derived from experimental data [S. Singh, JR Potopowicz, LG Van Uitert and SH Wemple. Nonlinear optical properties of hexagonal silicon carbide, Appl. Phys. Lett. 19, 53(1971)], and the dielectric constant of TiO2 is derived from experimental data [JR Devore. Refractive indices of rutile and sphalerite, J. Opt. Soc. Am. 41, 416-419 (1951)].

[0052] The dielectric spheres are made of SiC material. A suitable radius is selected using Mie scattering theory; for example, a radius of 175 nm can achieve a forward scattering peak wavelength of [wavelength value missing] in the blue light band. λ =454nm, ensuring that the forward scattering efficiency is greater than 10 in the range of -30° to +30° angle with the direction perpendicular to the transparent display; achieving a forward scattering peak wavelength of 454nm in the green light band. λ =532nm, which makes the forward scattering efficiency greater than 10 in the range of -30° to +30° with the direction perpendicular to the transparent display screen; the forward scattering peak wavelength of the red light band is λ=640nm, which makes the forward scattering efficiency greater than 10 in the range of -40° to +40° with the direction perpendicular to the transparent display screen.

[0053] The dielectric spheres are made of TiO2 material, with a preferred radius of 175nm. They can achieve a forward scattering peak wavelength of λ=450nm in the blue light band, concentrating most of the light in a forward scattering direction within the range of -30° to +30° with respect to the direction perpendicular to the transparent display screen; a forward scattering peak wavelength of λ=532nm in the green light band, concentrating most of the light in a forward scattering direction within the range of -30° to +30° with respect to the direction perpendicular to the transparent display screen; and a forward scattering peak wavelength of λ=640nm in the red light band, concentrating most of the light in a forward scattering direction within the range of -40° to +40° with respect to the direction perpendicular to the transparent display screen.

[0054] The transparent display screen has an adhesive layer on one side, a release film on the surface of the adhesive layer, and a scratch-resistant film on the surface of the release film. The connection between the transparent display film and the adhesive layer is achieved by hot melt adhesive spraying and extrusion coating using a coating and composite equipment.

[0055] The design concept of this invention is based on Mie scattering theory, which shows that the scattering efficiency of nanoparticles is related to the particle radius, refractive index, and surrounding environment. For the dielectric spherical particles involved in this invention, once the material is selected, the refractive index is determined. Since the refractive index nb of transparent organic materials is also determined to be approximately 1.5 in the visible light band, the position and peak value of the scattering peak can be changed by altering the radius of different dielectric particles. This is achieved by calculating the total scattering efficiency of SiC and TiO2 spherical particles with different radii and the contribution spectra of the first four electromagnetic modes to the scattering efficiency, such as... Figure 1 , Figures 2-5 As shown, TM1-TM4 correspond to electric dipoles, electric quadrupoles, electric octupoles, and electric hexapoles, respectively; TE1-TE4 correspond to magnetic dipoles, magnetic quadrupoles, magnetic octupoles, and magnetic hexapoles, respectively. It was found that as the particle radius increases, the resonance position of the same-order electromagnetic modes undergoes a redshift. Therefore, the optimal structural radius can be determined to achieve resonance in the red, green, and blue wavebands.

[0056] For SiC materials, the preferred scattering radius is 175 nm. Further calculations are performed on the total scattering efficiency and the contribution spectra of the first four electromagnetic modes to the scattering efficiency at this radius, such as... Figures 6-9 As shown, three resonance peaks were found in the red, green, and blue light bands, namely: 442 nm (blue light band), 529 nm (green light band), and 662 nm (red light band). Furthermore, it was found that the blue light band is mainly contributed by the TE4 and TM3 modes, the green light band mainly by the TE3, TM3, and TM2 modes, and the red light band mainly by the TE2, TE1, TM2, and TM1 modes. For TiO2 material, the optimal radius is 175 nm. Further calculations were made of the total scattering efficiency and the contribution spectra of the first four electromagnetic modes to the scattering efficiency, as shown below. Figure 10 As shown, three resonance peaks were found in the red, green and blue bands, namely: 454nm (blue band), 527nm (green band) and 644nm (red band). Similarly, it was found that the blue band was mainly contributed by the TE4 and TM3 modes, the green band was mainly contributed by the TE3, TM3 and TM2 modes, and the red band was mainly contributed by the TE2, TE1, TM2 and TM1 modes.

[0057] To further illustrate the effect of directional scattering, the forward and backscattering efficiency spectra of optimized TiO2 and SiC spheres with a radius of 175 nm were calculated, as follows: Figure 12 and 13As shown in the figure (solid lines represent forward scattering, dashed lines represent backscattering), it can be seen that the forward scattering efficiency of TiO2 and SiC is much higher than that of the backscattering peak. SiC has the highest forward scattering peak efficiency at 53.55 nm, corresponding to a peak position of 524 nm (green light). Similarly, TiO2 has the highest forward scattering peak efficiency at 53.43 nm, corresponding to a peak position of 527 nm (green light). To more clearly observe the scattering efficiency at other scattering angles, the scattering spectrum as a function of angle was further calculated, as shown below. Figures 14-19 As shown in the diagram. For the scattering angle distribution of SiC, Figure 14 This is a scattering angle diagram near the wavelength of 440nm. At 440nm (blue light band), the forward scattering angle ranges from approximately -30° to +30°, and the scattering efficiency is enhanced by more than 10 times. Figure 15 The diagram shows the scattering angles near the wavelength of 526nm (green light band). The forward scattering angles of these two bands are within a viewing angle range of approximately -30° to +30°, and the forward scattering efficiency is enhanced by more than 10 times. Figure 16 The diagram shows the scattering angles around a wavelength of 662 nm (red light band). Forward scattering at this wavelength exhibits an efficiency enhancement of more than 10 times within a viewing angle range of approximately -30° to +30°. Similarly, for TiO2 particles, three resonant wavelengths were selected as follows: 453 nm (blue light band), 526 nm (green light band), and 647 nm (red light band). Figure 6 The diagram shows the scattering angle distribution of TiO2. Figure 17 The diagram shows the scattering angles near a wavelength of 453nm (blue light band). The forward scattering angle ranges from approximately -30° to +30°, significantly enhancing the scattering capability and achieving a scattering efficiency of over 10. Figure 18 This is a scattering angle diagram near a wavelength of 526nm (green light band). Figure 19 The diagram shows the scattering angles around a wavelength of 647nm. At 647nm (red light band), the forward scattering angle is within a viewing angle of approximately -40° to +40°, where scattering is significantly enhanced, with a scattering efficiency exceeding 10. Therefore, if the viewing angle is on the same side as the projector (backscattering direction), the projection effect is not as good as when viewed from the opposite side of the projector (forward scattering direction) due to the smaller backscattering. This gives it a significant advantage in the field of rear-projection transparent displays.

[0058] To demonstrate the display effect, the present invention has processed a flat and transparent display film using the above-described preparation process. Further testing of the display effect with a projector revealed that, during actual observation, a clear image could be seen over a wide viewing angle, compared to... Figure 14-19The calculated viewing angle needs to be wide; therefore, the transparent display screen proposed in this invention has excellent effects in terms of transparency, display brightness, viewing angle width, and color display. It can be said that the optimized structure of this invention can be used to simultaneously improve the viewing angle, contrast, and color display effect of transparent displays in the rear projection direction.

[0059] This embodiment does not impose any limitation on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A fabrication process for a transparent display screen based on triple strong directional scattering by dielectric particles, characterized in that: Includes the following steps: (1) Put the transparent matrix material and the medium sphere particles into the mixer and mix them; (2) Place the mixed material in a drying oven to dry and remove moisture; (3) Place the well-mixed and dried material into the casting machine for film stretching, ensuring that the thickness of the stretched film does not exceed 0.1 mm; The dielectric spheres are made of SiC material, and a suitable radius of 175 nm was selected based on Mie scattering theory to achieve a forward scattering peak wavelength of [missing value]. λ =454nm, ensuring that the forward scattering efficiency is greater than 10 in the range of -30° to +30° angle with the direction perpendicular to the transparent display; achieving a forward scattering peak wavelength of 454nm in the green light band. λ =532nm, which makes the forward scattering efficiency greater than 10 in the range of -30° to +30° with the direction perpendicular to the transparent display screen; the forward scattering peak wavelength of the red light band is λ=640nm, which makes the forward scattering efficiency greater than 10 in the range of -40° to +40° with the direction perpendicular to the transparent display screen. The dielectric spheres are made of TiO2 material with a radius of 175nm. They can achieve a forward scattering peak wavelength of λ=450nm in the blue light band, which concentrates most of the light in the forward scattering direction within the range of -30° to +30° with respect to the direction perpendicular to the transparent display screen; a forward scattering peak wavelength of λ=532nm in the green light band, which concentrates most of the light in the forward scattering direction within the range of -30° to +30° with respect to the direction perpendicular to the transparent display screen; and a forward scattering peak wavelength of λ=640nm in the red light band, which concentrates most of the light in the forward scattering direction within the range of -40° to +40° with respect to the direction perpendicular to the transparent display screen.

2. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 1, characterized in that: The transparent matrix material uses transparent organic materials such as PVA (polyvinyl alcohol), PET (polyterephthalic acid plastic), and PETG / PMMA (transparent plastic / polymethyl methacrylate).

3. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 1 or 2, characterized in that: The dielectric spheres are one or more materials such as SiC, TiO2, or other materials with similar dielectric constant properties.

4. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 3, characterized in that: When mixing materials using a mixer in step (1), the mass ratio of the medium particles to the transparent matrix material is 1:4000 to 1:

500. The mass ratio can be adjusted according to different scenario requirements. The mixing time is not less than 2 hours.

5. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 3, characterized in that: In step (2), the drying temperature of the drying oven shall not exceed the melting point of the transparent organic material, and the drying time shall not be less than 2 hours.

6. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 3, characterized in that: In step (3), the temperature of the casting machine during the film stretching process should be about 30°C higher than the melting point of the transparent organic material, and the film thickness should not exceed 0.1mm.

7. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 3, characterized in that: When designing and optimizing dielectric spheres, the dielectric constant of the dielectric material is derived from experimental data; it also satisfies the requirement of supporting triple strong directional scattering in the red, green, and blue light bands to improve the performance of color transparent displays; the dielectric constant of SiC is derived from experimental data [S. Singh, JR Potopowicz, LG Van Uitert and SH Wemple. Nonlinear optical properties of hexagonal silicon carbide, Appl. Phys. Lett. 19, 53(1971)], and the dielectric constant of TiO2 is derived from experimental data [JR Devore. Refractive indices of rutile and sphalerite, J. Opt. Soc. Am. 41, 416-419 (1951)].

8. The transparent display fabrication process based on triple strong directional scattering of dielectric particles according to claim 3, characterized in that: The transparent display screen has an adhesive layer on one side, a release film on the surface of the adhesive layer, and a scratch-resistant film on the surface of the release film. The connection between the transparent display film and the adhesive layer is achieved by hot melt adhesive spraying and extrusion coating using a coating and composite equipment.

Images