Air ionization display device and control method thereof

Abstract

To provide an air ionization display apparatus and a control method therefor, which relate to the field of imaging technologies.SOLUTION: A control method of an air ionization display apparatus includes the steps of: splitting, by a pulse laser light source, an output pulse laser beam into a first sub-beam and a second sub-beam; regulating, by a pulse laser regulation assembly, the second sub-beam to obtain a third sub-beam, and regulating a time difference from the first sub-beam to delay an emission of the third sub-beam; combining the first sub-beam and the third sub-beam to obtain a combined beam; converging, by a light field adjustment and control assembly, the combined beam, and ionizing the air at a display region to form a holographic image; and obtaining luminance information of the holographic image and controlling the pulse laser regulation assembly and the light field adjustment and control assembly so that the luminance of the holographic image satisfies a predetermined condition.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present disclosure relates to the technical field of imaging, and more particularly to an air ionization display device and a control method thereof.

Background Art

[0002] An air ionization imaging system converges a beam with a lens and ionizes air at the focal point of the lens to form a light spot during the imaging process. Since the optical power threshold per unit area of the pulse required for air ionization is high, the number of focal points formed by a spatial light modulator that modulates the light field at each ionization point is limited by the pulse power, that is, the number of pixels of the displayed image is restricted by the magnitude of the pulse power. In order to increase the number of pixels of the displayed image, it is necessary to further increase the output pulse power of the light source. However, in the prior art, it is difficult to significantly increase the output pulse power of the light source.

[0003] In addition, in an air ionization display system, the damage threshold of optical components such as zoom lenses is limited. Usually, optical components are difficult to withstand the long-term action of a pulsed laser with a high peak power density. As a result, there is an upper limit to the output pulse power of the light source. Due to such factors, the image area displayed by air ionization is small and cannot meet the needs of large image air imaging display.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to some extent. For this reason, the first object of the present disclosure is to provide an air ionization display device that can achieve a wide range of air ionization with a relatively low output power of a laser light source.

[0005] The second object of the present disclosure is to provide a control method for an air ionization display device.

[0006] To achieve the above objective, an embodiment of the first aspect of the present disclosure provides an air ionization display device, the air ionization display device comprising: a pulsed laser light source that generates a pulsed laser beam; a beam splitter that divides the pulsed laser beam into a first subbeam and a second subbeam; a pulsed laser adjustment assembly that adjusts the wavelength of the second subbeam to obtain a third subbeam and adjusts the time difference between the third subbeam and the first subbeam to delay the emission of the third subbeam; a beam combiner that combines the first subbeam and the delayed emitted third subbeam to obtain a composite beam; and a light field adjustment control assembly that adjusts and focuses the composite beam to ionize air in a display area and form a holographic image.

[0007] To achieve the above objectives, embodiments of a second aspect of the present disclosure provide a control method for an air ionization display device, the method being applied to the above air ionization display device, the method comprising: outputting a pulsed laser beam from the pulsed laser light source; splitting the pulsed laser beam into a first subbeam and a second subbeam using the beam splitter; adjusting the wavelength of the second subbeam using the pulsed laser adjustment assembly to obtain a third subbeam and adjusting the time difference between the third subbeam and the first subbeam to delay the emission of the third subbeam; combining the first subbeam and the delayed emitted third subbeam using the beam combiner to obtain a composite beam; adjusting and focusing the composite beam using the light field adjustment control assembly to ionize air in a display area and form a hologram image; and acquiring brightness information of the hologram image and controlling the pulsed laser adjustment assembly and the light field adjustment control assembly based on the brightness information of the hologram image so that the brightness of the hologram image satisfies predetermined conditions.

[0008] In the air ionization display device and control method according to the embodiments of the present disclosure, a pulsed laser light source generates a pulsed laser beam, a beam splitter then splits the pulsed laser beam into a first sub-beam and a second sub-beam, a pulsed laser adjustment assembly adjusts the wavelength of the second sub-beam to obtain a third sub-beam and adjusts the time difference between the third sub-beam and the first sub-beam to delay the emission of the third sub-beam, a beam combiner combines the first sub-beam and the second sub-beam to obtain a composite beam, and a light field adjustment control assembly adjusts and focuses the composite beam to ionize the air in the display area and form a hologram image. This makes it possible to achieve wide-area air ionization with relatively low output power of the laser light source.

[0009] Additional aspects and advantages of the Disclosure will be given at least in part in the following description, or will become apparent at least in part from the following description, or will be understood through the practice of embodiments of the Disclosure. [Brief explanation of the drawing]

[0010] [Figure 1] This is a block diagram showing the structure of an air ionizer according to one embodiment of the present disclosure. [Figure 2] This is a block diagram showing the structure of an air ionization device according to another embodiment of the present disclosure. [Figure 3] This is a block diagram showing the structure of an air ionization display device according to yet another embodiment of the present disclosure. [Figure 4] This is a schematic diagram showing the structure of an optical delay line in an example of the present disclosure. [Figure 5] This is a schematic diagram illustrating the structure of an optical delay line in another example of the present disclosure. [Figure 6] This is a schematic diagram showing the structure of a light field adjustment control assembly in a first example of the present disclosure. [Figure 7] This is a schematic diagram showing the structure of a light field adjustment control assembly in a second example of the present disclosure. [Figure 8] This is a schematic diagram showing the structure of a light field adjustment control assembly in a third example of the present disclosure. [Figure 9] This is a schematic diagram showing the structure of a light field adjustment control assembly in a fourth example of the present disclosure. [Figure 10] This is a schematic diagram showing the structure of a light field adjustment control assembly in a fifth example of the present disclosure. [Figure 11] This is a flowchart of the operation of an air ionization display device according to one embodiment of the present disclosure. [Figure 12] This is a flowchart of a control method for an air ionization display device according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] Embodiments of the present disclosure will be described in detail below with reference to the examples shown in the attached drawings, where identical or similar components or components having identical or similar functions are denoted by the same or similar reference numerals. The embodiments described below with reference to the drawings are for illustrative purposes only, used to illustrate the present disclosure, and should not be understood as limiting the present disclosure.

[0012] Hereinafter, an air ionization display device and its control method according to the embodiments of this disclosure will be described with reference to the drawings.

[0013] Figure 1 is a block diagram showing the structure of an air ionization display device according to one embodiment of the present disclosure.

[0014] As shown in Figure 1, the air ionization display device 10 includes a pulsed laser light source 11, a beam splitter 12, a pulsed laser adjustment assembly 13, a beam combiner 14, and a light field adjustment control assembly 15.

[0015] Specifically, the pulsed laser light source 11 is used to generate a pulsed laser beam, the beam splitter 12 is used to split the pulsed laser beam into a first sub-beam and a second sub-beam, the pulsed laser adjustment assembly 13 is used to adjust the wavelength of the second sub-beam to obtain a third sub-beam and to adjust the time difference between the third sub-beam and the first sub-beam to delay the emission of the third sub-beam, the beam combiner 14 is used to combine the first sub-beam and the third sub-beam emitted with a delay to obtain a combined beam, and the light field adjustment control assembly 15 is used to adjust and focus the combined beam to ionize the air in the display area to form a hologram image.

[0016] Here, the pulsed laser beam generated from the pulsed laser light source 11 may have a pulse width of 50 fs to 100 ns, a pulse energy of 20 μJ to 10 mJ, a repetition frequency of 500 Hz to 10 MHz, and a wavelength of 1000 nm to 1200 nm. After the pulsed laser light source 11 generates a pulsed laser beam, the pulsed laser beam is split into a first sub-beam and a second sub-beam via the beam splitter 12.

[0017] Furthermore, after splitting the pulsed laser beam into a first sub-beam and a second sub-beam via the beam splitter 12, the first sub-beam reaches the beam combiner 14 via the beam splitter 12, and the second sub-beam reaches the pulsed laser adjustment assembly 13 via the beam splitter 12.

[0018] The first sub-beam reaches the light field adjustment control assembly 15 via the beam combiner 14. The light field adjustment control assembly 15 adjusts and focuses the first sub-beam, and the first sub-beam excites the molecules or atoms in the air in the display area to the first excited state. Since the ionization potential range of most molecules or atoms is between 5 and 20 eV, as can be seen from E = hλ / c, the wavelength range of single-photon ionization is 62 to 248 nm. That is, ordinary single ultraviolet photons or visible light band photons cannot ionize the atoms and molecules in the air. Therefore, the first sub-beam excites the atoms or molecules in the air in the display area to a low first excited state.

[0019] The pulse laser adjustment assembly 13 adjusts the second sub-beam to obtain a third sub-beam. The wavelength of the third sub-beam may be 800 nm to 2000 nm, and the repetition frequency of the third sub-beam is the same as that of the second sub-beam. Further, the pulse laser adjustment assembly 13 delays and outputs the third sub-beam to the beam combiner 14. The third sub-beam reaches the light field adjustment control assembly 15 via the beam combiner 14, and the light field adjustment control assembly 15 adjusts and focuses the third sub-beam. Since the first sub-beam has already excited the air in the display area to the first excited state, the third sub-beam re-excites the atoms or molecules in the air that have already been excited to the low first excited state, thereby ionizing the air.

[0020] Specifically, the number of ionized atoms has the following relationship with the optical flow density of the combined beam, the wavelength of the first sub-beam, and the wavelength of the third sub-beam.

Number

Number

Number

[0021] Here, N0(t) is the total number of atoms, N1(t) is the number of atoms in the first excited state, and σ A This is the stimulated absorption cross-section from the ground state to the first excited state, σ i is the ionization cross-section from the first excited state to the continuous state, τ1 is the spontaneous emission lifetime of the first excited state, Φ is the optical flow density of the combined beam, and the above N i (t) is the number of ionized atoms. The above σ A This relates to the wavelength of the first subbeam, and the above σ i This relates to the wavelength of the third subbeam.

[0022] By adding equations (1) and (2) above, and differentiating equation (3), we can obtain the following:

number

number

number

number

number

number

number

number

[0023] This allows the delay time of the third subbeam to be adjusted so that the third subbeam re-excites atoms or molecules in the air at an appropriate timing after the first subbeam has excited them to the first excited state. Furthermore, by adjusting the wavelength of the third subbeam, the third subbeam can be resonantly excited to atoms or molecules in the first excited state, thereby lowering the threshold of the output power required for the laser to ionize air, and enabling wide-range air ionization even with low output power from the laser source.

[0024] Furthermore, the extinction ratio Tp:Ts > 1000:1 for the beam splitter 12 and the beam combiner 14 can be set to Tp:Ts > 1000:1, and the light field adjustment control assembly 15 can be controlled so that the scanning range of the combined beam is 100-200 mm in the X direction, 100-200 mm in the Y direction, and 100-200 mm in the Z direction. The display area is preferably a three-dimensional display area and is larger than the scanning range of the combined beam.

[0025] Furthermore, please refer to Figure 2. The air ionization display device 10 further comprises a controller 16 and a half-wave plate 17, the controller 16 being connected to a pulsed laser light source 11, a pulsed laser adjustment assembly 13 and a light field adjustment control assembly 15.

[0026] Specifically, the controller 16 controls the display of the hologram image in the display area by controlling the laser output from the pulsed laser light source 11, the pulsed laser adjustment assembly 13, and the light field adjustment control assembly 15 based on the brightness information of the hologram image.

[0027] The half-wave plate 17 is used to adjust the polarization of the pulsed laser beam output from the pulsed laser light source 11. The pulsed laser beam generated from the pulsed laser light source 11 becomes horizontally polarized and vertically polarized after passing through the half-wave plate 17, and the polarization can be further filtered using the beam splitter 12 and beam combiner 14. For example, the reflectance for horizontal polarization by the beam splitter 12 may be set to 0.5% to 1%, and the reflectance for vertical polarization by the beam combiner 14 may be set to 99% to 99.5%, so that the combined beam is approximately horizontally polarized. The size of the half-wave plate 17 may be 20 mm to 30 mm.

[0028] Furthermore, please refer to Figure 3. The pulse laser adjustment assembly 13 described above includes a pulse laser regulator 131 and an optical delay line 132.

[0029] Specifically, the pulsed laser regulator 131 is used to adjust the wavelength of the second sub-beam to obtain a third sub-beam. For example, the second sub-beam acts as an excitation source for the pulsed laser regulator 131, exciting the laser working material in the pulsed laser regulator 131, causing the pulsed laser adjustment assembly 13 to generate the third sub-beam. Alternatively, the wavelength of the second sub-beam can be changed by passing it through a pre-set medium.

[0030] Furthermore, the optical delay line 132 is used to adjust the time difference between the third sub-beam and the first sub-beam, thereby delaying the emission of the third sub-beam.

[0031] Please refer to Figure 4. The optical delay line 132 comprises a corner cube reflector 1321 and an electric linear stage 1322. The corner cube reflector 1321 comprises two mutually orthogonal total reflection mirrors and is used to reflect the third sub-beam emitted from the pulse laser regulator 131 to the beam combiner 14. The electric linear stage 1322 is used to drive the corner cube reflector 1321 and move it in the incident direction of the third sub-beam. The accuracy of the electric linear stage 1322 may be 1µm to 10µm.

[0032] Refer to Figure 5 for options. The optical delay line 132 further comprises a first corner cube reflector 1323, a second corner cube reflector 1324, a first reflector 1325, and a second reflector 1326, and may further comprise an electric linear stage 1322. Both the first corner cube reflector 1323 and the second corner cube reflector 1324 comprise two total reflectors, the two total reflectors are perpendicular to each other, and one total reflector of the first corner cube reflector 1323 is positioned opposite one total reflector of the second corner cube reflector 1324. The first reflector 1325 is used to reflect the third sub-beam emitted from the pulse laser regulator 131 to the other total reflector of the first corner cube reflector 1323, and the second reflector 1326 is used to reflect the third sub-beam emitted from the other total reflector of the second corner cube reflector 1324 to the beam combiner 14. The motorized linear stage 1322 is used to drive at least one corner cube reflector to move it in the direction of incidence of the third sub-beam. There may be multiple motorized linear stages 1322, and they correspond one-to-one with the corner cube reflectors. The accuracy of the motorized linear stage 1322 may be 1um to 10um.

[0033] The time difference between the third sub-beam and the first sub-beam may be 100 fs to 10 ns, and preferably 1 ps.

[0034] Furthermore, please refer to Figure 6. The light field adjustment control assembly 15 described above comprises an adjustment unit 151, a focus unit 152, and a zoom unit 153.

[0035] Specifically, the adjustment unit 151 is used to adjust the direction of the composite beam, the focus unit 152 is used to focus the composite beam, after its direction has been adjusted, in the display area and ionize the air at the focal point to form an image, and the zoom unit 153 is installed between the galvanometer scanner unit and the focus unit 152 and is used to adjust the divergence angle of the beam emitted from the galvanometer scanner unit and the depth position of the focal point to display the hologram image.

[0036] Here, the adjustment unit 151 comprises a galvanometer scanner assembly, which includes two sets of mirrors positioned perpendicular to each other; the focus unit 152 includes a flat-field focus lens assembly; and the zoom unit 153 includes a zoom lens assembly. The two sets of mirrors in the galvanometer scanner unit perform horizontal and vertical deflection, respectively, thereby controlling the position of the focal point on the plane. For example, the position of the focal point in the X and Z directions can be adjusted using the galvanometer scanner assembly, and the position of the focal point in the Y direction can be adjusted using the zoom unit 153. Furthermore, the focus unit 152 ionizes the air at the focal point to form an image. This makes it possible to display a hologram image by scanning the display area.

[0037] Selectively, the adjustment unit 151, focus unit 152, and zoom unit 153 may all be interchangeable units, and furthermore, the user can replace each component of the light field adjustment control assembly 15 themselves, thereby allowing the light field adjustment control assembly 15 to better meet the user's own needs.

[0038] For example, please refer to Figure 7. The adjustment unit 151 may include an ultra-high-speed polyhedral rotating mirror assembly. The ultra-high-speed polyhedral rotating mirror assembly includes a high-speed rotatable polyhedral reflector. The zoom unit 153 includes an ultra-high-speed variable mirror assembly, which includes a piezoelectric material driver and a reflective mirror. The ultra-high-speed polyhedral rotating mirror assembly is a high-speed rotatable polyhedral reflector with a light-transmitting hole diameter of 15-20 mm, and since the polyhedral reflector rotates only in one direction when rotating, it can rotate at high speed, and the rotation speed can reach 500-600 m / s. The reflective mirror may consist of multiple small mirrors or may be a single thin reflective surface. This can improve the imaging speed of the light field adjustment control assembly 15.

[0039] Alternatively, see Figure 8. The adjustment unit 151 may include a MEMS (Micro-Electro-Mechanical System) micromirror, which includes a reflective mirror 20, a fixed electrode 21, and a movable electrode 22. The MEMS micromirror can deflect in a specific manner and time series to enter the composite beam in the light field adjustment control assembly 15. The reflective mirror 20 has the characteristics of being small, electrostatically driven, and universally free. The MEMS micromirror has the advantages of high scanning frequency, small size, and low cost, and can improve the imaging speed of the light field adjustment control assembly 15. The scanning frequency of the MEMS micromirror can typically reach 500 to 1000 Hz.

[0040] Alternatively, see Figure 9. The adjustment unit 151 may include a liquid crystal optical phased array, which includes a liquid crystal molecular layer 26. The liquid crystal optical phased array can deflect the direction of the composite beam entering the light field adjustment control assembly 15 by adjusting the orientation of the liquid crystal molecular layer 26. The liquid crystal optical phased array has characteristics such as a low driving voltage, a fast deflection speed, and is easily coupled with a microelectronic control circuit. In Figure 9, 24 is the composite beam, and 25 is the adjusted composite beam.

[0041] Alternatively, see Figure 10. The adjustment unit 151 may include a digital microgalvanometer scanner array, which includes a microgalvanometer scanner array mirror 30, for example, a DMD (Digital Micro Mirror Device) chip. The digital microgalvanometer scanner array controls whether the composite beam focuses on the display area by controlling the switches of the microgalvanometer scanner array mirror 30. The resolution of the digital microgalvanometer scanner array can typically reach 1280 × 800, the cell size is 10 to 20 microns, the available wavelength range is 850 to 2000 nm, the optical window transmittance is greater than 93%, and the frame rate reaches 5000 fps. The digital microgalvanometer scanner array can improve the frequency frame of the 3D display and improve the imaging speed of the light field adjustment control assembly 15. In Figure 10, 28 is the composite beam and 29 is the adjusted composite beam.

[0042] In one embodiment of this disclosure, as shown in Figure 11, the air ionization display device 10 can form a hologram image in the display area by the following steps.

[0043] In S111, the higher-end unit outputs a pulsed laser beam with a constant repetition frequency and energy as a test pulse, based on the optical characteristics of the pulsed laser light source.

[0044] In S112, the pulsed laser beam first displays a preliminary test pattern by the light field adjustment control assembly.

[0045] For example, the test pattern described above could be, for instance, a single square.

[0046] In S113, a lower-level unit controls the motorized linear stage to perform delay time tuning, and simultaneously controls the pulse laser regulator to perform wavelength scanning.

[0047] Specifically, the lower-level unit can control the motorized linear stage 1322 to drive the corner cube reflector to move in the incident direction of the third sub-beam and modify the time difference between the third sub-beam and the first sub-beam, and the pulse laser regulator 131 to scan the wavelength and modify the wavelength of the third sub-beam.

[0048] In S114, the light field adjustment control assembly collects the brightness of the test pattern, converts it into an electrical signal, and transmits it to a lower-level unit.

[0049] Specifically, the light field adjustment control assembly 15 displays a test pattern in the display area using a test pulse and further collects the brightness of the test pattern.

[0050] In S115, the lower-end unit adjusts the motorized linear stage and pulse laser regulator to the optimal position based on the brightness of the test pattern. The brightness of the test pattern is highest at this optimal position.

[0051] Here, the optimal position is the time difference between the third sub-beam and the first sub-beam that maximizes the brightness of the test pattern, and the wavelength of the third sub-beam.

[0052] In S116, the higher-level unit controls the pulsed laser light source to output a pulsed laser beam with the maximum repetition frequency and the lowest energy that satisfies the ionization threshold.

[0053] This allows the light field adjustment control assembly 15 to scan the display area using the pulsed laser beam.

[0054] In S117, the lower-level machine controls the light field adjustment control assembly to scan and obtain a three-dimensional display pattern. Here, the higher-level unit may be, for example, a remote control module, and the lower-level unit may be, for example, a field control module. The controller 16 includes the higher-level unit and the lower-level unit.

[0055] This allows for the acquisition of brightness information of the hologram image and the control of the pulse laser adjustment assembly 13 and the light field adjustment control assembly 15 based on the brightness information of the hologram image so that the brightness of the hologram image satisfies predetermined conditions.

[0056] As described above, the air ionization display device according to the embodiment of the present disclosure splits a pulsed laser beam into a first sub-beam and a second sub-beam using a beam splitter, and uses the first sub-beam to excite the air in the display area to a first excited state. The pulsed laser adjustment assembly adjusts the wavelength of the second sub-beam to obtain a third sub-beam and delays the output of the third sub-beam. Furthermore, the third sub-beam is used to ionize the air in the first excited state, thereby ionizing the air in the display area and forming a hologram image. This enables wide-area air ionization with relatively low output power of the laser light source, thereby ensuring the safety of the air ionization display device and reducing the cost of the device. In addition, by forming a hologram image in the display area, the user can directly view a three-dimensional image, improving the user experience.

[0057] Figure 12 is a flowchart of a control method for an air ionization display device according to one embodiment of the present disclosure.

[0058] In this embodiment, the control method for the air ionization display device is used in the air ionization display device of the above embodiment.

[0059] As shown in Figure 12, the control method for the air ionization display device includes the following steps. In S121, a pulsed laser beam is output by a pulsed laser light source, and the pulsed laser beam is split into a first sub-beam and a second sub-beam by a beam splitter. In S122, the pulsed laser adjustment assembly adjusts the wavelength of the second sub-beam to obtain a third sub-beam, and delays the emission of the third sub-beam by adjusting the time difference between the third sub-beam and the first sub-beam. In S123, a beam combiner combines the first sub-beam and the third sub-beam, which is emitted with a delay, to obtain a composite beam. In S124, the light field adjustment control assembly adjusts and focuses the composite beam to ionize the air in the display area and form a holographic image. In S125, brightness information of the hologram image is acquired, and based on the brightness information of the hologram image, the pulse laser adjustment assembly and the light field adjustment control assembly are controlled so that the brightness of the hologram image satisfies predetermined conditions.

[0060] Selectively, after controlling the pulsed laser adjustment assembly and the light field adjustment control assembly based on the brightness information of the hologram image, the pulsed laser light source may be further controlled to output a laser pulse beam with the lowest energy that has the maximum permissible repetition frequency and satisfies the air ionization threshold.

[0061] For other specific embodiments of the control method for the air ionization display device according to the embodiments of this disclosure, please refer to the air ionization display device described above.

[0062] As described above, the control method for the air ionization display device according to the embodiment of the present disclosure divides a pulsed laser beam into a first sub-beam and a second sub-beam, adjusts the wavelength of the second sub-beam to obtain a third sub-beam, adjusts the time difference between the third sub-beam and the first sub-beam to delay the emission of the third sub-beam, and further combines the first sub-beam and the delayed emitted third sub-beam to obtain a composite beam. Using the composite beam, air is ionized in the display area to form a hologram image, and brightness information of the hologram image can be further acquired. Based on the brightness information of the hologram image, the brightness of the hologram image is controlled to satisfy predetermined conditions. This ensures the safety of the air ionization display device and reduces the cost of the device by achieving wide-area air ionization with relatively low output power of the laser light source. Furthermore, by forming a hologram image in the display area, the user can directly view a three-dimensional image, improving the user experience.

[0063] Furthermore, the logic and / or steps described in the flowchart, or otherwise described herein, can be considered, for example, a fixed sequence list of executable instructions for realizing a logical function, which can be specifically realized on any computer-readable medium and used in an instruction execution system, device or apparatus (a computer-based system, a system including a processor, or a system that can read instructions from an instruction execution system, device or apparatus and execute those instructions), or used in combination with such instruction execution systems, devices or apparatus. For the purposes of this specification, “computer-readable medium” may be any device that contains, stores, communicates, propagates or transmits, and is used in or in combination with an instruction execution system, device or apparatus. More specific examples (a non-exclusive list) of computer-readable medium include electrical connections with one or more wires (electronic devices), portable computer disk cases (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read-only memory (CDROM). Furthermore, the computer-readable medium may be paper or other suitable medium on which the program can be printed, for example, by optically scanning the paper or other medium, then editing, interpreting, or processing it in any other suitable way to obtain the program electronically, and then storing it in computer memory.

[0064] It should be understood that each part of this disclosure can be implemented by hardware, software, firmware, or a combination thereof. In the embodiments described above, a plurality of steps or methods can be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, when implemented by hardware, as in other embodiments, it can be implemented by any or a combination of known technologies in the art, such as discrete logic circuits having logic gate circuits for implementing logic functions for data signals, dedicated integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0065] In this specification, reference terms such as “one embodiment,” “several embodiments,” “one example,” “specific example,” or “several examples” refer to specific features, structures, materials, or characteristics described in combination with such embodiments or examples as being included in at least one embodiment or example of the present invention. In this specification, exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, materials, or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0066] In describing this disclosure, it is important to understand that the orientations or positional relationships indicated by terms such as “center,” “vertical,” “horizontal,” “length,” “width,” “thickness,” “top,” “bottom,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” “outside,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” are the orientations or positional relationships shown in the drawings and are used solely to facilitate and simplify the description of this disclosure. They do not indicate or imply that the devices or elements referred to have a specific orientation or need to be constructed and operated in a specific orientation, and therefore should not be understood as limiting this disclosure.

[0067] The terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance or the number of technical features described. Thus, features defined as “first” and “second” may explicitly or implicitly include at least one of these features. In this disclosure, “multiple” means at least two, for example, two, three, etc., unless otherwise specified.

[0068] In this disclosure, unless otherwise expressly specified and limited, terms such as “attachment,” “connection,” “connection,” and “fixed” should be understood in a broad sense, for example, fixed connection, removable connection, or integrated connection; mechanical connection, electrical connection, or intercommunication; direct connection or indirect connection via an intermediate medium; or internal communication between two elements or interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in this disclosure from the specific case.

[0069] In this disclosure, unless otherwise expressly specified or limited, "above" or "below" a first feature means that the first and second features may be in direct contact or indirectly in contact through an intermediate medium. "Above," "above," or "on the top surface" of a second feature means that the first feature is directly above or diagonally above the second feature, or simply that the level of the first feature is higher than that of the second feature. "Below," "below," or "on the bottom surface" of a second feature means that the first feature is directly below or diagonally below the second feature, or simply that the level of the first feature is lower than that of the second feature.

[0070] Although embodiments of the present disclosure have been shown and described above, these embodiments are illustrative and do not imply any limitations of the present disclosure. Those skilled in the art can modify, alter, substitute, and transform the above embodiments within the scope of the present disclosure.

[0071] This disclosure claims priority to the Chinese patent application filed with the China National Intellectual Property Office on June 22, 2021, with application number 202110693799.7, and the title of the invention "Air Ionization Display Device and Control Method thereof," the entire contents of which are incorporated herein by reference.

Claims

1. A control method for an air ionization display device, The steps include: outputting a pulsed laser beam using a pulsed laser light source, and splitting the pulsed laser beam into a first sub-beam and a second sub-beam using a beam splitter; The pulse laser adjustment assembly is used to adjust the wavelength of the second sub-beam to obtain a third sub-beam, and to adjust the time difference between the third sub-beam and the first sub-beam to delay the emission of the third sub-beam. The steps include: using a beam combiner to combine the first sub-beam and the third sub-beam, which is emitted with a delay, to obtain a combined beam; The steps include adjusting and focusing the composite beam using a light field adjustment control assembly to ionize the air in the display area and form a holographic image, The steps include: acquiring brightness information of the hologram image, and controlling the pulse laser adjustment assembly and the light field adjustment control assembly based on the brightness information of the hologram image so that the brightness of the hologram image satisfies predetermined conditions; A control method for an air ionization display device, including the method described above.

2. After the step of controlling the pulsed laser adjustment assembly and the light field adjustment control assembly based on the brightness information of the hologram image, A step of controlling the pulsed laser light source to output a laser pulse beam with the lowest energy that has the maximum permissible repetition frequency and satisfies the air ionization threshold, A control method for an air ionization display device according to claim 1, further comprising:

Images