Air ionization display device

Abstract

The present invention discloses an air ionization display device, comprising: a plurality of pulse light sources, wherein the pulse power density of the pulse light sources is less than the air ionization threshold and the sum of the pulse power densities of the plurality of pulse light sources is greater than the air ionization threshold, and the light beams generated by the plurality of pulse light sources intersect at a display area and ionize the air to form a holographic real image. The air ionization display device according to an embodiment of the present invention utilizes a plurality of pulse light sources to cooperate to increase the energy of the light beam intersection point, and then can ionize the air at the position of the light beam intersection point to form a holographic real image, which not only reduces the specification requirements for a single pulse light source and greatly reduces the production cost of the air ionization display device, but also reduces the limitation of the lens assembly on the display range by eliminating the lens assembly in the conventional air ionization display device, so that the display range of ionization can be increased.

Description

Technical Field

[0001] The invention relates to the field of air display, and in particular to an air ionization display device. Background Art

[0002] During the imaging process, the air ionization imaging system uses a lens to aggregate the light beam and ionize the air at the focus of the lens to form a light spot. The galvanometer changes the transmission path of the light beam to change the position of the ionized light spot. Due to the limitations of the galvanometer deflection angle and the scanning range of the lens, the air ionization system can only display a small range of images and cannot meet the needs of aerial imaging of larger images. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air ionization display device, which realizes air ionization display by converging multiple light beams and ionizing air, thereby expanding the display range of the air ionization system.

[0004] According to an embodiment of the present invention, the air ionization display device includes: multiple pulse light sources, the pulse energy of the pulse light sources is less than the air ionization threshold and the sum of the pulse energies of the multiple pulse light sources is greater than the air ionization threshold, and the light beams generated by the multiple pulse light sources intersect in the display area and ionize the air to form a holographic real image.

[0005] The air ionization display device according to the embodiment of the present invention utilizes multiple pulse light sources to cooperate to increase the laser energy at the intersection of light beams, thereby ionizing the air at the intersection of light beams to form a holographic real image. This not only reduces the specification requirements of a single pulse light source and greatly reduces the production cost of the air ionization display device, but also eliminates the lens assembly in the conventional air ionization display device, thereby simplifying the structural design of the air ionization display device.

[0006] According to some embodiments of the present invention, the air ionization display device further comprises: a repetition frequency adjustment component, which is disposed between the pulse light source and the display area and is used to adjust the repetition frequency of pulses output by the multiple pulse light sources.

[0007] According to some embodiments of the present invention, the repetition frequency adjustment component includes: a plurality of photodetectors, a frequency reference source and a servo controller, the plurality of photodetectors are arranged one-to-one between the plurality of pulse light sources and the display area for detecting the repetition frequency of pulses output by the pulse light sources, the frequency reference source is used to provide a frequency reference standard, and the servo controller signal connects the photodetectors, the frequency reference source and the pulse light source, and is used to control the repetition frequency of pulses output by the pulse light source according to feedback information from the photodetectors and feedback information from the frequency reference source.

[0008] According to some embodiments of the present invention, a first beam splitter is provided between the pulse light source and the display area, and a plurality of the first beam splitters reflect partial light beams of a plurality of the pulse light sources onto a plurality of the photodetectors in a one-to-one correspondence.

[0009] According to some embodiments of the present invention, the pulse light source includes: a pulse generator and a light field controller, the pulse generator is used to generate a pulse light beam, the light field controller is located between the pulse generator and the display area, the pulse light beam generated by the pulse generator is irradiated on the light field controller and is projected onto the display area after the light field regulation, and the first beam splitter is located between the pulse generator and the light field controller.

[0010] According to some embodiments of the present invention, the pulse light source includes: also includes: a pulse time delay monitor and a time delay line, the pulse time delay monitor is arranged between the multiple pulse light sources and the display area to monitor the pulse delay signal of the pulse light source, the time delay line is arranged between the pulse generator and the light field controller and is connected to the pulse time delay monitor signal, and is used to compensate for the time delay of the pulse output pulse of the pulse light source according to the feedback information of the pulse time delay monitor.

[0011] According to some embodiments of the present invention, the number of the time delay lines is the same as the number of the pulse light sources, and the plurality of the delay lines corresponds one-to-one to the plurality of the pulse light sources.

[0012] According to some embodiments of the present invention, a second beam splitter is provided between the first beam splitter and the photodetector, and the second beam splitter reflects a portion of the light beam generated by the first beam splitter to the pulse time delay monitor.

[0013] According to some embodiments of the present invention, there are multiple second beam splitters, wherein a beam combiner is provided between one of the second beam splitters and the pulse time delay monitor, and reflectors are provided between the remaining second beam splitters and the beam combiner, and the reflectors are used to reflect the light beam projected by the second beam splitter onto the beam combiner.

[0014] According to some embodiments of the present invention, the repetition frequency of the multiple pulse light sources is the same, the pulse width of the pulse light source is 50fs-100ns, the pulse energy of the pulse light source is 20μJ-10mJ, and the repetition frequency of the pulse light source is 500Hz-10MHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic structural diagram of an air ionization display device according to an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a pulse light source according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] 100: air ionization display device;

[0021] 10: pulse light source; 11: pulse generator; 12: light field controller; 13: pulse time delay monitor; 14: time delay line; 15: first pulse light source; 16: second pulse light source;

[0022] 20: repetition frequency adjustment component; 21: multiple photodetectors; 22: frequency reference source; 23: servo controller;

[0023] 30: first beam splitter; 31: second beam splitter; 32: controller; 33: beam combiner; 34: reflector;

[0024] 40: Imaging area. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Reference below Figure 1-Figure 2 An air ionization display device 100 according to an embodiment of the present invention is described.

[0027] The air ionization display device 100 according to an embodiment of the present invention comprises: a plurality of pulse light sources 10, wherein the pulse energy of the pulse light sources 10 is less than the air ionization threshold and the sum of the pulse energies of the plurality of pulse light sources 10 is greater than the air ionization threshold, and most of the light beams generated by the plurality of pulse light sources 10 intersect at a specified position in a display area and ionize the air to form a holographic real image.

[0028] Among them, the pulse power density of each pulse light source 10 is relatively small and less than the air ionization threshold. The single light beam generated by the pulse light source 10 will not cause ionization to the surrounding air during the projection process. Multiple low-power pulse light sources 10 are coordinated to irradiate the same point. The laser power density at the intersection of multiple light beams is superimposed and exceeds the air ionization threshold, thereby ionizing the air at the intersection, thereby forming a holographic real image.

[0029] Therefore, the air ionization display device 100 according to the embodiment of the present invention utilizes multiple pulse light sources 10 to cooperate to increase the laser power density at the intersection of light beams, thereby ionizing the air at the intersection of light beams to form a holographic real image. This not only reduces the specification requirements for a single pulse light source 10 and greatly reduces the production cost of the air ionization display device 100, but also eliminates the lens assembly in the conventional air ionization display device 100, and simplifies the structural design of the air ionization display device 100.

[0030] like Figure 1 As shown, in some specific embodiments, the air ionization display device 100 further includes a repetition frequency adjustment component 20, which is disposed between the pulse light source 10 and the display area and is used to adjust the repetition frequency of the multiple pulse light sources 10. The repetition frequency adjustment component 20 is connected to the multiple pulse light sources 10 by signal, and can receive the repetition frequency signal of the light beams projected by the multiple pulse light sources 10, and then adjust the pulse light sources 10 according to the received repetition frequency signal.

[0031] The repetition frequency of the pulse light source 10 refers to the number of trigger pulses generated per second by the pulse light source 10. The repetition frequency adjustment component 20 can adjust the pulse repetition frequency of multiple light beams emitted by multiple pulse light sources 10. The repetition frequency adjustment component 20 adjusts the time position of the pulse in combination with the time delay line 14 so that each pulse overlaps in time at the intersection of the light beams.

[0032] The pulse time delay monitor 13 is arranged between the multiple pulse light sources 10 and the display area to monitor the pulse delay signal of the pulse light source 10. The pulse time delay monitor 13 inputs the monitored pulse delay signal to the controller 32, and the controller 32 then drives the time delay line 14 to control the time delay of the multiple pulses generated by the multiple pulse light sources 10 so that the multiple pulses are finally projected synchronously to the display area.

[0033] The time delay line 14 is provided between the pulse generator 11 and the light field controller 12 and is signal-connected to the pulse time delay monitor 13 , and is used to compensate the pulse delay of the output light beam of the pulse light source 10 according to the feedback information of the pulse time delay monitor 13 .

[0034] According to the air ionization display device 100 of the embodiment of the present invention, the repetition frequency adjustment component 20 includes: a photodetector 21 , a frequency reference source 22 and a servo controller 23 .

[0035] The photodetector 21 may be multiple and the number is the same as the number of the pulse light source 10. As shown in the figure, in this embodiment, there are two pulse light sources 10 and two photodetectors 21. The two pulse light sources 10 are respectively the first pulse light source 15 and the second pulse light source 16; the two photodetectors are respectively the first photodetector and the second photodetector. The first photodetector is correspondingly arranged between the first pulse light source 15 and the beam combiner 33 to detect the repetition frequency of the light beam output by the first pulse light source 15, and the second photodetector is correspondingly arranged between the second pulse light source 16 and the beam combiner 33 to detect the repetition frequency of the light beam output by the second pulse light source 16.

[0036] The servo controller 23 signal connects the photodetector 21, the frequency reference source 22 and the pulse light source 10. The frequency reference source 22 is used to provide a frequency reference standard for the servo controller 23. The frequency standard parameters of the required frequency are set in advance in the frequency reference source 22. After starting the device, the frequency parameters output by the frequency reference source 22 are used as the frequency standard for reference by the servo controller 23.

[0037] The servo controller 23 is connected to the first photodetector, the frequency reference source 22, the first pulse light source 15, the second photodetector and the second pulse light source 16. When the light beam is irradiated on the photodetector 21 corresponding to the pulse light source 10, feedback information will be generated. The servo controller 23 controls the pulse light source 10 according to the feedback information of the photodetector 21 and the frequency standard signal given by the frequency reference source 22, thereby controlling the repetition frequency of its output pulses.

[0038] Specifically, after the servo controller 23 receives the repetition frequency parameters of the light beam emitted by the first pulse light source 15 fed back by the first photodetector, it compares them with the frequency parameters provided by the frequency reference source 22. If the output light beam of the first pulse light source 15 does not meet the parameter requirements, the first pulse light source 15 is adjusted until the output light beam of the first pulse light source 15 meets the requirements; similarly, the servo controller 23 adjusts the repetition frequency parameters of the output light beam of the second pulse light source 16 according to the frequency reference source 22 and the second photodetector.

[0039] A first beam splitter 30 is provided between the pulse light source 10 and the display area, and the plurality of first beam splitters 30 reflect part of the light beams of the plurality of pulse light sources 10 to the plurality of photodetectors 21 one by one. The first beam splitter 30 reflects part of the light beam of the first pulse light source 15 to the first photodetector correspondingly. The light beam generated by the first pulse light source 15 will be divided into two light beams through the first beam splitter 30, one light beam is projected onto the first photodetector for detecting the repetition frequency of the light beam generated by the first pulse light source 15, and the other light beam is projected onto the display area for ionization imaging; similarly, the light beam generated by the second pulse light source 16 will be divided into two light beams through the first beam splitter 30, one light beam is projected onto the second photodetector for detecting the repetition frequency of the light beam generated by the second pulse light source 16, and the other light beam is projected onto the display area for ionization imaging. The servo controller 23 adjusts the pulse repetition frequency parameters of the first pulse light source 15 and the second pulse light source 16 according to the feedback information of the first photodetector and the second photodetector.

[0040] In some specific embodiments, the transmittance of the beam splitter is A1, 99%≤A1≤99.5%, and the reflectance of the beam splitter is A2, 0.5%≤A2≤1%. The light beam generated by the pulse light source 10 passes through the beam splitter, a part of which is used on the photodetector to detect the frequency parameters, and the other part is used for imaging. When the photodetector detects the repetition frequency parameters of the light beam, a light beam with less energy can complete the repetition frequency detection. Therefore, setting the transmittance and reflectance of the first beam splitter 30 within the above range can not only ensure that the photodetector can stably and accurately detect the repetition frequency of the light beam, but also increase the proportion of the pulse energy used for imaging in the total pulse energy, so that most of the light beams pass through the beam splitter for imaging.

[0041] According to some embodiments of the present invention, the pulse light source 10 includes: a pulse generator 11 and a light field regulator 12, the pulse generator 11 is used to generate a pulse light beam, the light field regulator 12 is located between the pulse generator 11 and the display area, the pulse light beam generated by the pulse generator 11 is irradiated on the light field regulator 12 and is projected onto the display area after light field regulation, and the first beam splitter 30 is located between the pulse generator 11 and the light field regulator 12.

[0042] The light beam generated by the pulse generator 11 passes through the light field controller 12, and the light field controller 12 controls the light beam generated by the pulse generator 11, thereby controlling the direction of the light beam. In this way, the light beams generated by multiple pulse generators 11 can be controlled to intersect in the imaging area 40, and ionize the air at the intersection point to form a real image, so as to form a holographic real image at a specific position as needed.

[0043] The first beam splitter 30 is arranged between the pulse generator 11 and the light field regulator 12. Since the direction of the light beam emitted by the pulse generator 11 to the light field regulator 12 is fixed, it is convenient for the first beam splitter 30 to separate the light beam, prevent the projection direction of the light beam from swinging and affecting the splitting effect, and ensure that the photodetector 21 can always detect the light beam.

[0044] According to some embodiments of the present invention, the pulse light source 10 includes: also includes: a pulse time delay monitor 13 and a time delay line 14. The pulse time delay monitor 13 is arranged between the multiple pulse light sources 10 and the display area to monitor the output pulse delay signal of the pulse light source 10. The pulse time delay monitor 13 inputs the monitored pulse delay signal to the controller 32 and then drives the time delay line 14 to control the time delay of the multiple pulses generated by the multiple pulse light sources 10 so that the multiple pulses are synchronously projected to the display area.

[0045] The time delay line 14 is provided between the pulse generator 11 and the light field controller 12 and is signal-connected to the pulse time delay monitor 13 , and is used to compensate the pulse delay of the output light beam of the pulse light source 10 according to the feedback information of the pulse time delay monitor 13 .

[0046] By setting the pulse time delay monitor 13 and the time delay line 14, the output pulse delay information of the pulse light source 10 can be monitored and adjusted, so as to ensure that the pulses generated by the pulse light source 10 are time synchronized at the intersection point, thereby ensuring that the air ionization display device 100 completes aerial imaging.

[0047] According to some embodiments of the present invention, the number of time delay lines 14 is the same as the number of pulse light sources 10, and multiple delay lines correspond to multiple pulse light sources 10 one by one. By setting multiple time delay lines 14, time compensation is performed on the output pulses of the corresponding pulse light sources 10 to prevent the pulses generated by the pulse light sources 10 from failing to reach the ionization threshold and failing to ionize due to inconsistent time delays.

[0048] like Figure 1As shown, according to some embodiments of the present invention, a second beam splitter 31 is provided between the first beam splitter 30 and the photodetector 21, and the second beam splitter 31 reflects part of the reflected light beam of the first beam splitter 30 to the pulse time delay monitor 13. That is, the light beam generated by the pulse light source 10 first passes through the first beam splitter 30, a part of the light beam is projected into the imaging area 40 through the first beam splitter 30 for imaging, and another part of the light beam is irradiated to the photodetector 21. The light beam irradiated to the photodetector 21 passes through the second beam splitter 31, a part of it is irradiated to the photodetector 21 for detecting the pulse repetition frequency signal, and another part of it is irradiated to the pulse time delay monitor 13 for monitoring the time delay information of the pulse. In this way, various parameters of the pulse light source 10 can be accurately detected.

[0049] According to some embodiments of the present invention, there are multiple second beam splitters 31, wherein a beam combiner 33 is provided between one of the second beam splitters 31 and the pulse time delay monitor 13, and a reflector 34 is provided between the remaining second beam splitters 31 and the beam combiner 33, and the reflector 34 is used to reflect the light beam reflected by the second beam splitter 31 onto the beam combiner 33.

[0050] like Figure 1 As shown, there are two second beam splitters 31, namely a front second beam splitter 31 and a rear second beam splitter 31. A beam combiner 33 is provided between the front second beam splitter 31 and the pulse time delay monitor 13, and a reflector 34 is provided between the rear second beam splitter 31 and the beam combiner 33. The reflector 34 is used to irradiate the light beam separated by the rear second beam splitter 31 onto the beam combiner 33. The beam combiner 33 combines the light beams separated by the front second beam splitter 31 and the rear second beam splitter 31 and emits them to the pulse time delay monitor 13.

[0051] In some specific embodiments, there may be three second beam splitters 31, namely a front second beam splitter, a middle second beam splitter and a rear second beam splitter, and there may be two reflectors 34, namely a first reflector and a second reflector. A beam combining mirror 33 is provided between the front second beam splitter and the pulse time delay monitor 13, a first reflector is provided between the middle second beam splitter and the beam combining mirror 33, the first reflector is used to irradiate the light beam separated by the middle second beam splitter onto the beam combining mirror 33, a second reflector is provided between the rear second beam splitter and the beam combining mirror 33, the second reflector is used to irradiate the light beam separated by the rear second beam splitter onto the beam combining mirror 33, and the beam combining mirror 33 combines the light beams separated by the front second beam splitter 31, the middle second beam splitter 31 and the rear second beam splitter 31 and irradiates them to the pulse time delay monitor 13.

[0052] By providing the beam combiner 33 and the reflector 34 , one pulse time delay monitor 13 can be used to monitor the delay information of multiple light beams, thereby improving the working efficiency of the pulse time delay monitor 13 and simplifying the structural design of the air ionization display device 100 .

[0053] In this embodiment, the repetition frequency of multiple pulse light sources 10 is the same, the pulse width of the pulse light source 10 is 50fs-100ns, the pulse energy of the pulse light source 10 is 20μJ-10mJ, and the repetition frequency of the pulse light source 10 is 500Hz-10MHz, thereby improving the imaging effect and pixels of the holographic real image.

[0054] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0055] In the description of the present invention, "plurality" means two or more.

[0056] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0057] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0059] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air ionization display device (100), characterized in that: include: A plurality of pulse light sources (10), wherein the pulse energy of the pulse light sources (10) is less than an air ionization threshold and the sum of the pulse energies of the plurality of pulse light sources (10) is greater than the air ionization threshold, and the light beams generated by the plurality of pulse light sources (10) intersect at a display area and ionize the air to form a holographic real image; a repetition frequency adjustment component (20), the repetition frequency adjustment component (20) being arranged between the pulse light source (10) and the display area and being used for adjusting the repetition frequency of the plurality of pulse light sources (10); The repetition frequency adjustment component (20) comprises: a plurality of photodetectors (21), the plurality of photodetectors (21) being arranged one-to-one in correspondence between the plurality of pulse light sources (10) and the display area and used for detecting the repetition frequency of the pulse light sources (10); A frequency reference source (22), the frequency reference source (22) being used to provide a frequency reference standard; A servo controller (23), the servo controller (23) being signal-connected to the photodetector (21), the frequency reference source (22) and the pulse light source (10), and being used for controlling the output pulse repetition frequency of the pulse light source (10) according to feedback information of the photodetector (21) and feedback information of the frequency reference source (22); A first beam splitter (30) is provided between the pulse light source (10) and the display area, and a plurality of the first beam splitters (30) reflect partial light beams of a plurality of the pulse light sources (10) onto a plurality of the photodetectors (21) in a one-to-one correspondence; The transmittance of the plurality of first beam splitters (30) is A1, 99%≤A1≤99.5%, and the reflectivity of the plurality of beam splitters (30) is A2, 0.5%≤A2≤1%.

2. The air ionization display device (100) according to claim 1, characterized in that: The pulse light source (10) comprises: A pulse generator (11), the pulse generator (11) being used to generate a pulsed light beam; A light field controller (12), the light field controller (12) being located between the pulse generator (11) and the display area, the pulse light beam generated by the pulse generator (11) irradiating the light field controller (12) and being projected onto the display area after light field regulation, the first beam splitter (30) being located between the pulse generator (11) and the light field controller (12).

3. The air ionization display device (100) according to claim 2, characterized in that: Also includes: A pulse time delay monitor (13), the pulse time delay monitor (13) being arranged between the plurality of pulse light sources (10) and the display area and being used for monitoring a pulse delay signal of the pulse light source (10); A time delay line (14), the time delay line (14) being arranged between the pulse generator (11) and the light field controller (12) and being connected to the pulse time delay monitor (13) signal, and being used to compensate for the pulse delay of the light beam emitted by the pulse light source (10) according to feedback information from the pulse time delay monitor (13).

4. The air ionization display device (100) according to claim 3, characterized in that: The number of the time delay lines (14) is the same as the number of the pulse light sources (10), and a plurality of the time delay lines corresponds one to one to a plurality of the pulse light sources (10).

5. The air ionization display device (100) according to claim 4, characterized in that: A second beam splitter (31) is provided between the first beam splitter (30) and the photodetector, and the second beam splitter (31) reflects part of the reflected light beam of the first beam splitter (30) to the pulse time delay monitor (13).

6. The air ionization display device (100) according to claim 5, characterized in that: There are a plurality of second beam splitters (31), a beam combiner (33) being provided between one of the second beam splitters (31) and the pulse time delay monitor (13), and a reflector (34) being provided between the remaining second beam splitters (31) and the beam combiner (33), the reflector (34) being used to reflect the light beam projected by the second beam splitter (31) onto the beam combiner (33).

7. The air ionization display device (100) according to any one of claims 1 to 6, characterized in that: The repetition frequency of the plurality of pulse light sources (10) is the same, the pulse width of the pulse light source (10) is 50 fs-100 ns, the pulse energy of the pulse light source (10) is 20 μJ-10 mJ, and the repetition frequency of the pulse light source (10) is 500 Hz-10 MHz.

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