Non-contact holographic control panel and holographic display device

Abstract

The invention discloses a non-contact holographic control panel and a holographic display device. The non-contact holographic control panel comprises a shell; the shell is provided with an opening which is arranged towards human eyes; the light source is arranged in the shell; the infrared sensing device is arranged on the shell and located at the opening, so that a holographic sensing area is formed in the opening; the holographic image plate is located on the side, away from the opening, of the light source and used for receiving light emitted by the light source so as to display a virtual control panel image in a holographic induction area; the holographic image plate is obtained by exposing a holographic dry plate through an exposure device. According to the invention, through cooperation of the light source and the holographic image plate, display of the control panel image is carried out in the holographic sensing area, so that a user can carry out key control by clicking in the virtual holographic sensing area with a finger; meanwhile, the light source is built in, so that the control panel can form an independent module and can be flexibly installed in terminal equipment, the system integration rate is improved, the structure is compact, the size is reduced, installation is convenient, and the application range of the holographic keyboard is expanded.

Description

Technical Field

[0001] The present application relates to the field of holographic display technology, and in particular to a non-contact holographic control panel and a holographic display device. Background Art

[0002] The control panels of existing equipment include touch control panels and mechanical keyboard control panels. Regardless of the control method used, users are required to directly contact the control panel. Control panels in public places, such as elevator buttons and self-service machines, are frequently touched by multiple people, which can easily lead to the spread of pathogens and cause health and safety issues. On the other hand, frequent pressing and contact can also cause surface wear and cracking, blurred writing, and other problems, affecting usage.

[0003] Existing technologies utilize holographic technology to create contactless holographic keyboards, enabling contactless operation by the user touching a virtual area. However, these require an external light source to create a holographic contactless keyboard. This requires an additional light source, making it impossible to integrate the holographic keyboard system as a standalone module into the target device. This results in a larger overall size and inconvenient installation, limiting its application in portable devices or those with high space requirements.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a non-contact holographic control panel and a holographic display device in response to the above-mentioned defects of the prior art, aiming to solve the problem in the prior art that the light source is external and cannot form an independent application module, resulting in large size and inconvenient installation and use.

[0006] The technical solutions adopted by this application to solve the technical problems are as follows:

[0007] A non-contact holographic control panel, comprising:

[0008] The housing has an opening, and the opening is arranged toward the human eye;

[0009] a light source, disposed in the housing;

[0010] an infrared sensing device, disposed on the housing and located at the opening to form a holographic sensing area within the opening;

[0011] The holographic image plate is located on the side of the light source away from the opening and is used to receive the light emitted by the light source to display a virtual control panel image in the holographic sensing area; the holographic image plate is obtained by exposing a holographic dry plate through an exposure device.

[0012] For the non-contact holographic control panel, wherein the infrared sensing device includes at least one infrared sensing unit, the infrared sensing unit includes two infrared sensing modules, and each infrared sensing module includes an infrared emitter and an infrared receiver arranged oppositely; the infrared light directions of the two infrared sensing modules are arranged perpendicular to each other.

[0013] For the non-contact holographic control panel, wherein the holographic image plate includes:

[0014] A transparent substrate layer;

[0015] A holographic material layer, arranged on a side of the transparent substrate layer away from the light source.

[0016] For the non-contact holographic control panel, wherein the exposure device includes:

[0017] An image plate, having a control panel image; the image plate is arranged opposite to and parallel with the holographic dry plate;

[0018] A holographic dry plate, arranged in parallel with the image plate; the holographic dry plate includes a holographic material layer and a transparent substrate layer, and the transparent substrate layer of the holographic dry plate is arranged opposite to the image plate;

[0019] A light source assembly, configured to emit light to the image plate and / or the holographic dry plate, and enable the light irradiated onto the holographic dry plate through the image plate and the light directly irradiated onto the holographic dry plate to be on two sides of the holographic dry plate respectively, so as to perform off-side exposure on the holographic material of the holographic material layer.

[0020] In one embodiment, the light source assembly includes:

[0021] A light emitter, arranged on a side of the holographic material layer of the holographic dry plate and higher than the holographic dry plate, so as to emit light to the holographic dry plate;

[0022] The proximal angle α formed between the light emitter and the proximal end of the holographic dry plate and the distal angle θ formed between the light emitter and the distal end of the holographic dry plate satisfy: 0 < α < θ < 90°.

[0023] In another embodiment, the light source assembly includes:

[0024] A light emitter, configured to emit light;

[0025] An exposure assembly, located between the light emitter and the image plate and the holographic dry plate, so as to emit light to the image plate and the holographic dry plate respectively.

[0026] Furthermore, the exposure assembly includes:

[0027] A spectrometer is located in the light emitting direction of the light emitter and receives the light emitted by the light emitter;

[0028] a first reflecting mirror, located between the beam splitter and the image plate, for reflecting the light emitted by the beam splitter to the image plate;

[0029] The second reflecting mirror is located between the beam splitter and the holographic dry plate and is used to reflect the light emitted from the beam splitter to the holographic dry plate.

[0030] In yet another embodiment, the exposure assembly includes:

[0031] A spectroscope, located in the light emitting direction of the light emitter and receiving the light emitted by the light emitter;

[0032] a first reflecting mirror, located between the beam splitter and the image plate, for reflecting the light emitted by the beam splitter to the image plate;

[0033] a light guide prism, located on a side of the holographic dry plate facing away from the image plate and attached to the holographic dry plate;

[0034] The second reflecting mirror is located between the beam splitter and the holographic dry plate and is used to reflect the light emitted from the beam splitter to the light guide prism.

[0035] The non-contact holographic control panel, wherein the holographic image plate comprises:

[0036] a coupling-in region, corresponding to the light source, for receiving the light emitted by the light source and coupling the light into the holographic image plate;

[0037] The outcoupling region is located in the light-emitting direction of the coupling-in region and couples the light out of the holographic image plate; the width of the outcoupling region is smaller than the width of the coupling-in region.

[0038] A holographic display device comprises the non-contact holographic control panel as described in any one of the above items.

[0039] Advantageous effects: Through the infrared sensing device, the present application forms the holographic sensing area at the opening, and through the cooperation of the light source and the holographic image plate, the control panel image is displayed in the holographic sensing area, enabling the user to control the machine by clicking in the virtual holographic sensing area with their finger, without the user directly contacting the real control panel. This solves the hygiene hazard problem caused by the contact control panel and also avoids problems such as literal wear, unclear handwriting, and service life caused by contacting the real control panel. At the same time, the light source in the present application is built into the housing, so that while the non-contact holographic control panel can perform holographic key imaging and avoid direct user touch on the keys, the non-contact holographic control panel can form an independent integrated module, and this independent module can be flexibly installed in various terminal devices, improving the system integration efficiency, with a compact structure, reduced volume, convenient installation, and expanding the application range of the holographic keyboard. Description of the Drawings

[0040] Figure 1 FIG. is a schematic diagram of the overall structure of the non-contact holographic control panel based on Embodiment 1 and Embodiment 2 of the present application;

[0041] Figure 2 FIG. is a schematic diagram of the structure of the holographic sensing area in the non-contact holographic control panel of the present application;

[0042] Figure 3 FIG. is a schematic diagram of the structure of the exposure device in Embodiment 1 of the present application;

[0043] Figure 4 FIG. is a schematic diagram of the angular distribution of the light emitter and the holographic dry plate in Embodiment 1 of the present application;

[0044] Figure 5 FIG. is a schematic diagram of the overall structure of the non-contact holographic control panel in the counterexample of Embodiment 1 of the present application;

[0045] Figure 6 FIG. is a schematic diagram of the structure of the exposure device in Embodiment 2 of the present application;

[0046] Figure 7 FIG. is a schematic diagram of the structure of the exposure device in Embodiment 3 of the present application;

[0047] Figure 8 FIG. is a schematic diagram of the distribution of the coupling-in area and the coupling-out area on the holographic dry plate in Embodiment 3 of the present application;

[0048] Figure 9 FIG. is a schematic diagram of the overall structure of the non-contact holographic control panel based on Embodiment 3 of the present application;

[0049] Figure 10It is a schematic diagram of the flipping relationship between the control panel image in the image board and the image displayed on the control panel in the first embodiment of the present application;

[0050] Figure 10 In it, a is a schematic diagram of the control panel image in the image board of the first embodiment;

[0051] Figure 10 In it, b is a schematic diagram of the image displayed on the non-contact holographic control panel of the first embodiment. Detailed implementation manners

[0052] To make the purpose, technical solutions and effects of the present application clearer and more definite, the following further describes the present application in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application.

[0053] Those skilled in the art of the present technology can understand that unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "including" used in the specification of the present application means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0054] Those skilled in the art of the present technology can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0055] The present application provides a non-contact holographic control panel, such as Figure 1 and Figure 2As shown, the non-contact holographic control panel includes: a housing 1, a light source 3, an infrared sensing device 2, and a holographic image plate 4; the housing 1 has an opening 100, which is arranged toward the human eye; the light source 3 is disposed within the housing 1; the infrared sensing device 2 is disposed on the housing 1 and located at the opening 100 to form a holographic sensing area within the opening 100; the holographic image plate 4 is located on a side of the light source 3 away from the opening 100 and is used to receive light emitted by the light source 3 to display a virtual control panel image in the holographic sensing area; the holographic image plate 4 is obtained by exposing a holographic dry plate 7 via an exposure device 6.

[0056] Specifically, the housing 1 is used to accommodate the light source 3, the infrared sensing device 2 and the holographic image plate 4, so that the non-contact holographic control panel can perform holographic key imaging to avoid users directly touching the keys, while enabling the non-contact holographic control panel to form an independent integral module, and this independent module can be flexibly installed on the machine.

[0057] The housing 1 is arranged vertically, with the opening 100 facing the human eye. The infrared sensing device 2 is positioned at the opening 100, thereby forming the holographic sensing area 5 within the opening 100. The holographic image plate 4 is formed from the holographic dry plate 7 through an exposure process. The holographic image plate 4 records control panel image information and faces the opening 100. The light source 3 is located on the side of the holographic image plate 4 closest to the opening 100 (i.e., the side of the holographic image plate 4 facing the human eye). When the light source 3 is turned on and emits light toward the holographic image plate 4, the control panel image is diffracted by the holographic image plate 4, and the control panel image is displayed at a certain distance within the holographic sensing area 5. When a user clicks the control panel image in the holographic sensing area 5, the infrared sensing device 2 corresponding to the corresponding position within the holographic sensing area 5 is unable to receive the infrared signal, thereby identifying the location of the user's finger click and sending the corresponding panel command to the machine to achieve control of the machine.

[0058] It can be seen that the present application forms the holographic sensing area at the opening 100 through the infrared sensing device 2, and displays the control panel image in the holographic sensing area through the cooperation of the light source 3 and the holographic image plate 4, so that the user can control the machine by clicking the virtual holographic sensing area with his finger without the need for the user to directly touch the real control panel, thereby solving the health hazard problem caused by the contact control panel and avoiding the problems of button wear, blurred handwriting and service life caused by contact with the real control panel.

[0059] Meanwhile, the light source 3 described in the present application is built into the housing 1, so that while the non-contact holographic control panel can perform holographic key imaging and avoid direct user touch on the keys, the non-contact holographic control panel can form an independent integral module, and this independent module can be flexibly installed in various terminal devices, improving the system integration efficiency, with a compact structure, reduced volume, convenient installation, and expanding the application range of the holographic keyboard.

[0060] The housing 1 includes a housing body 10 and extension parts 11; there are 4 extension parts 11, which are respectively connected to the housing body 10 around the opening 100 and extend towards the inside of the housing body 10 in a direction perpendicular to the housing body 10. The opening 100 is located between the extension parts 11; the infrared sensing device 2 is respectively arranged on the extension parts 11 and is located on the side of the extension parts 11 close to the housing body 10 (i.e., the inner side of the extension parts 11).

[0061] It should be noted that the holographic image plate 4 needs to correspond to the opening 100 so that the projection optical path is not blocked by the housing or other components, and the control panel image on the holographic image plate 4 can be accurately projected onto the holographic sensing area 5. At the same time, the holographic image plate 4 only displays a fixed control panel image. Therefore, the non-contact holographic control panel described in the present application is only applicable to a control panel where one key corresponds to one instruction (such as keyboards, elevators, washing machines, some mechanical equipment, etc.), and is not applicable to a control panel with changing screens such as page turning and next level.

[0062] In one embodiment of the present application, the light source 3 can be an LED or a laser diode to ensure that the volume of the light source 3 is small enough to be accommodated in the housing 1, which is beneficial to the overall thinness and lightness of the system.

[0063] As Figure 2 shown, the infrared sensing device 2 includes at least one infrared sensing unit, and the infrared sensing unit includes two infrared sensing modules 20; specifically, the infrared sensing module 20 includes an infrared emitter 21 and an infrared receiver 22; in the infrared sensing module 20, the infrared emitter 21 and the infrared receiver 22 are respectively arranged on opposite sides of the opening 100, so that the infrared emitter 21 and the infrared receiver 22 can be arranged opposite to each other, and then the infrared receiver 22 can accurately receive the signal emitted by the infrared emitter 21. The infrared rays emitted by the two infrared sensing modules 20 are perpendicular to each other to ensure that any position in the holographic sensing area 5 can be covered by infrared rays without missing sensing points.

[0064] When there are multiple infrared sensing units, the multiple infrared sensing units are arranged in sequence along the depth direction of the shell 1, that is, the multiple infrared sensing units are arranged in sequence along the arrangement direction of the holographic image plate 4 and the human eye, so as to increase the depth of the holographic sensing area, so as to achieve different response effects corresponding to different click depths, improve sensing sensitivity, and avoid accidental touches.

[0065] like Figure 1 As shown, the holographic image plate 4 includes a transparent substrate layer 41 and a holographic material layer 42; the transparent substrate is arranged toward the light source 3, and the holographic material layer 42 is arranged on the side of the transparent substrate layer 41 away from the light source 3; the holographic material of the holographic material layer 42 is exposed and contains control panel pattern information.

[0066] In one embodiment of the present application, the distance between the holographic image plate 4 and the holographic sensing area 5 is 0.5 cm to 3 cm. The setting of the distance between the holographic image plate 4 and the holographic sensing area 5 in this embodiment can prevent the user from directly contacting the holographic image plate 4 when touching the holographic sensing area 5 due to the distance between the two being too small.

[0067] like Figure 3 、 Figure 6 and Figure 7 As shown, the exposure device 6 includes an image plate 61, a light source assembly, and a holographic dry plate 7. The image plate 61 has a control panel image and is arranged opposite and parallel to the holographic dry plate 7. The light source assembly is used to emit light toward the image plate 61 and / or the holographic dry plate 7, and to ensure that the light that passes through the image plate 61 and reaches the holographic dry plate 7 and the light that directly reaches the holographic dry plate 7 are respectively on two sides of the holographic dry plate 7, so as to expose the holographic dry plate 7 on opposite sides.

[0068] Specifically, the holographic dry plate 7 includes a transparent substrate layer 72 and a holographic material layer 71 coated on the transparent substrate layer 72. The difference between the holographic dry plate 7 and the holographic image plate 4 is that the holographic material layer 71 of the holographic dry plate 7 is an unexposed holographic material, while the holographic image plate 4 is made by exposing the holographic dry plate 7, and the control panel image information is recorded in the holographic material.

[0069] The image plate 61 and the holographic dry plate 7 are arranged opposite and parallel to each other, and a certain gap is retained between the image plate 61 and the holographic dry plate 7. The width of the gap is 0.5 cm to 3 cm, so as to avoid the problem of low brightness of the holographic image caused by light loss due to the excessive width of the gap between the two.

[0070] Based on the different exposure light paths for the holographic dry plate 7, the present application explains the exposure of the holographic dry plate 7 from the following three embodiments:

[0071] Example 1

[0072] As Figure 3 shown, the light source assembly is a light emitter 62; the light emitter 62 is arranged on one side of the holographic material layer 71 of the holographic dry plate 7 and is higher than the holographic dry plate 7 to emit light towards the holographic dry plate 7; the image plate 61 is placed on one side of the transparent substrate of the holographic dry plate 7, such that the image plate 61, the holographic dry plate 7, and the light source 3 are arranged in sequence, and as Figure 4 shown, the proximal angle formed between the light emitter 62 and the proximal end of the holographic dry plate 7 is α, and the distal angle formed between the light emitter 62 and the distal end of the holographic dry plate 7 is θ.

[0073] This embodiment is a single-beam optical path, that is, the light emitted by the light emitter 62 directly irradiates the holographic dry plate 7 from one side of the holographic material layer 71 of the holographic dry plate 7 (for simplicity of description, this side is also referred to as the front of the holographic dry plate 7, and the other side is its back); because the holographic dry plate 7 is transparent, when the light irradiates the holographic dry plate 7, it also passes through the holographic dry plate 7 and irradiates the image plate 61. As Figure 10 shown, the image plate 61 has a control panel image, and this image has a flipped relationship with the image displayed on the holographic control panel; and the control panel image part of the image plate 61 is made of a high-reflection material, and the rest is made of a black light-absorbing material. The light beam emitted by the light emitter 62 irradiates the holographic dry plate 7 from the front. The high-reflection material part of the image plate 61 reflects the light and irradiates the holographic dry plate 7 from the back. The two beams of light received by the front and back of the holographic dry plate 7 interfere at its holographic material layer 71, and the information of the control panel image is recorded on its holographic material layer 71. In the holographic control panel, the holographic image plate 4 is the exposed holographic dry plate 7. The light source 3 irradiates the holographic image plate 4 from one side of the transparent substrate layer 41 of the holographic image plate 4 (for simplicity of description, this side is also referred to as the back of the holographic image plate 4, and the other side is its front). A flipped pattern, that is, the control panel pattern, can be seen in the holographic sensing area 5.

[0074] Meanwhile, in this embodiment, the value range of the distance between the image plate 61 and the holographic dry plate 7 still satisfies 0.5 cm to 3 cm, which is the same as the distance between the holographic image plate 4 and the holographic sensing area 5 in the holographic control panel, that is, this distance is the distance between the virtual control panel image and the holographic image plate 4.

[0075] In one implementation manner of this embodiment, the light emitter 62 is a laser.

[0076] Based on this embodiment, in the holographic control panel, the proximal angle α formed between the light source 3 and the proximal end of the holographic image plate 4, and the distal angle θ formed between the light source 3 and the distal end of the holographic image plate 4 satisfy: 0 < α < θ < 90°.

[0077] Specifically, the angles between the light source 3 and the holographic image plate 4 include α and θ, where α is the proximal angle formed between the light source 3 and the proximal end of the holographic image plate 4, and θ is the distal angle formed between the light source 3 and the distal end of the holographic image plate 4. More preferably, the value range of α is 45° to 75°, and the value range of θ is 30° to 45°, so as to avoid the overall thickness of the control panel becoming too thick due to too large an angle, and at the same time avoid the problems of limited illumination area and low brightness of the distal display due to too small an angle.

[0078] In the holographic control panel, it is necessary to reproduce the exposure optical path because the display (i.e., reproduction) of the holographic image depends on the same optical conditions to correctly decode the stored optical information. When reproducing the exposure optical path, the angles (α and θ) between the light source 3 and the holographic image plate 4 are the same as the angles (α and θ) between the light emitter 62 and the holographic plate 7, but in the opposite direction (i.e., in the exposure optical path, the light emitter 62 is located on the side of the holographic material layer 71 close to the holographic plate 7, while in the control panel, the light source 3 is located on the side of the transparent substrate close to the holographic image plate 4).

[0079] As a counterexample, as Figure 5 shown, in the holographic control panel, if conventional technical means are adopted, the light source 3 irradiates the holographic image plate 4 at the same angle and direction as when the holographic plate 7 is exposed, that is, the light source 3 is located on the side of the holographic material layer 42 of the holographic image plate 4, then the human eye can also see the control panel image; however, the difference is that the focal plane of the image felt by the human eye is inside the control panel, that is, a holographic image is formed on the side of the holographic image plate 4 away from the human eye. In this case, when the user clicks in the infrared sensing area, the finger will unconsciously want to click on the control panel image and finally land on the holographic image plate 4, resulting in contact with the holographic image plate 4. Even if the user consciously avoids contact, the form of the image focal plane inside the machine is not conducive to distance judgment, and there is still a risk of direct contact by the user.

[0080] Embodiment Two

[0081] The exposure optical path of Embodiment Two is a double-beam optical path.

[0082] Specifically, the light source assembly includes a light emitter 62 and an exposure assembly; as Figure 6As shown in the figure, the exposure component includes a beam splitter 63, a first mirror 64, and a second mirror 65. The beam splitter 63 is located in the light-emitting direction of the light emitter 62 and receives the light emitted by the light emitter 62. The first mirror 64 and the second mirror 65 are located in two light-emitting directions of the beam splitter 63. The light emitted by the light emitter 62 is split into two beams by the beam splitter 63, reflected by the second mirror 65 and the first mirror 64 respectively to deflect the light direction, and emit light to the front of the holographic plate 7 and the image plate 61 respectively. The light transmitted through the image plate 61 is directed to the back of the holographic plate 7 and interferes with the light obtained on the front of the holographic plate 7, thereby realizing the exposure of the holographic plate 7 and forming a double-beam optical path. The two beams of light interfere and expose at the holographic plate 7, thereby recording the image information of the image plate 61 on the holographic plate 7.

[0083] Specifically, the image plate 61 has a control panel image, which is consistent with the image displayed on the holographic control panel. The image part of the image plate 61 is a light-transmitting diffuse reflection material (such as frosted glass), and the rest of the image plate 61 is an absorbent material. At the same time, in this embodiment, the value range of the distance between the image plate 61 and the holographic plate 7 still satisfies 0.5 cm to 3 cm, which is the same as the distance between the holographic image plate 4 and the holographic sensing area 5 in the holographic control panel.

[0084] Based on this embodiment, in the holographic control panel, the proximal angle α formed between the light source 3 and the proximal end of the holographic image plate 4 and the distal angle θ formed between the light source 3 and the distal end of the holographic image plate 4 satisfy: 0 < α < θ < 90°. More preferably, the value range of α is 45° to 75°, and the value range of θ is 30° to 45°, so as to avoid the overall thickness of the control panel becoming too thick due to too large an angle, and at the same time avoid the problems of limited illumination area and low brightness at the distal end due to too small an angle.

[0085] In the holographic control panel, it is necessary to reproduce the exposure optical path because the display (i.e., reproduction) of the holographic image depends on the same optical conditions to correctly decode the stored optical information. When reproducing the exposure optical path, the angles (α and θ) between the second mirror 65 and the holographic plate 7 and the angles (α and θ) between the light source 3 and the holographic image plate 4 are the same, but the directions are opposite (i.e., in the exposure optical path, the second mirror 65 is located on the side of the holographic material layer 71 close to the holographic plate 7, while in the holographic control panel, the light source 3 is located on the side of the transparent substrate close to the holographic image plate 4).

[0086] In one embodiment of this embodiment, the light emitter 62 is a laser.

[0087] It should be noted that, whether it is Embodiment 1 or Embodiment 2, through the design of the exposure optical path, the light source 3 in the holographic control panel can be encapsulated inside the housing 1 (i.e., inside the control panel), without the need for an additional light source, enabling the non-contact holographic control panel to be flexibly installed on the machine as an independent module.

[0088] Embodiment 3

[0089] Whether based on Embodiment 1 or Embodiment 2, there is a certain angle between the light source 3 and the holographic image plate 4 in the holographic control panel. As a result, the distal end of the holographic image plate 4 will have a problem of reduced display brightness due to greater light energy loss. Therefore, Embodiment 1 and Embodiment 2 are not suitable for large-sized control panels. To solve this problem, Embodiment 3 is proposed.

[0090] As Figure 7 shown, the exposure assembly includes a beam splitter 63, a first mirror 64, a light guide prism 67, and a second mirror 65; the beam splitter 63 is located in the light-emitting direction of the light emitter 62 and receives the light emitted by the light emitter 62; the first mirror 64 and the second mirror 65 are located in two light-emitting directions of the beam splitter 63. The light is split into two beams after passing through the beam splitter 63. One beam is reflected by the first mirror 64 and then irradiates the image plate 61, and the light is transmitted from the image plate 61 to the back side of the holographic plate 7 (i.e., the side of the transparent substrate layer 72); the other beam is reflected by the second mirror 65 and then irradiates the light guide prism 67 and then transmitted to the front side of the holographic plate 7 (i.e., the side of the holographic material layer 71); the two beams interfere and expose at the holographic plate 7, thereby recording the image information of the image plate 61 on the holographic plate 7.

[0091] In this embodiment, the light guide prism has a certain tilt angle, which is greater than the total reflection angle, so that the light enters the inside of the holographic plate 7 at an angle greater than the total reflection angle after passing through the light guide prism; in addition, a beam expander or a collimating device 66 can be added to the optical path to obtain a larger spot diameter and better beam quality.

[0092] In this embodiment, as Figure 8 shown, the holographic plate 7 includes a coupling-in region 8 and a coupling-out region 9; in the holographic control panel, the coupling-in region 8 corresponds to the light source 3 to receive the light emitted by the light source 3; the coupling-out region 9 is located in the light-emitting direction of the coupling-in region 8.

[0093] Specifically, the holographic dry plate 7 is divided into the light-coupling region 8 and the light-extracting region 9, and there is a certain interval between the light-coupling region 8 and the light-extracting region 9. In order to improve the light energy utilization rate and ensure that after the light enters the light-coupling region 8, it is transmitted to the light-extracting region 9 as completely as possible. In an embodiment of this embodiment, the width of the light-extracting region 9 (i.e., the dimension of the light-extracting region 9 along the direction perpendicular to the image propagation direction) is smaller than the width of the light-coupling region 8.

[0094] The image plate 61 has a control panel image; the image part on the image plate 61 is made of a light-transmissive diffusing material (such as frosted glass), and the rest is an absorbent material. The light guide prism 67 is attached to the front surface of the holographic dry plate 7, so that the light guide prism 67 and the holographic dry plate 7 form an integral structure, and the refractive index of this integral structure is consistent. Further, in order to avoid the interference of air, a refractive index matching liquid is filled between the light guide prism 67 and the holographic dry plate 7. In this embodiment, the value range of the distance between the image plate 61 and the holographic dry plate 7 still satisfies 0.5 cm to 3 cm, which is the same as the distance between the holographic image plate 4 and the holographic induction region 5 in the holographic control panel.

[0095] In this embodiment, during exposure, first, the image plate 61 in the exposure light path is removed. The light emitted by the light emitter 62 is split by the beam splitter 63. A part of the parallel light reaches the first mirror 64 and is incident on the light-coupling region 8 of the holographic dry plate 7 from the back surface of the holographic dry plate 7 through the first mirror 64; another part of the parallel light passes through the second mirror 65 and the light guide prism 67 in sequence and then is incident on the light-coupling region 8 of the holographic dry plate 7 from the front surface of the holographic dry plate 7, thereby completing the exposure of the light-coupling region 8.

[0096] After the exposure of the light-coupling region 8 is completed, the image plate 61 is placed in the exposure light path again. The light emitted by the light emitter 62 is split by the beam splitter 63. A part of the parallel light passes through the first mirror 64 and the image plate 61 in sequence and then is incident on the light-extracting region 9 of the holographic dry plate 7 from the back surface of the holographic dry plate 7; another part of the parallel light passes through the second mirror 65 and the light guide prism 67 in sequence and then is incident on the light-extracting region 9 of the holographic dry plate 7 from the front surface of the holographic dry plate 7, thereby completing the exposure of the light-extracting region 9.

[0097] Therefore, in this embodiment, when the light-coupling region 8 is exposed, the image plate 61 is not placed in the exposure light path; when the light-extracting region 9 is exposed, the image plate 61 is placed in the exposure light path.

[0098] Such as Figure 9As shown, in the non-contact holographic control panel, the holographic image plate 4 is the exposed holographic dry plate 7. The holographic image plate 4 also includes a light-coupling-in area 43 and a light-coupling-out area 44. The light emitted by the light source 3 shines from the back of the holographic image plate 4 towards the light-coupling-in area 43, and is coupled into the holographic image plate 4 from the light-coupling-in area 43, so as to propagate by total internal reflection inside the holographic image plate 4, and is coupled out when it propagates to the light-coupling-out area 44, and then the control panel image can be seen in the holographic sensing area 5.

[0099] Based on this embodiment, when reproducing the exposure optical path in the non-contact holographic control panel, the light source 3 can be opposite to the light-coupling-in area 43 of the holographic image plate 4, and the light shines vertically on the holographic image plate 4. Since there is no image information in the light-coupling-in area 43 and it only serves as a light supply, the image is emitted from the light-coupling-out area 44, and the light-coupling-out area 44 is arranged at another spatial position relative to the light-coupling-in area 43, and the two do not coincide and do not interfere with each other.

[0100] In the first and second embodiments, in order not to block the optical path between the "holographic image plate 4 - holographic sensing area 5 - human eye", therefore, taking Figure 1 as an example, the vertical height of the light source 3 cannot be set within this optical path range, thus increasing the total height of the holographic control panel. On the other hand, in order to ensure that the distal end of the holographic image plate 4 can also receive light irradiation, the horizontal position of the light source 3 should be at a certain distance from the holographic image plate 4, thus increasing the thickness of the holographic control panel. In this embodiment, the optical waveguide display scheme is adopted, and the image propagates by total internal reflection inside the holographic image plate 4. The light emitted by the light source 3 only needs to be vertically incident on the light-coupling-in area 43, which coincides with the light-coupling-in area 43 in the vertical height and does not need to be at a distance from the holographic image plate 4 in the horizontal distance. Therefore, the system structure can be more compact and the volume can be further reduced.

[0101] In one embodiment of this embodiment, the light emitter 62 is a laser.

[0102] It should be noted that Figures 1 - 9 the arrows in

[0103] all represent the light propagation direction. It should be noted that "towards the human eye" in this application means the observation orientation of a person. The viewing angle of the holographic control panel image in this application is large, and the image can be seen not only when the human eye is directly facing the image.

[0104] This application also provides a holographic display device, and the holographic display device includes the non-contact holographic control panel described in any one of the above.

[0105] In summary, the present application provides a non-contact holographic control panel and holographic display device. The non-contact holographic control panel comprises: a housing having an opening, the opening being arranged toward the human eye; a light source disposed within the housing; an infrared sensor disposed on the housing and located at the opening to form a holographic sensing area within the opening; a holographic image plate located on a side of the light source facing away from the opening and configured to receive light emitted by the light source to display a virtual control panel image within the holographic sensing area; and the holographic image plate is obtained by exposing a holographic dry plate via an exposure device. The present application forms the holographic sensing area within the opening using the infrared sensor, and displays a control panel image within the holographic sensing area through the cooperation of the light source and the holographic image plate. This allows a user to control the device by simply clicking on the virtual holographic sensing area without the user having to directly touch the actual control panel. This addresses the hygienic risks associated with contact control panels and avoids the wear and tear of the printed text, blurred text, and reduced service life caused by touching the actual control panel. At the same time, the light source described in the present application is built into the housing, so that the non-contact holographic control panel can perform holographic key imaging and avoid users from directly touching the keys, while enabling the non-contact holographic control panel to form an independent integral module. This independent module can be flexibly installed in various terminal devices, thereby improving system integration efficiency, having a compact structure, reduced volume, and easy installation, and expanding the application range of the holographic keyboard.

[0106] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0107] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0108] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0109] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0110] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0111] Of course, the above description of the embodiments of the present invention is relatively detailed, but it should not be construed as a limitation on the protection scope of the present invention. The present invention may have other various implementation manners. Based on this implementation manner, other implementation manners obtained by those of ordinary skill in the art without any creative work belong to the protection scope of the present invention. The protection scope of the present invention shall be subject to the appended claims.

Claims

1. A non-contact holographic control panel, characterized in that, It includes: shell; The housing has an opening, and the opening is arranged toward the human eye; a light source, disposed in the housing; an infrared sensing device, disposed on the housing and located at the opening to form a holographic sensing area within the opening; The holographic image plate is located on the side of the light source away from the opening and is used to receive the light emitted by the light source to display a virtual control panel image in the holographic sensing area; the holographic image plate is obtained by exposing a holographic dry plate through an exposure device.

2. The non-contact holographic control panel according to claim 1, characterized in that, The infrared sensing device includes at least one infrared sensing unit, which includes two infrared sensing modules. Each infrared sensing module includes an infrared transmitter and an infrared receiver that are arranged opposite to each other. The infrared light directions of the two infrared sensing modules are arranged perpendicular to each other.

3. The non-contact holographic control panel according to claim 1, wherein The holographic image plate comprises: a transparent substrate layer; The holographic material layer is arranged on a side of the transparent substrate layer away from the light source.

4. The non-contact holographic control panel according to claim 1, characterized in that, The exposure device comprises: an image board having an image of a control panel; a holographic dry plate arranged in parallel with the image plate; the holographic dry plate comprises a holographic material layer and a transparent substrate layer, the transparent substrate layer of the holographic dry plate being arranged opposite to the image plate; The light source assembly is used to emit light toward the image plate and / or the holographic dry plate, and the light irradiated onto the holographic dry plate through the image plate and the light directly irradiated onto the holographic dry plate are respectively on two sides of the holographic dry plate, so as to expose the holographic material of the holographic material layer on different sides.

5. The non-contact holographic control panel according to claim 4, characterized in that The light source assembly comprises: a light emitter, arranged on one side of the holographic material layer of the holographic dry plate and higher than the holographic dry plate, so as to emit light toward the holographic dry plate; A proximal angle α formed between the light emitter and the proximal end of the holographic dry plate, and a distal angle θ formed between the light emitter and the distal end of the holographic dry plate satisfy: 0<α<θ<90°.

6. The non-contact holographic control panel according to claim 4, characterized in that, The light source assembly comprises: Light emitter; The exposure assembly is located between the light emitter and the image plate and the holographic dry plate, so as to emit light to the image plate and the holographic dry plate respectively.

7. The non-contact holographic control panel according to claim 6, wherein The exposure assembly comprises: A spectroscope, located in the light emitting direction of the light emitter and receiving the light emitted by the light emitter; a first reflecting mirror, located between the beam splitter and the image plate, for reflecting the light emitted by the beam splitter to the image plate; The second reflecting mirror is located between the beam splitter and the holographic dry plate and is used to reflect the light emitted from the beam splitter to the holographic dry plate.

8. The non-contact holographic control panel according to claim 6, wherein The exposure assembly comprises: A spectroscope, located in the light emitting direction of the light emitter and receiving the light emitted by the light emitter; a first reflecting mirror, located between the beam splitter and the image plate, for reflecting the light emitted by the beam splitter to the image plate; a light guide prism, located on a side of the holographic dry plate facing away from the image plate and attached to the holographic dry plate; The second reflecting mirror is located between the beam splitter and the holographic dry plate and is used to reflect the light emitted from the beam splitter to the light guide prism.

9. The non-contact holographic control panel according to claim 8, characterized in that, The holographic image plate comprises: The coupling-in area, corresponding to the light source, receives the light emitted by the light source and couples it into the holographic image plate; The coupling-out area, located in the light-emitting direction of the coupling-in area, couples the light out of the holographic image plate; the width of the coupling-out area is smaller than the width of the coupling-in area.

10. A holographic display device, characterized in that, It includes the non-contact holographic control panel according to any one of claims 1-9.

Images