Head-mounted device and focusing control method of head-mounted device

Abstract

The invention discloses a head-mounted device and a focusing control method of the head-mounted device, the head-mounted device comprises a shell, a display screen, a lens module and an adjusting assembly, a light-transmitting window is formed in one side of the shell and is used for corresponding to human eyes, the display screen is arranged in an inner cavity of the shell and is located on one side opposite to the light-transmitting window, and the adjusting assembly is used for adjusting the focusing of the lens module. The display screen is arranged in an inner cavity of the shell and used for emitting light, the lens module is arranged in the inner cavity of the shell, located between the display screen and the light-transmitting window and used for refraction and conduction of the light, the adjusting assembly comprises a piezoelectric film arranged between the lens module and the light-transmitting window, the piezoelectric film is made of a light-transmitting material, and the piezoelectric film is made of a transparent material. The piezoelectric film is used for being electrically connected with an external power supply so as to deform when external voltage changes. And the emergent angle of the light is changed, so that focusing adjustment is carried out. The structure can be compatible with common users and users with eyesight problems for simultaneous use, the users with eyesight problems do not need to wear glasses, and the experience feeling of the users is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic products, and in particular to a head-mounted device and a focus control method for the head-mounted device. Background Art

[0002] Common AR or VR products require users with vision problems to wear myopia glasses or hyperopia glasses to see the screen images clearly. However, most AR or VR products are head-mounted devices that are fixed to the user's head with straps. It is very inconvenient for users to use them while wearing glasses. The overlapping of glasses can easily cause wearing discomfort, affecting the user experience. Summary of the invention

[0003] The main purpose of the present invention is to provide a head-mounted device and a focus control method for the head-mounted device, aiming to solve the problem that current head-mounted devices require the assistance of glasses for users with vision problems to wear and experience them.

[0004] To achieve the above object, the present invention provides a head mounted device, comprising:

[0005] A housing, wherein a light-transmitting window is formed on one side of the housing, and is used to correspond to a human eye;

[0006] A display screen is disposed in the inner cavity of the housing and on a side facing away from the light-transmitting window, and is used to emit light;

[0007] A lens module, disposed in the inner cavity of the housing and between the display screen and the light-transmitting window, for refracting and conducting light; and

[0008] The adjustment component includes a piezoelectric film arranged between the lens module and the light-transmitting window. The material of the piezoelectric film is a light-transmitting material. The piezoelectric film is used to electrically connect to an external power source so that it can be deformed when the external voltage changes.

[0009] Optionally, the piezoelectric film can be arranged to protrude toward the light-transmitting window.

[0010] Optionally, the adjustment assembly further comprises a support portion, the support portion is fixed to the inner wall surface of the shell, and opposite sides of the support portion are used for electrode wire installation;

[0011] The edge of the piezoelectric film is fixed to the support portion and is used for connecting with the electrode wire.

[0012] Optionally, the support portion is configured as a light-transmitting film.

[0013] Optionally, the lens module comprises:

[0014] a refractive lens assembly, comprising at least one lens disposed in the inner cavity of the housing, the lens being used to refract light to adjust an emission angle of the light; and

[0015] The conducting structure is arranged on the side of the lens facing away from the display screen and is used for conducting light.

[0016] Optionally, the adjustment component further comprises a support portion, the support portion is for mounting the piezoelectric film, and the support portion is configured as a light-transmitting film;

[0017] The conductive structure includes an optical polymer filled between the lens and the light-transmitting film.

[0018] Optionally, the optical polymer is made of thermoplastic resin.

[0019] Optionally, the piezoelectric film is configured as a polycrystalline piezoelectric ceramic.

[0020] The present invention also provides a focus control method for a head mounted device, the focus control method for the head mounted device comprising the following steps:

[0021] When receiving a focus adjustment instruction, controlling the voltage to change so that the piezoelectric film is deformed to adjust the focus;

[0022] When a focus stop instruction is received, the control voltage maintains the current state.

[0023] Optionally, before the step of controlling the voltage change to deform the piezoelectric film to perform focus adjustment when a focus adjustment instruction is received, the method further includes:

[0024] When the user visually recognizes a blurred image on the display screen, controlling a button of the head mounted device to issue a focus instruction;

[0025] Before the step of controlling the voltage to maintain the current state when receiving the focus stop instruction, the method further includes:

[0026] When the user visually recognizes a clear image on the display screen, the user controls a button of the head mounted device to issue a stop focusing instruction.

[0027] In the technical solution of the present invention, the shell is worn on the user's head through a strap or other means, so that the user's eyes can observe the picture on the display screen through the light-transmitting window. After the device is turned on, the picture on the display screen refracts and conducts light through the lens module and enters the human eye through the piezoelectric film. When the wearer has vision problems, the piezoelectric film can be deformed due to the inverse piezoelectric effect by adjusting the external voltage. The deformed piezoelectric film is a non-planar structure that can play the role of a lens, changing the angle of light emission, thereby adjusting the focus. This structure can be used by ordinary users and users with vision problems at the same time. Users with vision problems do not need to wear glasses, which improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of an embodiment of a head mounted device provided by the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of a control device for a head mounted device in a hardware operating environment according to an embodiment of the present invention;

[0031] Figure 3 A flowchart of a focus control method for a head mounted device provided by the present invention.

[0032] Description of Figure Numbers:

[0033] Label name Label name 100 Headset 32 Conductive structure 1 case 41 Piezoelectric film 11 Light-transmitting window 41 Support 2 Display 5 Electrical signal connector 31 Refractive lens set

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if a directional indication is involved in the embodiment of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The present invention provides a head-mounted device and a focus control method for the head-mounted device, which utilizes the inverse piezoelectric effect of a piezoelectric film to achieve focus adjustment, so that users with vision problems do not need to wear glasses, and can recognize clear images through the focus adjustment function of the device itself. Ordinary users do not need to turn on the function of the piezoelectric film, and it only needs to play a light-transmitting role. Figure 1 An embodiment of a head mounted device provided by the present invention.

[0039] Please refer to Figure 1 The head mounted device 100 includes a shell 1, a display screen 2, a lens module and an adjustment component. A light-transmitting window 11 is formed on one side of the shell 1 for corresponding to the human eye. The display screen 2 is arranged in the inner cavity of the shell 1 and is located on the side facing away from the light-transmitting window 11 for emitting light. The lens module is arranged in the inner cavity of the shell 1 and is located between the display screen 2 and the light-transmitting window 11 for refraction and conduction of light. The adjustment component includes a piezoelectric film 41 arranged between the lens module and the light-transmitting window 11. The material of the piezoelectric film 41 is a light-transmitting material. The piezoelectric film 41 is used to electrically connect to an external power supply so as to be able to deform when the external voltage changes.

[0040] In the technical solution of the present invention, the shell 1 is worn on the user's head through a strap or other means, so that the user's eyes can observe the picture on the display screen 2 through the light-transmitting window 11. After the device is turned on, the picture on the display screen 2 is refracted and conducted by the lens module, and is projected into the human eye through the piezoelectric film 41. When the wearer has vision problems, the piezoelectric film 41 can be deformed due to the inverse piezoelectric effect by adjusting the external voltage. The deformed piezoelectric film 41 is a non-planar structure, which can play the role of a lens, change the angle of light emission, and thus adjust the focus. This structure can be used by ordinary users and users with vision problems at the same time. Users with vision problems do not need to wear glasses, which improves the user experience.

[0041] It should be noted that the principle of the piezoelectric film 41 is that when a voltage is applied in the polarization direction of the dielectric, the atoms or ions constituting the dielectric, under the action of the electric field, the positive and negative charge centers of the atoms or ions do not overlap, that is, the positively charged nucleus and the negative charge centers of its shell electrons do not overlap, resulting in electron displacement. Or the positive and negative ions constituting the dielectric, under the action of the electric field, produce relative displacement, because the distance between the positive and negative ions changes, resulting in a change in the shape of the piezoelectric film 41.

[0042] It can be understood that the light-transmitting window 11 is realized by setting a transparent area on the shell 1, or installing transparent glass corresponding to the opening. The shell 1 is a sealed whole, so that its internal parts are protected. At the same time, the light-transmitting window 11 can have a certain length to correspond to the left and right eyes at the same time, or it can be two ovals to correspond to the left eye and the right eye respectively.

[0043] The piezoelectric film 41 is preferably set as a polycrystalline piezoelectric ceramic. Polycrystalline piezoelectric ceramics have strong and stable piezoelectric properties, and also have the characteristics of high Curie temperature, large anisotropy, small dielectric constant, etc. It is understandable that piezoelectric materials with different properties can be obtained by adding one or two other trace elements, such as niobium, antimony, tin, manganese, tungsten, etc., and the present invention does not impose any restrictions on this.

[0044] It should be understood that the piezoelectric film 41 deforms when the external voltage changes, and should be able to restore the initial flat film state after the voltage returns to zero. At this time, it only plays a light transmission role and cannot change the emission direction of the light. With the change of the voltage, the piezoelectric film 41 changes in one direction. In this embodiment, the piezoelectric film 41 can be convexly arranged in the direction of the light-transmitting window 11. That is, the piezoelectric film 41 can only bulge in the direction of the human eye and deform into the shape of a convex lens.

[0045] The piezoelectric film 41 is thin, and in order to facilitate its connection to electricity, in this embodiment, the adjustment component also includes a support portion 41, which is fixed to the inner wall surface of the housing 1. The opposite sides of the support portion 41 are used for the installation of electrode wires. The edge of the piezoelectric film 41 is fixed to the support portion 41 and is used to connect with the electrode wires. With the support portion 41 as the installation base, the wires corresponding to the positive and negative electrodes are laid on the wall surface of the housing 1 and fixed on the support portion 41. The piezoelectric film 41 is installed accordingly, thereby realizing the connection of the positive and negative electrodes.

[0046] It should be noted that the present invention does not limit the structural form of the support portion 41, and the support portion 41 as a whole should be fixed relative to the shell 1. In one embodiment, the support portion 41 is a frame structure, the middle of which is hollowed out to avoid interference with the conduction of light, and the piezoelectric film 41 only needs to be partially connected during installation.

[0047] In other embodiments, the support portion 41 may also be configured as a plate-like structure, in which case at least the middle portion of the support portion 41 should be configured as a light-transmitting material so that light can be transmitted. Considering the clarity of light transmission, in one embodiment, the support portion 41 is configured as a light-transmitting film. The preferred material is glass, which has a certain hardness and can provide a supporting effect, and has high transparency, good light transmission effect, and little loss in light transmission.

[0048] In order to ensure that the image of the display screen 2 is transmitted to the human eye, in this embodiment, the lens module includes a refractive lens group 31 and a conductive structure 32. The refractive lens group 31 includes at least one lens disposed in the inner cavity of the housing 1, and the lens is used to refract light to adjust the light emission angle; the conductive structure 32 is disposed on the side of the lens facing away from the display screen 2, and is used for light transmission. The light angle is adjusted through one or more lenses, and the transmission length of the optical path is extended through the conductive structure 32, thereby improving the spectral transmittance and refractive index, thereby ensuring that the human eye receives a clear image.

[0049] It should be understood that parameters such as the number of lenses, lens types, and spacing design of multiple lenses of the refractive lens group 31 are all determined based on the length of the shell 1 and the clarity that needs to be met. They are designed specifically for different head-mounted products. During use, the lens module's light transmission effect is fixed.

[0050] The present invention does not limit the specific form of the conductive structure 32. In one embodiment, it can be a combination of multiple lenses to achieve the effect of extending the light path. In this embodiment, when the piezoelectric film 41 is installed through the support portion 41, and the support portion 41 is set as a light-transmitting film, a closed space is formed between the light-transmitting film and the lens in the refractive lens group 31. At this time, the conductive structure 32 includes an optical polymer filled between the lens and the light-transmitting film. It should be understood that the optical polymer mentioned here is different from the optical polymer that can be deformed in the piezoelectric film 41. Its main purpose is to improve the spectral transmittance and refractive index for LCD image light transmission. In this embodiment, the material of the optical polymer is thermoplastic resin. In other embodiments, other materials can also be selected, and the present invention does not limit this.

[0051] Reference Figure 2 , Figure 2 Schematic diagram of a control device of a head mounted device 100 in a hardware operating environment according to an embodiment of the present invention.

[0052] like Figure 2 As shown, the control device of the head mounted device 100 may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen 2 (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0053] Those skilled in the art will understand that Figure 2 The structure shown in the figure does not constitute a limitation on the control device of the head mounted device 100, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0054] like Figure 2As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a focus control program of the head mounted device 100 .

[0055] exist Figure 2 In the control device of the head mounted device 100 shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the control device of the head mounted device 100 of the present invention can be arranged in the control device of the head mounted device 100, and the control device of the head mounted device 100 calls the focus control program of the head mounted device 100 stored in the memory 1005 through the processor 1001, and executes the focus control of the head mounted device provided in the embodiment of the present invention.

[0056] The embodiment of the present invention provides a focus control method for a head mounted device, referring to Figure 3 , Figure 3 This is a flowchart of the focus control of the head-mounted device.

[0057] In this embodiment, the focus control method of the head mounted device includes the following steps:

[0058] Step S10: When receiving a focus adjustment instruction, control the voltage change to make the piezoelectric film 41 deform to adjust the focus.

[0059] It is understandable that the head mounted device 100 should be turned on first so that the display screen 2 displays the image. Ordinary users can now observe clear images, while users with vision problems will see blurry images. Therefore, users who have focusing needs can trigger the focus control function.

[0060] The piezoelectric film 41 is connected to the positive and negative poles of the built-in power supply of the wearing device 100 through a soft cable connector. The voltage connected to the piezoelectric film 41 is controlled by setting up structures such as an electrical signal connector 5 and a single-chip microcomputer to cause it to deform. The deformation of the piezoelectric film 41 gradually changes with the change of voltage. At this time, the image in the user's field of view also changes in clarity due to the focus adjustment.

[0061] Step S20: When the focus stop instruction is received, the control voltage is kept at the current state.

[0062] It is understandable that when a stop focusing instruction is received, the current voltage state is maintained so that the piezoelectric film 41 is maintained in the current deformation state. During the entire use process, the deformation state should be fixed, thereby ensuring clear identification of the display screen 2 during the user experience.

[0063] It is understandable that when the user visually recognizes a blurred image on the display screen 2, the button of the head mounted device 100 is controlled to issue a focus instruction. In this process, the control device generates a focus instruction by obtaining the trigger information of the user triggering the button, and sends the instruction to the corresponding single chip. When the user visually recognizes a clear image on the display screen 2, the button of the head mounted device 100 is controlled to issue a stop focus instruction. In this process, the control device generates a stop focus instruction by obtaining the trigger information of the user triggering other buttons or triggering the same button again, and sends the instruction to the corresponding single chip.

[0064] Taking the use of a myopic user as an example, the user turns on the head mounted device 100. Since the user is myopic and does not wear lenses, the image on the display screen 2 observed by the user is blurry. At this time, the user actively controls the button on the outside of the head mounted device 100 to make the control device issue a focusing command. At this time, the input voltage of the electrode line connected to the piezoelectric film 41 changes, and the piezoelectric film 41 protrudes toward the direction of the human eye, changing the refraction angle of the light to achieve the focusing function. When the image on the display screen 2 is clear in the user's field of view, the control device issues a stop focusing command by touching the same button again or touching another case. At this time, the focusing is completed, and the piezoelectric film 41 remains in the current deformation state, thereby playing the effect of a myopic lens, and the user can start using the device to experience it.

[0065] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.

[0066] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0067] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A head mounted device, characterized in that: include: A housing, wherein a light-transmitting window is formed on one side of the housing, and is used to correspond to a human eye; A display screen is disposed in the inner cavity of the housing and on a side facing away from the light-transmitting window, and is used to emit light; A lens module, disposed in the inner cavity of the housing and between the display screen and the light-transmitting window, for refracting and conducting light; and The adjustment component includes a piezoelectric film arranged between the lens module and the light-transmitting window. The material of the piezoelectric film is a light-transmitting material. The piezoelectric film is used to electrically connect to an external power source so that it can be deformed when the external voltage changes.

2. The head mounted device according to claim 1, wherein: The piezoelectric film can be arranged to protrude toward the light-transmitting window.

3. The head mounted device according to claim 1, wherein: The adjustment assembly further comprises a support portion, the support portion is fixed to the inner wall surface of the shell, and opposite sides of the support portion are used for electrode wire installation; The edge of the piezoelectric film is fixed to the support portion and is used for connecting with the electrode wire.

4. The head mounted device according to claim 3, wherein: The supporting part is configured as a light-transmitting film.

5. The head mounted device according to claim 1, wherein: The lens module comprises: a refractive lens assembly, comprising at least one lens disposed in the inner cavity of the housing, the lens being used to refract light to adjust an emission angle of the light; and The conducting structure is arranged on the side of the lens facing away from the display screen and is used for conducting light.

6. The head mounted device according to claim 5, wherein: The adjustment assembly further comprises a support portion, the support portion is used for mounting the piezoelectric film, and the support portion is configured as a light-transmitting film; The conductive structure includes an optical polymer filled between the lens and the light-transmitting film.

7. The head mounted device according to claim 6, wherein: The optical polymer is made of thermoplastic resin.

8. The head mounted device according to claim 1, wherein: The piezoelectric film is configured as a polycrystalline piezoelectric ceramic.

9. A focus control method for a head mounted device, based on the head mounted device according to any one of claims 1 to 8, characterized in that: The focus control method of the head mounted device comprises the following steps: When receiving a focus adjustment instruction, controlling the voltage to change so that the piezoelectric film is deformed to adjust the focus; When a focus stop instruction is received, the control voltage maintains the current state.

10. The focus control method of a head mounted device according to claim 9, characterized in that: Before the step of controlling the voltage change to deform the piezoelectric film to perform focus adjustment when receiving the focus adjustment instruction, the method further includes: When the user visually recognizes a blurred image on the display screen, controlling a button of the head mounted device to issue a focus instruction; Before the step of controlling the voltage to maintain the current state when receiving the focus stop instruction, the method further includes: When the user visually recognizes a clear image on the display screen, the user controls a button of the head mounted device to issue a stop focusing instruction.

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