Optical module and system, display device, head-mounted display device and system thereof

Abstract

The present application provides an optical module, an optical system, a display device, a head-mounted display device and a display system. The optical module includes: a first wave plate and a second wave plate, both of which are located on one side of the transmission direction of the incident light, the incident light includes a first light, the first light passes through the first wave plate and the second wave plate in sequence to form a second light, and the second light is a linearly polarized light; a plane polarization reflection component, fixed on one side of the second wave plate, used to reflect the second light to the second wave plate to obtain a third light; a curved surface reflection component, used to receive the third light, and reflect the third light to the second wave plate again to form a fourth light, the fourth light is a linearly polarized light with a vibration direction perpendicular to the vibration direction of the second light, and the fourth light is transmitted to the human eye through the plane polarization reflection component.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to an optical module, an optical system, a display device, a head-mounted display device, and a display system. Background Art

[0002] With the development of technology, the field of optical display has undergone tremendous changes. Among them, near-eye display (NED) technology has achieved great results. Users can get an immersive sensory experience through NED technologies such as virtual reality (VR) and augmented reality (AR).

[0003] The structure and performance of the optical module directly affect the user's experience of using the display device including the optical module. Figure 1 and Figure 2 The optical module shown illustrates the problems existing in the prior art.

[0004] Figure 1 The optical module 100 is used to convert the light displayed by the display screen 101 into the light entering the human eye. The optical module includes a first optical component 102 and a second optical component 103.

[0005] Figure 1 The light path is represented by the gray broken line. The light emitted by the display screen 101 is reflected by the first optical device 102 to the second optical component 103. The second optical component 103 reflects the light back to the first optical component 102. The first optical component 102 further transmits the light into the human eye.

[0006] It can be seen that the optical module 100 includes one or more components that can both transmit and reflect, and a certain amount of light loss will be caused in the process of light passing through these components. For example, the reflectivity of the first optical component 102 is 50%, and the transmittance is 50%, then the remaining light efficiency of the original image displayed by the display screen 101 reaching the human eye is 50%×50%=25%. It can be seen that only a small part of the light emitted by the display screen 101 can enter the human eye, the brightness of the light entering the human eye is low, and the light energy utilization rate (light efficiency) of the optical module is low. In order to achieve a brightness acceptable to the human eye, it is usually necessary to adjust the screen brightness to a higher level, but this will cause serious heating of the screen, which not only wastes energy, but also reduces the life of the optical module.

[0007] In order to improve the light efficiency of the optical module, a polarized reflection component and a wave plate are generally provided. Figure 2Taking the optical module 200 shown as an example, the optical module 200 includes: a polarized reflection component 202, a wave plate 203 and a reflection component 204. The wave plate 203 is generally fixed or connected to the surface of the reflection component 204. At this time, the reflection component 204 can serve as a support for the wave plate 203. In order to achieve a better display effect, the reflection component 204 is generally a curved reflection component. In order to achieve the connection between the curved reflection component and the wave plate, it is necessary to process the wave plate into a curved structure, or to bond the plane wave plate to the surface of the curved reflection component. However, the processing technology of the curved wave plate is complicated, and it is difficult for the plane wave plate to bond with the surface of the curved reflection component. Even if bonding is achieved, the bonding effect is relatively poor. In order to simplify the processing technology, the wave plate can be separated from the curved reflection component, but this requires an additional support structure for the wave plate, which leads to an increase in the volume and weight of the optical module. The AR or VR display device used in the optical module is usually a head-mounted display device. The increase in the volume and weight of the head-mounted device will seriously affect the user's experience. Summary of the invention

[0008] In view of this, the present application is committed to providing an optical module, an optical system, a display device, a head-mounted display device and a display system to solve the problems of increased energy consumption, complex processing technology or increased volume caused by the existing optical modules in order to improve the light efficiency.

[0009] In a first aspect, the present application provides an optical module, which includes: a first wave plate and a second wave plate, both of which are located on one side of the transmission direction of the incident light, the incident light includes a first light, the first light passes through the first wave plate and the second wave plate in sequence to form a second light, and the second light is linearly polarized light; a plane polarization reflection component, fixed on one side of the second wave plate, used to reflect the second light to the second wave plate to obtain a third light; a curved surface reflection component, used to receive the third light and reflect the third light to the second wave plate again to form a fourth light, the fourth light is a linearly polarized light whose vibration direction is perpendicular to the vibration direction of the second light, and the fourth light is transmitted to the human eye through the plane polarization reflection component.

[0010] As an embodiment, the first wave plate is arranged on a light emitting side surface of the component formed by the incident light, and the second wave plate is arranged on a side surface of the plane polarization reflection component close to the incident light.

[0011] As an embodiment, the plane polarized reflective component includes a polarized reflective film, and the polarized reflective film is plated on a surface of the second wave plate away from the incident light.

[0012] As an embodiment, the plane polarized reflective component includes a substrate and a polarized reflective film.

[0013] As an embodiment, the polarized reflective film is used to reflect polarized light whose vibration direction is perpendicular to the incident plane and transmit polarized light whose vibration direction is parallel to the incident plane, wherein the incident plane is the plane where the light incident on the polarized reflective film and the normal line of the polarized reflective film surface are located.

[0014] As an embodiment, the element providing the incident light includes a display screen, and an angle α is formed between the second wave plate and the display screen near a surface of the display screen, and the angle α satisfies 35°≤α≤65°.

[0015] As an embodiment, the first wave plate is a 1 / 4 wave plate, and the second wave plate is Wave plate.

[0016] As an embodiment, the exit angle of the first light ray with the display screen is less than 5°. When the first light ray passes through the first wave plate or the second wave plate, the first light ray is decomposed into light ray A and light ray B. After the first light ray passes through the first wave plate and the second wave plate, the phase difference between the light ray A and the light ray B is half a wavelength.

[0017] As an embodiment, the second light ray is obliquely incident on the second wave plate at an incident angle β, and the incident angle β satisfies 35°≤β≤55°. When the second light ray passes through the second wave plate, the second light ray is decomposed into light ray A and light ray B. After the second light ray passes through the second wave plate twice, the phase difference between the light ray A and the light ray B is half a wavelength.

[0018] As an embodiment, the curved reflective component is concave toward the human eye in the vertical direction and the horizontal direction, and the focal length f of the curved reflective component satisfies the following conditions: 5 mm <f<200mm。

[0019] As an embodiment, the curved reflective component is an aspherical mirror.

[0020] As an embodiment, the curved reflective component is a semi-transparent and semi-reflective mirror.

[0021] In a second aspect, the present application provides an optical system, including a display screen, a left-eye lens assembly and a right-eye lens assembly located on a light source side of the display screen, characterized in that the left-eye lens assembly and the right-eye lens assembly respectively include the optical modules described in the first aspect.

[0022] In a third aspect, the present application provides a display device, comprising the optical system and a housing as described in the second aspect, wherein the optical system is accommodated in the housing.

[0023] As an embodiment, the display device includes: a VR display device and a camera, wherein the lens of the camera faces the human eye.

[0024] In a fourth aspect, the present application provides a head-mounted display device, comprising the optical system as described in the second aspect and a glasses frame, wherein the glasses frame comprises temples, and the optical system is fixed between the temples.

[0025] In a fifth aspect, the present application provides a head-mounted display device, characterized in that the head-mounted display device includes an optical system and a buckle as described in the second aspect arranged therein, and the buckle is used to fix the optical system in front of a person's eyes.

[0026] In a sixth aspect, the present application provides a display system, which is a virtual reality and / or augmented reality display system, characterized in that the display system includes a signal input device and a head-mounted display device such as the fourth aspect or the fifth aspect, and the head-mounted display device receives the signal from the signal input device and transmits it to the head-mounted display device for processing.

[0027] As an embodiment, the signal input device includes a handle controller for electrically connecting to the head-mounted display device.

[0028] As an embodiment, the display system is a virtual reality and / or augmented reality all-in-one machine, and the head-mounted display device is provided with an independent central processor for controlling a handle controller and displaying content.

[0029] The present application arranges a first wave plate and a second wave plate, and fixes the second wave plate to a plane polarized reflection component. On the basis of improving the light efficiency of the optical module, on the one hand, it avoids the problem of complicated process caused by connecting the wave plate to the curved reflection component, and on the other hand, it does not need to add an additional support device for the wave plate, thereby reducing the volume of the optical module and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of a light path trajectory of an optical module in the prior art.

[0031] Figure 2 The figure is a schematic diagram of the light path of another optical module in the prior art.

[0032] Figure 3 The figure is a schematic diagram of the optical path trajectory of the optical structure of an optical module of the present invention.

[0033] Figure 4 The figure is a schematic diagram of the optical path of the polarized reflection component in the optical module of the present invention. DETAILED DESCRIPTION

[0034] The present application proposes an optical module to solve the technical problems existing in the prior art. Figure 3 An optical module 300 proposed in an embodiment of the present application includes: a first wave plate 301 , a second wave plate 303 , a plane polarization reflection component 304 , and a curved reflection component 305 .

[0035] The component 500 for forming incident light emits incident light to the optical module. The incident light may include a first light L1. For ease of description, the component 500 for forming incident light is referred to as the light source 500 below.

[0036] Take the light source 500 as a display screen as an example. The light source 500 is used to emit a first light ray L1 to display an original image. The original image can be a picture or a video. The first light ray L1 can be linearly polarized light. The display screen can be a passive light-emitting display screen, such as a liquid crystal display (LCD). The display screen can also be an active light-emitting display screen, such as a light-emitting diode display (LED). Since the active light-emitting screen has a better light-emitting effect, the active light-emitting screen is more widely used.

[0037] In order to explain the function of the first wave plate 301 or the second wave plate 303 , the principle of the wave plate will be introduced below.

[0038] When light enters the wave plate, birefringence occurs and the light is decomposed into two polarized lights with perpendicular vibration directions, different propagation speeds, and different refractive indices, namely light A and light B. Light A obeys the law of refraction and is called ordinary wave (ordinary wave, referred to as o light). Light B does not refract according to the angle of the refraction law and is called extraordinary wave (or e light). The vibration direction of o light is perpendicular to the optical axis of the wave plate, and the vibration direction of e light is parallel to the optical axis of the wave plate. Due to the above different characteristics of o light and e light, after the light passes through the wave plate, an additional optical path difference (or optical phase difference) will be generated between o light and e light. Different wave plates can produce different additional optical path differences. For example, a wave plate that can produce an additional optical path difference of 1 / 4 wavelength between o light and e light is a 1 / 4 wave plate, and a wave plate that can produce an additional optical path difference of 1 / 2 wavelength between o light and e light is a 1 / 2 wave plate. Based on the above characteristics of the wave plate, many functions can be achieved with the help of the wave plate. Taking the 1 / 4 wave plate as an example, linear polarized light passing through the 1 / 4 wave plate can produce an additional optical path difference of 1 / 4 wavelength, thereby forming circularly or elliptically polarized light; or, circularly or elliptically polarized light passing through the 1 / 4 wave plate can produce an additional optical path difference of 1 / 4 wavelength, thereby forming linear polarized light; or, linear polarized light passing through the 1 / 4 wave plate twice can produce an additional optical path difference of 1 / 2 wavelength, thereby forming linear polarized light perpendicular to the original vibration direction.

[0039] The first wave plate 301 and the second wave plate 303 are both located at the light output side of the light output light source 500. The first light L1 passes through the first wave plate 301 and the second wave plate 303 in sequence to form the second light L2. The second light L2 is linearly polarized light, and the vibration direction is the first direction.

[0040] Continuing with the example of the light source 500 being a display screen, the first light beam L1 may have an exit angle with the display screen (i.e., the light source 500) of less than 5°. The first wave plate 301 and the second wave plate 303 are arranged so that after the first light beam L1 passes through the first wave plate 301 and the second wave plate 303, the phase difference between the o-light and the e-light is half a wavelength, thereby forming the second light beam L2. The vibration direction (i.e., the first direction) of the second light beam L2 is perpendicular to the vibration direction of the first light beam L1.

[0041] It should be noted that the present application does not limit the material of the first wave plate 301 or the second wave plate 303 , and they may be made of, for example, plastic, glass, or crystal.

[0042] In addition, the present application does not limit the location of the first wave plate 301. For example, the first wave plate 301 can be separately arranged on the light-emitting side of the light-emitting light source 500. Alternatively, the first wave plate 301 can be connected to the surface of the light-emitting side of the light-emitting light source 500, for example, attached to the surface of the light-emitting side of the light-emitting light source 500. Alternatively, the first wave plate 301 can be connected to a device arranged on the light-emitting side of the light-emitting light source 500, so as to Figure 3 For example, the first wave plate 301 can be attached to the surface of the lens 302. Considering the difficulty of attachment, the first wave plate 301 can be attached to the plane surface of the lens 302.

[0043] The plane polarization reflection component 304 is located on one side of the second wave plate, and is used to reflect the second light L2 to the second wave plate 303 to obtain the third light L3. The plane polarization reflection component 304 can reflect most of the linear polarized light with a vibration direction (or polarization direction) in the first direction (the reflectivity of the linear polarized light with a vibration direction in the first direction is greater than 50%, and can be close to 100%), and transmit most of the linear polarized light with a vibration direction perpendicular to the first direction (the transmittance of the linear polarized light with a vibration direction perpendicular to the first direction is greater than 50%, and can be close to 100%). Among them, the second direction can be perpendicular to the first direction. Therefore, the plane polarization reflection component 304 receives the second light L2 with a vibration direction in the first direction, and can reflect most of the second light L2 back to the second wave plate 303. The second light L2 passes through the second wave plate 303 to form the third light L3. The third light L3 can be circularly polarized light or elliptically polarized light.

[0044] Figure 4is an example of a polarized reflective component 400. The polarized reflective component 400 can reflect as much light component whose polarization direction is perpendicular to the incident plane (usually referred to as P light) as possible, and transmit as much light component whose polarization direction is parallel to the incident plane (usually referred to as S light) as possible. The incident plane is the plane where the incident light and the surface normal are located. Such a polarized reflective component can be called a P-transmitting S-reflecting component, for example, a P-transmitting S-reflecting film. Figure 3 As shown, the incident light includes P light ( Figure 4 Indicated by a double-headed arrow) and S light ( Figure 4 Indicated by dots). The polarized reflection component 400 reflects most of the S light in the incident light to form reflected light, and transmits most of the P light in the incident light to form transmitted light. It can be seen that when the incident light only includes P light, most of the incident light will be transmitted through the polarized reflection component 400, that is, the transmittance of the polarized reflection component 400 to the P light is greater than 50%; when the incident light only includes S light, most of the incident light will be reflected by the polarized reflection component 400, that is, the reflectance of the polarized reflection component 400 to the S light is greater than 50%.

[0045] Understandably, Figure 4 This is only an example of a polarized reflective component. The polarized reflective component of the present application may be a P-transparent S-reflective film or other components.

[0046] The curved reflective component 305 is used to receive the third light L3 and reflect the third light L3 to the second wave plate 303 again to form the fourth light L4. The fourth light L4 is linearly polarized light, and the vibration direction is the second direction. The fourth light L4 can be transmitted to the human eye through the plane polarized reflective component 304. The curved surface of the curved reflective component 305 can be concave toward the human eye in both the vertical direction and the horizontal direction. The focal length f of the curved reflective component 305 can meet 5mm <f<200mm。

[0047] The curved surface structure of the curved reflective component 305 can achieve the effect of converging light, so the curved reflective component 305 can allow more light to enter the human eye, thereby achieving the effect of improving the display brightness.

[0048] The curved reflective component 305 can only realize the reflection function, so that the optical module 300 can be applied to the VR system, so that the user of the VR system can see the virtual image. The curved reflective component 305 can also be a semi-transparent semi-reflective mirror, so that the external environment light enters the human eye through the curved reflective component 305 and the flat semi-transparent semi-reflective component 304, thereby realizing the fusion of the content displayed by the light source and the external environment, and then realizing the AR function.

[0049] The curved reflective component 103 may be an aspherical mirror, which is thinner and lighter, has better imaging effect, is conducive to improving the clarity and brightness of the imaging, and is also conducive to achieving lightweight optical modules.

[0050] In addition to the above-mentioned optical components, the optical module 300 may also include other optical components, which is not limited in the present application. For example, the optical module 300 may include a lens 302. The lens 302 may be arranged on the light-emitting side of the light source 500. The lens 302 may be a convex mirror for focusing or diffusion. For example, the convex mirror may diffuse the incident light emitted by the light source 500, so that the incident light is more evenly incident on the planar semi-transparent and semi-reflective component 304, so that the resolution of the light processing by the components on the subsequent optical path is higher, which is conducive to improving the fineness of the image received by the human eye.

[0051] The optical path of the optical module 300 is as follows Figure 3 The remaining light effect after the optical module 300 is calculated as follows.

[0052] The maximum reflectivity of the plane polarized reflection component 304 for linear polarized light with a vibration direction of the first direction is d%, and the transmittance of the linear polarized light with a vibration direction of the second direction is e%. The residual light effect of the light displayed by the light source 500 (when the light source 500 is a display screen, it is the original image displayed by the display screen) reaching the human eye is d%×e%. As can be seen from the above, d% and e% are both greater than 50%, so d%×e% is greater than 25%. Taking the application of the optical module 300 to an AR display device as an example, the curved reflection component 305 is a semi-transparent and semi-reflective mirror with a reflectivity of 50%. The residual light effect of the light displayed by the light source 500 reaching the human eye is d%×50%×e%, and d% and e% are both greater than 50%, so d%×50%×e% is greater than 12.5%.

[0053] The optical module proposed in the present application can make the residual light efficiency of the light displayed by the light source reaching the human eye higher, thereby reducing the display brightness of the light source, and can also reduce the energy consumption and heat generation of the optical module, thereby increasing the life of the optical module and reducing energy consumption.

[0054] It should be noted that the present application does not limit the specific structure of the plane polarized reflection component 304. For example, the plane polarized reflection component 304 can be a structure such as a polarized reflection film, a polarized reflection mirror, etc. Among them, the polarized reflection mirror can include a substrate and a polarized reflection film, and the polarized reflection film can be connected to the surface of the substrate. Alternatively, the plane polarized reflection component 304 can be a polarized reflection film, and the polarized reflection film can be connected to other optical components, for example, it can be connected to the second wave plate 303. Among them, the substrate can be a transparent flat plate, and can also be a plane semi-transparent semi-reflective mirror.

[0055] Optionally, the polarized reflective film may be a P-transmitting S-reflective film. The second wave plate 303 may be disposed on a surface of the plane polarized reflective component 304 close to the incident light. The arrangement may be, for example, a fixed arrangement, which may be, for example, contact fixing or non-contact fixing, that is, other components may be included between the plane polarized reflective component 304 and the second wave plate 303.

[0056] It should be noted that the plane polarization reflection component 304 is fixed on one side of the second wave plate 303, so that the plane polarization reflection component 304 and the second wave plate 303 have a supporting relationship, for example, the plane polarization reflection component 304 can support the second wave plate 303. Alternatively, the second wave plate 303 can support the plane polarization reflection component 304.

[0057] The present application does not limit the fixing or connection of the second wave plate 303 and the plane polarization reflection component 304. For example, the plane polarization reflection component 304 includes a substrate and a polarization reflection film, the second wave plate 303 can be a hard film or a soft film, and the second wave plate 303 can be fixed to the surface of the plane polarization reflection film or the substrate. In this case, the plane polarization reflection component 304 can provide support for the second wave plate 303. Alternatively, the plane polarization reflection component 304 is a soft film, the second wave plate 303 is a hard film, and the plane polarization reflection component 304 can be fixed to the surface of the second wave plate 303. In this case, the second wave plate 303 can provide support for the plane polarization reflection component 304.

[0058] It should be noted that the present application does not limit the specific fixing or connecting methods described above, as long as there is a supporting relationship between the fixed or connected components. The fixing or connecting method can be flexibly selected as needed, for example, it can be a surface bonding or evaporation coating method.

[0059] The present application fixes or connects the second wave plate to the plane polarization reflection component in the optical module, avoiding the need to attach the wave plate to the curved surface of the curved reflection component and also avoiding the need to provide an additional support device for the wave plate. This avoids complex process steps, simplifies the structure of the optical module, and reduces the volume of the optical module. When using a display device including an optical module, users can obtain a better user experience.

[0060] The element for incident light may include a display screen. Figure 3As shown, the second wave plate 303 has an angle α between the surface close to the display screen (i.e., the light source 500) and the display screen. Since the second wave plate 303 is fixedly connected to the plane polarization reflection component 304, the angle between the surface of the plane polarization reflection component 304 and the display screen is also α. The size of the angle α can meet 35°≤α≤65°. On the one hand, the setting of α can make the curved surface reflection component 305 receive as much light as possible, thereby further reflecting more light into the human eye, and then improving the display brightness of the image that the human eye can see. On the other hand, this can also further improve the supporting effect of the plane polarization reflection component 304 on the second wave plate 303, reduce the deformation or offset of the second wave plate 303 caused by the influence of gravity.

[0061] In order to adapt to α, the second wave plate 303 needs to be adjusted. The optical path difference between the wave plate and the o light and the e light is related to the distance the light propagates in the wave plate. When the light is incident on the wave plate vertically, the expected optical path difference can be generated. Since 35°≤α≤65°, the second light L2 is not incident on the second wave plate 303 vertically. Therefore, it is necessary to adjust the parameters of the second wave plate 303 so that the second wave plate 303 can produce a preset optical path difference for the light. The parameters of the second wave plate 303 can be, for example, the thickness of the second wave plate 303, or other parameters related to the optical path difference. For example, the first wave plate can be a 1 / 4 wave plate, and the second wave plate can be Wave plate, after the first light passes through the first wave plate and the second wave plate in sequence, a second light can be formed, the first light and the second light are both linearly polarized light, and the vibration direction of the second light is perpendicular to the vibration direction of the first light; after the second light passes through the second wave plate twice, a fourth light can be formed, the fourth light is also linearly polarized light, and the vibration direction of the fourth light is perpendicular to the vibration direction of the second light.

[0062] It should be noted that the present application does not limit the angle at which the second light is incident on the second wave plate. For example, the second light can be incident on the second wave plate at an angle of incidence β. Optionally, the angle of incidence β satisfies 35°≤β≤55°, and the second wave plate is set so that after the second light passes through the second wave plate twice, the phase difference between the o light and the e light is half a wavelength, that is, π.

[0063] The present application also proposes an optical system. The optical system includes a display screen, a left-eye lens assembly and a right-eye lens assembly located on the light source side of the display screen. The left-eye lens assembly and the right-eye lens assembly respectively include any one of the above-mentioned optical modules. Among them, the display screen is used to emit incident light received by the optical module to form an original image. The incident light enters the left eye and the right eye of the person through the left-eye lens assembly and the right-eye lens assembly respectively. Among them, the left-eye lens assembly and the right-eye lens assembly can transmit the same image to the human eye, or they can transmit different images. When the images transmitted to the human eye by the left-eye lens assembly and the right-eye lens assembly are different, a richer and more diverse display experience can be provided to the user.

[0064] The present application also provides a display device, including any one of the above optical modules. The display device may include a near-eye display device, such as a VR display device or an AR display device. For example, if the display device can independently implement the AR function, the display device includes an AR display device, and the display device can also independently implement the VR function, the display device includes a VR display device, or the display device can simultaneously implement the VR and AR functions, the display device includes a VR and AR display device.

[0065] The display device may include a housing, and the optical module is accommodated in the housing. The housing can isolate the optical module from the external environment, thereby protecting the optical module. The housing can also be used to fix the display device near the human eye, such as on the user's head, so that the user does not need to support the display device with his hands during use.

[0066] Optionally, the display device may further include a camera. For example, the camera may face the human eye to implement human eye detection or human eye tracking. The camera may also feed back the captured image to the display device to predict the user's state and needs and respond, thereby achieving the purpose of controlling the display device with glasses.

[0067] The present application also proposes a head-mounted display device, wherein the display device comprises any one of the above optical systems and a glasses frame. The glasses frame comprises temples, and the optical system is fixed between the temples. Such a head-mounted display device may also be referred to as a glasses-type display device.

[0068] The present application also proposes a head-mounted display device, wherein the display device comprises any one of the above optical systems and a buckle. The buckle is used to fix the optical system in front of the human eye. The present application does not limit the specific structure of the buckle, which may be, for example, a helmet-shaped, a strap-shaped, etc.

[0069] The present application also proposes a display system, which is a virtual reality and / or augmented reality (AR and / or VR) display system, and which includes a signal input device and any of the above head-mounted display devices. The signal input device is used to input a signal to the head-mounted display device. The head-mounted display device receives the signal from the signal input device and transmits it to the head-mounted display device for processing.

[0070] Among them, if the display system can independently realize the function of AR, then the display system includes an AR display system; the display system can also independently realize the function of VR, then the display system includes a VR display system; or, if the display system can simultaneously realize the functions of VR and AR, then the display system includes a VR and AR display system.

[0071] The present application does not limit the specific type of the signal input device. For example, the signal input device may be a sensor, and the sensor may include: a velocity sensor, an acceleration sensor or a vibration sensor, etc. Correspondingly, the signal input to the head-mounted display device may be a sensor signal such as a velocity signal, an acceleration signal, a vibration signal, etc. Alternatively, the signal input to the head-mounted display device may also be other signals generated based on the sensor signal. Specifically, the signal input device may include a handle controller for electrically connecting to the head-mounted display device. The user may control the head-mounted display device through the handle controller.

[0072] The present application does not limit the processing method of the head-mounted display device. For example, the processing can adjust the displayed content, displayed parameters, etc. according to the handle controller.

[0073] Optionally, the display system can be a virtual reality and / or augmented reality all-in-one machine, and the head-mounted display device is provided with an independent central processing unit. The central processing unit can be used to control the handle controller and display content. Based on this, the display system can perform calculations and processing independently without being connected to a PC.

[0074] Optionally, the above devices can all be intelligent display devices. The intelligent display device can implement intelligent processing, for example, it can run a neural network learning model, etc. The display screen can be a liquid crystal display screen or a LED display screen.

[0075] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical module, characterized in that: include: A first wave plate and a second wave plate, wherein the first wave plate and the second wave plate are both located on one side of the transmission direction of the incident light, the incident light includes a first light, the first light passes through the first wave plate and the second wave plate in sequence to form a second light, and the second light is linearly polarized light; A plane polarization reflection component, fixed on one side of the second wave plate, used for reflecting the second light to the second wave plate to obtain a third light; a curved reflective component, used for receiving the third light, and reflecting the third light to the second wave plate again to form a fourth light, wherein the fourth light is a linearly polarized light whose vibration direction is perpendicular to the vibration direction of the second light, and the fourth light is transmitted to the human eye through the plane polarized reflective component; The element providing the incident light comprises a display screen, and an angle α is formed between the second wave plate close to the surface of the display screen and the display screen, and the angle α satisfies 35°≤α≤65°; The first wave plate is a quarter wave plate, and the second wave plate is Wave plates; The angle between the first light and the display screen is less than 5°. When the first light passes through the first wave plate or the second wave plate, the first light is decomposed into light A and light B. After the first light passes through the first wave plate and the second wave plate, the phase difference between the light A and the light B is half a wavelength. The optical module further comprises a lens, which is arranged on the light-emitting side of the light-emitting source of the element providing the incident light, for focusing or diffusion.

2. The optical module according to claim 1, characterized in that: The first wave plate is arranged on a surface of the element providing the incident light at a light source exiting side, and the second wave plate is arranged on a surface of the plane polarization reflection component at a side close to the incident light.

3. The optical module according to claim 2, characterized in that: The plane polarized reflective component comprises a polarized reflective film, and the polarized reflective film is plated on the surface of the second wave plate away from the incident light.

4. The optical module according to claim 3, characterized in that: The plane polarized reflective component comprises a substrate and a polarized reflective film.

5. The optical module according to claim 4, characterized in that: The polarizing reflective film is used to reflect polarized light whose vibration direction is perpendicular to the incident plane and transmit polarized light whose vibration direction is parallel to the incident plane, wherein the incident plane is the plane where the light incident on the polarizing reflective film and the normal line of the polarizing reflective film surface are located.

6. The optical module according to claim 1, characterized in that: The second light ray is obliquely incident on the second wave plate at an incident angle β, and the incident angle β satisfies 35°≤β≤55°. When the second light ray passes through the second wave plate, the second light ray is decomposed into light ray A and light ray B. After the second light ray passes through the second wave plate twice, the phase difference between the light ray A and the light ray B is half a wavelength.

7. The optical module according to claim 1, characterized in that: The curved reflective component is concave toward the human eye in the vertical and horizontal directions, and the focal length f of the curved reflective component meets the following conditions: 5 mm <f<200mm。 8. The optical module according to claim 1, characterized in that: The curved surface reflection component is an aspherical mirror.

9. The optical module according to claim 1, characterized in that: The curved surface reflection component is a semi-transparent and semi-reflective mirror.

10. An optical system comprising a display screen, a left-eye lens assembly and a right-eye lens assembly located on a light source side of the display screen, characterized in that: The left-eye lens assembly and the right-eye lens assembly respectively include an optical module as described in any one of claims 1-9.

11. A display device, characterized in that: The display device comprises the optical system and housing as claimed in claim 10; Wherein, the optical system is accommodated in the housing.

12. The display device according to claim 11, characterized in that: The display device includes a VR display device and a camera, and the lens of the camera faces the human eye.

13. A head mounted display device, characterized in that: The head-mounted display device comprises the optical system and the eyeglass frame as claimed in claim 10; wherein the eyeglass frame comprises temples, and the optical system is fixed between the temples.

14. A head mounted display device, characterized in that: The head mounted display device comprises the optical system as claimed in claim 10 and a buckle member disposed therein, wherein the buckle member is used to fix the optical system in front of a person's eyes.

15. A display system, wherein the display system is a virtual reality and / or augmented reality display system, characterized in that: The display system includes a signal input device and a head-mounted display device as described in any one of claims 13-14, and the head-mounted display device receives the signal from the signal input device and transmits the signal to the head-mounted display device for processing.

16. The display system according to claim 15, characterized in that: The signal input device includes a handle controller for electrically connecting to the head mounted display device.

17. The display system according to claim 16, characterized in that: The display system includes a virtual and / or augmented reality display all-in-one machine, and the head-mounted display device is provided with an independent central processor for controlling the handle controller and displaying content.

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