WO2022068662A1

WO2022068662A1 - Display device module and head-mounted display device

Info

Publication number: WO2022068662A1
Application number: PCT/CN2021/119805
Authority: WO
Inventors: 杨帆; 戴杰
Original assignee: 华为技术有限公司
Priority date: 2020-09-30
Filing date: 2021-09-23
Publication date: 2022-04-07
Also published as: CN114326111A

Abstract

A display device module, comprising a display panel (301), a non-coaxial optical device (302), a first sheet-shaped optical element (303) and a fixing system, wherein the display panel (301) is used for emitting light; a light incident surface (3022) of the non-coaxial optical device (302) enables light emitted by the display panel (301) to be transmitted through the light incident surface (3022) and to be transmitted out from a light emitting surface (3024); and one side, facing the non-coaxial optical device (302), of the first sheet-shaped optical element (303) is used for reflecting light transmitted by the light emitting surface (3024) in the direction of the human eye, and the first sheet-shaped optical element (303) is further used for providing focal power which is deflected towards the non-coaxial optical device (302) when the light is reflected. The first sheet-shaped optical element (303) can provide the focal power which is deflected towards the non-coaxial optical device (302) so as to reflect light in the direction of the human eye, such that the display device module can only comprise a single sheet-shaped optical element, thereby reducing the thickness of the display device module.

Description

A display device module and head-mounted display device

This application claims the priority of the Chinese patent application with the application number 202011066519.1 and the application name "A display device module and head-mounted display device", which was submitted to the State Intellectual Property Office of China on September 30, 2020, the entire contents of which are Incorporated herein by reference.

technical field

The present application relates to the field of optics, and in particular, to a display device module and a head-mounted display device.

Background technique

The head-mounted display device can use the additional information generated by the computer to enhance or expand the real world scene seen by the user, which has greatly changed the way humans interact with the computer or the external world. A variety of technologies in the research field, and soon applied to entertainment, scientific research, simulation training, telemedicine and other fields.

In head-mounted display devices based on augmented reality (AR) and mixed reality (MR) technologies, the virtual image displayed by the display panel needs to be processed by the display device module first, and then superimposed with the real image and presented to the user. Since the head-mounted display device is worn on the user's head, in order to reduce the pressure on the user's head, further compact design of the head-mounted display device is required.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a head-mounted display device, so that the thickness of the display device module in the head-mounted display device in the direction of the human eye line of sight is reduced, thereby realizing a compact design of the head-mounted display device.

In a first aspect, the present application provides a display device module, which is characterized by comprising a display panel, a non-coaxial optical device, a first sheet-like optical element, and a fixing system; the fixing system is used to fix the display panel , the non-coaxial optical device and the first sheet optical element;

The display panel is used to emit light based on the electronic image content; the display panel can display images based on the electronic image content, and further, can be used as a light source to emit light based on the electronic image content;

The non-coaxial optical device includes a light incident surface and a light exit surface, and the light incident surface of the non-coaxial optical device faces the display panel, so that the light emitted by the display panel can be transmitted through the light incident surface, and the transmitted from the light-emitting surface;

It should be understood that the non-coaxial optical device may be a free-form surface prism or a composite structure composed of multiple lenses, which is not limited in this application; the "transmission" in this embodiment can be understood as the exit of the incident light after passing through the object Phenomenon. Among them, when light is incident on the surface of a transparent or translucent material, part of it is reflected, part of it is absorbed, and part of it can be transmitted;

The side of the first sheet-like optical element facing the non-coaxial optical device is used to reflect the light transmitted from the light-emitting surface to the direction of the human eye, and is used to form a virtual image corresponding to the electronic image content. The first sheet-like optical element is also used to provide optical power that is deflected to the non-coaxial optical system when light is reflected. Among them, the direction of the human eye can be understood as the direction of the human eye when the user wears the AR or MR glasses in the correct way. It should be understood that the AR and MR glasses include a left-eye display module and a right-eye display module, and the left-eye display module The human eye direction of the group can refer to the direction of the left eye when the user wears the AR or MR glasses in the correct way; the human eye direction of the right eye display module can refer to the right eye when the user wears the AR or MR glasses in the correct way. the direction in which it is located;

Wherein, the first sheet-shaped optical element can provide the optical power that is deviated to the non-coaxial optical system, so as to reflect the light to the direction of the human eye, so that the display device module can only include a single sheet-shaped optical element, reducing the display The thickness of the device module.

In a possible implementation, a surface of the first sheet-like optical element facing the non-coaxial optical device is provided with a reflective diffraction grating, and the reflective diffraction grating is used to reflect the light transmitted from the light exit surface to the direction of the human eye, and provide a power that is deflected toward the non-coaxial optical system when light is reflected.

During operation, the light of the display panel can enter the interior of the non-coaxial optical device, be reflected by the reflective surface, and propagate to the reflective diffraction grating of the first sheet optical element below through the exit surface. The reflective diffraction is performed, and the diffracted light generated finally enters the human eye, and the user can see the display image. The first sheet-shaped optical element 303 is a light-transmitting material, so that ambient light can pass through the first sheet-shaped optical element and enter the human eye, so that the user can simultaneously see the environment without distortion, forming an AR display. Since the first sheet-shaped optical element is provided with a reflective diffraction grating, it can provide the optical power that is deviated to the non-coaxial optical device, so that the display device module can only include a single first sheet-shaped optical element, which reduces the reduction of display equipment. The thickness of the module. At the same time, the ambient light only passes through the single-piece first sheet-like optical element in the process of being transmitted from the environment to the human eye, so that the ambient light only undergoes energy attenuation once, and the apparent light transmission effect is improved.

In a possible implementation, a Fresnel lens is further arranged inside the first sheet-like optical element, and the surface of the Fresnel lens facing the non-coaxial optical device is used to reflect the light-emitting surface and transmit light. The light is directed towards the human eye, and when reflecting the light, it provides a power that is deflected toward the non-coaxial optical system.

During operation, the light of the display panel can enter the interior of the non-coaxial optical device, be reflected by the reflective surface, and propagate to the Fresnel lens in the first sheet optical element below through the exit surface. After the reflection of the lens enters the human eye, the user can see the display image of the display panel. At the same time, the ambient light enters the human eye through the first sheet-like optical element, so that the user can see the undistorted environment at the same time, forming an AR display; since the first sheet-like optical element is provided with a Fresnel lens, it can provide deflection non-destructive The optical power of the coaxial optical device enables the display device module to only include a single first sheet optical element, which reduces the thickness of the display device module. At the same time, the ambient light is transmitted from the environment to the human eye during the process. Only through the single-piece first sheet-like optical element, the ambient light is only attenuated once in energy, and the apparent light transmission effect is improved.

In a possible implementation, the included angle between the first sheet-like optical element and the direction of the human eye is greater than 45 degrees and less than 90 degrees. When the user wears the head-mounted display device correctly, the angle between the first sheet-like optical element and the plumb direction may be less than 45 degrees, that is to say, when the user wears the head-mounted display device correctly, the first sheet-like optical element Elements are not tilted excessively. The first sheet-like optical element may be a sheet-like optical structure with a surface having a certain curvature, or a flat-plate-like optical structure. If the first sheet-like optical element is a sheet-like optical structure with a surface with a certain curvature, the angle between the first sheet-like optical element and the direction of the human eye can be understood as the plane where the first sheet-like optical element is roughly located and the human eye. The angle between the directions of the eye, or the angle between the majority of the surface of the first sheet-like optical element and the direction of the human eye.

In a possible implementation, the difference in thickness of the first sheet-shaped optical element is within a preset range; the thickness of the first sheet-shaped optical element is within a range of 0.3 mm to 3 mm.

In a possible implementation, the first sheet-like optical element is a light-transmitting material for transmitting ambient light.

In a possible implementation, a side of the reflective diffraction grating facing the non-coaxial optical device includes a protrusion, and the protrusion is biased toward the non-coaxial optical device. The inclination angle range of the protrusions may be less than 45 degrees, and the protrusions of the inclined structure can enhance the efficiency of positive-order diffraction.

In a possible implementation, an enhanced reflection film is provided on the surface of the reflective diffraction grating. Enhanced reflective coatings can be used to control the ratio of reflection to apparent transmission.

In a possible implementation, the reflective diffraction grating includes one of a relief grating, a straight diffraction grating, a blazed grating and a volume holographic grating.

In a possible implementation, the surface of the Fresnel lens is provided with a semi-reflective and semi-transparent film.

In a possible implementation, a transparent adhesive layer is provided on the surface of the partially reflective film, and the difference between the refractive indices of the transparent adhesive layer and the Fresnel lens is within a preset range. The surface of the Fresnel lens is provided with a semi-reflective and semi-transparent film, which is used to control the ratio of reflection to apparent transmission. The surface of the Fresnel lens on the side of the human eye can also be attached with an optically transparent adhesive layer, and the difference between the refractive indices of the transparent adhesive layer and the Fresnel lens is within a preset range, which can be used as perspective compensation The refractive index of the adhesive layer is similar to the refractive index of the lens, and the preset range of the difference between the refractive indices of the transparent adhesive layer and the Fresnel lens may be 0.05. It should be understood that this application does not limit the material type of the adhesive layer, as long as the transmittance is higher than 90% in the visible light band, and the difference between the refractive index and the Fresnel lens is within a preset range.

In a possible implementation, the non-coaxial optical system further includes: at least one reflection surface;

The at least one reflective surface is disposed between the light incident surface and the light emitting surface, so that the light transmitted by the light incident surface can be reflected by the at least one reflective surface and transmitted from the light emitting surface.

In a second aspect, the present application also provides a head-mounted display device, the head-mounted display device is an augmented reality AR device or a mixed reality MR device, including: a left eye display module, a right eye display module, a middle shell and temples;

The middle shell is used to fix the left-eye display module, the right-eye display module and the temple, and the left-eye display module or the right-eye display module includes any of the above-mentioned first aspect. 1. The display device module.

In a possible implementation, it also includes: a front shell;

The front case is connected to the middle case, and the front case is located on the outer surface of the head-mounted display device and is used for protecting the left-eye display module and the right-eye display module.

In a possible implementation, the front case includes a first surface, and the first surface faces away from the left-eye display module and the right-eye display module, and the light-emitting surface of the non-coaxial optical device The transmitted light is directed towards the first surface.

In a possible implementation, the included angle between the first sheet-like optical element and the first surface is less than 45 degrees.

In a possible implementation, the first sheet-like optical element includes a first end and a second end, and the first end is an end of the first sheet-like optical element that is close to the non-coaxial optical device , the second end is the end of the first sheet optical element away from the non-coaxial optical device, and the distance between the first end and the first surface is smaller than the distance between the second end and the first surface distance from a surface.

An embodiment of the present application provides a display device module, including a display panel, a non-coaxial optical device, a first sheet-like optical element, and a fixing system; the fixing system is used to fix the display panel, the non-coaxial optical device an optical device and the first sheet-like optical element; the display panel is used for emitting light based on electronic image content; the non-coaxial optical device includes a light incident surface and a light exit surface, the light incident of the non-coaxial optical device facing the display panel, so that the light emitted by the display panel can be transmitted through the light incident surface and transmitted from the light exit surface; the first sheet-shaped optical element faces the non-coaxial optical device. One side is used to reflect the light transmitted from the light emitting surface to the direction of the human eye, and is used to form a virtual image corresponding to the content of the electronic image, and the first sheet-shaped optical element is also used to provide a deflection of the light when reflecting the light. The optical power of a non-coaxial optical system. In the embodiment of the present application, the first sheet-shaped optical element can provide a refractive power that is biased toward the non-coaxial optical system, so as to reflect the light to the direction of the human eye, so that the display device module can only include a single sheet-shaped optical element, Reduced thickness of display device mods.

Description of drawings

1 is a schematic diagram of a head-mounted display device worn by a user;

2 is a schematic diagram of a head-mounted display device;

3a is a schematic structural diagram of a display device module according to an embodiment of the application;

3b is a schematic structural diagram of a display device module according to an embodiment of the application;

3c is a schematic structural diagram of a display device module according to an embodiment of the present application;

3d is a schematic structural diagram of a display device module according to an embodiment of the application;

3e is a schematic structural diagram of a display device module according to an embodiment of the application;

3f is a schematic structural diagram of a display device module provided by an embodiment of the application;

3g is a schematic structural diagram of a display device module provided by an embodiment of the application;

3h is a schematic structural diagram of a display device module provided by an embodiment of the application;

FIG. 4 is a schematic structural diagram of a display device module according to an embodiment of the present application.

Detailed ways

The embodiments of the present application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Those of ordinary skill in the art know that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

The terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or modules is not necessarily limited to those expressly listed Rather, those steps or modules may include other steps or modules not expressly listed or inherent to the process, method, product or apparatus. The naming or numbering of the steps in this application does not mean that the steps in the method flow must be executed according to the time or logical sequence indicated by the naming or numbering, and the named or numbered process steps can be implemented according to the The technical purpose is to change the execution order, as long as the same or similar technical effects can be achieved.

FIG. 1 shows a schematic diagram of a head mounted display device 100 worn by a user 102 . The head mounted display device 100 may be used to display augmented reality images as well as physical objects in a real world background scene. The head mounted display device 100 may include a frame 104 (also referred to in this embodiment as a frame or frame) for positioning the device at a target viewing position relative to the eyes of the user 102 .

FIG. 2 shows a schematic diagram of the head mounted display device 100 of FIG. 1. As shown in FIG. 2, the head mounted display device 100 includes a right eye display system 200a and a left eye display system 200b. The right eye display system 200a or the left eye display system 200b) can be used to both display virtual images to the user and allow the user to view the real environment. The right-eye display system 200a may include a right-eye display module, the left-eye display system 200b may include a left-eye display module, and the head-mounted display device 100 may further include a middle shell and temples (or earpieces) 206, the middle case is used to fix the left-eye display module, the right-eye display module and the temple 206, the head-mounted display device 100 further includes a front case, the front case and the The middle shell is connected, and the front shell is located on the outer surface of the head-mounted display device, and is used for protecting the left-eye display module and the right-eye display module. It should be understood that the front case may be a transparent visor.

Furthermore, Figure 2 schematically illustrates a microphone 202 that may be used to output acoustic information to a user. Such acoustic information may take any suitable form, including, but not limited to, computer-generated speech output in an appropriate language (as selected by the user), tones or other sounds not specific to any language, and/or any other suitable sounds. In some embodiments, other types of output may be provided by the head mounted display device 100, such as haptic/touch output.

Left eye display system 200b and right eye display system 200a may be positioned at viewing positions relative to the eye via one or more fastening mechanisms of frame 104 . For example, as shown in FIG. 2 , the frame 104 may be supported by the user's ears via earpieces 206 and by the user's nose via the nose bridge 208 to reduce sliding of the frame 104 . It will be appreciated that the supports (eg, earpiece 206, nosepiece, and bridge 208) shown in FIG. 2 are exemplary in nature and that the see-through display systems of the head-mounted see-through display device (right eye display system 200a and left eye Display system 200b) may be positioned at the viewing location via any suitable mechanism. For example, additional supports may be utilized, and/or one or more of the supports shown in FIG. 2 may be removed, replaced, and/or augmented to position the see-through display system at the viewing location. Furthermore, the see-through display system may be positioned at the viewing location by a mechanism other than a support that physically contacts the user, which is not a limitation of the present application.

It should be understood that the left-eye display module and the right-eye display module in this embodiment may be referred to as display device modules.

Turning now to FIG. 3 a , FIG. 3 a is a schematic structural diagram of a display device module provided by an embodiment of the application. Specifically, the display device module shown in FIG. 3 a may be the left-eye display system 200 b or the right-eye display system in FIG. 2 . A component of the system 200a, the display device module shown in FIG. 3a can be a left-eye display module in the left-eye display system 200b or a right-eye display module in the right-eye display system 200a, as shown in FIG. 3a , the display device module provided in this application may include: a display panel 301 , a non-coaxial optical device 302 , a first sheet-shaped optical element 303 and a fixing system.

In this embodiment of the present application, the display panel 301 may include any suitable components for generating an image for display, including but not limited to a microdisplay and one or more light sources.

Optionally, in some embodiments, the display panel 301 may include a reflective microdisplay, such as a liquid crystal on silicon (LCoS) display. In other embodiments, the display panel 301 may comprise an emissive microdisplay, such as an organic light-emitting diode (OLED) array display type, an inorganic light-emitting diode (iLED) array display type, and/or or any other suitable microdisplay. Display panel 301 may include one or more light sources, such as an array of RGB LEDs, one or more white LEDs (eg, with a color filter arrangement), and/or any suitable lighting source structure.

In this embodiment of the present application, the display panel 301 can display an image based on the content of the electronic image, and further, can be used as a light source to emit light based on the content of the electronic image.

Optionally, in the embodiment of the present application, the fixing system may include a housing, a bearing surface, a connecting piece, a V-shaped groove, and other mechanical structures, or materials used for fixing or connecting.

In this embodiment, each element included in the display device module can be fixed at the corresponding position by setting the fixing system. For example, the fixing system may include a bearing surface and a casing of the head-mounted display device, the side of the display panel 301 facing away from the light-emitting surface may be a bearing surface, and the display panel 301 may communicate with the head-mounted display device through the aforementioned bearing surface. The housing is fixedly connected.

Optionally, in this embodiment of the present application, the non-coaxial optical device 302 may be fixed to the display panel 301 through a fixing system.

In this embodiment, the display panel 301 and the non-coaxial optical device 302 can be fixedly connected through the setting of the fixing system. to directly connect the display panel 301 and the non-coaxial optical device 302; the fixing system can also be the shell of the head-mounted display device, the display panel 301 is fixedly connected to the shell, and the non-coaxial optical device 302 is fixedly connected to the shell, which is equivalent to passing The housing is used to indirectly connect the display panel 301 with the non-coaxial optics 302 .

In the embodiment of the present application, the non-coaxial optical device 302 may include a light incident surface 3022 and a light exit surface 3024, and the light incident surface 3022 of the non-coaxial optical device 302 faces the display panel 301, so that the display panel The light emitted by 301 can be transmitted through the light incident surface 3022 and transmitted from the light exit surface 3024 .

It should be understood that the "transmission" in this embodiment can be understood as the exit phenomenon after the incident light passes through the object. Among them, when light is incident on the surface of a transparent or translucent material, part of it is reflected, part of it is absorbed, and part of it can be transmitted.

It should be understood that the non-coaxial optical device 302 may be a free-form curved prism, or a combined structure composed of multiple lenses, which is not limited in this application.

As shown in FIG. 3 a , the non-coaxial optical device 302 may include a light incident surface 3022 , a first reflecting surface 3025 , a second reflecting surface 3021 and a light exit surface 3024 , and the light incident surface 3022 of the non-coaxial optical device 302 toward the display panel 301, so that the light emitted by the display panel 301 can be transmitted through the light incident surface 3022, and reflected between the first reflection surface 3025 and the second reflection surface 3021, from the The light-emitting surface 3024 is transmitted out.

It should be understood that, in this embodiment, only the non-coaxial optical device 302 including the first reflection surface 3025 and the second reflection surface 3021 is used as an example for description. It should be noted that the number of reflective surfaces included in the non-coaxial optical device 302 may be greater than 2, equal to 2, or less than 2, which is not limited in this application.

Optionally, in the embodiment of the present application, as shown in FIG. 3 b , the distance L8 between the display panel 301 and the light incident surface 3022 of the non-coaxial optical device 302 may be in the range of 0.1 mm to 1 mm.

In this embodiment of the present application, the non-coaxial optical device 302 may include at least three surfaces, and each surface may be, but not limited to, non-planar and aspherical. For example, the non-coaxial optical device 302 may include a first reflection surface 3025 , a second reflection surface 3021 , a light entrance surface 3022 and a light exit surface 3024 . The light emitting surface 3024 is the lower end surface of the non-coaxial optical device 302, the light emitting surface 3024 can be a non-rotationally symmetrical transmission surface, and the edge of the light emitting surface 3024 is bent from the air to the non-coaxial optical device 302, which can reduce the incidence of principal rays The angle is good for aberration correction. The light incident surface 3022 is the upper end surface of the non-coaxial optical device 302, and the light incident surface 3022 may be a non-rotationally symmetrical transmission surface.

In the embodiment of the present application, the second reflective surface 3021 may be an end surface of the non-coaxial optical device 302. When the user wears the head-mounted display device, the second reflective surface 3021 may face away from the human eye, and is a non-coaxial optical device On the outer side of the 302, the second reflective surface 3021 may be a non-rotationally symmetrical reflective surface. In the embodiment of the present application, the light from the display panel 301 travels along the display optical path, and enters the non-coaxial optical device 302 after passing through the light incident surface 3022. , through the reflection between the first reflection surface 3025 and the second reflection surface 3021 , and finally through the reflection of the second reflection surface 3021 , and transmits from the light exit surface 3024 .

It should be noted that, in the embodiment of the present application, the first reflective surface 3025 and the second reflective surface 3021 of the non-coaxial optical device 302 may be coated with a reflective film. In this case, the first reflective surface 3025 of the non-coaxial optical device 302 And the second reflecting surface 3021 can reflect all the incident light.

It should be noted that, in the implementation of the present application, the non-coaxial optical device 302 may include multiple reflective surfaces, and the light emitted by the display panel 301 enters the non-coaxial optical device 302 after being transmitted through the incident surface of the non-coaxial optical device 302 . The non-coaxial optical device 302 is transmitted from the light-emitting surface 3024 after being folded by a plurality of reflective surfaces inside, and the number of the reflective surfaces is not limited in the present application.

Optionally, in the embodiment of the present application, as shown in FIG. 3b, the display device module provided in the embodiment of the present application may be arranged in the lens of the head-mounted display device (AR or MR glasses), and the non-coaxial The width L7 of the optical device 302 in the direct line of sight of the human eye can be in the range of 3mm to 15mm. It should be understood that the above-mentioned direct line of sight of the human eye means that when the user wears the AR or MR glasses in a correct way, the human eye looks straight. direction of sight.

In the embodiment of the present application, when the user wears the head-mounted display device, the light from the display panel 301 can travel along the display light path, pass through the non-coaxial optical device 302 and the first sheet-shaped optical element 303 in sequence, and propagate toward the human eye. , and then reach the human eye.

The direction of the human eye in this embodiment can be understood as the direction of the human eye when the user wears the AR or MR glasses in the correct way. It should be understood that the AR and MR glasses include a left-eye display module and a right-eye display module. The human eye direction of the eye display module can refer to the direction of the left eye when the user wears the AR or MR glasses in the correct way; the human eye direction of the right eye display module can refer to the user wearing the AR or MR glasses in the correct way. , the direction of the right eye.

In this embodiment, the first sheet-shaped optical element 303 and the non-coaxial optical device 302 can be fixedly connected through the setting of the fixing system, and the fixing system can be located between the first sheet-shaped optical element 303 and the non-coaxial optical device 302 The first sheet-like optical element 303 and the non-coaxial optical device 302 are directly connected through the connecting piece; the fixing system can also be the casing of the head-mounted display device, and the first sheet-like optical element 303 is fixed to the casing. For connection, the non-coaxial optical device 302 is fixedly connected to the housing, which is equivalent to indirectly connecting the first sheet optical element 303 and the non-coaxial optical device 302 through the housing.

Optionally, in the embodiment of the present application, the fixing system may include a V-shaped groove, and the first sheet-shaped optical element 303 may be connected to the non-coaxial optical device 302 by positioning the V-shaped groove, and the first sheet-shaped optical element 303 can also be fixedly connected to the non-coaxial optical device 302 by extending a bearing surface outside the light-transmitting area, and then by means of the bearing surface.

It should be noted that the above-mentioned fixing method of the optical element is only an example, and does not constitute a limitation to the present application.

In the embodiment of the present application, the first sheet-like optical element 303 can be used to reflect the light transmitted from the light exit surface 3024 , and the first sheet-like optical element 303 faces the side of the non-coaxial optical device 302 A reflective diffraction grating or a Fresnel lens may be provided to provide the optical power deflected to the non-coaxial optical device 302 when the first sheet-shaped optical element 303 reflects light.

Next, the position of the first sheet-like optical element 303 in the head-mounted display device will be described.

In the embodiment of the present application, the first sheet-like optical element 303 may be located in the area in front of the human eye when the user wears the AR or MR glasses in a correct manner. In a possible implementation, the non-coaxial optical element 302 and all The human eye is located on the same side of the first sheet-like optical element 303. The first sheet-like optical element 303 may include

opposite surfaces

4001 and 4002. When the user wears the head-mounted display device correctly, the surface 4001 may In order to be away from the surface of the first sheet-like optical element 303 that faces the human eye, that is, the surface of the first sheet-like optical element 303 that faces the ambient side, the surface 4002 can be the surface of the first sheet-like optical element 303 that faces the human eye, so The non-coaxial optical device 302 and the human eye may be located in the area where the upper surface 4002 of the first sheet-like optical element 303 faces.

As shown in FIG. 3b, the first sheet-like optical element 303 may include

opposite surfaces

4001 and 4002, and when the user wears the head-mounted display device correctly, the surface 4001 may be the first sheet-like optical element away from the human eye The surface of 303, that is, the surface of the first sheet-like optical element 303 facing the environment side, the surface 4002 can be the surface of the first sheet-like optical element 303 facing the human eye, and the light-emitting surface 3024 of the non-coaxial optical device 302 transmits the The light of the ray is directed to the environment side, and after being reflected by the first sheet-like optical element 303, the propagation direction of the light is changed to the direction of the human eye. In other words, after being reflected by the first sheet-like optical element 303, The propagation direction of the light is changed to the direction of the human eye, which is the direction of the human eye when the user wears the AR or MR glasses in the correct way.

In a possible implementation, the included angle between the first sheet-like optical element 303 and the direction of the human eye is greater than 45 degrees and less than 90 degrees.

In this embodiment of the present application, when the user is wearing the head-mounted display device correctly, the angle between the first sheet-shaped optical element 303 and the plumb direction may be less than 45 degrees, that is to say, the user is wearing the head-mounted display device correctly. , the first sheet-like optical element 303 will not be excessively inclined.

In the embodiment of the present application, the first sheet-like optical element 303 may be a sheet-like optical structure with a surface having a certain curvature, or a flat-plate-like optical structure. If the first sheet-like optical element 303 is a sheet-like optical structure with a certain curvature on the surface, the angle between the first sheet-like optical element 303 and the direction of the human eye can be understood as the approximate position where the first sheet-like optical element 303 is located. The angle between the plane and the direction of the human eye, or the angle between most of the surface of the first sheet-like optical element 303 and the direction of the human eye. Exemplarily, as shown in FIG. 3c, the included angle between the first sheet-like optical element 303 and the direction of the human eye is θ1, and θ1 may be greater than 45 degrees and less than 90 degrees.

In this embodiment of the present application, the display device module may be disposed in a head-mounted display device, the head-mounted display device may include an augmented reality AR device or a mixed reality MR device, and the head-mounted display device may include a left-eye display module, The right eye display module, the middle shell and the front shell 400, the left eye display module and the right eye display module are all fixed on the middle shell, and the front shell 400 is located on the outer surface of the head-mounted display device, For protecting the left-eye display module and the right-eye display module, the front case may include a first surface 4005, and the first surface 4005 is the surface on the head-mounted display device facing away from the direction of the human eye , the light transmitted from the light-emitting surface of the non-coaxial optical device 302 faces the first surface 4005 .

3c, when the user wears the head-mounted display device correctly, the first surface 4001 may be the surface of the front case away from the human eye, that is, the surface of the head-mounted display device facing the environment side. When the light transmitted by the light-emitting surface 3024 of the non-coaxial optical system 302 is not reflected by the target optical element 303, the propagation direction of the light is toward the first surface 4001, and after being reflected by the target optical element 303, the light propagates The direction is changed to face the human eye.

In a possible implementation, the included angle between the target optical element 303 and the first surface 4005 is less than 45 degrees.

As shown in FIG. 3 c , in this embodiment of the present application, the first sheet-like optical element 303 may include a first end 4003 and a second end 4004 , and the first end 4003 is on the first sheet-like optical element 303 The end close to the non-coaxial optical device 302, the second end 4004 is the end of the first sheet-shaped optical element 303 far away from the non-coaxial optical device 302, the first end 4003 and the The distance between the first surface 4005 is smaller than the distance between the second end 4004 and the first surface 4005 .

In this embodiment of the present application, when the user wears the head-mounted display device correctly, the length L2 of the first sheet-shaped optical element 303 along the plumb direction may be between 20 mm and 40 mm, and the length L1 along the line of sight of the user may be between 20 mm and 40 mm. Between 1mm and 20mm, the closest distance L6 between the user's glasses and the first sheet-like optical element 303 may be between 10mm and 20mm.

In the embodiment of the present application, the first sheet-like optical element 303 may be an off-axis free-form surface lens, and the first sheet-like optical element 303 may be a thin glass or plastic transparent medium with non-rotational symmetry.

In a possible implementation, the difference in thickness of the first sheet-shaped optical element 303 is within a preset range, and the thickness L3 of the first sheet-shaped optical element 303 is between 0.3 mm and 3 mm. within the range.

In the embodiment of the present application, the first sheet-like optical element 303 can be used to reflect the light transmitted from the light-emitting surface 3024 to the human eye, and the first sheet-like optical element 303 is used to provide a deflection angle when reflecting the light. the optical power of the non-coaxial optical device 302.

In one implementation, when reflecting light, the first sheet-like optical element 303 can provide an angular deflection that is greater than 0 degrees and less than 30 degrees toward the non-coaxial optical device 302 compared to plane reflection.

In this embodiment of the present application, a reflective diffraction grating or a Fresnel lens may be disposed on the side of the first sheet-like optical element 303 facing the non-coaxial optical device 302 to provide the first sheet-like optical element 303 provides optical power that is deflected toward the non-coaxial optics 302 when light is reflected.

In one implementation, when the user wears the head-mounted display device correctly, a reflective diffraction grating may be provided on the surface of the first sheet-like optical element 303 near the human eye, for example, the reflective diffraction grating may be a one-dimensional diffraction structure . The light projected by the light-emitting surface 3024 of the non-coaxial optical device 302 can generate reflective diffraction through the diffraction surface of the reflective diffraction grating on the first sheet-shaped optical element 303, so that the light reflected from the first sheet-shaped optical element 303 The focal power is larger than the focal power reflected by the plane mirror. Specifically, referring to FIG. 3d, the light R1 projected by the light-emitting surface 3024 of the non-coaxial optical device 302 passes through the reflection on the first sheet-shaped optical element 303. The reflection angle behind the diffraction surface of the diffraction grating is θ2, which is smaller than the reflection angle of the light reflected by the plane mirror (the dotted line after the R1 light reflected by the first sheet optical element 303 shown in FIG. 3d ), and the light R0 is similar.

Optionally, the reflective diffraction grating may be an embossed grating, a straight diffraction grating, a blazed grating or a volume holographic grating and other structures that can cause diffraction phenomena. In one implementation, the reflective diffraction grating may include protrusions 402 that slope toward the non-coaxial optics 302 .

Exemplarily, the cross section of the reflective diffraction grating in this embodiment may be as shown in FIG. 3e , the reflective diffraction grating may be an inclined relief grating, the protrusions 402 may be deflected toward the upper non-coaxial optical device 302 , and the inclination of the protrusions 402 The angle range can be less than 45 degrees, and the effect of the inclined structure is to enhance the efficiency of the positive order diffraction.

Optionally, in one implementation, the reflective diffraction grating may be coated with an enhanced reflective film 401, and the enhanced reflective film 401 may be used to control the ratio of reflection to apparent transmittance, and the surface of the reflective diffraction grating away from the human eye may be optical. The transmission surface is coated with anti-reflection coating.

During operation, the light of the display panel 301 can enter the interior of the non-coaxial optical device 302, be reflected by the reflective surface, and propagate to the reflective diffraction grating of the first sheet-like optical element 303 below through the exit surface. The diffraction grating performs reflective diffraction, and the generated diffracted light finally enters the human eye, and the user can see the displayed image. The first sheet-shaped optical element 303 is a light-transmitting material, so that ambient light can pass through the first sheet-shaped optical element 303 and enter the human eye, so that the user can simultaneously see the environment without distortion, forming an AR display.

In the embodiment of the present application, when the target element is a sheet-like structure with a curvature on the surface, the surface curvature of the reflective diffraction grating and the target element can jointly provide the optical power of the display device module. In the embodiment of the present application, when the target element is a flat plate structure, the reflective diffraction grating can provide the optical power of the display device module.

In the embodiment of the present application, since the first sheet-shaped optical element 303 is provided with a reflective diffraction grating, the optical power that is biased toward the non-coaxial optical element 302 can be provided, so that the display device module can only include the first sheet of a single sheet The shape of the optical element 303 reduces the thickness of the display device module. At the same time, the ambient light only passes through the single-piece first sheet optical element 303 in the process of being transmitted from the environment to the human eye, so that the ambient light only undergoes energy attenuation once, which improves the apparent light transmission effect. For details, please refer to FIG. 3g , if the ambient light needs to pass through two optical elements, there will be two energy attenuations (one attenuation is 50%, and one attenuation is 25%).

In one implementation, when the user wears the head-mounted display device correctly, a Fresnel lens may be provided on the surface of the first sheet-like optical element 303 on the side close to the human eye for providing the first sheet-like optical element 303 with a Fresnel lens. 303 provides optical power that is deflected toward the non-coaxial optics 302 when light is reflected.

Optionally, the base material of the Fresnel lens can be thin glass or plastic transparent medium. When the user wears the head-mounted display device correctly, the Fresnel tooth surface 403 of the Fresnel lens is close to the side of the human eye, and the tooth surface is 403 are all inclined toward the upper non-coaxial optical device 302 , so that the Fresnel lens can provide optical power that is deflected to the non-coaxial optical device 302 when reflecting light for the first sheet-shaped optical element 303 . The thickness of the Fresnel lens can range from 0.3 to 3 mm.

Specifically, referring to FIG. 3f , when the user wears the head-mounted display device correctly, the Fresnel tooth surface 403 of the Fresnel lens is close to the side of the human eye, and the tooth surfaces 403 are all directed toward the non-coaxial optical device 302 which is upward. .

In a possible implementation, the surface of the Fresnel lens is provided with a semi-reflective and semi-transparent film, which is used to control the ratio of reflection to apparent transmission. The surface of the Fresnel lens on the side of the human eye can also be attached with an optically transparent adhesive layer, and the difference between the refractive indices of the transparent adhesive layer and the Fresnel lens is within a preset range, which can be used as perspective compensation The refractive index of the adhesive layer is similar to the refractive index of the lens, and the preset range of the difference between the refractive indices of the transparent adhesive layer and the Fresnel lens may be 0.05. It should be understood that this application does not limit the material type of the adhesive layer, as long as the transmittance is higher than 90% in the visible light band, and the difference between the refractive index and the Fresnel lens is within a preset range.

During operation, the light of the display panel 301 can enter the interior of the non-coaxial optical device 302, be reflected by the reflective surface, and propagate to the Fresnel lens in the first sheet-shaped optical element 303 below through the exit surface. The reflection of the Fresnel lens enters the human eye, and the user can see the display image of the display panel 301 . At the same time, ambient light passes through the first sheet optical element 303 and enters the human eye, so that the user can simultaneously see the environment without distortion, forming an AR display.

In the embodiment of the present application, since the first sheet-shaped optical element 303 is provided with a Fresnel lens, it can provide the optical power that is biased toward the non-coaxial optical element 302, so that the display device module can only include the first sheet of a single sheet The thin optical element 303 reduces the thickness of the display device module. At the same time, the ambient light only passes through the single first sheet optical element 303 during the process of spreading from the environment to the human eye, so that the ambient light only undergoes energy attenuation once. Improves the visual transmittance.

In addition, as shown in FIG. 4 , FIG. 4 is a schematic diagram of a display device module provided by an embodiment of the present application.

An embodiment of the present application provides a display device module, including a display panel, a non-coaxial optical device, a first sheet-like optical element, and a fixing system; the fixing system is used to fix the display panel, the non-coaxial optical device an optical device and the first sheet-like optical element; the display panel is used for emitting light based on electronic image content; the non-coaxial optical device includes a light incident surface and a light exit surface, the light incident of the non-coaxial optical device facing the display panel, so that the light emitted by the display panel can be transmitted through the light incident surface and transmitted from the light exit surface; the first sheet-shaped optical element faces the non-coaxial optical device. One side is used to reflect the light transmitted from the light emitting surface to the direction of the human eye, and is used to form a virtual image corresponding to the content of the electronic image, and the first sheet-shaped optical element is also used to provide a deflection of the light when reflecting the light. The optical power of a non-coaxial optical system. In the embodiment of the present application, the first sheet-like optical element can provide a refractive power that is biased toward the non-coaxial optical system, so as to reflect the light to the direction of the human eye, so that the display device module can only include a single sheet-like optical element, Reduced thickness of display device mods.

Embodiments of the present application further provide a head-mounted display device, the head-mounted display device may be an AR/MR device, and the head-mounted display device may include the display device modules shown in FIG. 3a to FIG. 3f above, as shown in FIG. As shown in 3h, the head-mounted display device may include a middle shell (not shown in FIG. 3h), temples 4007 and a front shell 400, and the head-mounted display device may also include a rear shell 500, as shown in the above-mentioned Figures 3a to 3f The display device module can be set in the head-mounted display device shown in FIG. 3h , for details, please refer to the description about the display device module in the above-mentioned embodiment, which will not be repeated here.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or other network device, etc.) to execute all or part of the steps of the method described in the embodiment of FIG. 2 of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions described in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

A display device module, characterized by comprising a display panel, a non-coaxial optical device, a first sheet-shaped optical element and a fixing system; the fixing system is used to fix the display panel, the non-coaxial optical device and the first sheet optical element;

the display panel is configured to emit light based on electronic image content;

The non-coaxial optical device includes a light incident surface and a light exit surface, and the light incident surface of the non-coaxial optical device faces the display panel, so that the light emitted by the display panel can be transmitted through the light incident surface, and the transmitted from the light-emitting surface;

The side of the first sheet-like optical element facing the non-coaxial optical device is used to reflect the light transmitted from the light-emitting surface to the direction of the human eye, and is used to form a virtual image corresponding to the electronic image content. The first sheet-like optical element is also used to provide optical power that is deflected to the non-coaxial optical system when light is reflected.
The display device module according to claim 1, wherein a surface of the first sheet-shaped optical element facing the non-coaxial optical device is provided with a reflective diffraction grating, and the reflective diffraction grating is used for reflecting The light transmitted from the light emitting surface is directed toward the human eye, and provides optical power that is deflected to the non-coaxial optical system when the light is reflected.
The display device module according to claim 1, wherein the first sheet-shaped optical element is further provided with a Fresnel lens, and the Fresnel lens faces the surface of the non-coaxial optical device. It reflects the light transmitted from the light emitting surface to the direction of the human eye, and provides optical power that is deflected to the non-coaxial optical system when the light is reflected.
The display device module according to any one of claims 1 to 3, wherein an angle between the first sheet-like optical element and the direction of the human eye is greater than 45 degrees and less than 90 degrees.
The display device module according to any one of claims 1 to 4, wherein the difference in thickness of each part of the first sheet-like optical element is within a preset range; The thickness is in the range of 0.3 mm to 3 mm.
The display device module according to any one of claims 1 to 5, wherein the first sheet-shaped optical element is a light-transmitting material for transmitting ambient light.
The display device module according to any one of claims 2, 4 to 6, wherein a side of the reflective diffraction grating facing the non-coaxial optical device includes a protrusion, and the protrusion is biased toward the non-coaxial optical device. Non-coaxial optics.
The display device module according to any one of claims 2, 4 to 7, wherein an enhanced reflection film is provided on the surface of the reflective diffraction grating.
The display device module according to any one of claims 2, 4 to 8, wherein the reflective diffraction grating comprises one of an embossed grating, a straight diffraction grating, a blazed grating and a volume holographic grating.
The display device module according to any one of claims 3 to 6, wherein a surface of the Fresnel lens is provided with a transflective film.
The display device module according to claim 10, wherein a transparent adhesive layer is provided on the surface of the partially reflective film, and the difference between the refractive indices of the transparent adhesive layer and the Fresnel lens is predetermined within the range.
The display device module according to any one of claims 1 to 11, wherein the non-coaxial optical device further comprises: at least one reflective surface;

The at least one reflective surface is disposed between the light incident surface and the light emitting surface, so that the light transmitted by the light incident surface can be reflected by the at least one reflective surface and transmitted from the light emitting surface.
A head-mounted display device, wherein the head-mounted display device is an augmented reality AR device or a mixed reality MR device, characterized in that it comprises: a left eye display module, a right eye display module, a middle shell and a temple;

The middle shell is used for fixing the left-eye display module, the right-eye display module and the temple, and the left-eye display module or the right-eye display module includes the display modules according to claims 1 to 12 Any of the display device modules described above.
The head-mounted display device of claim 13, further comprising: a front case;

The front case is connected to the middle case, and the front case is located on the outer surface of the head-mounted display device and is used for protecting the left-eye display module and the right-eye display module.
The head-mounted display device according to claim 13 or 14, wherein the front case comprises a first surface, and the first surface faces away from the left-eye display module and the right-eye display module , the light transmitted from the light-emitting surface of the non-coaxial optical device faces the first surface.
The head-mounted display device according to claim 15, wherein the included angle between the first sheet-like optical element and the first surface is less than 45 degrees.
The head-mounted display device according to claim 15 or 16, wherein the first sheet-like optical element comprises a first end and a second end, and the first end is the first sheet-like optical element the end close to the non-coaxial optical device, the second end is the end of the first sheet optical element away from the non-coaxial optical device, the first end and the first surface The distance is less than the distance of the second end from the first surface.