Display device and wearable equipment

Abstract

The embodiment of the utility model provides a display device which comprises an image generating device, an optical waveguide piece and a decoupling piece, the image generating device is used for emitting image light, and the image light comprises first polarized image light and second polarized image light which are different in polarization state. Image light can be coupled into the coupling-in area of the optical waveguide, and the image light is totally reflected to the coupling-out area in the optical waveguide and then is coupled out through the coupling-out area. The decoupling part can be arranged in the coupling-in area or the coupling-out area and is used for decoupling the image light into first polarized image light emitted in the first direction and second polarized image light emitted in the second direction, and the first polarized image light and the second polarized image light form different view fields after being emitted. Meanwhile, the problem that the angle of the view field is limited is solved, the using effect of the display device is optimized, and the display device is more flexible and wide in application. The embodiment of the utility model further provides a wearable device.

Description

Technical Field

[0001] The present application relates to the technical field of wearable devices, and in particular to a display device and a wearable device. Background Art

[0002] With the development of Virtual Reality (VR) and Augmented Reality (AR) technologies, users are increasingly pursuing visual experience and actual wearing experience. Head-mounted devices can free users' hands, reduce their dependence on screens, and create better visual effects.

[0003] In the prior art, in order to ensure energy utilization, the display device of the head-mounted device uses a polarization beam splitter (PBS) as a coupling element for illumination and imaging. The polarization beam splitter will limit the field of view of the subsequent outgoing light of the display device. The field of view is limited, and the display content of the display device is not convenient for users to observe. Utility Model Content

[0004] The embodiments of the present application provide a display device and a wearable device to at least partially improve the above-mentioned technical problems.

[0005] The embodiments of the present application are implemented through the following technical solutions.

[0006] On the one hand, an embodiment of the present application provides a display device, including an image generating device, an optical waveguide and a decoupling device, the image generating device is used to emit image light, the image light includes a first polarized image light and a second polarized image light, the polarization states of the first polarized image light and the second polarized image light are different, the optical waveguide includes a coupling-in region and a coupling-out region, the coupling-in region is used to receive the image light and couple the image light into the optical waveguide, the coupling-out region is used to couple out the image light, the decoupling device is arranged in the coupling-in region or the coupling-out region, the decoupling device is used to decouple the image light so that the first polarized image light is emitted along a first direction and the second polarized image light is emitted along a second direction, the first polarized image light and the second polarized image light form different fields of view, and the first direction and the second direction are different directions.

[0007] In one embodiment, the decoupling element includes a polarization beam splitter prism and a reflective element. The polarization beam splitter prism is arranged in the coupling-in area or the coupling-out area. The polarization beam splitter prism is used to decouple the image light so that the first polarized image light is emitted along the first direction and the second polarized image light is separated from the first polarized image light. The reflective element is located in the optical path of the second polarized image light and is used to reflect the second polarized image light toward the second direction.

[0008] In one embodiment, a polarization beam splitter prism has a first light emitting surface and a second light emitting surface, and a reflective element is attached to the second light emitting surface. The polarization beam splitter prism is used to decouple image light so that the first polarized image light is emitted along a first direction through the first light emitting surface, and the second polarized image light is incident on the reflective element through the second light emitting surface. The first light emitting surface is tilted relative to the optical waveguide element.

[0009] In one embodiment, the polarization splitting prism has a polarization splitting surface, which is used to transmit the first polarized image light and reflect the second polarized image light to separate the second polarized image light from the first polarized image light. The reflective element has a reflecting surface, which is used to receive and reflect the second polarized image light, and there is an angle between the reflecting surface and the polarization splitting surface.

[0010] In one embodiment, the decoupling element includes a geometric phase grating, which is used to decouple the image light and modulate the first polarized image light and the second polarized image light so that the first polarized image light and the second polarized image light form different fields of view.

[0011] In one embodiment, the decoupling element is attached to the decoupling region or the coupling region.

[0012] In one embodiment, the first direction and the second direction are symmetrical with respect to a normal direction of the optical waveguide.

[0013] In one embodiment, the decoupling element is spaced apart from the decoupling region or the coupling region.

[0014] In one embodiment, the image generating device also includes a light source, a polarization splitter, a first light modulator and a second light modulator, the light source is used to emit illumination light, the polarization splitter is used to split the illumination light into a first polarization state light and a second polarization state light, the first light modulator is used to receive the first polarization state light and modulate it into a second polarization image light, the second light modulator is used to receive the second polarization state light and modulate it into the first polarization image light, and the polarization splitter is also used to combine the first polarization image light and the second polarization image light to form image light.

[0015] On the other hand, an embodiment of the present application provides a wearable device, comprising the above-mentioned display device.

[0016] The embodiments of the present application provide a display device and a wearable device, wherein an image generating device is used to emit image light, and the image light includes a first polarized image light and a second polarized image light with different polarization states. The coupling-in region of the optical waveguide can couple the image light, and the image light is totally reflected in the optical waveguide to the coupling-out region, and then coupled out by the coupling-out region. The decoupling component can be arranged in the coupling-in region or the coupling-out region, and is used to decouple the image light into a first polarized image light emitted along a first direction and a second polarized image light emitted along a second direction. The first polarized image light and the second polarized image light form different fields of view after being emitted. This arrangement can not only improve the field of view range, but also facilitate the control of the display content of different fields of view, and at the same time solve the problem of limited field of view angle, optimize the use effect of the wearable device, and make the application of the wearable device more flexible and extensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of a wearable device proposed in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of a display device proposed in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of an image generating device proposed in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of an optical waveguide component and a decoupling component proposed in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of another optical waveguide component and a decoupling component proposed in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the structure of another optical waveguide component and a decoupling component proposed in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the structure of yet another optical waveguide component and a decoupling component proposed in an embodiment of the present application;

[0025] Figure 8 This is a schematic structural diagram of yet another optical waveguide component and a decoupling component proposed in an embodiment of the present application.

[0026] Figure numerals: wearable device 1, display device 100, image generating device 110, light source 111, polarization splitter 112, first light modulator 113, second light modulator 114, optical waveguide 120, coupling-in region 121, coupling-out region 122, decoupling element 130, polarization splitter prism 131, polarization splitter surface 1311, first light emitting surface 1312, second light emitting surface 1313, reflecting element 132, reflecting surface 1321, geometric phase grating 133. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the utility model, not all the implementation modes. Based on the implementation mode in the utility model, all other implementation modes obtained by those skilled in the art without making creative work are within the scope of protection of the utility model.

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application.

[0029] This embodiment provides a wearable device 1, see Figure 1 The wearable device 1 can adopt augmented reality technology, virtual reality technology, mixed reality technology (Mixed Reality, MR) and extended reality (Extended-range, XR), etc., so as to bring users a more realistic experience and strong sensory stimulation, or provide convenience for users in various aspects such as intelligent manufacturing, education and training, and process design.

[0030] The wearable device 1 can be worn by the user, and includes but is not limited to AR glasses, AR helmets, VR helmets, VR glasses, etc. The wearable device 1 can sense, transmit and process information, and integrates the most cutting-edge technologies such as multimedia, wireless communication, micro-sensing, flexible screens, satellite positioning systems, biometrics, artificial intelligence, etc. In addition, the wearable device 1 can also be a bracelet, a smart watch, etc., which will not be described in detail in this embodiment.

[0031] In this example, please continue to refer to Figure 1The wearable device 1 may include a display device 100. After the wearable device 1 is worn by a user, the display device 100 can be obtained by the user's naked eyes. The display device 100 receives sensor signals, external communication signals, multimedia content, etc., and displays them in the user's field of vision for the user to obtain or use. In addition, the user can operate the display device 100 through other device interactions, gesture interactions, eye recognition and other technologies to make the display device 100 display target information.

[0032] In another embodiment, the display device 100 may also be combined with one or more imaging sensors for capturing images or videos of the physical environment and / or one or more microphones and speakers for capturing audio of the physical environment to provide a rich display effect for the user.

[0033] In this example, see Figure 2 The display device 100 may include an image generating device 110 , an optical waveguide 120 , and a decoupling member 130 , wherein the optical waveguide 120 or the decoupling member 130 is located in an outgoing light path of the image generating device 110 .

[0034] See also Figure 3 The image generating device 110 is used to emit image light, which is a light beam having image information and propagating in the form of light. The image light can be formed by modulating the illumination light. Exemplarily, the image generating device 110 may include a light source 111, a polarization beam splitter 112, a first light modulator 113, and a second light modulator 114. The light source 111 is used to emit illumination light. The polarization beam splitter 112 is disposed in the light path of the illumination light emitted by the light source 111. The first light modulator 113 and the second light modulator 114 are disposed in the light path of the emission of the polarization beam splitter 112.

[0035] For more details, please refer to Figure 3 , the light source 111 can be a laser light source, i.e. a laser diode (LD), which is used to emit laser light, and laser light has the advantages of good coherence, high brightness, and good directionality. Alternatively, the light source 111 can be a fluorescent light source, i.e. a light-emitting diode (LED), which is used to emit fluorescent light, and the cost of fluorescent lighting is lower. This embodiment does not limit the type of light source 111 and the type of emitted light, and can be selected and designed according to the specific implementation scenario and requirements.

[0036] The polarization beam splitter 112 may be a polarization beam splitter (PBS), which may be used to decouple the illumination light to form a plurality of light beams of different polarization states. Furthermore, the polarization beam splitter 112 is located in the optical path of the illumination light, and the polarization beam splitter 112 may be used to decouple the illumination light and emit a first polarization state light and a second polarization state light, wherein the polarization states of the first polarization state light and the second polarization state light are different. Among them, the first polarization state light may be polarized light of a P polarization state, i.e., parallel polarized light. The second polarization state light may be polarized light of an S polarization state, i.e., vertically polarized light. The polarization directions of the P polarization light and the S polarization light are orthogonal to each other. In another embodiment, the first polarization state light may be polarized light of an S polarization state. The second polarization state light may be polarized light of a P polarization state, which is not described in detail in this embodiment.

[0037] In a more specific embodiment, the polarization splitter device 112 has a polarization splitter medium film (not shown in the figure), which can transmit the first polarization state light in the illumination light and reflect the second polarization state light in the illumination light, so that the first polarization state light and the second polarization state light are emitted in different directions, thereby achieving a separation effect. In addition, by adjusting the incident angle of the illumination light on the polarization splitter medium film, the first polarization state light and the second polarization state light can be adjusted to be emitted in mutually perpendicular directions, so as to facilitate subsequent modulation of both the first polarization state light and the second polarization state light.

[0038] The first optical modulator 113 and the second optical modulator 114 are both Liquid Crystal on Silicon (LCOS) panels. When current passes through the circuit on the silicon substrate in the LCOS panel, it can change the state of the corresponding pixel points in the liquid crystal layer, thereby controlling these pixel points to transmit or block light. Then, by utilizing the high reflectivity characteristics of the silicon substrate, the light is reflected after passing through the liquid crystal layer, forming a clear image light.

[0039] In one embodiment, the first optical modulator 113 is used to receive the first polarization state light and modulate it into the second polarization image light. More specifically, the first polarization state light is transmitted through the polarization beam splitter 112, and the first optical modulator 113 is disposed in the optical path of the first polarization state light emitted by the polarization beam splitter 112. The first optical modulator 113 is used to receive the first polarization state light and modulate it into the second polarization image light emitted to the polarization beam splitter 112, and the second polarization image light is then reflected by the polarization beam splitter 112.

[0040] The second light modulator 114 is used to receive the second polarization state light and modulate it into the first polarization image light. The polarization states of the first polarization image light and the second polarization image light are different. For example, one of the first polarization image light and the second polarization image light can be P polarization light, and the other can be S polarization light.

[0041] For more details, please refer to Figure 3 , the second polarized light is reflected to the second light modulator 114 via the polarization beam splitter 112, the second light modulator 114 is arranged in the light path of the second polarized light emitted from the polarization beam splitter 112, the second light modulator 114 is used to receive the second polarized light and modulate it into the first polarized image light emitted to the polarization beam splitter 112, and the first polarized image light is transmitted through the polarization beam splitter 112. The independently arranged first light modulator 113 and the second light modulator 114 can independently modulate to form the second polarized image light and the first polarized image light, so that the first polarized image light and the second polarized image light can display different contents, avoid mutual influence between the two, and improve the display effect of the first polarized image light and the second polarized image light.

[0042] Please continue reading Figure 3 The polarization beam splitter 112 is also used to combine the first polarized image light and the second polarized image light to form image light. The second polarized image light emitted by the first light modulator 113 and the first polarized image light emitted by the second light modulator 114 are combined by the polarization beam splitter 112 to form image light, so that the image light is composed of the first polarized image light and the second polarized image light in two different polarization states, and the image light is emitted to the optical waveguide or the decoupling element.

[0043] In this example, see Figure 3 as well as Figure 4 The optical waveguide 120 may be a diffraction optical waveguide, which utilizes the transmission effect of the optical waveguide and the diffraction characteristics of light to guide light into a specific path.

[0044] More specifically, the optical waveguide 120 may include an incoupling region 121 and an outcoupling region 122, wherein the incoupling region 121 is used to receive the image light and couple the image light into the optical waveguide 120, and the outcoupling region 122 is used to couple the image light out of the optical waveguide 120. Exemplarily, the image light is coupled into the optical waveguide 120 through the incoupling region 121, and is totally reflected in the optical waveguide 120 to the outcoupling region 122, and the image light is coupled out of the optical waveguide 120 through the outcoupling region 122, thereby realizing the transmission of the optical signal in a specific path.

[0045] In one embodiment, the coupling-in region 121 and the coupling-out region 122 may be disposed on the same surface of the optical waveguide 120, or the coupling-in region 121 and the coupling-out region 122 may be disposed on two opposite surfaces of the optical waveguide 120. After the image light is transmitted through the optical waveguide 120, it may be emitted in a direction opposite to or the same as the initial direction. This configuration may adjust the subsequent emission direction of the image light, so that the optical path setting of the image light is more flexible, and it is convenient for subsequent optical devices to obtain the image light.

[0046] To facilitate observation of the difference between the incident angle and the output angle of the image light, the following description is made by taking the case where the coupling-in region 121 and the coupling-out region 122 are disposed on two opposite surfaces of the optical waveguide 120 as an example.

[0047] In another embodiment, the optical waveguide 120 may also be an optical fiber waveguide, etc., which will not be described in detail.

[0048] It can be understood that the image light is not significantly deflected or scattered inside the optical waveguide 120, and the geometric shape and refractive index distribution of the optical waveguide 120 enable the image light to maintain its directionality when incident. Furthermore, in some embodiments, the incident angle and the exit angle of the image light in the optical waveguide 120 may be the same.

[0049] In this example, see Figure 4 , the decoupling element 130 is used to decouple the image light so that the first polarized image light is emitted along the first direction and the second polarized image light is emitted along the second direction. The first direction and the second direction are different directions. Exemplarily, there may be an angle between the first direction and the second direction. After being decoupled by the decoupling element 130, the first polarized image light and the second polarized image light are emitted in different directions. And in the subsequent optical path, the first polarized image light and the second polarized image light can form relatively independent imaging areas at different positions, so that the first polarized image light and the second polarized image light form different fields of view. The field of view refers to the range of the object space in which the first polarized image light and / or the second polarized image light can be imaged.

[0050] In addition, on the basis of the decoupling element 130 forming different fields of view, the display device 100 controls the modulation of the first light modulator 113 and the second light modulator 114, so that the first polarized image light and the second polarized image light can be independently imaged, so as to more actively and flexibly control the display content of different fields of view, thereby solving the problem of limited field of view angle of the display device 100 and enriching the display effect and usage operation of the wearable device 1.

[0051] It can be understood that the first polarized image light and the second polarized image light can maintain their directionality when incident due to the geometric shape and refractive index distribution of the light waveguide 120. The incident angle and the exit angle of the first polarized image light and the second polarized image light in the light waveguide 120 can be the same, and thus the light waveguide 120 does not affect the first polarized image light and the second polarized image light from propagating in different directions, nor does it affect the display device 100 from forming different fields of view. Therefore, Figure 4 as well as Figure 5 As shown, the decoupling element 130 can be arranged in the coupling-in region 121 or the coupling-out region 122 of the optical waveguide element 120. Figure 4 A schematic diagram showing that the decoupling element 130 is disposed in the coupling-in region 121 of the optical waveguide element 120, Figure 5 The schematic diagram shows that the decoupling element 130 is disposed in the outcoupling region 122 of the optical waveguide element 120. It can be seen that, on the basis of completing the image light decoupling, the decoupling element 130 can be relatively flexibly disposed in the display device 100, which can reduce the difficulty of installing and calibrating the decoupling element 130 and improve the assembly efficiency of the display device 100.

[0052] For the convenience of subsequent writing, the following content is described by taking the decoupling member 130 being disposed in the coupling-in area 121 as an example.

[0053] In this embodiment, if Figure 4 As shown, the first direction and the second direction may be symmetrical with respect to the normal direction of the optical waveguide 120. Furthermore, the first polarized image light and the second polarized image light are incident on the optical waveguide 120 symmetrically with respect to the normal direction of the optical waveguide 120. After being totally reflected and transmitted through the optical waveguide 120, the first polarized image light and the second polarized image light are emitted symmetrically with respect to the normal direction of the optical waveguide 120 in the outcoupling region 122, so as to form two more uniform fields of view, thereby avoiding the imaging effect of the display device 100 being affected by the difference in the fields of view.

[0054] In a more specific implementation, please refer to Figure 4 The decoupling element 130 may include a polarization beam splitter prism 131 and a reflector 132 . The polarization beam splitter prism 131 is disposed in the coupling-in region 121 or the coupling-out region 122 of the optical waveguide element 120 , and the reflector 132 is located in the outgoing light path of the polarization beam splitter prism 131 .

[0055] The polarization beam splitter prism 131 is used to decouple the image light, so that the first polarized image light is emitted in the first direction, and the second polarized image light is separated from the first polarized image light. Specifically, the image light can be incident on the polarization beam splitter prism 131 in the first direction, and the polarization beam splitter prism 131 can transmit the first polarized image light in the image light, and the first polarized image light that passes through the polarization beam splitter prism 131 continues to be emitted in the first direction. The polarization beam splitter prism 131 reflects the second polarized image light in the image light, and the second polarized image light is emitted in a direction different from the first direction, so that the first polarized image light and the second polarized image light are emitted in different directions, thereby achieving the function of decoupling the image light.

[0056] Meanwhile, the reflector 132 is located in the optical path of the second polarized image light and can be used to reflect the second polarized image light toward the second direction. The second polarized image light can propagate along the second direction, thereby causing the first polarized image light and the second polarized image light to be emitted in different directions.

[0057] For more details, please refer to Figure 4 The polarization splitting prism 131 has a polarization splitting surface 1311, wherein the polarization splitting surface 1311 can be formed by a polarization splitting medium film of the polarization splitting prism 131. The polarization splitting surface 1311 is used to transmit the first polarized image light so that the first polarized image light is emitted along the first direction, and the polarization splitting surface 1311 reflects the second polarized image light, and makes the second polarized image light incident on the reflective element 132, so that the second polarized image light is separated from the first polarized image light. The reflective element 132 has a reflecting surface 1321, and the reflecting surface 1321 is used to receive the second polarized image light and reflect the second polarized image light toward the second direction. At the same time, there is an angle between the reflecting surface 1321 and the polarization splitting surface 1311, so that the reflecting surface 1321 and the polarization splitting surface 1311 are not arranged in parallel. The non-parallel arrangement of the reflective surface 1321 and the polarization splitting surface 1311 can prevent the propagation direction of the second polarized image light after two reflections from being parallel to or overlapping with the propagation direction of the first polarized image light, thereby ensuring the decoupling effect and reliability of the polarization splitting prism 131 and the reflector 132 .

[0058] Since the first polarized image light is transmitted through the polarization beam splitter prism 131, and the direction of the first polarized image light does not change. Furthermore, in this embodiment, the emission direction of the second polarized image light can be changed by adjusting the relative position of the reflector 132, etc., so as to adjust the angle between the second polarized image light and the first polarized image light, thereby ensuring smooth decoupling of the first polarized image light and the second polarized image light. Exemplarily, the first polarized image light is vertically incident on the optical waveguide 120, and the angle between the reflector 132 and the optical waveguide 120 is increased to increase the angle between the second polarized image light and the first polarized image light, thereby causing the fields of view formed by the first polarized image light and the second polarized image light to be farther apart, thereby reducing the possibility of mutual influence between the two.

[0059] Preferably, when adjusting the angle between the reflecting surface 1321 and the polarization splitting surface 1311, the relative positions of the reflecting surface 1321 and the polarization splitting surface 1311, the field of view between the second polarized image light and the first polarized image light, etc. can be comprehensively considered to avoid the reflector 132 re-reflecting at least part of the second polarized image light to the polarization splitting surface 1311 or causing other erroneous operations, thereby reducing energy loss.

[0060] In this example, please continue to refer to Figure 4 The polarization beam splitter prism 131 has a first light exit surface 1312 and a second light exit surface 1313. The first light exit surface 1312 and the second light exit surface 1313 can be arranged adjacent to each other. The reflector 132 is attached to the second light exit surface 1313. The polarization beam splitter prism 131 is used to decouple the image light, so that the first polarized image light is emitted along the first direction through the first light exit surface 1312, and the second polarized image light is incident on the reflector 132 through the second light exit surface 1313. The first light exit surface 1312 is arranged obliquely relative to the optical waveguide 120. The polarization beam splitter prism 131 is arranged obliquely with respect to the optical waveguide 120, so that the angles of the first polarized image light and the second polarized image light incident on the optical waveguide 120 can be adjusted, so that the fields of view formed by the first polarized image light and the second polarized image light are farther apart, and thus the fields of view of the two can also be configured to be larger, thereby improving the display effect of the display device 100.

[0061] Understandable, such as Figure 4 As shown, after the decoupling element 130 composed of the polarization beam splitter prism 131 and the reflector 132 decouples, the first polarized image light and the second polarized image light converge with each other until they are emitted into the coupling-in region 121. This configuration can reduce the area requirement of the coupling-in region 121 while completing the decoupling of the first polarized image light and the second polarized image light, thereby reducing the volume of the optical waveguide 120.

[0062] In another embodiment, see Figure 6The decoupling element 130 may include a geometric phase grating 133 (GP) prism 133. The geometric phase grating 133 prism 133 is based on the interference and diffraction effects of light. It introduces a phase difference in the light wave through a specific structure to achieve phase modulation of the image light and screening of different polarization states. The geometric phase grating 133 prism 133 is small in size, which is conducive to reducing the total volume of the display device 100 and improving the application scenarios of the display device 100. The smaller display device 100 can optimize the wearing effect of the wearable device 1 and avoid causing discomfort to the user.

[0063] The geometric phase grating 133 is used to decouple the image light, and to filter out the first polarized image light and the second polarized image light in the image light, respectively, and to make the first polarized image light and the second polarized image light emerge in different directions. For example, the first polarized image light emerges in a first direction, and the second polarized image light emerges in a second direction, so that the first polarized image light and the second polarized image light form different fields of view. More specifically, after the first polarized image light and the second polarized image light are decoupled, they emerge in directions away from each other, and the geometric phase grating 133 can.

[0064] In addition, the geometric phase grating 133 can also be used to modulate the polarization states of the first polarized image light and the second polarized image light. Exemplarily, under the action of the geometric phase grating 133, the first polarized image light is modulated into the second polarized image light, and the second polarized image light is modulated into the first polarized image light. Furthermore, the geometric phase grating 133 can play a certain modulation role, which is not described in detail in this embodiment.

[0065] In this example, please refer to Figure 4 , the decoupling member 130 may be spaced apart from the optical waveguide member 120. Exemplarily, the decoupling member 130 may be spaced apart from the coupling-in region 121, or the decoupling member 130 may be spaced apart from the coupling-out region 122. This configuration may form a gap between the decoupling member 130 and the optical waveguide member 120, and the gap may hinder heat conduction between the decoupling member 130 and the optical waveguide member 120, thereby preventing the heat from affecting each other.

[0066] In another embodiment, see Figure 7 , the decoupling member 130 may be attached to the optical waveguide member 120. Exemplarily, the decoupling member 130 may also be attached to the coupling-in region 121, or the decoupling member 130 may be attached to the coupling-out region 122. This configuration may shorten the distance between the decoupling member 130 and the optical waveguide member 120 to reduce the propagation loss of the image light between the decoupling member 130 and the optical waveguide member 120. In addition, this configuration may further reduce the volume of the display device 100 and avoid heat conduction between the decoupling member 130 and the optical waveguide member 120.

[0067] Preferably, the display device 100 may also be provided with a heat dissipation fan (not shown in the figure), and the heat dissipation fan faces the gap between the decoupling member 130 and the optical waveguide member 120. The airflow driven by the heat dissipation fan passes through the gap, takes away the surface heat of the decoupling member 130 and the optical waveguide member 120, reduces the operating temperature of the display device 100, and improves its use stability.

[0068] In addition, Figure 6 As shown, the decoupling element composed of the geometric phase grating 133 can also be spaced apart from the optical waveguide element 120, which can hinder the heat conduction between the decoupling element 130 and the optical waveguide element 120. Figure 8 As shown, the decoupling element composed of the geometric phase grating 133 can also be attached to the optical waveguide element 120, which can further reduce the volume of the display device 100, which is not described in detail in this embodiment.

[0069] The embodiment of the present application provides a display device 100 and a wearable device 1, wherein an image generating device 110 is used to emit image light, and the image light includes a first polarized image light and a second polarized image light of different polarization states. The coupling-in region 121 of the optical waveguide 120 can couple the image light, and the image light is totally reflected in the optical waveguide 120 to the coupling-out region 122, and then coupled out by the coupling-out region 122. The decoupling member 130 can be arranged in the coupling-in region 121 or the coupling-out region 122, and is used to decouple the image light into a first polarized image light emitted in a first direction and a second polarized image light emitted in a second direction. The first polarized image light and the second polarized image light form different fields of view after being emitted. This arrangement can not only improve the field of view range, but also facilitate the control of the display content of different fields of view, and at the same time solve the problem of limited field of view angle, optimize the use effect of the wearable device 1, and make the application of the wearable device 1 more flexible and extensive.

[0070] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as specific or special structures. The description of the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present utility model, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present utility model and the features of different embodiments or examples without contradiction.

[0071] The above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A display device, characterized in that: include: An image generating device, the image generating device is used to emit image light, the image light includes a first polarized image light and a second polarized image light, the first polarized image light and the second polarized image light have different polarization states; An optical waveguide, the optical waveguide comprising an incoupling region and an outcoupling region, the incoupling region being used to receive the image light and couple the image light into the optical waveguide, and the outcoupling region being used to couple out the image light; as well as A decoupling member, wherein the decoupling member is disposed in the coupling-in region or the coupling-out region, and is used to decouple the image light so that the first polarized image light is emitted along a first direction, and the second polarized image light is emitted along a second direction, the first polarized image light and the second polarized image light form different fields of view, and the first direction and the second direction are different directions.

2. The display device according to claim 1, characterized in that The decoupling component includes a polarization beam splitter prism and a reflective component. The polarization beam splitter prism is arranged in the coupling-in area or the coupling-out area. The polarization beam splitter prism is used to decouple the image light so that the first polarized image light is emitted along the first direction and the second polarized image light is separated from the first polarized image light. The reflective component is located in the optical path of the second polarized image light and is used to reflect the second polarized image light toward the second direction.

3. The display device according to claim 2, characterized in that: The polarization beam splitter prism has a first light-emitting surface and a second light-emitting surface, and the reflector is attached to the second light-emitting surface. The polarization beam splitter prism is used to decouple the image light so that the first polarized image light is emitted along the first direction through the first light-emitting surface, and the second polarized image light is incident on the reflector through the second light-emitting surface, and the first light-emitting surface is tilted relative to the optical waveguide.

4. The display device according to claim 2, characterized in that: The polarization splitting prism has a polarization splitting surface, which is used to transmit the first polarized image light and reflect the second polarized image light to separate the second polarized image light from the first polarized image light. The reflective element has a reflecting surface, which is used to receive and reflect the second polarized image light, and there is an angle between the reflecting surface and the polarization splitting surface.

5. The display device according to claim 1, characterized in that The decoupling element includes a geometric phase grating, which is used to decouple the image light and modulate the first polarized image light and the second polarized image light so that the first polarized image light and the second polarized image light form different fields of view.

6. The display device according to claim 2 or 5, characterized in that: The decoupling component is attached to the out-coupling region or the in-coupling region.

7. The display device according to any one of claims 1 to 5, characterized in that: The first direction and the second direction are symmetrical with respect to a normal direction of the optical waveguide.

8. The display device according to any one of claims 1 to 5, characterized in that: The decoupling element is spaced apart from the decoupling region or the coupling region.

9. The display device according to claim 1, characterized in that: The image generating device includes a light source, a polarization beam splitter, a first light modulator and a second light modulator. The light source is used to emit illumination light. The polarization beam splitter is used to split the illumination light into a first polarization state light and a second polarization state light. The first light modulator is used to receive the first polarization state light and modulate it into the second polarization image light. The second light modulator is used to receive the second polarization state light and modulate it into the first polarization image light. The polarization beam splitter is also used to combine the first polarization image light and the second polarization image light to form the image light.

10. A wearable device, characterized in that: include: A display device as claimed in any one of claims 1 to 9.

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