CN221303715U - Light source device and wearable equipment - Google Patents

Abstract

The embodiment of the application provides a light source device, which comprises a light source assembly, a lens module and an optical waveguide sheet, wherein the light source assembly comprises a light source, the light source emits a plurality of monochromatic light rays along a first direction, the lens module comprises a plurality of first lenses, the plurality of first lenses are correspondingly positioned on the light paths of the plurality of monochromatic light rays one by one, and the optical waveguide sheet is provided with a coupling-in element. The light source emits a plurality of monochromatic light beams, the first lens can separate the monochromatic light beams so as to enable the monochromatic light beams to be staggered, the crosstalk phenomenon of adjacent monochromatic light beams is avoided, the light quality of the light source device is improved, and the size of the light source device is not obviously increased. The application further provides the wearable device.

Description

Light source device and wearable equipment

Technical Field

The application relates to the field of light emission, in particular to a light source device and wearable equipment.

Background

With the increasing demand of people for immersive experiences, miniature projection technology has been actively developed in recent years, and thus, the pursuit of people for visual experience is gradually satisfied. In the micro projection technology, the light source can emit light beams, and LCOS, DMD or the like can be used as a display chip to complete the modulation of light rays. Since the miniature projection device is more fit for wearing by a human body, the miniature projection technology nowadays is more pursued to be arranged with small volume, convenience and the like. However, at the same time, the light propagation path in the micro projection device is limited by a certain volume, and various different light beams can generate crosstalk in the micro projection device, so that interference between light sources is generated, and further, the emergent image of the micro projection device is problematic.

Disclosure of utility model

The embodiment of the application provides a light source device and wearable equipment, which are used for at least partially improving the technical problems.

In a first aspect, an embodiment of the present application provides a light source device, including a light source assembly, a lens module, and an optical waveguide sheet, where the light source emits a plurality of monochromatic light beams along a first direction, the lens module includes a plurality of first lenses, the plurality of first lenses are located on optical paths of the plurality of monochromatic light beams in a one-to-one correspondence manner, the plurality of first lenses are used for separating the plurality of monochromatic light beams so as to make the plurality of monochromatic light beams mutually staggered, and the optical waveguide sheet is provided with a coupling element and a coupling-out element, where the coupling element is used for receiving the separated monochromatic light beams and is coupled into the optical waveguide sheet.

In one embodiment, the light source includes a first light source, a second light source and a third light source arranged side by side along the second direction, the first light source, the second light source and the third light source emit a first light ray, a second light ray and a third light ray along the first direction respectively, the plurality of first lenses include a first sub-lens, a second sub-lens and a third sub-lens, the first sub-lens is located in a light path of the first light ray and deflects the first light ray towards a direction far away from the second light ray, the second sub-lens is located in a light path of the second light ray, the third sub-lens is located in a light path of the third light ray and deflects the third light ray towards a direction far away from the second light ray.

In an embodiment, the lens module further includes a plurality of second lenses, the plurality of second lenses are located on the light-emitting paths of the plurality of first lenses in a one-to-one correspondence manner, and the plurality of second lenses are configured to collimate the first light, the second light and the third light transmitted through the plurality of first lenses, so that the first light, the second light and the third light are incident to the coupling-in element at a first angle.

In one embodiment, the plurality of second lenses includes a fourth sub-lens, a fifth sub-lens and a sixth sub-lens, the fourth sub-lens is disposed between the first sub-lens and the optical waveguide sheet, and an optical axis of the fourth sub-lens is offset from an optical axis of the first sub-lens, the fifth sub-lens is disposed between the second sub-lens and the optical waveguide sheet, and the fifth sub-lens and the second sub-lens are on the same optical axis, and the sixth sub-lens is disposed between the third sub-lens and the optical waveguide sheet, and an optical axis of the sixth sub-lens is offset from an optical axis of the third sub-lens.

In one embodiment, the optical axis of the fourth sub-lens is located on a side of the optical axis of the first sub-lens away from the second sub-lens, and the optical axis of the fourth sub-lens is parallel to the optical axis of the first sub-lens, the optical axis of the sixth sub-lens is located on a side of the optical axis of the third sub-lens away from the second sub-lens, and the optical axis of the sixth sub-lens is parallel to the optical axis of the third sub-lens.

In one embodiment, the image point of the first light passing through the first sub-lens is located at the focal plane of the fourth sub-lens, the image point of the second light passing through the second sub-lens is located at the focal plane of the fifth sub-lens, and the image point of the third light passing through the third sub-lens is located at the focal plane of the sixth sub-lens.

In one embodiment, the coupling-in element and the light source assembly are positioned on two opposite sides of the optical waveguide sheet, and the first light, the second light and the third light are all light with a first polarization state; and

The light source device further comprises a polarization conversion layer, the polarization conversion layer is arranged on one side, far away from the optical waveguide sheet, of the coupling-in element, monochromatic light transmitted through the first lens enters the polarization conversion layer through the optical waveguide sheet to be converted into light with a second polarization state, and the plurality of second lenses are used for reflecting and collimating the converted light with the second polarization state towards the coupling-in element so that the light is coupled into the coupling-in element in a mode that the light is incident into the optical waveguide sheet at a first angle.

In one embodiment, the coupling-in element includes a first sub-coupling-in element, a second sub-coupling-in element and a third sub-coupling-in element, wherein the first sub-coupling-in element is used for coupling in the first light, the second sub-coupling-in element is used for coupling in the second light, and the third sub-coupling-in element is used for coupling in the third light; the diffraction efficiency of the two ends of the first sub-coupling element, the second sub-coupling element and the third sub-coupling element is different; the size of a light spot formed when the first light is incident to the first sub-coupling-in element is smaller than that of the first sub-coupling-in element, and the light spot formed when the first light is incident to the first coupling-in element is close to one end of the first sub-coupling-in element with high diffraction; the size of a light spot formed when the second light is incident to the second sub-coupling-in element is smaller than that of the second sub-coupling-in element, and the light spot formed when the second light is incident to the second coupling-in element is close to one end of the second sub-coupling-in element with high diffraction; the size of a light spot formed when the third light is incident to the third sub-coupling-in element is smaller than that of the third sub-coupling-in element, and the light spot formed when the third light is incident to the third coupling-in element is close to one end of the third sub-coupling-in element with high diffraction.

In one embodiment, the first angle is 0 °.

In one embodiment, the distance between the light source and the first lens is 1-2 times the focal length of the first lens.

In one embodiment, the light source assembly further includes a diffusion sheet, and the diffusion sheet is used for diffusing the plurality of monochromatic light rays emitted by the light source, and the plurality of first lenses are located on the light paths of the diffused plurality of monochromatic light rays in a one-to-one correspondence manner.

In a second aspect, an embodiment of the present application provides a wearable device, including the light source device of the first aspect and a spatial light modulator, where the spatial light modulator is configured to receive light coupled out from the coupling element, and form image light after modulation.

The application provides a light source device and wearable equipment, wherein a light source emits a plurality of monochromatic light rays along a first direction, a lens module comprises a plurality of first lenses, the plurality of first lenses are positioned on the light path of the plurality of monochromatic light rays in a one-to-one correspondence manner, and an optical waveguide sheet is provided with a coupling element. The light source emits a plurality of monochromatic light beams, the first lens can separate the monochromatic light beams so as to enable the monochromatic light beams to be staggered, the crosstalk phenomenon of adjacent monochromatic light beams is avoided, the light quality of the light source device is improved, the size of the light source device is not obviously increased, and the miniature setting of the wearable equipment is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a wearable device according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of another wearable device according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of still another wearable device according to an embodiment of the present application.

Reference numerals: the wearable device 1, the light source apparatus 10, the light source assembly 11, the light source 111, the diffusion sheet 112, the first light source 113, the second light source 114, the third light source 115, the lens module 12, the first lens 121, the first sub-lens 122, the second sub-lens 123, the third sub-lens 124, the second lens 125, the fourth sub-lens 126, the fifth sub-lens 127, the sixth sub-lens 128, the optical waveguide sheet 13, the coupling-in element 131, the coupling-out element 132, the first sub-coupling-in element 133, the second sub-coupling-in element 134, the third sub-coupling-in element 135, the polarization conversion layer 14, the spatial light modulator 20.

Detailed Description

In order to make the present application better understood by those skilled in the art, the following description of the present application will be made in detail with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the application. All other embodiments, based on the embodiments of the application, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the application.

In the present application, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In the present application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples of the present application and features of various embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Examples

In the embodiment of the application, referring to fig. 1, the wearable device 1 may use an augmented Reality (Augmented Reality, AR), a Virtual Reality (VR), a Mixed Reality (MR), an Extended-range (XR), and the like, so as to bring more real experience and strong sensory stimulation to a user, or provide convenience to the user in various aspects of intelligent manufacturing, educational training, process design, and the like.

Referring to fig. 1 and 2, the wearable device 1 may include a light source device 10 and a spatial light modulator 20, where the light source device 10 emits a light beam, and the spatial light modulator 20 is disposed on an optical path of the emitted light beam. The spatial light modulator 20 emits image light and the wearable device 1 may also have one or more displays. The display may be a transparent, translucent or opaque display. A transparent or translucent display or an opaque display may serve as a medium through which image light may be transmitted to the eyes of a user. The medium may also be an optical waveguide, a holographic medium, an optical combiner, an optical reflector, or any combination thereof. The wearable device 1 may also incorporate one or more imaging sensors for capturing images or video of the physical environment and/or one or more microphones and speakers for capturing audio of the physical environment.

In this embodiment, referring to fig. 2, the light source device 10 may include a light source assembly 11, a lens module 12 and an optical waveguide sheet 13. The light source assembly 11 is disposed at one side of the lens module 12, and the light source assembly 11 can emit light toward the lens module 12. The lens module 12 receives the light to adjust the light. And the light of the lens module 12 is emitted to the coupling-in area of the optical waveguide sheet 13, and the light enters the optical waveguide sheet 13 and is totally reflected in the optical waveguide sheet 13. Light can propagate from the coupling-in region of the optical waveguide sheet 13 to the coupling-out region of the optical waveguide sheet 13. The coupling-out region corresponds to the spatial light modulator 20 so that light can be coupled out of the optical waveguide sheet 13 and propagated to the spatial light modulator 20 for modulation by the spatial light modulator 20.

Preferably, by adjusting the relative positional relationship between the lens module 12 and the light source module 11, light spots formed in the optical waveguide sheet 13 can be configured to be closely connected, that is, the light is emitted to the optical waveguide sheet 13 to form a first light spot, the light is totally reflected in the optical waveguide sheet 13 to form a second light spot, the first light spot and the second light spot are adjacently arranged, and then multiple total reflections form multiple light spots, and the multiple light spots are sequentially adjacently arranged. By way of example, the relative positional relationship between the lens module 12 and the light source module 11 may be adjusted, so that the light after the primary total reflection is disposed adjacent to the light when the light is not reflected, and the light after the secondary total reflection is disposed adjacent to the light when the primary total reflection is disposed, so as to form the tightly connected light. Avoiding the formation of multiple independent spots and ensuring proper use of the subsequent spatial light modulator 20.

The light source assembly 11 may include a light source 111, where the light source 111 emits multiple monochromatic light beams along a first direction, and the multiple monochromatic light beams may be of the same color or different colors. The light source 111 may include a plurality of individual monochromatic light sources, and illustratively, the light source 111 may include a plurality of red light sources that emit red light in a first direction, indicated as L1, for use by subsequent optical elements. In another embodiment, the light source 111 may further include a red light source, a blue light source, and a green light source, where the red light emitted by the red light source, the blue light emitted by the blue light source, and the green light emitted by the green light source together form a plurality of monochromatic lights. The light source 111 may be a laser light source, and the light source 111 may emit laser light, which has the characteristics of high brightness, good monochromaticity, and the like, so as to effectively improve the use effect of the wearable device 1. However, since the divergence angle of the laser light is very small, the etendue of the laser light is small, and the optical devices in the subsequent optical paths need a larger etendue, so that the subsequent use is difficult to meet.

Further, the light source assembly 11 may further include a diffusion sheet 12. The diffusion sheet 112 is used for diffusing the monochromatic light emitted by the light source 111, and the light can be diffused by the diffusion sheet 112, so that the monochromatic light emitted by the light source 111 has a sufficient illumination area for the subsequent optical devices. In addition, when the light source 111 is a laser light source, the diffusion sheet 112 can also eliminate speckle on the monochromatic light beam, which is beneficial to improving the light quality of the light source device 10.

In one embodiment, referring to FIG. 2, diffuser 112 is configured to be movable along a plane perpendicular to the monochromatic light rays. The diffusion sheet 112 which is movably arranged can increase the random distribution of the divergence degree and the divergence angle of the laser beam, so that the random space phase of the laser beam is increased with smaller volume, and the optical expansion of the laser beam is further improved. And the movement of the diffusion sheet 112 includes rotation about a rotation axis parallel or collinear with the monochromatic light, reciprocation perpendicular to the monochromatic light, etc., which is not limited in this embodiment.

In other embodiments, the light source device 10 may further include a driving device including, but not limited to, a motor, an electric push rod, and the like. The driving device is connected with the diffusion sheet 112, and the driving device is used for driving the diffusion sheet 112 to move. For example, the driving device may be a motor, an output shaft of the motor is connected to the diffusion sheet 112, the motor may drive the diffusion sheet 112 to rotate, the rotation axis of the motor may be parallel or collinear with the monochromatic light, and the movement direction of the diffusion sheet 112 may be parallel or collinear with the optical axis direction of the monochromatic light. Or the driving device may be an electric push rod, the electric push rod is connected with the diffusion sheet 112, the electric push rod can drive the diffusion sheet 112 to reciprocate, and the movement direction of the diffusion sheet 112 can be perpendicular to the monochromatic light. The driving device can provide stable and continuous driving force, so that the diffusion sheet 112 can accurately move according to the expected movement, and the optical expansion of the laser beam can be accurately improved.

It is understood that the driving device may be other driving devices such as a magnetic driving device, and the movement direction of the diffusion sheet may be multiple different directions, which is not limited in this embodiment. For example, the driving device is a magnetic driving device, the diffusion sheet is influenced by magnetic force to turn over at a certain angle, and the driving device can also provide stable and continuous driving force, so that the optical expansion of the laser beam is improved accurately.

The divergence angle of the monochromatic light diffused by the diffusion sheet 112 increases, and due to the small-sized arrangement of the light source device 10, the light paths of adjacent monochromatic light intersect, so that different monochromatic light are mutually mixed and affected, and a crosstalk phenomenon occurs, which easily results in the reduction of the light quality of the light source device 10. Referring to fig. 2 and 3, the lens module 12 in the present embodiment may include a plurality of first lenses 121, the plurality of first lenses 121 may be arranged in a predetermined order, and further, the plurality of first lenses 121 may be arranged correspondingly according to an arrangement manner of a plurality of monochromatic light beams emitted from the light source 111, so that each of the monochromatic light beams emitted from the light source 11 may be incident on one of the first lenses 121. The first lens 121 may be an optical lens, i.e., a convex lens, a concave lens, or the like. The plurality of first lenses 121 are located on the light paths of the plurality of diffused monochromatic light rays in a one-to-one correspondence manner, and the plurality of diffused monochromatic light rays are respectively emitted to the corresponding first lenses 121. The plurality of first lenses 121 may be used to separate the plurality of monochromatic light rays such that the plurality of monochromatic light rays are staggered from each other, i.e., the optical paths of the plurality of monochromatic light rays are different from each other, and there is no intermixing or influence between the monochromatic light rays. The monochromatic light is deflected when passing through the first lens 121, and the optical path of the monochromatic light is changed. For example, the monochromatic light at the edge portion of the light source device 10 is emitted toward the edge direction, the monochromatic light at the intermediate portion of the light source device 10 may be directly transmitted through the first lens 121, and the more the angle of deviation of the monochromatic light closer to the edge portion may be made larger, so that the plurality of monochromatic light can be more dispersed. The crosstalk phenomenon easily generated by adjacent monochromatic light is avoided, so that the light quality of the light source device 10 is improved.

For example, the first lenses 121 may be convex lenses, and the plurality of first lenses 121 may perform a converging function on the plurality of monochromatic light beams, so as to avoid an infinite expansion of the monochromatic light beams diffused by the diffusion sheet 112, thereby increasing the volume of the light source device 10. The relative position between the first lens 121 and the diffusion sheet 112 can be adjusted to change the expansion effect for monochromatic light.

It is understood that the deflection angle of the monochromatic light at the first lens 121 needs to be selected and designed according to specific parameters such as the volume of the light source device 10, the number of the light sources 111, and the optical properties of the first lens 121, which is not limited in this embodiment.

In a more specific embodiment, referring to fig. 2, the light source 111 may include a first light source 113, a second light source 114 and a third light source 115 disposed side by side along a second direction, where the second direction may be perpendicular to the first direction, and the second direction is shown as L2, and the first light source 113, the second light source 114 and the third light source 115 are sequentially arranged along the second direction. Illustratively, the first light source 113 may be a red light source, the second light source 114 may be a blue light source, and the third light source 115 may be a green light source. The first light source 113, the second light source 114 and the third light source 115 emit a first light (as indicated by L3 in fig. 2), a second light (as indicated by L4 in fig. 2) and a third light (as indicated by L5 in fig. 2) along a first direction, respectively, and the first light, the second light and the third light are arranged in a second direction. In a more specific embodiment, the first light may be red light, the second light may be blue light, and the third light may be green light. The first light, the second light and the third light may be monochromatic light of other colors, which is not limited in this embodiment, and may be selected according to specific embodiments and implementation requirements.

The plurality of first lenses 121 include a first sub-lens 122, a second sub-lens 123, and a third sub-lens 124, and the first sub-lens 122, the second sub-lens 123, and the third sub-lens 124 may be arranged in an arrangement order of the plurality of monochromatic light rays emitted from the light source 111. The first sub-lens 122, the second sub-lens 123 and the third sub-lens 124 may be three independent optical lenses or different portions based on the same optical device, and the present embodiment is not limited. The first sub-lens 122 is located in the optical path of the first light, and deflects the first light toward a direction away from the second light. The optical axis of the first sub-lens 122 may be parallel to the propagation axis of the first light, the first light is deflected by the first sub-lens 122, and the deflected first light deflects towards a direction away from the second light, and the first sub-lens 122 converges the first light to form a first image point. The second sub-lens 123 is located in the optical path of the second light, the optical axis of the second sub-lens 123 may be collinear with the propagation axis of the second light, the second light may directly penetrate the second sub-lens 123 and continue to propagate along the first direction, and the second sub-lens 123 converges the second light to form a second image point. The third sub-lens 124 is located in the optical path of the third light, and deflects the third light toward a direction away from the second light. The optical axis of the third sub-lens 124 may be parallel to the propagation axis of the third light, the third light is deflected by the third sub-lens 124, and the deflected third light is deflected towards a direction away from the second light, and the third sub-lens 124 converges the third light to form a third image point. After passing through the first lens 121, a certain distance is kept between the first image point and the second image point as well as between the first image point and the third image point, so as to avoid mutual interference among the first light, the second light and the third light.

Preferably, the distance between the light source 111 and the first lenses 121 is 1-2 times the focal length of the first lenses 121. The distance between the light source 111 and the first lenses 121 is prevented from being too close, so that the diffusion sheet 112 is difficult to set, the diffusion effect of the diffusion sheet 112 is further ensured, the light source 111 and the first lenses 121 are prevented from being too far, the volume of the light source device 10 is increased, and the portability of the light source device 10 is ensured.

In this embodiment, referring to fig. 2, the monochromatic light adjusted by the plurality of first lenses 121 propagates to the optical waveguide sheet 13, and the optical waveguide sheet 13 is provided with a coupling-in element 131 and a coupling-out element 132, wherein the coupling-in element 131 can be disposed in the coupling-in region, and the coupling-out element 132 can be disposed in the coupling-out region. The in-coupling element 131 and the out-coupling element 132 may be holographic optical elements (holographic optical elements, HOE). The coupling-in element 131 is used to receive the separated monochromatic light and couple into the optical waveguide sheet 13. The number of the coupling-in elements 131 may be one or more, for example, the number of the coupling-in elements 131 may be 3, and the coupling-in elements 131 may include a first sub-coupling-in element 133, a second sub-coupling-in element 134, and a third sub-coupling-in element 135, where the first sub-coupling-in element 133 may be used to couple in the first light, the second sub-coupling-in element 134 may be used to couple in the second light, and the third sub-coupling-in element 135 may be used to couple in the third light. The plurality of sub-coupling elements may be disposed on the same side of the optical waveguide sheet 13 and arranged in the second direction. I.e. a plurality of monochromatic light rays may be coupled into the optical waveguide sheet 13 from one coupling-in element 131, or a plurality of monochromatic light rays may be coupled into the optical waveguide sheet 13 from a plurality of different coupling-in elements 131, respectively, for facilitating subsequent replacement and maintenance.

Preferably, the diffraction efficiency of the two ends of the coupling element 131 is different due to the fact that the diffraction efficiency of the one end edge of the coupling element 131 is deteriorated due to the influence of the manufacturing process or the characteristics thereof, such as the clamping operation during the mounting; therefore, the dimensions of the first sub-coupling-in element 133, the second sub-coupling-in element 134 and the third sub-coupling-in element 135 are set to be smaller than the spot size formed by the monochromatic light incident thereon, so as to improve the coupling-in efficiency of the monochromatic light. Further, the light spot formed when the first light beam is incident on the first sub-coupling element 133 is close to the end of the first sub-coupling element 133 with high diffraction, the light spot formed when the second light beam is incident on the second sub-coupling element 134 is close to the end of the second sub-coupling element 134 with high diffraction, and the light spot formed when the third light beam is incident on the third sub-coupling element 135 is close to the end of the third sub-coupling element 135 with high diffraction; because the multiple light spots formed by multiple total reflections of the monochromatic light in the coupling-in element 131 need to be disposed adjacently, otherwise, uneven brightness occurs in the field of view of the user, when the light spots formed by the monochromatic light are not close to one end of the corresponding sub-coupling-in element 131, after a part of edge light in the monochromatic light propagates in the direction of the coupling-out area for one time and is totally reflected, a part of edge monochromatic light is totally reflected to the edge area of the coupling-in element 131, and is coupled out from the edge area of the coupling-in element 131, so that energy leakage occurs. Therefore, in this embodiment, by disposing the light spot formed by the monochromatic light near one end of the coupling-in element 131, the energy leakage is reduced while the coupling-in efficiency is ensured.

But because the angular spectrum of the coupling-in element 131 is narrower, i.e. the coupling-in element 131 is relatively angular sensitive. The monochromatic light rays exiting through the first lens 121 may deviate from the exposure angle of the coupling-in element 131, resulting in a rapid decrease in propagation efficiency. Referring to fig. 2 and fig. 3, the lens module 12 in the present embodiment further includes a plurality of second lenses 125, the plurality of second lenses 125 are disposed on the light-emitting paths of the plurality of first lenses 121 in a one-to-one correspondence manner, and the plurality of second lenses 125 can be used for collimating the first light, the second light and the third light transmitted through the plurality of first lenses 121, so that the first light, the second light and the third light are incident to the coupling-in element 131 at a first angle. The first angle is an incident angle of the light beam on the coupling-in element 131, and the position of the second lens 125 or the second lens 125 with different parameters can be adjusted according to the requirement of the user, so as to change the first angle. For example, the first angle may be 0 °, and the first light, the second light, and the third light may be coupled into the coupling-in element 131 perpendicular to the optical waveguide sheet 13. The plurality of second lenses 125 can enable the plurality of monochromatic light rays such as the first light ray, the second light ray, and the third light ray to accurately reach the coupling-in element 131 at a specific angle, thereby improving the efficiency of the entire system to some extent. At the same time, the presence of the plurality of second lenses 125 also reduces the angular sensitivity of the light rays exiting the plurality of first lenses 121, improving the stability of the system. This configuration can greatly reduce the loss of light energy due to angular deviation, and improve the propagation efficiency and coupling effect of light.

In a more specific embodiment, referring to fig. 2, the plurality of second lenses 125 includes a fourth sub-lens 126, a fifth sub-lens 127 and a sixth sub-lens 128, and the fourth sub-lens 126, the fifth sub-lens 127 and the sixth sub-lens 128 may be distributed along the second direction. The fourth sub-lens 126 is disposed between the first sub-lens 122 and the optical waveguide sheet 13, and the optical axis of the fourth sub-lens 126 is offset from the optical axis of the first sub-lens 122, for example, the optical axis of the fourth sub-lens 126 is located at a side of the optical axis of the first sub-lens 122 away from the second sub-lens 123, and the optical axis of the fourth sub-lens 126 is disposed parallel to the optical axis of the first sub-lens 122. The fourth sub-lens 126 is located in the optical path of the first light, and the first light passing through the first sub-lens 122 is adjusted by the fourth sub-lens 126 to change the exit angle of the first light. The image point of the first light passing through the first sub-lens 122 is located on the focal plane of the fourth sub-lens 126, the first light is incident on the coupling-in element 131 at a first angle within a certain range, and further, when the first angle is 0 degrees, that is, the first light is perpendicularly incident on the coupling-in element 131, the image point of the first light passing through the first sub-lens 122 is located on the focal point of the fourth sub-lens 126, and the first light can be collimated by the common adjustment of the first sub-lens 122 and the fourth sub-lens 126, so that the first light is perpendicularly emitted to the coupling-in element 131. The fifth sub-lens 127 is disposed between the second sub-lens 123 and the optical waveguide sheet 13, and the fifth sub-lens 127 and the second sub-lens 123 have the same optical axis, and the optical axis of the fifth sub-lens 127 is perpendicular to the coupling-in element 131, so that the second light passing through the fifth sub-lens 127 can be emitted to the coupling-in element 131 perpendicularly. The sixth sub-lens 128 is disposed between the third sub-lens 124 and the optical waveguide sheet 13, and the optical axis of the sixth sub-lens 128 is offset from the optical axis of the third sub-lens 124. For example, the optical axis of the sixth sub-lens 128 is located at a side of the optical axis of the third sub-lens 124 away from the second sub-lens 123, and the optical axis of the sixth sub-lens 128 is disposed parallel to the optical axis of the third sub-lens 124. The sixth sub-lens 128 is located in the optical path of the third light, and the third light passing through the third sub-lens 124 is adjusted by the sixth sub-lens 128 to change the exit angle of the third light. The image point of the third light passing through the third sub-lens 124 is located on the focal plane of the sixth sub-lens 128, the third light is incident on the coupling-in element 131 at a first angle within a certain range, and further, when the first angle is 0 degrees, that is, when the third light is perpendicularly incident on the coupling-in element 131, the image point of the third light passing through the third sub-lens 124 is located on the focal point of the sixth sub-lens 128, and the third light can be collimated by the common adjustment of the third sub-lens 124 and the sixth sub-lens 128, which are in a relative positional relationship, so as to be perpendicularly emitted to the coupling-in element 131.

The plurality of monochromatic light rays are coupled into the optical waveguide sheet 13 by the coupling-in element 131, the plurality of monochromatic light rays are totally reflected at the optical waveguide sheet 13, the optical waveguide sheet 13 may comprise a first surface and a second surface opposite to each other, and may propagate from one end of the optical waveguide sheet 13 to the other end of the optical waveguide sheet 13 and/or from the first surface to the second surface of the optical waveguide sheet 13 until the plurality of monochromatic light rays propagate onto the coupling-out element 132. The plurality of monochromatic light rays are coupled out of the optical waveguide sheet 13 through the coupling-out element 132 and exit toward the spatial light modulator 20, and the spatial light modulator 20 is configured to receive the plurality of monochromatic light rays coupled out of the coupling-out element 132, and modulate the monochromatic light rays to form image light, so as to implement image light modulation. Specifically, under the influence of the coupling-out element 132, the plurality of monochromatic light rays are adjusted so that the total reflection of the monochromatic light rays in the optical waveguide sheet 13 is stopped, and the plurality of monochromatic light rays are refracted from the surface of the optical waveguide sheet 13 so that the monochromatic light rays are emitted into the spatial light modulator 20. At the same time, some light is reflected on the surface of the optical waveguide sheet 13, but still exits to the spatial light modulator 20 after multiple reflections, so as to improve the energy utilization.

Referring to fig. 1 and 2, the spatial light modulator 20 is a device for modulating the light field distribution of light waves, and is widely used in various fields of optical information processing, beam transformation, output display, and the like. In one embodiment, referring to fig. 2, the light source device 10 emits a light beam in a predetermined direction, and the light beam is an illumination light beam (e.g., L6 in fig. 2). The spatial light modulator 20 is disposed on the optical path of the outgoing light, and the spatial light modulator 20 includes a plurality of individual units (individual optical units) that are spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by an optical signal or an electrical signal, and the optical characteristics of the unit can be changed by various physical effects (a pockels effect, a kerr effect, an acousto-optic effect, a magneto-optic effect, a semiconductor self-electro-optic effect or a photorefractive effect, etc.), so that the illumination light beams illuminating a plurality of independent units are modulated, and an image light beam (such as L7 in fig. 2) is output. In this embodiment, the spatial light modulator 20 may be a Digital Micro-mirrorDevice (DMD), a liquid-crystal-on-silicon panel (LCOSPanel), a transmissive liquid crystal panel, or the like.

In one embodiment, since the diffraction efficiency of the two ends of the coupling element 131 is different, the coupling efficiency of the coupling element 131 for coupling the monochromatic light can be improved by disposing the end with high diffraction efficiency of the coupling element 131 close to the spatial light modulator 20.

The plurality of first lenses 121 in the present embodiment can adjust the plurality of monochromatic light beams to avoid the mutual influence of the plurality of monochromatic light beams, and the plurality of second lenses 125 can collimate the plurality of monochromatic light beams so as to make the plurality of monochromatic light beams incident to the coupling-in element 131 at a first angle and couple into the coupling-in element 131, so as to ensure that the plurality of monochromatic light beams meet the angle requirement of the coupling-in element 131, thereby improving the propagation efficiency of the monochromatic light beams and ensuring the picture quality of the wearable device 1.

To further reduce the volume of the light source device 10, the portability of the wearable apparatus 1 is improved. Referring to fig. 3, in another embodiment, the coupling-in element 131 and the light source assembly 11 are disposed on two opposite sides of the optical waveguide sheet 13, that is, the coupling-in element 131 is disposed on the first surface of the optical waveguide sheet 13, the light source assembly 11 is disposed on the second surface of the optical waveguide sheet 13, and the monochromatic light may be light with a first polarization state, that is, the first light, the second light, and the third light are all light with the first polarization state, and the first polarization state may be polarized light with a P polarization state. Or the monochromatic light may be light of other polarization states, for example, the monochromatic light may also be light of a second polarization state, the second polarization state may be light of S polarization state, and the polarization directions of the P polarization light and the S polarization light are orthogonal to each other. In one embodiment, the light source device 10 may further be provided with a polarization conversion device disposed between the light source 111 and the diffusion sheet 112 or between the diffusion sheet 112 and the first lens 121, and located on the optical path of the monochromatic light. The polarization conversion device may be a half-wave plate, and the polarization conversion device is configured to convert the first polarized light into the second polarized light, specifically, the light source 111 emits the first polarized light, where the first polarized light may be P polarized light, and the second polarized light converted by the polarization conversion device may be S polarized light.

With continued reference to fig. 3, the light source device 10 further includes a polarization conversion layer 14, where the polarization conversion layer 14 is disposed on a side of the coupling-in element 131 away from the optical waveguide sheet 13, and in this embodiment, the coupling-in element 131 only performs an angular deviation function on the light of the second polarization state, but does not perform an adjustment on the light of the first polarization state. The monochromatic light can directly pass through the coupling-in element 131 and enter the polarization conversion layer 14. The plurality of second lenses 125 are configured to reflect the monochromatic light toward the coupling-in element 131, where the monochromatic light is converted into light of a second polarization state. The plurality of second lenses 125 collimate the monochromatic light, so that the monochromatic light is incident on the optical waveguide sheet 13 at a first angle and coupled into the coupling-in element 131, wherein the first angle is an incident angle of the light on the coupling-in element 131, and may be configured to be 0 ° according to a subsequent optical path requirement, i.e. the monochromatic light is coupled into the coupling-in element 131 perpendicular to the optical waveguide sheet 13. Meanwhile, when the monochromatic light propagates to the coupling-in element 131, the monochromatic light is adjusted by the coupling-in element 131, so that the monochromatic light propagates through the optical waveguide sheet 13 by total reflection until reaching the coupling-out element 132. In contrast, since the coupling element 131 and the light source assembly 11 are located on opposite sides of the optical waveguide sheet 13, the propagation range of the monochromatic light can be effectively reduced, which is beneficial to the small-volume arrangement of the light source device 10, and thus the wearable device 1 can be more portable.

Specifically, referring to fig. 3, the polarization conversion layer 14 may be a quarter-wave plate, and the quarter-wave plate is attached to an end of the coupling-in element 131 away from the optical waveguide sheet 13. The first light, the second light and the third light sequentially pass through the coupling-in element 131 and the polarization conversion layer 14, but the coupling-in element 131 does not adjust the first light, the second light and the third light because the first light, the second light and the third light are light with the first polarization state. In one embodiment, the coupling-in element 131 may include a first sub-coupling-in element 133, a second sub-coupling-in element 134 and a third sub-coupling-in element 135, wherein the first light is reflected by the fourth sub-lens 126 to the first sub-coupling-in element 133 through the polarization conversion layer 14, the second light is reflected by the fourth sub-lens 126 to the second sub-coupling-in element 134 through the polarization conversion layer 14, the third light is reflected by the fourth sub-lens 126 to the third sub-coupling-in element 135 through the polarization conversion layer 14, and the first light, the second light and the third light pass through the polarization conversion layer 14 twice during this period. The first light, the second light and the third light can be converted into the first polarized light from the second polarized light, namely, the polarized light in the S direction is converted into the polarized light in the P direction, so that the conversion of the polarized directions of the first light, the second light and the third light is realized. The plurality of coupling-in elements 131 can angle-deflect the first light, the second light and the third light to satisfy the condition that the incident angles of the first light, the second light and the third light are larger than the total reflection angle of the optical waveguide sheet 13, so that the first light, the second light and the third light can be totally reflected and propagated in the optical waveguide sheet 13 until the coupling-out element 132.

In the embodiment of the application, the plurality of second lenses 125 are disposed on one side of the optical waveguide sheet 13 far away from the light source 111, and the coupling element 131 does not couple the plurality of monochromatic light into the optical waveguide sheet 13 because the plurality of monochromatic light emitted from the light source 111 is the second polarized light, the monochromatic light can continue to expand according to a certain angle, and after the expansion is completed, the monochromatic light is reflected by the plurality of second lenses 125 into the coupling element 131 and coupled into the optical waveguide sheet 13 through the coupling element 131. Since the monochromatic light continues to exit in the optical waveguide sheet 13, the area volume required for expanding the monochromatic light can be reduced, and the volume of the light source device 10 can be effectively reduced, so that the wearable device 1 can be more portable.

In the light source device 10 and the wearable apparatus 1 provided in the embodiments of the present application, the light source 111 emits a plurality of monochromatic light beams along the first direction, the lens module 12 includes a plurality of first lenses 121, the plurality of first lenses 121 are located on the optical paths of the plurality of monochromatic light beams in a one-to-one correspondence manner, and the optical waveguide sheet 13 is provided with the coupling element 131. The light source emits a plurality of monochromatic light beams, the first lens 121 can separate the plurality of monochromatic light beams so as to enable the plurality of monochromatic light beams to be staggered, so that crosstalk phenomenon of adjacent monochromatic light beams is avoided, the light quality of the light source device 10 is improved, the size of the light source device 10 is not obviously increased, and the miniature setting of the wearable equipment 1 is facilitated.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and they should be included in the protection scope of the present application.

Claims (12)

1. A light source device, comprising:

A light source assembly including a light source emitting a plurality of monochromatic light rays in a first direction;

The lens module comprises a plurality of first lenses, wherein the first lenses are positioned on the light paths of the plurality of monochromatic light rays in a one-to-one correspondence manner and are used for separating the plurality of monochromatic light rays so as to enable the plurality of monochromatic light rays to be staggered; and

An optical waveguide sheet provided with a coupling-in element for receiving the separated monochromatic light and coupling-out element into the optical waveguide sheet.

2. The light source device according to claim 1, wherein the light source includes a first light source, a second light source, and a third light source arranged side by side along a second direction, the first light source, the second light source, and the third light source emit a first light ray, a second light ray, and a third light ray along the first direction, respectively, the plurality of first lenses includes a first sub-lens, a second sub-lens, and a third sub-lens, the first sub-lens is located in an optical path of the first light ray and deflects the first light ray toward a direction away from the second light ray, the second sub-lens is located in an optical path of the second light ray, and the third sub-lens is located in an optical path of the third light ray and deflects the third light ray toward a direction away from the second light ray.

3. The light source device according to claim 2, wherein the lens module further comprises a plurality of second lenses, the plurality of second lenses are located on the light outgoing paths of the plurality of first lenses in a one-to-one correspondence manner, and the plurality of second lenses are configured to collimate the first light, the second light, and the third light transmitted through the plurality of first lenses so that the first light, the second light, and the third light are incident to the coupling-in element at a first angle.

4. A light source device according to claim 3, wherein the plurality of second lenses includes a fourth sub-lens, a fifth sub-lens, and a sixth sub-lens, the fourth sub-lens is disposed between the first sub-lens and the optical waveguide sheet, and an optical axis of the fourth sub-lens is offset from an optical axis of the first sub-lens, the fifth sub-lens is disposed between the second sub-lens and the optical waveguide sheet, and the fifth sub-lens is coaxial with the second sub-lens, and the sixth sub-lens is disposed between the third sub-lens and the optical waveguide sheet, and an optical axis of the sixth sub-lens is offset from an optical axis of the third sub-lens.

5. The light source device according to claim 4, wherein an optical axis of the fourth sub-lens is located on a side of the optical axis of the first sub-lens away from the second sub-lens, and the optical axis of the fourth sub-lens is parallel to the optical axis of the first sub-lens, an optical axis of the sixth sub-lens is located on a side of the optical axis of the third sub-lens away from the second sub-lens, and the optical axis of the sixth sub-lens is parallel to the optical axis of the third sub-lens.

6. The light source device according to claim 4, wherein an image point of the first light transmitted through the first sub-lens is located on a focal plane of the fourth sub-lens, an image point of the second light transmitted through the second sub-lens is located on a focal plane of the fifth sub-lens, and an image point of the third light transmitted through the third sub-lens is located on a focal plane of the sixth sub-lens.

7. A light source device as recited in claim 3, wherein said coupling-in element and said light source assembly are positioned on opposite sides of said optical waveguide sheet, said first light ray, said second light ray and said third light ray being all light of a first polarization state;

The light source device further comprises a polarization conversion layer, the polarization conversion layer is arranged on one side, far away from the optical waveguide sheet, of the coupling-in element, the monochromatic light transmitted through the first lens passes through the optical waveguide sheet and enters the polarization conversion layer to be converted into light with a second polarization state, and the plurality of second lenses are used for reflecting and collimating the converted light with the second polarization state towards the coupling-in element so that the light is coupled into the coupling-in element in a mode that the light is incident to the optical waveguide sheet at the first angle.

8. A light source device according to any one of claims 3-7, wherein the incoupling element comprises a first sub incoupling element for incoupling the first light, a second sub incoupling element for incoupling the second light, and a third sub incoupling element for incoupling the third light; the diffraction efficiency of the two ends of the first sub-coupling-in element, the second sub-coupling-in element and the third sub-coupling-in element is different; the size of a light spot formed when the first light is incident to the first sub-coupling-in element is smaller than that of the first sub-coupling-in element, and the light spot formed when the first light is incident to the first sub-coupling-in element is close to one end of the first sub-coupling-in element, which is high in diffraction; the size of a light spot formed when the second light rays are incident to the second sub-coupling-in element is smaller than that of the second sub-coupling-in element, and the light spot formed when the second light rays are incident to the second sub-coupling-in element is close to one end of the second sub-coupling-in element, which is high in diffraction; the size of a light spot formed when the third light is incident to the third sub-coupling-in element is smaller than that of the third sub-coupling-in element, and the light spot formed when the third light is incident to the third coupling-in element is close to one end of the third sub-coupling-in element with high diffraction.

9. A light source device according to any one of claims 3-7, wherein the first angle is 0 °.

10. A light source device according to claim 1, wherein a distance between the light source and the first lens is 1-2 times a focal length of the first lens.

11. The light source device according to claim 1, wherein the light source assembly further comprises a diffusion sheet for diffusing the plurality of monochromatic light rays emitted from the light source, and the plurality of first lenses are located on the light paths of the diffused plurality of monochromatic light rays in one-to-one correspondence.

12. A wearable device, comprising:

the light source device according to any one of claims 1 to 11; and

The spatial light modulator is used for receiving the light rays coupled out from the coupling-out element and modulating the light rays to form image light, wherein diffraction efficiencies at two ends of the coupling-in element are different, and one end with high diffraction efficiency of the coupling-in element is arranged close to the spatial light modulator.