CN211979334U

CN211979334U - Near-to-eye display device and electronic equipment

Info

Publication number: CN211979334U
Application number: CN202020595816.4U
Authority: CN
Inventors: 杨神武; 周兴; 王兆民; 曹炳辰
Original assignee: Shenzhen Orbbec Co Ltd
Current assignee: Orbbec Inc
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-11-20
Anticipated expiration: 2030-04-20

Abstract

The utility model discloses a near-to-eye display device and electronic equipment, the device includes: the coupling-in area is used for coupling in incident beams within a preset angle range; a transfer region for receiving and transferring the incident light beam coupled in through the coupling-in region; a coupling-out region for coupling out the light beam transmitted through the transmission region; an optical modulation element configured to shift an optical axis and modulate the light beam coupled out of the coupling-out region into a divergent light beam; an optical compensation element located on an opposite side of the optical modulation element relative to the transfer region, configured to compensate for aberrations caused by the transfer region and the optical modulation element. The electronic equipment comprises the near-eye display device.

Description

Near-to-eye display device and electronic equipment

Technical Field

The utility model relates to an optical waveguide technical field especially relates to a near-to-eye display device and electronic equipment.

Background

In the prior art, a basic method for displaying a 3D image is to display two slightly offset images to the left and right eyes, respectively, and modulate parallel light coupled out through a coupling-out area into divergent light, but the binocular overlapping area is too small, so that the problem of binocular conflict is easily caused, and image fusion cannot be performed to display a 3D virtual image. For this reason, the conventional improvement is to rotate the left and right display modules to increase the binocular overlapping area, but this method has difficulty in aligning the left eye image and the right eye image with each other, which may reduce the quality of the combination of the two images in the brain of the viewer and increase eye fatigue.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a near-to-eye display device and an electronic apparatus, so as to solve at least one problem existing in the prior art.

In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:

a near-eye display device comprising: the coupling-in area is used for coupling in incident beams within a preset angle range; a transfer region for receiving and transferring the incident light beam coupled in through the coupling-in region; a coupling-out region for coupling out the light beam transmitted through the transmission region; an optical modulation element configured to shift an optical axis and modulate the light beam coupled out of the coupling-out region into a divergent light beam; an optical compensation element located on an opposite side of the optical modulation element relative to the transfer region, configured to compensate for aberrations caused by the transfer region and the optical modulation element.

In some embodiments, the coupling-in region and the coupling-out region comprise diffractive optical elements, or surface relief gratings or volume holographic gratings of sub-wavelength periodic structure size.

In some embodiments, the coupling-in region and/or the coupling-out region is disposed on the transfer region inner surface and/or the transfer region outer surface.

In some embodiments, the transmission region includes an optical glass, an optical resin material, or a substrate coated with a total reflection material to realize total reflection transmission of the incident light beam.

In some embodiments, the optical modulation element is an eccentric lens.

In some embodiments, the display device further comprises an image display module for emitting a light beam for virtually displaying an image, i.e., the incident light beam.

In some embodiments, the image display module comprises an illumination element, an image former, and a lens, wherein: the image former is backlit by the illumination elements and uses either transmissive projection or reflection to produce the virtual display image; the lens is disposed at a front end of the image former, and is configured to receive the virtual display image from the image former to collimate, converge, or diverge signal light of the virtual display image.

In some embodiments, the illumination element further comprises a red LED, a green LED, and a blue LED to form a red component, a green component, and a blue component, respectively, of the virtual display image.

In some embodiments, the lens comprises a combination of one or more of a spherical lens, an aspherical lens, and a fresnel lens.

The utility model discloses a another technical scheme does:

an electronic device comprises the near-eye display device.

The utility model discloses technical scheme's beneficial effect is: by providing the optical modulation element, the optical axis of the parallel light beam incident to the eye can be shifted, and the parallel light beam is modulated into a divergent light beam, so that the binocular overlapping region can be increased more easily; the optical compensation element is arranged on the opposite side of the optical modulation element, so that the aberration caused by the transmission area and the optical modulation element can be compensated, a viewer can view a target object in the real world without aberration, and the quality of combination of left and right eye images in the brain of the viewer is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a near-eye display device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an exemplary concave lens;

fig. 3 is a schematic diagram of an exemplary off-center lens used in a near-eye display device of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It will be further understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner" and "outer" refer to an orientation or positional relationship as shown in the drawings, which are used for convenience in describing and simplifying the invention, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the invention.

Fig. 1 is a schematic structural diagram of a near-eye display device (hereinafter referred to as "device") according to an embodiment of the present invention. The device 100 (simply referred to as "device 100") includes a coupling-in region 101, a transfer region 102, a coupling-out region 103, an optical modulation element 104, and an optical compensation element 106. It should be understood that the device 100 includes two symmetrical parts corresponding to the left and right eyes, and the structure of the left and right parts is completely symmetrical, so that the same elements of the left and right parts of the device are labeled by the same numerals, and the specific structure and the operation principle of the device will be described on the basis of one side (for example, the left part) in the following description.

With continued reference to fig. 1, the coupling-in region 101 is used for coupling in an incident light beam with a predetermined angle range; the transfer region 102 is used for receiving and transferring the incident light beam coupled in through the coupling-in region 101; the coupling-out region 103 is used for coupling out the light beam transmitted by the transmission region 102; the optical modulation element 104 is located between the coupling-out region 103 and an eye 105 of a viewer, and is configured to shift the optical axis and modulate the light beam coupled out of the coupling-out region 103 into a divergent light beam; the optical compensation element 106 is located on the opposite side of the optical modulation element 104 with respect to the transfer region 102 and is configured to compensate for aberrations caused by the transfer region 102 and the optical modulation element 104.

In some embodiments, the coupling-in region 101 and the coupling-out region 103 may include Diffractive Optical Elements (DOEs), and may be surface relief gratings or volume holographic gratings composed of structures with sub-wavelength periods in size. The in-coupling region 101 and the out-coupling region 103 can split and redirect the light beam, the splitting (referred to as the optical order) and the angular variation depending on the characteristics of the diffraction grating. In addition, the size of the coupling-out region 103 can be determined according to the exit pupil size and characteristics of the optical device, and is not limited herein.

In some embodiments, the transmission region 102 includes optical glass, optical resin material (such as BK-7 glass, etc.), or substrate coated with total reflection material to realize total reflection transmission of incident light beam. When the incident light beam is larger than the critical angle of total reflection of the substrate, the incident light beam can realize total reflection in the substrate. In the present embodiment, when the diffraction angle of the incident beam is larger than the critical angle of total reflection inside the transmission region 102 after the incident beam is diffracted by the coupling-in region 101, the beam will realize total reflection inside the transmission region 102. It should be understood that the device 100 may include one layer of the delivery region 102, and may also include multiple layers of the delivery region 102, without limitation.

The optical modulation element 104 can appropriately adjust the wavefront of the light output by the transfer region 102 and modulate the light beam coupled out by the coupling-out region 103 into a diverging light beam, thereby allowing the viewer's eye to correctly focus the light. The optical modulation element 104 is in the optical path between the outcoupling region 103 and the eye 105 of the viewer and modifies the wavefront of the light outcoupled through the outcoupling region 103, thereby causing aberrations when the viewer views a real object. To correct such aberrations, an optical compensation element 106 is disposed opposite the optical modulation element 104 on the other side of the delivery zone 102 to adjust the wavefront of light from real world objects in the surrounding environment (as indicated by the dashed line through the optical compensation element 106 in fig. 1) to compensate for the aberrations of the delivery zone 102 and the optical modulation element 104.

In some embodiments, the optical modulation element 104 is an eccentric lens. As shown in fig. 2, which is a schematic structural diagram of a concave lens 200, the concave lens 200 includes a plane 201 and a concave surface 202, and a center 203 is disposed on a central axis of the concave lens 200. When a parallel light beam enters from the plane 201 of the concave lens 200, the concave lens 200 modulates the parallel light beam into a divergent light beam, the reverse extension line of the divergent light beam intersects with the center 203 of the concave lens 200, and the central axis of the concave lens 200 is referred to as the optical axis 204 of the incident parallel light beam. Based on the concave lens 200, an edge portion (e.g., a right portion in fig. 2) of the concave lens 200 is cut, for example, the cut portion occupies a quarter of the entire concave lens 200, and the cut portion can be adjusted according to practical situations, which is not limited herein. The concave lens 200 is cut to obtain the eccentric lens 205 as shown in fig. 3, when the eccentric lens 205 is compared with the concave lens 200, the central axis of the eccentric lens 205 is changed, when a parallel light beam enters the plane 206 of the eccentric lens 205, the eccentric lens 205 modulates the parallel light beam into a divergent light beam and emits the divergent light beam through the concave surface 207, the reverse extension line of the divergent light beam intersects with a point 208, the point 208 has a certain offset distance with the central axis 209 of the eccentric lens 205, the central axis 209 of the eccentric lens 205 is compared with the concave lens 200, the central axis 209 of the eccentric lens 205 has a certain offset, namely the optical axis is offset, and the optical axis of the eccentric lens 205 is no longer the central axis 209. Therefore, with such an eccentric lens as the optical modulation element 104, the left-eye display image and the right-eye display image can be shifted to increase the binocular overlapping area.

As shown in fig. 1, in some embodiments, the apparatus 100 may further include an image display module 107 for emitting a light beam of a virtual display image, i.e., emitting an incident light beam to the coupling-in area 101. The image display module 107 includes an illumination element 1071, an image former 1072, and a lens 1073. The image former 1072 may utilize a transmission projection technique or a reflection technique to generate a virtual display image. When implemented using transmissive projection technology, whose light source is modulated by an optically active material and the backlight is white light (which may be provided by illumination element 1071), this technology is typically implemented using a Liquid Crystal Display (LCD) type display with powerful backlight and high optical density. When implemented using reflective technology, its external light is reflected and modulated by the optically active material. The illumination element 1071 may further include red, green, and blue LEDs, in addition to illumination and the above-described function of providing backlight, to form red, green, and blue components of a virtual display image, respectively. A lens 1073, which may be one or a combination of two or more of a spherical lens, an aspherical lens, and a fresnel lens, etc., is disposed at the front end of the image former 1072 for receiving the virtual display image from the image former 1072 to collimate, converge, or diverge the signal light of the virtual display image. It should be understood that the image former alone in combination with the illumination element 1071 may also be referred to as a microdisplay. In addition, the image former 1072 may also be composed of a laser and a MEMS micro-mirror, which is not limited herein.

Referring to fig. 1, in an embodiment, the image display module 107 emits a parallel light beam 20 having a virtual image to the coupling-in region 101, the parallel light beam is diffracted by the coupling-in region 101 and then enters the transmission region 102 at an angle, the light beam 20 is totally reflected in the transmission region 102 to the coupling-out region 103 for a plurality of times, the light beam 20 is diffracted by the coupling-out region 103 and then enters the optical modulation element 104 in the form of a parallel light beam 21, the optical modulation element 104 modulates the parallel light beam 21 into a divergent light beam 22 to an eye 105 of a viewer, and due to a shift of an optical axis of the optical modulation element 104, when the parallel light beam 21 is modulated into the divergent light beam 22, the virtual image passing through the optical modulation element 104 is shifted, so that the divergent light beam 22 with the virtual image respectively entering the left eye and the right eye of the viewer is shifted (the left eye is shifted to the right, and the right eye is shifted. Meanwhile, the optical compensation element 106 compensates for the aberration caused by the transmission region 102 and the optical modulation element 104, so that the observer can view the external real object without aberration. It should be noted that the optical modulation element 104 and the optical compensation element 106 may also be a liquid crystal lens or an adaptive optical element that performs the same function, and are not limited herein.

It should be noted that the coupling-in region 101 and the coupling-out region 103 may be embedded in the transfer region 102 (inner surface) or may be disposed on the outer surface thereof.

It should be noted that the positions of the image display module 107, the coupling-in area 101, and the coupling-out area 103 are not limited to those shown in fig. 1, and the image display module 107 and the coupling-in area 101 may also be disposed on the other side of the transmission area 102 (i.e., above the transmission area 102 in fig. 1). The present application does not specifically limit the specific positions of the image display module 107 and the coupling-out region 103 in the near-eye display device, nor the angle of the outgoing light of the device 100, etc., as long as the final output light of the device 100 is directed toward the eyes of the viewer.

Another embodiment of the present invention further provides an electronic device, which may include the near-eye display device. The electronic device includes, but is not limited to, a wearable device, such as a head mounted display device. Head mounted displays include, but are not limited to, enhanced Reality (AR) devices or heads-up displays, and the like.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A near-eye display device, comprising:

the coupling-in area is used for coupling in incident beams within a preset angle range;

a transfer region for receiving and transferring the incident light beam coupled in through the coupling-in region;

a coupling-out region for coupling out the light beam transmitted through the transmission region;

an optical modulation element configured to shift an optical axis and modulate the light beam coupled out of the coupling-out region into a divergent light beam;

an optical compensation element located on an opposite side of the optical modulation element relative to the transfer region, configured to compensate for aberrations caused by the transfer region and the optical modulation element.

2. The near-eye display device of claim 1, wherein the in-coupling region and the out-coupling region comprise diffractive optical elements, or surface relief gratings or volume holographic gratings of structures with dimensions of sub-wavelength periods.

3. The near-eye display device according to claim 1, wherein the coupling-in region and/or the coupling-out region is disposed on an inner surface of the transfer region and/or an outer surface of the transfer region.

4. The near-eye display device according to claim 1, wherein the transfer region comprises optical glass, an optical resin material, or a substrate coated with a total reflection material to achieve total reflection transfer of the incident light beam.

5. The near-eye display device of claim 1, wherein the optical modulation element is an eccentric lens.

6. The near-eye display device of claim 1, further comprising an image display module for emitting a light beam for virtually displaying an image, i.e., the incident light beam.

7. The near-eye display device of claim 6, wherein the image display module comprises an illumination element, an image former, and a lens, wherein:

the image former is backlit by the illumination elements and uses either transmissive projection or reflection to produce the virtual display image;

the lens is disposed at a front end of the image former, and is configured to receive the virtual display image from the image former to collimate, converge, or diverge signal light of the virtual display image.

8. The near-eye display device of claim 7, wherein the illumination element further comprises a red LED, a green LED, and a blue LED to form a red component, a green component, and a blue component, respectively, of the virtual display image.

9. The near-eye display device of claim 7, wherein the lens comprises a combination of one or more of a spherical lens, an aspherical lens, and a Fresnel lens.

10. An electronic device comprising the near-eye display device of any one of claims 1-9.