CN211086808U - Optical waveguide near-to-eye display device and electronic equipment - Google Patents
Optical waveguide near-to-eye display device and electronic equipment Download PDFInfo
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- CN211086808U CN211086808U CN201922303745.6U CN201922303745U CN211086808U CN 211086808 U CN211086808 U CN 211086808U CN 201922303745 U CN201922303745 U CN 201922303745U CN 211086808 U CN211086808 U CN 211086808U
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Abstract
The utility model is suitable for an optics technical field provides a nearly eye display device of optical waveguide and electronic equipment, and this nearly eye display device of optical waveguide includes: a display engine for emitting signal light of a virtual display image; an optical waveguide element for propagating the signal light; and a diffractive optical element for coupling out the signal light propagating through the optical waveguide element; wherein the optical waveguide element has a slope; the inclined plane refractively couples the signal light into the optical waveguide element; or the inclined surface is used for reflecting the signal light entering the optical waveguide element; the traditional coupling grating is cancelled, so that the obvious energy loss of the signal light caused by diffraction at the coupling grating is avoided, the signal light energy loss of the optical waveguide near-to-eye display device can be reduced, and the improvement of the diffraction efficiency and the display brightness of the optical waveguide near-to-eye display device is facilitated; the electronic equipment based on the optical waveguide near-eye display device has high diffraction efficiency and display brightness.
Description
Technical Field
The utility model relates to the field of optical technology, in particular to optical waveguide near-to-eye display device and electronic equipment.
Background
The existing optical waveguide near-eye display technology can be mainly divided into an array optical waveguide and a diffraction optical waveguide. The array optical waveguide technology has complex process and poor mass production, and bright and dark stripes are easy to appear in a display area. The diffraction light waveguide technology has a wide exit pupil range, relatively high mass production, and no light and dark stripes, and is considered as the most promising near-to-eye display scheme of the optical waveguide.
However, the disadvantage of the known diffractive optical waveguide technology is the low coupling efficiency, in particular in the coupling-in region. In the process of light beam coupling, because only 1 st-order diffracted light is used, most energy of other light is lost, the whole light energy utilization rate is low, and the display brightness of the diffracted light waveguide device is not high enough.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a near-to-eye display device of optical waveguide aims at solving the technical problem that the light energy utilization rate of current diffraction optical waveguide is low, demonstration luminance is low.
The utility model discloses a realize like this, a near-to-eye display device of optical waveguide, include:
a display engine for emitting signal light of a virtual display image;
an optical waveguide element for propagating the signal light; and
a diffractive optical element for coupling out the signal light propagating through the optical waveguide element;
wherein the optical waveguide element has a slope; the inclined plane refractively couples the signal light into the optical waveguide element; or the inclined surface is used to reflect the signal light entering the optical waveguide element.
In one embodiment, the inclined plane is an incident plane of the optical waveguide element, and the signal light is refractively coupled into the optical waveguide by the incident plane; and an included angle between the incident surface and the propagation direction of the signal light in the optical waveguide element is an acute angle or an obtuse angle.
In one embodiment, an antireflection film is arranged on the incident surface and used for reducing stray light.
In one embodiment, the display engine comprises:
a display screen for displaying an image;
the image former is used for emitting a virtual display image outwards by using a transmission projection technology or a reflection technology; and
a lens that receives the transmitted virtual display image from the image former to collimate, transmit, or converge the virtual display image and transmits the signal light toward the optical waveguide element.
In one embodiment, the diffractive optical element is embedded in the optical waveguide element or is disposed on an outer surface of the optical waveguide element.
In one embodiment, the inclined plane is a reflection plane of the optical waveguide element, the optical waveguide element further has a light incident plane connected to the reflection plane at an acute angle, and the signal light is coupled into the optical waveguide by the light incident plane and reflected by the reflection plane.
In one embodiment, the reflecting surface is coated with a reflecting film for reflecting the incident signal light.
In one embodiment, an angle between the inclined surface and a propagation direction of the signal light in the optical waveguide element is set to be a beam angle at which the signal light is reflected or refracted is greater than or equal to a beam angle at which the signal light can be totally reflected in the optical waveguide.
Another object of the present invention is to provide an electronic device, including the optical waveguide near-eye display device according to the above embodiments.
In one embodiment, the electronic device is a wearable display device.
The utility model discloses implement near-to-eye display device of optical waveguide and electronic equipment who provides and beneficial effect lies in:
the optical waveguide element in the optical waveguide near-eye display device is provided with an inclined plane, the inclined plane is used for reflecting signal light entering the optical waveguide element or refracting and coupling the signal light into the optical waveguide element, a traditional coupling grating is omitted, the obvious energy loss of the signal light caused by diffraction at the coupling grating is avoided, the signal light energy loss of the optical waveguide near-eye display device can be reduced, and the diffraction efficiency and the display brightness of the optical waveguide near-eye display device are improved; the electronic equipment based on the optical waveguide near-eye display device has high diffraction efficiency and display brightness.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional optical waveguide near-eye display device;
fig. 2 is a schematic structural diagram of an optical waveguide near-to-eye display device according to the present invention;
fig. 3 is a schematic structural diagram of another optical waveguide near-to-eye display device according to the present invention.
The designations in the figures mean:
100-diffractive optical waveguide means, 101-incoupling element, 102-optical waveguide element, 103-outcoupling element;
200-optical waveguide near-to-eye display device, 201-display engine, 21-display screen, 22-image former, 23-lens, 203-optical waveguide element, 202-inclined plane, 204-diffractive optical element;
300-optical waveguide near-to-eye display device, 301-display engine, 31-display screen, 32-image former, 33-lens, 303-optical waveguide element, 302-bevel, 304-diffractive optical element.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
It should be further noted that the drawings provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and only the relevant components of the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation.
As shown in fig. 1, the diffractive optical waveguide apparatus 100 includes a coupling-in element 101, an optical waveguide element 102, and a coupling-out element 103. The incoupling element 101 is used for receiving light beams associated with an input image, the outcoupling element 103 is a light beam output end, and the optical waveguide element 102 is arranged on an optical path between the incoupling element 101 and the outcoupling element 102 and is used for transmitting the light beams received by the incoupling element 101 to the outcoupling element 102 and outputting the light beams. In fig. 1, the coupling-in element 101 is disposed inside the left end of the optical waveguide element 102, and the coupling-out element 103 is disposed inside the right end of the optical waveguide element 102. The light beam is coupled into the optical waveguide device 102 through the left coupling-in device 101, and the light beam is transmitted in the optical waveguide device 102 to the right coupling-out device 103. In the process of light beam coupling, because only 1 st-order diffracted light is used, most of energy of other light is lost, so that the overall light energy utilization rate is low, and the display brightness of the diffracted light waveguide device 100 is low.
The utility model discloses a solve the problem that traditional diffraction optical waveguide light energy utilization rate that exists is low, demonstration luminance is not enough among the prior art, provide a near-to-eye display device of optical waveguide.
Fig. 2 is a schematic structural diagram of an optical waveguide near-eye display device 200 according to an embodiment of the present invention. The optical waveguide near-eye display device 200 includes a display engine 201, an optical waveguide element 203, and a diffractive optical element 204. The display engine 201 is configured to emit signal light of a virtual image, the optical waveguide element 203 is provided with an inclined plane 202, the inclined plane 202 is configured to receive the signal light from the display engine 201 and couple the signal light into the optical waveguide element 203 in a refractive manner, the signal light further propagates in the optical waveguide element 203 until reaching the diffractive optical element 204, and the diffractive optical element 204 is configured to couple out the signal light propagating through the optical waveguide element 203, so that a human eye can receive the virtual image from an output side of the diffractive optical element 204.
In one embodiment, the optical waveguide element 203 is provided with two side surfaces parallel to each other, the signal light is totally reflected on the two side surfaces in the optical waveguide element 203, the whole signal light propagates in a direction parallel to the side surfaces until reaching the diffractive optical element 204, the diffractive optical element 204 is provided on one side surface of the optical waveguide element 203, the inclined surface 202 of the optical waveguide element 203 is a light beam incident surface of the optical waveguide element 203, and an included angle α between the incident surface and the propagation direction of the signal light in the optical waveguide element 203 can be acute angle or obtuse angle, that is, the inclined surface 202 can be set such that the signal light of the display engine 201 can be refracted and coupled in from the same side as the diffractive optical element 204 or from a side different from the diffractive optical element 204.
Specifically, in one embodiment, the display engine 201 emits a signal light of a virtual image with a certain angle of view, such as the light beam 24 shown in fig. 2, the angle α of the inclined surface 202 of the optical waveguide element 203 with respect to the propagation direction of the signal light is determined by the angle of view of the signal light incident to the inclined surface 202. by knowing the angle of view of the light beam 24, the angle α of the inclined surface 202 of the optical waveguide element 203 can be determined, the inclined surface 202 makes the beam angle of the light beam 24 coupled into the optical waveguide element 203 greater than or equal to the beam angle at which the light beam 24 can be totally reflected in the optical waveguide element 203, so that light within the range of the angle of view of the signal light can be coupled in through the inclined surface 202 of the optical waveguide element 203 and totally reflected in the optical waveguide element 203, the light beam 24, after being incident from the inclined surface 202 of the optical waveguide element 203, propagates to the diffractive optical element 204 by total reflection in the optical waveguide element 203, the light beam 24 is coupled out into the optical waveguide element 203 by refraction through the inclined surface 202, the arrangement of the optical waveguide element 203 is cancelled, the grating is improved, and the energy loss of the signal light can be further reduced.
In an embodiment, the inclined plane 202 of the optical waveguide element 203 may be further coated with an antireflection film (not shown) for reducing stray light of the optical waveguide near-eye display device 200, further reducing energy loss of the signal light on the inclined plane 202, and improving energy utilization rate of the signal light.
In one embodiment, the display engine 201 may include a display screen 21 and an image former 22. The display screen 21 is used for forming images, and the image former 22 is arranged on the light-emitting side of the display screen 21, which can be implemented using a transmission projection technique or a reflection technique to emit a virtual display image outward.
The display panel 21 may include a light emitting diode (L ED), an organic light emitting diode (O L ED), a plasma cell, a capacitive display element, an electrowetting display element, a liquid crystal display element (L CD), or other suitable display pixels formed by a display pixel structure, which is not particularly limited.
With continued reference to fig. 2, in an embodiment, the display engine 201 may further include a lens 23, where the lens 23 is disposed on the light-emitting side of the image former 22, and is configured to receive the virtual display image from the image former 22 and collimate, diverge or converge the signal light of the virtual display image, so that the signal light is incident on the inclined surface 202 of the optical waveguide element 203 in a collimated, divergent or convergent manner.
In one embodiment, the display engine 201 may also include an illuminator (not shown) for providing backlight, for example, the illuminator may include red L ED, green L ED, and blue L ED to generate red, green, and blue components of an image, respectively.
In one embodiment, the diffractive optical element 204 may be a diffraction grating having a grating period of a certain period, such as a plane grating, a blazed grating, or a volume hologram grating, for separating and redirecting the signal light from the optical waveguide element 202. The separation (referred to as the optical diffraction order) and the angle change of the signal light depend on the characteristics of the diffractive optical element 204. The size of the diffractive optical element 204 may be determined according to the exit pupil size and characteristics of the optical waveguide near-eye display device 200, and is not limited herein.
The diffractive optical element 204 may be at least partially embedded in the optical waveguide element 203, or may be provided on the outer surface of the optical waveguide element 203. While the display engine 201 and the diffractive optical element 204 are shown in fig. 2 as being located at different ends of the optical waveguide element 203, in other embodiments of the present invention, the display engine 201 and the diffractive optical element 204 may also be located at the same end of the optical waveguide element 203, i.e., only the output light of the optical waveguide near-to-eye display device 200 needs to be directed toward the eyes of the viewer. The present invention does not specifically limit the specific positions of the display engine 201 and the diffractive optical element 204 in the optical waveguide near-eye display device 200, nor the angle of the emergent light of the optical waveguide near-eye display device 200.
It should be noted that the optical waveguide element 203 may include one or more waveguide layers. The present invention is described with reference to only one waveguide layer, and in alternative embodiments, the optical waveguide device 203 may include two, three or four waveguide layers, but is not limited thereto.
Fig. 3 is a schematic structural diagram of another optical waveguide near-eye display device 300 according to an embodiment of the present invention. The optical waveguide near-eye display device 300 includes a display engine 301, an optical waveguide element 303, and a diffractive optical element 304. The display engine 301 is configured to emit signal light of a virtual image, and the optical waveguide element 303 is provided with an inclined plane 302, where the inclined plane 302 may form a reflection surface by way of plating a reflection film, and is configured to reflect incident signal light. The optical waveguide element 303 is further provided with an incident surface connected to the inclined surface 302, the signal light of the display engine 301 is coupled into the optical waveguide element 303 through the incident surface and then reflected by the inclined surface 302, the signal light further propagates in the optical waveguide element 303 until reaching the diffractive optical element 304, and the diffractive optical element 304 is configured to couple out the signal light propagating through the optical waveguide element 303.
In one embodiment, the optical waveguide element 303 also has two side surfaces parallel to each other, and in the optical waveguide element 303, the signal light is totally reflected on the two side surfaces, and the signal light entirely propagates in a direction parallel to the side surfaces until reaching the diffractive optical element 304. The diffractive optical element 304 is provided on one surface of the optical waveguide element 303. The light incident surface of the optical waveguide element 303 may be at least a part of any one side surface. An included angle θ between the inclined surface 302 of the optical waveguide element 303 and the light incident surface of the optical waveguide element 303 is an acute angle.
In one embodiment, the display engine 301 emits virtual image signal light at a field angle, such as the light beam 30 shown in FIG. 3. With a known angle of view of the light beam 30, the angle θ of the inclined surface 302 of the optical waveguide element 303 with respect to the propagation direction of the signal light can be determined. The included angle θ is set such that the beam angle of the light beam 30 reflected by the inclined surface 302 is greater than or equal to the beam angle at which the light beam can be totally reflected in the optical waveguide element 303, so that the light beams within the field angle range of the signal light can be coupled in through the inclined surface 302 of the optical waveguide element 303 and totally reflected in the optical waveguide element 303. After the light beam 30 enters the optical waveguide element 303, the light beam is reflected by the inclined surface 302 of the optical waveguide element 303, propagates to the diffractive optical element 304 by total reflection in the optical waveguide element 303, and the light beam 30 is coupled out by the diffractive optical element 304. The light beam 30 directly enters the optical waveguide element 303, the arrangement of the coupling-in grating is cancelled, the total reflection is carried out on the optical waveguide element 303 through the reflection of the inclined plane 302, the coupling-in efficiency of the signal light at the inclined plane 302 is improved, the energy loss of the signal light only occurs in the processes of reflection and absorption in the optical waveguide element 303, and therefore the energy loss of the signal light can be further reduced.
In one embodiment, the display engine 301 may include a display screen 31, an image former 32, and a lens 33. The display engine 301 may refer to the settings of the display engine 201 in the above embodiments, and the details are not repeated here.
In one embodiment, the diffractive optical element 304 can refer to the arrangement of the diffractive optical element 204 in the above embodiments, which are not described herein.
The embodiment of the present invention further provides an electronic device (not shown), which includes the optical waveguide near-eye display device 200 or the optical waveguide near-eye display device 300 according to the foregoing embodiment.
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.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An optical waveguide near-eye display device, comprising:
a display engine for emitting signal light of a virtual display image;
an optical waveguide element for propagating the signal light; and
a diffractive optical element for coupling out the signal light propagating through the optical waveguide element;
wherein the optical waveguide element has a slope; the inclined plane refractively couples the signal light into the optical waveguide element; or the inclined surface is used to reflect the signal light entering the optical waveguide element.
2. The optical waveguide near-eye display device according to claim 1, wherein the inclined surface is an incident surface of the optical waveguide element, and the signal light is refractively coupled into the optical waveguide by the incident surface; and an included angle between the incident surface and the propagation direction of the signal light in the optical waveguide element is an acute angle or an obtuse angle.
3. The optical waveguide near-eye display device of claim 2, wherein an antireflection film is provided on the incident surface for reducing stray light.
4. The optical waveguide near-eye display device of claim 1, wherein the display engine comprises:
a display screen for displaying an image;
the image former is used for emitting a virtual display image outwards by using a transmission projection technology or a reflection technology; and
a lens to receive the virtual display image that diverges from the image former to collimate, transmit, or converge the virtual display image and to transmit the signal light toward the optical waveguide element.
5. The optical waveguide near-eye display device of claim 1, wherein the diffractive optical element is embedded in the optical waveguide element or disposed on an outer surface of the optical waveguide element.
6. The optical waveguide near-to-eye display device of claim 1, wherein the inclined plane is a reflection plane of the optical waveguide element, the optical waveguide element further has an incident plane connected to the reflection plane at an acute angle, and the signal light is coupled into the optical waveguide through the incident plane and reflected by the reflection plane.
7. The optical waveguide near-eye display device of claim 6, wherein the reflective surface is coated with a reflective film for reflecting the incident signal light.
8. The optical waveguide near-eye display device according to any one of claims 1 to 7, wherein an angle between the inclined surface and a propagation direction of the signal light in the optical waveguide element is set so that a beam angle after the signal light is reflected or refracted is greater than or equal to a beam angle at which the signal light can be totally reflected in the optical waveguide.
9. An electronic device comprising the optical waveguide near-eye display apparatus of any one of claims 1 to 8.
10. The electronic device of claim 9, wherein the electronic device is a wearable display device.
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| CN201922303745.6U CN211086808U (en) | 2019-12-18 | 2019-12-18 | Optical waveguide near-to-eye display device and electronic equipment |
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| CN201922303745.6U CN211086808U (en) | 2019-12-18 | 2019-12-18 | Optical waveguide near-to-eye display device and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965826A (en) * | 2020-08-27 | 2020-11-20 | Oppo广东移动通信有限公司 | Control method and device of intelligent glasses, storage medium and intelligent glasses |
| WO2023071474A1 (en) * | 2021-10-27 | 2023-05-04 | 上海鲲游科技有限公司 | Optical waveguide device and manufacturing method therefor |
-
2019
- 2019-12-18 CN CN201922303745.6U patent/CN211086808U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965826A (en) * | 2020-08-27 | 2020-11-20 | Oppo广东移动通信有限公司 | Control method and device of intelligent glasses, storage medium and intelligent glasses |
| WO2023071474A1 (en) * | 2021-10-27 | 2023-05-04 | 上海鲲游科技有限公司 | Optical waveguide device and manufacturing method therefor |
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