CN107884934B - Head-mounted display device and control method thereof - Google Patents
Head-mounted display device and control method thereof Download PDFInfo
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- CN107884934B CN107884934B CN201711104322.0A CN201711104322A CN107884934B CN 107884934 B CN107884934 B CN 107884934B CN 201711104322 A CN201711104322 A CN 201711104322A CN 107884934 B CN107884934 B CN 107884934B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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Abstract
The embodiment of the invention discloses a head-mounted display device and a control method thereof, wherein the head-mounted display device comprises: the display device comprises a display element and a control unit, wherein the display element displays a first image and a second image in a time sharing manner, the first image is a left eye observation image of a person, the second image is a right eye observation image of the person, and the first image and the second image respectively cover a display area of the display element; and the light path adjusting element is used for reflecting the first light rays emitted by the display element to enable the first light rays to emit to human eyes, and transmitting natural light rays in the surrounding environment to enable the first light rays to emit to the human eyes. The head-mounted display equipment can increase the size of the virtual image viewed by the left eye and the right eye of a person, so that the field angle of the virtual image viewed by the eyes of the person is increased, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of virtual display, in particular to a head-mounted display device and a control method thereof.
Background
With the development of display technologies, more and more augmented reality head-mounted display devices are applied to people's daily life. The existing augmented reality head-mounted display equipment mainly divides a display screen into two parts, respectively displays contents to be observed by left and right eyes, and then projects virtual objects on the display screen into human eyes based on a two-time plane reflection principle to realize a three-dimensional effect. However, the size of the virtual image formed by such a head-mounted display device is small, resulting in a virtual image with a field angle of not more than 30 ° observed by human eyes, and the user experience is poor.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a head-mounted display device and a control method thereof, so as to increase a field angle of a virtual image viewed by human eyes and improve user experience.
In order to solve the above problems, the embodiments of the present invention provide the following technical solutions:
a head-mounted display device, comprising:
the display device comprises a display element and a control unit, wherein the display element displays a first image and a second image in a time sharing manner, the first image is a left eye observation image of a person, the second image is a right eye observation image of the person, and the first image and the second image respectively cover a display area of the display element;
and the light path adjusting element is used for reflecting the first light rays emitted by the display element to enable the first light rays to emit to human eyes, and transmitting natural light rays in the surrounding environment to enable the first light rays to emit to the human eyes.
Optionally, the light path adjusting element includes a beam splitter and a reflecting prism, where the beam splitter is configured to receive the first light emitted by the display element and emit the first light to the reflecting prism;
the reflecting prism is used for reflecting the first light corresponding to the first image back to the light splitting plate, transmitting the first light to the left eye of a person through the light splitting plate, reflecting the first light corresponding to the second image back to the light splitting plate, and transmitting the first light to the right eye of the person through the light splitting plate.
Optionally, the reflecting prism is a free-form surface prism.
Optionally, an incident angle formed by the light rays emitted by the light splitting plate to the reflection prism on the outer surface of the reflection prism is larger than a total reflection angle, wherein the outer surface of the reflection prism is one of two surfaces of the reflection prism facing towards human eyes, the one surface being far away from the human eyes.
Optionally, a reflection increasing film is arranged on the side of the reflection prism, which faces away from human eyes.
Optionally, a virtual image formed by the light reflected by the outer surface of the reflecting prism is positioned in front of human eyes.
Optionally, the distance between the virtual image and the human eyes is in a range of 2 meters to 4 meters, inclusive.
Optionally, the optical path adjusting element further includes: and the compensating prism is positioned on one side of the reflecting prism, which is far away from the human eyes, and is used for correcting the image deformation formed by the natural light projected by the reflecting prism.
A method of controlling a head mounted display device, the head mounted display device comprising: the display device comprises a display element and a control unit, wherein the display element displays a first image and a second image in a time sharing manner, the first image is a left eye observation image of a person, the second image is a right eye observation image of the person, and the first image and the second image respectively cover a display area of the display element; the light path adjusting element is used for reflecting the first light rays emitted by the display element to enable the first light rays to emit to human eyes, and transmitting natural light rays in the surrounding environment to enable the first light rays to emit to the human eyes; the control method comprises the following steps:
in a first time period, controlling the display element to display a first image, controlling the light path adjusting element to emit light rays corresponding to the first image to the left eye of a person;
in a second time period, controlling the display element to display a second image, controlling the light path adjusting element to emit light rays corresponding to the second image to the right eye of the person;
wherein the first time period and the second time period are adjacent.
Optionally, the light path adjusting element includes a beam splitter and a reflecting prism, where the beam splitter is configured to receive the first light emitted by the display element and emit the first light to the reflecting prism; the reflecting prism is used for reflecting the first light rays corresponding to the first image to the light splitting plate, transmitting the first light rays to the left eye of a person through the light splitting plate, reflecting the first light rays corresponding to the second image to the light splitting plate, and transmitting the first light rays to the right eye of the person through the light splitting plate; the control method further comprises the following steps:
and adjusting the rotation angle of the light splitting plate and the surface shape of the inner surface of the reflecting prism so that the light rays emitted by the light splitting plate to the reflecting prism are totally reflected on the outer surface of the reflecting prism.
Compared with the prior art, the technical scheme has the following advantages:
in the technical solution provided in the embodiment of the present invention, the display element displays the first image and the second image in a time-sharing manner, and when the display element displays the first image and the second image respectively, the first image and the second image respectively cover the display area of the display element, so that the size of the virtual image viewed by the left eye and the right eye of a person is increased, the field angle of the virtual image viewed by human eyes is increased, the field angle of a single eye (left eye or right eye) is increased by more than one time, and the user experience 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 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 the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a head-mounted display device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an effective display area viewed by left and right eyes in a head-mounted display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a head-mounted display device according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a head-mounted display device according to another embodiment of the present invention;
fig. 5 is a flowchart of a method for controlling a head-mounted display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As described in the background section, the size of a virtual image formed by the conventional head-mounted display device is small, resulting in a virtual image with a field angle of not more than 30 ° observed by human eyes, and the user experience is poor.
In view of this, an embodiment of the present invention provides a head-mounted display device, as shown in fig. 1, the head-mounted display device including:
a display element 10, where the display element 10 time-divisionally displays a first image and a second image, where the first image is a left-eye observation image of a person, the second image is a right-eye observation image of a person, as shown in fig. 2, and the first image and the second image respectively fill up a display area of the display element 10, and in an embodiment of the present invention, the display area of the display element 10 is an effective display area of the display element, that is, an effective display area corresponding to each of left and right eyes;
and a light path adjusting member 20, wherein the light path adjusting member 20 is configured to reflect the first light emitted from the display element 10 to the human eye, and transmit natural light in the surrounding environment to the human eye.
Specifically, in the embodiment of the present invention, when the display element 10 displays a first image, the optical path adjusting element 20 reflects the first light emitted by the display element 10 to emit the first light to the left eye of the person, transmits natural light in the surrounding environment, and also emits the first light to the left eye of the person, so that an image composed of the first image and the surrounding environment is presented in the left eye of the person; when the display element 10 displays the second image, the optical path adjusting element 20 reflects the first light emitted from the display element 10 to emit to the right eye of the person, transmits natural light in the surrounding environment, and also emits to the right eye of the person, and the image composed of the second image and the surrounding environment is displayed in the right eye of the person.
As can be seen from the above, in the head-mounted display device provided in the embodiment of the present invention, the display element 10 displays the first image and the second image in a time-sharing manner, and when the display element 10 displays the first image and the second image respectively, the first image and the second image respectively cover the display area of the display element 10, so as to increase the size of the virtual image viewed by the left eye and the right eye of a person, further increase the field angle of the virtual image viewed by the human eye, increase the field angle of a single eye (left eye or right eye) by more than one time, and improve user experience.
On the basis of the above embodiments, in an embodiment of the present invention, as shown in fig. 3, the light path adjusting element includes a beam splitter 21 and a reflecting prism 22, wherein the beam splitter 21 is configured to receive the first light emitted from the display element 10 and direct the first light to the reflecting prism 22; the reflecting prism 22 is configured to reflect the first light corresponding to the first image back to the light-splitting plate 21, transmit the first light through the light-splitting plate 21 to the left eye of the person, reflect the first light corresponding to the second image back to the light-splitting plate 21, and transmit the first light through the light-splitting plate 21 to the right eye of the person, so as to implement directional display.
Specifically, in order to ensure that the first light corresponding to the first image emitted from the whole display area of the display element 10 can all enter the left eye of the user after being adjusted by the optical path adjusting element 20, and the first light corresponding to the second image emitted from the whole display area of the display element 10 can all enter the right eye of the user after being adjusted by the optical path adjusting element 20, so as to increase the observation field of view of the user, in an embodiment of the present invention, the reflective prism is a free-form surface prism.
On the basis of the above embodiments, in an embodiment of the present invention, the surface shape design method of the free-form surface prism may adopt a numerical optimization method or a partial differential equation solving method, which is not limited in the present invention and is determined as the case may be. Specifically, in an embodiment of the present invention, the design process of the free-form surface prism includes: firstly, setting free-form surface parameters of a double-taper surface, an asymmetric aspheric surface and the like of the free-form surface prism in optical design software; then setting optical variable parameters of the free-form surface prism, such as imaging circle radius (slightly smaller than the display size of the display element), optical path, entrance pupil diameter, gradual curvature, thickness and the like, and corresponding variable boundary conditions; and finally, carrying out iterative solution on the optical parameters in the system through a corresponding optimization algorithm to obtain the surface type of the free-form surface prism. It should be noted that, in the embodiment of the present invention, setting of each parameter in the surface type design process of the free-form surface prism is specifically determined according to an application scenario of the free-form surface prism, and the present invention is not limited to this, and is specifically determined according to a situation.
On the basis of any of the above embodiments, in an embodiment of the present invention, an incident angle formed on the outer surface of the reflection prism 22 by the light emitted from the light splitter 21 to the reflection prism 22 is larger than a total reflection angle, so that the light emitted from the light splitter 21 to the reflection prism 22 can be totally reflected on the outer surface of the reflection prism 22, the amount of light entering human eyes after being emitted from the light splitter 21 to the reflection prism 22 is increased, the light utilization rate of the first light emitted from the display element 10 is increased, and the display brightness of the display image viewed by human eyes is increased. Wherein, the outer surface of the reflection prism 22 is one surface far away from the human eye of the two surfaces of the reflection prism 22 facing the human eye.
In another embodiment of the present invention, a reflection increasing film (not shown) is disposed on a side of the reflection prism 22 away from the human eye to increase a reflectivity of the reflection prism 22 to the light emitted by the beam splitter 21, so as to improve a light utilization rate of the first light emitted by the display element 10 and improve a display brightness of a display image viewed by the human eye. However, the present invention is not limited thereto, as the case may be.
On the basis of any of the above embodiments, in one embodiment of the present invention, the light reflected by the outer surface of the reflecting prism 22 forms a virtual image in front of the human eye, so that the human eye can view the virtual image. Optionally, in an embodiment of the present invention, a distance between the virtual image and the human eyes is within a range of 2 meters to 4 meters, including end point values, so as to prevent the virtual image from being too close to the human eyes, causing pressure to the human eyes, causing discomfort to the human eyes, causing vertigo to the user, and simultaneously prevent the virtual image from being too far away from the human eyes, and reducing the definition of the image viewed by the human eyes. However, the present invention is not limited thereto, as the case may be.
It should be noted that, because the surface shape of the reflecting prism is designed mainly for the virtual image, it is difficult to satisfy both the virtual image and the real scene,
therefore, on the basis of any one of the above embodiments, in an embodiment of the present invention, in order to avoid distortion of a real scene formed by the ambient light passing through the reflecting prism, as shown in fig. 4, the optical path adjusting element further includes: and the compensating prism 23 is positioned on one side of the reflecting prism 22, which is far away from the human eyes, and the compensating prism 23 is used for correcting the image deformation formed by the natural light projected by the reflecting prism so as to avoid the deformation and the deviation of the image formed by the light of the surrounding environment penetrating through the reflecting prism.
Correspondingly, an embodiment of the present invention further provides a method for controlling a head-mounted display device, where the head-mounted display device includes: the display device comprises a display element and a control unit, wherein the display element displays a first image and a second image in a time sharing manner, the first image is a left eye observation image of a person, the second image is a right eye observation image of the person, and the first image and the second image respectively cover a display area of the display element; the light path adjusting element is used for emitting first light rays emitted by the display element to human eyes to form a virtual scene, transmitting natural light rays in the surrounding environment to enable the first light rays to emit to the human eyes to form a real scene, and the virtual scene and the real scene are overlapped to form an effect of augmented reality display. Specifically, in the embodiment of the present invention, as shown in fig. 5, the control method includes:
s1: in a first time period, controlling the display element to display a first image, controlling the light path adjusting element to emit light rays corresponding to the first image to the left eye of a person;
s2: in a second time period, controlling the display element to display a second image, controlling the light path adjusting element to emit light rays corresponding to the second image to the right eye of the person;
wherein the first time period and the second time period are adjacent.
On the basis of the above embodiment, in an embodiment of the present invention, the first time period is earlier than the second time period, that is, the display element displays the first image first and then displays the second image; in another embodiment of the invention, the first time period is later than the second time period, that is, the display element displays the second image first and then displays the first image, which is not limited in the invention, as the case may be.
On the basis of the above embodiments, in an embodiment of the present invention, the light path adjusting element includes a beam splitter and a reflecting prism, wherein the beam splitter is configured to receive the first light emitted by the display element and direct the first light to the reflecting prism; the reflecting prism is used for reflecting the first light corresponding to the first image back to the light splitting plate, transmitting the first light to the left eye of a person through the light splitting plate, reflecting the first light corresponding to the second image back to the light splitting plate, and transmitting the first light to the right eye of the person through the light splitting plate to realize directional display.
On the basis of the above embodiment, in an embodiment of the present invention, the control method further includes: the rotation angle of the light splitting plate and the surface shape of the inner surface of the reflecting prism are adjusted, so that the light of the light splitting plate, which is emitted to the reflecting prism, is totally reflected on the outer surface of the reflecting prism, the light quantity of the light, which is emitted to the reflecting prism by the light splitting plate and then enters the human eyes through the reflecting prism, is increased, the light utilization rate of the first light emitted by the display element is improved, and the display brightness of a display picture watched by the human eyes is improved. The inner surface of the reflecting prism is one of two surfaces of the reflecting prism, which face towards human eyes and are close to the human eyes; the outer surface of the reflecting prism is one surface far away from human eyes in two surfaces of the reflecting prism facing towards the human eyes.
In another embodiment of the present invention, a reflection increasing film is disposed on a side of the reflection prism away from the human eye to increase a reflectivity of the reflection prism to the light emitted by the light splitting plate, so as to improve a light utilization rate of the first light emitted by the display element and improve a display brightness of a display image viewed by the human eye. However, the present invention is not limited thereto, as the case may be.
On the basis of any one of the above embodiments, in an embodiment of the present invention, the virtual image formed by the light reflected by the outer surface of the reflecting prism is positioned in front of the human eye, so that the human eye can view the virtual image. Optionally, in an embodiment of the present invention, a distance between the virtual image and human eyes is within a range of 2 meters to 4 meters, including end point values, so as to prevent the virtual image from being too close to the human eyes, which causes a pressure feeling to the human eyes, which causes discomfort to the human eyes, which causes a user to generate symptoms such as vertigo, and simultaneously prevent the virtual image from being too far away from the human eyes, which reduces a definition of an image viewed by the human eyes. However, the present invention is not limited thereto, as the case may be.
It should be noted that, since the surface type of the reflection prism is mainly designed for a virtual image, and it is difficult to satisfy two conditions of the virtual image and a real scene at the same time, on the basis of any of the above embodiments, in an embodiment of the present invention, in order to prevent the real scene formed by the ambient light passing through the reflection prism from being deformed, the optical path adjusting element further includes: a compensation prism located on a side of the reflection prism facing away from the human eye, the control method further comprising: the compensation prism is used for correcting image deformation formed by projecting the natural light rays by the reflection prism so as to avoid deformation and deviation of images formed by transmitting the light rays of the surrounding environment through the reflection prism.
In the augmented reality head-mounted display device, the size and the display range of a virtual image formed by the head-mounted display device directly affect the subjective feeling of a user, so that the head-mounted display device and the control method thereof provided by the embodiment of the invention can effectively improve the utilization rate of a display area of a display element, double the effective view field of virtual image display, simultaneously keep the 3D display effect and improve the user experience.
In summary, in the head-mounted display device and the control method thereof provided by the embodiments of the present invention, the display element displays the first image and the second image in a time-sharing manner, and when the display element displays the first image and the second image respectively, the first image and the second image respectively fill up the display area of the display element, so as to increase the size of the virtual image viewed by the left eye and the right eye of the person, further increase the field angle of the virtual image viewed by the human eye, increase the field angle of a single eye (left eye or right eye) by more than one time, and improve user experience.
In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A head-mounted display device, comprising:
the display device comprises a display element and a control unit, wherein the display element displays a first image and a second image in a time sharing manner, the first image is a left eye observation image of a person, the second image is a right eye observation image of the person, and the first image and the second image respectively cover a display area of the display element;
the light path adjusting element reflects first light rays emitted by the display element to enable the first light rays to emit to the left eye of a person, transmits natural light rays in the surrounding environment and enables the natural light rays to emit to the left eye of the person when the display element displays a first image, and an image formed by the first image and the surrounding environment is displayed in the left eye of the person; when the display element displays a second image, the optical path adjusting element reflects the first light emitted by the display element to enable the first light to emit to the right eye of a person, transmits natural light in the surrounding environment and enables the first light to emit to the right eye of the person, and an image formed by the second image and the surrounding environment is displayed in the right eye of the person;
the light path adjusting element comprises a light splitting plate and a reflecting prism, wherein the light splitting plate is used for receiving a first light ray emitted by the display element and emitting the first light ray to the reflecting prism; the reflecting prism is used for reflecting the first light corresponding to the first image to the light splitting plate, transmitting the first light to the left eye of a person through the light splitting plate, reflecting the first light corresponding to the second image to the light splitting plate, and transmitting the first light to the right eye of the person through the light splitting plate, so that the oriented display of the virtual image is realized.
2. The head-mounted display device of claim 1, wherein the reflective prism is a freeform prism.
3. The head-mounted display device according to claim 2, wherein the light rays of the light splitting plate directed to the reflecting prism form an incident angle larger than a total reflection angle on an outer surface of the reflecting prism, wherein the outer surface of the reflecting prism is one of two surfaces of the reflecting prism facing the human eye, which is far away from the human eye.
4. A head-mounted display device as claimed in claim 2, characterized in that the side of the reflection prism facing away from the human eye is provided with a reflection increasing film.
5. The head-mounted display device of claim 1, wherein the distance between the virtual image and the human eye is in a range of 2 meters to 4 meters, inclusive.
6. The head-mounted display device of claim 1, wherein the optical path adjustment element further comprises: and the compensating prism is positioned on one side of the reflecting prism, which is far away from the human eyes, and is used for correcting the image deformation formed by the natural light projected by the reflecting prism.
7. A method for controlling a head-mounted display device, the head-mounted display device comprising: the display device comprises a display element and a control unit, wherein the display element displays a first image and a second image in a time sharing manner, the first image is a left eye observation image of a person, the second image is a right eye observation image of the person, and the first image and the second image respectively cover a display area of the display element; the light path adjusting element reflects first light rays emitted by the display element to enable the first light rays to emit to the left eye of a person, transmits natural light rays in the surrounding environment and enables the natural light rays to emit to the left eye of the person when the display element displays a first image, and an image formed by the first image and the surrounding environment is displayed in the left eye of the person; when the display element displays a second image, the optical path adjusting element reflects the first light emitted by the display element to enable the first light to emit to the right eye of a person, transmits natural light in the surrounding environment and enables the first light to emit to the right eye of the person, and an image formed by the second image and the surrounding environment is displayed in the right eye of the person; the light path adjusting element comprises a light splitting plate and a reflecting prism, wherein the light splitting plate is used for receiving a first light ray emitted by the display element and emitting the first light ray to the reflecting prism; the reflecting prism is used for reflecting the first light rays corresponding to the first image to the light splitting plate, transmitting the first light rays to the left eye of a person through the light splitting plate, reflecting the first light rays corresponding to the second image to the light splitting plate, and transmitting the first light rays to the right eye of the person through the light splitting plate to realize directional display; the control method comprises the following steps:
in a first time period, controlling the display element to display a first image, controlling the light path adjusting element to emit light rays corresponding to the first image to the left eye of a person;
in a second time period, controlling the display element to display a second image, controlling the light path adjusting element to emit light rays corresponding to the second image to the right eye of the person;
wherein the first time period and the second time period are adjacent.
8. The control method according to claim 7, characterized by further comprising:
and adjusting the rotation angle of the light splitting plate and the surface shape of the inner surface of the reflecting prism so that the light rays emitted by the light splitting plate to the reflecting prism are totally reflected on the outer surface of the reflecting prism.
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| CN111290127B (en) * | 2020-03-31 | 2022-11-15 | 优奈柯恩(北京)科技有限公司 | Head-mounted display device |
| CN111399223B (en) * | 2020-04-14 | 2022-04-12 | Oppo广东移动通信有限公司 | Lens assembly and head-mounted display device |
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