CN111479103A - Near-to-eye light field display system and method and electronic equipment - Google Patents
Near-to-eye light field display system and method and electronic equipment Download PDFInfo
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- CN111479103A CN111479103A CN202010276847.8A CN202010276847A CN111479103A CN 111479103 A CN111479103 A CN 111479103A CN 202010276847 A CN202010276847 A CN 202010276847A CN 111479103 A CN111479103 A CN 111479103A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/366—Image reproducers using viewer tracking
- H04N13/383—Image reproducers using viewer tracking for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/398—Synchronisation thereof; Control thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a near-eye light field display system, a near-eye light field display method and electronic equipment, wherein the system comprises an image emitter, an eye movement tracker, a controller and a diffraction optical device; the image emitter is connected with the controller and used for generating viewpoint images and emitting at least two viewpoint images to the diffraction optical device according to the angle indicated by the control signal of the controller; the eye movement tracker is connected with the controller and used for monitoring the movement of human eyes in real time, acquiring real-time human eye position information and sending the real-time human eye position information to the controller; the controller generates a corresponding control signal according to the position information of human eyes and sends the control signal to the image emitter so as to adjust the projection angle of the viewpoint image; the diffraction optical device receives the image light of at least two viewpoint images and converges the image light to different positions of human eyes, so that the human eyes can watch the at least two viewpoint images simultaneously. The invention enables human eyes to see a plurality of viewpoint images at the same point at the same time, generates monocular depth clues, accords with the mode that the human eyes watch the real world, and effectively solves the problem of convergence conflict of vision.
Description
Technical Field
The invention relates to the technical field of consumer electronics, in particular to a near-eye light field display system and method and electronic equipment.
Background
In the existing near-to-eye display system, only a plane image can be displayed for a viewer, and then a parallax image pair is provided for the viewer according to the left and right display modules, so that stereoscopic impression is generated. There are two problems with these display technologies: the first is the contradiction problem of the visual convergence adjustment, namely, people perceive the 3D effect generated by forming different parallax images on the left eye and the right eye of human eyes, when people watch the 3D image, because the parameters of the optical elements of the traditional AR equipment are fixed, the convergence depth generated by the movement of the human eyes can change along with the spatial position of a 3D object, the convergence of the human eyes and the focusing adjustment process are conflicted, and the visual fatigue is easily caused; the second is lack of sufficient motion parallax, which causes the 3D image seen by the viewer to be constant or discontinuous in change during the movement process, thereby affecting the viewing experience.
Disclosure of Invention
The present invention is directed to a near-eye light field display system, a near-eye light field display method, and an electronic device, which solve at least one of the problems of the prior art.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
a near-eye light field display system comprising an image emitter, an eye tracker, a controller, and a diffractive optic, wherein: the image emitter is connected with the controller and used for generating viewpoint images consisting of image light and emitting at least two viewpoint images to the diffraction optical device according to the angle indicated by the control signal of the controller; the eye movement tracker is connected with the controller and used for monitoring the movement of human eyes in real time so as to acquire real-time human eye position information and sending the human eye position information to the controller; the controller is used for generating corresponding control signals according to the human eye position information and sending the control signals to the image emitter so as to adjust the projection angle of the viewpoint image; the diffraction optical device is used for receiving the image light of the at least two viewpoint images and converging the image light to different positions of human eyes, so that the human eyes can watch the at least two viewpoint images simultaneously.
In some embodiments, the human eye position information includes a gaze point position and gaze depth information of the human eye.
In some embodiments, the image emitter comprises an illumination element, an image forming element, and a lens, wherein: the image forming element is backlit by the illuminating element and generates a viewpoint image by using transmission projection or reflection; the lens is disposed at a front end of the image forming element, and receives the viewpoint image from the image forming element to collimate and condense image light for displaying the viewpoint image.
In some embodiments, the illumination elements further include red L ED, green L ED, and blue L ED to form red, green, and blue components of the viewpoint image, respectively.
In some embodiments, the lens comprises one or a combination of two or more of a spherical lens, an aspherical lens, and a fresnel lens.
In some embodiments, the eye tracker comprises an infrared emitting module, an infrared receiving module, and a processing module, wherein: the infrared emission module emits infrared beams to human eyes; the infrared receiving module receives the infrared light beams reflected by the iris of the human eye and feeds the infrared light beams back to the processing module; the processing module processes the infrared light beams reflected by the iris of the human eye to obtain the fixation point position and the fixation depth information of the human eye, and feeds the obtained fixation point position and the fixation depth information of the human eye back to the controller.
In some embodiments, the diffractive optic is a holographic film configured to receive and reflect image light of the at least two viewpoint images emitted by the image emitter to the human eye.
In some embodiments, the holographic film comprises a plurality of different holograms, each hologram recording image light of a different diffraction angle, wherein the image light of different diffraction angles may intersect different gaze point locations of the human eye.
The invention further provides a near-eye light field display method, which is applied to the near-eye light field display system and comprises the following steps: s1, generating and projecting at least two viewpoint images to the diffractive optic through the image emitter, wherein an angle at which the viewpoint images are projected to the diffractive optic is indicated by a control signal of the controller; s2, diffracting the image light of the at least two viewpoint images through a diffraction optical device and converging the image light to different positions of human eyes to form viewpoint images; s3, acquiring real-time fixation point position and fixation depth information of human eyes through an eye movement tracker, and feeding back the real-time fixation point position and fixation depth information to a controller; and S4, receiving the real-time gazing point position and gazing depth information of human eyes through the controller, generating corresponding control signals and sending the control signals to the image emitter so as to adjust the projection angle of the viewpoint image.
The invention further provides an electronic device comprising the near-eye light field display system.
The technical scheme of the invention has the beneficial effects that: according to the invention, the position information of the human eyes is monitored by the eye tracker and then fed back to the controller, the controller generates a corresponding control signal for adjusting the angle of the viewpoint image projected by the image emitter according to the position information, and sends the control signal to the image emitter in a time sequence manner, so that the image emitter projects a plurality of viewpoint images with the same point and different angles to the diffractive optical device in a time sequence manner, and the diffractive optical device diffracts light rays to different positions of the human eyes.
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, and 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 creative efforts.
FIG. 1 is a schematic diagram of the optical path of a human eye viewing a real object;
FIG. 2 is a schematic structural diagram of a near-eye light field display system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a near-to-eye light field display system after being changed based on human eye position information according to an embodiment of the present invention;
FIG. 4 is a block diagram of an image emitter in a near-eye light field display system in accordance with one embodiment of the present invention;
FIG. 5 is a block diagram of an eye tracker in a near-eye light field display system according to an embodiment of the present invention;
fig. 6 is a flowchart of a near-eye light field display method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the embodiments of the present invention more comprehensible to those skilled in the art, the technical solution of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be further understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner" and "outer" and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, 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 diagram of an optical path structure when a real object is viewed by human eyes. As shown in fig. 1, a point (for example, point a) on an object may emit a plurality of light rays, and the light rays emitted from different points may intersect at human eyes and converge into a viewpoint to form a viewpoint image, so that the human eyes may view a plurality of side information of the object at the same time. Based on the principle, the invention provides a near-eye light field display system, which realizes that at least two viewpoint images enter human eyes to generate monocular depth clues and accords with the way that the human eyes watch the real world.
Fig. 2 is a schematic structural diagram of a near-eye light field display system 200 according to an embodiment of the present invention. As shown in fig. 2, the system 200 includes an image emitter 201, an eye tracker 202, a controller 203, and a diffractive optic 204. The image transmitter 201 is connected with the controller 203, and the connection is mainly used for transmitting signals; there is a connection between the controller 203 and the eye tracker 202, and as such, this connection is primarily used for transmitting signals. The image emitter 201 can generate a viewpoint image, the viewpoint image is composed of image light, the generated image light of the viewpoint image is projected onto the diffractive optical device 204, and then is collimated and converged to human eyes by the diffractive optical device 204, so that the viewpoint image is generated in the human eyes. The image emitter 201 projects the viewpoint images according to an angle indicated by a control signal of the controller, and sequentially projects at least two viewpoint images. The eye tracker 202 may monitor the movement information of the position of the human eye 205 in real time, such as acquiring the real-time gaze point position and gaze depth information of the human eye, and transmit the acquired real-time human eye position information to the controller 203. The controller 203 receives the real-time eye position information transmitted by the eye tracker 202, generates a control signal with the eye position information based on the real-time eye position information, and then sends the control signal to the image transmitter 201, and the image transmitter 201 can adjust the projection angle of the viewpoint image according to the control signal.
As shown in fig. 4, in some embodiments, the image emitter 201 includes an illumination element 2011, an image forming element 2012, and a lens 2013. when implemented using transmissive projection technology, its light source is modulated by optically active material and the backlight is backlit with white light (which may be provided by the illumination element 2012), which is typically implemented using a liquid crystal display (L CD) type display with powerful backlight and high optical density. when implemented using reflective technology, its external light is reflected and modulated by optically active material. the illumination element 2012, in addition to illumination and the above-described function of providing backlight, may further include a red L ED, a green L ED, and a blue L ED to form red, green, and blue components of the viewpoint image, respectively.
As shown in fig. 5, in some embodiments, the eye tracker 202 includes an infrared transmitting module 2021, an infrared receiving module 2022, and a processing module 2023, according to the characteristic that the iris of the human eye has high reflection efficiency to the infrared beam, the infrared emission module 2021 emits the infrared beam in the safety range of the human eye to the human eye 205, the infrared receiving module 2022 receives the infrared beam reflected by the iris of the human eye 205 and feeds the infrared beam back to the processing module 2023, then based on the different shapes of the eyeball surfaces of the human eyeballs in different gazing directions, for different angles of the infrared light beam, therefore, different eyeball gazing directions correspond to different eyeball reflected light, the processing module 2023 analyzes the obtained information of the reflected light, and extracting the gaze point position and gaze depth information of the human eye according to the change of the reflection, and feeding back the acquired gaze point position and gaze depth information of the human eye to the controller 203.
In some embodiments, the diffractive optic is a holographic film configured to receive and reflect image light of the at least two viewpoint images emitted by the image emitter to the human eye. The holographic film includes a plurality of different holograms, each hologram recording image light of a different diffraction angle, wherein the image light of different diffraction angles may intersect different gaze point locations of a human eye. Further, the number of holograms of the holographic film may correspond to the total number of possible pupil positions of the viewer's human eye 205. It should be understood that the diffractive optic can also be at least one of a computer-produced hologram, a holographic optical element, or a diffractive optical element, without limitation herein.
In order to effectively adjust the deflection angle of the image light so that the image light passing through the diffractive optic 204 can be focused at different positions of the human eye 205, in one embodiment, the image emitter 201 emits the image light to the diffractive optic 204 at different angles, the diffractive optic 204 receives the image light and diffracts the image light toward the human eye of the viewer, and the image light diffracted by the diffractive optic 204 is focused at the human eye of the viewer to form a plurality of viewpoints, so that the viewer can view a plurality of viewpoint images at the same time. As shown in fig. 3, after the position of the human eye is changed (the dotted line indicates the changed position), the eye tracker 202 transmits an infrared beam outwards and receives the infrared beam reflected by the human eye, processes the fed-back infrared beam through its processing module to obtain the changed gaze point position and gaze depth information of the human eye 205, and transmits the changed gaze point position information of the human eye to the controller 203, the controller 203 generates and transmits a control signal to the image transmitter 201 based on the gaze point position and gaze depth information after the change of the position of the human eye to control the image transmitter 201 to change the projection angle of the image light, the image transmitter 201 receives the control signal of the controller 203 and sequentially projects a plurality of viewpoint images onto the diffractive optical device 204, the diffractive optical device 204 diffracts the image light received from the image transmitter 201 and converges the image light to the moved position of the human eye 205 to form a new viewpoint image, so that the viewer can view the correct image at any position.
An embodiment of the present invention further provides a method for generating a near-eye light field display of monocular visual depth cues by using the near-eye light field display system 200, where fig. 6 is a flowchart of the method, and the method includes the following steps:
s1, generating and transmitting at least two viewpoint images to the diffractive optic through the image transmitter, wherein an angle at which the viewpoint images are projected to the diffractive optic is indicated by a control signal of the controller;
s2, diffracting the image light of the at least two viewpoint images through a diffraction optical device and converging the image light to different positions of human eyes to form viewpoint images;
s3, acquiring real-time fixation point position and fixation depth information of human eyes through an eye movement tracker, and feeding back the real-time fixation point position and fixation depth information to a controller;
and S4, receiving the real-time gazing point position and gazing depth information of human eyes through the controller, generating corresponding control signals and sending the control signals to the image emitter so as to adjust the projection angle of the viewpoint image.
Specifically, in an actual situation, the eye position is always easy to change, the eye tracker can track the eye position in real time through the infrared light beam, so as to obtain the eye position information in real time, and can send information of each time of eye position update to the controller, the controller always generates a corresponding control signal according to the received eye gazing point position and gazing depth information, the time interval for generating the control signal can be according to a preset time sequence, for example, a corresponding control signal is generated according to the latest eye position information currently received every second, and the control signal is sent to the image transmitter according to the time sequence, the image transmitter transmits viewpoint images of the same point at different angles in time sequence, and the specific angle is adjusted by the control signal of the corresponding time sequence. Thus, a correctly positioned viewpoint image can be received regardless of changes in the positions of human eyes. Meanwhile, due to the persistence effect of human eyes, the human eyes can simultaneously see the viewpoint images corresponding to a plurality of continuous time sequences, the mode that the human eyes watch the real world is met, and the problem of convergence conflict of vision is effectively solved.
In addition, the embodiment of the invention also provides electronic equipment comprising the near-eye light field display system. 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.
In summary, according to the near-eye light field display system and the near-eye light field display method, after the eye tracker monitors the real-time position of the human eye, the controller sends the control signal to the image emitter, the image emitter sequentially projects a plurality of viewpoint images at the same point and different angles onto the diffractive optical device, and the diffractive optical device diffracts light to different positions of the human eye.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A near-eye light field display system comprising an image emitter, an eye tracker, a controller, and a diffractive optic, wherein:
the image emitter is connected with the controller and used for generating viewpoint images consisting of image light and emitting at least two viewpoint images to the diffraction optical device according to the angle indicated by the control signal of the controller;
the eye movement tracker is connected with the controller and used for monitoring the movement of human eyes in real time so as to acquire real-time human eye position information and sending the human eye position information to the controller;
the controller is used for generating corresponding control signals according to the human eye position information and sending the control signals to the image emitter so as to adjust the projection angle of the viewpoint image;
the diffraction optical device is used for receiving the image light of the at least two viewpoint images and converging the image light to different positions of human eyes, so that the human eyes can watch the at least two viewpoint images simultaneously.
2. The near-eye light field display system of claim 1 wherein the eye position information comprises a gaze point position and gaze depth information of the eye.
3. The near-eye light field display system of claim 1 wherein the image emitter comprises an illumination element, an image forming element, and a lens, wherein:
the image forming element is backlit by the illuminating element and generates a viewpoint image by using transmission projection or reflection;
the lens is disposed at a front end of the image forming element, and receives the viewpoint image from the image forming element to collimate and condense image light for displaying the viewpoint image.
4. The near-eye light field display system of claim 3 wherein the illumination elements further comprise red L ED, green L ED, and blue L ED to form red, green, and blue components of the viewpoint image, respectively.
5. The near-eye light field display system of claim 3, wherein the lens comprises one or a combination of two or more of a spherical lens, an aspherical lens, and a Fresnel lens.
6. The near-eye light field display system of claim 2 wherein the eye tracker comprises an infrared emitting module, an infrared receiving module, and a processing module, wherein:
the infrared emission module emits infrared beams to human eyes;
the infrared receiving module receives the infrared light beams reflected by the iris of the human eye and feeds the infrared light beams back to the processing module;
the processing module processes the light beam reflected by the iris of the human eye to obtain the gazing point position and the gazing depth information of the human eye and feeds the obtained gazing point position and the gazing depth information of the human eye back to the controller.
7. The near-eye light field display system of claim 1, wherein the diffractive optic is a holographic film configured to receive and reflect image light of the at least two viewpoint images emitted by the image emitter to the human eye.
8. The near-eye light field display system of claim 7, wherein the holographic film comprises a plurality of different holograms, each hologram recording image light at a different diffraction angle; wherein, the image lights with different diffraction angles can intersect with different fixation point positions of human eyes.
9. A near-eye light field display method applied to the near-eye light field display system according to any one of claims 1 to 8, comprising the steps of:
s1, generating and projecting at least two viewpoint images to the diffractive optic through the image emitter, wherein an angle at which the viewpoint images are projected to the diffractive optic is indicated by a control signal of the controller;
s2, diffracting the image light of the at least two viewpoint images through the diffraction optical device and converging the image light to different positions of human eyes to form viewpoint images;
s3, acquiring real-time fixation point position and fixation depth information of human eyes through an eye movement tracker, and feeding back the real-time fixation point position and fixation depth information to the controller;
and S4, receiving the real-time gazing point position and gazing depth information of human eyes through the controller, generating corresponding control signals and sending the control signals to the image emitter so as to adjust the projection angle of the viewpoint image.
10. An electronic device comprising the near-to-eye light field display system of any one of claims 1-8.
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