CN216561236U - Light field display system for myopia prevention and control - Google Patents
Light field display system for myopia prevention and control Download PDFInfo
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Abstract
The application provides a light field display system for myopia prevention and control, the light field display system for myopia prevention and control includes: a display assembly capable of producing an in-focus image that is imaged on a user's retina and an out-of-focus image that is imaged in front of the user's retina; the eye movement tracking device is used for tracking the eyeball movement of the user and calculating the distance from the eyes of the user to the display assembly to obtain the position of the fixation point of the user; and the control component is used for determining a first range and a second range according to the gaze point position detected by the eye tracking device, and enabling the images in the first range to form an in-focus image and the images in the second range to form an out-of-focus image. The utility model provides a light field display system for myopia is prevented accuse produces myopia out of focus image in the other central zone of retina yellow spot fovea side, is about to before light focuses on the retina, can produce the increase of control eye axis, effectively controls the deepening of user's myopia.
Description
Technical Field
The application relates to the field of display devices, in particular to a light field display system for myopia prevention and control.
Background
The existing research shows that a near-sighted out-of-focus image is generated in a side central area beside a fovea of a user retina, namely, light rays are focused in front of the user retina, so that the increase of the axis of the user's eye can be controlled, and the deepening of the user's myopia can be controlled. Further, in the range of 10-20 degrees from the pararetinal center, the myopic out-of-focus image is most effective in controlling the myopia progression.
Therefore, there is a need for a light field display system for myopia prevention control that can produce a sharp image at a user viewpoint and an image that is myopically out of focus at a side-center region near the user viewpoint.
In this background section, the above information disclosed is only for enhancement of understanding of the background of the application and therefore it may contain prior art information that does not constitute a part of the common general knowledge of a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a light field display system for myopia prevention and control, which can generate clear images at the viewpoint of a user and generate images with myopia and defocusing in a side-center area near the viewpoint of the user.
The application provides a light field display system for myopia prevention and control, which comprises a display assembly and a control module, wherein the display assembly can generate an in-focus image and an out-of-focus image, the in-focus image is imaged on the retina of a user, and the out-of-focus image is imaged in front of the retina of the user; the eye movement tracking device is used for tracking the eyeball movement of the user and calculating the distance from the eyes of the user to the display assembly to obtain the fixation point position of the user; and the control component is used for determining a first range and a second range according to the gaze point position detected by the eye tracking device, and enabling the images in the first range to form an in-focus image and the images in the second range to form an out-of-focus image.
According to some embodiments of the present application, the display assembly includes a first display device and a second display device, the first display device for generating an in-focus image; the second display device is used for generating an out-of-focus image.
According to some embodiments of the present application, the first display device comprises at least one transparent display device, and/or the second display device comprises a non-transparent display device.
According to some embodiments of the application, the first display device and the second display device are parallel to each other.
According to some embodiments of the present application, a refractive material, and/or a mechanical or electromechanical translation device is disposed between the second display device and the first display device.
According to some embodiments of the application, the first display device and the second display device are perpendicular to each other, and the synthesis of the in-focus image and the out-of-focus image is achieved by further including a half-reflecting and half-transmitting mirror in the display assembly.
According to some embodiments of the application, the transflective mirror is a curved transflective mirror.
According to some embodiments of the present application, the display assembly is a multi-layer liquid crystal display device, and the in-focus image and the out-of-focus image are located in different layers of the multi-layer liquid crystal display device.
According to some embodiments of the present application, the display assembly comprises a single display device and an optical path folding mirror group for providing a folded optical path.
According to some embodiments of the present application, the display assembly comprises a single display device and a microlens array forming an aerial image in a focal plane of at least two microlenses, the focal plane being located in front of or behind the single display device.
According to some embodiments of the application, the control component determines a first range and a second range by calculating an included angle value between a pixel near the point of regard and a user's line of sight, wherein the first range is a pixel area where the included angle value is not greater than 10 degrees, and the second range is a pixel area where the included angle value is greater than 10 degrees and not greater than 20 degrees.
According to some embodiments of the application, an image within the pixel region having the pinch angle value greater than 20 degrees is an out-of-focus image or an in-focus image.
According to some embodiments of the application, the optical path length of the first display device and/or the second display device to the user's eye is adjustable to produce different intensities of the myopic defocus effect: y is 1/(1/x + P); wherein P is the target defocus amount, y is the optical path from the second display device to the user's eye, and x is the optical path from the first display device to the user's eye.
According to the technical concept of the application, the light field display system for myopia prevention and control generates a myopia out-of-focus image in the side central area beside the fovea of the retina macula lutea, namely before light focuses on the retina, the increase of the axis of the eye can be generated, and the deepening of myopia of a user is effectively controlled.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an anti-myopia display system according to an exemplary embodiment of the present application.
FIG. 2 illustrates a schematic structural diagram of an anti-myopia display system according to some embodiments of the present application.
FIG. 3 shows a schematic diagram of an anti-myopia display system according to another embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The application provides a light field display system for myopia prevention and control, can produce clear image in user's viewpoint department, produces the image that myopia out of focus in the other central zone near user's viewpoint.
According to the technical concept of the application, the myopia prevention and control light field display system can obtain the fixation point position of the user by tracking the eyeball movement of the user and calculating the distance from the eyes of the user to the display device. According to the position of the user gazing point and the distance from the eyes to the display device, an included angle between a pixel near the gazing point on the display device and the sight line of the user is calculated, and the position of the pixel imaged on the retina can be obtained. And then the pixels of the image displayed by the display device within the range of 0-10 degrees from the user's gaze point are imaged on the focusing display layer of the display device, and the pixels within the range of 10-20 degrees from the user's gaze point are imaged on the defocusing display layer of the display device, so that the myopia defocusing image can be formed within the range of 10-20 degrees from the retina of the user. When the user's fixation point moves, the focusing area and the myopic defocus area also move correspondingly, so that the user can continuously obtain the near-focus defocus stimulus at the side center and can clearly see the image.
A light field display system for myopia prevention and control according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a light field display system for myopia prevention and control according to an exemplary embodiment of the present application.
Referring to fig. 1, the light field display system for myopia prevention and control of the exemplary embodiment includes a display assembly 1, an eye tracking device 2, and a control assembly 3.
As shown in fig. 1, the display assembly 1 is capable of producing an in-focus image that is imaged on the user's retina and an out-of-focus image that is imaged in front of the user's retina; the eye tracking device 2 is used for tracking the eyeball movement of the user, calculating the distance from the eyes of the user to the display component 1 and obtaining the fixation point position of the user; the control component 3 is used for determining a first range 31 and a second range 32 according to the fixation point position detected by the eye tracking device 2, and enabling the image in the first range 31 to form an in-focus image and the image in the second range 32 to form an out-of-focus image.
According to an exemplary embodiment, the display assembly 1 includes a first display device 11 and a second display device 12, the first display device 11 being used to generate an in-focus image, the second display device 12 being used to generate an out-of-focus image; the first display device 11 is disposed on a line-of-sight path from a user to the second display device 12, and the eye tracking device 2 is configured to calculate a distance from a line of sight of the user to the first display device 11 and the second display device 12, and obtain a gazing point position of the user. The second display device 12 is a conventional display device having a display function, such as a liquid crystal display device, a projector, a tablet computer, or a mobile phone.
The eye tracking device 2 is disposed on the first display device 11 and/or the second display device 12, the eye tracking device 2 is used for tracking the eyeball movement of the user, in some embodiments of the present application, the eye tracking device 2 is disposed on the first display device 11 alone or on the second display device 12 alone, in other embodiments of the present application, the eye tracking device 2 is composed of a plurality of device arrays, the plurality of device arrays are disposed on the first display device 11 and the second display device 12 respectively according to the tracking precision requirement, and when the light field display system of the present application further includes a mounting bracket, the eye tracking device 2 may be disposed on the mounting bracket. In embodiments of the present application, the particular physical set point of the eye tracking device 2 is not limited.
According to some embodiments of the present application, the control component 3 may confirm the light intensities of the display pixels of the first range 31 and the second range 32 on the first display device 11 and the second display device 12 according to a technology such as optical path tracking, and adjust the transmittance and the reflectance of the pixels to realize that the out-of-focus image and the in-focus image corresponding to different areas of the entrance pupil area are displayed with different light intensities, so that the gradual change of the first display device 11 and the second display device 12 is soft, the transition between the in-focus image and the out-of-focus image is natural, and the visual fatigue of the user during the viewing process is reduced.
According to some embodiments of the present application, the first display device 11 and the second display device 12 are arranged in parallel, and the first display device 11 and the second display device 12 arranged in parallel can reduce the influence of a visual error generated by a user in an observation process on an imaging effect, which results in an asymmetric transition effect of a focused image and an out-of-focus image, and reduce the effect of the light field display system of the present application on prevention and control of myopia.
In some embodiments of the present application, the display assembly 1 includes a multi-layer liquid crystal display device, the multi-layer liquid crystal display device has a plurality of liquid crystal display layers, the in-focus image and the out-of-focus image are located in different layers of the multi-layer liquid crystal display device, the layer of the multi-layer liquid crystal display device displaying the in-focus image is imaged on the retina of the user, the layer of the multi-layer liquid crystal display out-of-focus image is imaged in front of the retina of the user, the eye tracking device 2 is used for tracking the eye movement of the user, and calculating the distance from the eyes of the user to different layers of the plurality of liquid crystal display layers, so as to obtain the gaze point position of the user corresponding to the plurality of liquid crystal display layers. The control component 3 determines a first range 31 and a second range 32 according to the obtained gazing point positions of the user corresponding to the plurality of liquid crystal display layers, wherein the first range 31 corresponds to a layer of the plurality of liquid crystal display layers for displaying in-focus images, and the second range 32 corresponds to a layer of the plurality of liquid crystal display layers for displaying out-of-focus images.
The control component 3 can confirm the light intensity of the display pixels of the display devices of different layers in the multilayer liquid crystal display device according to the technologies such as light path tracking and the like, and adjust the transmissivity and the reflectivity of the pixels to realize that the defocused images and the focused images corresponding to different areas of the entrance pupil area are displayed with different light intensities, and the related optimization formula is as follows:
where I is the intensity of the light desired to display the image, and phi j ∈ Rp×lIs a point spread selection function containing light beam projection information of a corresponding display device j, and Φ j is a sparse matrix, j is 1, …, N, where N is the total number of the display devices, p represents the number of incident light rays, l represents the number of display pixels of the display devices, tj ∈ Rl × 1 contains light intensity information of each display pixel of the corresponding display device j, and tj > 0, k', k1, k2 … kN are coefficients preset based on the light intensity of the display pixels on the display devices and optical parameters of the optical system.
If the control unit 3 for adjusting the light intensity of the display pixels of the display devices of different layers in the multi-layer lcd device has a plurality of processors, and performs an optimization calculation to determine the light intensity, transmittance or reflectance at the display pixels of the lcd devices of each layer according to the desired display image, the related optimization formula is as follows:
where I is the intensity of the light desired to display the image, and phi j ∈ Rp×lIs a point spread selection function containing beam projection information for a corresponding display device j, and Φ j is a sparse matrix, j is 1, …, N, where N is the total number of the display devices, p represents the number of incident rays, l represents the number of display pixels of the display device, tj is the number of Rl×1Contains the light intensity information of each display pixel of the corresponding display device j, and tj is more than 0,
Φ′h∈Rp×qis a sparse matrix containing the light beam projection information of the corresponding spatial light modulator h in the reflection type light field modulation group, h is 0,1, …, i, i is the total number of the spatial light modulators in the reflection type light field modulation group, 0 & lt i & lt M, M is the total number of the one or more spatial light modulators, t' h belongs to Rq×1The transmissivity or reflectivity of each adjusting pixel containing the corresponding spatial light modulator h in the reflection type optical field modulation group, wherein q represents the number of the adjusting pixels of the spatial light modulator,
Φ″v∈Rp×qis a sparse matrix containing the beam projection information of the corresponding spatial light modulator v in said transmissive light field modulation set, v is 0,1, …, M-i is the total number of spatial light modulators in said transmissive light field modulation set, t "v e Rq×1The transmittance or reflectance of each adjustment pixel containing the corresponding spatial light modulator v in the transmissive light field modulation group.
The maximum resolution of a virtual image generated in a multi-layer liquid crystal display device is determined by a plurality of liquid crystal display devices, and the maximum resolution is determined by the plurality of liquid crystal display devices
Wherein dpi1、dpi2The resolutions of different liquid crystal display devices are respectively.
According to another embodiment of the present application, the display module 1 comprises a single display device and a lens assembly for providing a folded optical path (pancake optical path), wherein the lens assembly for providing a folded optical path has a polarization property capable of changing a displayed image, and based on such a property, the lens assembly for providing a folded optical path allows light to be selectively folded or not folded in the optical path, so as to selectively change the optical path, thereby enabling an image on a single display device to be imaged at different layers at the same time or at different times. Further, the layer in which the layer closest to the user can be regarded as the first display device 11 for generating an in-focus image, and the single display device can be regarded as the second display device 12 for generating an out-of-focus image.
According to another embodiment of the present application, the display assembly 1 includes a single display device and a microlens array, which is an array of lenses having a clear aperture and an embossed depth of the order of micrometers. It is the same as traditional lens, and minimum functional unit also can be in spherical mirror, aspherical mirror, cylinder lens, prism one or more, and microlens array can realize focusing, formation of image at little optical angle equally, functions such as light beam transform, and because the unit size is little, the integrated level is high for microlens array can constitute many neotype optical system, accomplishes the function that traditional optical element can't accomplish, in the embodiment of this application, microlens array forms the space image in the focal plane of at least two microlenses, and the focal plane is located single display device's preceding or back.
The control unit 3 determines the first range 31 and the second range 32 by calculating the value of the included angle between the pixels near the gazing point and the user's sight line, wherein the first range 31 is a pixel region having an included angle value of not more than 10 degrees, and the second range 32 is a pixel region having an included angle value of more than 10 degrees and not more than 20 degrees, according to the technical idea of the present application. According to the previous research, the near-sighted out-of-focus image is generated in the side-central area beside the fovea of the macula of the user, namely, the light is focused in front of the retina of the user, so that the increase of the axis of the eye of the user can be controlled, and the myopia of the user can be controlled. Further, the myopic out-of-focus image is most effective at controlling the progression of myopia in the range of 10-20 degrees from the user's periretinal center. The control component 3 displays the focusing image in the pixel area with the included angle value not greater than 10 degrees and displays the defocusing image in the pixel area with the included angle value greater than 10 degrees and not greater than 20 degrees by controlling the imaging effect of the display component 1, so that the myopia prevention and control of the user are realized. While according to the technical idea of the present application, for a pixel region with an included angle value greater than 20 degrees to display an out-of-focus image or an in-focus image, a specific imaging plane may be located on the first display device 11 and/or the second display device 12, the present application is not limited to a specific imaging plane of a pixel region with an included angle value greater than 20 degrees.
According to some embodiments, the rendering algorithm of the display module of the present application requires non-Negative Matrix Factorization (NMF) of a matrix, and according to the rendering algorithm, light field matrix factorization may be performed in a plurality of transparent display devices to form a matrix with a larger column rank (rank), so that an error of an imaging effect is small.
According to the technical concept of the present application, the optical paths of the first display device 11 and the second display device 12 to the eyes of the user are adjustable to generate different intensities of the myopic defocus effect:
y＝1/(1/x+P)；
where P is the target defocus amount, y is the optical path from the second display device 12 to the user's eye, and x is the optical path from the first display device 11 to the user's eye.
According to the technical idea of the present application, since the peripheral visual field region is not strongly sensitive to the light by the eyes, the peripheral visual field image corresponding to the visual field region outside the second range 32 can be directly provided for the eyes to watch. Therefore, the image of the peripheral field area may display one of the out-of-focus image or the in-focus image separately or simultaneously.
Since the eye has no light sensitivity to the virtual image in the blind spot visual field region, the transmittance and reflectance of the light intensity of the display pixels and the light intensity of the adjustment pixels may be arbitrary values for the display pixels and the adjustment pixels that participate in forming the virtual image in the blind spot visual field region. That is, in the display device that generates the out-of-focus image or the in-focus image in the blind spot view, the image displayed on the display device may be a random image or a black image.
FIG. 2 illustrates a schematic structural diagram of a light field display system for myopia prevention and control according to some embodiments of the present application.
Referring to fig. 2, the light field display system for myopia prevention and control of the exemplary embodiment includes a display assembly 1, an eye tracking device 2, and a control assembly 3.
The display assembly 1 is capable of producing an in-focus image which is imaged on the user's retina and an out-of-focus image which is imaged in front of the user's retina; the eye tracking device 2 is used for tracking the eyeball movement of the user, calculating the distance from the eyes of the user to the display component 1 and obtaining the fixation point position of the user; the control component 3 is used for determining a first range 31 and a second range 32 according to the fixation point position detected by the eye tracking device 2, and enabling the image in the first range 31 to form an in-focus image and the image in the second range 32 to form an out-of-focus image.
The display assembly 1 comprises first display means 11, second display means 12, refractive material and/or mechanical or electromechanical translation means 13. When the first display device 11 is a transparent display device and the second display device 12 is a non-transparent display device, the optical path between the first display device 11 and the second display device 12 relative to the eyes is adjustable, so as to generate the myopic defocus effect with different intensities:
y＝1/(1/x+P)；
where P is the target defocus amount, optionally-5 to-0.5D, preferably-4 to-2D, y is the optical path from the second display device 12 to the user's eye, and x is the optical path from the first display device 11 to the user's eye. The actual distance d' between the second display device 12 and the first display device 11 is (y-x)/n, n being the refractive index of the medium between the second display device 12 and the first display device 11.
According to some embodiments of the present application, the refractive material 13 is a transparent material with a high refractive index, and is disposed between the first display device 11 and the second display device 12 for increasing the optical distance between the first display device 11 and the second display device 12, and the refractive material 13 of the present application includes one or more of common high refractive index transparent materials such as organic glass, epoxy resin material, transparent coating material, and the like.
For example, assuming that the optical distance from the first display device 11 to the user's eye is 0.25m, and a defocus amount of-2D (diopter, 1/m) needs to be generated, the optical distance y from the second display device 12 to the user's eye is 1/(1/0.25+ (-2)) 1/(4-2) 1/2-0.5 m, the optical distance between the in-focus display device and the out-of-focus display device is 0.5-0.25 m, and if a refractive material with a refractive index of 1.5 and/or a mechanical or electromechanical translation device 13 is used to fill in between, the actual distance between the second display device 12 and the first display device 11 is 0.25/1.5-0.1667 m.
Fig. 3 shows a schematic structural diagram of a light field display system for myopia prevention and control according to another embodiment of the present application.
Referring to fig. 3, the light field display system for myopia prevention and control of the exemplary embodiment includes a display assembly 1, an eye tracking device 2, and a control assembly 3. The display assembly 1 is capable of producing an in-focus image which is imaged on the user's retina and an out-of-focus image which is imaged in front of the user's retina; the eye tracking device 2 is used for tracking the eyeball movement of the user, calculating the distance from the eyes of the user to the display component 1 and obtaining the fixation point position of the user; the control component 3 is used for determining a first range 31 and a second range 32 according to the fixation point position detected by the eye tracking device 2, and enabling the image in the first range 31 to form an in-focus image and the image in the second range 32 to form an out-of-focus image.
The display assembly 1 comprises a first display device 11, a second display device 12 and a transflective mirror 14. By means of the transflective mirror 14, the first display device 11 and the second display device 12 can be combined, wherein the image (or entity) of the second display device 12 is located at a further position as a second display layer, and the image (or entity) of the first display device 11 via the transflective mirror 14 is located at a closer position as a first display layer.
The half-reflecting and half-transmitting mirror 14 may be a plane or a curved surface, and is preferably a curved surface half-reflecting and half-transmitting mirror. When the curved semi-reflecting and semi-transmitting lens is used, the sizes of the first display device 11 and the second display device 12 can be set to be different, images can be enlarged through the reflection effect of the curved surface, or the images are far away, and a stronger retina myopia out-of-focus image is formed.
According to another embodiment of the present application, the first display device 11 and the second display device 12 are perpendicular to each other, and the synthesis of the in-focus image and the out-of-focus image is realized by the half mirror 14.
Before the transflective mirror, an optical element having a refractive or reflective function may be optically disposed, which may make the light reflected or transmitted from the transflective mirror enter the eye through refraction or reflection by the optical element. For example, the optical element may be one or more optical lenses, such as convex lenses, that focus light incident thereon. Further, the optical system in this embodiment may also be an optical waveguide.
The embodiments of the present application have been described and illustrated in detail above. It should be clearly understood that this application describes how to make and use particular examples, but the application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Through the description of the example embodiments, those skilled in the art will readily appreciate that the technical solutions according to the embodiments of the present application have at least one or more of the following advantages.
According to an exemplary embodiment of the application, the light field display system for myopia prevention and control can generate clear images at a user viewpoint and generate images out of focus in myopia at a side center area near the user viewpoint.
According to an exemplary embodiment of the application, the myopia prevention and control light field display system of the application can obtain the gazing point position of the user by tracking the eyeball movement of the user and calculating the distance from the eyes of the user to the display device. According to the position of the user gazing point and the distance from the eyes to the display device, an included angle between a pixel near the gazing point on the display device and the sight line of the user is calculated, and the position of the pixel imaged on the retina can be obtained. And then the pixels of the image displayed by the display device within the range of 0-10 degrees from the user's gaze point are imaged on the focusing display layer of the display device, and the pixels within the range of 10-20 degrees from the user's gaze point are imaged on the defocusing display layer of the display device, so that the myopia defocusing image can be formed within the range of 10-20 degrees from the retina of the user. When the user's fixation point moves, the focusing area and the myopic defocus area also move correspondingly, so that the user can continuously obtain the near-focus defocus stimulus at the side center and can clearly see the image.
According to the embodiment of the application, the light field display system for myopia prevention and control can generate the myopia out-of-focus image in the side central area beside the fovea of the macula lutea, namely, the light is focused in front of the retina, so that the increase of the axis of the eye can be controlled, and the myopia deepening of a user can be effectively controlled.
Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that the application is not limited to the details of construction, arrangement, or method of implementation described herein; on the contrary, the intention is to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (13)
1. A light field display system for myopia prevention and control, comprising:
a display component capable of producing an in-focus image that is imaged on a user's retina and an out-of-focus image that is imaged in front of the user's retina;
the eye movement tracking device is used for tracking the eyeball movement of the user and calculating the distance from the eyes of the user to the display assembly to obtain the position of the fixation point of the user;
and the control component is used for determining a first range and a second range according to the gaze point position detected by the eye tracking device, and enabling the images in the first range to form an in-focus image and the images in the second range to form an out-of-focus image.
2. A light field display system as claimed in claim 1, wherein the display assembly comprises a first display device and a second display device,
the first display device is used for generating an in-focus image;
the second display device is used for generating an out-of-focus image.
3. A light field display system as claimed in claim 2, characterized in that the first display device comprises at least one transparent display device and/or the second display device comprises a non-transparent display device.
4. A light field display system as claimed in claim 2 or 3 wherein the first and second display devices are parallel to each other.
5. A light field display system as claimed in claim 4, characterized in that a refractive material and/or a mechanical or electromechanical translation means is arranged between the second display means and the first display means.
6. A light field display system as claimed in claim 2 or 3 wherein the first and second display devices are perpendicular to each other and the combining of the in-focus and out-of-focus images is achieved by further including a semi-reflective semi-transparent mirror in the display assembly.
7. A light field display system as claimed in claim 6, wherein the transflective mirror is a curved transflective mirror.
8. The light field display system of claim 1, wherein the display assembly is a multi-layer liquid crystal display device, and the in-focus image and the out-of-focus image are located in different layers of the multi-layer liquid crystal display device.
9. A light field display system as claimed in claim 1 wherein the display assembly comprises a single display device and a set of optical path folding mirrors for providing a folded optical path.
10. A light field display system as claimed in claim 1 wherein the display assembly comprises a single display device and a microlens array forming a spatial image in a focal plane of at least two microlenses, the focal plane being located in front of or behind the single display device.
11. The light field display system of claim 1, wherein the control component determines a first range and a second range by calculating an included angle value between a pixel near the gaze point and a user's line of sight, wherein the first range is a pixel region where the included angle value is not greater than 10 degrees, and the second range is a pixel region where the included angle value is greater than 10 degrees and not greater than 20 degrees.
12. A light field display system as claimed in claim 11, wherein the image within the pixel region where the included angle value is greater than 20 degrees is an out-of-focus image or an in-focus image.
13. A light field display system as claimed in claim 5, wherein the optical path of the first display device and/or the second display device to the user's eye is adjustable to produce different intensities of myopic defocus effects:
y＝1/(1/x+P)；
wherein, P is the target defocusing amount, y is the optical path from the second display device to the user's eyes, and x is the optical path from the first display device to the user's eyes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023220947A1 (en) * | 2022-05-17 | 2023-11-23 | 上海睿视健康科技有限公司 | Defocus display system |
| CN117706790A (en) * | 2024-02-05 | 2024-03-15 | 奥琳光学科技(苏州)有限公司 | Virtual reality equipment and peripheral retina defocus adjustment method |
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2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023220947A1 (en) * | 2022-05-17 | 2023-11-23 | 上海睿视健康科技有限公司 | Defocus display system |
| CN117706790A (en) * | 2024-02-05 | 2024-03-15 | 奥琳光学科技(苏州)有限公司 | Virtual reality equipment and peripheral retina defocus adjustment method |
| CN117706790B (en) * | 2024-02-05 | 2024-05-24 | 奥琳光学科技(苏州)有限公司 | Virtual reality equipment and peripheral retina defocus adjustment method |
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