CN111221126B - Imaging system, imaging method and virtual reality equipment - Google Patents
Imaging system, imaging method and virtual reality equipment Download PDFInfo
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- CN111221126B CN111221126B CN202010057730.0A CN202010057730A CN111221126B CN 111221126 B CN111221126 B CN 111221126B CN 202010057730 A CN202010057730 A CN 202010057730A CN 111221126 B CN111221126 B CN 111221126B
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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
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
Abstract
The invention discloses an imaging system, an imaging method and virtual reality equipment, wherein the imaging system comprises a display unit, a mirror group, N holographic elements and M transparent electrode groups, N is a positive integer larger than 1, M is a positive integer larger than 1, the mirror group is arranged on one side of the holographic elements close to the display unit or one side of the holographic elements far away from the display unit, each transparent electrode group comprises an upper transparent electrode and a lower transparent electrode, and the holographic elements are clamped by the upper transparent electrodes and the lower transparent electrodes. The invention provides an imaging system, an imaging method and virtual reality equipment, and aims to solve the problems that convergence adjustment conflict cannot be effectively solved when a user uses the virtual reality equipment in the prior art, and the user is easy to have visual fatigue, dizziness and nausea.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an imaging system, an imaging method and virtual reality equipment.
Background
In Virtual Reality (VR) technology, when a display unit displays a picture, light rays emitted from the display unit usually pass through a lens group, and are focused and aberration is adjusted after the combined action of the lens group.
In order to better display the picture in a 3D manner, different images are respectively displayed through two eyes so as to enable a user to generate a stereoscopic vision effect, when the two eyes of the user focus on a virtual image surface and see the image clearly, the two different images can enable the user to observe the image with distance feeling through the retinas, but the distance feeling of the image starts from vergence reflection of human eyes, the two eyes are gathered, and the image tries to be refocused on a distance feeling place generated by a brain so as to feel the 3D stereoscopic feeling. However, in general, the convergence plane is not coincident with the virtual image plane, the eyes of the user constantly adjust between the focus and the convergence, the adjustment process easily causes the user to feel dizzy and nausea when the user observes the image, and when the separation distance between the virtual image plane and the convergence plane is larger, the degree of convergence adjustment conflict is larger, so that the user is more easily caused to generate adverse reactions.
In the existing VR equipment, because the VR equipment can only provide one or two virtual image surfaces, a user can view a 3D effect picture with small depth of field by observing nearby the virtual image surfaces, and the problem of convergence adjustment conflict cannot be effectively solved.
Disclosure of Invention
The invention provides an imaging system, an imaging method and virtual reality equipment, and aims to solve the problems that convergence adjustment conflict cannot be effectively solved when a user uses the virtual reality equipment in the prior art, and the user is easy to have visual fatigue, dizziness and nausea.
In order to achieve the above object, the present invention provides an imaging system, which includes a display unit, a mirror group, N holographic elements, and M transparent electrode groups, where N is a positive integer greater than 1, and M is a positive integer greater than 1, the mirror group is disposed on one side of the holographic elements close to the display unit or on one side of the holographic elements far from the display unit, the transparent electrode groups include upper transparent electrodes and lower transparent electrodes, and the upper transparent electrodes and the lower transparent electrodes clamp the holographic elements.
Optionally, the holographic element has optical power.
Optionally, the upper transparent electrode has a single-chip structure or a multi-chip array structure, and the lower transparent electrode has a single-chip structure or a multi-chip array structure.
Optionally, the upper transparent electrode includes a plurality of first sub transparent electrodes, the lower transparent electrode includes a plurality of second sub transparent electrodes, the plurality of first sub transparent electrodes are connected to each other along the end edges, and the plurality of second sub transparent electrodes are connected to each other along the end edges.
Optionally, the plurality of first sub transparent electrodes are connected in series along a first direction, the plurality of second sub transparent electrodes are connected in series along a second direction, and the first direction is perpendicular to the second direction.
Optionally, the imaging system includes a plurality of the display units, and the imaging system further includes a beam splitter prism, and a plurality of light emitting surfaces of the display units are all directed to the beam splitter prism.
In order to achieve the above object, the present application provides an imaging method applied to an imaging system, the imaging system including a display unit, N hologram elements, and M transparent electrode groups, N being a positive integer greater than 1, and M being a positive integer greater than 1, the imaging method including:
acquiring the depth of field information of the currently displayed sub-picture;
determining the refreshing frequency of the display unit and a transparent electrode group corresponding to the sub-picture according to the depth of field information;
and controlling the display unit and the transparent electrode group to work according to the refreshing frequency.
Optionally, the imaging system includes a plurality of the display units, and the step of determining the refresh frequency of the display unit and the transparent electrode group corresponding to the sub-picture according to the depth information includes:
determining the refreshing frequency and the display sequence of each display unit and the transparent electrode group corresponding to the sub-picture according to the depth of field information;
the step of controlling the display unit and the transparent electrode group to work according to the refresh frequency comprises the following steps:
And controlling a plurality of display units and the transparent electrode group to work according to the refreshing frequency and the display sequence.
Optionally, before the step of determining the transparent electrode group corresponding to the sub-picture according to the depth information, the method further includes:
determining a holographic element corresponding to the sub-picture according to the depth information;
and determining a corresponding transparent electrode group according to the holographic element.
In order to achieve the above object, the present application provides a virtual reality device, which includes a housing and the imaging system according to any one of the above embodiments, wherein the imaging system is accommodated in the housing.
In the technical solution provided by the present application, the imaging system includes a display unit, a mirror group, N holographic elements, and M transparent electrode groups, where N is a positive integer greater than 1, M is a positive integer greater than 1, the transparent electrode group comprises an upper transparent electrode and a lower transparent electrode, the upper transparent electrode and the lower transparent electrode are arranged on two sides of the holographic element, the control circuit is electrically connected with the upper transparent electrode and the lower transparent electrode, when the control circuit controls the upper transparent electrode and the lower transparent electrode to work, an electric field is formed between the upper transparent electrode and the lower transparent electrode, so that the arrangement orientation of liquid crystal molecules in the holographic element is changed, and further changing the refractive index distribution of the hologram element, thereby losing the diffraction effect of the hologram element and allowing light to directly pass through the hologram element. The hologram element is capable of diffracting an illumination beam by controlling the transparent electrodes on both sides of the hologram element, thereby controlling the electric field at both ends of the hologram element. A plurality of holographic elements coincide and use and control respectively through transparent electrode group, and different holographic elements provide different virtual distances, and different image depth of field and its corresponding virtual distance cooperation work to solve the user and can't effectual solution vergence and adjust the conflict when using virtual reality equipment among the prior art, made the user produce visual fatigue easily and dizzy problem of nausea.
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 structures shown in the drawings without creative efforts.
FIG. 1 is a schematic block diagram of one embodiment of an imaging system of the present invention;
FIG. 2 is a schematic block diagram of yet another embodiment of the imaging system of the present invention;
FIG. 3 is a schematic block diagram of yet another embodiment of the imaging system of the present invention;
FIG. 4 is a schematic structural view of yet another embodiment of the imaging system of the present invention;
FIG. 5 is a schematic structural view of yet another embodiment of the imaging system of the present invention;
FIG. 6 is a schematic block diagram of yet another embodiment of the imaging system of the present invention;
FIG. 7 is a schematic view of a display system having one embodiment of a plurality of holographic elements in accordance with the present invention;
FIG. 8 is a schematic view of a display system of the present invention having yet another embodiment of a plurality of holographic elements;
FIG. 9 is a schematic diagram of a display system having a plurality of display units according to the present invention;
FIG. 10 is a schematic structural diagram of one embodiment of the imaging method of the present invention;
FIG. 11 is a schematic structural view of yet another embodiment of the imaging method of the present invention;
fig. 12 is a schematic structural view of still another embodiment of the imaging method of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
22 | Lower |
| 20 | |
221 | |
| 21 | Upper |
30 | |
| 211 | First sub |
40 | Lens group |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an imaging system, an imaging method and virtual reality equipment.
Referring to fig. 1, the imaging system includes a display unit 30, a mirror group 40, N holographic elements 10, and M transparent electrode groups 20, where N is a positive integer greater than 1, and M is a positive integer greater than 1, the mirror group 40 is disposed on one side of the holographic element 10 close to the display unit 30 or on one side of the holographic element 10 away from the display unit 30, the transparent electrode group 20 includes an upper transparent electrode 21 and a lower transparent electrode 22, and the upper transparent electrode 21 and the lower transparent electrode 22 sandwich the holographic element 10. The imaging system further includes a control circuit electrically connected to the upper transparent electrode 21 and the lower transparent electrode 22.
Preferably, N of the holographic elements 10 have X different virtual distances, N may be greater than or equal to or less than X, N different holographic elements 10 may be adapted to X different convergence planes, and in addition, N may be greater than or equal to or less than M, and the transparent electrode assembly 30 may control a single holographic element 10 or a combination of a plurality of the holographic elements 10. The multiple first holographic elements are overlapped to provide different virtual image distances, so that different virtual image distances are corresponding to different depths of field in the image.
The material of the holographic element 10 may be liquid crystal, polymer dispersed liquid crystal, photorefractive crystal, etc. For a photorefractive crystal, the refractive index distribution of the holographic element 10 is also changed by the photoelectric effect inside the crystal caused by the electric field applied by the transparent electrodes, thereby realizing the switching function of the holographic element 10.
Referring to fig. 2, specifically, when the control circuit controls the upper transparent electrode 21 and the lower transparent electrode 22 to work, an electric field is formed between the upper transparent electrode 21 and the lower transparent electrode 22, so that the arrangement orientation of the liquid crystal molecules inside the holographic element 10 is changed, the refractive index distribution of the holographic element 10 is further changed, the diffraction efficiency of the element is reduced, when the electric field is large enough, the holographic element completely loses the diffraction effect and directly transmits light, and the light directly transmits through the holographic element 10 without any change. When the control circuit does not control the upper transparent electrode 21 and the lower transparent electrode 22 to work, no electric field exists between the upper transparent electrode 21 and the lower transparent electrode 22, and the holographic element 10 can generate diffraction effect on light.
In the embodiment of the present application, when the control circuit controls the upper transparent electrode 21 and the lower transparent electrode 22 to work, an electric field is formed between the upper transparent electrode 21 and the lower transparent electrode 22, so that the arrangement orientation of the liquid crystal molecules inside the holographic element 10 is changed, and further the refractive index distribution of the holographic element 10 is changed, so that the holographic element 10 loses the diffraction effect, and light directly penetrates through the holographic element 10. The hologram element 10 is capable of diffracting an illumination beam by controlling the transparent electrodes on both sides of the hologram element 10, thereby controlling the electric field at both ends of the hologram element 10. Because different holographic elements 10 have different focal powers and can provide different virtual distances, the switching of the holographic elements and the switching of the different virtual distances are realized in an electric control mode of the transparent electrode, so that the different depth of field positions of one picture can be matched with the corresponding virtual distances, and the problems that in the prior art, a user cannot effectively solve the convergence adjustment conflict when using virtual reality equipment, and the user is easy to cause visual fatigue and dizziness and nausea are solved.
In a preferred embodiment, the hologram element has optical power, and particularly, the hologram element has positive optical power, and the hologram element can converge light entering the hologram element, so that the optical power requirement of the imaging system on the lens group is reduced, the number of lenses of the lens group is reduced, and the volume and the weight of the lens group are reduced.
Referring to fig. 2, in an alternative embodiment, the hologram element 10 is a transmission type hologram element or a reflection type hologram element.
The hologram element 10 uses two coherent light beams as a first recording light beam and a second recording light beam during a recording and structuring process, wherein the first recording light beam is a plane wave, the second recording light beam is a spherical wave, the first recording light beam and the second recording light beam irradiate the surface of the hologram recording medium at a certain angle, and an interference pattern formed after coherent superposition is recorded by the hologram recording medium. Thereby completing the recording process of the hologram element 10. Specifically, the holographic recording medium may be silver halide, dichromate, photopolymer, holographic-polymer dispersed liquid crystal, or the like.
When the hologram element 10 is used, the hologram element 10 is irradiated with an illumination beam, wherein the illumination beam is the same as the second recording beam, an angle between the illumination beam and the hologram element 10 is an angle between the second recording beam and the hologram recording medium, and the illumination beam is diffracted by the hologram and reproduces a beam of light, called a reproduction beam, which is the same as the first recording beam on the other side of the hologram element 10.
Wherein the first recording beam and the second recording beam are positioned on one side of the hologram recording medium when the transmission type hologram element is configured, and the first recording beam and the second recording beam are positioned on both sides of the hologram recording medium when the reflection type hologram element is configured. In the operation of the transmission type hologram element, the illumination beam and the reconstruction beam of the transmission type hologram element are respectively positioned at two sides of the hologram element 10, namely, the illumination beam penetrates the hologram element 10 to generate the reconstruction beam, in the operation of the reflection type hologram element, the illumination beam and the reconstruction beam are positioned at the same side of the hologram element 10, and the light is reflected by the hologram element 10 to generate the reconstruction beam.
Referring to fig. 3, in a preferred embodiment of the above-mentioned embodiments, the upper transparent electrode 21 has a monolithic structure, and the lower transparent electrode 22 also has a monolithic structure, specifically, the area of the upper transparent electrode 21 is the same as the area of the hologram element 10, and the area of the lower transparent electrode 22 is the same as the area of the hologram element 10. When the control circuit controls the upper transparent electrode 21 and the lower transparent electrode 22 to operate, since the areas of the upper transparent electrode 21 and the lower transparent electrode 22 are the same as those of the hologram element 10, a uniform electric field can be generated in the hologram element 10.
Referring to fig. 4 and 5, in a preferred embodiment of the foregoing embodiment, the upper transparent electrode 21 includes a plurality of first sub-transparent electrodes 211, the lower transparent electrode 22 includes a plurality of second sub-transparent electrodes 221, the plurality of first sub-transparent electrodes 211 are distributed in an array, the plurality of second sub-transparent electrodes 221 are distributed in an array, specifically, the first sub-transparent electrodes 211 are all electrically connected to the control circuit, and different first sub-transparent electrodes 211 are controlled independently from each other, the second sub-transparent electrodes 221 are all electrically connected to the control circuit, and different second sub-transparent electrodes 221 are controlled independently from each other, so that the control circuit can control part or all of the first sub-transparent electrodes 211 and/or the second sub-transparent electrodes 221 according to actual conditions, thereby controlling the positions of the holographic elements 10 in corresponding regions to generate an electric field, the corresponding area of the holographic element 10 is made non-diffractive.
It is understood that the shape of the transparent electrode may be a square or a hexagon or a circle or other shapes, and the first sub transparent electrode 211 and the second sub transparent electrode 221. The side length or diameter of the first sub-transparent electrode 211 and the second sub-transparent electrode 221 may be 2 μm, 3 μm, or 5 μm.
In an alternative embodiment, a plurality of the first sub-transparent electrodes 211 are connected in series along a first direction, a plurality of the second sub-transparent electrodes 221 are connected in series along a second direction, the first direction and the second direction are perpendicular to each other, specifically, the upper transparent electrode 31 includes a plurality of the first sub-transparent electrodes 211311, the lower transparent electrode 32 includes a plurality of the second sub-transparent electrodes 221321, the first sub-transparent electrodes 211 are connected in series in a row unit, the second sub-transparent electrodes 221 are connected in series in a column unit, and the first sub-transparent electrodes 211 and the second sub-transparent electrodes 221 are connected in series in a perpendicular to each other, so as to form an addressable array electrode, which is convenient for controlling the array electrode.
In a preferred embodiment, the number of rows and the number of columns of the first sub-transparent electrodes 211 may be equal or different, and the number of rows and the number of columns of the second sub-transparent electrodes 221 may be equal or different. In a preferred embodiment, the first sub-transparent electrodes 211 and the second sub-transparent electrodes 221 are equal in number and correspond to each other.
Referring to fig. 6, in an alternative embodiment, the imaging system includes N holographic elements 10 and M transparent electrode sets 20, where N is a positive integer greater than 1, and M is a positive integer greater than 1, where each holographic element 10 has a different preset virtual image distance, specifically, each holographic element 10 corresponds to one transparent electrode set 20, and one holographic element 10 and another adjacent holographic element 10 may share one sub-transparent electrode.
In a specific embodiment, the imaging system comprises 5 holographic elements 10, wherein the virtual distance of a first holographic element 10 is 30cm, the virtual distance of a second holographic element 10 is 80cm, the virtual distance of a third holographic element 10 is 180cm, the virtual distance of a fourth holographic element 10 is 300cm, and the virtual distance of a fifth holographic element 10 is 500cm, when the third holographic element 10 works, the holographic elements 10 at two sides of the other holographic elements 10 except the third holographic element 10 can be respectively applied with positive voltage and negative voltage, so that the other holographic elements 10 lose diffraction effect, and the third holographic element 10 can work independently, in another specific embodiment, when the third holographic element 10 works, voltages can be respectively applied to the sub-transparent electrodes at two ends of the first holographic element 10 and the fifth holographic element 10, and applying a voltage opposite to that of the first and fifth hologram elements 10 and 10 to the sub-transparent electrodes at both sides of the third hologram element 10, so that the third hologram element 10 is not affected by the electric field between the first and fifth hologram elements 10 and 10.
In the above specific embodiment, each of the hologram elements 10 has a typical thickness of 2 μm to 5 μm, the sub-transparent electrode has a thickness of 500nm to 1 μm, and when the imaging system includes 5 of the hologram elements 10, the total thickness of the plurality of the hologram elements 10 is 13 μm to 31 μm. In addition, the refractive index of the sub transparent electrode is equal to the refractive index of the hologram element 10.
When the imaging system includes a plurality of holographic elements 10, the light emitted by the display unit 30 is from a plurality of holographic elements 10, each holographic element 10 has a different preset virtual image distance, when the display unit 30 displays a picture, the vergence plane can be determined according to the picture, the holographic element 10 corresponding to the virtual image plane with the nearest vergence plane distance is selected from the holographic elements 10, and through the control circuit, the other holographic elements 10 in the imaging system increase the electric field to stop working, so that the holographic element 10 corresponding to the virtual image plane with the nearest vergence plane works, and the diffraction effect is maintained.
Referring to fig. 7, in an alternative embodiment, when the image displayed by the display unit 30 is a large-depth image, since the large-depth image is displayed with more convergence planes, in order to facilitate the display of the image, the large-depth image may be divided into three convergence planes, the three convergence planes are a first convergence plane 201, a second convergence plane 202 and a third convergence plane 203, the first convergence plane 201 is a near-depth convergence plane, the second convergence plane 202 is a medium-depth convergence plane, the third convergence plane 203 is a far-depth convergence plane, the virtual image 101 of the display system is close to the second convergence plane 202, and the large-depth image may be displayed by selecting the first holographic elements 20 corresponding to different convergence planes to operate.
In order to enable a user to clearly view the large depth of field picture, in a preferred embodiment, to achieve a 3D display effect of the image, different areas of the picture may be displayed with different ones of the holographic elements 10, in one embodiment, the holographic elements 10 each comprise a plurality of sub-transparent electrodes, and the large depth of field pictures comprise sun, white clouds and portrait, wherein the portrait is displayed in a square shape, the white cloud is displayed in a circular shape, the sun is displayed in a triangular shape, the portrait is positioned in the center of the large depth-of-field picture, the white cloud is positioned at the upper left side of the large depth-of-field picture, the sun is positioned at the upper right side of the large depth-of-field picture, when the display unit 30 displays the large-depth-of-field picture, controlling the central region of the first holographic element 20 corresponding to the first convergence plane 201 to work, so that the first virtual image plane 101 corresponding to the first holographic element 20 is close to the first convergence plane 201; controlling the upper left area of the first holographic element 20 corresponding to the second vergence plane 202 to work, so that the second virtual image plane 102 corresponding to the first holographic element 20 is close to the second vergence plane 202; controlling the upper right area of the first holographic element 20 corresponding to the third vergence plane 203 to work; by bringing the third virtual image plane 103 corresponding to the first hologram element 20 close to the third convergence plane 201, images in different regions with different depths of field can be displayed according to the depths of field, thereby reducing the influence of convergence adjustment conflict.
Referring to fig. 8, in the above preferred embodiment, when the number of the vergences of the large-depth picture is greater than three, the number of the holographic elements 10 used in the imaging system is also greater than three, which may cause crosstalk between adjacent holographic elements 10, thereby causing the quality of the displayed image to be poor, and phenomena such as ghost, color cast, and uneven brightness to occur. To solve this problem, when the large depth picture has more convergence planes, the large depth picture can be sequentially displayed through the regions with different depths. Specifically, when the large depth-of-field picture is displayed, the large depth-of-field picture may be divided into sub-pictures with different depths of field, then the holographic element 10 corresponding to the sub-pictures is selected according to the depths of field corresponding to the different sub-pictures, when the display unit 30 displays the large depth-of-field picture, the control unit may control the display unit 60 to sequentially continue displaying the different sub-pictures according to a preset time interval, and control the holographic element 10 corresponding to the sub-pictures to diffract when the sub-pictures are displayed, and when the sub-pictures are all sequentially displayed and the sum of the display times of all the sub-pictures is small, the sub-pictures are superimposed into a complete large depth-of-field image due to the effect of persistence of vision of human eyes. The holographic elements 10 work in time sequence, and crosstalk does not exist between the holographic elements, so that the imaging quality of the displayed picture is guaranteed.
It can be understood that, in order to ensure the viewing effect of the user, the refresh frequency of the display unit 30 is 60fps, when the large-depth picture includes 5 sub-pictures, 5 holographic elements 10 are required to be cooperatively displayed, and in order to ensure the display effect of the display unit 30, the refresh frequency of the display unit 30 is 60 × 5 — 300fps to implement the above-mentioned display process of the large-depth picture.
Referring to fig. 9, when the large depth of field picture is displayed, because the requirement on the refresh frequency of the display unit 30 is high, in order to reduce the requirement of the imaging system on the display unit 30, the imaging system may include a plurality of display units 30, light emitted by the plurality of display units 30 enters the beam splitter prism, is emitted from the beam splitter prism after being transmitted or reflected by the beam splitter prism, and is transmitted to the human eye after passing through the imaging system, and when the large depth of field picture includes 5 sub-pictures, the requirement on losing the refresh frequency of the display units 30 may be reduced by sequentially displaying the plurality of display units 30. Specifically, when the imaging system includes 3 display units 30, in order to display the large depth-of-field picture, the requirement on the refresh frequency of each display unit 30 is 100 fps.
Referring to fig. 10, to achieve the above object, the present application further provides an imaging method, where the imaging method is applied to an imaging system, specifically, the imaging system includes a display unit 30, N holographic elements 10, and M transparent electrode groups 20, where N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1, the display unit 30 is configured to display an imaged picture, and the imaged picture includes a plurality of sub-pictures, and the imaging method includes:
s100, acquiring depth of field information of a currently displayed sub-picture;
s200, determining the refresh frequency of the display unit 30 and the transparent electrode group 20 corresponding to the sub-picture according to the depth of field information;
the depths of field of different objects in the same sub-picture are similar, so that the sub-picture can be clearly displayed after being adjusted by the holographic element 10.
After the depth information of the sub-pictures is obtained, the number of the sub-pictures in the imaged picture is determined according to the number of the sub-pictures, specifically, usually, the refresh frequency of the display unit 30 is 60 frames per second, and when the imaged picture includes 3 sub-pictures, the refresh frequency of the display unit 30 is required to be 60 × 3 — 180 frames per second. The refresh frequency is the refresh frequency of the display unit 30 and also the operating frequency of the transparent electrode set.
And S300, controlling the display unit 30 and the transparent electrode group 20 to work according to the refresh frequency.
Wherein, when the imaging system comprises a holographic elements 10, the display unit 30 determines the holographic elements 10 and the transparent electrode set 20 corresponding to one of the sub-pictures when displaying one of the sub-pictures, when the b-th holographic element 10 is operated, the holographic elements 10 at both sides of the holographic elements 10 except the b-th holographic element 10 can be applied with positive voltage and negative voltage respectively, so as to make the other holographic elements 10 lose diffraction effect and make the b-th holographic element 10 independently operate, in another specific embodiment, the voltages can be applied to the transparent electrodes at both ends of the first holographic element 10 and the a-th holographic element 10 respectively, and the voltages opposite to the voltages applied to the sub-transparent electrodes at both sides of the b-th holographic element 10 and the first holographic element 10 and the a-th holographic element 10 respectively, so that the b-th holographic element 10 is not influenced by the electric field between the first holographic element 10 and the a-th holographic element 10.
Specifically, the plurality of transparent electrode groups 20 may work simultaneously or sequentially, and when the plurality of transparent electrode groups 30 work sequentially, the plurality of transparent electrode groups may work sequentially according to an arrangement order of the depth of field of the corresponding sub-picture from far to near or from near to far, or according to a display time sequence of the sub-picture.
Referring to fig. 11, in an alternative embodiment, the imaging system includes a plurality of display units 30, and the step S200 includes:
s210, determining a refresh frequency and a display sequence of each display unit 30 and a transparent electrode group corresponding to the sub-picture according to the depth information;
after the above step S210, the step S300 includes:
and S310, controlling the plurality of display units 30 and the transparent electrode group to work according to the refreshing frequency and the display sequence.
In a specific embodiment, the display order of the sub-pictures by the display unit 30 is from far to near or from near to far according to the depth information, so that the display unit 30 can display the sub-pictures and the transparent electrode groups can work in sequence.
Referring to fig. 12, in an alternative embodiment, before the step S200, the method further includes:
s220, determining the holographic element 10 corresponding to the sub-picture according to the depth information;
s230, determining the corresponding transparent electrode set 20 according to the holographic element 10.
The imaging picture is divided into a plurality of sub-pictures according to the depth of field information, when the imaging picture is displayed, the imaging picture can be firstly divided into sub-pictures with different depths of field, then the holographic element 10 corresponding to the sub-pictures is selected according to the depths of field corresponding to the different sub-pictures, when the imaging picture is displayed on the display unit 30, the refreshing frequency and the display sequence of the display unit 30 can be firstly determined, the different sub-pictures can be sequentially and continuously displayed according to the display sequence at preset time intervals, the holographic element 10 corresponding to the sub-pictures is controlled to diffract when the sub-pictures are displayed, and when the sub-pictures are completely and sequentially displayed, due to the effect of persistence of vision of human eyes, the sub-pictures are overlapped into a complete large-depth-field image.
In order to achieve the above object, the present application further provides a virtual reality device, which includes a housing and the imaging system according to any one of the above embodiments, wherein the imaging system is accommodated in the housing.
The present application further provides a computer-readable storage medium comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, further implementing the steps of the imaging method according to any of the above embodiments.
In some alternative embodiments, the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the device, such as a hard disk or a memory of the device. The memory may also be an external storage device of the device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the device. Further, the memory may also include both internal and external storage units of the device. The memory is used for storing the computer program and other programs and data required by the device. The memory may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The present invention further provides a virtual reality device, where the virtual reality device includes the imaging system according to any of the above embodiments, and the specific structure of the imaging system refers to the above embodiments, and since the imaging system adopts all technical solutions of all the above embodiments, the imaging system at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated here.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an imaging system, its characterized in that, imaging system includes display element, mirror group, a N holographic element and a M transparent electrode group, and N is for being greater than 1 positive integer, and M is for being greater than 1 positive integer, the mirror group is located holographic element is close to one side of display element or is located holographic element keeps away from one side of display element, transparent electrode group includes transparent electrode and lower transparent electrode, go up transparent electrode with lower transparent electrode centre gripping holographic element sets up, N holographic element has the virtual image distance of X difference, and N can be more than or equal to or be less than X.
2. The imaging system of claim 1, wherein the holographic element has optical power.
3. The imaging system of claim 1, wherein the upper transparent electrode is of a monolithic structure or a multichip array structure and the lower transparent electrode is of a monolithic structure or a multichip array structure.
4. The imaging system of claim 1, wherein the upper transparent electrode comprises a plurality of first sub-transparent electrodes, the lower transparent electrode comprises a plurality of second sub-transparent electrodes, the plurality of first sub-transparent electrodes are connected to each other along edges, and the plurality of second sub-transparent electrodes are connected to each other along edges.
5. The imaging system of claim 4, wherein a plurality of the first sub transparent electrodes are connected in series along a first direction, and a plurality of the second sub transparent electrodes are connected in series along a second direction, the first direction and the second direction being perpendicular to each other.
6. The imaging system of claim 1, comprising a plurality of said display units, said imaging system further comprising a beam splitting prism, light emitting faces of said plurality of display units each directed toward said beam splitting prism.
7. An imaging method applied to the imaging system according to any one of claims 1 to 6, the imaging method comprising:
acquiring the depth of field information of the currently displayed sub-picture;
determining the refreshing frequency of the display unit and a transparent electrode group corresponding to the sub-picture according to the depth of field information;
And controlling the display unit and the transparent electrode group to work according to the refreshing frequency.
8. The imaging method according to claim 7, wherein the imaging system comprises a plurality of the display units, and the step of determining the refresh frequency of the display units and the transparent electrode group corresponding to the sub-picture according to the depth information comprises:
determining the refreshing frequency and the display sequence of each display unit and the transparent electrode group corresponding to the sub-picture according to the depth of field information;
the step of controlling the display unit and the transparent electrode group to work according to the refresh frequency comprises the following steps:
and controlling a plurality of display units and the transparent electrode group to work according to the refreshing frequency and the display sequence.
9. The imaging method according to claim 7, wherein the step of determining the refresh frequency of the display unit and the transparent electrode group corresponding to the sub-picture according to the depth information is preceded by the step of:
determining a holographic element corresponding to the sub-picture according to the depth information;
and determining a corresponding transparent electrode group according to the holographic element.
10. A virtual reality device comprising a housing and an imaging system as claimed in any one of claims 1 to 6, the imaging system being housed within the housing.
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Effective date of registration: 20221129 Address after: 261031 workshop 1, phase III, Geer Photoelectric Industrial Park, 3999 Huixian Road, Yongchun community, Qingchi street, high tech Zone, Weifang City, Shandong Province Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 No. 268 Dongfang Road, hi tech Industrial Development Zone, Shandong, Weifang Patentee before: GOERTEK Inc. |