CN112305778B - Method and system for expanding field angle of integrated imaging three-dimensional display system - Google Patents

Method and system for expanding field angle of integrated imaging three-dimensional display system Download PDF

Info

Publication number
CN112305778B
CN112305778B CN202011238117.5A CN202011238117A CN112305778B CN 112305778 B CN112305778 B CN 112305778B CN 202011238117 A CN202011238117 A CN 202011238117A CN 112305778 B CN112305778 B CN 112305778B
Authority
CN
China
Prior art keywords
light
display
polarization
dimensional display
integrated imaging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202011238117.5A
Other languages
Chinese (zh)
Other versions
CN112305778A (en
Inventor
刘娟
赵紫峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Institute of Technology BIT
Original Assignee
Beijing Institute of Technology BIT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Institute of Technology BIT filed Critical Beijing Institute of Technology BIT
Priority to CN202011238117.5A priority Critical patent/CN112305778B/en
Publication of CN112305778A publication Critical patent/CN112305778A/en
Application granted granted Critical
Publication of CN112305778B publication Critical patent/CN112305778B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/30—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving parallax barriers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

Provided are an integrated imaging three-dimensional display system viewing angle expansion method and system, wherein a viewing angle expansion unit is provided to the integrated imaging three-dimensional display system, the viewing angle expansion unit including a polarization controller and a polarization grating; and expanding the field angle of the integrated imaging three-dimensional display system by using the field angle expansion unit. The system does not influence other display performances, does not introduce a complex mechanical structure, and enlarges the viewing angle.

Description

Method and system for expanding field angle of integrated imaging three-dimensional display system
Technical Field
The invention relates to a method and a system for expanding a field angle of an integrated imaging three-dimensional display system, belonging to the field of three-dimensional display.
Background
Two-dimensional flat panel displays have been developed to date, and have excellent performance in terms of spatial resolution, viewing angle, brightness, color, and the like. However, the two-dimensional display can only reflect the spatial position through the perspective relation and the shading shadow, which is easy to cause visual and cognitive errors, and the generation and development of the three-dimensional display technology, especially the active three-dimensional display technology, provides a solution to the problem. In a plurality of three-dimensional display technologies, the integrated imaging technology carries out discretized sampling and reconstruction on a three-dimensional light field, balance is carried out between three-dimensional mass data and human eye vision requirements, and the three-dimensional light field has wide research interest due to the advantages of simple structure, incoherent illumination, full parallax and full color, physical depth prompt and the like, and has great development potential and commercial application prospect.
One of the major constraints of integrated imaging three-dimensional display systems is the limited field of view or viewing angle. According to the definition of the field angle and the calculation formula, the conventional method is to increase the pitch (or the lens aperture) of the microlens array and reduce the object distance in the reconstruction process. However, the above method usually results in an increase of the sampling interval, which results in image blurring and depth reduction, or in a change of the number of samples, which affects the balance between the spatial resolution and the three-dimensional effect. In recent years, some non-stationary optical methods based on high-speed vibration microlens arrays or synthetic aperture integrated imaging, methods of adding relay optical systems, and methods of curved microlens arrays have been proposed in succession. Although these schemes effectively enlarge the field angle, they usually introduce mechanical structures to greatly increase the complexity of the system or introduce image distortion to affect the display effect.
In view of the above, the present invention aims to provide a method and a system for expanding the field angle of an integrated imaging three-dimensional display system, so as to solve one or more of the technical problems.
Disclosure of Invention
To solve one or more technical problems in the prior art, according to an aspect of the present invention, a method for expanding a field angle of an integrated imaging three-dimensional display system is provided. The method utilizes the characteristic that Polarization Gratings (PG) have different diffraction angles to incident light in different Polarization states, and realizes the expansion of the field angle by using a Polarization multiplexing and space-time multiplexing method under the condition of not obviously increasing the system volume.
The method for expanding the field angle of the integrated imaging three-dimensional display system is characterized by comprising the following steps of:
arranging a visual field angle expanding unit on the integrated imaging three-dimensional display system, wherein the visual field angle expanding unit comprises a polarization controller and a polarization grating;
and expanding the field angle of the integrated imaging three-dimensional display system by using the field angle expansion unit.
According to yet another aspect of the invention, the integrated imaging three-dimensional display system includes a light direction modulation unit and a display including an integrated two-dimensional display (e.g., a liquid crystal display, a light emitting diode display, etc.) or a two-dimensional display with a backlight of an array of point light sources.
According to yet another aspect of the invention, the polarization controller is disposed on or above a liquid crystal display or a light emitting diode display, or on or above a point light source array backlight of a display having a point light source array backlight.
According to another aspect of the present invention, the polarization grating is disposed on the light direction modulation unit, or disposed under the light direction modulation unit, or disposed on the polarization controller.
According to still another aspect of the present invention, the light direction modulation unit includes a microlens array.
According to still another aspect of the present invention, there is also provided an integrated imaging three-dimensional display system having an enlarged field angle, characterized by comprising:
a display;
a light direction modulation unit; and
and the field angle expanding unit comprises a polarization controller and a polarization grating.
According to yet another aspect of the invention, the display comprises an integrated two-dimensional display (e.g., a liquid crystal display, a light emitting diode display) or a display with a point light source array backlight.
According to yet another aspect of the invention, the polarization controller is disposed on or above a liquid crystal display or a light emitting diode display, or on or above a point light source array backlight of a display having a point light source array backlight.
According to another aspect of the present invention, the polarization grating is disposed on the light direction modulation unit, or disposed under the light direction modulation unit, or disposed on the polarization controller.
According to still another aspect of the present invention, the light direction modulation unit includes a microlens array.
Compared with the prior art, the invention has one or more of the following technical effects:
the method and the system do not affect other display performances; no complex mechanical structure is introduced; the viewing angle is enlarged.
Drawings
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments. The drawings relate to preferred embodiments of the invention and are described below:
FIG. 1a is a schematic diagram of the operation of a polarization grating, showing the incidence of right-handed circularly polarized light;
FIG. 1b is a schematic diagram of the operation of a polarization grating, showing the incident of left-handed circularly polarized light;
FIG. 2a is a block diagram of an integrated imaging three-dimensional display system with an enlarged field of view based on a conventional backlight according to a first preferred embodiment of the present invention;
FIG. 2b is a block diagram of an integrated imaging three-dimensional display system with an expanded field of view based on a conventional backlight according to a second preferred embodiment of the present invention;
FIG. 2c is a block diagram of an integrated imaging three-dimensional display system with an enlarged field of view based on a conventional backlight according to a third preferred embodiment of the present invention;
FIG. 3a is a schematic diagram of the operation of a conventional backlight based integrated imaging three-dimensional display system of the prior art;
FIG. 3b is a schematic diagram of an integrated imaging three-dimensional display system with an enlarged field of view based on a conventional backlight according to a first preferred embodiment of the present invention using PG to enlarge the field of view;
FIG. 3c is a schematic diagram of a conventional backlight-based integrated imaging three-dimensional display system with an expanded field of view using PG according to a first preferred embodiment of the present invention to expand the field of view (working when the PG deflection angle is small);
FIG. 3d is a schematic diagram of a conventional backlight-based integrated imaging three-dimensional display system with an expanded field of view using PG according to a first preferred embodiment of the present invention to expand the field of view (working when the deflection angle of PG is large);
FIG. 4a is a schematic diagram of the operation of a conventional backlight-based integrated imaging three-dimensional display system with an expanded field angle (using two adjacent microlenses for multiplexing) according to a third preferred embodiment of the present invention;
FIG. 4b is a schematic diagram of the operation of a conventional backlight based integrated imaging three-dimensional display system with an expanded field of view (using three adjacent microlenses for multiplexing) according to a third preferred embodiment of the present invention;
FIG. 5 is a block diagram of an integrated imaging three-dimensional display system with an expanded field of view based on a point light source array backlight according to a fourth preferred embodiment of the present invention;
FIG. 6a is a schematic diagram of the operation of a prior art integrated imaging three-dimensional display system based on a point light source array backlight;
FIG. 6b is a first schematic diagram of an integrated imaging three-dimensional display system with an expanded field of view based on a point light source array backlight according to a fourth preferred embodiment of the present invention;
fig. 6c is a second operational schematic diagram of an integrated imaging three-dimensional display system with an expanded field angle based on a point light source array backlight according to a fourth preferred embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Reference will now be made in detail to the various embodiments, one or more examples of which are illustrated in each figure. The examples are provided by way of explanation and are not meant as limitations. For example, features illustrated or described as part of one embodiment can be used on or in conjunction with any other embodiment to yield yet a further embodiment. It is intended that the present invention encompass such modifications and variations.
In the following description of the drawings, like reference numerals designate identical or similar structures. Generally, only the differences between the individual embodiments will be described. Descriptions of parts or aspects in one embodiment can also be applied to corresponding parts or aspects in another embodiment, unless explicitly stated otherwise.
Example 1
The invention provides a Polarization Grating (PG) and space-time multiplexing based field angle expanding method, and provides two solutions and five system structure examples of a conventional backlight and a Point Light Source Array (PLSA) backlight respectively. The invention has the advantage of enlarging the viewing angle on the premise of not influencing other display performances and not introducing a complex mechanical structure.
According to a preferred embodiment of the present invention, referring to fig. 2a-2c and fig. 5, a method for expanding the field angle of an integrated imaging three-dimensional display system is provided. The method for expanding the field angle of the integrated imaging three-dimensional display system is characterized by comprising the following steps of:
arranging a visual angle expanding unit on the integrated imaging three-dimensional display system, wherein the visual angle expanding unit comprises a polarization controller 2 and a polarization grating 4;
and expanding the field angle of the integrated imaging three-dimensional display system by using the field angle expansion unit.
According to a further preferred embodiment of the invention, the integrated imaging three-dimensional display system comprises a light direction modulation unit 3 and a display comprising an integrated two-dimensional display 1 or a display with a point light source array backlight 8.
Preferably, referring to fig. 5, a display having a point light source array backlight 8 includes the point light source array backlight 8 and an integrated liquid crystal modulation panel 9 (without backlight).
According to a further preferred embodiment of the invention, the polarization controller 2 is arranged on or above the integrated two-dimensional display 1 or on or above a point light source array backlight 8 of a display having a point light source array backlight 8.
According to another preferred embodiment of the present invention, the polarization grating 4 is disposed on the light direction modulation unit 3, or disposed under the light direction modulation unit 3, or disposed on the polarization controller 2.
According to still another preferred embodiment of the present invention, the light direction modulation unit 3 includes a microlens array.
There is also provided in accordance with yet another preferred embodiment of the present invention an integrated imaging three-dimensional display system having an enlarged field of view, including:
a display;
a light direction modulation unit 3; and
the viewing angle expanding unit comprises a polarization controller 2 and a polarization grating 4.
According to a further preferred embodiment of the invention the display comprises an integrated two-dimensional display 1 or a display with a backlight 8 of an array of point light sources.
According to a further preferred embodiment of the invention, the polarization controller 2 is arranged on or above the integrated two-dimensional display 1 or on or above a point light source array backlight 8 of a display having a point light source array backlight 8.
According to another preferred embodiment of the present invention, the polarization grating 4 is disposed on the light direction modulation unit 3, or disposed under the light direction modulation unit 3, or disposed on the polarization controller 2.
According to still another preferred embodiment of the present invention, the light direction modulation unit 3 includes a microlens array.
The principles of the present invention are described in further detail below, according to yet another preferred embodiment of the present invention.
The working principle of the conventional PG is shown in fig. 1a-1b, which has different diffraction angles for incident lights with different polarization states, wherein 011 is right-handed circularly polarized (RCP) incident light, 012 is left-handed circularly polarized (LCP) incident light, 02 is PG, 031 is LCP outgoing light, and 032 is RCP outgoing light. The sign rule of the specified diffraction angle is that the angle is uniformly acute from the optical axis to the ray, the clockwise direction is positive, the anticlockwise direction is negative, and the figure is uniformly marked with a positive value. Taking a transmission type PG shown in FIGS. 1a-1b as an example, for RCP incident light 011, LCP emergent light 031 with a diffraction angle of- | α | is obtained by 02 modulation, as shown in FIG. 1 a; incident LCP light 012 is modulated by 02 to obtain RCP outgoing light 032 with a diffraction angle | α |, as shown in fig. 1 b.
The present invention will be described in detail with reference to the PG having the above-mentioned features, but the present invention is not limited to this PG, and the protection is focused on a method for expanding the angle of view based on the PG. The reflection type PG, the asymmetric diffraction angle PG, the liquid crystal adjustable PG and the like are all in the protection scope of the invention, and the application principle is similar, so the independent description is not needed. Based on the polarization diffraction characteristics of PG and the structural characteristics of the integrated imaging three-dimensional display system, the invention provides the following two solutions.
Preferably, solution one is an example of a system based on a conventional backlight, as shown in fig. 2a-2c, in which a two-dimensional display 1 (such as a liquid crystal display or a light emitting diode display) is integrated for displaying an array of elemental images; the polarization controller 2 is used for dynamically controlling the polarization state of the emergent light; a light direction modulation unit 3, such as a Micro-lens Array (MLA) or an equivalent device, for modulating the light direction, and the MLA is taken as an example for explanation; 31 is any one of the microlenses of 3 or equivalent structure; PG 4 and polarization controller 2 cooperate to regulate and control the light deflection angle.
FIG. 2a is a three-dimensional schematic and cross-sectional view of a preferred system configuration; fig. 2b is a cross-sectional view of a second system structure, which is different from fig. 2a only in the relative position relationship between MLA 3 and PG 4, and the working principle is similar, and will not be described again. However, since the light is deflected by PG 4 and then passes through MLA 3, and the large field of view imaging using 31 may cause image quality degradation due to large field aberration, the structure shown in fig. 2a is preferred. Fig. 2c is a cross-sectional view of a third system structure, which is different from the first two operating principles and will be described in detail later.
Preferably, fig. 3a to 3d are schematic diagrams of the first two examples of the first two schemes, where 11 is the area of the lcd 1 displaying any one complete elemental image, 21 is the portion of the polarization controller 2 corresponding to 11, 31 corresponds to 11 and 21, 41 is the portion of PG corresponding to 11, 21 and 31, and 5 is the field angle θ of the conventional integrated imaging system0Reference numeral 61 denotes an LCP optical field emitted through the optical path 41, 62 denotes an RCP optical field emitted through the optical path 41, and 7 denotes an enlarged field angle θ.
For a conventional integrated imaging three-dimensional display system, as shown in fig. 3a, the light emitted by 11 is directly modulated by 31, and the size of the field angle 5 is determined by the pitch of 11 (or 31) and the distance between 11 and 31. The field angle 5 is usually not very large due to a combination of spatial resolution, depth of field and three-dimensional effects. For this reason, PG can be added to the system, and the field angle 5 can be expanded by a space-time multiplexing method without affecting other parameters.
Fig. 3b shows a more ideal system configuration. The 11 displays the time sequence refreshed and coded element image array sequence, the 21 and 11 synchronous refreshing converts the incident light into RCP and LCP light which are changed synchronously with the 11 according to time sequence respectively and then is emitted and enters the 31, the RCP incident light is subjected to direction modulation by the 31 and then is incident into the 41, the 41 integrally generates angle deflection of | α | on the RCP incident light and converts the angle deflection of | α | on the LCP incident light into RCP light 61, and the LCP incident light is integrally subjected to angle deflection of | α | and converts the angle deflection of | α | into RCP light 62. Since the human eye is insensitive to the handedness of circularly polarized light, when the high-speed synchronous refreshing of 11 and 21 satisfies the persistence condition of vision of the human eye, the simultaneous continuous vision of 61 and 62 is formed. In particular, when | α | ═ θ is satisfied0At/2, the adjacent marginal fields of view of 61 and 62 are exactly coincident, and the field angle 7 is expanded to 2 theta0Or 4| α |.
As shown in FIG. 3c, if | α | < θ0The fields of view of/2, 61 and 62 overlap to affect viewing, with the field angle 7 being θ0+2| α |. As shown in FIG. 3d, if | α | > θ 02, then 61 and 62 cannot be spliced to obtain a continuous field of view, where the effective size of field angle 7 is 2 θ0. If the discontinuous field of view is small, the lost part can be processed by using a directional scattering screenLine compensation, the magnitude of the angle of view 7 becomes θ0+2| α |. In particular, if PG 4 or 41 uses liquid crystal or other dynamically tunable PG, and is synchronized with 11 and 21, a non-modulation section 41 can be added to the original timing sequence to transmit the field 5 directly, and to make | α | ═ θ |0Thereby realizing 2 theta0The field of view of (2) is enlarged, and the size of the field of view angle 7 is 3 theta0。
Fig. 4 shows two operating modes of a third example of the solution. The first system configuration is shown in fig. 4a, where 32 and 33 are two adjacent microlenses in the microlens array 3, and 11, 21 and 41 are all located at the center of the line connecting 32 and 33. The basic principle is that the polarization state of a time sequence image displayed by 11 is synchronously modulated by 21 to obtain RCP and LCP light with time sequence change, the RCP and LCP light respectively carries out angle deflection of-alpha | or | alpha | through 41 and then respectively carries out imaging through 32 and 33 to form two visual fields 61 and 62. Similarly, the second system configuration is shown in FIG. 4b, with 31 corresponding to 11, 21 and 41, and 34 and 35 being two microlenses adjacent to 31. The basic principle is that the polarization state of a time sequence image displayed by 11 is synchronously modulated by 21 to obtain RCP and LCP light, the RCP and LCP light respectively undergoes angle deflection of- | alpha | or | alpha | through 41, and then imaging respectively occurs through 34 and 35 to form two fields of view 61 and 62. Meanwhile, if the state that 41 can not be modulated is added in the time sequence, the light emitted by 11 is directly imaged by 31, and three fields of view 61, 5 and 62 are formed. It should be noted that no matter which system configuration is described above, a continuous field of view is not obtained as in the first two examples, and there must be an overlap or discontinuity in the field of view, which is similar to the first two examples and is not separately illustrated. The condition that the view fields are not overlapped is that alpha is more than or equal to theta0And/2, the scattering screen can be used for carrying out certain compensation on the lost field of view.
The second scheme is an example of an integrated imaging three-dimensional display system based on PLSA backlight, as shown in fig. 5, which is a three-dimensional diagram and a cross-sectional diagram of the system structure, wherein 8 is a parallel backlight, and 9 is an integrated liquid crystal modulation panel (without backlight). Similarly, the positions of the microlens arrays 3 and PG 4 can be interchanged, which is similar to the second structure of the first embodiment, and uses the large field imaging of the microlens arrays 3 or 31, but has no principle difference from the illustrated system structure, and thus, the description is omitted.
Fig. 6a-6c are schematic diagrams of the working principle. Where 81 is the portion of the parallel backlight 8 corresponding to 31 and 91 is the portion of the liquid crystal modulation panel 9 corresponding to 31. Likewise, 32 and 33 are two adjacent microlenses in the microlens array 3; 42 and 43 are two adjacent PG areas in PG 4, the centers of which coincide with 32 and 33, respectively; 22 and 23 are adjacent regions in the polarization controller 2, corresponding to 42 and 43, respectively; 82 and 83 are portions of the parallel backlight 8 corresponding to 22 and 23; 92 and 93 are portions of the liquid crystal modulation panel 9 corresponding to the above-described sub-structures.
The working principle of the conventional PLSA backlight-based integrated imaging system is shown in fig. 6a, where parallel light 81 is modulated into divergent spherical wave (when there is no aberration) illumination 91 by 31, and the incident light 91 is subjected to amplitude modulation and then emitted, so that light rays in different directions are loaded with corresponding information. The field angle 5 is determined by the pitch of 81 (or 31) and the focal length of 31, and the field angle 5 is usually not very large due to the combined considerations of spatial resolution, depth of field, and three-dimensional effects. For this reason, PG can be added to the system, and the field angle 5 can be expanded by a space-time multiplexing method without affecting other parameters.
Fig. 6b shows the system configuration and operation principle of the second exemplary embodiment, in which 42 and 43 have the same diffraction angle and opposite magnitudes for incident light with the same polarization state (e.g., the same PG is rotated by 180 °), but 22 and 23 synchronously adjust and control the polarization state of incident light, and the polarization state of emergent light is the same (e.g., a polarization controller). At a certain moment, parallel light is emitted from 82 and 83, incident parallel light is modulated into circularly polarized light (such as RCP light) with the same polarization state by 22 and 23, the circularly polarized light is emitted, modulated into spherical waves by 32 and 33 respectively, then is subjected to-alpha | or | alpha | deflection by 42 and 43 respectively and is converted into LCP light, and finally, two fields of view of 62 and 63 are formed after modulation of 92 and 93 respectively. In practice, the liquid crystal modulation panel 9 may be integrated with a linear polarization controller to convert the incident light into a polarization state that can be modulated by the liquid crystal, and the two fields of view are linearly polarized light with the same polarization state. By periodically arranging the sub-structures shown in the figure, synchronously refreshing 22 and 23 to change the polarization state (the polarization state is the same in real time, and RCP and LCP light are emitted out synchronously according to time sequence), and synchronizing with the time sequence of 92 and 93, an expanded view field can be obtainedAngle 2 theta0。
Fig. 6c shows the system configuration and operation principle of a second example of the scheme, in which 42 and 43 are identical (as adjacent regions of a PG), but 22 and 23 can separately control the polarization state of incident light. At a certain moment, parallel light emitted by the light source 82 is modulated into LCP light through 22, modulated into spherical waves through 32, subjected to angle deflection of | alpha | through 42 and converted into RCP light, and finally modulated through 92 to form a 62-field of view; meanwhile, parallel light emitted by the light source 83 is modulated into RCP light by 23, modulated into spherical waves by 33, subjected to angle deflection of- | alpha | by 43 and converted into LCP light, and finally modulated by 93 to form 63 fields of view, wherein the two fields of view are linearly polarized light with the same polarization state. If 92 and 93 are the same integrated liquid crystal modulator, half of the light energy is lost; if different parameters are used to convert the circularly polarized light into linearly polarized light matched to the liquid crystals in 92 and 93, respectively, loss of light energy can be avoided. By periodically arranging the sub-structures shown in the figure, when the polarization states of the 22 and 23 are refreshed synchronously according to time sequence (the polarization is opposite in real time, and the RCP-LCP and LCP-LCP optical pairs are synchronously emitted according to time sequence), and when the sub-structures are synchronized with the time sequence of 92 and 93, an expanded field angle 2 theta can be obtained0。
The condition that the two structural view fields of the scheme II are not overlapped is that alpha is more than or equal to theta0/2，|α|＞θ0The/2 time can also use the scattering screen to make a certain compensation for the lost field of view.
Scheme two both schemes are realized by two adjacent microlenses, and the field angle can be enlarged by using one microlens for time multiplexing. However, this example is not preferred and will necessarily result in an overlap or separation of the two fields of view, the end result being similar to scheme one, example three and will not be described in detail.
For all the solutions I and II, the condition that the null field overlap is satisfied (| alpha | ≧ theta |)0And/2), in addition to the expansion of the angle of view, the three-dimensional display of two viewing zones formed by two fields of view 61 and 62 (or three viewing zones formed by 61 and 5 and 62) can be realized by changing the encoding method of the element image array of the time-series refresh. The display contents of different visual areas can be the same or differentThe encoding method of the element image array is determined differently.
The present invention has been described in detail only with respect to the case where the one-dimensional angle of view is enlarged. For the expansion of the two-dimensional field angle, only one layer of PG is needed to be added and the refreshing time sequence of the element image array and the polarization controller is needed to be changed correspondingly, the principle is completely consistent with the one-dimensional situation, and the detailed discussion is omitted.
Compared with the prior art, the invention has one or more of the following technical effects:
the structure is simple; full-optical control without complex drive circuit; can be applied to a plurality of scenes.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention, and the features of the embodiments that do not violate each other may be combined with each other. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. An integrated imaging three-dimensional display system field angle expanding method is characterized by comprising the following steps:
arranging a visual angle expanding unit on an integrated imaging three-dimensional display system, wherein the visual angle expanding unit comprises a polarization controller and a polarization grating, and the integrated imaging three-dimensional display system comprises a light direction modulating unit and a display;
expanding a field angle of the integrated imaging three-dimensional display system by using the field angle expansion unit;
the polarization controller dynamically controls the polarization state of emergent light, the display displays an element image array sequence with refreshed time sequence and encoded, the polarization controller and the display synchronously refresh incident light which is respectively converted into dextrorotation circular polarized light and levorotation circular polarized light which are synchronously changed with the display according to the time sequence, the light is emitted into the light direction modulation unit, the light direction modulation unit is incident into the polarization grating after direction modulation, the polarization grating integrally deflects the dextrorotation circular polarized light into levorotation circular polarized light and integrally deflects the levorotation circular polarized light into dextrorotation circular polarized light, and the levorotation circular polarized light is integrally deflected into dextrorotation circular polarized light, so that the expansion of a visual field angle is realized by using a polarization multiplexing and space-time multiplexing method.
2. The integrated imaging three-dimensional display system field angle expansion method according to claim 1, wherein the display comprises a two-dimensional display, the two-dimensional display is a liquid crystal display, a light emitting diode display, or a display with a backlight of a point light source array.
3. The integrated imaging three-dimensional display system field angle expanding method according to claim 2, wherein the polarization controller is disposed on or above the two-dimensional display.
4. The method for expanding the field angle of an integrated imaging three-dimensional display system according to claim 3, wherein the polarization grating is disposed on the light direction modulation unit.
5. The integrated imaging three-dimensional display system field angle expanding method according to any one of claims 2 to 4, wherein the light direction modulating unit comprises a micro lens array.
6. The method of claim 2, wherein the polarization controller is disposed on or above a point light source array backlight of a display having the point light source array backlight.
7. An integrated imaging three-dimensional display system having an expanded field of view, comprising:
a display;
a light direction modulation unit; and
the field angle expanding unit comprises a polarization controller and a polarization grating;
the polarization controller is used for dynamically controlling the polarization state of emergent light, the display is used for displaying a time sequence refreshed element image array sequence which is coded, the polarization controller and the display are refreshed synchronously, incident light is respectively converted into right-handed circularly polarized light and left-handed circularly polarized light which are changed synchronously with the display according to the time sequence, the emergent light enters the light direction modulation unit, the incident light enters the polarization grating after the direction modulation is carried out by the light direction modulation unit, the polarization grating integrally carries out angle deflection on the right-handed circularly polarized light and converts the right-handed circularly polarized light into the left-handed circularly polarized light, and the integral angle deflection of the left-handed circularly polarized light is converted into the right-handed circularly polarized light, so that the field angle is enlarged by using a polarization multiplexing and space-time multiplexing method.
8. The system of claim 7, wherein the display comprises a liquid crystal display, a light emitting diode display, or a display with a backlight of an array of point light sources.
9. The system of claim 8, wherein the polarization controller is disposed on or above the display.
10. The system of claim 9, wherein the polarization grating is disposed on the light direction modulating unit.
11. The system according to any of claims 8-10, wherein said light direction modulating unit comprises a micro lens array.
12. The system of claim 8, wherein the polarization controller is disposed on or above a point light source array backlight of a display having the point light source array backlight.
CN202011238117.5A 2020-11-09 2020-11-09 Method and system for expanding field angle of integrated imaging three-dimensional display system Active CN112305778B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011238117.5A CN112305778B (en) 2020-11-09 2020-11-09 Method and system for expanding field angle of integrated imaging three-dimensional display system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011238117.5A CN112305778B (en) 2020-11-09 2020-11-09 Method and system for expanding field angle of integrated imaging three-dimensional display system

Publications (2)

Publication Number Publication Date
CN112305778A CN112305778A (en) 2021-02-02
CN112305778B true CN112305778B (en) 2022-03-25

Family

ID=74326492

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011238117.5A Active CN112305778B (en) 2020-11-09 2020-11-09 Method and system for expanding field angle of integrated imaging three-dimensional display system

Country Status (1)

Country Link
CN (1) CN112305778B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240036307A1 (en) * 2021-02-08 2024-02-01 Unuversity Of Central Florida Research Foundation, Inc. Optical display system with exit pupil steering

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103869486B (en) * 2014-03-11 2017-01-18 深圳市华星光电技术有限公司 Integrated imaging three-dimensional (3D) display device and system
KR101615828B1 (en) * 2014-12-31 2016-04-27 동서대학교산학협력단 Method to enhance the viewing angle in the integral imaging display system using a mask panel
CN105158919A (en) * 2015-10-30 2015-12-16 成都工业学院 Wide perspective integrated imaging three-dimensional display device based on polarization grating
CN207067548U (en) * 2017-04-11 2018-03-02 成都工业学院 Integration imaging 3D display device based on polarization grating and microlens array
CN207369212U (en) * 2017-05-23 2018-05-15 成都工业学院 Wide viewing angle two dimension integration imaging 3D display device
CN109683338A (en) * 2019-02-21 2019-04-26 京东方科技集团股份有限公司 A kind of light field display device and method
CN110297335B (en) * 2019-07-28 2024-04-05 福州恒美光电材料有限公司 Double-vision 3D display device based on micro-lens array and polarization grating

Also Published As

Publication number Publication date
CN112305778A (en) 2021-02-02

Similar Documents

Publication Publication Date Title
WO2017107313A1 (en) Naked eye 3d laser display device
KR101128519B1 (en) High resolution autostereoscopic display
WO2018086450A1 (en) Waveguide device and three-dimensional display device
WO2017181917A1 (en) Naked-eye 3d display device and method for realizing naked-eye 3d display
CA1331060C (en) Apparatus and method for an electronically controlled color filter for use in information display applications
CN1307481C (en) Optical switching apparatus
CN110133877B (en) Display panel and display device
CN102213899B (en) Projector
US9720246B2 (en) Complex spatial light modulator and 3D image display including the same
WO2019041812A1 (en) Display system and display method
KR20100019447A (en) Method for watching stereoimages with a full resolution at each angle and a device for carrying out said method
TW201641990A (en) Display device, in particular a head-mounted display
CN102231020A (en) Novel three-dimensional display system
JPH06118343A (en) Optical device
KR20030022582A (en) 2D/3D convertible display
CN101109890A (en) Image display apparatus
US11714283B2 (en) Optical apparatus and near-eye display apparatus including the same
TW201611572A (en) Coded illuminator and light field projection device using the same
CN112305778B (en) Method and system for expanding field angle of integrated imaging three-dimensional display system
JP2017003688A (en) Light beam control element and stereoscopic display device
JP2011507047A (en) Controllable light modulator
JP6857197B2 (en) Dynamic full 3D display
CN112835205B (en) Three-dimensional display device
US7804632B2 (en) Display device using 1 dimensional hologram
JP2006058588A (en) Optical device, optical apparatus, display apparatus and stereoscopic image display apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant