CN105892075B - A kind of holographic display system and holographic display methods - Google Patents
A kind of holographic display system and holographic display methods Download PDFInfo
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- CN105892075B CN105892075B CN201610405267.8A CN201610405267A CN105892075B CN 105892075 B CN105892075 B CN 105892075B CN 201610405267 A CN201610405267 A CN 201610405267A CN 105892075 B CN105892075 B CN 105892075B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000011521 glass Substances 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims description 112
- 239000004973 liquid crystal related substance Substances 0.000 claims description 20
- 230000005684 electric field Effects 0.000 claims description 15
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 208000008918 voyeurism Diseases 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000010287 polarization Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 210000004556 brain Anatomy 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 1
- 244000144985 peep Species 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
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Abstract
The invention discloses a kind of holographic display system and holographic display methods, it is related to display technology field, while for providing hologram three-dimensional image information to the user, prevents other staff from obtaining the hologram three-dimensional image information, ensure the safety of user information.The holographic display system includes display device and peep-proof glasses, and the display device includes：For producing the backlight of laser beam；Holographic encoding data for generating holographic encoding data according to hologram three-dimensional image information to be shown, and are divided into the first sub- holographic encoding data and the second sub- holographic encoding data by data processor；First spatial light modulator, including multiple first pixels, for being modulated according to the first sub- holographic encoding data to the laser beam for being incident to each first pixel.The peep-proof glasses include the second space optical modulator being connected with data processor, including multiple second pixels, for being modulated according to the second sub- holographic encoding data to the laser beam for being incident to each second pixel.The present invention is used to provide safe hologram three-dimensional image information to the user.
Description
Technical Field
The invention relates to the technical field of display, in particular to a holographic display system and a holographic display method.
Background
Currently, to improve the viewing experience of a user, a display system is often designed to have a function of providing three-dimensional image information for the user. Specifically, the working process of the display system with the above functions is as follows: the light emitted by the pixel column displaying the left-eye image is projected to the left eye of the observer, and the light emitted by the pixel column displaying the right-eye image is projected to the right eye of the observer, so that the observer can synthesize three-dimensional image information in the brain according to the left-eye image observed by the left eye and the right-eye image observed by the right eye.
However, the inventors of the present application have found that, although the display system can provide the user with the three-dimensional image information, other persons can obtain the three-dimensional image information, and the safety of the user information cannot be ensured.
Disclosure of Invention
The invention aims to provide a holographic display system and a holographic display method, which are used for providing holographic three-dimensional image information for a user, preventing other personnel from obtaining the holographic three-dimensional image information and ensuring the safety of the user information.
In order to achieve the purpose, the holographic display system provided by the invention adopts the following technical scheme:
a holographic display system, the holographic display system comprising a display device and privacy glasses; wherein the display device includes: a backlight for generating a laser beam; the data processor is used for generating holographic coded data according to holographic three-dimensional image information to be displayed and dividing the holographic coded data into first sub-holographic coded data and second sub-holographic coded data; a first spatial light modulator connected to the data processor, the first spatial light modulator including a plurality of first pixels, the first spatial light modulator being configured to modulate a laser beam incident on each of the first pixels according to the first sub-hologram encoded data; the peep-proof glasses comprise: the second spatial light modulator is connected with the data processor, a light incident surface of the second spatial light modulator faces a light emergent surface of the first spatial light modulator, the second spatial light modulator comprises a plurality of second pixels, and the second spatial light modulator is used for modulating the laser beams incident to the second pixels according to the second sub-holographic coded data.
Because the holographic display system provided by the invention comprises the structure, the laser beam emitted by the backlight is emitted into each first pixel in the first spatial light modulator and then is modulated by the first sub-holographic coded data, the laser beam modulated by the first sub-holographic coded data is emitted from the first pixel and then is emitted into the second pixel in the second spatial light modulator and is modulated by the second sub-holographic coded data, so that the laser beam emitted by the second pixel can be modulated by the first sub-holographic coded data and the second sub-holographic coded data respectively, as the first sub-holographic coded data and the second sub-holographic coded data form complete holographic coded data, and the holographic coded data is generated by utilizing holographic three-dimensional image information to be displayed, namely the holographic coded data carries complete holographic three-dimensional image information to be displayed, therefore, when a user wears peep-proof glasses, the holographic display system provided by the invention can provide holographic three-dimensional image information for the user, and other personnel do not wear peep-proof glasses, so that the personnel can only obtain the laser beam emitted by the first pixel.
The invention also provides a holographic display method, which is used for a holographic display system, wherein the holographic display system comprises a display device and peep-proof glasses, the display device comprises a plurality of first pixels, and the peep-proof glasses comprise a plurality of second pixels; the holographic display method comprises the following steps: generating holographic encoding data according to holographic three-dimensional image information to be displayed, and dividing the holographic encoding data into synchronous first sub-holographic encoding data and second sub-holographic encoding data; providing a laser beam to each of the first pixels, modulating the laser beam incident to each of the first pixels according to the first sub-hologram encoded data; and modulating the laser beam incident to each second pixel through each first pixel according to the second sub-holographic encoding data to form holographic three-dimensional image information.
Because the holographic display method provided by the invention comprises the steps, when the laser beam is emitted into each first pixel of the display device, the laser beam is modulated by the first sub-holographic coded data, the laser beam modulated by the first sub-holographic coded data is emitted from the first pixel, emitted into the second pixel of the peep-proof glasses and modulated by the second sub-holographic coded data, so that the laser beam emitted by the second pixel can be modulated by the first sub-holographic coded data and the second sub-holographic coded data respectively, the first sub-holographic coded data and the second sub-holographic coded data form complete holographic coded data, and the holographic coded data is generated by utilizing holographic three-dimensional image information to be displayed, namely the holographic coded data carries the complete holographic three-dimensional image information to be displayed, so that the laser beam emitted by the second pixel carries the complete holographic three-dimensional image information to be displayed, therefore, when a user wears peep-proof glasses, the holographic display method provided by the invention can provide the holographic three-dimensional image information for the user, and other personnel do not wear the peep-proof glasses, so that the personnel can only obtain the laser beam emitted by the first pixel.
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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an optical path of a holographic display system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a first spatial light modulator according to a first embodiment of the present invention;
FIG. 3 is a diagram of a second spatial light modulator according to a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a holographic display system according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of a first spatial light modulator according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram of a second spatial light modulator according to a second embodiment of the present invention;
fig. 7 is a flowchart of a holographic display method in the third embodiment of the present invention.
Description of reference numerals:
1-a display device; 2-peep-proof glasses; 3-backlight;
31-a laser; 32-a beam expander; 4-a lens group;
5-a first spatial light modulator; 51-a first pixel; 6-a data processor;
61-a holographic data generator; 62-a data synchronizer; 7-a second spatial light modulator;
71-a second pixel; 8-a first substrate; 9-a second substrate;
10-a first liquid crystal layer; 11 — a first pixel electrode; 12-a first common electrode;
13-a first driver; 14-a third substrate; 15-a fourth substrate;
16-a second liquid crystal layer; 17-a second pixel electrode; 18-a second common electrode;
19-a first polarizer; 20-a second polarizer; 21-a second driver;
22-a fifth substrate; 23-a sixth substrate; 24-a third liquid crystal layer;
25-a third pixel electrode; 26-a third common electrode; 27-a third polarizer;
28-a third driver; 29-a seventh substrate; 30-an eighth substrate;
31-a fourth liquid crystal layer; 32-a fourth pixel electrode; 33-a fourth common electrode;
34-a fourth polarizer; 35-a fourth drive; 36-a position sensor;
37-a signal receiver; 38-a calculator; 39-controller.
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 some, not all, embodiments of the present invention. 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.
Example one
An embodiment of the present invention provides a holographic display system, as shown in fig. 1, the holographic display system includes a display device 1 and peep-proof glasses 2, and the peep-proof glasses 2 is used in cooperation with the display device 1.
Therein, the display device 1 comprises a backlight 3, a data processor 6 and a first spatial light modulator 5. The backlight 3 is used to generate a laser beam. The data processor 6 is used for generating holographic coded data according to the holographic three-dimensional image information to be displayed, and dividing the holographic coded data into synchronized first sub-holographic coded data and second sub-holographic coded data. The first spatial light modulator 5 is connected to the data processor 6, the first spatial light modulator 5 comprises a plurality of first pixels 51, and the first spatial light modulator 5 is configured to modulate the laser beam incident to each of the first pixels 51 according to the first sub-hologram encoded data.
The peep-proof glasses 2 comprise a second spatial light modulator 7, the second spatial light modulator 7 is connected with the data processor 6, and when a user wears the peep-proof glasses 2 to observe the display device 1, the light incident surface of the second spatial light modulator 7 faces the light emergent surface of the first spatial light modulator 5; the second spatial light modulator 7 includes a plurality of second pixels 71, and the second spatial light modulator 7 is configured to modulate the laser beam incident on each of the second pixels 71 according to the second sub-hologram encoded data.
Because the holographic display system provided by the embodiment of the invention comprises the structure, after the laser beam emitted by the backlight 3 is emitted into each first pixel 51 in the first spatial light modulator 5, the laser beam is modulated by the first sub-holographic coded data, the laser beam modulated by the first sub-holographic coded data is emitted from the first pixel 51, is emitted into the second pixel 71 in the second spatial light modulator 7, and is modulated by the second sub-holographic coded data, so that the laser beam emitted by the second pixel 71 can be modulated by the first sub-holographic coded data and the second sub-holographic coded data respectively, as the first sub-holographic coded data and the second sub-holographic coded data form complete holographic coded data, and the holographic coded data is generated by utilizing holographic three-dimensional image information to be displayed, namely the holographic coded data carries complete holographic three-dimensional image information to be displayed, so that the laser beam emitted by the second pixel 71 carries the complete holographic three-dimensional image information to be displayed, thereby enabling the laser beam to be used for forming the holographic three-dimensional image information, and therefore, when the user wears the peep-proof glasses 2, the holographic display system provided by the embodiment of the invention can provide holographic three-dimensional image information for a user, while others do not wear the peep-proof glasses 2, so that they can only obtain the laser beam emitted by the first pixel 51, since the laser beam emitted by the first pixel 51 is modulated only by the first sub-hologram encoded data, so that the laser beam emitted by the first pixel 51 carries only part of the holographic three-dimensional image information to be displayed, the laser beam cannot be used to form the holographic three-dimensional image information, therefore, other people can be prevented from obtaining the holographic three-dimensional image information, and the safety of user information is ensured.
It should be noted that, in this embodiment, the plurality of first pixels 51 included in the first spatial light modulator 5 and the plurality of second pixels 71 included in the second spatial light modulator 7 preferably correspond to each other one by one, that is, the plurality of first pixels 51 and the plurality of second pixels 71 are equal in number and correspond in position, so that the laser beam emitted from the first pixel 51 can be incident on the corresponding second pixel 71.
In addition, the first sub-hologram encoded data and the second sub-hologram encoded data for modulating a certain laser beam and capable of composing complete hologram encoded data in the present embodiment are preferably synchronized first sub-hologram encoded data and second sub-hologram encoded data.
In addition, the second spatial light modulator 7 may be provided in the right eyeglass frame of the peep-proof glasses 2 to serve as the right eyeglass of the peep-proof glasses 2. Of course, the second spatial light modulator 7 may also be provided in the left eye frame of the privacy glasses 2 to serve as the left eye lens of the privacy glasses 2. Fig. 1 illustrates an example in which the second spatial light modulator 7 is provided in the right frame of the peep-proof spectacles 2.
In this embodiment, the information content carried by the first sub-hologram encoded data and the information content carried by the second sub-hologram encoded data may specifically include the following two cases: in case one, the first sub-hologram encoded data carries phase information, and the second sub-hologram encoded data carries amplitude information; in case two, the first sub-hologram encoded data carries amplitude information and the second sub-hologram encoded data carries phase information.
When the first sub-holographic encoding data carries phase information and the second sub-holographic encoding data carries amplitude information, as shown in fig. 2, the first spatial light modulator 5 includes a first substrate 8 and a second substrate 9 that are disposed opposite to each other, a first liquid crystal layer 10 is disposed between the first substrate 8 and the second substrate 9, and a side of the first substrate 8 facing away from the second substrate 9 or a side of the second substrate 9 facing away from the first substrate 8 is a light incident side of the first spatial light modulator 5; a plurality of first pixel electrodes 11 are disposed on a surface of the first substrate 8 facing the second substrate 9, the first pixel electrodes 11 correspond to the first pixels 51 one by one, and a first common electrode 12 is disposed on a surface of the second substrate 9 facing the first substrate 8.
When the first spatial light modulator 5 having the above-described structure operates, the deflection of the liquid crystal molecules in the first pixel 51 can be controlled by the magnitude V of the electric field formed between the first pixel electrode 11 and the first common electrode 12, so that the angle θ formed by the director direction of the liquid crystal molecules and the wave vector direction of the laser beam incident to the first pixel 51 is changed, that is, θ ═ σ (V). Further, as can be seen from the electrically controlled birefringence effect of the liquid crystal molecules, the phase modulation amount δ of the laser beam incident on the first pixel 51 after passing through the first pixel 51 changes with the change of θ, that is, δ ═ Φ (θ) ═ Φ [ σ (V) ], that is, the phase modulation amount δ of the laser beam incident on the first pixel 51 after passing through the first pixel 51 can be controlled by adjusting the magnitude V of the electric field formed between the first pixel electrode 11 and the first common electrode 12, and since the first pixel electrodes 11 correspond to the first pixels 51 one to one, the phases of the laser beams incident on the respective first pixels 51 can be modulated independently.
Further, as shown in fig. 2, the first spatial light modulator 5 further includes a first driver 13, the data processor 6, the first common electrode 12 and each first pixel electrode 11 are respectively connected to the first driver 13, and the first driver 13 is configured to control a magnitude of an electric field formed between the first common electrode 12 and each first pixel electrode 11 according to the first sub-hologram encoding data carrying the phase information, so that the modulation of the phase of the laser beam incident to each first pixel 51 by the first sub-hologram encoding data carrying the phase information can be achieved.
In addition, as shown in fig. 3, the second spatial light modulator 7 includes a third substrate 14 and a fourth substrate 15 that are oppositely disposed, a second liquid crystal layer 16 is disposed between the third substrate 14 and the fourth substrate 15, and a side of the third substrate 14 facing away from the fourth substrate 15 or a side of the fourth substrate 15 facing away from the third substrate 14 is a light incident side of the second spatial light modulator 7; a plurality of second pixel electrodes 17 are arranged on the surface of the third substrate 14 facing the fourth substrate 15, the second pixel electrodes 17 correspond to the second pixels 71 one by one, and a second common electrode 18 is arranged on the surface of the fourth substrate 15 facing the third substrate 14; a first polarizer 19 is disposed on the surface of the third substrate 14 opposite to the fourth substrate 15, and a second polarizer 20 is disposed on the surface of the fourth substrate 15 opposite to the third substrate 14. If the side of the third substrate 14 facing away from the fourth substrate 15 is the light incident side of the second spatial light modulator 7, the laser beam incident on the second pixel 71 enters from the first polarizer 19 and exits from the second polarizer 20; if the side of the fourth substrate 15 facing away from the third substrate 14 is the light incident side of the second spatial light modulator 7, the laser beam incident on the second pixel 71 enters from the second polarizing plate 20 and exits from the first polarizing plate 19. The embodiment of the present invention will be described by taking an example in which a laser beam incident on the second pixel 71 is incident from the first polarizer 19 and is emitted from the second polarizer 20.
When the second spatial light modulator 7 with the above structure operates, the laser beam incident to the second pixel 71 passes through the first polarizer 19 to form linearly polarized light, and the linearly polarized light passes through the second liquid crystal layer 16 due to the twisting effect of the liquid crystal molecules, and the polarization direction of the linearly polarized light is always consistent with the long axis direction of the liquid crystal molecules. Further, the electric field formed by the second pixel electrode 17 and the second common electrode 18 can control the deflection of the liquid crystal molecules in the second pixel 71, so as to change the arrangement direction of the long axes of the liquid crystal molecules, therefore, when the above-mentioned linearly polarized light reaches the second polarizer 20, the included angle between the polarization direction of the linearly polarized light and the direction of the light transmission axis of the second polarizer 20 can be controlled by the electric field formed by the second pixel electrode 17 and the second common electrode 18, and further the control of the light intensity of the laser beam emitted by the second pixel 71 can be realized, and as the second pixel electrodes 17 and the second pixels 71 are in one-to-one correspondence, the light intensity of the laser beam incident to each second pixel 71 can be independently modulated.
Further, as shown in fig. 3, the second spatial light modulator 7 further includes a second driver 21, the data processor 6, the second common electrode 18 and each second pixel electrode 17 are respectively connected to the second driver 21, and the second driver 21 is configured to control a magnitude of an electric field formed between the second common electrode 18 and each second pixel electrode 17 according to the second sub-hologram encoding data carrying the amplitude information, so that the modulation of the light intensity of the laser beam incident to the second pixel 71 by the second sub-hologram encoding data carrying the amplitude information can be achieved.
It should be noted that the specific structure of the first spatial light modulator 5 and the specific structure of the second spatial light modulator 7 are not limited to the above, and those skilled in the art can make reasonable selections according to actual needs.
In addition, as shown in fig. 1, the backlight 3 may include a laser 31 and a beam expander 32 disposed on the light exit side of the laser 31, so that the diameter and the divergence angle of the laser beam emitted by the laser 31 may be modulated by the beam expander 32, and further, the backlight 3 may provide a uniform laser beam for the first spatial light modulator 5, which may help to improve the display effect of the holographic display system. Illustratively, the laser 31 may be one of a gas laser, a solid laser, a semiconductor laser, and a fuel laser.
Further, the holographic display system provided by the embodiment of the invention can have the following two different working modes: in the first operation mode, the color of the laser beam emitted by the laser 31 is not changed during one frame time of the display device 1, and in this operation mode, the user can observe only one color of the holographic three-dimensional image information during one frame time of the display device 1. For example, when the color of the laser beam emitted by the laser 31 is blue within one frame time of the display device 1, the user can observe only blue holographic three-dimensional image information within one frame time of the display device 1. In the second operation mode, one frame time of the display device 1 includes three time periods, in each of which the color of the laser beam emitted by the laser 31 is one of red, green and blue, and in any two time periods, the color of the laser beam emitted by the laser 31 is different. In this operation mode, the user can obtain the three-dimensional holographic image information of three different colors within one frame time of the display device 1, and the user can synthesize the color three-dimensional holographic image information in the brain according to the three-dimensional holographic image information of three different colors due to the persistence of vision of human eyes.
Further, as shown in fig. 4, the peep preventing glasses 2 may further include a position sensor 36, and the position sensor 36 is configured to detect a spatial position coordinate of the second spatial light modulator 7 with respect to the first spatial light modulator 5. The display device 1 may further include a signal receiver 37, a calculator 38, a controller 39 and a lens assembly 4, wherein the signal receiver 37, the calculator 38, the controller 39 and the lens assembly 4 are sequentially connected, the signal receiver 37 is further connected to a position sensor 36, the lens assembly 4 is disposed on the light-emitting path of the backlight 3 (see fig. 1), and the lenses in the lens assembly 4 are preferably arranged along the propagation direction of the laser beam emitted by the backlight 3; the calculator 38 is configured to perform calculation according to the spatial position coordinates received by the signal receiver 37, and output a calculation result; the controller 39 is configured to control the lens group 4 according to the calculation result, so that the laser beam emitted from the first pixel 51 is incident to the corresponding second pixel 71; the lens group 4 is used for making the laser beam emitted by the first pixel 51 incident on the second pixel 71, and it should be noted that the lens group 4 may be disposed on the light incident side of the first spatial light modulator 5 (as shown in fig. 1), and the lens group 4 may also be disposed on the light emergent side of the first spatial light modulator 5.
When the head of the user moves, the position of the peep-proof glasses 2 worn on the user also moves, so that the position of the second spatial light modulator 7 relative to the first spatial light modulator 5 changes, at this time, the position sensor 36 can detect the spatial position coordinate of the second spatial light modulator 7 relative to the first spatial light modulator 5 and transmit the spatial position coordinate to the signal receiver 37, the calculator 38 is used for calculating according to the spatial position coordinate received by the signal receiver 37 and outputting the calculation result, the controller 39 controls the lens group 4 according to the calculation result, so that the laser beam emitted by the first pixel 51 can be always incident to the corresponding second pixel 71, and therefore, even if the head of the user moves, the holographic display system can provide the holographic three-dimensional image information for the user.
Further, the inventors of the present application have found that when the position of the second spatial light modulator 7 relative to the first spatial light modulator 5 changes, the optical path difference that the laser beam emitted from the first pixel 51 needs to pass through to enter the second pixel 71 also changes, so that there is a certain deviation in the phase of the laser beam entering the second pixel 71, which results in that the holographic three-dimensional image information provided by the holographic display system to the user is not accurate enough. To avoid this problem, as shown in fig. 6, the calculator 38 is further connected to the data processor 6, and the data processor 6 can also perform phase compensation on the second sub-hologram encoded data according to the calculation result output by the calculator 38.
In addition, the specific structure of the data processor 6 can be various, and those skilled in the art can select the structure according to actual needs. Illustratively, as shown in fig. 6, the data processor 6 comprises a holographic data generator 61 and a data synchronizer 62, wherein the holographic data generator 61 is configured to generate holographic encoded data according to holographic three-dimensional image information to be displayed, and divide the holographic encoded data into first sub-holographic encoded data and second sub-holographic encoded data; the data synchronizer 62 is connected to the holographic data generator 61, the first spatial light modulator 5 and the second spatial light modulator 7, respectively, and is configured to perform synchronization processing on the first sub-hologram encoded data and the second sub-hologram encoded data.
Example two
The embodiment of the present invention provides a holographic display system, which is similar to the holographic display system provided in the first embodiment, except that, in the holographic display system provided in the first embodiment, the first sub-holographic encoding data carries amplitude information, and the second sub-holographic encoding data carries phase information, and in response to this situation, as shown in fig. 5, the first spatial light modulator 5 of the display device of the holographic display system in the present embodiment includes a fifth substrate 22 and a sixth substrate 23 that are oppositely disposed, the fifth substrate 22 is disposed on the light incident side of the first spatial light modulator 5, a third liquid crystal layer 24 is disposed between the fifth substrate 22 and the sixth substrate 23, a third polarizer 27 is disposed on a surface of the fifth substrate 22 facing away from the sixth substrate 23, a plurality of third pixel electrodes 25 are disposed on a surface of the fifth substrate 22 facing the sixth substrate 23, the third pixel electrodes 25 correspond to the first pixels 51 one by one, and a third common electrode 26 is disposed on a surface of the sixth substrate 23 facing the fifth substrate 22. When the first spatial light modulator 5 with the above structure operates, the laser beam incident to the first pixels 51 forms linearly polarized light after passing through the third polarizer 27, the polarization direction of the linearly polarized light can be controlled by the electric field formed between the third pixel electrode 25 and the third common electrode 26, and the polarization directions of the laser beam incident to the respective first pixels 51 can be independently modulated due to the one-to-one correspondence between the third pixel electrode 25 and the first pixels 51.
Further, as shown in fig. 5, the first spatial light modulator 5 further includes a third driver 28, where the third driver 28 is respectively connected to the data processor 6, the third common electrode 26 and each third pixel electrode 25, and is configured to control a magnitude of an electric field formed between the third common electrode 26 and each third pixel electrode 25 according to the first sub-hologram encoding data carrying the amplitude information, so that the first sub-hologram encoding data carrying the amplitude information can modulate a polarization direction of the laser beam incident to each first pixel 51.
Further, as shown in fig. 6, the second spatial light modulator 7 of the peep-proof glasses of the holographic display system in the present embodiment includes a seventh substrate 29 and an eighth substrate 30 which are oppositely disposed, the seventh substrate 29 is disposed on the light incident side of the second spatial light modulator 7, a fourth liquid crystal layer 31 is disposed between the seventh substrate 29 and the eighth substrate 30, a fourth polarizer 34 is disposed on a surface of the seventh substrate 29 facing away from the eighth substrate 30, a plurality of fourth pixel electrodes 32 are disposed on a surface of the seventh substrate 29 facing the eighth substrate 30, the fourth pixel electrodes 32 are in one-to-one correspondence with the second pixels 71, and a fourth common electrode 33 is disposed on a surface of the eighth substrate 30 facing the seventh substrate 29.
When the second spatial light modulator 7 with the above structure operates, it can be known from the above analysis that the laser beam incident to the first pixel 51 forms linearly polarized light after passing through the third polarizer 27, so that the laser beam emitted by the first pixel 51 is linearly polarized light, and the laser beam incident to the second pixel 71 is a laser beam emitted by the first pixel 51 corresponding to the laser beam incident to the second pixel 71, so that the laser beam incident to the second pixel 71 is also linearly polarized light, and the electric field formed between the third pixel electrode 25 and the third common electrode 26 can control the polarization direction of the linearly polarized light, so that the included angle formed by the polarization direction of the linearly polarized light and the direction of the transmission axis of the fourth polarizer 34 can be controlled, and further the light intensity of the laser beam incident to the second pixel 71 can be modulated. Further, the phase modulation amount of the laser beam incident to the second pixels 71 after passing through the second pixels 71 can be controlled by the electric field formed by the fourth pixel electrode 32 and the fourth common electrode 33, and since the fourth pixel electrode 32 and the second pixels 71 correspond one to one, the phases of the laser beams incident to the respective second pixels 71 can be independently modulated.
Further, as shown in fig. 6, the second spatial light modulator 7 further includes a fourth driver 35, and the fourth driver 35 is respectively connected to the data processor 6, the fourth common electrode 33 and each fourth pixel electrode 32, and is configured to control a magnitude of an electric field formed between the fourth common electrode 33 and each fourth pixel electrode 32 according to the second sub-hologram encoding data carrying the phase information, so that modulation of the phase of the laser beam incident to each second pixel 71 by the second sub-hologram encoding data carrying the phase information can be achieved.
It should be noted that the specific structure of the first spatial light modulator 5 and the specific structure of the second spatial light modulator 7 are not limited to the above, and those skilled in the art can make reasonable selections according to actual needs.
EXAMPLE III
The embodiment of the invention provides a holographic display method, which is used for a holographic display system. The holographic display system includes a display device including a plurality of first pixels and privacy glasses including a plurality of second pixels. As shown in fig. 7, the holographic display method includes the steps of:
step S101: generating holographic encoding data according to holographic three-dimensional image information to be displayed, and dividing the holographic encoding data into synchronous first sub-holographic encoding data and second sub-holographic encoding data.
Step S102: and providing a laser beam to each of the first pixels, and modulating the laser beam incident to each of the first pixels according to the first sub-hologram encoded data.
Step S103: and modulating the laser beam incident to each second pixel through each first pixel according to the second sub-holographic encoding data to form holographic three-dimensional image information.
Because the holographic display method provided by the embodiment of the invention comprises the above steps, when a laser beam enters each first pixel 51 of the display device, the laser beam is modulated by the first sub-holographic coded data, the laser beam modulated by the first sub-holographic coded data is emitted from the first pixel 51, is emitted into the second pixel 71 of the peep-proof glasses, and is modulated by the second sub-holographic coded data, so that the laser beam emitted by the second pixel 71 can be modulated by the first sub-holographic coded data and the second sub-holographic coded data respectively, because the first sub-holographic coded data and the second sub-holographic coded data form complete holographic coded data, and the holographic coded data is generated by utilizing holographic three-dimensional image information to be displayed, namely the holographic coded data carries complete holographic three-dimensional image information to be displayed, the laser beam emitted by the second pixel 71 carries the complete holographic three-dimensional image information to be displayed, therefore, when the user wears the peep-proof glasses 2, the holographic display system provided by the embodiment of the invention can provide the holographic three-dimensional image information for the user, and other persons do not wear the peep-proof glasses 2, so that the persons can only obtain the laser beam emitted by the first pixel 51, and the laser beam emitted by the first pixel 51 is only modulated by the first sub-holographic coded data, so that the laser beam emitted by the first pixel 51 only carries part of the holographic three-dimensional image information to be displayed, and the laser beam cannot be used for forming the holographic three-dimensional image information, thereby preventing other persons from obtaining the holographic three-dimensional image information, and ensuring the safety of the user information.
The holographic display method described above can be applied to the holographic display systems as described in the first and second embodiments. When the holographic display method is applied to the holographic display system according to the first embodiment and the second embodiment, with reference to fig. 1, the steps of the holographic display method are specifically as follows:
step S101: the data processor 6 of the holographic display system generates holographic encoding data according to the holographic three-dimensional image information to be displayed, and divides the holographic encoding data into synchronous first sub-holographic encoding data and second sub-holographic encoding data.
Step S102: the backlight 3 of the holographic display system supplies a laser beam to each first pixel 51 of the first spatial light modulator 5 of the holographic display system, and the first spatial light modulator 5 modulates the laser beam incident to each first pixel 51 according to the first sub-hologram encoded data.
Step S103: the second spatial light modulator 7 of the holographic display system modulates the laser beam incident to each of the second pixels 71 of the second spatial light modulator 7 according to the second sub-hologram encoding data to form holographic three-dimensional image information.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (17)
1. A holographic display system, comprising a display device and anti-peeping glasses; wherein,
the display device includes: a backlight for generating a laser beam; the data processor is used for generating holographic coded data according to holographic three-dimensional image information to be displayed and dividing the holographic coded data into first sub-holographic coded data and second sub-holographic coded data; a first spatial light modulator connected to the data processor, the first spatial light modulator including a plurality of first pixels, the first spatial light modulator being configured to modulate a laser beam incident on each of the first pixels according to the first sub-hologram encoded data;
the peep-proof glasses comprise: the second spatial light modulator is connected with the data processor, a light incident surface of the second spatial light modulator faces a light emergent surface of the first spatial light modulator, the second spatial light modulator comprises a plurality of second pixels, and the second spatial light modulator is used for modulating the laser beams incident to the second pixels according to the second sub-holographic coded data.
2. The holographic display system of claim 1, in which a plurality of first pixels included in the first spatial light modulator are in one-to-one correspondence with a plurality of second pixels included in the second spatial light modulator.
3. The holographic display system of claim 1 or 2, in which the first sub-holographic encoding data carries phase information and the second sub-holographic encoding data carries amplitude information, the first spatial light modulator comprises a first substrate and a second substrate which are oppositely arranged, a first liquid crystal layer is arranged between the first substrate and the second substrate, and a side of the first substrate facing away from the second substrate or a side of the second substrate facing away from the first substrate is a light incident side of the first spatial light modulator; the surface of the first substrate facing the second substrate is provided with a plurality of first pixel electrodes, the first pixel electrodes correspond to the first pixels one by one, and the surface of the second substrate facing the first substrate is provided with a first common electrode.
4. The holographic display system of claim 3, in which the first spatial light modulator further comprises a first driver, the data processor, the first common electrode and each of the first pixel electrodes are respectively connected to the first driver, and the first driver is configured to control a magnitude of an electric field formed between the first common electrode and each of the first pixel electrodes according to the first sub-holographic encoded data carrying the phase information.
5. The holographic display system of claim 3, in which the second spatial light modulator comprises a third substrate and a fourth substrate that are oppositely disposed, a second liquid crystal layer is disposed between the third substrate and the fourth substrate, and a side of the third substrate facing away from the fourth substrate or a side of the fourth substrate facing away from the third substrate is a light incident side of the second spatial light modulator; a plurality of second pixel electrodes are arranged on the surface, facing the fourth substrate, of the third substrate, the second pixel electrodes correspond to the second pixels one by one, and a second common electrode is arranged on the surface, facing the third substrate, of the fourth substrate; and a first polaroid is arranged on the surface of the third substrate, which faces away from the fourth substrate, and a second polaroid is arranged on the surface of the fourth substrate, which faces away from the third substrate.
6. The holographic display system of claim 5, in which the second spatial light modulator further comprises a second driver, the data processor, the second common electrode and each of the second pixel electrodes are respectively connected to the second driver, and the second driver is configured to control a magnitude of an electric field formed between the second common electrode and each of the second pixel electrodes according to the second sub-holographic encoding data carrying the amplitude information.
7. The holographic display system of claim 1 or 2, wherein the first sub-holographic encoding data carries amplitude information and the second sub-holographic encoding data carries phase information, the first spatial light modulator comprises a fifth substrate and a sixth substrate which are oppositely arranged, the fifth substrate is arranged on a light incident side of the first spatial light modulator, a third liquid crystal layer is arranged between the fifth substrate and the sixth substrate, a third polarizer is arranged on a surface of the fifth substrate, which faces away from the sixth substrate, a plurality of third pixel electrodes are arranged on a surface of the fifth substrate, which faces the sixth substrate, the third pixel electrodes correspond to the first pixels in a one-to-one manner, and a third common electrode is arranged on a surface of the sixth substrate, which faces the fifth substrate.
8. The holographic display system of claim 7, in which the first spatial light modulator further comprises a third driver, the data processor, the third common electrode and each of the third pixel electrodes are respectively connected to the third driver, and the third driver is configured to control a magnitude of an electric field formed between the third common electrode and each of the third pixel electrodes according to the first sub-holographic encoding data carrying the amplitude information.
9. The holographic display system according to claim 7, wherein the second spatial light modulator includes a seventh substrate and an eighth substrate which are oppositely disposed, the seventh substrate is disposed on a light incident side of the second spatial light modulator, a fourth liquid crystal layer is disposed between the seventh substrate and the eighth substrate, a fourth polarizer is disposed on a surface of the seventh substrate facing away from the eighth substrate, a plurality of fourth pixel electrodes are disposed on a surface of the seventh substrate facing the eighth substrate, the fourth pixel electrodes are in one-to-one correspondence with the second pixels, and a fourth common electrode is disposed on a surface of the eighth substrate facing the seventh substrate.
10. The holographic display system of claim 9, in which the second spatial light modulator further comprises a fourth driver, the data processor, the fourth common electrode and each of the fourth pixel electrodes are respectively connected to the fourth driver, and the fourth driver is configured to control a magnitude of an electric field formed between the fourth common electrode and each of the fourth pixel electrodes according to the second sub-holographic encoded data carrying the phase information.
11. The holographic display of claim 1 or 2, in which the backlight comprises a laser and a beam expander disposed at an exit side of the laser.
12. The holographic display of claim 11, in which a laser beam emitted by the laser does not change color within a frame time of the display device.
13. The holographic display of claim 11, in which a frame time of the display device includes three time periods, in each of which the laser beam emitted by the laser is one of red, green and blue, and in any two of which the laser beam emitted by the laser is of a different color.
14. The holographic display system of claim 1 or 2, in which the privacy glasses further comprise a position sensor for detecting spatial position coordinates of the second spatial light modulator relative to the first spatial light modulator;
the display device further comprises a signal receiver, a calculator, a controller and a lens group, wherein the signal receiver, the calculator, the controller and the lens group are sequentially connected, the signal receiver is further connected with the position sensor, and the lens group is arranged on a light-emitting path of the backlight; the calculator is used for calculating according to the space position coordinates received by the signal receiver and outputting a calculation result; the controller is used for controlling the lens group according to the calculation result so that the laser beam emitted by the first pixel is incident into the second pixel.
15. The holographic display system of claim 14, in which the calculator is further coupled to the data processor, the data processor being further configured to perform phase compensation on the second sub-holographic encoded data based on the calculation.
16. Holographic display system of claim 1 or 2, in which the data processor comprises a holographic data generator and a data synchronizer, wherein,
the holographic data generator is used for generating the holographic coded data according to the holographic three-dimensional image information to be displayed and dividing the holographic coded data into the first sub holographic coded data and the second sub holographic coded data;
the holographic data generator, the first spatial light modulator and the second spatial light modulator are respectively connected with the data synchronizer, and the data synchronizer is used for synchronously processing the first sub-holographic coded data and the second sub-holographic coded data.
17. A holographic display method, wherein the holographic display method is used in a holographic display system, the holographic display system comprises a display device and privacy glasses, the display device comprises a backlight, a data processor, a first spatial light modulator and a plurality of first pixels, and the privacy glasses comprise a second spatial light modulator and a plurality of second pixels; the holographic display method comprises the following steps:
the data processor generates holographic coded data according to holographic three-dimensional image information to be displayed, and divides the holographic coded data into synchronous first sub-holographic coded data and second sub-holographic coded data;
the backlight provides a laser beam to each first pixel of the first spatial light modulator, and the first spatial light modulator modulates the laser beam incident to each first pixel according to the first sub-hologram encoding data;
and the second spatial light modulator modulates the laser beam incident to each second pixel through each first pixel according to the second sub-holographic encoding data to form holographic three-dimensional image information.
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| CN106210707B (en) | 2016-09-14 | 2018-05-01 | 京东方科技集团股份有限公司 | A kind of holographic display system and holographic display methods |
| CN107462999B (en) * | 2017-08-01 | 2020-12-22 | 北京理工大学 | Color large-size three-dimensional dynamic holographic display device based on double-layer liquid crystal modulation |
| CN110303256A (en) * | 2019-07-01 | 2019-10-08 | 东莞市德普特电子有限公司 | A kind of laser special-shaped processing technology of polaroid |
| CN110426941B (en) * | 2019-08-08 | 2021-05-11 | 中国联合网络通信集团有限公司 | Peep-proof method and device for holographic projection image |
| CN115202176A (en) * | 2021-04-12 | 2022-10-18 | 京东方科技集团股份有限公司 | Display device and holographic display apparatus |
| CN113267909B (en) * | 2021-07-19 | 2021-10-08 | 军事科学院系统工程研究院网络信息研究所 | Peep-proof display method based on wave front distortion compensation |
| CN114660916A (en) * | 2022-03-16 | 2022-06-24 | 李�杰 | Multi-angle holographic image display system and method |
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