CN106556966B - A kind of ultraphotic angle direction projection screen of the dot structure containing nanometer grating - Google Patents
A kind of ultraphotic angle direction projection screen of the dot structure containing nanometer grating Download PDFInfo
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a kind of ultraphotic angles of dot structure containing nanometer grating to be directed toward projection screen comprising at least one is directed toward screen, and the light-emitting surface for being directed toward screen is equipped with multiple groups pixel array, is directed toward same visual angle with the light that the pixel organized in pixel array issues.Direction projection screen containing nanometer grating in conjunction with display technology, is realized ultraphotic angle naked eye 3D display by the present invention.
Description
Technical field
The present invention relates to naked eye 3D display fields, and in particular to a kind of ultraphotic angle direction throwing of the dot structure containing nanometer grating
Shadow screen.
Background technique
Hologram is a kind of image for carrying amplitude and phase information, and it is tired not generate vision for energy true reappearance three-dimensional information
Labor, stereoscopic effect are unrelated at a distance from observer.The principle of holography display can be summarized as: hologram can be three-dimensional empty in spatial reproduction
As or three-dimensional real image, the every bit on hologram transmitting information to space all directions, each point of observation in space
It can be seen that the image of whole picture.In other words, image information is focused on point of observation by light field transmission.Therefore, in space difference
Point of observation, it should be seen that the entire image of different perspectives, does not interfere with each other mutually.But for decades, by hologram recording material, letter
The limitation of breath amount and technical matters, holography display fail the mainstream as naked eye 3D display.
Principle of parallax invention more than 100 years, although enterprise constantly has the model machine of 3D display to show both at home and abroad, due to image
The limitation of the problems such as resolution ratio and visual fatigue, naked eye 3D display fail to actually enter consumer field always.
Traditional multi-view angle three-dimensional shows based on geometric optical theory have cylindrical lens array and projected array method, however hold
Be also easy to produce influx adjust contradiction, make human eye viewing it is unnatural, such as patent CN20101058659.4 (switchable display modes
LED naked-eye display device) it proposes to realize that 2D/3D switches using flexible slit grating, but its display effect is influenced by viewing location
It is larger.Ultraphotic angle naked eye 3D display technology can weaken influx and adjust contradiction, realize more natural view transformation process.It is based on
The ultraphotic angle 3 D displaying method light control accuracy of cylindrical lens array is poor, is also easy to produce interference, projected array method structure is very multiple
Miscellaneous, volume is larger, is not suitable for the display terminal of portable.Therefore the method for a more reasonable Three-dimensional Display is needed to solve
Problems above.
Ultraphotic angle naked eye 3D display is based on the improvement on the basis of multi-angle of view naked eye 3D.Its it is main difference be, ultraphotic
Angle Three-dimensional Display shortens the distance between two neighboring visual angle, and the one eye eyeball of people is allow to see more than two views simultaneously
Angle.Therefore, human eye is observed that continuous parallax, ensure that the Three-dimensional Display effect of image.In common naked eye 3D display
In technology, simple eye focussing distance polymerize distance with eyes and mismatches, and is easy to make eye fatigue, after the method using ultraphotic angle,
Can achievement solve influx and adjust contradiction, it is ornamental to be more suitable for human eye.
Ultraphotic angle 3D display technology based on diffraction optics is a kind of good ultraphotic angle 3 D displaying method, uses and receives
Rice optical grating construction controls each visual angle, and light control accuracy is high, and is not likely to produce crosstalk, and structure is simple, small volume, fit
Preferably it is used as portable display terminal.It is the effective ways for guaranteeing 3D display effect.
Existing naked eye 3D display scheme disadvantage is that parallax is discontinuous, influences 3D display effect.Meanwhile multi-angle of view at present
In naked eye 3D display, simple eye focussing distance polymerize distance with eyes and mismatches, and generates influx and adjusts contradiction, is easy to keep eye tired
Labor.
Summary of the invention
It is directed toward and throws in order to solve the above-mentioned technical problems, the present invention provides a kind of ultraphotic angle of dot structure containing nanometer grating
Shadow screen realizes ultraphotic angle naked eye 3D display by the direction projection screen containing nanometer grating in conjunction with display technology.
In order to achieve the above object, technical scheme is as follows:
A kind of ultraphotic angle direction projection screen of the dot structure containing nanometer grating comprising at least one is directed toward screen, refers to
It is equipped with multiple groups pixel array to the light-emitting surface of screen, is directed toward same visual angle with the light that the pixel organized in pixel array issues.It is logical
Reduction is crossed with nanometer grating periodic inequality in group pixel array, thus the distance between reducing adjacent view.
Further, distance is less than pupil size between above-mentioned adjacent view, when distance is less than pupil size between adjacent view
When further according to grating equation find out periodic inequality.
Further, respective pixel array is fitted into mutually according to holographic imaging principle between above-mentioned each group pixel array,
It is distributed on the light-emitting surface for being directed toward screen.The pixel array of difference group has the convergence viewpoint of different positions, collectively constitutes super
The distribution of visual angle viewpoint.
Further, the period of nanometer grating, the mutual relationship of orientation meet principle of holography inside above-mentioned pixel.
Further, the behind or front of above-mentioned direction screen are set there are three monochromatic point light source, the light that point light source issues
It is incident on the behind for being directed toward screen from top to down or from below to up.
Further, after screen is directed toward in above-mentioned point light source diffused illumination, by the pixel of multi-angle of view composograph and it is directed toward screen
Nanometer grating pixel on curtain is corresponding, after the propagation of space length, forms the optical output field of different points of view, multiple views light field
Form ultraphotic.
Further, above three monochrome is red, green and blue.
Further, the incident angle of above three monochrome point light source and the relationship of wavelength meet optical grating diffraction equation.This
Projection screen is directed toward at the ultraphotic angle for inventing a kind of dot structure containing nanometer grating proposed, and the direction containing nanometer grating is projected
Screen realizes ultraphotic angle naked eye 3D display in conjunction with display technology.The advantages of invention is, first, the image of observation is in sky
Between there is in viewpoint convergence effect, while carrying amplitude and phase information, crosstalk be not present between different perspectives image.Second, benefit
Regulate and control each visual angle with nanometer grating, makes an eyes it can be seen that more than two visual angles, realize continuous parallax, guarantee is certainly
Right Three-dimensional Display effect.Third makes simple eye focussing distance polymerize distance matching with eyes, reduces eye strain.4th, it uses
LCD cooperates the refreshing of image, realizes that naked eye 3D video in ultraphotic angle is shown.Therefore, the present invention is with nanometer grating projection screen to out
It penetrates light direction to be regulated and controled, for cooperation LCD display technology, it can be achieved that ultraphotic angle naked eye 3D display, obtained image resolution ratio is high, subtracts
Small crosstalk guarantees the continuity of parallax, reduces influx and adjusts contradiction, makes viewing effect more naturally, guaranteeing 3D display effect.
Detailed description of the invention
Fig. 1 is human eyes structure figure involved in the embodiment of the present invention.
Fig. 2 is cone cell distribution map involved in the embodiment of the present invention.
Fig. 3 and Fig. 4 be the embodiment of the present invention in structure dimension Nano grade diffraction grating in X/Y plane and XZ plane
Under structure chart.
Fig. 5 is a variety of nanometer grating dot structure schematic diagrames in the embodiment of the present invention.
Fig. 6 is the nanostructure distribution map of the directive property function film of existing single viewpoint convergence in the embodiment of the present invention.
Fig. 7 is a kind of ultraphotic angle displaying scheme figure in the embodiment of the present invention.
Fig. 8 is display screen structure schematic diagram in the embodiment of the present invention.
Fig. 9 is display screen structure schematic diagram in the naked eye 3D display of colored ultraphotic angle in the embodiment of the present invention.
Figure 10 a-b is that light source illuminates schematic diagram in the embodiment of the present invention.
Figure 11 a-c is two visual angle pixel density distribution maps of multi-angle of view naked eye 3D display in the embodiment of the present invention.
Figure 12 is that directional light reproduces coordinate system schematic diagram involved in null tone calculating in the embodiment of the present invention.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Projection screen is directed toward at the ultraphotic angle that the present embodiment essentially describes a kind of dot structure containing nanometer grating, uses liquid crystal
Show that device laminating type provides multi-view image, corresponding with nanostructure pixel array on screen, each width multi-view image is by one
Group nanostructure pixel array generates on screen periphery space assembles light field (viewpoint), and the eyes of people is made to can see two
A above viewpoint, the parallax distribution between two neighboring viewpoint is as continuous as possible, makes the three-dimensional sense of image closer to truth.
It, will be from each multi-view image of projection the technical scheme is that by the direction screen containing nanometer grating pixel
It converges near projection arrangement position, the viewpoint being closer is generated in space, realize monocular parallax effect.Ultraphotic angle screen
Pixel includes the sub-pix corresponding to each multi-view image, and sub-pix contains the nanometer grating combination according to principle of holography design,
The function of its nanometer grating pixel array is to carry out wave-front conversion to incident multi-view image, by parallel or dotted illumination light field,
Form the convergence viewpoint within adjacent pupil (2mm) size.Substantially, this is holographic wave-front conversion imaging, the view that LCD is provided
Angle information is transformed into a phase viewpoint, since visual angle interval is less than pupil diameter size, monocular parallax effect is realized, to subtract
Small influx adjusts contradiction, ensure that parallax distribution in adjacent view intermediate area is continuous, enhances 3D display effect.
Purpose according to the present invention, a kind of ultraphotic angle 3D display device of proposition, including at least one direction screen.It is described
The light-emitting surface for being directed toward screen is equipped with multiple groups pixel array, according to holographic imaging principle by respective pixel between each group pixel array
Array is fitted into mutually, is distributed on the light-emitting surface for being directed toward screen.It is directed toward with the light that the pixel in group pixel array issues same
One visual angle reduces the distance between adjacent view, single eyes is enable to see multiple visual angles simultaneously；The pixel array tool of difference group
There is the convergence viewpoint of different positions, collectively constitutes the distribution of ultraphotic angle viewpoint.Wherein, contain nanometer grating knot inside the pixel
Structure, the period of pixel inside nanometer grating, the mutual relationship of orientation meet principle of holography.
The behind (or front) for being directed toward screen is set there are three monochromatic (red, green, blue) point light source, what light source issued
Light is incident on the behind for being directed toward screen from top to down (or from below to up).Direction is fitted in using by liquid crystal display (LCD)
Above screen, multi-angle of view plane composograph is provided by LCD, after screen is directed toward in point light source diffused illumination, by multi-angle of view composite diagram
The pixel of picture is corresponding with the nanometer grating pixel being directed toward on screen, after the propagation of space length, forms going out for different points of view
Light field is penetrated, multiple views light field forms ultraphotic angle, and image, without crosstalk, when the observation of human eye transverse shifting, light distribution is uniform, nothing
Shadow, it is seen that 3D stereoscopic effect true to nature.
Here, it is directed toward screen and provides spatial information (position phase) modulation, liquid crystal display provides the (vibration of multi-view image information
Width) it modulates, the two combines, and has all information of holographic display.The pixel array being made of nanometer grating, is substantially played
The effect of wavefront transform imaging.The wavefront with convergence function, corresponding different perspectives figure will be converted into screen multi-view image
Picture forms separation viewpoint (directive property light field) in space, since the position phase (visual angle) and amplitude (image) that carry before space wave are believed
The independent propagation of breath, mutually not crosstalk between each wavefront (viewpoint).When eye-observation, visual fatigue, the three-dimensional effect of observation will not be generated
Fruit is unrelated with the position of observer.
The pixel of the multi-view image of liquid crystal display must be aligned with the nanometer grating pixel matching for being directed toward projection screen.
Referring to attached drawing 1 and attached drawing 2, attached drawing 1 is human eyes structure figure.The eyes approximate spheres of people, have the function of optical imagery
Tissue be cornea and crystalline lens.Retina is located at eyes rear end, is the first stop for the nerve information transmitting that vision is formed.View
The primary photosensitive neuron that cone cell on film is, in optical axis face terminal.Attached drawing 2 is cone cell distribution map, can by figure
To know, cone cell distributed pole is uneven, and it is most intensive at central fovea of macula, it is distributed on a small quantity in retina other positions.Therefore, in
The recessed heart is the most sharp region of vision, and diameter is about 1~3mm.The visual field of human eye can be observed clearly simultaneously up to 150 °
The range of object is only 6 °~8 ° around the optical axis.The present invention will fully consider cone cell characteristic distributions, design each visual angle pixel
Distribution reaches visual experience optimization.
The present invention constructs new light field using the nanostructure based on diffraction effect.Single nanostructure and light interact,
Change its phase.Referring to attached drawing 3 and attached drawing 4, attached drawing 3 and attached drawing 4 are that structure dimension is flat in XY in the diffraction grating of Nano grade
Structure chart under face and XZ plane.According to grating equation, the period of diffraction grating pixel 101, the angle of orientation meet following relationship:
(1)
(2)
Wherein, light is incident on X/Y plane, 1 He of θ at an angleSuccessively indicate that the angle of diffraction of diffraction light 202 (is spread out
Penetrate light and z-axis positive direction angle) and diffraction light 202 azimuth (diffracted ray and positive direction of the x-axis angle), θ and λ successively table
Show the incidence angle (incident ray and z-axis positive direction angle) and wavelength of light source 201,WithSuccessively indicate nanometer diffraction grating
101 period and the angle of orientation (groove profile direction and positive direction of the y-axis angle), n indicate the refractive index of light wave in the medium.In other words,
After providing incident ray wavelength, incidence angle and the diffracted ray angle of diffraction and diffraction azimuth, so that it may by above-mentioned
Two formula calculate period and the angle of orientation of required nanometer grating.For example, 650nm wavelength feux rouges is with 60 ° of angle incidences, light
The angle of diffraction be 10 °, diffraction azimuth is 45 °, by calculate, the corresponding nanometer diffraction grating period be 550nm, the angle of orientation
It is -5.96 °.
According to above-mentioned principle, each nanometer grating is considered as a pixel.The orientation of the grating determines light field angle
Modulating characteristic, period determine spectral filtering characteristic.The period (null tone) of nanostructure and orientation are in each sub- picture in this method
Variation between element is continuous, and the regulation and transformation of light field can be realized.Therefore, it is produced on nanostructure directive property phase-plate
After the nanometer grating at multiple different orientation angles and period set on demand, it is theoretically obtained with enough differences of having
Viewpoint, the control of distance between cooperation color, gray scale and each viewpoint can real ultraphotic angle naked eye 3D display.
Referring to attached drawing 5, attached drawing 5 is a variety of nanometer grating dot structure schematic diagrames.Optical grating construction can be made of single material,
Also it can be made of a variety of materials.It can be on directive property functional lens surface, also inside embeddable directive property functional lens.Its essence is
Light refractive index micro-nano-scale space periodically variation and can with light action generation diffraction effect, it is proposed by the present invention on
State directive property functional lens, wherein nanometer grating pixel can using ultraviolet continuous emptying frequency photoetching technique and nano impression into
Row production, the ultraviolet continuous emptying frequency photoetching technique is referring to application No. is the records of the Chinese patent application of CN201310166341.1
Lithographic equipment and photolithography method.It should be pointed out that in the present invention, can be etched and be made in smooth surface using photolithography method
Each nanometer grating being differently directed is made, then makes the template that can be used in coining, is then imprinted by nano impression batch
The pixel array of nanometer optical grating constitution out.
Referring to attached drawing 6, attached drawing 6 is the nanostructure distribution map for realizing the directive property function film of single viewpoint convergence.It is excellent
Selection of land, nanostructure are equivalent to single off-axis Fresnel lens structure, image can be made to converge at viewpoint 1.N × m sub- pictures
Element constitutes the off-axis Fresnel lens structure of n × m different focal point.In addition, by design single pixel complexity nanostructure,
Emergent ray can be made insensitive to lambda1-wavelength, i.e., by gradual change nanostructure, multi-wavelength incident light can be made to obtain identical meeting
Poly- effect.Pixel is not limited to rectangular pixels on figure, is also possible to circle, diamond shape, the pixels structure composition such as hexagon.Pixel on figure
Also can mutually discrete, appropriately designed pel spacing, can be allowed to meet illumination gap require.In addition, scheming upper each pixel by adjusting
The structural parameters such as pixel size, structure or groove depth according to changes in spatial distribution, each pixel can be made to obtain ideal diffraction efficiency,
Achieve the purpose that Uniform Illumination.
Referring to attached drawing 7, Fig. 7 is a kind of ultraphotic angle displaying scheme figure under embodiment of the present invention.The displaying scheme passes through
Display screen by each multi-view image separation converge near screen, visual angle spacing be less than pupil of human size, make one it is simple eye can
It sees the above multi-view image of two width (visual angle 1 and visual angle 2), is focused on retina and be imaged by human lens, simple eye focusing
Position be located at display three-dimension object on (position 1), simple eye focusing function may be implemented in this way.Display screen structure on Fig. 7
As shown in figure 8, including at least one layer of directive property projection screen, liquid crystal display panel and a light source.Project to directive property projection screen
Light on curtain modulates outgoing, several multi-view images that will be shown in liquid crystal surface by the nanometer grating on directive property projection screen
Separation forms the distribution of space different perspectives, and single visual angle can form convergence function, corresponding single visual angle nanometer grating structure
As shown in fig. 6, different perspectives nanometer grating pixel is fitted into mutually, it is distributed on the light-emitting surface for being directed toward screen, as shown in Figure 8
The corresponding nanometer grating pixel in three visual angles, while each visual angle on the nanometer grating pixel at each visual angle and LCD screen are gone out
Image pixel aligns, and avoids that visual angle crosstalk occurs.
It is illustrated in figure 9 display screen structure schematic diagram in colored ultraphotic angle naked eye 3D display, includes at least one layer of directive property
Projection screen, liquid crystal display panel, colored filter and light source.Incident light source is after directive property projection screen by nanometer grating picture
Element modulation exit direction modulates outgoing color by colored filter, the color viewing angle image provided on liquid crystal display panel is separated
Different points of view is converged at, viewpoint spacing meets above-mentioned ultraphotic angle naked eye 3D display condition.Rgb three coloured light corresponds to different nanometers
Grating pixel keeps rgb three coloured light exit direction identical, forms white or colored display.The sub-pix of same liquid crystal display panel
It is corresponding with directive property projection screen nanometer grating pixel.Light source can be white light and be also possible to rgb three coloured light.
Light source illumination needs to have certain inclination angle (such as Figure 10 (a)) or to illuminate (such as Figure 10 from below to up from top to down
(b))。
It is two visual angle pixel density distribution maps of multi-angle of view naked eye 3D display, due to two visual angles referring to attached drawing 11 (a)
It is distributed relatively far away from, greater than the width (5mm) of pupil of human, so one eye eyeball can not observe two visual angles simultaneously, therefore
It cannot achieve simple eye inspection display.In this case, simple eye focussing distance polymerize distance with eyes and mismatches, and leads to influx tune
Contradiction is saved, eye strain is easily made.The effect of the discontinuous influence Three-dimensional Display of parallax.It is that ultraphotic angle is naked referring to attached drawing 11 (b)
The visual angle pixel density distribution map of eye 3D display, the distance between three visual angles is sufficiently small, so that the one eye eyeball of people can be same
When observe more than two visual angles, realize ultraphotic angle naked eye 3D display.It is attached drawing 11 (b) pixel density referring to attached drawing 11 (c)
Superimposed approximate pixel density profile, since three viewing angle distributions are close enough, can approximation regard the distribution map of Figure 11 (c) as
Sample.Under which, time difference distribution is continuous, ensure that the authenticity of image.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to embodiment illustrated herein, and is to fit to consistent with the principles and novel features disclosed in this article
Widest scope.
The present invention proposes, using holographic imaging and wave-front conversion principle, by the direction projection screen containing nanometer grating and
Display technology combines, and realizes ultraphotic angle naked eye 3D display.The advantages of invention is first, and the image of observation is on spatial aspect
With convergence effect, while amplitude and phase information are carried, crosstalk is not present between different perspectives image.Second, point light source projection
Onto directive property screen, the nanometer grating pixel on directive property screen meets principle of holography, to the light by it with diffraction
Mode realizes the wave-front conversion imaging of light, and the interval between two neighboring visual angle is less than pupil size, enables the one eye eyeball of people
See more than two visual angles, forms the effect of monocular parallax.Third, the position of simple eye focusing are located on display object, and double
The position of eye polymerization is identical, reduces influx and adjusts contradiction, keeps viewing effect more natural.4th, using three color of red, green, blue
Point light source projects on three groups of pixel arrays, using nanometer grating to any regulating and controlling effect of light, by the visual angle of red, green, blue
Image is synthesized together in exit facet, realizes colored ultraphotic angle naked eye 3D display.5th, it, can using the refreshing of LCD cooperation image
Realize that naked eye 3D video in ultraphotic angle is shown.
Therefore, the present invention regulates and controls outgoing light direction using nanometer grating projection screen, cooperates LCD display technology,
The ultraphotic angle naked eye 3D display that low cost can be achieved, obtained image resolution ratio is high, and viewing no visual fatigue, viewing image is more
It is good.
Heretofore described pixelation is directed toward screen, and single pixel size can adjust according to the resolution ratio of screen, can
Realize 2D/3D switching.The visual angle several (n) figure is respectively corresponded to be shown with directive property pixel (n), formation 3D rendering.If not
Multi-view image, but single-view figure show that the Pixel Dimensions of 2D image are equal to (n* directive property here then forming 2D
Pixel Dimensions).Since Pixel Dimensions can accomplish very little, such as 20 microns, if it is 9 viewpoints, in this way, 2D Pixel Dimensions are just
60 microns, display screen 2D image resolution ratio is not interfered with.
Heretofore described multi-angle of view pixel is directed toward screen, three color laser source (or white light) of extending type and provides more views
The liquid crystal display combination of angle image is, it can be achieved that stereo-picture is shown.It is modulated by liquid crystal display and the amplitude information of image is provided, by referring to
There is provided position phase (visual angle) information to screen, by three color laser beam expanding light fields provide backlighting for, constitute of the present invention super
Visual angle 3D laser display mould group.Display stereo-picture has characteristic identical with hologram, in other words, from of the present invention
In the bore hole 3D display device of ultraphotic angle, for the 3-D image watched as actual 3-D image, there is no watch for a long time
The ocular vision fatigue generated afterwards, is conducive to sight protectio.
Shown in Figure 12, it is assumed that A (x, y, 0) point is any point coordinate on phase board, and B (h, 0, z) point is that viewpoint position is sat
Mark, c (x, y-tan θ * z, z) point are that incident ray space coordinate vector CA (0, ztan θ ,-z) and vector BA (x-h, y, z) interferes
Striped is formed, waveguide index is n according to grating equation:
In the space frequency that the direction x is formed
In the space frequency that the direction y is formed
Null tone on the face xoy
The angle of orientation (angle in groove vertical direction and x-axis) φ on the face xoy
Then
Wherein cos α 1, cos β 1 are cosine of the vector CA in the direction x and y, and cos α 2, cos β 2 are vector BA in the direction x and y
Cosine
cosα1=0,
Above formula is substituted into equation (1) and (2) and is obtained
Assuming that 1 coordinate B1 of viewpoint (h1,0, z), the space frequency that 2 coordinate B2 of viewpoint (h2,0, z) is obtained according to above-mentioned formula
It is respectively as follows:
To meet super visual requirement: d=| h1-h2 | < pupil size can find out periodic inequality according to above-mentioned formula.
In the present invention, both directive property nanometer grating can be produced in film surface etching using nano-photoetching method,
Can also first be produced by the nano-photoetching method can be used for impression block, then by nano impression batch duplicating, to reduce screen
Curtain cost.And the price and cost of red, green, blue laser (LD or DPSSL) has reached application requirement.
In summary, the invention has the characteristics that:
1) ultraphotic angle laser display scheme of the screen in conjunction with LCD Panel will be directed toward；
2) it is directed toward screen and contains nanometer grating pixel array, it is corresponding with ultraphotic angle images match.According to image presentation mode,
Being directed toward screen can be transmission-type, be also possible to reflection-type；
3) in the rear of screen or front, by three monochromatic sources of red, green, blue, with certain incident angle and position
It projects on screen, makes red, green, blue light by being directed toward screen conjunction beam and in same exit direction and same space viewpoint,
Form the accurately image of color image；
4) be directed toward screen and have to each multi-view image and assemble imaging function, between the convergence viewpoint of formation between to be divided into pupil big
Within small, so that the one eye eyeball of people is seen more than two visual angles simultaneously, form continuous parallax, solves the influx lance of human eye
Shield；
5) it is directed toward screen and contains nanometer grating, screen periods, orientation and azimuth can be according to principle of holography and grating sides
Journey, which calculates, to be obtained.Red, green, blue wavelength is projected on the different location of screen, by the spatial reuse of nanometer grating, forms 3D figure
The colored synthesis of picture.Incident angle can be calculated according to grating equation, and position can be calculated according to holographic imaging formula；
6) being directed toward the nanometer grating of projection screen is embossment structure, the batch system by nano impression mode, for screen
It makes, reduces screen manufacturing cost.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection scope.
Claims (7)
1. projection screen is directed toward at a kind of ultraphotic angle of dot structure containing nanometer grating, which is characterized in that including at least one direction
Screen, the light-emitting surface for being directed toward screen are equipped with multiple groups pixel array, are directed toward with the light that the pixel organized in pixel array issues
Same visual angle；
Distance is less than pupil size between the adjacent visual angle, when distance is less than pupil size between adjacent view further according to grating side
Journey finds out periodic inequality.
2. projection screen is directed toward at a kind of ultraphotic angle of dot structure containing nanometer grating according to claim 1, feature exists
In respective pixel array is fitted into mutually according to holographic imaging principle between pixel array described in each group, is distributed in the direction
On the light-emitting surface of screen, the pixel array of difference group has the convergence viewpoint of different positions, collectively constitutes ultraphotic angle viewpoint point
Cloth.
3. projection screen is directed toward at a kind of ultraphotic angle of dot structure containing nanometer grating according to claim 1, feature exists
In the period of nanometer grating, the mutual relationship of orientation meet principle of holography inside the pixel.
4. projection screen is directed toward at a kind of ultraphotic angle of dot structure containing nanometer grating according to claim 1, feature exists
In, the behind for being directed toward screen or front are set there are three monochromatic point light source, the light that the point light source issues from top to down or
It is incident on the behind for being directed toward screen from below to up.
5. projection screen is directed toward at a kind of ultraphotic angle of dot structure containing nanometer grating according to claim 4, feature exists
In after direction screen described in the point light source diffused illumination, by the pixel of multi-angle of view composograph and the nanometer being directed toward on screen
Grating pixel is corresponding, after the propagation of space length, forms the optical output field of different points of view, multiple views light field forms ultraphotic
Angle.
6. projection screen is directed toward at a kind of ultraphotic angle of dot structure containing nanometer grating according to claim 4, feature exists
In three monochromes are red, green and blue.
7. projection screen, feature are directed toward in a kind of ultraphotic angle of dot structure containing nanometer grating according to claim 4 or 5
It is, the incident angle of three monochromes point light source and the relationship of wavelength meet optical grating diffraction equation.
Priority Applications (1)
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| WO2017039820A1 (en) * | 2015-09-05 | 2017-03-09 | Leia Inc. | Light concentrating backlight and near-eye display system using same |
| CN110869834A (en) * | 2017-05-17 | 2020-03-06 | 伊奎蒂公司 | Fixed focus image light guide with zoned diffraction grating |
| CN110727115A (en) * | 2019-11-05 | 2020-01-24 | 华东交通大学 | Super-multi-viewpoint near-to-eye display device based on diffractive optics |
| CN111175975B (en) * | 2020-01-16 | 2022-04-19 | 华东交通大学 | Near-to-eye display device for realizing large focal depth imaging |
| CN114167621A (en) * | 2021-12-07 | 2022-03-11 | 苏州大学 | Naked eye 3D display device |
| CN114167620A (en) * | 2021-12-07 | 2022-03-11 | 苏州大学 | Naked eye 3D display device |
| CN117642685A (en) * | 2021-12-30 | 2024-03-01 | 华为技术有限公司 | Backlight display assembly and electronic equipment |
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