CN102103319B - Three-dimensional display method and device based on quasi-random constructive interference - Google Patents
Three-dimensional display method and device based on quasi-random constructive interference Download PDFInfo
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Abstract
The invention discloses a three-dimensional display method and device based on quasi-random constructive interference. In the invention, a sub-light beam array is generated by adopting an amplitude phase adjustor array; a coherence sub-light source array is formed by gathering the sub-light beam array with a coherence sub-light source generator array which is aligned to the amplitude phase adjustor array; a single scattered stereoscopic image is formed through the constructive interference of coherence sub-light sources, and the positions of the coherence sub-light sources are randomly distributed; and the pixel position and phase of the scattered stereoscopic image are randomly arranged to eliminate a secondary diffraction image. The three-dimensional display method and device disclosed by the invention can adopt a liquid crystal display with low resolution to realize the real-time color display of a suspension stereoscopic image with a large dimension and can be widely applied to the fields of the three-dimensional display of a computer or a television, three-dimensional man-machine exchange, robot vision and the like.
Description
Technical field
The present invention relates to the three-dimensional imaging technical field; Relate more specifically to a kind of 3 d display device, be specially adapted to do computing machine and tv display screen, intelligent man-machine exchange based on accurate accidental constructive interference principle; Robot vision etc. can be widely used in fields such as teaching, scientific research, amusement, advertisement.
Background technology
Over nearly one, 20 year, lcd technology has obtained develop rapidly, from all commercializations of plate of flat liquid crystal display of the projection liquid crystal display board to tens of fraction of an inch cun inch.But the available liquid crystal display is mainly used in two dimensional surface to be shown; Even small size projecting camera LCD plate; Its Pixel Dimensions is compared with visible wavelength also in ten micron dimensions, and its resolution is also very low; Can't replace holofilm with them, carry out big visual field, high-quality 3D hologram stereo display.Patent of invention " based on the 3 D displaying method and the device of accidental constructive interference " (application number: 200810046861.8) proposed a kind of low resolution LCD that adopts and carried out the new method that 3 D stereo shows; Its core concept is to be converted into one by one independently sub-light source to each pixel of LCD; Constructive interference through these sub-light sources forms the three-dimensional picture point of series of discrete at three dimensions; In order to suppress the multiple imaging that high order diffraction produces, the position of sub-light source is stochastic distribution.The 3 D displaying method based on accidental constructive interference that this invention proposed also has some places to need further to improve; For example; Form discrete three-dimensional picture point through constructive interference and also be equivalent to a new sub-light source array, just constructive interference possibly take place, form new speck if their position is periodic arrangement; These specks are equivalent to noise, can disturb the space image that is shown.For another example; Also can there be some difficulties if utilize existing commercial two dimensional surface LCD to build the three-dimensional display apparatus that this invention proposes based on accidental constructive interference; Because existing commercial two dimensional surface LCD is when they work in the position when being adjusted to holotype mutually; Its phase range of adjustment does not often reach 2 π, generally has only 3 pi/2s, will cause serious position phase regulating error like this.Focus on when obtaining the position and be the pointolite of stochastic distribution when the pixel that adopts a microlens array to existing commercial two dimensional surface LCD in addition; Lenticular diameter must be much smaller than the size of the pixel of LCD; Lenticule just can move in a pixel coverage at random like this, but can cause huge luminous energy waste thus.The present invention will replenish perfect to the 3 D displaying method based on accidental constructive interference, simultaneously the structure based on the three-dimensional display apparatus of accidental constructive interference simplified renewal, reduce difficulty of processing, improve the efficiency of light energy utilization.
Summary of the invention
The objective of the invention is to be to provide a kind of 3 D displaying method, and suppress the generation of secondary diffraction image based on accurate accidental constructive interference.
Another object of the present invention is to be to provide a kind of three-dimensional display apparatus based on accurate accidental constructive interference, obtains the picture element that the higher efficiency of light energy utilization is become reconciled with the structure of simplifying.
To achieve these goals, the present invention adopts following technical proposals:
A kind of 3 D displaying method based on accurate accidental constructive interference, it may further comprise the steps:
A: look like to be decomposed into discrete picture point to 3 D stereo;
B: choose the discrete picture point of A in the step;
C: be the relevant sub-light source array of period profile from the locus, relevant sub-light source is randomly drawed in the brightness of the discrete picture point of choosing in going on foot according to B, and the brightness of discrete picture point is high more, and the number of the relevant sub-light source of randomly drawing is big more;
D: to each relevant sub-light source that C was randomly drawed in the step, calculate the distance of its discrete picture point of in B goes on foot, choosing and the phasic difference that causes thus, the required position phase adjustment amount of making of each relevant sub-light source equals this phasic difference;
E: to each relevant sub-light source of being randomly drawed in C step, confirm the required amplitude adjustment amount of making of each relevant sub-light source, this amplitude adjustment amount is a constant constant, or is proportional to the brightness of the discrete picture point that B chooses in the step;
F: to A all discrete picture points in the step; Repeat B to the E step; Note each relevant sub-light source and be directed against required position phase and the amplitude adjustment amount of making of each discrete picture point, the principle of suing for peace according to plural number calculates required total position phase and the amplitude adjustment amount of making of each relevant sub-light source;
G: deduct the initial bit phase of each relevant sub-light source self in the required total position phase adjustment amount made of each relevant sub-light source that from F step, calculates, obtain the required final position phase adjustment amount of making of each relevant sub-light source; The required total amplitude adjustment amount made of each relevant sub-light source that calculates in F step as the required final amplitude adjustment amount of making of each relevant sub-light source; Regulating relevant sub-light source array that the locus is period profile makes it produce final position mutually and the amplitude adjustment amount.
Described 3 D displaying method based on accurate accidental constructive interference is characterized in that in the step, look like to be decomposed into discrete picture point to 3 D stereo, and the position of discrete picture point being stochastic distribution at A.
Described 3 D displaying method based on accurate accidental constructive interference is characterized in that at B choosing the discrete picture point of A in the step in the step, and gives and should an additional bit phase be set discrete picture point, and this additional bit is stochastic distribution in 0～2 π scope;
Further; In D goes on foot; To each relevant sub-light source of being randomly drawed in C step; Calculate the distance of its discrete picture point of in B goes on foot, choosing and the phasic difference that causes thus, the required position phase adjustment amount of making of each relevant sub-light source equals this phasic difference and adds the additional bit phase that is provided with to this discrete picture point in the step at B.
A kind of device of realizing described 3 D displaying method based on accurate accidental constructive interference comprises:
Coherent source;
The narrow laser beam that said coherent source is sent expands the lamp optical system that bundle converts wide laser beam to;
Amplitude position phase regulator array, the wide laser beam that its each amplitude position phase regulator sends said lamp optical system is respectively regulated to generate separate beamlet array; And
Relevant sub-light source generator array; Its each relevant sub-light source generator is aimed at a corresponding amplitude position phase regulator of said amplitude position phase regulator array respectively; Make said separate beamlet incide each the relevant sub-light source generator in the relevant sub-light source generator array correspondingly, and converge the relevant sub-light source array that the generation position is period profile.
Described a kind of three-dimensional display apparatus based on accurate accidental constructive interference; It is characterized in that described amplitude position phase regulator array is made up of first, second, third transmission-type liquid crystal board and first, second, third polaroid; First polaroid, first transmission-type liquid crystal board, second transmission-type liquid crystal board, second polaroid, the 3rd transmission-type liquid crystal board and the 3rd polaroid are close to placement successively; The pixel of first, second, third transmission-type liquid crystal board is aimed at one by one; First transmission-type liquid crystal board works in the position with second transmission-type liquid crystal board and is adjusted to holotype mutually, and the 3rd transmission-type liquid crystal board works in amplitude and be adjusted to holotype.
Described a kind of three-dimensional display apparatus based on accurate accidental constructive interference; It is characterized in that described relevant sub-light source generator array is made up of the microlens array of period profile; Each lenticule in the microlens array is aimed at an amplitude position phase regulator in the phase regulator array of amplitude position respectively, and converges the relevant sub-light source array that the generation position is period profile.
Described a kind of three-dimensional display apparatus based on accurate accidental constructive interference; It is characterized in that described relevant sub-light source generator array by three the cover period profile first, second, third microlens array form; Every cover microlens array is aimed at the red, green, blue sub-pixel of first, second, third transmission-type liquid crystal board respectively, makes each lenticular optical axis overlap with the center of the red, green, blue sub-pixel of first, second, third transmission-type liquid crystal board of being aimed at.
Describe in the face of philosophy and technique scheme of the present invention down.
Be 200810046861.8 to application number at first, the three-dimensional imaging principle based on accidental constructive interference that name is called the patent of invention proposition of " based on the 3 D displaying method and the device of accidental constructive interference " describes.
Main based on the three-dimensional imaging principle of accidental constructive interference according to 2 points; The first, according to principle of optical interference, utilize the constructive interference of many relevant sub-light sources; Can any given position form bright spot in the space, and constitute discrete 3 D stereo picture through many such bright spots; The second, if make the position of all relevant sub-light sources be stochastic distribution, can eliminate the multiple imaging that high order diffraction produces, obtain single high-quality space image.
3 D displaying method and device based on accidental constructive interference that the present invention mainly proposes foregoing invention from following three aspects have carried out replenishing, improved and have simplified:
First; The inhibition of secondary diffraction image: through the discrete three-dimensional image that constructive interference produces, its each pixel is equivalent to a new pointolite, if the locus of these new pointolites is period profile; And coordination phase; The light that they send can interfere, and produces new speck in the space, forms secondary diffraction image.The present invention suppresses this secondary diffraction image through two approach, and one of which makes the position of discrete voxel be stochastic distribution, promptly in the process to space image discretize to be shown, adopts random division, avoids the cycle to divide; Its two, to each discrete voxel an additional bit phase is set at random in 0～2 π scope, but keeps its brightness constant because the human eye contraposition is mutually insensitive, therefore discrete three-dimensional image seems to have no variation.When the position of discrete voxel or position were stochastic distribution mutually, they just were difficult to produce secondary diffraction image through constructive interference.
The second, accurate stochastic distribution: strict stochastic distribution requires the position of pointolite to get the optional position with identical probability, but the stochastic distribution of this strictness can be brought the trouble on many manufacturing process.For simplified manufacturing technique; Can be the position quantization of pointolite, promptly the same as quantum mechanics, its variation is necessary for the integral multiple of a least unit; Be equivalent to each pointolite and can only be positioned on the fixing lattice point, and optional position that can not be between lattice point.These fixedly are period profile in the position of lattice point itself, but pointolite can be positioned on wherein any lattice point randomly, and the stochastic distribution that obtains thus is an accurate stochastic distribution.When the closeness of lattice point became big, accurate stochastic distribution just more and more trended towards strict stochastic distribution.When the pixel that adopts microlens array to liquid crystal board converges generation coherent point light source; Can be the location of pixels of liquid crystal board period profile as lattice point; Although consequent pointolite array also is period profile; But when producing some voxels through constructive interference, we let all pointolites participate in the generation of this voxel, produce this voxel but extract some pointolites randomly.The position of the pointolite that these are randomly drawed is accurate stochastic distribution just as stated.This accurate stochastic distribution can greatly suppress the generation of high order diffraction picture equally, particularly when the pixel separation of liquid crystal board is big, high order diffraction itself with regard to very a little less than, add the inhibition of accurate stochastic distribution, high order diffraction just can have been ignored.But this accurate stochastic distribution simplified manufacturing technique, particularly lenslet diameter can be suitable with the liquid crystal board pixel size, can improve the efficiency of light energy utilization greatly.
The 3rd, complete complex vector is regulated: existing commercial liquid crystal board is when working in the position mutually for holotype, and position phase range of adjustment often has only about 3 pi/2s, does not reach 2 π, can produce very large position phase regulating error like this.When carrying out the complex vector adjusting with existing commercial liquid crystal board in other words, in the complex vector space, have a quadrant not arrive approximately, it is incomplete that therefore this complex vector is regulated.We need the design special liquid crystal board for this reason, perhaps adopt two liquid crystal boards to carry out the position and regulate mutually, make a phase regulated quantity reach 2 π.
The present invention is that 200810046861.8 patent of invention is compared and had the following advantages and effect with application number particularly compared with prior art:
The first, through random division be provided with show discrete 3 D stereo picture location of pixels with mutually, suppressed the generation of secondary diffraction image, reduced the interference noise that causes thus; The second, the accurate stochastic distribution through pointolite simplifies the structure, and has improved the efficiency of light energy utilization; The 3rd, through employing polylith liquid crystal board, make that utilizing existing commercial liquid crystal board realization 0～2 π position to regulate mutually becomes possibility, has reduced a position phase regulating error.
Description of drawings
Fig. 1 is the structural representation of the present invention when adopting three blocks of transmissive liquid crystal display plates.
Fig. 2 is the microlens array structural representation of single periodic arrangement.
Fig. 3 is the microlens array structural representation of three cover periodic arrangement.
Embodiment
Embodiment 1:
When Fig. 1 has provided three blocks of transmissive liquid crystal display plates of a kind of employing based on the three-dimensional display apparatus synoptic diagram of accurate accidental constructive interference.It is made up of coherent source 1, lamp optical system 2, amplitude position phase regulator array 3 and relevant sub-light source generator array 4.The narrow laser beam that lamp optical system 2 is sent coherent source 1 expands bundle and converts wide laser beam to, and the amplitude position phase regulator array 3 of evenly throwing light on.Amplitude position phase regulator array 3 is made up of first, second, third transmission-type liquid crystal board 5,6,7 and first, second, third polaroid 8,9,10; First polaroid 8, first transmission-type liquid crystal board 5, second transmission-type liquid crystal board 6, second polaroid 9, the 3rd transmission-type liquid crystal board 7 and the 3rd polaroid 10 are close to placement successively; The pixel of first, second, third transmission-type liquid crystal board 5,6,7 is aimed at one by one; The polarization direction of first polaroid 8 and second polaroid 9 is mutually 60 degree; Make the piece transmission-type liquid crystal board 5 of winning work in the position and be adjusted to holotype (different liquid crystal ability plates mutually with second transmission-type liquid crystal board 6; Different value need be got in the polarization direction of polaroid; Down together), the polarization direction of second polaroid 9 and the 3rd polaroid 10 is mutually 90 degree, makes the 3rd transmission-type liquid crystal board 7 work in amplitude and is adjusted to holotype.Relevant sub-light source generator array 4 adopts microlens array 15, and its structure is as shown in Figure 2.Each lenticule in the microlens array 15 and each alignment of pixels of LCD, the sizableness of each pixel of each lenticular diameter and LCD, luminous energy maximizes the use like this.The wide laser beam that lamp optical system 2 the produces amplitude position phase regulator array 3 of evenly throwing light on; Each pixel of the amplitude position phase regulator array 3 that is made up of transmission-type liquid crystal board 5,6,7 is regulated with the position the amplitude of wide illuminating laser beam mutually; Form sub-laser beam array; A pixel produces a sub-laser beam, and the amplitude of each sub-laser beam is mutually separate with the position, focuses on through microlens array 15 and produces the pointolite array that the position is period profile; One of them sub-laser beam is aimed at a lenticule, converges through lenticule and produces a pointolite.
Embodiment 2:
Below in conjunction with the given device of Fig. 1, the 3 D displaying method based on accurate accidental constructive interference is described, a kind of 3 D displaying method based on accurate accidental constructive interference, it may further comprise the steps:
A: be decomposed into M to 3 D stereo as 11 and have the discrete picture point of certain space position and brightness, in decomposable process, adopt divide non-periodic, make the position of discrete picture point be stochastic distribution, M=21 in Fig. 1;
B: choose the some discrete picture point m of A in the step, and give and an additional bit phase Ф to be set discrete picture point
m, this additional bit phase Ф
mStochastic distribution in 0～2 π scope;
C: be the relevant sub-light source array of period profile from the locus that device shown in Figure 1 produced; Brightness according to the specific discrete picture point m that chooses in B step; Randomly drawing number is the relevant sub-light source of N, and the brightness of discrete picture point m is high more, and the number N of the relevant sub-light source of randomly drawing is big more; In Fig. 2, the coherent source of 24 generations that lenticule converges of blacking is chosen by extraction, and their position is accurate stochastic distribution;
D:, calculate the distance of the specific discrete picture point m that in B goes on foot, chooses its center and the phasic difference that causes thus, the required position phase adjustment amount Ф that makes of each relevant sub-light source to each relevant sub-light source j that C was randomly drawed in the step
Cj, mEqual above-mentioned phasic difference and add the additional bit phase Ф that B is provided with in the step discrete picture point m
m,
If these randomly drawed the initial bit of relevant sub-light source be zero mutually, with the coordination phase, and all be a phase Ф when light that they send arrives discrete picture point m
m, so just constructive interference can take place;
E: to each relevant sub-light source of being randomly drawed in C step, its required amplitude adjustment amount A that makes
Cj, mCan get a constant constant, or be proportional to the brightness of the specific discrete picture point m that chooses in B step;
F: to the discrete picture point of all M in A step, repeat B to the E step, note each relevant sub-light source simultaneously mutually and amplitude adjustment amount Ф to the required position of making of each discrete picture point
Cj, m, A
Cj, m, and obtain the required total position phase Ф that makes of each relevant sub-light source j according to vector superposed principle
CjAnd amplitude A
CjAdjustment amount:
G: the required total position phase adjustment amount Ф that makes of each relevant sub-light source j that from F goes on foot, calculates
CjIn deduct because the initial bit phase Φ of each relevant sub-light sources that various factors produced such as unevenness self of coherent illumination light source intrinsic brightness
0j, obtain the required final position phase adjustment amount of making of each relevant sub-light source, certainly in final position phase adjustment amount, can lose the integral multiple of 2 π.The required total amplitude adjustment amount A that makes of each relevant sub-light source that calculates F in step simultaneously
CjAs the final required amplitude adjustment amount of making of each relevant sub-light source.At last through driving circuit drives transmission-type liquid crystal board 5,6 and 7, make each relevant sub-light source produce above-mentioned final amplitude and adjustment amount mutually.
Through above-mentioned A-G totally 7 steps; Constructive interference through many sub-light sources can form initial volumetric as 11; Simultaneously because the position of sub-light source is accurate stochastic distribution; Therefore high order diffraction looks like greatly to be suppressed, and particularly when the cycle of sub-light source was very big, the high order diffraction picture can be ignored basically.If in the step, the locus of relevant sub-light source array is strict stochastic distribution at C, then the inhibition to the high order diffraction picture is bigger, can obtain single space image.Further because initial volumetric is stochastic distribution as 11 discrete locations of pixels with the position mutually, also will obtain fine inhibition by the relevant issuable secondary diffraction image of these three-dimensional discrete pixels, thereby the space image picture that assurance is shown is totally single, noise is low.
Embodiment 3:
As shown in Figure 2, if adopt existing commercial LCD, its each pixel (among the figure shown in the frame of broken lines) is made up of three subpixels 12,13 and 14, and this three subpixels vapor deposition respectively has the red, green, blue filter coating, is combined to form coloured image through three primary colors.When lenticule was aimed at each pixel, lenticular optical axis center overlapped with the center of sub-pixel 13 in the middle of being positioned at, but with scheme in about two subpixels 12 and 14 misalignment.Suppose three subpixels 12,13 and the corresponding red green blue tricolor of 14 difference among Fig. 2, and adopt parallel light; Produce the three primary colors pointolite respectively after then converging through lenticule, but the light cone that these pointolites send can point to different directions, wherein red light cone is downward-sloping; And blue light cone is inclined upwardly; And do not cross mutually, so just be difficult to be presented at the space same position to the red green blue tricolor space image, form a width of cloth color solid picture.In order to address this problem, can be as shown in Figure 3, adopt first, second, third microlens array 16,17 and 18 of three cover period profile, and respectively with the RGB sub-pixel alignment of liquid crystal board.In Fig. 3; The first cover microlens array 16 is aimed at red sub-pixel; The second cover microlens array 17 is aimed at green sub-pixels; And the 3rd cover microlens array 18 is aimed at blue subpixels, so just can guarantee to be converged by lenticule the red green blue tricolor light cone covering space same position of generation, realizes that the color solid picture shows.
Claims (7)
1. 3 D displaying method based on accurate accidental constructive interference, it may further comprise the steps:
A: look like to be decomposed into discrete picture point to 3 D stereo;
B: choose the discrete picture point of A in the step;
C: be the relevant sub-light source array of period profile from the locus, relevant sub-light source is randomly drawed in the brightness of the discrete picture point of choosing in going on foot according to B, and the brightness of discrete picture point is high more, and the number of the relevant sub-light source of randomly drawing is big more;
D: to each relevant sub-light source that C was randomly drawed in the step, calculate the distance of its discrete picture point of in B goes on foot, choosing and the phasic difference that causes thus, the required position phase adjustment amount of making of each relevant sub-light source equals this phasic difference;
E: to each relevant sub-light source of being randomly drawed in C step, confirm the required amplitude adjustment amount of making of each relevant sub-light source, this amplitude adjustment amount is a constant constant, or is proportional to the brightness of the discrete picture point that B chooses in the step;
F: to A all discrete picture points in the step; Repeat B to the E step; Note each relevant sub-light source and be directed against required position phase and the amplitude adjustment amount of making of each discrete picture point, the principle of suing for peace according to plural number calculates required total position phase and the amplitude adjustment amount of making of each relevant sub-light source;
G: deduct the initial bit phase of each relevant sub-light source self in the required total position phase adjustment amount made of each relevant sub-light source that from F step, calculates, obtain the required final position phase adjustment amount of making of each relevant sub-light source; The required total amplitude adjustment amount made of each relevant sub-light source that calculates in F step as the required final amplitude adjustment amount of making of each relevant sub-light source; Regulating relevant sub-light source array that the locus is period profile makes it produce final position mutually and the amplitude adjustment amount.
2. a kind of 3 D displaying method based on accurate accidental constructive interference according to claim 1 is characterized in that in the step, look like to be decomposed into discrete picture point to 3 D stereo, and the position of discrete picture point being stochastic distribution at A.
3. a kind of 3 D displaying method according to claim 1 based on accurate accidental constructive interference; It is characterized in that at B in the step; Choose the discrete picture point of A in the step, and give and should an additional bit phase be set discrete picture point, this additional bit is stochastic distribution in 0～2 π scope;
Further; In D goes on foot; To each relevant sub-light source of being randomly drawed in C step; Calculate the distance of its discrete picture point of in B goes on foot, choosing and the phasic difference that causes thus, the required position phase adjustment amount of making of each relevant sub-light source equals this phasic difference and adds the additional bit phase that is provided with to this discrete picture point in the step at B.
4. device of realizing the described 3 D displaying method based on accurate accidental constructive interference of claim 1 comprises:
Coherent source (1);
The narrow laser beam that said coherent source (1) is sent expands the lamp optical system (2) that bundle converts wide laser beam to;
Amplitude position phase regulator array (3), the wide laser beam that its each amplitude position phase regulator sends said lamp optical system (2) is respectively regulated to generate separate beamlet array; And
Relevant sub-light source generator array (4); Its each relevant sub-light source generator is aimed at a corresponding amplitude position phase regulator of said amplitude position phase regulator array (3) respectively; Make said separate beamlet incide each the relevant sub-light source generator in the relevant sub-light source generator array (4) correspondingly, and converge the relevant sub-light source array that the generation position is period profile.
5. a kind of three-dimensional display apparatus according to claim 4 based on accurate accidental constructive interference; It is characterized in that: described amplitude position phase regulator array (3) is made up of first, second, third transmission-type liquid crystal board (5,6,7) and first, second, third polaroid (8,9,10); First polaroid (8), first transmission-type liquid crystal board (5), second transmission-type liquid crystal board (6), second polaroid (9), the 3rd transmission-type liquid crystal board (7) and the 3rd polaroid (10) are close to placement successively; The pixel of first, second, third transmission-type liquid crystal board (5,6,7) is aimed at one by one; First transmission-type liquid crystal board (5) works in the position with second transmission-type liquid crystal board (6) and is adjusted to holotype mutually, and the 3rd transmission-type liquid crystal board (7) works in amplitude and be adjusted to holotype.
6. according to claim 4 or 5 described a kind of three-dimensional display apparatus based on accurate accidental constructive interference; It is characterized in that: described relevant sub-light source generator array (4) is made up of the microlens array (15) of period profile; Each lenticule in the microlens array (15) is aimed at an amplitude position phase regulator in the amplitude position phase regulator array (3) respectively, and converges the relevant sub-light source array that the generation position is period profile.
7. a kind of three-dimensional display apparatus according to claim 5 based on accurate accidental constructive interference; It is characterized in that: described relevant sub-light source generator array (4) is made up of first, second, third microlens array (16,17,18) of three cover period profile; Every cover microlens array is aimed at the red, green, blue sub-pixel (12,13,14) of first, second, third transmission-type liquid crystal board (5,6,7) respectively, makes each lenticular optical axis overlap with the center of the red, green, blue sub-pixel (12,13,14) of first, second, third transmission-type liquid crystal board of being aimed at (5,6,7).
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