CN109856887A - A kind of squeezed light field display system and its lightfield compression algorithm based on liquid crystal light valve - Google Patents
A kind of squeezed light field display system and its lightfield compression algorithm based on liquid crystal light valve Download PDFInfo
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Abstract
The present invention relates to light field field of display technology, more particularly to a kind of squeezed light field display system and its lightfield compression algorithm based on liquid crystal light valve, including driving circuit and liquid crystal light valve array, liquid crystal light valve array includes the N layers of liquid crystal light valve layer being arranged side by side, N layers of liquid crystal light valve layer are arranged along the projecting direction of high speed DLP projector, the output end of computer is connect with driving circuit input terminal, the output end of driving circuit is divided into two-way, it is connected all the way with the input terminal of high speed DLP projector, another way is connect with each liquid crystal light valve of liquid crystal light valve array；Three-dimensional frame compression of images is input to driving circuit after N width two dimension sub-frame images by computer, N width two dimension sub-frame images are output to high speed DLP projector by driving circuit, high speed DLP projector successively projects N width two dimension sub-frame images to liquid crystal light valve array layer, driving circuit Collaborative Control corresponds to liquid crystal light valve array layer and is in scattering state, to form three-dimensional image in visual field.
Description
Technical field
The present invention relates to light field field of display technology, and in particular to a kind of squeezed light field display system based on liquid crystal light valve
And its lightfield compression algorithm.
Background technique
Human eye vision persistence effect refers to that human eye remains to continue when object quickly moves after image seen by person disappears
Retain its image, persisting the time is about 0.05s~0.2s.Light field display technology is the introducing light field concept in stereoscopic display.
Light field refers to light quantity of the light along different directions by some point in space.When people observe object, what is experienced is in space
The light intensity of distribution.
Existing light field display technology is mainly that integration imaging technology, more projection light field display technologies and squeezed light field show skill
Art, integration imaging technology and more projection light field display technologies are by reconstructing target in each parallax subgraph of liquid crystal screen display
The problems such as light field, that there are data volumes is big, image is fuzzy and parallax is discontinuous.Squeezed light field display technology using liquid crystal display be laminated come
It realizes Three-dimensional Display, solves the problems, such as that data volume is big.If the liquid crystal display quantity of stacking is more, stereoscopic effect is better.However it should
Display technology has the disadvantage in that 1, liquid crystal display transmitance is low (< 10%) using liquid crystal display, after light passes through liquid crystal display,
Light intensity meeting sharp-decay, therefore its liquid crystal display stacking number≤3；2, existing method directly drives muti-piece liquid crystal frequently with computer
Screen, but it is limited to the prior art, computer at most drives 4 pieces of liquid crystal displays at present, and weight is then needed when liquid crystal display quantity is higher than 4 layers
New design driven circuit；3, liquid crystal display response speed is slow (≤240Hz), and picture quality can not be promoted using multi-frame method, and
Liquid crystal display limited amount is in low transmission, therefore there are still poor image quality, the problems such as parallax is discontinuous.
Applicant by retrieval, discovery Chinese patent CN106647094B be and the immediate prior art of the application.Its
Publication date is on January 15th, 2019, a kind of light field display device comprising multiple groups imaging modules, imaging modules packet described in every group
A liquid crystal lens array and a display screen are included, the liquid crystal lens array is set to the light emission side of the display screen, wherein described
The imaging of multiple groups imaging modules is parallel to each other.Its technical solution can reduce display screen and the refreshing frequency of liquid crystal lens array is wanted
It asks, reduces response time requirement.But the emergent light of display screen is scattering light, cannot be assembled in liquid crystal lens, the image shown
Poor contrast, not enough vividly, the fidelity of display effect are poor.
Summary of the invention
The technical problem to be solved by the present invention is there are the technologies of poor image quality to ask for three-dimensional market display technology at present
Topic.Propose a kind of display based on the liquid crystal light valve clear lively continuous squeezed light field display system of parallax and its light field pressure
Compression algorithm.
In order to solve the above technical problems, the technical solution used in the present invention are as follows: a kind of squeezed light based on liquid crystal light valve
Field display system, including computer and high speed DLP projector, further include driving circuit and liquid crystal light valve array, the liquid crystal light
Valve array includes the N layers of liquid crystal light valve layer being arranged side by side, and N is the integer greater than 1, and the N layers of liquid crystal light valve layer is thrown along high speed DLP
The projecting direction of shadow machine arranges, and the output end of the computer is connect with driving circuit input terminal, the output end point of driving circuit
For two-way, wherein being connected all the way with the input terminal of high speed DLP projector, each liquid crystal light valve of another way and liquid crystal light valve array
Connection；Three-dimensional frame compression of images is input to driving circuit, the driving circuit after N width two dimension sub-frame images by the computer
The N width two dimension sub-frame images are output to high speed DLP projector, the high speed DLP projector modulates light, successively to liquid crystal
Light valve array layer projects the N width two dimension sub-frame images, and the driving circuit Collaborative Control corresponds to liquid crystal light valve array layer and is in
Scattering state, to form three-dimensional image in visual field.
Preferably, the driving circuit includes decoding circuit, image processing circuit and liquid crystal light valve control circuit, it is described
Decoding circuit includes ADV7611 decoding chip, and described image processing circuit includes the first fpga chip, the liquid crystal light valve control
Circuit includes the second fpga chip；The input terminal of the decoding circuit is connected with computer, and computer passes through DVI interface for image
After data input decoding circuit, by decoding circuit decoding data, decoded image data is sent into image processing circuit
First fpga chip, the every reception piece image data of the first fpga chip, will generate a pulse signal and is sent to the liquid crystal
Light valve control circuit, while the first fpga chip in described image processing circuit successively passes the N width two dimension sub-frame images
It is defeated by the high speed DLP projector, after the liquid crystal light valve control circuit receives pulse signal, the second fpga chip is by one
A solid frame shows time ttotalIt is divided into N equal portions, when DLP projects kth (1≤k≤N) width two dimension sub-frame images, i.e., when current
Carve tkMeetWhen, liquid crystal light valve control circuit sends signal " 01 " to kth layer liquid crystal light valve,
Signal " 00 " is sent to remaining liquid crystal light valve, kth layer liquid crystal light valve layer is made to be in scattering states, remaining liquid crystal light valve layer is in saturating
Penetrate state.
Preferably, the N layers of liquid crystal light valve layer is parallel along the projecting direction of high speed DLP projector and arranges at equal intervals
Column.
Preferably, the liquid crystal light valve is polymer stabilized cholesteric phase liquid crystal light valve.The present invention utilizes polymer stabilizing
The high transmittance (>=80%) of cholesteric liquid crystal light valve can have higher brightness, example than common liquid crystals screen under the identical number of plies
Such as under identical backlight intensity, 3 layers are improved 19 times than common liquid crystals screen brightness；Liquid crystal light valve is as imaging support simultaneously, because of it
With high transmittance and high response speed, more liquid crystal light valves can be laminated in space, mention picture quality and the depth of field significantly
Height shows that being only able to achieve 3 layers of liquid crystal display stacks, according to liquid crystal light using liquid crystal display as the squeezed light field of imaging support at present
Valve can be realized as imaging support stacks 6 layers of liquid crystal light valve, and the depth of field improves 1 times, and Y-PSNR (PSNR) is promoted by 28.02dB
To 30.18dB；
A kind of lightfield compression algorithm, suitable for a kind of squeezed light field display system based on liquid crystal light valve as the aforementioned,
The following steps are included: A) computer according to three-dimensional frame image obtain target light set L；B ray tracing) is utilized
Technology calculates the intersecting point coordinate of every layer of liquid crystal light valve of all target lights and liquid crystal light valve array；The m articles target light LmWith
Kth layer liquid crystal light valve is in tkMoment intersecting point coordinate is expressed as (k, xk,yk,tk), target light LmLight intensity is expressed as Im；C mesh) is rebuild
Mark light Lm, obtain rebuilding light Pm；Rebuild light PmThe light processing parameter for needing to meet are as follows:Wherein,I(k,xk,yk,tk)
Indicate tkMoment target light LmWith kth layer liquid crystal light valve intersecting point coordinate (k, xk,yk,tk) punish the light intensity being fitted on, I 'mIndicate weight
Build light PmLight intensity, ttotalIndicate total display time of pre- one three-dimensional frame, every width two dimension sub-frame images show that the time isK is integer, and 1≤k≤N, 1≤xk≤xmax, 1≤yk≤ymax, N is the integer greater than 1；xmaxFor two-dimentional sub-frame images
Horizontal resolution, ymaxFor two-dimentional sub-frame images vertical resolution；D) make all target lights simultaneously and rebuild the error of light
Minimum needs to meet another light processing parameter i.e.:Wherein, I=[I1,I2,…,
Im,…,Is], I '=[I '1,I′2,…,I′m,…,Is'], I indicates the set of all target light light intensity, and I ' expression is all heavy
The set of light light intensity is built, s indicates all quantity for rebuilding light；E it) is obtained by step C, D As tkMoment is in kth layer liquid crystal light valve layer to aobvious
The two-dimentional sub-frame images shown, whenIn tkWhen moment is full 0 matrix, indicate in tkMoment kth layer liquid crystal light valve layer is to penetrate
State.
Preferably, method for solving used in step E is in Trust Region, quasi-Newton method, interior point method and multiplier method
One or more.
Substantial effect of the invention is: 1, the present invention utilize the high transmittance of polymer stabilized cholesteric phase liquid crystal light valve
(>=80%) can have higher brightness than common liquid crystals screen under the identical number of plies, such as under identical backlight intensity, 3 layers of ratio
Common liquid crystals screen brightness improves 19 times；Liquid crystal light valve is as imaging support simultaneously, because it is with high transmittance and high response speed,
More liquid crystal light valves can be laminated in space, significantly improve picture quality and the depth of field, at present using liquid crystal display as imaging
The squeezed light field of carrier shows that being only able to achieve 3 layers of liquid crystal display stacks, and can realize stacking 6 as imaging support according to liquid crystal light valve
Layer liquid crystal light valve, the depth of field improve 1 times, and Y-PSNR (PSNR) is promoted by 28.02dB to 30.18dB；
2, the high response characteristic based on liquid crystal light valve, the lightfield compression algorithm of proposition, by every target light when
Between and light intensity integral calculation obtain rebuild light, obtain every layer of liquid crystal light valve corresponding position light intensity, utilize global optimization side
Method (such as Trust Region, quasi-Newton method, interior point method, multiplier method) optimized after two-dimentional sub-frame images, pass through human eye vision
Persistence effect realizes that stereo-picture reproduces；
3, the present invention, which devises the new driving circuit of one kind, allows computer to drive muti-piece liquid crystal light valve simultaneously, improves
Liquid crystal light valve stacks quantity.
Detailed description of the invention
Fig. 1 is one squeezed light field display system schematics of embodiment.
Fig. 2 is liquid crystal light valve through state schematic diagram.
Fig. 3 is liquid crystal light valve scattering states schematic diagram.
Fig. 4 is embodiment one drive circuit composition block diagram.
Fig. 5 is one decoding circuit hardware elementary diagram of embodiment.
Fig. 6 is FPGA image processing circuit hardware elementary diagram of the embodiment one based on model 5CEFA9F31I7.
Fig. 7 is FPGA liquid crystal light valve control circuit hardware elementary diagram of the embodiment one based on model EP1C3T144C8N.
Fig. 8 is embodiment one drive circuit program chart.
Fig. 9 is embodiment one drive circuit flow chart.
Figure 10 is one 6 layers of liquid crystal light valve operation schematic diagram of embodiment.
Wherein: 1- computer；2- driving circuit；3- high speed DLP projector；4- liquid crystal light valve array.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, a specific embodiment of the invention is further described in detail.
Embodiment one:
A kind of squeezed light field display system based on liquid crystal light valve, as shown in Figure 1, the present embodiment includes computer 1, driving
Circuit 2, high speed DLP projector 3 and liquid crystal light valve array 4；The core component of high speed DLP projector 3 is DMD, is set of number
Micro mirror array, as the spatial light modulator modulated to light.The output end of computer 1 is connect with 2 input terminal of driving circuit, is driven
The output end of dynamic circuit 2 is divided into two-way, connects all the way with the input terminal of high speed DLP projector 3, and another way is respectively and liquid crystal light valve
Every layer of liquid crystal light valve of array 4 connects.
Liquid crystal light valve array 4 includes 6 layers of liquid crystal light valve, and 6 layers of liquid crystal light valve are along the projecting direction of high speed DLP projector 3
Parallel and equidistant arrangement, every layer of liquid crystal light valve is polymer stabilized cholesteric phase liquid crystal light valve, the transmission of every layer of liquid crystal light valve
State and scattering states switching time≤1ms, and through transmitance >=80% of state；As shown in figure 3, each layer liquid crystal light valve is in scattering
When state, incident ray can be imaged on it in liquid crystal light valve surface scattering, projected image, be accordingly used in showing two-dimentional subframe
Image；As shown in Fig. 2, incident ray passes through liquid crystal light valve when each layer liquid crystal light valve is in through state, the direction of propagation is constant.
Three-dimensional frame compression of images is 6 width two dimension sub-frame images using lightfield compression algorithm and is encoded to by computer 1
Piece image output；High speed DLP projector 3 modulates light, successively projects 6 width two dimension sub-frame images to liquid crystal light valve array 4；It drives
Dynamic circuit 2 is used to receive the image that computer 1 is sent and successively inputs 6 width two dimension subframe patterns to high speed DLP projector 3
Picture, while driving circuit 2 controls corresponding liquid crystal light valve layer and is in scattering state；So that 6 width two dimension sub-frame images are successively right
It answers and is imaged in liquid crystal light valve layer, 6 width two dimension sub-frame images form the 3-D image of preset field of view.
2 composition block diagram of driving circuit is as shown in figure 4, by decoding circuit, image processing circuit, liquid crystal light valve drive control electricity
Road composition.Decoding circuit such as Fig. 5 is by DVI interface J5, ADV7611 chip U14；Image layered module hardware circuit diagram is as schemed
Shown in 6, by first fpga chip U1, JTAG (1) download port P1 and LVDS output port group of model 5CEFA9F31I7N
At.2 hardware elementary diagram of liquid crystal light valve driving circuit as shown in fig. 7, by the second fpga chip U2 of model EP1C3T144C8N,
JTAG (2) download port J3 and FFC interface J7 composition.The input terminal of decoding circuit is connected with computer 1, and computer 1 passes through DVI
After image data is inputted decoding circuit by interface J5, ADV7611 decoding chip decoding data, decoded picture number are first passed around
According to the first fpga chip into image processing circuit is sent, the every reception piece image data of the first fpga chip will generate one
Pulse signal is sent to liquid crystal light valve control circuit, while the first fpga chip in image processing circuit is by data again cutting
For N width two dimension sub-frame images and successively it is transferred to high speed DLP projector 3.When liquid crystal light valve control circuit receives pulse signal
Afterwards, a three-dimensional frame is shown time t by the second fpga chiptotalIt is divided into N equal portions, when DLP projection kth (1≤k≤N) width two dimension
When sub-frame images, i.e. current time tkMeetWhen, liquid crystal light valve control circuit is to kth layer liquid
Brilliant light valve sends signal " 01 ", sends signal " 00 " to remaining liquid crystal light valve, kth layer liquid crystal light valve layer is made to be in scattering states,
Remaining liquid crystal light valve layer is in transmission state.Select FPGA for core processor, is had because he belongs to half formulation circuit structure
Powerful parallel ability and abundant interior resource, can use pipeline mode, and the speed of service faster, designs more flexible.
Decoding circuit hardware elementary diagram is as shown in figure 5, by DVI interface J5, ADV7611 chip U14.Decoder module and calculating
Machine 1 by DVI connection, data transmission pin 1-TMDS Data2- of DVI, 2-TMDS Data2+, 9-TMDS Data1-,
10—TMDS Data1+、17—TMDS Data0-、18—TMDS Data0+、23—TMDS Clock+、24—TMDS
Clock- by differential signal transmission mode respectively with the data of ADV7611 transmit 12-RXA_2- of pin, 13-RXA_2+,
9-RXA_1-, 10-RXA_1+, 6-RXA_0-, 7-RXA_0+, 4-RXA_C+, 3-RXA_C- are connected, by decoding chip
The data that computer 1 inputs are decoded by ADV7611, and decoded data transmit 15-P23 of pin, 16-by data
P22、17—P21、18—P20、19—P19、20—P18、21—P17、22—P16、26—P15、27—P14、28—P13、
29—P12、30—P11、31—P10、32—P9、33—P8、35—P7、36—P6、37—P5、38—P4、39—P3、41—
P2,42-P1,43-P0,45-DE, 46-HS, 47-VS/FIELD/ALSB are output to image processing circuit；Image procossing electricity
Road hardware elementary diagram as shown in fig. 6, by model 5CEFA9F31I7N first fpga chip U1, JTAG download port P1 and
LVDS output port composition.First fpga chip 5CEFA9F31I7N chip correspond to I/O pin R30, T30, R26, T25, T29,
T28、U28、V29、V30、W30、W29、W28、AA30、AA28、AA29、AB29、AB28、AC30、AC29、AD30、AD29、
The output pin of AE30, AF28, AF30, AF29, AG29, AH30 respectively with above-mentioned ADV7611 chip links.First fpga chip
Decoded image data cutting is N width two dimension sub-frame images, the I/O mouth of the first fpga chip by 5CEFA9F31I7N chip
AJ15、AK15、AG17、AH17、AJ17、AJ18、AJ20、AK20、AK21、AK22、AH21、AJ22、AJ23、AK23、AJ25、
AK25, AJ27, AK26, AK27, AK28 are connected with the port LVDS 8~17,20~29 respectively, by the port LDVS by N two
Dimension sub-frame images send high speed DLP projector 3 to, are the data transmission because of its strong antijamming capability using LVDS coding mode
Amount is big.The 2nd FPGA core in first fpga chip 5CEFA9F31I7N chip I/O mouthfuls of AJ1 and liquid crystal light valve drive control circuit
Piece EP1C3T144C8N chip I/O mouth 103 is connected.Liquid crystal light valve drive control circuit hardware elementary diagram is as shown in figure 9, second
Fpga chip EP1C3T144C8N chip I/O mouth 55~62,67~70 is connect with liquid crystal light valve, wherein 55~56 and first block of liquid
Brilliant light valve is connected, and 57~58 are connected with second piece of liquid crystal light valve, and 59~60 are connected with third block liquid crystal light valve, and 61~62 and the 4th
Block liquid crystal light valve is connected, and 67~68 are connected with the 5th piece of liquid crystal light valve, and 69~70 are connected with the 6th piece of liquid crystal light valve.Wherein JTAG
(1) download port and JTAG (2) download port J3 are respectively the code download port of the first fpga chip and the second fpga chip,
For program debugging and programming.
Fig. 8 is 2 system software general diagram of driving circuit.System software uses modular design method, by decoder module, figure
As hierarchical block, liquid crystal light valve drive control module form.
Fig. 9 is 2 program flow diagram of driving circuit, it is a cyclic program, after circuit board powers on, program automatic running,
Entire program will carry out respective handling to each subprogram according to setting means.Its basic process are as follows: after powering on, to the first FPGA
Chip, the second fpga chip and ADV7611 chip initiation；Then the first FPGA configures ADV7611 chip, can correctly solve
The image data that code is inputted from computer 1；Decoded image data is divided into N width two dimension sub-frame images by image layered module,
It is sequentially transmitted to high speed DLP projector 3, issues pulse signal at the same time to the second fpga chip, when the 2nd FPGA core
Piece receives and a three-dimensional frame is shown time t after pulse signaltotalIt is divided into N equal portions, when DLP projection kth (1≤k≤N) two
When tieing up sub-frame images, i.e. current time tkMeetWhen, liquid crystal light valve control circuit is to kth layer
Liquid crystal light valve sends signal " 01 ", sends signal " 00 " to remaining liquid crystal light valve, kth layer liquid crystal light valve layer is made to be in scattering states,
Remaining liquid crystal light valve layer is in transmission state.
A kind of lightfield compression algorithm, comprising the following steps:
A) computer 1 obtains the set L of target light according to three-dimensional frame image；
B the intersection point of every layer of liquid crystal light valve of all target lights and liquid crystal light valve array 4) is calculated using ray tracing technology
Coordinate；The m articles target light LmWith kth layer liquid crystal light valve in tkMoment intersecting point coordinate is expressed as (k, xk,yk,tk), target light
LmLight intensity is expressed as Im；
C target light L) is rebuildm, obtain rebuilding light Pm；Rebuild light PmThe light processing parameter for needing to meet are as follows:
Wherein,
Indicate tkMoment target light LmWith kth
Layer liquid crystal light valve intersecting point coordinate (k, xk,yk,tk) punish the light intensity being fitted on, I 'mIt indicates to rebuild light PmLight intensity, ttotalIt indicates
Total display time of pre- one three-dimensional frame, every width two dimension sub-frame images show that the time isK is integer, and 1≤k≤N, 1
≤xk≤xmax, 1≤yk≤ymax, N is the integer greater than 1；xmaxFor two-dimentional sub-frame images horizontal resolution, ymaxFor two-dimentional subframe
Image vertical resolution；
D) make all target lights simultaneously and rebuild the error minimum of light, need to meet another light processing parameter i.e.:Wherein, I=[I1,I2,…,Im,…,Is], I '=[I '1,I′2,…,I′m,…,
Is'], I indicates the set of all target light light intensity, all set for rebuilding light light intensity of I ' expression, and s indicates all reconstruction light
The quantity of line；
E it) is obtained by step C, D As tkMoment two-dimentional sub-frame images to be shown in kth layer liquid crystal light valve layer.Method for solving used in step E
For one or more of Trust Region, quasi-Newton method, interior point method and multiplier method.
By above-mentioned calculating, all target lights can be decomposed to the corresponding position point of every layer of liquid crystal light valve, every layer of liquid crystal
The collection of all location points is combined into a width two dimension sub-frame images of preset field of view, as shown in Figure 10,6 layers of liquid crystal light valve arrays on light valve
At liquid crystal light valve array 4 can show 6 width two dimension sub-frame images；Two dimension subframe pattern to be shown specially on first layer light valve array
As being expressed as P (1, t1), t1ForOn second layer light valve array it is to be shown two dimension sub-frame images be expressed as P (2, t2), t2
ForOn third layer light valve array it is to be shown two dimension sub-frame images be expressed as P (3, t3), t3ForThe
On four layers of light valve array it is to be shown two dimension sub-frame images be expressed as P (4, t4), t4ForLayer 5 light valve array
Upper two-dimentional sub-frame images to be shown are expressed as P (5, t5), t5ForTwo dimension to be shown on layer 6 light valve array
Sub-frame images are expressed as P (6, t6), t6ForEvery width two dimension sub-frame images are respectively in corresponding liquid crystal light valve layer
Upper display, due to human eye vision persistence effect, viewer can experience 3D visual effect true to nature in preset field of view.With
It is compared using three-layer liquid crystalline substance screen overlapped way, so that the 3-D image depth of field in preset field of view is improved 1 using six layers of liquid crystal light valve stacking
Times, Y-PSNR (PSNR) is promoted by 28.02dB to 30.18dB.
Above embodiments are a kind of preferable scheme of the invention, are not intended to limit the present invention in any form,
There are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (7)
1. a kind of squeezed light field display system based on liquid crystal light valve, including computer and high speed DLP projector, feature exist
In,
It further include driving circuit and liquid crystal light valve array, the liquid crystal light valve array includes the N layers of liquid crystal light valve layer being arranged side by side,
N is integer greater than 1, the N layer liquid crystal light valve layer along high speed DLP projector projecting direction arrangement, the computer it is defeated
Outlet is connect with driving circuit input terminal, and the output end of driving circuit is divided into two-way, wherein defeated with high speed DLP projector all the way
Enter end connection, another way is connect with each liquid crystal light valve of liquid crystal light valve array；
Three-dimensional frame compression of images is input to driving circuit, the driving circuit after N width two dimension sub-frame images by the computer
The N width two dimension sub-frame images are output to high speed DLP projector, the high speed DLP projector modulates light, successively to liquid crystal
Light valve array layer projects the N width two dimension sub-frame images, and the driving circuit Collaborative Control corresponds to liquid crystal light valve array layer and is in
Scattering state, to form three-dimensional image in visual field.
2. a kind of squeezed light field display system based on liquid crystal light valve according to claim 1, which is characterized in that the drive
Dynamic circuit includes decoding circuit, image processing circuit and liquid crystal light valve control circuit, and the decoding circuit includes ADV7611 decoding
Chip, described image processing circuit include the first fpga chip, and the liquid crystal light valve control circuit includes the second fpga chip；
The input terminal of the decoding circuit is connected with computer, and image data is inputted decoding circuit by DVI interface by computer
Afterwards, by decoding circuit decoding data, decoded image data send the first fpga chip into image processing circuit, and first
The every reception piece image data of fpga chip, will generate a pulse signal and are sent to the liquid crystal light valve control circuit, simultaneously
The N width two dimension sub-frame images are successively transferred to the high speed DLP and thrown by the first fpga chip in described image processing circuit
Shadow machine, after the liquid crystal light valve control circuit receives pulse signal, a three-dimensional frame is shown the time by the second fpga chip
ttotalIt is divided into N equal portions, when DLP projects kth (1≤k≤N) width two dimension sub-frame images, i.e. current time tkMeet When, liquid crystal light valve control circuit sends signal " 01 " to kth layer liquid crystal light valve, to remaining fluid
Brilliant light valve sends signal " 00 ", so that kth layer liquid crystal light valve layer is in scattering states, remaining liquid crystal light valve layer is in transmission state.
3. a kind of squeezed light field display system based on liquid crystal light valve according to claim 1 or 2, which is characterized in that
The N layers of liquid crystal light valve layer is parallel and arrangement at equal intervals along the projecting direction of high speed DLP projector.
4. a kind of squeezed light field display system based on liquid crystal light valve according to claim 1 or 2, which is characterized in that
The liquid crystal light valve is polymer stabilized cholesteric phase liquid crystal light valve.
5. a kind of squeezed light field display system based on liquid crystal light valve according to claim 3, which is characterized in that the liquid
Brilliant light valve is polymer stabilized cholesteric phase liquid crystal light valve.
6. a kind of lightfield compression algorithm, aobvious suitable for a kind of squeezed light field based on liquid crystal light valve as described in claim 1 to 5
Show system, which is characterized in that
The following steps are included:
A) computer obtains the set L of target light according to three-dimensional frame image；
B the intersecting point coordinate of every layer of liquid crystal light valve of all target lights and liquid crystal light valve array) is calculated using ray tracing technology；
The m articles target light LmWith kth layer liquid crystal light valve in tkMoment intersecting point coordinate is expressed as (k, xk,yk,tk), target light LmLight intensity
It is expressed as Im；
C target light L) is rebuildm, obtain rebuilding light Pm；Rebuild light PmThe light processing parameter for needing to meet are as follows:Wherein,
Indicate tkMoment target light LmWith kth layer liquid crystal light valve intersecting point coordinate (k, xk,yk,tk) punish the light intensity being fitted on, I 'mIndicate weight
Build light PmLight intensity, ttotalIndicate total display time of pre- one three-dimensional frame, every width two dimension sub-frame images show that the time isK is integer, and 1≤k≤N, 1≤xk≤xmax, 1≤yk≤ymax, N is the integer greater than 1；xmaxFor two-dimentional sub-frame images
Horizontal resolution, ymaxFor two-dimentional sub-frame images vertical resolution；
D) make all target lights simultaneously and rebuild the error minimum of light, need to meet another light processing parameter i.e.:Wherein, I=[I1,I2,…,Im,…,Is], I '=[I '1,I′2,…,I′m,…,
I′s], I indicates the set of all target light light intensity, all set for rebuilding light light intensity of I ' expression, and s indicates all reconstruction light
The quantity of line；
E it) is obtained by step C, D I.e.
For tkMoment two-dimentional sub-frame images to be shown in kth layer liquid crystal light valve layer.
7. a kind of lightfield compression algorithm according to claim 6, which is characterized in that
Method for solving used in step E is one or more of Trust Region, quasi-Newton method, interior point method and multiplier method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910260358.0A CN109856887B (en) | 2019-04-02 | 2019-04-02 | Compressed light field display system based on liquid crystal light valve and light field compression algorithm thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910260358.0A CN109856887B (en) | 2019-04-02 | 2019-04-02 | Compressed light field display system based on liquid crystal light valve and light field compression algorithm thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109856887A true CN109856887A (en) | 2019-06-07 |
| CN109856887B CN109856887B (en) | 2021-11-16 |
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