CN112748570B - Orthogonal characteristic grating-pixel array pair and near-eye light field display module based on same - Google Patents
Orthogonal characteristic grating-pixel array pair and near-eye light field display module based on same Download PDFInfo
- Publication number
- CN112748570B CN112748570B CN201911045789.1A CN201911045789A CN112748570B CN 112748570 B CN112748570 B CN 112748570B CN 201911045789 A CN201911045789 A CN 201911045789A CN 112748570 B CN112748570 B CN 112748570B
- Authority
- CN
- China
- Prior art keywords
- grating
- orthogonal
- pixel
- characteristic
- pixel array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000007 visual effect Effects 0.000 claims abstract description 46
- 210000001747 pupil Anatomy 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 117
- 230000010287 polarization Effects 0.000 claims description 39
- 238000001514 detection method Methods 0.000 claims description 37
- 239000004973 liquid crystal related substance Substances 0.000 claims description 22
- 238000003384 imaging method Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 235000012431 wafers Nutrition 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000004904 shortening Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 206010052143 Ocular discomfort Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
- G02B2027/0114—Head-up displays characterised by optical features comprising device for genereting colour display comprising dichroic elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
Abstract
The invention discloses an orthogonal characteristic grating-pixel array pair, which is characterized in that an orthogonal generator and an orthogonal detector are introduced on the basis that the grating-pixel array pair guides emergent light beams of different pixels of a pixel array to different corresponding visual areas by utilizing the light splitting function of a grating of the grating-pixel array pair, and the adjacent grating units allow the emergent light beams of the pixels to pass through mutual incompatibility among the light orthogonal characteristics to block a pseudo visual area formed by transmission of the emergent light beams of the pixels through the adjacent grating units of the corresponding grating units. Further, a projection device is introduced to image an orthogonal characteristic grating-pixel array pair and a generated visual area thereof, and a near-eye light field display module is built by designing that the distance between adjacent visual areas is smaller than or equal to the pupil diameter of an observer. The blocking of the pseudo-visual area solves the crosstalk problem faced when the pupil of the observer and the area except the visual area image are overlapped, and allows the near-eye light field display module to realize the low-noise light field presentation by a small amount of visual areas, even two visual areas.
Description
Technical Field
The invention relates to the technical field of three-dimensional image display, in particular to an orthogonal characteristic grating-pixel array pair and a near-eye light field display module based on the same.
Background
On the basis of traditional two-dimensional display, development of three-dimensional image display technology is continuously focused on to generate a display scene consistent with the dimension of a real three-dimensional world. In the traditional stereoscopic vision-based three-dimensional display technology, corresponding views are projected to the eyes of an observer respectively, and the three-dimensional sense is formed by the fact that the view directions of the eyes respectively spatially intersect with corresponding depths. In this process, the viewer's eyes need to be focused on the display surface to see their respective views, thereby causing an inconsistency between the depth of focus and the depth of binocular convergence, i.e., a focus-convergence conflict problem. This problem can lead to visual discomfort for the observer, especially when near-to-eye displays are being made, which is a bottleneck that hinders the popularization and application of three-dimensional displays. Currently, from a variety of technical routes, researchers are struggling to investigate various methods that can alleviate or ultimately overcome this bottleneck problem. Among a plurality of viewing zones generated by optical devices in the existing near-eye optical field display device, crosstalk problem exists between corresponding views of adjacent viewing zones, and the problem needs to be solved.
Disclosure of Invention
The invention aims to provide an orthogonal characteristic grating-pixel array pair and a near-eye light field display module based on the orthogonal characteristic grating-pixel array pair through a visual area with the grating projection distance not larger than the pupil diameter of an observer, and solves the problem that noise formed when emergent light of each pixel passes through a non-corresponding grating unit in the traditional grating three-dimensional display affects the three-dimensional display quality. The orthogonal generator and the orthogonal detector are designed to allow the transmission of emergent light of each pixel to a non-corresponding grating adjacent to the corresponding grating of the pixel through the mutual incompatibility characteristic between the optical characteristics by designing adjacent grating units so as to realize low-noise near-eye light field display.
The object of the present invention is to provide an orthogonal characteristic grating-pixel array pair comprising:
the grating-pixel array pair comprises a pixel array for displaying light information and a grating, wherein the pixel array is formed by pixel arrangement, the grating is formed by grating unit arrangement, each grating unit corresponds to a pixel to form a pixel group corresponding to the grating unit, each pixel emergent light of the pixel group is respectively led to each corresponding visual area through the grating unit, each pixel of the pixel group is respectively visible in each corresponding visual area, and each corresponding pixel of each visual area constructs a corresponding pixel set of the visual area;
the orthogonal detector is formed by arranging orthogonal detection units, each orthogonal detection unit is arranged at each grating unit of the grating in a one-to-one correspondence manner and corresponds to the pixel group corresponding to the corresponding grating unit, and each orthogonal detection unit allows light beams with corresponding orthogonal characteristics to pass through and simultaneously blocks light beams with other non-corresponding orthogonal characteristics;
the orthogonal generator is arranged at the pixel array and is formed by arranging orthogonal generating units, each orthogonal generating unit corresponds to each orthogonal detecting unit of the orthogonal detector one by one, and grating units and pixel groups corresponding to the orthogonal detecting units are used for restraining the pixel emergent beams of the corresponding pixel groups to have corresponding orthogonal characteristics after passing through the orthogonal generating units.
The invention also provides a near-eye light field display module based on the orthogonal characteristic grating-pixel array pair, which comprises the orthogonal characteristic grating-pixel array pair and
the projection device is arranged in the grating-pixel array pair along the transmission direction of the emergent light beams of the pixel array, then projects the pixel virtual image of each pixel of the pixel array to the corresponding projection surface, constructs a pixel array virtual image, projects the grating unit virtual image of each grating unit of the grating to the corresponding projection surface, constructs a grating virtual image, and projects the image of each generated visual area to the vicinity of the effective visual area surface, wherein the image of each visual area is named as the effective visual area, and the adjacent interval of the effective visual area is smaller than or equal to the pupil diameter Dp of an observer;
and the control device is used for controlling each pixel to load corresponding light information, wherein the corresponding light information of each pixel is projection information of a scene to be displayed on the virtual image of the pixel with respect to the effective view area corresponding to the pixel.
Further, the orthogonal characteristic is a polarization characteristic in which polarization directions are perpendicular to each other, or a polarization characteristic in which polarization directions are respectively left-handed and right-handed, or a time sequence characteristic in which light is not simultaneously transmitted.
Further, the projection device is an optical device having an imaging function.
Further, the projection device is a lens, a lens group, a phase plate device, a grating device or a liquid crystal device with an imaging function.
Further, the projection device is an optical device with time sequence variation of focusing capability;
the near-eye light field display module of the orthogonal characteristic grating-pixel array pair is arranged to be capable of forming a plurality of projection surfaces and corresponding effective visual areas in a time sequence on different depths, when each projection surface is projected to different depths, the control device synchronously loads corresponding information to each pixel, wherein the corresponding information is projection information of a scene to be displayed on a virtual image of a corresponding pixel of the effective visual area of the pixel on the projection surface, and the depth of field of the displayed scene is improved based on visual retention;
or the binocular convergence depth of an observer is tracked in real time, the display information of a projection plane closest to the depth is synchronously driven by a control device, each pixel virtual image on the projection plane corresponds to pixel loading information, and the information is the projection information of a scene to be displayed on the corresponding effective visual area on the pixel virtual image, so that the display depth of field is improved.
Further, the projection device is a liquid crystal lens with controllable focal length time sequence or a composite liquid crystal lens formed by superposing a plurality of liquid crystal wafers, different focusing capacities can be generated by combining different liquid crystal wafers in the composite liquid crystal lens, and different time sequence focal lengths are realized by driving different liquid crystal wafer combinations in time sequence.
Further, the near-eye light field display module based on the orthogonal characteristic grating-pixel array pair further comprises a relay device, wherein the relay device is placed adjacent to the projection device and guides light beams from the pixel array to be transmitted to pupils of an observer.
Further, the relay device is a beam deflector that changes the propagation direction of the beam.
Further, the relay device is a reflecting mirror or a semi-transparent semi-reflecting mirror.
Further, the relay device is an optical path folding structure capable of shortening the spatial distance between the orthogonal characteristic grating-pixel array pair and the projection device.
Further, the optical path folding structure includes: a selective reflection-transmission mirror, an optical characteristic adjustment sheet, and a reflection sheet, wherein the selective reflection-transmission mirror respectively reflects and transmits light beams having different optical characteristics, defines transmission corresponding optical characteristics as transmission characteristics, and reflection corresponding optical characteristics as reflection characteristics;
wherein the positional relationship between the selective reflection-transmission mirror, the optical characteristic adjustment sheet, and the reflection sheet is set to satisfy the following condition: the light beam with the reflection characteristic is reflected after being firstly incident on the selective reflection-transmission mirror, is reflected again by the reflection plate after passing through the optical characteristic modulation plate once, is incident on the optical characteristic modulation plate again, and the light beam passing through the optical characteristic modulation plate twice is converted into the transmission characteristic from the reflection characteristic, and is continuously transmitted to the region where the pupil of the observer is located after being transmitted through the selective reflection-transmission mirror.
Further, the reflecting sheet is a reflecting mirror or a semi-transparent semi-reflecting mirror, and the reflecting characteristic and the transmitting characteristic are linear polarized light states with two mutually perpendicular polarization directions.
Further, the optical path folding structure further comprises a polarization state pre-adjusting sheet, and the light beams from the orthogonal characteristic grating-pixel array are modulated to be incident on the selective reflection-transmission mirror for the first time according to reflection characteristics.
Further, the optical path folding structure includes: a selective reflection-transmission mirror, a first optical characteristic adjustment sheet and a second optical characteristic adjustment sheet, a first reflection sheet and a second reflection sheet, wherein the selective reflection-transmission mirror respectively reflects and transmits light beams having different optical characteristics, defines transmission corresponding optical characteristics as transmission characteristics, and reflects corresponding optical characteristics as reflection characteristics;
wherein the selective reflection-transmission mirror, the first optical characteristic adjustment sheet and the second optical characteristic adjustment sheet, the positional relationship between the first reflection sheet and the second reflection sheet is set to satisfy the following condition: the light beam with the reflection characteristic is obliquely incident to the selective reflection-transmission mirror for the first time, is reflected by the second reflection sheet again after passing through the second optical characteristic modulation sheet once, is incident to the second optical characteristic modulation sheet again, and is converted into transmission characteristic from the reflection characteristic after passing through the second optical characteristic modulation sheet twice, and is transmitted to the region where the pupil of the observer is located after passing through the selective reflection-transmission mirror; the light beam with transmission characteristic is transmitted after being obliquely incident to the selective reflection-transmission mirror for the first time, is reflected by the first reflection sheet again after being subjected to primary treatment by the first optical characteristic modulation sheet, is incident to the optical characteristic modulation sheet again, and the light beam which passes through the second optical characteristic modulation sheet twice is converted into reflection characteristic by the transmission characteristic, is reflected by the selective reflection-transmission mirror and is continuously transmitted to the region where the pupil of an observer is positioned.
Further, the optical path folding structure is a medium with refractive index larger than air and arranged between the orthogonal characteristic grating-pixel array pair and the projection device.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention utilizes grating light splitting to project an effective visual area with the distance smaller than the pupil diameter to the pupil of an observer, and designs adjacent grating units to allow the mutual incompatibility characteristic among the optical characteristics to overcome the crosstalk between view information corresponding to each visual area, so that the near-eye optical field display with low noise can be realized by a small number of visual areas.
Drawings
Fig. 1 is a schematic diagram of the principle of multi-view projection of a conventional raster-pixel array pair.
Fig. 2 is a schematic diagram of an orthogonal characteristic grating-pixel array versus optical structure.
Fig. 3 is a schematic diagram of the principle of blocking out of the pseudomorphic region in the region generated by orthogonal characteristic grating-pixel array pairs.
Fig. 4 is a schematic diagram of the optical structure of a monocular near-eye light field display module based on orthogonal characteristic grating-pixel array pairs.
Figure 5 is a schematic diagram of pseudoscopic block out of a monocular near-eye light field display module based on orthogonal characteristic gate-pixel array pairs.
Fig. 6 is a schematic diagram of a monocular near-eye light field display module using a mirror as a relay device.
Fig. 7 is a schematic diagram of an example one of a monocular near-eye optical field display module with an optical path folding structure as a relay device.
Fig. 8 is a schematic diagram of an example two of a monocular near-eye optical field display module with a folded optical path structure as a relay device.
Fig. 9 is a schematic diagram of an example three of a monocular near-eye optical field display module with an optical path folding structure as a relay device.
Fig. 10 is a schematic diagram of a monocular near-eye light field display module with a relay device and a projection device integrated.
Fig. 11 is a schematic diagram of a monocular near-eye light field display module incorporating a relay device assembly and a projection device.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The invention provides the low-noise near-eye light field display module capable of realizing monocular multi-view by designing the adjacent grating units to allow the mutual incompatibility characteristic between the optical and optical characteristics to inhibit the crosstalk between the corresponding views of the adjacent vision areas when the grating is used for generating a plurality of vision areas by light splitting and controlling the interval between the adjacent vision areas, solves the problem of crosstalk when the pupils of an observer enter the area outside the vision area, and particularly allows the pupils of the observer to transmit a small amount of vision areas, even two vision areas, so as to realize the low-noise light field display. The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Examples
---------------------------------------------------------
The optical structure of a conventional grating-pixel array pair is shown in fig. 1, and includes a grating 20 and a pixel array 10. The pixel array 10 is formed by arranging pixels for displaying optical information and emitting light beams. According to the grating spectroscopic geometry shown in FIG. 1
(D e -D b )/D e ＝g/p e (1)。
The outgoing light of each pixel of the M pixel sets on the pixel array 10 is guided to M corresponding viewing zones through the grating 20. Wherein D is e Is the surface spacing between the display screen 10 and the viewing zone, D b Is the distance, p, between the display screen 10 and the light splitting device 20 e The distance g between adjacent pixels of the display screen 10 along the arrangement direction of the grating units of the grating 20 is equal to the distance between the centers of two adjacent grating units and the distance between the adjacent grating and the side points, M is the number of the generated visual areas, and M is equal to or greater than 2. In fig. 1, taking m=2 as an example, the pixels p1, p3, p5, p7, … form a pixel set 1, and the light emitted from the pixels is guided to the viewing zone vz1 by the grating 20, that is, all the pixels of the pixel set 1 are visible in the viewing zone vz 1; p2, p4, p6, p8, … constitute a pixelet 2 whose pixelet light is directed by the grating 20To view zone vz2, i.e. all pixels of pixel set 2 are visible within view zone zv 2. The grating units forming the grating 20 correspond to a pixel group including M pixels on the pixel array 10, and the M pixels of the pixel group emit light, which is respectively directed to the M viewing areas through the grating units. For example, in fig. 1, the grating unit g2 corresponds to a pixel group formed by the pixel p2 and the pixel p3, the light emitted from the pixel p2 and the pixel p3 is respectively directed to the viewing zones vz2 and vz1, the grating unit g3 corresponds to a pixel group formed by the pixel p4 and the pixel p5, the light emitted from the pixel p4 and the pixel p5 is respectively directed to the viewing zones vz2 and vz1, and so on. Each pixel loads projection information of a target scene to be displayed on the pixel corresponding to the pixel on the pixel, and views corresponding to the two visual areas can be received in the visual areas zv1 and zv2, so that multi-view presentation based on the grating is realized.
In practice, each raster unit corresponds to a pixel in the pixel group, and its emitted light may also be emitted through the raster unit adjacent to the raster unit, for example, pixels p2, p4, p6, … are directed to pseudoscopic region pz1 through non-corresponding raster units g1, g2, g3, …, respectively. While pixels p2, p4, p6, … load information as a view of the target scene relative to view region vz2, but not relative to pz1. Then the information received in pseudozone pz1 is erroneous information that is not needed by the observer, i.e. noise. Similarly, the information that the pixels p1, p3, p5, … are directed to pseudoscopic region pz2 via non-corresponding raster units g2, g4, g6, … is also present as noise.
To suppress the above noise, the present patent introduces the quadrature detector 40 and the quadrature generator 30 in the conventional grating-pixel array pair shown in fig. 1, constructing a quadrature characteristic grating-pixel array pair. The quadrature detector 40 is formed by arranging quadrature detection units, where each quadrature detection unit is disposed in one-to-one correspondence with each grating unit of the grating 20, and is in one-to-one correspondence with the corresponding pixel group of the corresponding grating unit, as shown in fig. 2. The quadrature detection units 40a, 40b, 40c, … of the quadrature detector 40 correspond to the grating units g1, g2, g3, … of the grating 20, respectively. Each orthogonal detection unit allows a light beam with corresponding orthogonal characteristics to pass through and enter the corresponding grating unit of the orthogonal detection unit, and simultaneously blocks light beams with other orthogonal characteristics from passing through. Fig. 2 illustrates the orthogonal characteristics of horizontal polarization and vertical polarization, where the xz in-plane direction is the horizontal direction and y is the vertical direction. The orthogonal detection units 40a, 40c, 40e and … are all horizontal polarizers, and the orthogonal detection units 40b, 40d and … are all vertical polarizers, wherein the horizontal polarizers only allow light beams with polarization directions along the horizontal direction to pass through, do not allow light with polarization directions along the vertical direction to pass through, and the vertical polarizers only allow light beams with polarization directions along the vertical direction to pass through and do not allow light with polarization directions along the horizontal direction to pass through.
The quadrature generator 30 is introduced at the pixel array 10 corresponding to the quadrature detection device 40 introduced at the grating array 20. The quadrature generator 30 is formed by arranging quadrature generating units, each quadrature generating unit corresponds to each quadrature detecting unit of the quadrature detector 40 and each grating unit and pixel group corresponding to the quadrature detecting unit one by one, and is arranged at the corresponding pixel group to restrict the pixel emergent beam of the corresponding pixel group to have the corresponding quadrature characteristic after passing through the quadrature generating unit. Specifically, in fig. 2, the quadrature generating units 30a, 30b, 30c, 30d, 30e, … and the detecting units 40a, 40b, 40c, 40d, 40e, … are sequentially in one-to-one correspondence, and are sequentially in one-to-one correspondence with the grating units g1, g2, g3, g4, g5, … corresponding to the detecting units 40a, 40b, 40c, 40d, 40e, …. The orthogonal generating units and the corresponding raster units also correspond to the same pixel group, namely, the orthogonal generating unit 30b corresponds to the pixel group formed by the pixel p2 and the pixel p3, the orthogonal generating unit 30c corresponds to the pixel group formed by the pixel p4 and the pixel p5, and so on. Each of the orthogonal detection units modulates the optical characteristics of the light beams from each of the pixels of the corresponding pixel group, and the light beams from each of the pixels of the corresponding pixel group are emitted by the orthogonal generation unit according to the orthogonal characteristics corresponding to the orthogonal detection units. Specifically, under the action of each orthogonal generation unit, the light emitted by the pixels p1, p4, p5, p8, … corresponding to the pixel group of the orthogonal detection units 40a, 40c, 40e, … respectively passes through the corresponding orthogonal generation units 30a, 30c, 30e, … and then all appears as horizontal polarized light, and all can pass through the corresponding orthogonal detection units, but cannot pass through the orthogonal detection units adjacent to the corresponding orthogonal detection units; the light emitted from the pixels p2, p3, p6, p7, … of the corresponding pixel group of the orthogonal detection units 40b, 40d, … is respectively transmitted through the corresponding orthogonal generation units 30b, 30d, …, and then is expressed as vertically polarized light, and the vertically polarized light can pass through the corresponding orthogonal detection units, but cannot pass through the orthogonal detection units adjacent to the corresponding orthogonal detection units. The orthogonal generation unit may be a polarizer or a wave plate (on the premise that the pixel emergent light is polarized light). Then, as shown in fig. 3, the pseudo-viewing areas pz1 and pz2 formed by the outgoing light of each pixel through the adjacent grating units of the corresponding grating units are blocked. In the above process, the orthogonal vertical polarized light and the horizontal polarized light can be replaced by linear polarized light with other two perpendicular polarized directions, or can be replaced by left-hand rotation and right-hand rotation on the premise of selecting the corresponding orthogonal detection units.
The orthogonality property may also be a timing property of adjacent raster units being cycled on at different points in time. For example, the orthogonal detection units are time sequence controllable switch apertures, and T groups of orthogonal detection units can be arranged, wherein each group of orthogonal detection units consists of one or more orthogonal detection units separated by T-1 orthogonal detection units. The T groups of orthogonal detection units are sequentially and sequentially opened at T time points t+t multiplied by delta T/T (positive integer T is equal to 2, positive integer T is equal to 0,1, … and T-1) in the time period delta T, only one group of orthogonal detection units is in an opened state at each time point, and the other groups of orthogonal detection units are in a closed state. When each orthogonal detection unit group is opened, corresponding information is loaded corresponding to each pixel group, and other pixel groups are closed or blocked by corresponding orthogonal generation units. When each pixel loads corresponding information, emergent light cannot pass through each T-1 orthogonal detection units adjacent to two sides of the corresponding orthogonal detection unit, so that the corresponding pseudo-visual area beside the visual area is generated by blocking. Other optical characteristics having orthogonal properties may be similarly used as the orthogonal characteristics instead of the polarization characteristics or the time series characteristics. In the above process, the grating arranged in the one-dimensional direction is taken as an example for explanation. The grating arranged in the one-dimensional direction can be replaced by a two-dimensional grating, and the two-dimensional grating is processed according to the process, so that the blocking of the pseudo-visual area adjacent to the visual area is realized. However, in both directions, the number of adjacent grating units of one grating unit increases, and more orthogonal characteristics, such as a combination of polarization characteristics and time sequence characteristics, are required to achieve pseudovision region blocking of adjacent vision regions in the two-dimensional direction.
Further introducing a projection device 50, placing the projection device in a grating-pixel array pair along the transmission direction of the emergent light beam of the pixel array 10, and constructing a monocular near-eye light field display module based on the orthogonal characteristic grating-pixel array pair, as shown in fig. 4. Wherein each pixel is information loaded by the control device 80. Fig. 5 is a view for explaining the display principle of the near-eye light field display module shown in fig. 4. The projection device 50 images the pixel virtual image of each pixel of the pixel array 10 onto the corresponding projection surface 11, constructs a pixel array virtual image 10', images the grating element virtual image of each grating element of the grating 20 onto the corresponding projection surface 21, constructs a grating virtual image 20', and projects the view area image of each generated view area onto the effective view area surface 51, wherein each view area image is named as an effective view area. In fig. 5, p '1, p'2, p '3, p'4, … are the pixel virtual images of the pixels p1, p2, p3, p4, … shown in fig. 4, g '1, g'2, g '3, g'4, … are the grating element virtual images of the spectroscopic units g1, g2, g3, g4, … shown in fig. 4, respectively, and the effective viewing zones Ivz1 and Ivz are the images of the viewing zones vz1 and vz2, respectively, generated as in fig. 1 when the projection device 50 is not present. Fig. 5 illustrates the real image of the view region as an effective view region, and the effective view region may be a virtual image of the corresponding view region. Due to the presence of quadrature detector 40 and quadrature generator 30, the pseudovision regions of the adjacent vision regions shown in fig. 2 are blocked, and their images are not shown in fig. 5. From the geometrical relationships shown in fig. 1, the viewing zone spacing e:
e＝(D e -D b )×p e /D b (2)。
then, the effective visual area distance e' is determined according to the object-image relationship. Adjusting the relevant optical parameters to enable
e′≤D p (3)，
The observer's pupil 70 in place may receive two views of active-areas Ivz1 and Ivz, respectively, loaded for the pixelets. Different sagittal light beams from the two views are spatially overlapped to form a monocular naturally focused spatial object point, so that light field display is realized. Each pixel is loaded with information by the control device 80, and each pixel corresponds to loading information, which is the view of the target scene about the effective view area corresponding to the pixel, and corresponds to the information on the virtual image of the pixel.
Fig. 5 illustrates that, by way of example, when more active views are generated with a spacing less than the observer's pupil diameter, the observer's pupil 70 corresponds to a single eye, a larger viewing area may be obtained, and two or more views received at any location within that area. With the effects of the quadrature detection unit 40 and the quadrature generation unit 30, pseudovision regions and their images do not appear. Then, there is a crosstalk-free region in the adjacent region of the active-view region, and when the pupil of the observer overlaps with the region due to uncontrolled offset from the center of the active-view region, as long as two or more views can be received, correct light-field information acquisition can still be ensured, without considering noise caused by the pseudoscopic region. This is particularly important for generating near-eye light field display modules with a smaller number of effective viewing zones. For example, in the case of the most extreme m=2 effective vision regions, the m=2 effective vision regions having a pitch not larger than the diameter of the observer pupil 70 may not completely cover the observer pupil 70 or may cover a region slightly larger than the observer pupil 70. Then, if a pseudoscopic image exists, its region will either inevitably overlap with the observer pupil 70 or will overlap with the observer pupil 70 if the observer pupil 70 is slightly off-centered from the active viewing zone. Noise in the region of the pseudoscopic image will severely affect the quality of the light information received by the observer's pupil 70. The near-eye light field module based on the orthogonal characteristic grating-pixel array pair avoids the problem, and enables near-eye light field display to be possible by a small amount of effective visual areas. And a small amount of effective visual areas can ensure that the corresponding views keep reasonable resolution, thereby being beneficial to the improvement of three-dimensional presentation quality.
In fact, the orthogonal characteristic grating-pixel array pair described in this patent may be applied to other optical systems that operate using conventional grating-pixel array pairs, instead of conventional grating-pixel array pairs in these systems, to reduce the impact of the conventional grating-pixel array on the crosstalk corresponding to the intrinsic pseudomorphic region.
Fig. 4 and 5 specifically use a single lens as the projection device 50, and the projection device 50 may be a lens group, a grating device, a liquid crystal device, or the like having an imaging function or a combination of devices. In particular, the projection device 50 may be an optical device with a time-varying focusing capability, such as a liquid crystal lens with a controllable focal length time sequence, and further such as a composite liquid crystal lens formed by stacking multiple liquid crystals. The liquid crystal lens can sequentially project virtual images of the pixel array to projection surfaces with different depths by changing the self phase modulation capability; the combination of different liquid crystal plates of the composite liquid crystal lens is functionally equivalent to lenses with different focal lengths, and different virtual images of the pixel array are projected to projection surfaces with different depths in a time sequence mode through time sequence driving of the different liquid crystal plate combinations. Information loading can be synchronously carried out according to the related process of FIG. 5 on a plurality of projection surfaces generated in time sequence, each projection surface is responsible for light field information projection in a certain depth range nearby, based on visual retention, light fields at different depths are projected on different projection surfaces, and space connection realizes display depth expansion; the external real-time tracking unit can also be utilized to track the binocular convergence depth of the observer in real time, synchronously drive the projection surface closest to the depth, load information according to the related process of fig. 5, and also have the function of improving the display depth of field. The former has high requirements on the refresh frequency of the modular device.
The light field display modules shown in fig. 4 and 5 based on orthogonal characteristic grating-pixel array pairs, which do not allow external ambient light to enter the observer's pupil 70, can be used as an eyepiece of a VR system, and two of the display modules construct a VR light field system. For further application to AR, a relay device 60 may be incorporated in the light field display module based on orthogonal characteristic grating-pixel array pairs, as illustrated in fig. 6. The relay device is disposed adjacent to the projection device 50, and may be disposed in front of the projection device 50 or behind the projection device 50 in the beam transmission direction, to guide the beam from the pixel array 10 to be transmitted toward the observer's pupil 70. Fig. 6 exemplifies a half mirror as the relay device 60. While reflecting the light beams from the pixel array, external ambient light is also allowed to enter the observer's pupil 70. Two AR systems can be constructed with the structure shown in fig. 6.
The relay device 60 may also be an optical path folding structure for shortening the spatial distance between the orthogonal grating-pixel array pair and the projection device 50 in order to realize a thinner optical field display module based on the orthogonal grating-pixel array pair. The optical path folding structure includes a selective reflection-transmission mirror 601, an optical characteristic adjustment sheet 602, and a reflection sheet 603. Among them, the selective reflection-transmission mirror 601 is characterized in that it respectively reflects and transmits light beams having different optical characteristics. The optical characteristic corresponding to the light beam transmitted by the selective reflection-transmission mirror 601 is defined as a transmission characteristic, and the optical characteristic corresponding to the reflected light beam is defined as a reflection characteristic. The spatial positions of the components of the light path folding structure are set so as to realize the following functions as criteria: the light beam with reflection characteristic from the pixel array is reflected after first entering the selective reflection-transmission mirror 601, then reflected again by the reflection sheet 603 after passing through the optical characteristic modulation sheet 602 for the first time, and enters the optical characteristic modulation sheet 602 again, and the light beam passing through the optical characteristic modulation sheet 602 twice changes the corresponding optical characteristic from reflection characteristic to transmission characteristic, and propagates to the region where the pupil 50 of the observer is located after transmitting the selective reflection-transmission mirror 601.
Fig. 7 illustrates a polarizing mirror as a specific example of the selective reflection-transmission mirror 601. The selective reflection-transmission mirror 601 reflects vertically polarized light having a polarization direction along the y-direction, which is indicated by "·" in the figure, and transmits horizontally polarized light having a polarization direction parallel to the xz-plane, which is indicated by "·" in the figureRepresenting horizontally polarized light. That is, the vertical polarization characteristic is taken as the reflection characteristic, and the horizontal polarization characteristic is taken as the transmission characteristic.
The reflection sheet 603 is a half mirror, and the optical property adjusting sheet 602 is a quarter wave plate. The circularly polarized light passing through the reflecting sheet 603 becomes a reflected light beam after passing through the optical characteristic adjusting sheet 602 for the first time, is reflected by the selective reflection-transmission mirror 601, enters the optical characteristic adjusting sheet 602 for the second time after being modulated into circularly polarized light, and enters the optical characteristic adjusting sheet 602 for the third time after being reflected by the reflecting sheet 603, and the outgoing light beam optical characteristic is modulated into a transmission characteristic, and transmits the selective reflection-transmission mirror 601 and propagates toward the region where the pupil 70 of the observer is located. In order to ensure that the optical characteristics of the light beam from the pixel array 10 after passing through the reflecting sheet 603 are circularly polarized light required by the optical characteristic modulating sheet 602, a polarization state pre-adjusting sheet 604 is arranged between the pixel array 10 and the reflecting sheet 603, and the optical characteristics of the light beam from the pixel array 10 are modulated so that the light beam becomes circularly polarized light required by the modulating sheet 602. Specifically, as shown in fig. 7, the light beam of the pixel array 10 is incident on the polarization state preconditioning sheet 604 and modulated into circular polarized light required by the optical property modulating sheet 602, the circular polarized light passes through the reflecting sheet 603, and then is modulated into vertical polarized light having a polarization direction along the y-direction after passing through the optical property modulating sheet 602, the vertical polarized light is then reflected by the selective reflection-transmission mirror 601 so as to be incident on the optical property modulating sheet 602 and modulated into circular polarized light having a polarization direction opposite to that of the circular polarized light of the first incident 602 by the optical property modulating sheet 602, and then the circular polarized light modulated by the optical property modulating sheet 602 is reflected by the reflecting sheet 603 and modulated into horizontal polarized light having a transmission polarization direction parallel to the xz-plane, and then is transmitted through the selective reflection-transmission mirror 601 and propagates toward the region where the pupil 70 of the observer is located. By passing the light beam through the space between the selective reflection-transmission mirror 601 and the reflecting sheet 603 three times, a thinner light field display module based on the orthogonal characteristic grating-pixel array pair is realized by folding the light path. It should be noted that when the selective reflection-transmission mirror 601 selects the polarization state as its reflection characteristic and transmission characteristic, the orthogonal characteristic of the orthogonal characteristic grating-pixel array pair cannot select the polarization state any more, and other orthogonal characteristics such as the timing characteristic need to be selected.
The folded structure of the optical path shown in fig. 8 uses a polarization beam splitter as the selective reflection-transmission mirror 601, and its reflection characteristic is a vertical polarization state and its transmission characteristic is a horizontal polarization state. Two reflective sheets: the first and second reflection sheets 603a and 603b, and the first and second optical property modulation sheets 602a and 602b as two quarter wave plates, respectively, perform optical path folding on the light beams transmitted and reflected by the selective reflection-transmission mirror 601, and finally all the light beams are guided to the observer's pupil 70, similarly to the method of the optical property modulation sheet 602 of fig. 7 in which the optical property of the light beam passing through the second time is changed from reflection property to transmission property. With respect to the beam compression structure shown in fig. 7, the structure shown in fig. 8 allows the orthogonal characteristic of the orthogonal characteristic grating-pixel array pair to be a polarization characteristic, i.e., to coincide with two polarization states corresponding to the transflective characteristic of the selective reflection-transmission mirror 601. With respect to the configuration shown in fig. 8, the configuration shown in fig. 9, which also employs a polarizing beamsplitter as the selective reflection-transmission mirror 601, allows external ambient light to enter the observer's pupil 70 via the selective reflection-transmission mirror 601, but at the same time, the external ambient light is often natural light in a non-polarized state, and the selective nature of the optical characteristics of the transmitted light by the selective reflection-transmission mirror 601 causes attenuation of the intensity of the external ambient light entering the observer's pupil 70. Meanwhile, in the structure shown in fig. 9, the orthogonal characteristics of the orthogonal characteristic grating-pixel array pair cannot select the polarization state any more.
The above-mentioned module optical structure, the optical path folding structure may be simply a medium with refractive index larger than air placed between the orthogonal characteristic grating-pixel array pair and the projection device 50, and the spatial distance between the orthogonal characteristic grating-pixel array pair and the projection device 50 may be considered as an equivalent optical path folding by increasing the optical path length at the same spatial distance.
The functions of the projection device 50 and the relay device 60 described above may be implemented by a single combined device, such as a free-form surface device having imaging, reflecting, and deflecting functions as shown in fig. 10. The surfaces F1, F2 and F3 together serve as the imaging function of the projection device 50, and the surfaces F2 and F3 in turn have the reflecting function of the relay device 60. The F4 plane is a transmission compensation plane that allows the external ambient light to pass through and enter the observer pupil 70 while compensating for the effect of the plane F3 on the external ambient light. In the structure having the optical path folding structure as the relay device 60 shown in fig. 8, the first reflecting sheet 603a and the second reflecting sheet 603b, which are components of the projection device 50 and the relay device, may be implemented by two reflection imaging lenses, such as 50a and 50b in fig. 11.
It is apparent that the above examples are merely illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. This can be achieved. And thus not exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (16)
1. An orthogonal characteristic grating-pixel array pair, comprising:
the grating-pixel array pair comprises a pixel array (10) for displaying light information and a grating (20), wherein the pixel array (10) is formed by pixel arrangement, the grating (20) is formed by grating unit arrangement, each grating unit corresponds to a pixel to form a pixel group corresponding to the grating unit, emergent light of each pixel of the pixel group is respectively led to each corresponding visual area through the grating unit, each pixel of the pixel group is respectively visible in each corresponding visual area, and each corresponding pixel of each visual area constructs a corresponding pixel set of the visual area;
the orthogonal detector (40) is formed by arranging orthogonal detection units, each orthogonal detection unit is arranged at each grating unit of the grating (20) in a one-to-one correspondence manner and corresponds to the pixel group corresponding to the corresponding grating unit, and each orthogonal detection unit only allows light with one corresponding orthogonal characteristic to pass through and simultaneously blocks light beams with other non-corresponding orthogonal characteristics;
the orthogonal generator (30) is arranged at the pixel array (10) and is formed by arranging orthogonal generating units, each orthogonal generating unit corresponds to each orthogonal detecting unit of the orthogonal detector (40) one by one, and each grating unit corresponding to the orthogonal detecting unit corresponds to each pixel group, so that the pixel emergent beam of the corresponding pixel group is restrained to have corresponding orthogonal characteristics after passing through the orthogonal generating unit;
wherein each grating unit allows the projection light of the corresponding pixel group to pass through, but blocks the projection light of the pixel group corresponding to the adjacent grating unit,
when the grating units are arranged in two dimensions, the orthogonal characteristic is the combination of the polarization characteristic and the time sequence characteristic, so that the blocking of the projection light of the pixel group corresponding to the adjacent grating units by each grating unit is realized.
2. A near-eye light field display module based on an orthogonal characteristic grating-pixel array pair, comprising the orthogonal characteristic grating-pixel array pair of claim 1, and:
a projection device (50) which projects a pixel virtual image of each pixel of the pixel array (10) to a corresponding projection surface (11) after being arranged in a grating-pixel array pair along the transmission direction of the emergent light beam of the pixel array (10), constructs a pixel array virtual image (10 '), projects a grating unit virtual image of each grating unit of the grating (20) to a corresponding projection surface (21), constructs a grating virtual image (20'), and projects an image of each generated visual area to the vicinity of an effective visual area surface (51), wherein the image of each visual area is named as an effective visual area, and the adjacent interval of the effective visual area is smaller than or equal to the diameter D of the pupil (70) of an observer p ；
And the control device (80) controls each pixel to load corresponding light information, wherein the corresponding light information of each pixel is projection information of a scene to be displayed on the virtual image of the pixel with respect to the effective view area corresponding to the pixel.
3. The near-eye light field display module of claim 2, wherein when the grating units are arranged in two dimensions, the orthogonal characteristics are polarization characteristics with polarization directions perpendicular to each other and time sequence characteristics of non-simultaneous light transmission, or the polarization directions are polarization characteristics with left and right directions and time sequence characteristics of non-simultaneous light transmission, respectively.
4. A near-eye light field display module based on orthogonal characteristic grating-pixel array pairs according to claim 2, characterized in that the projection device (50) is an optical device with imaging functionality.
5. The near-eye light field display module set based on the orthogonal grating-pixel array pair according to claim 4, wherein the projection device (50) is a lens, a lens group, a phase plate device, a grating device or a liquid crystal device having an imaging function.
6. The near-eye optical field display module set based on the orthogonal grating-pixel array pair according to claim 4, wherein the projection device (50) is an optical device with time-varying focusing capability;
the near-eye light field display module of the orthogonal characteristic grating-pixel array pair is arranged to be capable of forming a plurality of projection surfaces and corresponding effective visual areas in a time sequence at different depths, when each projection surface is projected to different depths, a control device (80) synchronously loads corresponding information to each pixel, wherein the corresponding information is projection information of a scene to be displayed on a virtual image of a corresponding pixel of the projection surface relative to the effective visual area of the pixel, and the depth of field of the displayed scene is improved based on visual retention;
or the display information of the projection plane closest to the depth is synchronously driven by a control device (80) by tracking the binocular convergence depth of an observer in real time, and the virtual image of each pixel on the projection plane corresponds to the pixel loading information, so that the projection information of a scene to be displayed on the virtual image of the pixel corresponding to the effective visual area is used for improving the display depth of field.
7. The near-eye light field display module set based on the orthogonal characteristic grating-pixel array pair according to claim 6, wherein the projection device (50) is a liquid crystal lens with controllable focal length time sequence or a composite liquid crystal lens formed by superposing a plurality of liquid crystal wafers, different combinations of liquid crystal wafers in the composite liquid crystal lens can generate different focusing capacities, and different time sequence focal lengths are realized by driving different combinations of liquid crystal wafers in time sequence.
8. A near-eye light field display module based on orthogonal characteristic grating-pixel array pairs according to claim 2, further comprising a relay device (60) placed adjacent to the projection device (50) for directing light beams from the pixel array (10) towards the observer's pupil (70).
9. The near-eye optical field display module set based on the orthogonal grating-pixel array pair according to claim 8, wherein the relay device (60) is a beam deflector that changes a propagation direction of the beam.
10. The near-eye light field display module set based on the orthogonal characteristic grating-pixel array pair according to claim 9, wherein the relay device (60) is a mirror or a half mirror.
11. The near-eye optical field display module set based on the orthogonal characteristic grating-pixel array pair according to claim 8, wherein the relay device (60) is an optical path folding structure capable of shortening a spatial distance between the orthogonal characteristic grating-pixel array pair and the projection device (50).
12. The near-eye light field display module set of claim 11, wherein the light path folding structure comprises: a selective reflection-transmission mirror (601), an optical characteristic adjustment sheet (602) and a reflection sheet (603), wherein the selective reflection-transmission mirror (601) respectively reflects and transmits light beams having different optical characteristics, defines transmission corresponding optical characteristics as transmission characteristics, and reflection corresponding optical characteristics as reflection characteristics;
wherein the positional relationship between the selective reflection-transmission mirror (601), the optical characteristic adjustment sheet (602), and the reflection sheet (603) is set so as to satisfy the following condition: the reflected characteristic light beam is reflected after being firstly incident on the selective reflection-transmission mirror (601), is reflected again by the reflecting sheet (603) after being once incident on the optical characteristic modulation sheet (602), is incident on the optical characteristic modulation sheet (602) again, and is converted into transmission characteristic from reflection characteristic after being passed through the optical characteristic modulation sheet (602) twice, and is continuously transmitted to the region where the pupil (50) of the observer is located after being transmitted through the selective reflection-transmission mirror (601).
13. The near-eye light field display module set based on the orthogonal characteristic grating-pixel array pair according to claim 12, wherein the reflecting sheet (603) is a reflecting mirror or a half-mirror, and the reflection characteristic and the transmission characteristic are two linear polarization states with mutually perpendicular polarization directions.
14. The near-eye optical field display module of claim 12, wherein the optical path folding structure further comprises a polarization pre-adjustment sheet (604) for modulating the light beam from the orthogonal grating-pixel array to first enter the selective reflection-transmission mirror (601) in reflection.
15. The near-eye light field display module set of claim 11, wherein the light path folding structure comprises: a selective reflection-transmission mirror (601), a first optical characteristic adjustment sheet (602 a) and a second optical characteristic adjustment sheet (602 b), a first reflection sheet (603 a) and a second reflection sheet (603 b), wherein the selective reflection-transmission mirror (601) respectively reflects and transmits light beams having different optical characteristics, defines transmission corresponding optical characteristics as transmission characteristics, and reflection corresponding optical characteristics as reflection characteristics;
wherein the selective reflection-transmission mirror (601), the first optical characteristic adjustment sheet (602 a) and the second optical characteristic adjustment sheet (602 b), the positional relationship between the first reflection sheet (603 a) and the second reflection sheet (603 b) is set to satisfy the following condition: the light beam with reflection characteristic is reflected after being obliquely incident to the selective reflection-transmission mirror (601) for the first time, then is reflected by the second reflection sheet (603 b) again after passing through the second optical characteristic modulation sheet (602 b) for the first time, and is incident to the second optical characteristic modulation sheet (602 b) again, the light beam passing through the second optical characteristic modulation sheet (602 b) for the second time, the corresponding optical characteristic is converted from reflection characteristic to transmission characteristic, and then is transmitted to the selective reflection-transmission mirror (601) and then is continuously transmitted to the region where the pupil (50) of an observer is positioned; the light beam with transmission characteristics is transmitted after being obliquely incident to the selective reflection-transmission mirror (601) for the first time, is reflected by the first reflection sheet (603 a) again after being reflected by the first optical characteristic modulation sheet (602 a) for the first time, is incident to the first optical characteristic modulation sheet (602 a) again, and is converted into reflection characteristics from transmission characteristics after passing through the second optical characteristic modulation sheet (602 b) for the second time, and is continuously transmitted to the region where the pupil (50) of the observer is located after being reflected by the selective reflection-transmission mirror (601).
16. The near-eye optical field display module set of claim 11, wherein the optical path folding structure is a medium having a refractive index greater than air interposed between the orthogonal grating-pixel array pair and the projection device (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911045789.1A CN112748570B (en) | 2019-10-30 | 2019-10-30 | Orthogonal characteristic grating-pixel array pair and near-eye light field display module based on same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911045789.1A CN112748570B (en) | 2019-10-30 | 2019-10-30 | Orthogonal characteristic grating-pixel array pair and near-eye light field display module based on same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112748570A CN112748570A (en) | 2021-05-04 |
| CN112748570B true CN112748570B (en) | 2023-11-10 |
Family
ID=75640583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911045789.1A Active CN112748570B (en) | 2019-10-30 | 2019-10-30 | Orthogonal characteristic grating-pixel array pair and near-eye light field display module based on same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112748570B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835233B (en) * | 2021-08-26 | 2023-08-01 | 中山大学 | Thin display structure for emergent dynamic directional light beam |
| CN117970642A (en) * | 2022-06-20 | 2024-05-03 | 中山大学 | Near-to-eye display module based on orthogonal characteristic pixel blocks |
| CN116338975B (en) * | 2023-05-30 | 2023-07-28 | 成都工业学院 | Stereoscopic display device based on display bar array |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020573A (en) * | 2014-06-04 | 2014-09-03 | 四川大学 | Multi-view 3D display device based on cross-polarization directional backlight source |
| CN107505720A (en) * | 2017-09-14 | 2017-12-22 | 北京邮电大学 | A kind of 3 d light fields display device based on cross-polarization |
| CN206892470U (en) * | 2017-03-31 | 2018-01-16 | 华侨大学 | Compact column mirror grating formula bore hole 3D display panel |
| CN207067548U (en) * | 2017-04-11 | 2018-03-02 | 成都工业学院 | Integration imaging 3D display device based on polarization grating and microlens array |
| WO2018121642A1 (en) * | 2016-12-29 | 2018-07-05 | 中山大学 | System and method for improving resolution of view displayed by raster 3d display |
| CN108627991A (en) * | 2018-08-13 | 2018-10-09 | 成都工业学院 | Double vision 3D display device and method based on Lenticular screen |
| CN109683338A (en) * | 2019-02-21 | 2019-04-26 | 京东方科技集团股份有限公司 | A kind of light field display device and method |
| CN109765695A (en) * | 2019-03-29 | 2019-05-17 | 京东方科技集团股份有限公司 | A kind of display system and display device |
-
2019
- 2019-10-30 CN CN201911045789.1A patent/CN112748570B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020573A (en) * | 2014-06-04 | 2014-09-03 | 四川大学 | Multi-view 3D display device based on cross-polarization directional backlight source |
| WO2018121642A1 (en) * | 2016-12-29 | 2018-07-05 | 中山大学 | System and method for improving resolution of view displayed by raster 3d display |
| CN206892470U (en) * | 2017-03-31 | 2018-01-16 | 华侨大学 | Compact column mirror grating formula bore hole 3D display panel |
| CN207067548U (en) * | 2017-04-11 | 2018-03-02 | 成都工业学院 | Integration imaging 3D display device based on polarization grating and microlens array |
| CN107505720A (en) * | 2017-09-14 | 2017-12-22 | 北京邮电大学 | A kind of 3 d light fields display device based on cross-polarization |
| CN108627991A (en) * | 2018-08-13 | 2018-10-09 | 成都工业学院 | Double vision 3D display device and method based on Lenticular screen |
| CN109683338A (en) * | 2019-02-21 | 2019-04-26 | 京东方科技集团股份有限公司 | A kind of light field display device and method |
| CN109765695A (en) * | 2019-03-29 | 2019-05-17 | 京东方科技集团股份有限公司 | A kind of display system and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112748570A (en) | 2021-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7057824B2 (en) | Multiple imaging arrangements for head mounted displays | |
| WO2017150631A1 (en) | Head Mounted Display Using Spatial Light Modulator To Move the Viewing Zone | |
| CN112748570B (en) | Orthogonal characteristic grating-pixel array pair and near-eye light field display module based on same | |
| CN101937133B (en) | Projection-type display apparatus | |
| AU2017258032B2 (en) | Three-dimensional display system based on division multiplexing of viewer's entrance-pupil and display method thereof | |
| US5726800A (en) | Autostereoscopic directional display apparatus | |
| US20080231952A1 (en) | Highly efficient 2d/3d switchable display device | |
| CA2065762C (en) | Three-dimensional image display apparatus | |
| WO2021062941A1 (en) | Grating-based optical waveguide light field display system | |
| US11480796B2 (en) | Three-dimensional display module using optical wave-guide for providing directional backlights | |
| TW201641990A (en) | Display device, in particular a head-mounted display | |
| EP1723802A1 (en) | Multiple imaging arrangements for head mounted displays | |
| JPH10142557A (en) | Display device | |
| CN107367845A (en) | Display system and display methods | |
| US11714283B2 (en) | Optical apparatus and near-eye display apparatus including the same | |
| CN112305776B (en) | Light field display system based on light waveguide coupling light exit pupil segmentation-combination control | |
| US11933994B2 (en) | System and method for aperture extension and programmable optical depth modulation via a field evolving cavity | |
| CN112882248A (en) | Display module assembly of light beam divergence angle deflection aperture secondary restraint | |
| CN114600035A (en) | Pupil matched optical see-through head mounted display with occlusion capability | |
| KR20070015366A (en) | Display device for volumetric imaging using a birefringent optical path length adjuster | |
| CN113359312B (en) | Optical waveguide display module based on multiple light sources | |
| JP2001215441A (en) | Image observation device | |
| WO2021016761A1 (en) | Light field display system based on control over splitting-combination of outcoupling light exit pupil of optical waveguide | |
| JPH1043382A (en) | Image displaying device for pinball machine | |
| US20230418068A1 (en) | Anamorphic directional illumination device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |