CN114488527A - Optical film and optical imaging system - Google Patents
Optical film and optical imaging system Download PDFInfo
- Publication number
- CN114488527A CN114488527A CN202011150172.9A CN202011150172A CN114488527A CN 114488527 A CN114488527 A CN 114488527A CN 202011150172 A CN202011150172 A CN 202011150172A CN 114488527 A CN114488527 A CN 114488527A
- Authority
- CN
- China
- Prior art keywords
- layer
- light beam
- optical film
- microstructure
- image
- 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.)
- Pending
Links
- 239000012788 optical film Substances 0.000 title claims abstract description 67
- 238000012634 optical imaging Methods 0.000 title claims abstract description 18
- 239000013598 vector Substances 0.000 claims abstract description 13
- 239000010408 film Substances 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 238000002310 reflectometry Methods 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- -1 polyethylene terephthalate Polymers 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 description 16
- 238000003384 imaging method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000002834 transmittance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
Images
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
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Instrument Panels (AREA)
Abstract
The application discloses an optical film and an optical imaging system, wherein the optical film is attached to a windshield and at least comprises a phase offset layer, a reflecting layer and a microstructure layer which are sequentially stacked; the reflecting layer is used for reflecting the image light beam to form a first reflected light beam; the phase cancellation layer is used for amplifying and/or deflecting the second reflected light beam so as to guide the second reflected light beam to the second emergent direction; the normal vector of the microstructure layer faces a first emergent direction, and the microstructure layer is used for guiding the first reflected light beam to the first emergent direction; the phase cancellation layer is used for canceling out phase difference generated by the light beam passing through the microstructure layer; the second reflected light beam is formed by reflecting an image light beam by the windshield, and the first emergent direction is different from the second emergent direction. Through the mode, the virtual image can be directly formed when the optical film is attached to the surface of the windshield, and double images can be eliminated.
Description
Technical Field
The application relates to the technical field of display, in particular to an optical film and an optical imaging system.
Background
The Head-Up Display (HUD) can transmit useful driving information to a windshield to generate a remote virtual image, so that the driving safety is improved, and the risk caused by the fact that the sight of a driver leaves the road surface is reduced.
The existing HUD solution is to use the windshield as the final optical surface for imaging, and implement image amplification and imaging through a series of specular reflection; because the windshield does not have a good amplification imaging function, an imaging group is realized by one or two free-form surface reflectors, as shown in fig. 1, and meanwhile, the rotation angle of the free-form surface reflectors is required to be adjusted to match the heights of different drivers; because a plurality of free-form surface reflectors occupy a certain space and need to be installed below a windshield, the existing method is to implant the free-form surface reflectors into the position of an instrument panel below the windshield, but the direct utilization of the windshield for imaging has many defects, including double images generated on the front and rear surfaces, the need of a plurality of free-form surface reflectors for building a light path, the occupation of the space in the instrument panel of an automobile and the like; as shown in fig. 2, light beams incident on the windshield are reflected on two surfaces of the windshield, respectively, to generate a far virtual image 2 and a near virtual image 1, respectively, and the viewing effect is affected by the overlapping of the two virtual images.
Disclosure of Invention
The application provides an optical film and optical imaging system can make the laminating of optical film directly form the virtual image when windshield surface, can also eliminate the ghost image.
In order to solve the technical problem, the technical scheme adopted by the application is as follows: providing an optical film, wherein the optical film is attached to a windshield and at least comprises a phase offset layer, a reflecting layer and a microstructure layer which are sequentially stacked; the reflecting layer is used for reflecting the image light beam to form a first reflected light beam; the phase cancellation layer is used for amplifying and/or deflecting the second reflected light beam so as to guide the second reflected light beam to the second emergent direction; the normal vector of the microstructure layer faces to a first emergent direction, and the microstructure layer is used for guiding the first reflected light beam to the first emergent direction; the phase cancellation layer is used for canceling out phase difference generated by the light beam passing through the microstructure layer; the second reflected light beam is formed by reflecting an image light beam by the windshield, and the first emergent direction is different from the second emergent direction.
In order to solve the technical problem, the technical scheme adopted by the application is as follows: the optical imaging system comprises an optical film and an image generator, wherein the image generator is used for generating an image light beam and emitting the image light beam into the optical film, the optical film is used for reflecting the image light beam to a first emitting direction to form a virtual image and guiding the image light beam reflected by a windshield to a second emitting direction, and the optical film is the optical film.
Through the scheme, the beneficial effects of the application are that: when the optical film is attached to the surface of the windshield, a virtual image can be formed through the reflecting layer in the optical film, and an image beam can be imaged without an additional optical imaging device and presented to human eyes; meanwhile, the image light beams reflected by the reflecting layer are guided to the first emergent direction, and the image light beams reflected by the windshield are guided to the second emergent direction, so that a virtual image formed by the image light beams reflected by the windshield and a virtual image formed by the image light beams reflected by the reflecting layer can be distinguished, double images caused by partial overlapping of the two virtual images are eliminated, and the virtual images are conveniently observed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic diagram of the optical path for implementing a HUD scheme in the prior art;
FIG. 2 is a schematic diagram of prior art implementation of image ghosting in a HUD scheme;
FIG. 3 is a schematic diagram of the layer structure of an optical film in one embodiment provided herein;
FIG. 4 is a schematic view of the optical path of the imaging in the embodiment shown in FIG. 3;
FIG. 5 is a schematic representation of the layer structure of an optical film in another embodiment provided herein;
FIG. 6(a) is a schematic diagram of the microstructure units of the embodiment shown in FIG. 5 arranged in a quadrilateral shape;
FIG. 6(b) is a schematic diagram of the embodiment of FIG. 5 in which the microstructure elements are arranged in a hexagonal pattern;
FIG. 7 is a schematic view of the optical path of the imaging in the embodiment shown in FIG. 5;
FIG. 8 is a graphical representation of the reflectance versus transmittance curves for the embodiment shown in FIG. 5;
FIG. 9 is another schematic illustration of the optical path of the imaging in the embodiment shown in FIG. 5;
FIG. 10 is a schematic diagram of an embodiment of an optical imaging system provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The application provides an optical film imaging device, which can be attached to the inner side of an automobile windshield to realize HUD display, and does not need to be matched with other positions of an automobile, so that the occupied space of the HUD is saved, and the installation process is simplified; in addition, the optical thin film imaging device that this application provided can overcome prior art and has the problem of image ghost image when realizing the HUD, has promoted user's visual perception.
Referring to fig. 3 and 4, fig. 3 is a schematic diagram of a layer structure of an optical film according to an embodiment of the present disclosure, and fig. 4 is a schematic diagram of an imaging optical path according to the embodiment shown in fig. 3.
The optical film 10 includes a microstructure layer 11 and a reflective layer 12, the optical film 10 is attached to the windshield 20 through the microstructure layer 11, as shown in fig. 4, and the image generator 30 is configured to generate an image beam to form a virtual image.
In order to ensure that the light beam transmitted through the microstructure layer 11 is not affected by the shape of the microstructure layer 11, a phase cancellation layer 13 may be fabricated, the phase cancellation layer 13 may cancel out a phase difference generated when the light beam passes through the microstructure layer 11, specifically, the phase cancellation layer 13 and the microstructure layer 11 have the same refractive index, and the phase cancellation layer 13 and the microstructure layer 11 are rotationally symmetric structures to cancel out the phase difference generated when the light beam passes through the microstructure layer 11, that is, the optical film 10 at least includes the microstructure layer 11, the reflective layer 12 and the phase cancellation layer 13 which are sequentially stacked.
The image beam emitted from the image generator 30 enters the phase canceling layer 13 of the optical film 10, passes through the phase canceling layer 13, and reaches the reflective layer 12.
The reflective layer 12 is configured to reflect the image light beam emitted from the phase cancellation layer 13 to form a first reflected light beam, where the first reflected light beam passes through the phase cancellation layer 13 and then is emitted along a first emission direction, and the emitted first reflected light beam forms a first virtual image in a direction opposite to the first emission direction; the microstructure layer 11 may guide the first reflected light beam to the first exit direction, and a normal vector of the microstructure layer 11 faces the first exit direction.
Further, in order to ensure that the optical film 10 does not affect the light transmittance of the windshield 20 when attached to the windshield 20, the reflective layer 12 is a semi-transparent and semi-reflective metal film or dielectric film. Therefore, the reflective layer 12 can transmit a part of the image light, which can be incident to the windshield 20 through the microstructure layer 11, and the part of the image light forms a second reflected beam after being reflected by the windshield 20, and the phase cancellation layer 13 can amplify and/or deflect the second reflected beam to be guided to the second exit direction; specifically, the second reflected light beam sequentially passes through the microstructure layer 11, the reflective layer 12 and the phase cancellation layer 13 and then exits from the optical film 10, a second virtual image is formed in the second reflected light beam in the opposite direction of the second exiting direction, and the first exiting direction is different from the second exiting direction, so that the first virtual image and the second virtual image can be distinguished.
Since the windshield 20 has a certain thickness, part of the image light transmitted to the windshield 20 through the reflective layer 12 is reflected by both surfaces of the windshield 20 to form two second virtual images overlapping each other, as shown in fig. 4. In order to avoid the second virtual image and the first virtual image from overlapping each other and causing a ghost image, the optical film 10 may be designed such that the angle at which the optical film 10 reflects the image light beam and the angle at which the windshield 20 reflects the image light beam are separated; preferably, the second virtual image formed by the second reflected light beam can be made inaccessible to the human sight.
The phase canceling layer 13 in the optical film 10 provided in this embodiment can cancel out the phase difference caused by the microstructure layer 11, the optical film 10 directly forms a virtual image when being attached to the surface of the windshield 20, and the image light beam generated by the image generator 30 can be changed into an enlarged virtual image without an additional optical imaging device, and the enlarged virtual image is presented on the outer side of the windshield 20, and the virtual image can be overlapped with the real scene of the road, so as to better meet the requirements of users on road navigation and information prompt; and because the angle that the image light beam is reflected by optical film 10 and the angle that the image light beam is reflected by windshield 20 can distinguish, the first virtual image that first reflected light beam produced and the second virtual image district that the second reflected light beam produced can be distinguished to the people's eye to eliminate the ghost image, conveniently observe the virtual image.
Referring to fig. 4 and 5, fig. 5 is a schematic diagram of a layer structure of an optical film according to another embodiment of the present disclosure, which is different from the previous embodiment: in this embodiment, the optical film 10 further includes a first substrate 14 and a second substrate 15, the first substrate 14 is disposed on a side of the microstructure layer 11 away from the reflective layer 12, and the second substrate 15 is disposed on a side of the phase cancellation layer 13 away from the reflective layer 12.
The first substrate 14 and the second substrate 15 may be made of hard substrates such as glass or acrylic, or soft flexible substrates such as PET (Polyethylene Terephthalate) or PC (Polycarbonate); specifically, the substrate surface may be coated with a curable resin material, such as an acrylic or polyurethane resin cured by UV (ultraviolet) or heat, and the substrate (including the first substrate 14 and the second substrate 15) may be manufactured by the imprinting process of the master mold.
In order to make the angle at which the optical film 10 reflects the image beam and the angle at which the windshield 20 reflects the image beam distinguishable, the microstructure layer 11 and the phase cancellation layer 13 may be designed.
Further, the microstructure layer 11 includes a plurality of forward microstructure units, the phase cancellation layer 13 includes a plurality of reverse microstructure units, the plurality of forward microstructure units and/or the plurality of reverse microstructure units are arranged in an array (i.e. arranged in an array form), and the reverse microstructure units and the forward microstructure units are complementary structures to cancel out phase differences brought by the forward microstructure units; the reflective layer 12 at least partially covers the surfaces of the forward microstructure units and the reverse microstructure units.
The microstructure units (including the forward microstructure unit and the reverse microstructure unit) have an optical surface which is a plane, each microstructure unit has a normal vector which is perpendicular to the optical surface of the microstructure unit, the normal vector is set to face the first exit direction, and a virtual image formed by an image light beam reflected by the reflection layer 12 can be distinguished from a virtual image formed by an image light beam reflected by the windshield 20 by adjusting the direction of the normal vector, so that the normal vectors of the microstructure units need to be calculated, specifically, calculation can be performed according to the directions of the incident image light beam and the exit image light beam.
Further, the image generator 30 includes a plurality of light emitting units, in order to distinguish virtual images, the reflection angle of the optical film 10 and the reflection angle of the windshield 20 may be set first, then a preset number of light emitting units are selected as reference light emitting units in the image generator 30, under the condition that the thickness and the material of each film layer of the optical film 10 are not changed, the position of a virtual image point formed by each reference light emitting unit is calculated in a simulation manner, and by adjusting the inclination angle of the optical surface of each microstructure unit, the normal vector of each optical surface satisfying the condition of no ghost image generation may be finally obtained.
In a specific embodiment, a predetermined number of reference light-emitting units can be uniformly selected to ensure that the image generator 30 has a relatively uniform imaging effect; for example, as shown in fig. 7, the preset number is 2, two reference light emitting units P1 and P2 are selected, normal vectors of the respective microstructure units when no ghost image is generated can be obtained through simulation calculation, the optical film 10 attached to the windshield 20 can reflect the image light beam generated by the image generator 30 to form a virtual image, the reference light emitting unit P1 corresponds to the virtual image point I1, and the reference light emitting unit P2 corresponds to the virtual image point I2.
When the microstructure units are manufactured, a carving machine can be used for machining or mask exposure technology and other modes to manufacture a mother board of the microstructure units; after the mother board is manufactured, batch production can be carried out through a plurality of modes such as stamping, injection molding or roll-to-roll forming process.
The microstructure units may have polygonal boundaries, and specifically, the cross-sectional shape of the forward microstructure unit may be a triangle, a quadrangle, a hexagon, or the like, as shown in fig. 6(a), the cross-section of the microstructure unit is a quadrangle, and the normal vector of the microstructure unit is perpendicular to the optical surface of the quadrangle, or as shown in fig. 6(b), the cross-section of the microstructure unit is a hexagon, and the normal vector of the microstructure unit is perpendicular to the optical surface of the hexagon.
It is understood that the cross-sectional shape of the microstructure units does not affect the optical imaging effect, and the shape of the microstructure units can be set as desired.
Because the image light beam incident to the optical surface needs to be reflected geometrically and optically as much as possible, and the diffraction effect caused by the limited edge is reduced, the minimum envelope size of the microstructure unit needs to be more than 10 times larger than the light wave size of visible light, and the minimum envelope diameter of the microstructure unit is more than 10 μm in the case that the light wave size is 1000 nm; considering that the larger the size of the microstructure unit is, the more serious the pixelation of the displayed image is, and the approximation degree of the microstructure unit to the curved surface is reduced, so that the attaching degree to the windshield 20 is reduced, and the visual effect of imaging is affected, therefore, the minimum envelope diameter of the microstructure unit can be set to be less than 500 μm, that is, the envelope diameter of the microstructure unit is 10-500 μm, wherein the diameter of the minimum envelope can refer to the diameter of a circumscribed circle of the microstructure unit. It should be noted that the minimum envelope diameter is not limited to a fixed range, i.e., the minimum envelope diameter may be less than 10 μm or greater than 500 μm when the above conditions (reduced edge diffraction effect, high adhesion to windshield 20) are satisfied.
After the microstructure layer 11 is manufactured by using a motherboard, a reflection layer 12 can be manufactured on the optical surface of the microstructure layer 11, the reflection layer 12 covers the optical surface of the forward microstructure unit, the reflection layer 12 can be a metal film or a dielectric film, in order to enable the reflection layer 12 to reflect the image light beam and transmit the image light beam to form a virtual image, the reflectivity of the reflection layer 12 is 10% -30%, and the transmissivity of the reflection layer 12 is 40% -80%; specifically, a semi-transparent and semi-reflective metal film or dielectric film may be plated on the surface of the microstructure layer 11, and as can be seen from the graph of the reflectivity and transmittance of the metal film shown in fig. 8, a more desirable transmittance may be obtained when the reflectivity is controlled in the range of 10% to 30%.
In other embodiments, in order to facilitate the human eyes to observe a plurality of pieces of information, the optical film 10 may be designed to display virtual images at different positions, some of the virtual images being imaged at a near position, some of the virtual images being imaged at a far position, for example, information of low-speed driving may be displayed at the near position, and information of high-speed driving may be displayed at the far position; specifically, the microstructure units may be designed such that the inclination angles or positions of the microstructure units are adjusted such that the same image light beam is incident on the optical film 10 to form virtual images at different distances, for example, as shown in fig. 9, the optical film 10 attached to the windshield 20 reflects the image light beam generated by the image generator 30 to form virtual images at different distances, the reference light emitting unit P1 on the image generator 30 corresponds to the virtual image point I1, the reference light emitting unit P2 on the image generator 30 corresponds to the virtual image point I2, the reference light emitting unit P3 on the image generator 30 corresponds to the virtual image point I3, the virtual image point I1 and the virtual image point I2 are farther from the observer, the virtual image point I3 is closer to the observer, and the size of the virtual image point I1 and the virtual image point I2 is larger than the size of the virtual image point I3.
The optical film 10 provided by the embodiment is formed by attaching the positive microstructure unit and the negative microstructure unit, the negative microstructure unit has the same structure as the positive microstructure unit and has the opposite direction to the positive microstructure unit, the optical film 10 with uniform thickness is formed, reflection of image light beams at a specific angle can be realized by controlling the direction of a normal vector of each microstructure unit, so as to eliminate double images, the optical film 10 can be attached to the surface of a windshield window for direct imaging, and an image displayed by the image generator 30 can be an amplified virtual image without an additional optical imaging device, and the amplified virtual image can be presented to human eyes.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of an optical imaging system provided in the present application, where the optical imaging system 100 includes an optical film 10 and an image generator 30, the image generator 30 is configured to generate an image light beam and inject the image light beam into the optical film 10, the optical film 10 is configured to reflect the image light beam to a first exit direction to form a first virtual image in a direction opposite to the first exit direction, and transmit the image light beam reflected by a windshield to a second exit direction to form a second virtual image in the direction opposite to the second exit direction, where the optical film 10 is the optical film in the above embodiment, and the first exit direction is different from the second exit direction, so that the first virtual image and the second virtual image can be distinguished.
The optical film 10 includes at least one area film, and virtual images formed by the image light beams reflected by each area film are located at different distances and do not overlap with each other, wherein the farther the virtual image is, the larger the virtual image is.
Further, the optical imaging system 100 is a HUD system in which the content of the image generator 30 can be imaged to a virtual image position at the same distance, part of the content is also presented at a far distance, and part of the content is presented at a near distance, as shown in fig. 9, a part of the image beams generated by the reference light emitting units in the image generator 30 are used to form a virtual image at a near distance, and another part of the image beams generated by the reference light emitting units are used to form a virtual image at a far distance, and for the sake of observation, the virtual image at a far distance is larger in size and has a higher magnification than the virtual image at a near distance.
When the optical film 10 in the optical imaging system 100 provided by this embodiment is attached to the surface of a windshield to serve as a HUD screen, a virtual image can be directly formed, and an image light beam generated by the image generator 30 can be imaged without an additional optical imaging device and presented to human eyes; the first virtual image and the second virtual image which are generated simultaneously are not overlapped with each other, so that human eyes can distinguish the virtual images, and therefore double images can be eliminated; the system is simple in structure, does not need to occupy extra space in the vehicle, increases installation convenience and operation convenience, and can reduce the cost of the system.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (10)
1. An optical film is characterized in that the optical film is attached to a windshield and at least comprises a phase offset layer, a reflecting layer and a microstructure layer which are sequentially stacked;
the reflecting layer is used for reflecting the image light beam to form a first reflected light beam; the phase cancellation layer is used for amplifying and/or deflecting the second reflected light beam so as to guide the second reflected light beam to the second emergent direction; the normal vector of the microstructure layer faces to a first emergent direction, and the microstructure layer is used for guiding the first reflected light beam to the first emergent direction; the phase cancellation layer is used for canceling out phase difference generated by the light beam passing through the microstructure layer;
the second reflected light beam is formed by reflecting the image light beam by the windshield, and the first emergent direction and the second emergent direction are different.
2. An optical film as recited in claim 1,
the phase offset layer and the microstructure layer have the same refractive index, and are of rotationally symmetrical structures.
3. An optical film as recited in claim 2,
the phase cancellation layer comprises a plurality of forward microstructure units, the microstructure layer comprises a plurality of reverse microstructure units, and the forward microstructure units and the reverse microstructure units are of complementary structures.
4. An optical film as recited in claim 3,
the enveloping diameters of the forward microstructure units and the reverse microstructure units are 10-500 mu m, and the forward microstructure units/the reverse microstructure units are arranged in an array form.
5. An optical film as recited in claim 3,
the reflection layer at least partially covers the surfaces of the forward microstructure units and the reverse microstructure units, and the cross sections of the forward microstructure units and the reverse microstructure units are triangular, quadrangular or hexagonal.
6. The optical film according to claim 1,
the optical film further comprises a first base material and a second base material, the first base material is arranged on one side, away from the reflecting layer, of the phase cancellation layer, and the second base material is arranged on one side, away from the reflecting layer, of the microstructure layer.
7. An optical film as recited in claim 6,
the material of the first substrate and the second substrate comprises glass, acrylic, polyethylene terephthalate or polycarbonate.
8. An optical film as recited in claim 1,
the reflecting layer is a metal film or a dielectric film, the reflectivity of the reflecting layer is 10% -30%, and the transmissivity of the reflecting layer is 40% -80%.
9. An optical imaging system comprising an optical film and an image generator, wherein the image generator is configured to generate an image light beam and to emit the image light beam into the optical film, and the optical film is configured to reflect the image light beam in a first emission direction to form a virtual image and to guide the image light beam reflected by a windshield in a second emission direction, and wherein the optical film is the optical film according to any one of claims 1 to 8.
10. The optical imaging system of claim 9,
the optical film comprises at least one area film, virtual images formed by image light beams reflected by the area films are located at different distances and do not overlap with each other, and the virtual images are larger as the virtual images are farther.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150172.9A CN114488527A (en) | 2020-10-23 | 2020-10-23 | Optical film and optical imaging system |
| PCT/CN2021/117170 WO2022083337A1 (en) | 2020-10-23 | 2021-09-08 | Optical film and optical imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150172.9A CN114488527A (en) | 2020-10-23 | 2020-10-23 | Optical film and optical imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114488527A true CN114488527A (en) | 2022-05-13 |
Family
ID=81291614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011150172.9A Pending CN114488527A (en) | 2020-10-23 | 2020-10-23 | Optical film and optical imaging system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114488527A (en) |
| WO (1) | WO2022083337A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632759A (en) * | 2019-09-24 | 2019-12-31 | 上海影创信息科技有限公司 | Augmented reality optical system and processing method |
| US20210072632A1 (en) * | 2018-05-25 | 2021-03-11 | AGC Inc. | Image projection structure, method for manufacturing same, and image display system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7656585B1 (en) * | 2008-08-19 | 2010-02-02 | Microvision, Inc. | Embedded relay lens for head-up displays or the like |
| JP2013127489A (en) * | 2010-03-29 | 2013-06-27 | Panasonic Corp | See-through display |
| CN106483664B (en) * | 2016-12-22 | 2023-08-04 | 深圳点石创新科技有限公司 | Head-up display device and vehicle with same |
| FR3062339B1 (en) * | 2017-01-31 | 2022-07-22 | Saint Gobain | TRANSPARENT LAYERED ELEMENT WITH DIRECTIONAL DIFFUSE REFLECTION |
| WO2019225749A1 (en) * | 2018-05-25 | 2019-11-28 | Ａｇｃ株式会社 | Image projection structure, method for manufacturing same, and image display system |
| US20200124847A1 (en) * | 2018-10-17 | 2020-04-23 | Esteban Arboix | Head's up display with micro-optical combiner |
-
2020
- 2020-10-23 CN CN202011150172.9A patent/CN114488527A/en active Pending
-
2021
- 2021-09-08 WO PCT/CN2021/117170 patent/WO2022083337A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210072632A1 (en) * | 2018-05-25 | 2021-03-11 | AGC Inc. | Image projection structure, method for manufacturing same, and image display system |
| US11774841B2 (en) * | 2018-05-25 | 2023-10-03 | AGC Inc. | Image projection structure, method for manufacturing same, and image display system |
| CN110632759A (en) * | 2019-09-24 | 2019-12-31 | 上海影创信息科技有限公司 | Augmented reality optical system and processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022083337A1 (en) | 2022-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10802289B2 (en) | Virtual image display device | |
| KR940000091B1 (en) | Ghost-free automotive head-up display employing a wedged windshild | |
| US9448340B2 (en) | Embedded diffuser structure | |
| US20020021461A1 (en) | Holographic display device and method for producing a transmission diffusion hologram suitable for it | |
| US20200189363A1 (en) | Head up display device and image display apparatus therefor | |
| US20180329208A1 (en) | Light guide and virtual image display device | |
| CN114488527A (en) | Optical film and optical imaging system | |
| WO2020017591A1 (en) | Reflective screen and image display device | |
| JP2000249965A (en) | Information display device | |
| JP6027155B2 (en) | Transflective reflection sheet, display device | |
| JP2018163252A (en) | Light guide plate and display device | |
| JPWO2020110961A1 (en) | Reflective transparent screen and video display system | |
| CN215375953U (en) | Augmented reality head-up display device and vehicle | |
| CN111458869A (en) | Reflective transparent display device and application thereof | |
| JP6759618B2 (en) | Optical member, display device | |
| WO2023010743A1 (en) | Augmented reality head-up display apparatus, vehicle, and optical waveguide preparation method | |
| US20200124847A1 (en) | Head's up display with micro-optical combiner | |
| CN117148594B (en) | Display assembly and AR equipment | |
| CN112540461A (en) | Head-up display screen, head-up display subassembly and driving tool | |
| JP6147311B2 (en) | Transflective reflection sheet, display device | |
| JP6665566B2 (en) | Light guide plate and display device | |
| JP6733151B2 (en) | Display device | |
| WO2024111398A1 (en) | Image projection device | |
| CN220961914U (en) | Optical waveguide and head-up display system | |
| JP7373981B2 (en) | image display 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 |