CN217821128U - Multi-view floating projector - Google Patents
Multi-view floating projector Download PDFInfo
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- CN217821128U CN217821128U CN202221650840.9U CN202221650840U CN217821128U CN 217821128 U CN217821128 U CN 217821128U CN 202221650840 U CN202221650840 U CN 202221650840U CN 217821128 U CN217821128 U CN 217821128U
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Abstract
The utility model discloses a many visual angles float aerial projector contains a plurality of directive property light sources, display panel and formation of image concave mirror. The plurality of directional light sources project a plurality of directional light beams to illuminate the display panel to form a plurality of directional image light beams; the reflecting mirror reflects the directional image beams to the imaging concave mirror, and the plurality of directional image beams are reflected to a plurality of viewing areas with different viewing angles by the imaging concave mirror respectively to form a plurality of aerial projection real images. The plurality of directional light beams irradiate in almost the same area of the same display panel, or the plurality of directional image light beams irradiate in almost the same area of the same imaging concave mirror, and the plurality of viewing areas have larger visual angle difference.
Description
Technical Field
The utility model relates to a many visual angles float aerial projector utilizes the directive property light source of the different angles of multiunit to produce multichannel directive property image light beam, shares same formation of image concave mirror or same display panel, sees through the superficial empty real image that forms images concave mirror and throw out a plurality of visual angles, but reduce cost, reduce the usage space, improve image luminance, reduce the power consumption and generate heat.
Background
An automotive heads-up display includes a projector and a screen. The signal light source of the projector may be a Liquid Crystal Display (LCD) and the screen may be a (semi-) transparent screen or a windscreen. And the optical element inside the projector projects the signal light source to the screen, and the characters or images of the signal light source are displayed through the screen in a reflecting mode.
The signal light source is projected to the light path of the screen, and is usually provided with a concave mirror, and the signal light source is projected to the screen after being reflected and amplified by the concave mirror.
The focal length of the concave mirror is F, the distance between the object and the mirror surface is an object distance u, the distance between the imaging and the mirror surface is an image distance v, and the imaging principle of the concave mirror is as follows:
as shown in fig. 1A, when the object distance is greater than 2 times the focal distance, i.e., u >2F, the image is inverted, reduced real image, and the image is located between 2 times the focal distance and 1 times the focal distance in front of the concave mirror, i.e., F < v <2F. The larger the object distance, the smaller the real image.
As shown in fig. 1B, when the object distance is equal to 2 focal lengths, i.e., u =2F, the image is an inverted real image of the same size, and the image is located 2 focal lengths in front of the concave mirror, i.e., v =2F.
As shown in fig. 1C, when the object distance is between 1 focal length and 2 focal lengths, i.e., F < u <2F, the image is an inverted, magnified real image, and the image is located more than 2 focal lengths away from the concave mirror, i.e., v >2F, the closer the object is to the focal point, the larger the real image.
When the object distance is equal to 1 focal length, i.e. u = F, the rays of the object projected onto the concave mirror are parallel to each other after reflection, and the image is formed at infinity, i.e. v ≈ infinity.
As shown in fig. 1D, when the object distance is smaller than the focal length, i.e., u < F, the image is an erect and enlarged virtual image, the image is located behind the concave mirror, and the closer the object is to the focal point, the larger the virtual image.
As shown in fig. 2, when the distance between the display panel 2 displaying the erected image and the imaging concave mirror 3 is larger than 1 time of the focal length of the imaging concave mirror 3, the imaging concave mirror 3 reflects the projected image light at any point of the display panel 2 and then concentrates the projected image light at the imaging position. If the imaging position is located in front of the viewer, the viewer sees an inverted real image DR floating in the air. As shown in fig. 3, the erect image can be projected by displaying the inverted image on the display panel 2.
As shown in fig. 4, the projected image light of the display panel 2 may sequentially pass through the imaging concave mirror 3 and the windshield 4, and then be projected to the viewer. The optical elements of the projector may be hidden under the instrument desk, the viewer is allowed to see only the real image DR suspended in the vehicle.
The distance between the driver seat and the heads of two observers P1 and P2 of the passenger seat is about 60-100 cm, the horizontal line-of-sight distance between the eyes of the observers and the windshield is about 50-90 cm, and the projected real image is displayed on the inner side of the windshield and is closer to the observers than the windshield. As shown in fig. 5, in order to allow both the driver P1 and the passenger P2 to view the real image projection in the air, the projected image needs to have a wide viewing angle of approximately 60 to 100 degrees.
As shown in fig. 6A, the display panel 2 needs to be equipped with a large-area imaging concave mirror 3 to project the real image DR to the viewers P1 and P2 of the driver seat and the passenger seat simultaneously.
As shown in fig. 6B, under the above-mentioned setting, the brightness of the backlight 1 of the display panel 2 is evenly distributed to a wide viewing angle, which may result in insufficient brightness. If a high-power backlight is used, the backlight has the defects of energy consumption and high heat. The use of large-area imaging concave mirrors is not only expensive, but also increases the demand for installation space.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a multi-view floating projector.
The utility model provides a many visual angles float empty projector contains two directive property light sources, two display panel and an formation of image concave mirror. The two directional light sources correspond to the two display panels, each directional light source respectively projects a directional light beam, and each directional light beam illuminates an image displayed by the corresponding display panel to form a directional image light beam; the same imaging concave mirror reflects two directional image light beams and projects the two directional image light beams to two viewing areas respectively to form two floating projections. The two directional image beams are overlapped areas with the same or high proportion in the reflection area of the imaging concave mirror, and the visual angles of the two viewing areas have larger visual angle difference.
In addition, the directional imaging device further comprises two adjusting reflectors which are respectively arranged on the light path between the two display panels and the imaging concave mirror, and the two directional image beams are reflected by the two adjusting reflectors and then projected to the imaging concave mirror. The adjusting reflector is a concave mirror or a convex mirror.
Optionally, the number of the directional light sources exceeds two, the number of the display panels and the number of the adjusting reflectors are both the number of the corresponding directional light sources, each directional light beam illuminates an image of the corresponding display panel to become a directional image light beam, and the directional image light beam is reflected by the corresponding adjusting reflector and projected to the imaging concave mirror.
The utility model provides a many visual angles aerial projection ware again contains two directive property light sources, a display panel, two speculum and a formation of image concave mirror. The display panel switches images in a time-sharing manner to correspond to the two directional light sources, and the two directional light sources are synchronized with the time-sharing switching of the display panel. Each directional light source projects a directional light beam. Each directional light beam illuminates a corresponding image on the display panel to form a directional image light beam; two reflectors are arranged on a light path between the display panel and the imaging concave mirror and are plane mirrors, two directional light sources correspond to the two reflectors, two directional image light beams reflected by the two reflectors are converged to the same imaging concave mirror, the two directional image light beams reflected by the imaging concave mirror are projected to two viewing areas respectively, and two floating projections are formed. The two directional light beams are overlapped areas with the same or high proportion in the irradiation area of the same display panel, the two directional image light beams are overlapped areas with the same or high proportion in the reflection area of the same imaging concave mirror, and the visual angles of the two viewing areas have larger visual angle difference.
In addition, the two directional image beams are reflected by the two adjusting reflectors and then projected to the imaging concave mirror. The adjusting reflector is a concave mirror or a convex mirror.
Optionally, the number of the directional light sources exceeds two, the number of the reflectors and the number of the adjusting reflectors both correspond to the number of the directional light sources, the number of images switched by the display panel in a time-sharing manner also corresponds to the number of the directional light sources, each directional light beam illuminates a corresponding image on the display panel to become a directional image light beam, and the directional image light beam is reflected by the corresponding reflector, reflected by the corresponding adjusting reflector and projected to the imaging concave mirror.
The utility model provides a many visual angles aerial projection ware again contains two directive property light sources, a display panel and two concave mirrors that form images. The display panel switches images in a time-sharing manner to correspond to the two directional light sources, and the two directional light sources are synchronous with the time-sharing switching of the display panel. The two directional light sources correspond to the two imaging concave mirrors, and each directional light source projects a directional light beam respectively. The two directional light beams respectively illuminate a corresponding time-sharing switching image on the same display panel to form two directional image light beams; each imaging concave mirror reflects the corresponding directional image light beam and projects the directional image light beam to two viewing areas respectively to form two floating projections. The two directional light beams are overlapped areas with the same or high proportion in the irradiation area of the display panel, and the viewing angles of the two viewing areas have larger viewing angle difference.
In addition, the directional imaging device further comprises two adjusting reflectors which are respectively arranged on the light path between the display panel and the two imaging concave mirrors, and the two directional image beams are reflected by the two adjusting reflectors and then projected to the respective imaging concave mirrors. The adjusting reflector is a concave mirror or a convex mirror.
Optionally, the number of the directional light sources exceeds two, the number of the adjusting reflectors and the number of the imaging concave mirrors are both the number of the corresponding directional light sources, the number of the images switched by the display panel in a time-sharing manner also corresponds to the number of the directional light sources, each directional light beam illuminates the corresponding image on the display panel to become a directional image light beam, and the directional image light beam is reflected by the corresponding adjusting reflector and projected to the corresponding imaging concave mirror.
In the multi-view floating projector, the two light paths through which the directional image beams are projected to the two viewing areas further include a windshield.
In the multi-view floating projector, the optical path before the two directional image beams project onto the imaging concave mirror further includes a paraxial mirror.
Optionally, the paraxial mirror is located at a light outlet and is a half-reflecting mirror.
Optionally, the paraxial reflector is located at a light outlet and is a reflective polarizer, a 1/4 wave plate is disposed in the light outlet direction of the display panel, and a 1/4 wave plate is also disposed on a side of the reflective polarizer facing the imaging concave mirror.
Drawings
Fig. 1A, 1B, 1C, and 1D are schematic imaging diagrams of concave mirrors.
Fig. 2 is a schematic diagram of imaging concave mirrors to form a real image.
Fig. 3 is a schematic view of a real image of an aerial projection of a concave mirror for viewing.
FIG. 4 is a schematic diagram of a real image floating projection for an automotive application.
Fig. 5 is a schematic view of a visual angle of a real image of an aerial projection in an automobile.
Fig. 6A and 6B are schematic diagrams of a conventional floating projector for a vehicle.
Fig. 7A and 7B are schematic views of the first embodiment.
Fig. 8A and 8B are schematic views of a second embodiment.
Fig. 9A and 9B are schematic views of a third embodiment.
FIG. 10 is a schematic diagram of the foregoing embodiment with a paraxial mirror.
FIG. 11 is a schematic view of the concave modulating reflector according to the previous embodiment.
FIG. 12 is a schematic view of the convex adjustment mirror according to the foregoing embodiment.
Fig. 13A is a schematic view illustrating the image beam passing through the light exit according to the foregoing embodiment.
FIG. 13B is a schematic view of the aforementioned embodiment with a half mirror light outlet.
FIGS. 14A and 14B are schematic views of the light exit of the reflective polarizer according to the above embodiments.
Fig. 15A is a schematic view of a fourth embodiment.
Fig. 15B is a schematic view of the fifth embodiment.
Fig. 16A is a schematic view of a sixth embodiment.
Fig. 16B, 16C, and 16D are schematic views of a seventh embodiment.
Fig. 17A is a schematic view of an eighth embodiment.
Fig. 17B is a schematic view of a ninth embodiment.
Description of reference numerals: 1-a backlight source; 11,12-a directional light source; 2,21,22-display panel; 3,31,32-imaging concave mirror; 4-a windshield; 51,52-mirror; 6-a paraxial mirror; 61-a half mirror; 62-a reflective polarizer; 65-instrument desk; 71,72-an adjusting mirror; 8-an antireflection film; 91,92-1/4 wave plate; AV1, AV 2-view; AD-difference in visual angle; d1, D2-directive image light beams; DR-real image; DV-virtual image; l1, L2-directional beams; p1, P2-viewers; t-light outlet; v1, V2-projection real image.
Detailed Description
The following embodiments provide a multi-view floating projector that can be viewed by multiple viewers simultaneously, and has clear and bright image and reduced projector size. The multi-view refers to allowing multiple viewers to view images simultaneously, such as two, three, four or more views, each view allowing one or more viewers to view the images within the range of views; for simplicity of description, the dual viewing angles of two viewers are used as examples.
As shown in fig. 7A and 7B, in a first embodiment, a multi-view floating projector uses two directional light sources and two display panels to form two viewing angles correspondingly, and shares the same imaging concave mirror, which is a concave mirror for real-image imaging, and includes:
a first directional light source 11 projecting a first directional light beam L1;
a second directional light source 12 projecting a second directional light beam L2;
a first display panel 21 for displaying a first image, wherein the first directional light beam L1 illuminates the first display panel 21 to form a first directional image light beam D1;
a second display panel 22 for displaying a second image, wherein the second directional light beam L2 illuminates the second display panel 22 to form a second directional image light beam D2;
an imaging concave mirror 3 reflects the first directional image beam D1 and the second directional image beam D2 to a first viewer P1 (i.e., a driving viewing area) and a second viewer P2 (i.e., a passenger viewing area) respectively to form two floating real projection images. The reflection areas of the directional image beams D1 and D2 on the imaging concave mirror 3 are the same or high-proportion of the same overlapping area, for example, the overlapping part of the reflection areas is more than 70%; the viewing angles AV1, AV2 of the two viewing zones have a large viewing angle difference AD between them, e.g. a viewing angle difference AD of more than 30 degrees.
In this embodiment, the directional image beams D1 and D2 are projected from the imaging concave mirror 3 to the optical path between the first viewer P1 and the second viewer P2, and the first directional image beam D1 and the second directional image beam D2 are projected to the windshield 4 and then reflected to the first viewer P1 and the second viewer P2, respectively.
By adjusting the angles of the first directional light source 11 and the second directional light source 12 with the first display panel 21 and the second display panel 22, the same imaging concave mirror 3 can be shared, and the area of the imaging concave mirror 3 can be reduced, for example, compared with the prior art, the area of the imaging concave mirror 3 can be reduced by more than 35%, so that clear and bright floating projection can be viewed at the same time in multiple viewing angles, and the installation space and the cost can be reduced.
In addition, the two directional image light beams D1 and D2 are respectively projected to the first viewer and the second viewer to form real projected images V1 and V2 in the air, and the first display panel 21 and the second display panel 22 can simultaneously display the same or different images, so that the first viewer P1 and the second viewer P2 can simultaneously view the same or different images.
The directional light source may be, for example: the light source is matched with a lens-type collimating lens, the light source is matched with a reflective collimating lens, the light source array is matched with a lens-type collimating lens array, and the light source is matched with a micro-mirror array reflective diffusion sheet, which is not limited thereto.
As shown in fig. 8A and 8B, a multi-view floating projector using two directional light sources and two reflectors to form two viewing angles, and sharing a display panel and an imaging concave mirror, as a concave mirror for real image imaging, includes:
a first directional light source 11 projecting a first directional light beam L1;
a second directional light source 12 projecting a second directional light beam L2;
a display panel 2 displaying a time-division switching image corresponding to the two directional light sources, the two directional light sources being synchronized with the time-division switching of the display panel, the first directional light beam L1 and the second directional light beam L2 respectively forming a first directional image light beam D1 and a second directional image light beam D2 after illuminating the time-division switching image corresponding to the same display panel 2; wherein, the irradiation areas of the two directional light beams on the display panel are the same or high-proportion same overlapping areas, for example, the overlapping part of the irradiation areas is more than 70%;
a first reflecting mirror 51, a second reflecting mirror 52 and an imaging concave mirror 3, wherein the first reflecting mirror 51 and the second reflecting mirror 52 are plane mirrors respectively disposed on the light path between the directional image beams D1 and D2 projected from the display panel 2 to the imaging concave mirror 3. The first directional image beam D1 and the second directional image beam D2 are emitted from the same display panel 2 in directions separated from each other, and the light path direction is changed by the reflection of the first reflector 51 and the second reflector 52, so that the first directional image beam D1 and the second directional image beam D2 converge to the same imaging concave mirror 3, and the imaging concave mirror 3 reflects the first directional image beam D1 and the second directional image beam D2 and respectively projects to a first viewer P1 (driving viewing area) and a second viewer P2 (driving viewing area) to form two floating projection real images. The directional image beams D1 and D2 are completely or mostly overlapped in the reflection area of the imaging concave mirror 3, for example: the overlap of the reflective regions is greater than 70%; the viewing angles AV1, AV2 of the two viewing zones have a large viewing angle difference AD, for example greater than 30 degrees.
In this embodiment, the directional image beams D1 and D2 are projected from the imaging concave mirror 3 to the light path between the first viewer P1 and the second viewer P2, and the windshield 4 is similar to the previous embodiment, and therefore will not be described again.
By adjusting the angles of the first directional light source 11 and the second directional light source 12 and the first reflector 51 and the second reflector 52, the same display panel 2 and the same imaging concave mirror 3 can be shared, the area of the imaging concave mirror 3 is reduced, clear and bright floating projection can be observed at multiple angles, and the installation space and the cost are reduced.
As shown in fig. 9A and 9B, a multi-view floating projector using two directional light sources and two imaging concave mirrors as the concave mirrors for real-image imaging to form two viewing angles correspondingly and share the same display panel, includes:
a first directional light source 11 projecting a first directional light beam L1;
a second directional light source 12 projecting a second directional light beam L2;
a display panel 2 displaying a time-division switching image corresponding to the two directional light sources, the two directional light sources being synchronized with the time-division switching of the display panel, the first directional light beam L1 and the second directional light beam L2 respectively forming a first directional image light beam D1 and a second directional image light beam D2 after illuminating the time-division switching image corresponding to the same display panel 2; wherein, the irradiation areas of the two directional light beams on the display panel are the same or overlap areas with the same high proportion, for example, the overlap part of the irradiation areas is more than 70%;
a first imaging concave mirror 31 is provided, reflecting the first directional image beam D1;
a second imaging concave mirror 32 for reflecting the second directional image beam D2;
the first imaging concave mirror 31 reflects the first directional image beam D1 to a first viewer P1 (viewing area for driving), and the second imaging concave mirror 32 reflects the second directional image beam D2 to a second viewer P2 (viewing area for driving), so as to form two floating projection real images; wherein the viewing angles AV1, AV2 of the two viewing zones have a large viewing angle difference AD, e.g. a viewing angle difference AD of more than 30 degrees.
In this embodiment, the directional image beams D1 and D2 are projected from the first imaging concave mirror 31 and the second imaging concave mirror 32 to the light path between the first viewer P1 and the second viewer P2, and the function of the windshield 4 is similar to that of the previous embodiment, and therefore, the description thereof is omitted.
By adjusting the angles of the first directional light source 11 and the second directional light source 12 with the first concave imaging mirror 31 and the second concave imaging mirror 32, the same display panel 2 can be shared, clear and bright floating projection can be viewed at multiple viewing angles, and the installation space and the cost are reduced.
In addition, the two directional image light beams D1 and D2 are projected to the first viewer P1 and the second viewer P2 respectively to form real projected images V1 and V2 in the air, and the images switched by time division of the display panel 2 may be the same or different; when the same image is displayed, the two directional light beams L1 and L2 may be continuously irradiated without time division switching, or may be synchronized with time division switching of the display panel 2; when different images are displayed, the time-sharing switching of the two directional light beams L1 and L2 and the display panel 2 is synchronized, so that the first viewer P1 and the second viewer P2 can simultaneously view the same or different images. The switching time is shorter than the time for human eyes to stay, for example, 0.1 second, and the images seen by the viewers P1 and P2 will not be interrupted.
As shown in fig. 10, in the above embodiments, the directional image beam D1 is reflected by the paraxial mirror 6 before being projected to the imaging concave mirror 3, and then is projected to the imaging concave mirror 3. The paraxial reflector 6 may be a plane mirror for folding the light path, so that the incident and reflected light paths of the imaging concave mirror 3 are paraxial light paths, which can reduce spherical aberration and improve image quality, and the display panel 2 and other elements on the light path are more flexible in arrangement position.
As shown in fig. 11, in the foregoing embodiment, an adjusting mirror, such as a concave adjusting mirror 71, may be added to the directional image beam D1 path between the display panel 2 and the paraxial mirror 6 to form an enlarged virtual image DV. A floating projection of similar size to that described above can be achieved using a smaller display panel 2 and a shorter object distance. Therefore, the aforementioned adjustable mirror 71 can adjust the size and object distance of the image source.
As shown in fig. 12, in the foregoing embodiment, the adjustable mirror may also be a convex adjustable mirror 72, and forms a reduced virtual image DV to adjust the size and object distance of the image source.
As shown in fig. 13A, in the above embodiments, if the directional image beam D1 is reflected by the imaging concave mirror 3, passes through the light outlet T, and then is projected onto the windshield 4, the light path between the imaging concave mirror 3 and the windshield 4 must be close to the optical axis of the imaging concave mirror 3 and avoid the paraxial reflector 6, so that the application of space is limited.
As shown in fig. 13B, in addition to the above embodiment, the paraxial mirror 6 may be an optical element that is semi-reflective and semi-transmissive, for example, a semi-reflective mirror 61 that is 50% reflective and 50% transmissive, and the semi-reflective mirror 61 may be provided at the light exit T. The directional image beam D1 reflected by the adjusting mirror 71 is projected onto the half mirror 61 for the first time, then partially reflected to the imaging concave mirror 3, and the directional image beam D1 is reflected by the imaging concave mirror 3, projected onto the half mirror 61 again, partially transmitted through the half mirror 61, and then projected onto the windshield 4. Thus, the paraxial light path design can be maintained, the required space can be reduced, external light can be reduced from entering the internal light path from the light outlet T, and the damage of the display panel 2 due to the irradiation of sunlight can be avoided.
The half mirror 61 may be provided with an antireflection film 8 on a side thereof facing the windshield 4 to reduce glare caused by sunlight or external light reflected by the half mirror 61 to the viewer, and to avoid interference with driving and co-driving.
As shown in fig. 14A, another countermeasure is to reduce the entrance of external light into the internal optical path from the light exit T. The transmittance of the polarized component of the light penetrating the glass is higher than that of the S wave, especially when the incident angle is brewster angle, the transmittance of the P wave component is close to 100%, and almost all of the light penetrates, and the transmittance of the S wave component is lower as the incident angle is larger, the paraxial mirror 6 in the above embodiment is changed into a polarizing beam splitter to reflect and transmit the image beam in different polarization states. For example, the reflective polarizer 62 is used to reflect P-polarized light and let S-polarized light pass through, so as to block P-polarized component of sunlight or external light passing through the windshield, and the S-polarized directional image light D1 passing through the light outlet T can be reflected to the first viewer P1 by the windshield 4 with a high ratio. Accordingly, a side of the display panel 2 emitting light and a side of the reflective polarizer 62 facing the imaging concave mirror 3 are respectively disposed with phase retarders, such as 1/4 wave plates 91 and 92, for converting the polarization state of the image light.
The reflective polarizer 62 may be disposed with the anti-reflection film 8 on a side facing the windshield 4, and the function of the anti-reflection film 8 is as described above, and thus is not described in detail.
Fig. 14B is an illustration of a polarization conversion optical path of the countermeasure shown in fig. 14A. The first 1/4 wave plate 91 is close to the light exit side of the display panel 2 and does not shield the incident light path and the reflection light path of the imaging concave mirror 3, and the second 1/4 wave plate 92 is close to the side of the reflective polarizer 62 facing the imaging concave mirror 3 of the light exit T and does not shield the directional image beam D1 projected by the display panel 2 to the adjusting mirror 71. The directional image beam D1 projected from the display panel 2 is S-polarized light, and the first 1/4 wave plate 91 converts the S-polarized light into left-circularly polarized light. The directional image light beam D1 is reflected by the adjustment mirror 71 and converted into right-handed circularly polarized light. The directional image beam D1 passes through the second 1/4 wave plate 92 for the first time, is converted into P-polarized light, is then reflected by the reflective polarizer 62, and is directed to and passes through the second 1/4 wave plate 92 for the second time, and is converted into right-handed circularly polarized light. Then, the directional image beam D1 is reflected by the imaging concave mirror 3, converted into left-handed circularly polarized light, and then emitted to and transmitted through the second 1/4 wave plate 92 for the third time, converted into S-polarized light, and emitted from the paraxial reflective polarizer 62 to the light outlet T.
Fig. 15A is a fourth embodiment combining the first embodiment and fig. 13B. The optical elements of the multi-view floating projector project the real projection images V1 and V2 out of the light outlet T of the same half-reflecting mirror 61 by sharing the same imaging concave mirror 3. Taking the formation of the projected real image V1 as an example, the first directional light beam L1 projected by the first directional light source 11 illuminates the first display panel 21 to form a first directional image light beam D1. The first directional image beam D1 is then projected to the adjusting mirror 71, reflected by the adjusting mirror 71 and projected to the half mirror 61, the half mirror 61 reflects part of the first directional image beam D1 to the imaging concave mirror 3, and is then reflected by the imaging concave mirror 3 to partially penetrate through the half mirror 61 located at the light exit T, projected to the windshield 4, and finally reaches the first viewer P1 (the viewing area of driving), forming a floating projection real image V1. The optical path forming the projected real image V2 is similar to the optical path of the projected real image V1, and the directional image beams D1, D2 are completely overlapped or mostly overlapped in the reflection area of the imaging concave mirror 3.
Fig. 15B combines the first embodiment with the fifth embodiment of fig. 14B. The optical elements of the multi-view floating projector project the real projection images V1 and V2 out of the light outlet T of the same reflective polarizer 62 by sharing the same imaging concave mirror 3. Taking the projection real image V1 as an example, the first directional light beam L1 penetrates through the first display panel 21 and the first 1/4 wave plate 91 to form the first directional image light beam D1. The first directional image beam D1 is reflected by the first adjusting mirror 71, and then passes through the second 1/4 wave plate 92 to be projected to the reflective polarizer 62, and then the first directional image beam D1 is reflected by the reflective polarizer 62, passes through the second 1/4 wave plate 92 for the second time, and is projected to the imaging concave mirror 3 again. The first directional image beam D1 reflected by the imaging concave mirror 3 passes through the second 1/4 wave plate 92 for the third time, exits from the reflective polarizer 62 through the light exit T, is projected onto the windshield 4, and finally reaches the first viewer P1 (the viewing area of driving), so as to form a floating projection real image V1. The optical path forming the projected real image V2 is similar to the optical path of the projected real image V1, and the directional image beams D1, D2 are completely overlapped or mostly overlapped in the reflection area of the imaging concave mirror 3.
Fig. 16A is a sixth embodiment combining the second embodiment with fig. 13B. The optical elements of the multi-view angle floating projector project the projected real images V1 and V2 out of the light outlet T of the same half-reflecting mirror 61 by sharing the same display panel 2 and sharing one imaging concave mirror 3. Taking the formation of the projected real image V1 as an example, the first directional light beam L1 projected by the first directional light source 11 illuminates the display panel 2 to form a first directional image light beam D1. The first directional image light beam D1 is reflected by the first reflecting mirror 51, then projected to the first adjusting reflecting mirror 71, reflected by the adjusting reflecting mirror 71 and projected to the half-reflecting mirror 61, the half-reflecting mirror 61 reflects part of the first directional image light beam D1 to the imaging concave mirror 31, then reflected by the imaging concave mirror 31 and partially penetrates through the half-reflecting mirror 61 located at the light exit T, projected to the windshield 4, and finally reaches the first viewer P1 (the viewing area of driving), forming the aerial projection real image V1. The optical path forming the projected real image V2 is similar to the optical path of the projected real image V1, and the directional light beams L1, L2 completely overlap or almost completely overlap in the irradiation region of the display panel 2. The first directional image beam D1 and the second directional image beam D2 are emitted from the same display panel 2 in directions separated from each other, and the light path direction is changed by the reflection of the first reflector 51 and the second reflector 52, so that the first directional image beam D1 and the second directional image beam D2 converge to the same imaging concave mirror 3.
Fig. 16B is a seventh embodiment combining the second embodiment with fig. 14B. The optical elements of the multi-view floating projector project the real projection images V1 and V2 out of the light outlet T of the same reflective polarizer 62 by sharing the same display panel 2 and the same imaging concave mirror 3. Referring to the schematic optical path diagram of fig. 16C, taking the projection real image V1 as an example, the first directional light beam L1 projected by the first directional light source 11 illuminates the display panel 2 and penetrates through the first 1/4 wave plate to form a first directional image light beam D1. The first directional image beam D1 is reflected by the first reflector 51, then projected to the first adjusting reflector 71, reflected by the adjusting reflector 71 to penetrate through the second 1/4 wave plate 92 to be projected to the reflective polarizer 62, the reflective polarizer 62 reflects the first directional image beam D1 to penetrate through the second 1/4 glass sheet 92, then projected to the imaging concave mirror 31, reflected by the imaging concave mirror 31 to penetrate through the second 1/4 glass sheet 92 and the reflective polarizer 62 located at the light outlet, projected to the windshield 4, and finally reaches the first viewer P1 (the viewing area of the driver), so as to form the floating projection real image V1. The optical path forming the projected real image V2 is similar to the optical path of the projected real image V1, and the directional light beams L1, L2 completely overlap or almost completely overlap in the irradiation area of the display panel 2. The first directional image beam D1 and the second directional image beam D2 are emitted from the same display panel 2 in directions separated from each other, and the light path direction is changed by the reflection of the first reflector 51 and the second reflector 52, so that the first directional image beam D1 and the second directional image beam D2 converge to the same imaging concave mirror 3.
In the embodiment of fig. 16A and 16B, the two directional image beams D1 and D2 are respectively projected to the first viewer P1 and the second viewer P2 to form real projected images V1 and V2 in the air, and the images of the display panel 2 switched in time-sharing manner may be the same or different; when the same image is displayed, the two directional light beams L1 and L2 may be continuously irradiated without being switched in time division, or may be synchronized with the time division switching of the display panel 2; when different images are displayed, the time-sharing switching of the two directional light beams L1 and L2 and the display panel 2 is synchronous, so that the first viewer P1 and the second viewer P2 can simultaneously view the same or different images. The switching time is shorter than the time for human vision persistence, so that the images seen by the first viewer P1 and the second viewer P2 will not be interrupted.
Fig. 16D is an optical path corresponding to the first viewer P1 (the driving viewing area) in fig. 16B, for explaining the polarization state conversion process of the first directional image beam D1. The polarization state of fig. 16D is similar to that shown in fig. 14B, and the difference from the embodiment of fig. 14B is that the S-polarized light projected from the display panel 2 is converted into right-handed circularly polarized light after passing through the first 1/4 wave plate, and then is converted into left-handed circularly polarized light after being reflected by the first reflector 51, and the rest is the same, so the description is omitted.
Fig. 17A is a combination of the third embodiment and the eighth embodiment shown in fig. 13B. The optical elements of the multi-view floating projector project the real projection images V1 and V2 out of the light outlet T of the same half mirror 61 by sharing the same display panel 2 and matching with the plurality of imaging concave mirrors 31 and 32. Taking the formation of the projected real image V1 as an example, the first directional light beam L1 projected by the first directional light source 11 illuminates the display panel 2 to form a first directional image light beam D1. The first directional image beam D1 is then projected to the first adjusting mirror 71, reflected by the adjusting mirror 71 and projected to the half mirror 61, the half mirror 61 reflects part of the first directional image beam D1 to the imaging concave mirror 31, and is then reflected by the imaging concave mirror 31 to partially penetrate through the half mirror 61 at the light exit T, projected to the windshield 4, and finally reaches the first viewer P1 (the viewing area of driving), thereby forming a floating projection real image V1. The optical path forming the projected real image V2 is similar to the optical path of the projected real image V1, and the directional light beams L1, L2 completely overlap or almost completely overlap in the penetration area of the display panel 2.
Fig. 17B shows a ninth embodiment combining the third embodiment with fig. 14B. The optical elements of the multi-view floating projector project the real projection images V1 and V2 out of the light outlet T of the same reflective polarizer 62 by sharing the same display panel 2 and matching with the plurality of imaging concave mirrors 31 and 32. Taking the formation of the projected real image V1 as an example, the first directional light beam L1 projected by the first directional light source 11 illuminates the display panel 2 and penetrates through the first 1/4 wave plate to form a first directional image light beam D1. The first directional image beam D1 is then projected to the first adjusting reflector 71, reflected by the adjusting reflector 71 and projected to the reflective polarizer 62 through the second 1/4 wave plate 92, the reflective polarizer 62 reflects the first directional image beam D1 and projects to the imaging concave mirror 31 after penetrating the second 1/4 glass plate 92, and then is reflected by the imaging concave mirror 31 and projects to the windshield 4 through the second 1/4 glass plate 92 and the reflective polarizer 62 located at the light exit T, and finally reaches the first viewer P1 (the viewing area of the driver), so as to form the aerial projection real image V1. The optical path forming the projected real image V2 is similar to the optical path of the projected real image V1, and the directional light beams L1, L2 completely overlap or almost completely overlap in the irradiation region of the display panel 2.
In the embodiment of fig. 17A and 17B, the two directional image beams D1 and D2 are respectively projected to the first viewer P1 and the second viewer P2 to form real projected images V1 and V2 in the air, and the images of the display panel 2 switched in time-sharing manner may be the same or different; when the same image is displayed, the two directional light beams L1 and L2 may be continuously irradiated without being switched in time division, or may be synchronized with the time division switching of the display panel 2; when different images are displayed, the time-sharing switching of the two directional light beams L1 and L2 and the display panel 2 is synchronous, so that the first viewer P1 and the second viewer P2 can simultaneously view the same or different images. The switching time is shorter than the time for human vision persistence, so that the images seen by the first viewer P1 and the second viewer P2 will not be interrupted.
Claims (20)
1. A multi-view aerial projector, comprising:
at least two directional light sources (11,12), each directional light source (11,12) projecting a directional light beam (L1, L2);
at least two display panels (21,22) with the same number as the at least two directional light sources (11,12), each display panel (21,22) displaying an image, each directional light beam (L1, L2) illuminating the image of the corresponding display panel (21,22) as a directional image light beam (D1, D2); and
an imaging concave mirror (3) for imaging a real image (DR), reflecting the at least two directional image beams (D1, D2) and projecting the reflected beams to at least two viewing areas, respectively, to form at least two aerial projection real images (V1, V2);
wherein the at least two directional image beams (D1, D2) are identical or overlap in an area of more than 70% in the reflection area corresponding to the imaging concave mirror (3).
2. The multi-angle-of-view aerial projector as claimed in claim 1, further comprising a windshield (4) disposed on the optical path of the at least two directional image beams (D1, D2) reflected by the imaging concave mirror (3) and projected between the at least two viewing zones.
3. The multi-angle floating projector as claimed in claim 1, further comprising a paraxial mirror (6) disposed on the light path of the at least two directional image beams (D1, D2) before the image-forming concave mirror (3).
4. The multi-angle of view floating projector as claimed in claim 3, wherein the paraxial mirror (6) is located at a light exit (T) and is a half mirror (61).
5. The multi-view floating projector as claimed in claim 3, wherein the paraxial reflector (6) is located at a light exit (T) and is a reflective polarizer (62), a 1/4 wave plate (91) is disposed in the light exit direction of the at least two display panels (21,22), and another 1/4 wave plate (92) is disposed on one side of the reflective polarizer (62) and faces the imaging concave mirror (3).
6. The multi-view floating projector as claimed in claim 1, further comprising at least two adjusting mirrors (71,72) for adjusting the distance and size of the image source, wherein the number of the adjusting mirrors (71,72) is the same as the number of the directional image beams (D1, D2), each of the adjusting mirrors (71,72) corresponds to one of the directional image beams (D1, D2), and the at least two directional image beams (D1, D2) projected from the at least two display panels (21,22) are first reflected by the at least two adjusting mirrors (71,72) and then projected to the imaging concave mirror (3).
7. A multi-view aerial projector, comprising:
at least two directional light sources (11,12), each directional light source (11,12) projecting a directional light beam (L1, L2);
a display panel (2), the display panel (2) displaying an image, each of the directional light beams (L1, L2) illuminating the image of the display panel (2) as a directional image light beam (D1, D2); and
at least two mirrors (51,52) which are flat mirrors; and
an imaging concave mirror (3) which is a concave mirror for imaging a real image (DR), wherein the at least two reflecting mirrors (51,52) respectively reflect the at least two directional image beams (D1, D2) and project the directional image beams to the imaging concave mirror (3), and the imaging concave mirror (3) reflects the at least two directional image beams (D1, D2) and projects the directional image beams to the at least two viewing areas respectively to form at least two floating projection real images (V1, V2);
wherein the at least two directional image beams (D1, D2) are identical or overlap in an area of more than 70% in the reflection area corresponding to the imaging concave mirror (3).
8. The multi-view floating projector as claimed in claim 7, further comprising a windshield (4) disposed on the optical path of the at least two directional image beams (D1, D2) projected between the at least two viewing areas by being reflected by the imaging concave mirror (3).
9. The multi-angle aerial projector as claimed in claim 7, further comprising a paraxial mirror (6) disposed on the light path before the at least two directional image beams (D1, D2) are reflected by the at least two mirrors (51,52) and projected onto the imaging concave mirror (3).
10. The multi-angle of view floating projector as claimed in claim 9, wherein the paraxial mirror (6) is located at a light exit (T) and is a half mirror (61).
11. The multi-view angle aerial projector as claimed in claim 9, wherein the paraxial reflector (6) is located at a light exit (T) and is a reflective polarizer (62), a 1/4 wave plate (91) is disposed in the light exit direction of the display panel (2), and another 1/4 wave plate (92) is disposed on one side of the reflective polarizer (62) and faces the imaging concave mirror (3).
12. The multi-view aerial projector as claimed in claim 7, further comprising at least two adjusting mirrors (71,72) being concave mirrors or convex mirrors for adjusting the distance and size of the image source, each adjusting mirror (71,72) corresponding to one of the directional image beams (D1, D2), wherein the at least two directional image beams (D1, D2) projected from the display panel (2) are sequentially reflected by the at least two mirrors (51,52), reflected by the at least two adjusting mirrors (71,72), and projected to the imaging concave mirror (3).
13. The multi-view aerial projector as claimed in claim 7, wherein the display panel (2) is time-division switched to display at least two images, the display panel (2) is time-division switched to correspond to the at least two directional light beams (L1, L2), and the at least two directional light sources (11,12) are synchronized with the time-division switching of the at least two display panels (2).
14. A multi-view aerial projector, comprising:
at least two directional light sources (11,12), each directional light source (11,12) projecting a directional light beam (L1, L2);
a display panel (2), the display panel (2) displaying an image, each of the directional light beams (L1, L2) illuminating the image of the display panel (2) as a directional image light beam (D1, D2); and
at least two imaging concave mirrors (31,32) which are concave mirrors for imaging real images (DR), the number of the imaging concave mirrors is the same as that of the directional light sources (11,12), each imaging concave mirror (31,32) respectively reflects the corresponding directional image light beams (D1, D2) and respectively projects the directional image light beams to at least two viewing areas to form at least two floating projection real images (V1, V2);
wherein the at least two directional light beams (L1, L2) are the same or overlap in an area of 70% or more of the irradiation area of the display panel (2).
15. The multi-view floating aerial projector as claimed in claim 14, further comprising a windshield (4) disposed on the optical path of the at least two directional image beams (D1, D2) reflected by the at least two imaging concave mirrors (31,32) and projected between the at least two viewing zones.
16. The multi-view aerial projector according to claim 14, further comprising a paraxial mirror (6) disposed on an optical path before the at least two directional image beams (D1, D2) are projected onto the at least two imaging concave mirrors (31,32).
17. The multi-angle of view floating projector as claimed in claim 16, wherein the paraxial mirror (6) is located at a light exit (T) and is a half mirror (61).
18. The floating projector as claimed in claim 16, wherein the paraxial mirror (6) is located at a light exit (T) and is a reflective polarizer (62), a 1/4 wave plate (91) is disposed in the light exit direction of the display panel (2), and another 1/4 wave plate (92) is disposed on one side of the reflective polarizer (62) and faces the at least two imaging concave mirrors (31,32).
19. The multi-view aerial projector as claimed in claim 16, further comprising at least two adjusting mirrors (71,72) for concave mirrors or convex mirrors for adjusting the distance and size of the image source, wherein the number of the adjusting mirrors (71,72) is the same as the number of the directional image beams (D1, D2), and the at least two directional image beams (D1, D2) projected from the display panel (2) are first reflected by the at least two adjusting mirrors (71,72) and then projected to the corresponding at least two imaging concave mirrors (31,32).
20. The multi-view floating aerial projector as claimed in claim 16, wherein the display panel (2) is time-division switchable to display at least two images, the display panel (2) is time-division switchable to display the at least two images corresponding to the at least two directional light beams (L1, L2), and the at least two directional light sources (11,12) are synchronized with the time-division switching of the at least two display panels (2).
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| CN202221650840.9U CN217821128U (en) | 2022-06-28 | 2022-06-28 | Multi-view floating projector |
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| CN202221650840.9U CN217821128U (en) | 2022-06-28 | 2022-06-28 | Multi-view floating projector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116736551A (en) * | 2023-08-16 | 2023-09-12 | 浙江棱镜全息科技有限公司 | Aerial imaging system and electronic rearview mirror |
| JP7449442B1 (en) | 2022-04-13 | 2024-03-13 | 京セラ株式会社 | Aerial image display device |
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2022
- 2022-06-28 CN CN202221650840.9U patent/CN217821128U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7449442B1 (en) | 2022-04-13 | 2024-03-13 | 京セラ株式会社 | Aerial image display device |
| CN116736551A (en) * | 2023-08-16 | 2023-09-12 | 浙江棱镜全息科技有限公司 | Aerial imaging system and electronic rearview mirror |
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